FOIL AND METHOD FOR PACKAGING A COMPRESSIBLE PRODUCT IN A COMPRESSED STATE AND PACKED COMPRESSIBLE P

专利摘要:
The present invention relates to a method of packaging a compressible product in a compressed state, comprising the step of sealing at least two parts of a polymeric machine direction oriented (MDO) film covering at least a part of the compressible envelops the product in the compressed state, characterized in that the seal has a rupture elongation of about 20% to about 100%, as measured according to ASTM 88 / F88M-09. The present invention also relates to a compressible product packaged in a compressed state in a polymeric MDO film enclosing at least a portion of the compressible product, wherein at least two parts of the MDO film are sealed and characterized in that the seal has an elongation of rupture of about 20% to about 100% as measured by ASTM F88 / F88M-09.
公开号:BE1021958B1
申请号:E2014/0199
申请日:2014-03-24
公开日:2016-01-29
发明作者:Bruno Jacobs；Lesley Hoorens
申请人:BPI Formipac；
IPC主号:

专利说明:

FOIL AND METHOD FOR PACKAGING A COMPRESSED PRODUCT IN A COMPRESSED STATE AND PACKED COMPRESSIVE PRODUCT
AREA
The present invention is in the field of packaging compressible products, such as mineral wool products in a compressed state. The present invention provides a film and a method for packaging a compressible product in a compressed state. The present invention also relates to a packaged compressible product in a compressed state.
BACKGROUND
Compressible products used in the construction industry for thermal and acoustic insulation, such as mineral wool products, can be packaged in various stages in order to reduce the space that such products occupy during storage and transport.
Mineral wool products, such as glass wool and rock wool products, can be packaged in a first stage with a primary wrapping film. A compressible product, such as a mineral wool blanket, can be rolled up in a roll packaging machine together with the primary film and can be closed with an adhesive at the end of the roll-up process so that ultimately a roll of packaged mineral wool is obtained. In this method, a polyolefin film can be used as the primary packaging material. Mineral wool mats are packaged in a different way. A polyolefin film is generally applied to the top surface and the bottom surface of the mat or a stack of mats before it is compressed. A single mineral wool mat or a stack of multiple mats can be compressed and the lower and upper film can be sealed on the front and back to seal the package. The compression of the mineral wool mat or stack of several mineral wool mats is then canceled and the expansion thereof is limited due to the retaining force of the film.
During a secondary packaging stage, several previously packaged rolls of mineral wool or mineral wool mats are compressed and pushed into a first and second foil sheet sealed at one end and the package is closed by sealing the other end. The compression of the multiple rolls of mineral wool or mineral wool mats is eliminated and the expansion thereof is limited due to the retaining force of the film. The resulting package is called a multipack. Sometimes there is a tertiary packaging stage, in which several multipacks are in turn compressed and pushed into a first and second foil sheet sealed at one end and the package is closed by sealing the other end. The compression of the multiple multipacks is canceled and the expansion thereof is limited because of the retaining force of the film.
In the packaging stages, a polyolefin film is typically used where the thickness of the film depends on multiple factors including the compression ratio of the compressible product, such as the mineral wool product. The film must withstand high forces due to the expansion force of the packaged rolls or mats that attempt to return to their original condition. The creep of a film, that is, the tendency of the film to stretch, generally decreases as the thickness of the film increases. From the cost point of view and in order to meet ecological requirements, it is desirable to keep the film as thin as possible.
Conventional non-oriented polyolefin films are used for packaging compressible products. For example, EP 0 908 400 describes a mineral wool product packaged in a compressed state in a polyethylene film comprising high density polyethylene. However, these conventional non-oriented polyolefin films have a high creep, that is, a high tendency to stretch, leading to large growth ratios of the packages. As a result, the compression ratios for the mineral wool are limited and rather thick films should be used to compensate for the poor creep properties.
The latest trend in packaging of mineral wool products is the use of machine-oriented (MDO, Machine Direction Oriented) films that can withstand high expansion forces in the machine direction. These existing MDO films have a low creep in the machine direction, leading to a very high tendency for the packaged product to remain in the compressed state. The existing MDO films have such a low creep that even the thickness of the films can be reduced in comparison with the above-mentioned conventional non-oriented polyolefin films. However, if the existing MDO films are used to package a compressible product in a compressed state, then a disadvantage of these films is their relatively poor heat-sealing properties. For example, seal strips must be well aligned and maintained with great care on a very regular basis to obtain reasonable heat seals with these existing MDO films. Even if the heat seals are produced with adapted seal strips (for example Flexweld seal strips from Qubiqa), these heat seals of the mineral wool packaging made with the existing MDO foils are brittle and form the weak point of the packaged compressible product. Mineral wool packaging made with the existing MDO films often pops open due to the poor sealing behavior of these films.
Crucial in the packaging of compressible products, such as mineral wool products, in a compressed state is the high compression of these products to obtain a package with a limited volume that can be stored and transported in a cost-effective manner, while reducing the expansion forces of the packaged compressible product in the compressed state.
In view of this, there is a need for further and / or improved films and methods for packaging compressible products in a compressed state and / or packaged compressible products that at least partially meet the aforementioned requirements and at least to a certain extent the aforementioned Resolving problems.
SUMMARY
The present inventors have found machine-oriented (MDO) films for packaging compressible products in a compressed state, which allow for storage and transport of the packaged compressible products in an efficient and therefore cost-effective manner and at the same time improved durability with respect to the environment.
Therefore, a first aspect of the present invention relates to a method for packaging a compressible product in a compressed state, which comprises the step of sealing at least two parts of a polymeric MDO film which comprises at least a part of the compressible product in the compressed state, characterized in that the seal has a rupture elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
A further aspect relates to a compressible product packaged in a compressed state in a polymeric MDO film enclosing at least a part of the compressible product, wherein at least two parts of the MDO film are sealed and characterized in that the seal has a failure elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
A further aspect relates to a polymeric MDO film for packaging a compressible product in a compressed state, characterized in that when at least two parts of the MDO film are sealed, the MDO film has a seal with a rupture strain from about 20% to about 100% as measured according to ASTM F88 / F88M-09.
Such an MDO film embodying the principles of the present invention has satisfactory heat sealing properties. The present MDO film allows packaging of a compressible product in a compressed state by sealing at least two parts of the MDO film without the need to regularly align the heat seal strips on a packaging line. Furthermore, a seal produced with the present MDO film can better withstand the expansion forces of the compressed product during storage and / or transport of the packaged product. The present inventors have also found that a seal produced with the present MDO film is more resistant to movements and shocks associated with transporting the packaged product.
The above and further aspects and preferred embodiments of the invention are described in the following paragraphs and in the appended claims. The content of the appended claims is hereby specifically included in this description.
BRIEF DESCRIPTION OF THE FIGURES
Figure 1 shows a graph (heat seal curve) illustrating the seal strength (in N) as a function of the heat seal elongation (in%) of a seal made with an MDO film, illustrating the principles of the present invention (solid line) and of a seal made with an existing mono-oriented film according to the state of the art (dashed line).
DETAILED DESCRIPTION
As used herein, the singular forms "a", "the" and "it" include both singular forms and plural forms unless the context clearly dictates otherwise.
The terms "include", "includes" and "comprising" as used herein are synonymous with "including" or "contain" and "contain" and they include or with an open end and include additional, unnamed members, elements or steps of a process. The terms also include "consisting of" and "consisting essentially of".
The indication of numerical regions by endpoints includes all values and fractions that lie in the respective regions as well as the stated endpoints.
The term "approximately" as used herein when referring to a measurable value, such as a parameter, an amount, a duration, and the like, is intended to include variations of the specified value, such as variations of +/- 10% or less , preferably +/- 5% or less, more preferably +/- 1% or less and even more preferably +/- 0.1% or less of the specified value, insofar as such variations are suitable for the disclosed invention . It should be clear that the value to which the provision "approximately" refers itself is also specifically, and preferably, disclosed.
Although the term "one or more", such as one or more members of a group of members, is clear as such, the term includes, by way of further explanation, a reference to one of the members or to two or more of the members , such as for example> 3,> 4,> 5,> 6 or> 7 etc. of the members up to and including all of these members.
All documents mentioned in the present description are hereby incorporated by reference in their entirety.
Unless otherwise stated, all terms used to disclose the invention, including technical and scientific terms, have the meaning as is generally understood by one of ordinary skill in the art to which this invention belongs. As further guidance, the definitions of the terms may be included to better understand the teaching of the present invention.
As noted, the present inventors have found that if an MDO film is used for packaging a compressible product in a compressed state that gives a seal with a seal rack of about 20% to about 100%, it is possible to package a obtain better resistance to the expansion forces of the compressed product, and shocks and movements to which the packaged products are exposed during transport.
Accordingly, in a first aspect, the invention provides a method for packaging a compressible product in a compressed state, which comprises the step of sealing at least two parts of a polymeric MDO film that contains at least a part of the compressible product in the compressed state, characterized in that the seal has a rupture elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
A related aspect provides the use of the MDO film as defined herein for packaging a compressible product in a compressed state.
The terms "packaging" and "packaging" can be used interchangeably herein and refer to the at least partial wrapping of an item or set of items. The packaging can protect the item or items during storage and / or transport.
In certain embodiments, the method comprises the step of sealing at least two parts of an MDO film that encloses at least a part of a compressible product in a compressed state.
The term "sealing" refers to uniting at least two items together to prevent them from coming apart and / or to prevent something passing between them. The phrase "sealing at least two parts of a polymeric MDO film," as used herein, includes joining at least two parts of a polymeric MDO film to prevent them from coming apart. An advantage of sealing, preferably heat sealing, is that it eliminates the need to use an adhesive to bond the at least two items, such as the at least two parts of the polymeric MDO film.
The term "seal" as used herein refers to the area or line where the at least two parts of the MDO film are joined together to prevent them from coming apart. In certain preferred embodiments, the seal is a permanent seal. In the case that the seal is a permanent seal, the packaged product can be opened by cutting the MDO film as defined herein.
The sealing step can be carried out by any method known in the art that is suitable for sealing MDO films, such as heat sealing, ultrasonic (ultrasonic) sealing or high-frequency sealing.
The term "heat sealing" refers to the method in which at least two items are sealed, for example, sealing at least two parts of a polymeric MDO film, using heat, time and pressure. In the heat sealing method, a constantly heated stamp or seal strip is used to apply heat to a specific contact area or specific contact line to heat seal or weld the items together. The terms "heat sealing" or "welding" can be used interchangeably herein.
The term "ultrasonic (ultrasonic) sealing" refers to the method in which at least two items are sealed, for example, sealing at least two parts of a polymeric MDO film, using high-frequency ultrasonic (ultrasonic) acoustic vibrations. The high-frequency ultrasonic (ultrasonic) acoustic vibrations are applied locally to the at least two items that are held together under pressure so that a fixed weld occurs between the at least two items.
The term "high-frequency sealing" refers to the method in which at least two items are sealed, for example, sealing at least two parts of a polymeric MDO film, by heating with high-frequency electromagnetic waves. The terms "high frequency sealing", "dielectric sealing" or "radiofrequency heat sealing" can be used interchangeably herein.
In order to be able to seal at least two parts of a polymeric MDO film, the MDO film as defined herein, or the outer layer of the MDO film as defined herein, can be made of a thermoplastic material, such as polyethylene or polypropylene.
The term "thermoplastic" generally refers to a polymer that becomes flexible or malleable above a specific temperature and returns to a solid state when it cools.
In certain embodiments, sealing can include heat sealing. In certain embodiments, sealing is heat sealing. In certain embodiments, the parts of the MDO film can be sealed by heat sealing.
In certain embodiments, the parts of the MDO film can be sealed by heat sealing with heat seal strips, hot air or impulse heat sealers.
Heat seal strips generally have heated tools that are kept at a constant temperature (also known as direct contact thermal sealing). As heat seal strips, one or more heated strips are typically used that come into contact with the items to heat the interface and form a bond. The strips can have different configurations and can be covered with a release layer or different smooth underlay materials ("interposers") can be used (i.e. Teflon films) to prevent sticking to the hot tools. Suitable non-limiting examples of heat seal strips include Flexweld (from Qubiqa), Integrity Seal ™ (from International Food Partners Ltd).
Impulse heaters generally have Nichrome heating elements (one or two) placed between a resilient synthetic rubber and a release surface of film or fabric. The heating elements are typically not continuously heated; heat is only generated when a current is running. When the items are placed in the heat sealer, they are held in place by pressure. An electric current heats the heating element for a certain time to reach the required temperature. The clamping plates hold the items in place after the heating has stopped, sometimes with cooling water; and this gives the items the opportunity to fuse before tension can be exerted.
In certain embodiments, the method may include the step of sealing, preferably heat-sealing, at least two parts of an MDO film that encloses at least a part of a compressible product in a compressed state.
The phrase "an MDO film that encloses at least a portion of a compressible product," as used herein, is intended to include an MDO film provided on the external surface of at least a portion of the compressible product. The terms "envelop", "cover", "overlay" or "provided with" may be used interchangeably herein.
In certain embodiments, the at least two parts of an MDO film can be parts of one (sheet of a) MDO film as defined herein. In certain embodiments, the at least two parts of an MDO film can be a part of a first (sheet of a) MDO film as defined herein, and a part of a second (sheet of a) MDO film as defined herein .
In certain embodiments, the portion of the MDO film to be sealed may be located or present at the end of the MDO film. Alternatively, in certain embodiments, the portion of the MDO film to be sealed may be located or present in the MDO film and the MDO film may be cut during or after sealing.
In certain embodiments, the sealing step can be part of a known method for packaging in a compressed state. In certain embodiments, the MDO film as defined herein may be applied after compression (e.g., by enclosing at least a portion of the compressible product with the MDO film as defined herein) and sealed, preferably heat sealed, or the MDO film as defined herein is applied prior to compression (e.g., by enclosing at least a portion of the compressible product with the MDO film as defined herein) and then, after compression, sealed, preferably heat sealed.
In certain embodiments, the method may include the steps of providing a compressible product in a non-compressed or partially compressed state, providing an MDO film as defined herein, encapsulating at least a portion of the compressible product with the MDO film, compressing the compressible product to a compressed state and sealing, preferably heat sealing, at least two parts of the MDO film that encloses at least a portion of the compressible product in the compressed state. As a result, the MDO film as defined herein keeps the product in the compressed state.
In certain embodiments, the method may include the steps of providing a compressible product in a compressed state, providing an MDO film as defined herein, enveloping at least a portion of the compressible product in the compressed state with the MDO film and the sealing, preferably heat sealing, of at least two parts of the MDO film that encloses at least a part of the compressible product in the compressed state. As a result, the MDO film as defined herein keeps the product in the compressed state.
In certain embodiments, if the compressible product, such as a mineral wool product, is a mat (or plate) or a stack of mats (or plates), one MDO film (the sheet thereof) as defined herein may be at least a portion of the top surface and enclosing the bottom surface of the mat (or plate) or stack of mats (or plates), the compressible product can be compressed and the MDO film (the sheet thereof) as defined herein, sealed, preferably heat sealed.
Alternatively, in certain embodiments, if the compressible product, such as a mineral wool product, is a mat (or plate) or a stack of mats (or plates), one MDO film (the sheet thereof) as defined herein (i.e., the upper or first sheet of the MDO film) enveloping at least a portion of the top surface of the mat (or plate) or stack of mats (or plates) and may have another MDO film (the sheet thereof) as defined herein (i.e. say the bottom or second sheet of the MDO film) enclose at least a portion of the bottom surface of the mat (or plate) or stack of mats (or plates), the compressible product can be compressed and the MDO films (the sheets thereof) as defined herein, sealed, preferably heat sealed.
In certain embodiments, a first and second sheet of the MDO film as defined herein may be simultaneously sealed, preferably heat sealed, at one part, such as at a first part, of the first and second sheet of the MDO film as defined herein , and in another portion, such as in a second portion, of the first and second sheets of the MDO film as defined herein. In certain embodiments, a first and second sheet of the MDO film as defined herein may be successively sealed, preferably heat sealed, at one portion, such as at a first portion, of the first and second sheet of the MDO film, as herein and in another part, such as in a second part, of the first and second sheets of the MDO film as defined herein.
In certain embodiments, a first and second sheet of the MDO film as defined herein may be sealed, preferably heat sealed, in one portion, such as in a first portion, of the first and second sheet of the MDO film as defined herein; a compressible product can be compressed in the sealed first and second sheets of the MDO film; and the package can be closed by sealing, preferably heat-sealing, of another part, such as a second part, of the first and second sheet of the MDO film as defined herein. This can happen during a primary packaging stage.
In certain embodiments, a first and second sheet of the MDO film as defined herein can be sealed, preferably heat sealed at one part, such as at a first part, of the first and second sheet of the MDO film as defined herein; multiple packaged products, such as previously packaged rolls of mineral wool or mineral wool mats, can be pushed into the sealed first and second sheets of the MDO film and compressed; and the package can be closed by sealing, preferably heat-sealing, of another part, such as a second part, of the first and second sheet of the MDO film as defined herein. This can happen during a secondary packaging stage.
In certain embodiments, a first and second sheet of the MDO film as defined herein can be sealed, preferably heat sealed at one part, such as at a first part, of the first and second sheet of the MDO film as defined herein; multiple multipacks can be pushed and compressed into the sealed first and second sheets of the MDO film; and the package can be closed by sealing, preferably heat-sealing, of another part, such as a second part, of the first and second sheet of the MDO film as defined herein. This can happen during a tertiary packaging stage.
In certain embodiments, the MDO film as defined herein may be cut, for example during or after sealing. Cutting can be done with a knife.
In certain embodiments, the MDO film as defined herein may be cut during sealing. In certain embodiments, a sealing station may comprise two sealing strips, i.e. a first sealing strip and a second sealing strip, with a knife between the first and second sealing strip. The sealing station can come down and the first sealing strip can seal the second part of a first package and at the same time the second seal strip can seal the first part of the following package. At the same time, the knife located in the middle of the two sealing strips can cut the MDO film as defined herein between the two seals.
In certain embodiments, the seal may have a failure strain of about 25% to about 100%, the seal for example having a failure strain of about 25% to about 90%, about 30% to about 90%, about 35% to about 85%, about 35% to approximately 80%, approximately 35% to approximately 75%, approximately 35% to approximately 70%, approximately 35% to approximately 65%, approximately 35% to approximately 60%, approximately 35% to approximately 55%, approximately 40% up to about 80%, or about 45% to about 75%, as measured according to ASTM F88 / F88M-09 as described herein. Such a failure of the seal from about 25% to about 100% makes it possible to produce a packaged compressible product in a compressed state that can withstand the forces of the compressed product during storage and transport thereof and that is also resistant to shocks and movements to which the packaged product is exposed during transport thereof.
The term "seal strain" or "seal breakdown strain", as used herein, refers to the failure strain in percent, as measured according to ASTM F88 / F88M-09 standard, with tensioning technique A on a tensile tester. A sealed sample with a width of 15 mm is clamped between two clamping jaws at a distance of 50 mm and tested at a speed at which the jaws are removed from each other at 250 mm / min. The tensile bench gives a sealing force curve as a function of the distance covered by the clamping jaws. The manner in which the sample or test strip collapses includes adhesive failure of the seal or adhesive release; cohesive failure of the material; rupture or cracking of the material in the area of the seal or at the edge of the seal; delamination of the surface layer or surface layers of the substrate; stretching of material; and fracture or cracking of material at a site remote from the seal (as shown in Fig. 4 of ASTM F88 / F88M-09). Preferably, a sample for testing the seal rack is made according to ASTM F2029-08, wherein the parts of the MDO film are sealed perpendicular to the machine direction of the film with a heat sealing device with clamping plates with heated strips and the conditions for heat sealing are as set as follows: press-on time 1 s, sealing pressure 100 N, clamping plate width 5 mm and a sealing temperature of 160 ° C.
The rupture elongation of the seal generally refers to the percentage that a sealed film must be stretched between the clamping jaws of a tensile test bench to detect collapse. In order to determine the collapse stretch of the seal, the distance between the clamping jaws is gradually increased until the moment of collapse is determined. The rupture elongation of the seal can be calculated by dividing the elongation of the specimen at the moment of collapse of the specimen (i.e. the distance that the clamping jaws have covered in collapse) by the initial length of the specimen, and by 100 multiply.
The present method is used for packaging a compressible product in a compressed state.
The term "compressible product," as used herein, refers to a product or material that can be compressed by applying balanced inwardly acting (i.e., pushing or compressing) forces at different points on the product or material and that is at least partially can return to its non-compressed state when the application of the balanced inwardly operating (i.e., pushing or compressing) forces is canceled. The terms "product" or "material" can be used interchangeably herein.
The terms "compressible product in a compressed state" or "compressed product" as used herein refer to a product or material in which the size of the product or material is reduced in one or more directions due to the use of balanced inward-acting ( that is, pushing or compressing forces at different points on the product or material. A compressible product in a compressed state will exert balanced outward (i.e., pulling) forces on the material that holds the compressible product in a compressed state. When the material that holds the compressible product in a compressed state is removed, the compressible product will at least partially return to its non-compressed state. For example, a compressible product, such as a mineral wool product, in a compressed state will exert balanced outward (i.e., pulling) forces on the MDO film as defined herein (and thus on the seal made by sealing the MDO foil as defined herein), which keeps the compressible product in a compressed state. When the MDO film as defined herein is removed, the compressible product will at least partially return to its non-compressed state.
In certain embodiments, the compressive forces can only be exerted on the product in one direction (i.e., uniaxial compression), so that they result in a reduction in the length of the product in this direction. The compressive forces can also be applied in several directions; for example, inwards along the edges of a plate or over the entire side surface of a cylinder, so that its surface area is reduced (i.e., biaxial compression), or inwards over the entire surface area of a body, so that its volume is reduced.
In certain embodiments, the length, surface, or volume of a compressible product in a compressed state (e.g., due to the application of inward forces to the product) can be reduced by at least about 1% relative to (i.e., in comparison with one or more respective reference values representing the length, surface or volume of the compressible product in a non-compressed state (e.g. without the application of forces to the product). As an example, the length, surface, or volume of a compressible product in a compressed state (e.g., due to the application of inward forces to the product) may be at least about 5%, at least about 10%, at least about 15% , at least about 20%, at least about 25%, at least about 30%, at least about 35%, at least about 40%, at least about 45%, at least about 50%, at least about 55%, at least at least about 60%, at least about 65%, at least about 70%, at least about 75% or at least about 80% are reduced relative to (i.e., compared to) one or more respective reference values which represent the surface or volume of the compressible product in a non-compressed state (for example, without the application of inward forces to the product). Such a reduction in the length, surface or volume of the compressible product has the advantage that this enables storage and transport of the compressible product in an efficient and therefore cost-effective manner.
A further aspect relates to a compressible product packaged in a compressed state in a polymeric MDO film enclosing at least a part of the compressible product, wherein at least two parts of the MDO film are sealed and characterized in that the seal has a failure elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
The terms "compressible product in a compressed state wrapped in an MDO film", "packaged product" or "packaged compressible product" can be used interchangeably herein.
In certain embodiments, the packaged product may comprise a compressible product in a compressed state and a polymeric MDO film that encloses at least a portion of the compressible product in the compressed state, with at least two parts of the MDO film sealed ( so that the compressible product is kept in a compressed state) and characterized in that the seal has a collapse stretch of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
In certain embodiments, the packaged product may comprise a compressible product in a compressed state and a polymeric MDO film, the MDO film enclosing at least a portion of the compressible product in the compressed state and at least two parts of the MDO foil sealed (so that the compressible product is kept in a compressed state) and characterized in that the seal has a collapse stretch of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
In certain embodiments, if the compressible product, such as a mineral wool product, is a roll, one sheet of the MDO film as defined herein may enclose at least a portion of the cylindrical outer surface of the roll.
In certain embodiments, if the compressible product, such as a mineral wool product, is a mat (or plate) or a stack of mats (or plates), one sheet of the MDO film as defined herein may have at least a portion of the top surface and the cover the bottom surface of the mat (or plate) or stack of mats (or plates). Alternatively, in certain embodiments, if the compressible product, such as a mineral wool product, is a mat (or plate) or a stack of mats (or plates), one sheet of the MDO film as defined herein may be (i.e., the top or bottom) first sheet of the MDO film) at least a portion of the top surface of the mat (or plate) or stack of mats (or plates) and can cover another sheet of the MDO film as defined herein, (i.e. the bottom or second sheet of the MDO film) enclose at least a portion of the bottom surface of the mat (or plate) or stack of mats (or plates).
In certain embodiments, at least two packaged products as defined herein may be further packaged in a compressed state in an MDO film as defined herein. For example, at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven or at least twelve packaged products as defined herein may be placed in a compressed state in an MDO film as defined herein, further packaged.
The term "multipack," as used herein, refers to a package that includes at least two packaged products, such as rolls of mineral wool or mineral wool mats, packaged in a compressed state in an MDO film as defined herein. For example, a multipack comprises at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven or at least twelve packaged products, such as mineral rolls wool or mineral wool mats, packaged in a compressed state in an MDO film as defined herein.
In certain embodiments, at least two multipacks as defined herein may be further packaged in a compressed state in an MDO film as defined herein. For example, at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven or at least twelve multipacks as defined herein may be in a compressed be packaged in an MDO film as defined herein.
The term "package," as used herein, refers to a package that includes at least two multipacks packaged in a compressed state in an MDO film as defined herein. For example, a package includes at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven or at least twelve multipacks packaged in a compressed state in an MDO film as defined herein.
In certain embodiments, if the compressible product is a multipack, one sheet of the MDO film as defined herein may enclose at least a portion of the top surface and the bottom surface of the stack of multipacks. Alternatively, in certain embodiments, if the compressible product is a multipack, one sheet of the MDO film as defined herein (i.e., the top or first sheet of the MDO film) may be at least a portion of the top surface of the stack of multipacks and can enclose another sheet of the MDO film as defined herein (i.e., the bottom or second sheet of the MDO film) at least a portion of the bottom surface of the stack of multipacks.
In certain embodiments, the packaged products, multipacks, or packages, as taught by this invention, can be stacked side by side on a base member. Because the packaged products, multipacks or packages such as this invention teach, have reduced dimensions, they have the advantage that they make it possible to stack the number of packaged products, multipacks or packages that can be stacked side by side on a base member, such as a pallet. optimize. Such optimization is an advantage because it makes it possible to increase the efficiency of internal and external storage and / or transport of the compressible product and thereby reduce the costs of storage and / or transport.
The term "base member" as used herein refers to an organ on which other elements, such as the compressible products packaged in a compressed state, rest or are supported. The basic member is preferably a pallet. Dimensions of pallets are standardized and these are known in the art. For example, a "European" pallet, called a euro pallet, has dimensions of 1200 mm x 800 mm and has the advantage that it fits through standard door openings.
In certain embodiments of the methods, applications, or packaged products, as the present invention teaches, the compressible product can be an insulation product.
The terms "insulation product" or "insulation material" may be used interchangeably herein and refer to a product or material that may reduce or prevent the transfer, flow, or conduction of heat, noise, or electricity.
In certain embodiments of the methods, applications, or packaged products, as the present invention teaches, the insulation product may be building insulation, acoustic insulation, thermal insulation, or electrical insulation.
In certain embodiments of the methods, applications or packaged products, as the present invention teaches, the compressible product, in particular the insulating product, can be a mineral wool product, such as a mineral wool mat or a roll of mineral wool.
The term "mineral wool" generally refers to fibers made from natural or synthetic minerals. Non-limiting examples of synthetic minerals are glass fiber or glass wool; ceramic fibers; and rock wool or rock wool. The terms "mineral wool", "mineral fibers" or "mineral synthetic fibers" can be used interchangeably.
In certain embodiments of the methods, applications or packaged products, as the present invention teaches, the compressible material can be a glass wool product and / or a rock wool product.
A further aspect relates to a polymeric MDO film for packaging a compressible product in a compressed state, characterized in that when at least two parts of the MDO film are sealed, the MDO film provides a seal with a failure strain from about 20% to about 100%, as measured according to ASTM F88 / F88M-09. Thus, one aspect relates to a polymeric MDO film for packaging a compressible product in a compressed state, wherein, when at least two parts of the MDO film are sealed, the seal has a collapse stretch of about 20% to about 100% as measured according to ASTM F88 / F88M-09.
The term "film" as used herein is intended to include any film that is used for packaging applications for compressible products in a compressed state.
The term "machine-oriented film" or "MDO film", as used herein, refers to a film that is machine-oriented.
In certain embodiments of the MDO films, methods, applications or packaged products, as the present invention teaches, the MDO film can only be oriented in the machine direction (i.e., longitudinal direction). In certain embodiments, the MDO film can be oriented in the longitudinal or machine direction and in the transverse direction. In certain preferred embodiments, the MDO film can be oriented in the longitudinal or machine direction. The MDO film is preferably a mono-oriented film. Such MDO films lead to better sealing properties.
In certain embodiments, the MDO film can be mono-oriented.
The term "mono-oriented film" generally refers to a film that is stretched in the machine direction (i.e., longitudinal direction) by means of a Machine Direction Orienter (MDO) unit that may or may not be linked to the extrusion process. Typically, orientation is achieved by guiding the film between two or more draw rollers rotating at different speeds, such as a pair of draw rollers, one roll of which rotates at a higher speed than the other. In certain embodiments, the MDO film can be stretched in two or more steps using two or more stretching units. The oriented film can then be relaxed in a relaxation unit.
In certain embodiments, the MDO film can be made by stretching or orienting a machine-direction film with a draw ratio of about 1: 1.5 to about 1: 4.
As used herein, the term "draw ratio" means the ratio of the total film length before stretching to the total film length after stretching. Thus, a draw ratio of 1: 2 means that the film is stretched 100% of its length before stretching. With regard to the thickness of the film, this means that a film is drawn 120 μιη to 60 µm.
In certain embodiments, the MDO film can be produced by stretching or orienting a film in the machine direction with a draw ratio of about 1: 1.5 to about 1: 3.5, for example with a draw ratio of about 1: 2 to about 1: 3.5, about 1: 2.5 to about 1: 3.5, or about 1: 2.5 to about 1: 3.
The MDO film as taught by the present invention can be produced by a variety of methods. The MDO film as taught by the present invention can be produced by co-extrusion, coating or other laminating methods. The MDO film as taught by the present invention can be produced by cast or blow film methods. After the film has been made, the resulting film can be stretched to obtain an MDO film as defined herein, such as a mono-oriented MDO film.
Preferably, the MDO film as taught by the present invention is made by co-extrusion. Preferably, the MDO film as taught by the present invention is a blow film. Preferably, the MDO film as taught by the present invention is produced by blown film extrusion. It is also possible to produce an MDO film as the present invention teaches by means of cast film extrusion.
A mono-oriented film is typically made as follows. After making the starting film, the film can be stretched uniaxially in the machine direction or oriented to a thinner mono-oriented film. During this orientation in the machine direction, the film, such as a multi-layer film of the blow film line or other film process, can be heated to an orientation temperature. The heating is preferably carried out using a plurality of heated rollers. The heated film can be supplied to a slow draw roll with a pinch roll, which has a similar roll speed as the heated rollers. The film can then reach a fast draw roll, which has a speed that is 1.1 to 10 times higher than that of the slow draw roll, effectively orienting the film on a continuous basis. The mono-oriented film can be tempered by keeping the film at an elevated temperature for a limited time to cause stress relaxation. Finally, the mono-oriented film can be cooled by contacting the film with rollers at ambient temperature and wound onto a spool.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film as defined herein may have a creep through machine direction from about 0.10% to about 0.50% per µm thickness of the film, as measured according to ISO 899-1-2003. In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film as defined herein may have a creep through machine direction from about 0.10% to about 0.50% per µm thickness of the film, as measured according to ISO 899-1-2003 under the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, for 24 hours and at 23 ° C. Such creep through draft allows packaging of a compressible product in a highly compressed state and storage and / or transport of the packaged product with a limited size, diameter or volume in an efficient and cost-effective manner.
Tensile creep generally refers to the change in the distance between the clamping jaws from the initial distance that is caused by the applied load at a given time during a creep test, expressed as a percentage. In order to determine the creep by tension, the increase in the distance between the clamping jaws under load is measured.
The term "creep" as used herein refers to the nominal creep, as measured according to the ISO 899-1: 2003 standard. The sample with a width of 15 mm is attached between two clamping jaws with a distance of 100 mm and loaded with a load of 2300 g for 24 hours at 23 ° C. The creep test consists of measuring the extension of a sample that is subjected to a constant load of 2.3 kg at 23 ° C for 24 hours.
In certain embodiments, the MDO film as defined herein may have a creep through machine direction of about 0.10% to about 0.45% per µm thickness of the film, about 0.10% to about 0.40% per µm thickness of the film, about 0.15% to about 0.40% per µm thickness of the film, or about 0.15% to about 0.35% per µm thickness of the film, as measured according to ISO 899- 1-2003, preferably with the following conditions: sample width of 15 mm, distance between clamping jaws of 100 mm, a load of 2300 g, for 24 hours and at 23 ° C. Such a tensile creep allows packaging of a compressible product in a compressed state so that a packaged product with a limited size, diameter or volume is obtained, which can be efficiently stored and transported.
In certain embodiments of the methods, applications, packaged products, or MDO films, as the present invention teaches, the MDO film as defined herein may have a thickness of about 15 µm to about 100 µm. In certain embodiments, the MDO film as defined herein may have a thickness of from about 15 µm to about 95 µm, about 20 µm to about 95 µm, about 25 µm to about 95 µm, about 30 µm to about 95 µm, about 40 µm to about 90 µm, about 45 µm to about 85 µm, about 50 to about 80 µm, or about 60 µm to about 70 µm. Films with such a thickness are advantageous from an economic and ecological point of view. Fewer starting materials are required to produce such films. Furthermore, such thinner films have the advantage that they make it possible to meet certain ecological requirements. The use of thinner films can also reduce the costs of processing the resulting waste.
The term "thickness" as used herein refers to the thickness of the MDO film after the orientation of the film in the machine direction.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film as defined herein may have a machine direction break elongation of from about 100% to about 300%, as measured by ASTM D882. In certain embodiments, the MDO film as defined herein may have a machine direction break elongation of from about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882. Such breaking elongation provides satisfactory sealing properties to the MDO film. Such a breaking elongation also makes it possible for the MDO film to be sealed without having to constantly adjust and adjust the sealing strips by aligning them.
The term "breaking elongation" or "elongation" as used herein refers to the percentage of elongation until breakage occurs, measured according to the ASTM D882 standard, whereby a strip of the film (in the longitudinal direction) with a width of 15 mm is attached between two clamping jaws that are 50 mm apart and the film is then stretched at a speed of 500 mm / min until the film breaks or tears. At least five strips of the foil must be tested. The average value of the measurements indicates the stretching capacity or the breaking elongation.
In certain embodiments, the MDO film can be produced by stretching or orienting a machine direction film with a draw ratio of about 1: 1.5 to about 1: 4, so that the MDO film has a machine direction break elongation of about 100 % to about 300% as measured according to ASTM D882. The MDO film can be produced, for example, by stretching or orienting a film in the machine direction with a draw ratio of about 1: 1.5 to about 1: 4, about 1: 1.5 to about 1: 3.5, about 1: 2 to about 1: 3.5, about 1: 2.5 to about 1: 3.5, or about 1: 2.5 to about 1: 3, so that the MDO film has a break direction in the machine direction of about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882. Such MDO films provide satisfactory sealing properties when the MDO film is sealed. Such MDO films enable improved sealing of at least two parts of the MDO film without having to constantly adjust the sealing strips by aligning them.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film may be one or more, such as two or more, three or more, four or more, five or more, six or more, seven or more, eight or more, nine or more, ten or more, eleven or more, twelve or more, thirteen or more, or fourteen or more layers. In certain embodiments, the MDO film can be a multi-layer film. Such an MDO film has the advantage of good sealing properties.
In certain embodiments, the MDO film can comprise at least two layers. In certain embodiments, the MDO film may be at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven, at least twelve, at least twelve thirteen or at least fourteen layers. In certain embodiments, the MDO film may comprise at least two layers that are joined together. In certain embodiments, the MDO film may be at least three, at least four, at least five, at least six, at least seven, at least eight, at least nine, at least ten, at least eleven, at least twelve, at least twelve comprise thirteen or at least fourteen layers that are joined together.
The term "polymer" ("polymeric") refers to a film comprising at least one polymer, such as a polyolefin.
In certain embodiments, the MDO film as defined herein may be made essentially of polyolefin. The term "polyolefin" generally refers to homopolymers or copolymers with a methylene bond between monomer units that can be formed by any method known to those skilled in the art. Examples of polyolefins include roughly polymers such as polyethylene and ethylene copolymers with a small amount of a copolymer, such as ethylene-alpha-olefin copolymers (LLDPE), polypropylene, polybutene and other polymeric resins that fall under the classification of "olefin" family, polyethylene (PE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), ultra low density polyethylene (ULDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE ), ultra-high density polyethylene (UHDPE), ethylene / propylene copolymers, polypropylene (PP), propylene / ethylene copolymer, polyisoprene, polybutylene, polybutylene, poly-3-methyl-1-butene, poly-4-methyl-1-pentene or copolymers of ethylene with one or more alpha olefins, such as 1-butene, 1-hexene or 1-octene.
In certain embodiments, the MDO film as defined herein may comprise LLDPE and / or mLLDPE and / or plastomers. LLDPE and / or mLLDPE and / or plastomers make it possible to produce an MDO film with satisfactory sealing properties.
The term "linear low-density polyethylene" or "LLDPE" refers to a substantially linear polymer, with (significant numbers of) short branches, typically made by copolymerization of ethylene with longer chain olefins, such as 1-butene, 1-hexene and 1-octene. LLDPE generally has a density lower than 942 kg / m3, preferably lower than 930 kg / m3.
The term "low density metallocene-type linear polyethylene" or "mLLDPE" refers to LLDPE produced in the presence of a metallocene catalyst.
The term "plastomer" generally refers to a polymeric material in which properties of elastomers and "plastics" are combined. Suitable non-limiting examples of plastomers are ethylene-alpha-olefin copolymers. Commercially available plastomers include Affinity® produced by Dow, Queo® produced by Borealis, Lucene® produced by LG Chem and the like.
In certain embodiments, the MDO film may comprise from about 10% by weight to about 99% by weight of LLDPE and / or mLLDPE and / or plastomers, with weight% based on (i.e. based on) the total weight of the MDO film as taught by the present invention. For example, the MDO film may be from about 15% to about 95%, about 20% to about 90%, about 25% to about 85%, about 30% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers include, wt% being based on (i.e. say is based on the total weight of the MDO film as the present invention teaches.
In certain embodiments of the methods, applications, packaged products, or MDO films, as the present invention teaches, the MDO film as defined herein comprises one or more polymers selected from the group consisting of high density polyethylene (HDPE), polyethylene with medium density (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC). Such polymers have the advantage that they make it possible to increase the rigidity of the MDO film as the present invention teaches.
The term "high density polyethylene" or "HDPE" as used herein refers to polyethylene with a density of about 941 kg / m3 to about 970 kg / m3. Preferably, HDPE has a density of about 945 kg / m3 to about 965 kg / m3. HDPE can be prepared by the polymerization of ethylene monomers and optionally longer chain olefins such as 1-hexene.
In certain embodiments, the HDPE can be high density metallocene-type polyethylene (mHDPE).
The term "high density metallocene-type polyethylene" or "mHDPE" refers to HDPE produced in the presence of a metallocene catalyst.
The term "medium density polyethylene" or "MDPE" refers to polyethylene with a density of about 926 kg / m3 to about 940 kg / m3. MDPE can be prepared by the polymerization of ethylene monomers and optionally longer chain olefins such as 1-hexene.
In certain embodiments, the MDPE may be metallocene-type polyethylene with medium density (mMDPE).
The term "medium density metallocene-type polyethylene" or "mMDPE" refers to MDPE produced in the presence of a metallocene catalyst.
The term "polypropylene" or "PP" refers to a polymer of propylene. Suitable polypropylene includes homopolymer polypropylene, random copolymer polypropylene, and heterophase block copolymer.
The term "cyclic olefin copolymer" or "COC" refers to a copolymer of ethylene with a cyclic monomer (such as norbornene) or to a polymer of cyclic monomers. Cyclic olefin copolymers in which a single type of cyclic monomer is used are also referred to as cyclic olefin polymers (COP).
Cyclic olefin copolymers can be produced by chain copolymerization of cyclic monomers, such as 8,9,10-trinorborn-2-ene (norbornene) or 1,2,3,4,4a, 5,8,8a-octahydro-1,4: 5,8-dimethanaphthalene (tetracyclododecene) with ethylene (such as TOP AS® produced by TOPAS Advanced Polymer, or APEL ™ produced by Mitsui Chemical), or by ring-opening metathesis polymerization of various cyclic monomers followed by hydrogenation (such as ARTON produced by Japan Synthetic Rubber , or Zeonex® and Zeonor® produced by Zeon Chemical).
The term "styrene-butadiene copolymer" or "SBC" refers to a copolymer of styrene and butadiene. A suitable non-limiting example of an SBC is K-Resin® SBC supplied by Chevron Phillips.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film as defined herein may contain from about 1% to about 90% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC, wherein weight% is based on the total weight of the MDO film as taught by the present invention. Thus, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75% % by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 65% by weight, about 30% by weight to about 60% by weight, or about 40% by weight to about 60% by weight % of one or more polymers selected from HDPE, MDPE, PP, COC and SBC, wherein% by weight is based on (i.e. is based on) the total weight of the MDO film as the present invention teaches. For example, the MDO film may be at least about 1% by weight, at least about 2% by weight, at least about 3% by weight, at least about 4% by weight, at least about 5% by weight, at least about 6% by weight, at least about 7% by weight, at least about 8% by weight, at least about 9% by weight, at least about 10% by weight, at least about 15% by weight, at least about 20% by weight %, at least about 25% by weight, or at least about 30% by weight of one or more polymers selected from HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. based on is of the total weight of the MDO film as taught by the present invention.
In certain embodiments, the MDO film as defined herein may comprise from about 1% by weight to about 90% by weight of HDPE and / or mHDPE, where% by weight is based on the total weight of the MDO film. In certain embodiments, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 60% by weight, or about 30% by weight to about 50% by weight of HDPE and / or mHDPE, wherein % by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain embodiments, the MDO film as defined herein may comprise from about 1% by weight to about 90% by weight of MDPE and / or mMDPE, where% by weight is based on the total weight of the MDO film. In certain embodiments, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75%, about 20% to about 70%, about 25% to about 65%, about 30% to about 60%, or about 40% to about 60% by weight of MDPE and / or mMDPE, wherein% by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain embodiments, the MDO film as defined herein comprises from about 1% by weight to about 90% by weight of PP, with% by weight being based on the MDO film. For example, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75 wt%, about 20 wt% to about 70 wt%, about 25 wt% to about 60 wt%, or about 30 wt% to about 50 wt% PP, where wt% is involved on (i.e. based on) the total weight of the MDO film.
In certain embodiments, the MDO film as defined herein comprises from about 1 wt% to about 90 wt% COC, wt% based on (i.e., based on) the total weight of the MDO film. For example, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75 wt%, about 20 wt% to about 70 wt%, about 25 wt% to about 60 wt%, about 30 wt% to about 50 wt% COC, wt% being based on (i.e. based on) the total weight of the MDO film. For example, the MDO film can be from about 1% to about 25%, about 1% to about 20%, about 1% to about 15%, about 1% to about 10 wt%, about 5 wt% to about 25 wt%, or about 10 wt% to about 25 wt% COC, wt% being based on (i.e. based on) the total weight of the MDO film.
In certain embodiments, the MDO film as defined herein comprises from about 1 wt% to about 90 wt% SBC, wt% based on (i.e. based on) the total weight of the MDO film. For example, the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75 wt%, about 20 wt% to about 70 wt%, about 25 wt% to about 60 wt%, about 30 wt% to about 50 wt% SBC, wt% being based on (i.e. based on) the total weight of the MDO film. For example, the MDO film can be from about 1% to about 25%, about 1% to about 20%, about 1% to about 15%, about 1% to about 10% by weight, about 5% by weight to about 25% by weight, or about 10% by weight to about 25% by weight of SBC, where% by weight is based on (i.e. based on) the total weight of the MDO film.
In certain embodiments, the MDO film as defined herein may be low density linear polyethylene (LLDPE) and / or metallocene-type linear low density polyethylene (mLLDPE) and / or plastomers and one or more polymers selected from the group consisting of polyethylene high density (HDPE), medium density polyethylene (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC).
In certain embodiments, the MDO film as defined herein may comprise from about 10% by weight to about 99% by weight of LLDPE and / or mLLDPE and / or plastomers and about 1% by weight to about 90% by weight of one or more polymers selected from include the group consisting of HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. is based on) the total weight of the MDO film. For example, the MDO film as defined herein may be from about 10% by weight to about 99% by weight, about 15% by weight to about 95% by weight, about 20% by weight to about 90% by weight, about 25% by weight % to about 85%, about 30% to about 80%, about 35% to about 70%, or about 40% to about 60% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% %, about 15% to about 75%, about 20% to about 70%, about 25% to about 65%, about 30% to about 60% or from about 40% to about 60% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. is based on the total weight of the MDO film as taught by the present invention.
In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% % by weight, about 15% by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 60% by weight, or about 30% by weight to about 50% by weight % HDPE and / or mHDPE, wherein% by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% % by weight, about 15% by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 65% by weight, about 30% by weight to about 60% by weight. %, or about 40% to about 60% by weight of MDPE and / or mMDPE, wherein% by weight is based on (i.e., is based on) the total weight of the MDO film.
In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% % by weight, about 15% by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 60% by weight, or about 30% by weight to about 50% by weight % PP, wherein% by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% % by weight, about 15% by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 60% by weight or about 30% by weight to about 50% by weight. % COC, where% by weight is based on (i.e. is based on) the total weight of the MDO film. In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and about 1% by weight to about 25% by weight, about 1% by weight to about 20% by weight, about 1% by weight to about 15% by weight, about 1% by weight to about 10% % by weight, about 5% by weight to about 25% by weight, or about 10% by weight to about 25% by weight COC, where% by weight is based on (i.e. based on) the total weight of the MDO film.
In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and from about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80% % by weight, about 15% by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 60% by weight or about 30% by weight to about 50% by weight. % SBC, where% by weight is based on (i.e. is based on) the total weight of the MDO film. In certain preferred embodiments, the MDO film as defined herein may be from about 10% to about 99%, about 15% to about 95%, about 20% to about 90%, about 25% wt% to about 85 wt%, about 30 wt% to about 80 wt%, about 35 wt% to about 70 wt%, or about 40 wt% to about 60 wt% LLDPE and / or mLLDPE and / or plastomers and about 1% by weight to about 25% by weight, about 1% by weight to about 20% by weight, about 1% by weight to about 15% by weight, about 1% by weight to about 10% % by weight, about 5% by weight to about 25% by weight, or about 10% by weight to about 25% by weight of SBC, where% by weight is based on (i.e. based on) the total weight of the MDO film.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film as defined herein may have a machine direction break elongation of from about 100% to about 300%, as measured by ASTM D882 and may comprise one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC. Such an MDO film allows packaging of a compressible product in a highly compressed state for storage and / or transport thereof and the resulting packaged product can withstand expansion forces of the compressed product and is resistant to movements and shocks associated with transport of the packaged product without jumping open.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film can have a machine direction break elongation of about 100% to about 300%, as measured according to ASTM D882 and the MDO film may comprise from about 1% to about 90% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. based on) of) the total weight of the MDO film. For example, the MDO film can have a machine direction break elongation of about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882, and the MDO film can about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% % by weight to about 75% by weight, about 20% by weight to about 70% by weight, about 25% by weight to about 65% by weight, about 30% by weight to about 60% by weight, or about 40% by weight % to about 60% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. based on) the total weight of the MDO film.
In certain embodiments, the MDO film can have a machine direction break elongation of from about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882 and the MDO can film of at least about 1% by weight, at least about 2% by weight, at least about 3% by weight, at least about 4% by weight, at least about 5% by weight, at least about 6% by weight, at least at least about 7%, at least about 8%, at least about 9%, at least about 10%, at least about 15%, at least about 20%, at least about 25 wt%, or at least about 30 wt% of one or more polymers selected from HDPE, MDPE, PP, COC and SBC, with wt% based on (i.e. based on) the total weight of the MDO film as the present invention teaches.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film can be produced by stretching or orienting a film in the machine direction with a draw ratio of about 1: 1.5 up to about 1: 4, so that the MDO film has a machine direction break elongation of about 100% to about 300%, as measured according to ASTM D882 and the MDO film can have one or more polymers selected from the group consisting of HDPE, MDPE , PP, COC and SBC. Such an MDO film has satisfactory heat-sealing properties and allows packaging of a compressible product in a compressed state by sealing at least two parts of the MDO film without having to adjust the heat-sealing strips on a packaging line. Furthermore, a seal made with the present MDO film can withstand expansion forces of the compressed product and is resistant to movements and shocks associated with the transport of the packaged product. At the same time, the present MDO film makes it possible to package a compressible product in a highly compressed state and to store and / or transport the packaged product with a limited size, diameter or volume in an efficient and cost-effective manner.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the MDO film can be produced by stretching or orienting a film in the machine direction with a draw ratio of about 1: 1.5 to about 1: 4, so that the MDO film has a machine direction break elongation of about 100% to about 300%, as measured according to ASTM D882, and the MDO film can have about 1% to about 90% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC, wherein weight% is based on (i.e. is based on) the total weight of the MDO film. For example, the MDO film can be produced by stretching or orienting a film in the machine direction with a stretching ratio of about 1: 1.5 to about 1: 4, about 1: 1.5 to about 1: 3.5, about 1: 2 to about 1: 3.5, about 1: 2.5 to about 1: 3.5, or about 1: 2.5 to about 1: 3, so that the MDO film will break in the machine direction about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882 and the MDO film may have about 1% to about 90%, about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75%, about 20% % to about 70%, about 25% to about 65%, about 30% to about 60%, or about 40% to about 60% by weight of one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC om wherein weight% is based on (i.e. is based on) the total weight of the MDO film.
In certain embodiments, the MDO film can be produced by stretching or orienting a film in the machine direction with a draw ratio of about 1: 1.5 to about 1: 4, about 1: 1.5 to about 1: 3.5 , about 1: 2 to about 1: 3.5, about 1: 2.5 to about 1: 3.5, or about 1: 2.5 to about 1: 3, so that the MDO film has a break direction in the machine direction from about 100% to about 300%, about 100% to about 250%, or about 150% to about 250%, as measured according to ASTM D882 and the MDO film can have at least about 1% by weight, at least about 2 % by weight, at least about 3% by weight, at least about 4% by weight, at least about 5% by weight, at least about 6% by weight, at least about 7% by weight, at least about 8% by weight. %, at least about 9%, at least about 10%, at least about 15%, at least about 20%, at least about 25% or at least about 30% by weight of one or more polymers selected n from HDPE, MDPE, PP, COC and SBC, where% by weight is based on (i.e. is based on) the total weight of the MDO film as the present invention teaches.
In certain embodiments, the MDO film as defined herein may further comprise ethylene-vinyl acetate (EVA), ethylene-methyl acetate (EMA), or ethylene-butyl acetate (EBA). EVA, EMA or EBA make the formation of a multi-layer film possible.
In certain embodiments, the MDO film as defined herein may further comprise one or more additives selected from the group consisting of UV stabilizers (such as hindered amine light stabilizers (HALS) and the like), pigments (such as TiO 2 and other color pigments) and fillers (such as CaCO 3, talc and the like).
In certain embodiments, the MDO film as defined herein may be made from a film with m layers by sticking together (squeezing and laminating) the film in the pinch rollers into a film with 2 times m (i.e. 2xm) layers, wherein m can be two or more, such as a value of m of two, three, four, five, six or seven.
In certain embodiments, the MDO film as defined herein may be made of a film with at least one outer layer and an inner layer, the film sticking together in the pinch rollers so that a film with at least one outer layer, an inner layer, a inner layer and an outer layer.
In certain embodiments, the MDO film as defined herein may be made from a film with at least one outer layer, a core layer, and an inner layer, the film clogging in the pinch rollers so that a film with at least one outer layer, a core layer, an inner layer, an inner layer, a core layer and an outer layer.
In certain embodiments, the MDO film as defined herein may be made of a three-layer film comprising an outer layer, a core layer, and an inner layer, the film sticking together in the pinch rollers to form a six-layer film.
In certain embodiments, the outer layer may comprise LLDPE and / or mLLDPE and / or plastomers. The outer layer makes it possible to seal at least two parts of the MDO film as defined herein.
In certain embodiments, the core layer may comprise one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC. In certain embodiments, the core layer may comprise LLDPE and / or mLLDPE and / or plastomers and one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC. The core layer has the advantage that it provides rigidity to the MDO film as defined herein.
In certain embodiments of the methods, applications, packaged products or MDO films, as the present invention teaches, the core layer of the MDO film as defined herein may be from about 1% to about 90% by weight of one or more polymers. selected from the group consisting of HDPE, MDPE, PP, COC and SBC, wherein% by weight is based on the total weight of the MDO film as taught by the present invention. For example, the core layer of the MDO film as defined herein may be, for example, about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% to about 75%, about 20% to about 70%, about 25% to about 65%, about 30% to about 60%, or about 40% to about 60% by weight of one or more polymers selected from HDPE, MDPE, PP, COC and SBC, wherein% by weight is based on (i.e. based on) the total weight of the MDO film as the present invention teaches.
In certain embodiments, the core layer of the MDO film as defined herein may comprise from about 1% to about 90% by weight of HDPE and / or mHDPE, where% by weight is based on the total weight of the MDO film. In certain embodiments, the core layer of the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% % to about 75%, about 20% to about 70%, about 25% to about 60%, or about 30% to about 50% HDPE and / or mHDPE wherein% by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain embodiments, the core layer of the MDO film as defined herein may comprise from about 1% to about 90% by weight of MDPE and / or mMDPE, where% by weight is based on the total weight of the MDO film. In certain embodiments, the core layer of the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% % to about 75%, about 20% to about 70%, about 25% to about 65%, about 30% to about 60%, or about 40% by weight. % to about 60% by weight of MDPE and / or mMDPE, wherein% by weight is based on (i.e. is based on) the total weight of the MDO film.
In certain embodiments, the core layer of the MDO film as defined herein comprises from about 1 wt% to about 90 wt% PP, with wt% based on the total weight of the MDO foil. For example, the core layer of the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% by weight. % to about 75%, about 20% to about 70%, about 25% to about 60%, or about 30% to about 50% by weight, PP. % is based on (that is, is based on) the total weight of the MDO film.
In certain embodiments, the core layer of the MDO film as defined herein comprises about 1 wt% to about 90 wt% COC, wt% based on (i.e., based on) the total weight of the MDO foil. For example, the core layer of the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% by weight. % to about 75%, about 20% to about 70%, about 25% to about 60%, about 30% to about 50% COC, where% by weight is based on (that is, is based on) the total weight of the MDO film. For example, the core layer of the MDO film can be from about 1 wt% to about 25 wt%, about 1 wt% to about 20 wt%, about 1 wt% to about 15 wt%, about 1 wt. % to about 10% by weight, about 5% by weight to about 25% by weight, or about 10% by weight to about 25% by weight COC, where% by weight is based on (i.e. based on ) the total weight of the MDO film.
In certain embodiments, the core layer of the MDO film as defined herein comprises about 1 wt% to about 90 wt% SBC, wt% based on (i.e. based on) the total weight of the MDO foil. For example, the core layer of the MDO film can be from about 5% to about 90%, about 5% to about 85%, about 10% to about 80%, about 15% by weight. % to about 75% by weight, about 20% to about 70% by weight, about 25% to about 60% or about 30% to about 50% by weight SBC, where% by weight is based on (that is, is based on) the total weight of the MDO film. For example, the core layer of the MDO film can be from about 1 wt% to about 25 wt%, about 1 wt% to about 20 wt%, about 1 wt% to about 15 wt%, about 1 wt. % to about 10% by weight, about 5% by weight to about 25% by weight, or about 10% by weight to about 25% by weight include SBC, where% by weight is based on (i.e. is based on ) the total weight of the MDO film.
In certain embodiments, the inner layer may comprise EVA and / or EBA and / or EMA and / or plastomers. The inner layer allows both inner layers to stick or bond to each other when the extruded blow film sticks together in the pinch rollers.
In certain embodiments, the MDO film as defined herein may comprise additional or further layers between the inner layer and the core layer and / or between the core layer and the outer layer. In certain embodiments, the additional layer may comprise LLDPE and / or mLLDPE and / or plastomers. In certain embodiments, the additional layer may comprise one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC. In certain embodiments, the additional layer may comprise LLDPE and / or mLLDPE and / or plastomers and one or more polymers selected from the group consisting of HDPE, MDPE, PP, COC and SBC.
In certain embodiments, the thickness of the layers (e.g., outer layer, core layer, inner layer, and additional layer or layers) in the MDO film as defined herein may vary. In certain embodiments, the outer layer and the inner layer may be thinner than the core layer. For example, the MDO film as defined herein may have a film structure of 20% / 60% / 20% / 20% / 60% / 20% for the outer layer / core layer / inner layer / inner layer / core layer / outer layer. The layer configuration can depend on the design of the extrusion die and the size of the extruder.
The following list provides an additional explanation of certain aspects and embodiments disclosed in accordance with the present invention: 1. A method of packaging a compressible product in a compressed state, which comprises the step of sealing at least two parts of a polymeric machine-oriented (MDO) film enclosing at least a portion of the compressible product in the compressed state, characterized in that the seal has a collapse stretch of about 20% to about 100%, as measured according to ASTM F88 / F88M-09 . The method of claim 1, wherein the seal has a failure strain of about 25% to about 100%, the seal preferably has a failure strain of about 30% to about 90%, the seal more preferably a failure strain of about 35% has up to about 80%, the seal even more preferably has a failure elongation of about 35% to about 55%, as measured according to ASTM F88 / F88M-09. The method of claim 1 or 2, wherein the sealing comprises heat sealing, wherein the sealing is preferably heat sealing. The method of any one of claims 1 to 3, wherein the compressible product is an insulation product. The method of any one of claims 1 to 4, wherein the compressible product is a mineral wool product, such as a mineral wool mat or a roll of mineral wool. The method of any one of claims 1 to 5, wherein the MDO film has a creep through machine direction pull of from about 0.10% to about 0.50% per μηι thickness of the film, as measured according to ISO 899- 1-2003 with the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, for 24 hours and at 23 ° C. The method of any one of claims 1 to 6, wherein the MDO film has a thickness of about 15 µm to about 100 µl. The method of any one of claims 1 to 7, wherein the MDO film has a machine direction break elongation of about 100% to about 300%, the MDO film preferably having a machine direction break elongation of about 150% to approximately 250% as measured according to ASTM D882. The method of any one of claims 1 to 8, wherein the MDO film is one or more polymers selected from the group consisting of high density polyethylene (HDPE), medium density polyethylene (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC). The method of any one of claims 1 to 9, wherein the MDO film is from about 1% to about 90% by weight of one or more polymers selected from the group consisting of one or more of HDPE, MDPE, PP, COC and SBC, where% by weight is based on the total weight of the MDO film. 11. A compressible product in a compressed state packaged in a polymer machine-oriented (MDO) film enclosing at least a portion of the compressible product, wherein at least two parts of the MDO film are sealed and characterized in that the seal has a failure elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09. The packaged product of claim 11, wherein the seal has a failure strain of about 25% to about 100%, the seal preferably has a failure strain of about 30% to about 90%, the seal more preferably a failure strain of about 35 % to about 80%, the seal even more preferably has a failure elongation of about 35% to about 55%, as measured according to ASTM F88 / F88M-09. The packaged product according to claim 11 or 12, wherein the sealing comprises heat sealing, wherein the sealing is preferably heat sealing. The packaged product according to any of claims 11 to 13, wherein the compressible product is an insulation product. The packaged product according to any of claims 11 to 14, wherein the compressible product is a mineral wool product, such as a mineral wool mat or a roll of mineral wool. The packaged product according to any of claims 11 to 15, wherein the MDO film has a creep through machine direction pull of about 0.10% to about 0.50% per µm thickness of the film, as measured according to ISO 899-1-2003, with the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, for 24 hours and at 23 ° C. The packaged product of any one of claims 11 to 16, wherein the MDO film has a thickness of about 15 µm to about 100 µm. The packaged product of any of claims 11 to 17, wherein the MDO film has a machine direction break elongation from about 100% to about 300%, the MDO film preferably having a machine direction break elongation of about 150% up to about 250% as measured according to ASTM D882. The packaged product according to any of claims 11 to 18, wherein the MDO film is one or more polymers selected from the group consisting of high density polyethylene (HDPE), medium density polyethylene (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC). The packaged product of any one of claims 11 to 19, wherein the MDO film is from about 1% to about 90% by weight of one or more polymers selected from the group consisting of one or more of HDPE, MDPE, PP , COC and SBC, where% by weight is based on the total weight of the MDO film. A polymer machine-oriented (MDO) film for packaging a compressible product in a compressed state, characterized in that the MDO film, when at least two parts of the MDO film are sealed, a seal with a failure strain from about 20% to about 100% as measured according to ASTM F88 / F88M-09. The MDO film of claim 21, wherein the seal has a failure strain of about 25% to about 100%, the seal preferably has a failure strain of about 30% to about 90%, the seal more preferably has a failure strain of about 35% to about 80%, the seal even more preferably has a failure elongation of about 35% to about 55%, as measured according to ASTM F88 / F88M-09. The MDO film according to claim 21 or 22, wherein the sealing comprises heat sealing, wherein the sealing is preferably heat sealing. The MDO film of any of claims 21 to 23, wherein the MDO film has a creep through machine direction pull of about 0.10% to about 0.50% per µm thickness of the film, as measured according to ISO 899-1-2003 with the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, for 24 hours and at 23 ° C. The MDO film of any one of claims 21 to 24, wherein the MDO film has a thickness of about 15 µm to about 100 µm. The MDO film of any of claims 21 to 25, wherein the MDO film has a machine direction break elongation from about 100% to about 300%, the MDO film preferably having a machine direction break elongation of about 150 % to about 250% as measured according to ASTM D882. The MDO film according to any of claims 21 to 26, wherein the MDO film is one or more polymers selected from the group consisting of high density polyethylene (HDPE), medium density polyethylene (MDPE), polypropylene (PP) , cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC). The MDO film of any one of claims 21 to 27, wherein the MDO film is about 1% to about 90% by weight of one or more polymers selected from the group consisting of one or more of HDPE, MDPE, PP, COC and SBC, where% by weight is based on the total weight of the MDO film.
Although preferred embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only.
The above aspects and embodiments are further substantiated with the following non-limiting examples.
EXAMPLES
Example 1: Breaking strain of an MDO film according to an embodiment of the invention
A machine-oriented (MDO) film according to an embodiment of the present invention (i.e., MDO Film A1) was produced by stretching a film with a thickness of 205 µm in a machine direction MDO unit with a draw ratio of 1: 2.9. The MDO Foil A1 was made from a 5-layer co-extruded blown film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: 75% by weight of LLDPE and 25% by weight of cyclic olefin copolymer (COC); layer D: LLDPE; layer E: ethylene-vinyl acetate (EVA). The wt% is based on the total weight of each layer. If no percentages are given, the entire layer is made of the indicated polymer. This co-extruded blow film stuck together in the squeeze rollers of the blow film line because of the tackiness of layer E, so that a 10-layer film (2 times 102.5 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a stretch ratio of 1: 2.9 to a mono-oriented film with a thickness of 70 µm, i.e. MDO Foil A1.
The MDO Foil Al was subjected to a machine direction tensile test on a laboratory tensile tester according to ASTM D882. A strip of the film with a width of 15 mm was attached between two clamping jaws that are 50 mm apart. The film was then stretched at a speed of 500 mm / min until the film broke.
Table 1 shows the results of the measurements of the breaking elongation (in%) and the breaking force (in N) of MDO Foil Al. MDO Foil Al had an average breaking direction in the machine direction of 210% and an average breaking force of 113N.
Table 1: Break elongation (in%) and breaking force (in N) of MDO Foil A1 according to an embodiment of the present invention (n = 6)
SD: standard deviation
The MDO Foil A1 had a breaker that was different from the breaker of existing mono-oriented films that are currently commercially available for packaging compressible product, such as mineral wool products, which typically have a machine direction breaker of about 20 % to about 90%. An example of a prior art film (i.e., Comparative Film B1) was produced by stretching a film with a thickness of 420 µm in a machine direction MDO unit with a draw ratio of 1: 6 . The comparative film B1 was made from a 5-layer co-extruded blown film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: LLDPE; layer D: LLDPE; layer E: EVA. The weight% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. This co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 times 210 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a draw ratio of 1: 6 to a mono-oriented film with a thickness of 70 µm, that is to say a comparing Film B1.
The comparative film BI was subjected to a machine direction tensile test on a laboratory tensile tester according to ASTM D882. A strip of the film with a width of 15 mm was attached between two clamping jaws that are 50 mm apart. The film was then stretched at a speed of 500 mm / min until the film broke.
Table 2 shows the results of the breaking elongation (in%) and the breaking force (in N) of the Foil BI serving as a comparison. The Foil BI serving as a comparison had an average breaking elongation in the machine direction of 58% and an average breaking force of 170N.
Table 2: Breaking strain (in%) and breaking force (in N) of a Foil BI (n = 5) serving as a comparison
SD: standard deviation
Example 2: Seal breakdown strain of an MDO film according to an embodiment of the invention
The failure elongation of a seal of an MDO foil illustrating the principles of the invention (i.e. MDO Foil A2) and of a mono-oriented foil according to the prior art (i.e. comparative Foil B2) was determined of samples made in accordance with ASTM F2029-08 (Standard practices for making heat seals for determination of heat sealability or flexible webs as measured by seal strength).
The MDO Foil A2 was made from a 5-layer co-extruded blown film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: 75% by weight of LLDPE and 25% by weight of cyclic olefin copolymer (COC); layer D: LLDPE; layer E: ethylene-vinyl acetate (EVA). The wt% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. The co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 times 87 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a draw ratio of 1: 2.9 to a mono-oriented film with a thickness of 60 µm.
The comparative MDO film B2 was made of a 5-layer co-extruded blow film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: LLDPE; layer D: LLDPE; layer E: EVA. The wt% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. The co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 times 180 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a draw ratio of 1: 6 to a mono-oriented film with a thickness of 60 µm.
The samples were sealed perpendicular to the machine direction of the film with a heat-sealing device (Brugger HSG-C) with clamping plates with heated strips. The following conditions were used: contact time 1 s, sealing pressure 100 N, clamping plate width 5 mm and a heat seal temperature of 160 ° C. The rupture strain of the seal of the above-made film samples was measured according to ASTM F88 / F88M-09 (with clamping technique A) on a tensile tester. A sealed sample with a width of 15 mm was attached between two clamping jaws at a distance of 50 mm and tested at a speed at which the jaws were moved apart at 250 mm / min. The tensile tester gave the sealing force curve as a function of the heat seal elongation (distance traveled by clamping jaws).
Figure 1 represents a graph of the seal strength (in N) as a function of the heat seal elongation (in%) of a seal made with the MDO film illustrating the principles of the present invention, i.e. MDO Foil A2 (Figure 1, continuous line) and of a seal made with a mono-oriented film according to the state of the art, i.e. comparative Film B2 (Figure 1, dotted line). MDO Foil A2 (Figure 1, solid line) had a thickness of 60 µm. Foil B2 (Figure 1, dotted line) serving as a comparison also had a thickness of 60 µm. MDO Foil A2 had a wide window of heat seal and a heat seal collapse of about 75%, while comparative Foil B2 had a narrow window of heat seal and heat seal collapse of only about 16%, as shown in Figure 1. As a result, the heat seal of MDO Foil A2 had a much greater capacity for absorbing forces of the compressed products and also of shocks and movements during transport compared to the heat seal of the comparing Foil B2.
Example 3: MDO films according to embodiments of the present invention
The advantages of the present invention are further illustrated by a comparison of different films used for packaging compressible products such as mineral wool products in a compressed state.
The five different films were subjected to a machine direction tensile test on a laboratory tensile tester according to ASTM D882. A strip of the film with a width of 15 mm was attached between two clamping jaws, which are 50 mm apart. The film was then stretched at a speed of 500 mm / min until the film broke.
The five different films were subjected to a heat seal test in which the heat seal failure was measured. The samples were made according to ASTM F2029-08 under the following conditions: pressure time 1 s, sealing pressure 100 N, clamping plate width 5 mm and a sealing temperature of 160 ° C. The heat seal failure of the film samples made as described above was measured according to ASTM F88 / F88M-09 (with clamping technique A) on a tensile tester. A sealed sample with a width of 15 mm was attached between two clamping jaws at a distance of 50 mm and tested at a speed at which the clamping jaws are moved apart at 250 mm / min. The tensile bench gave a seal of the sealing force as a function of the heat seal elongation (distance covered by the jaws).
The five different films were subjected to a creep test (23 ° C / 15 mm sample width / 2300 g / 100 mm distance between the clamping jaws / 24 hours) in the machine direction according to ISO 899-1-2003.
The five different films were subjected to a practical packaging test at the tertiary packaging stage on machines (Seelen line from Qubiqa) with adapted heat seal strips (Flexweld seal strips from Qubiqa). Three multipacks (each containing four rolls of mineral wool (glass wool)) were compressed with a force of 2100 N (i.e., large compression).
Film A: a conventional (non-oriented) polyolefin blowing film from producer A with a thickness of 110 µm. The usual polyethylene blow film was a single-layer HDPE blow film.
Film B: a mono-oriented film that is currently commercially available from producer B with a thickness of 70 µm.
Film C: a mono-oriented film that is currently commercially available with a thickness of 70 µm. This comparative mono-oriented film was made from a 5-layer co-extruded blow film containing the following polymers: layer A: 75% by weight linear low density polyethylene (LLDPE) and 25% by weight plastomer; layer B: LLDPE; layer C: LLDPE; layer D: LLDPE; layer E: ethylene-vinyl acetate (EVA). The wt% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. The 5-layer co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 x 210 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented with a stretch ratio of 1: 6 to a mono-oriented film with a thickness of 70 µm, i.e., Film C.
Film D: a machine-oriented (MDO) film according to an embodiment of the invention with a thickness of 70 µm. This MDO film was made from a 5-layer co-extruded blow film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: 65% by weight of LLDPE and 35% by weight of COC; layer D: LLDPE; layer E: EVA. The wt% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. The co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 x 105 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a stretch ratio of 1: 3 to a mono-oriented film with a thickness of 70 µm, i.e. Film D.
Film E: a machine-oriented (MDO) film according to an embodiment of the invention with a thickness of 60 µm. This MDO film is a 5-layer co-extruded blow film containing the following polymers: layer A: 75% by weight of LLDPE and 25% by weight of plastomer; layer B: LLDPE; layer C: 65% by weight of LLDPE and 35% by weight of COC; layer D: LLDPE; layer E: EVA. The wt% is based on the total weight of each layer. If no percentage is given, the entire layer is made of the indicated polymer. The co-extruded blown film stuck together in the pinch rollers of the blown film line because of the tackiness of layer E, so that a 10-layer film (2 x 90 µm) was formed. The resulting film was then introduced into the MDO unit where it was oriented in the machine direction with a stretch ratio of 1: 3 to a mono-oriented film of 60 µm, i.e. Film E.
The breaking elongation (under tensile load), the heat seal's collapsing elongation and the machine-directional creep (MD) were measured. A practical packaging test was carried out with the five different films A, B, C, D and E on machines (Seelen line from Qubiqa) with adapted heat seal strips (Flexweld seal strips). The results are shown in Table 3.
Table 3: Stretch ratio, thickness, breaking elongation, heat seal rupture elongation, creep through machine direction (MD) pull and packaging test results of five films illustrating the present invention
The usual non-oriented polyolefin Foil A performed poorly with respect to creep (i.e., the tendency to stretch) and thickness. Foil A had a high creep, that is, a high tendency to stretch, leading to too large expansion ratios of the packages. As a result, the compression ratios for the mineral wool were limited.
The comparative mono-oriented foils B and C with heat seal failure of 15% and 16% respectively had good creep properties, but performed poorly on heat sealing when mineral wool was packaged in a compressed state. Almost all packages jumped open at the seal.
The MDO Foil D according to an embodiment of the present invention, stretched in the machine direction with a stretch ratio of 1: 3 and with a break elongation in the machine direction between 150 and 250%, had a heat seal failure of approximately 45% (Table 3, Foil D). This heat seal collapse was considerably higher than the heat seal collapse of the comparative mono-oriented films, i.e. a heat seal collapse of 15% and 16% for Foil B and Foil C, respectively (Table 3, Foil B and C). As a result, the MDO Foil D according to an embodiment of the invention gave a very satisfactory sealing performance in a field test without any open packages (Table 3, Foil D) compared to the poor result of the mono-oriented foils serving as comparison (Table 3, Foil B and C). Furthermore, although the creep by tensile of the MDO Foil D was higher than the creep by tensile of the comparative mono-oriented Foils B and C, the MDO Foil D had a sufficiently low creep by tensile to the expansion forces of the packages of compressed mineral wool satisfactorily.
Even the thinner MDO Foil E according to an embodiment of the present invention performed excellent during field tests. The MDO Foil E also had a sufficiently low creep by tension to withstand the expansion forces of the packs of compressed mineral wool (Table 3, Foil E).
It can therefore be concluded that the MDO films illustrating the principles of the present invention had improved sealing behavior on machines for packaging compressible products, such as mineral wool products. With the MDO films illustrating the principles of the invention, it was no longer necessary to regularly align the heat seal strips on a mineral wool packaging line. Moreover, the present MDO films were perfectly sealed, even on packaging lines that until now were unable to seal mono-oriented films according to the prior art. The present MDO films have offered an advantageous solution for a cost-effective method of storing and transporting compressible products, such as mineral wool products, in a compressed state. Also with regard to cost saving and environmental sustainability, the MDO films illustrating the principles of the present invention were very beneficial because they can be made with a reduced thickness.

权利要求:
Claims (19)
[1]
CONCLUSIONS
A method for packaging a compressible product in a compressed state, which comprises the step of sealing at least two parts of a polymeric machine-oriented (MDO) film comprising at least a portion of the compressible product in the compressed state encapsulated, characterized in that the seal has a rupture elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
[2]
The method of claim 1, wherein the seal has a failure strain of about 25% to about 100%, the seal preferably has a failure strain of about 30% to about 90%, the seal more preferably has a failure strain of about 35% to approximately 80% as measured according to ASTM F88 / F88M-09.
[3]
Method according to claim 1 or 2, wherein the sealing comprises heat sealing, wherein the sealing is preferably heat sealing.
[4]
The method of any one of claims 1 to 3, wherein the compressible product is an insulation product.
[5]
The method of any one of claims 1 to 4, wherein the compressible product is a mineral wool product, such as a mineral wool mat or a roll of mineral wool.
[6]
The method of any one of claims 1 to 5, wherein the MDO film has a creep through machine direction pull of about 0.10% to about 0.50% per µm thickness of the film, as measured according to ISO 899- 1-2003 with the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, 24 hours and at 23 ° C.
[7]
The method of any one of claims 1 to 6, wherein the MDO film has a thickness of about 15 µm to about 100 µm.
[8]
The method of any one of claims 1 to 7, wherein the MDO film has a machine direction break elongation from about 100% to about 300%, the MDO film preferably having a machine direction break elongation from about 150% to about 150% 250%, as measured according to ASTM D882.
[9]
The method of any one of claims 1 to 8, wherein the MDO film is one or more polymers selected from the group consisting of high density polyethylene (HDPE), medium density polyethylene (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC).
[10]
The method of any one of claims 1 to 9, wherein the MDO film is from about 1% to about 90% by weight of one or more polymers selected from the group consisting of one or more of HDPE, MDPE, PP, COC and SBC, wherein% by weight is based on the total weight of the MDO film.
[11]
11. Compressible product in a compressed state packaged in a polymer machine-oriented (MDO) film enclosing at least part of the compressible product, wherein at least two parts of the MDO film are sealed and characterized in that the seal has a failure elongation of about 20% to about 100%, as measured according to ASTM F88 / F88M-09.
[12]
Polymer machine-oriented (MDO) film for packaging a compressible product in a compressed state, characterized in that the MDO film, when at least two parts of the MDO film are sealed, a seal with a rupture strain from about 20% to about 100% as measured according to ASTM F88 / F88M-09.
[13]
A packaged product according to claim 11, or MDO film according to claim 12, wherein the seal has a failure strain of about 25% to about 100%, the seal preferably has a failure strain of about 30% to about 90%, the seal having more preferably has a failure elongation of about 35% to about 80%, as measured according to ASTM F88 / F88M-09.
[14]
A packaged product according to claim 11 or 13, or MDO film according to claim 12 or 13, wherein the sealing comprises heat sealing, wherein the sealing is preferably heat sealing.
[15]
A packaged product according to any of claims 11, 13 or 14, or MDO film according to any of claims 12 to 14, wherein the MDO film has a creep by machine pull from about 0.10% to about 0, 50% per µm thickness of the film, as measured according to ISO 899-1-2003 with the following conditions: sample width of 15 mm, distance between the clamping jaws of 100 mm, a load of 2300 g, 24 hours and at 23 ° C .
[16]
A packaged product according to any of claims 11 or 13 to 15, or MDO film according to any of claims 12 to 15, wherein the MDO film has a thickness of about 15 µm to about 100 µm.
[17]
A packaged product according to any of claims 11 or 13 to 16, or MDO film according to any of claims 12 to 16, wherein the MDO film has a breaking direction in the machine direction of about 100% to about 300%, the MDO film preferably has a machine direction break elongation of about 150% to about 250%, as measured according to ASTM D882.
[18]
A packaged product according to any of claims 11 or 13 to 17, or MDO film according to any of claims 12 to 17, wherein the MDO film is one or more polymers selected from the group consisting of high density polyethylene (HDPE) , medium density polyethylene (MDPE), polypropylene (PP), cyclic olefin copolymer (COC) and styrene-butadiene copolymer (SBC).
[19]
A packaged product according to any of claims 11 or 13 to 18, or MDO film according to any of claims 12 to 18, wherein the MDO film is selected from about 1% to about 90% by weight of one or more polymers. from the group consisting of HDPE, MDPE, PP, COC and SBC, with% by weight based on the total weight of the MDO film.

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引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

US20030211298A1|1999-12-30|2003-11-13|Migliorini Robert A.|Multi-layer oriented polypropylene films with modified core|

---

US20020012807A1|2000-03-07|2002-01-31|Kurian Joseph V.|Low temperature heat-sealable polyester film and method for producing the same|

---

US20130294821A1|2011-02-04|2013-11-07|Maschinenfabrik Gerd Mosca Ag|Method for welding renewable raw materials|

---

US4384024A|1981-03-19|1983-05-17|Imperial Chemical Industries Limited|Composite heat-sealable films|

---

EP0908400A1|1997-10-13|1999-04-14|Rockwool International A/S|Packaged mineral wool products|DE16819959T1|2015-12-29|2018-12-27|Danapak Flexibles A/S|Method of providing a chemical resistant film|

---

US11059614B2|2016-08-29|2021-07-13|Johns Manville|Insulation packaging system|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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EP14155573|2014-02-18|

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EP141555730|2014-02-18|

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