packaging material for a packaging container for liquid or semi-liquid food, packaging container, an

专利摘要:
Laminated packaging materials comprising foamed cellulose, their use in the manufacture of packaging containers, for use in packaging food products are described here.
公开号:BR112016027609B1
申请号:R112016027609-4
申请日:2015-05-28
公开日:2021-02-23
发明作者:Ulf NYMAN；Mats Aldén；Nils Toft
申请人:Tetra Laval Holdings & Finance S.A；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] Packaging materials for packaging containers for liquid or semi-liquid foods, their production method and the use thereof are described here. FUNDAMENTALS
[002] Disposable packaging containers for liquid foods are often produced from a packaging material based on cardboard or paperboard. One of these commonly occurring packaging containers is marketed under the trademark Tetra Brik® Aseptic and is mainly used for aseptic packaging of liquid foods such as milk, fruit juices, etc., marketed and sold for long-term storage in the environment. The packaging material in this known packaging container is typically a laminate comprising a volume layer of paper or cardboard and liquid-tight outer layers of thermoplastics. In order to make the packaging container gas-tight, in particular oxygen gas, for example for the purpose of aseptic packaging such as packaging of milk or fruit juices, the laminating of the packaging material in these packaging containers normally comprises at least at least one additional layer, providing gas barrier properties, most commonly an aluminum foil.
[003] Inside the laminate, that is, the side intended to face the food contents filled with a container produced from the laminate, there is an inner layer, applied over the aluminum foil, the inner layer of which can be composed of one or more partial layers, comprising heat-curable adhesive polymers and / or heat-curable polyolefins. Also on the outer side of the paper or cardboard volume layer, there is a more external heat-curable polymer layer (decoration layer). The heat-curable polymer layers are often based on low density polyethylene or mixtures thereof.
[004] Packaging containers are generally produced by means of high-speed packaging machines of the type that continuously form, fill and seal packages from a continuous sheet of packaging material, for example, aseptic packaging machines of Tetra Brik type ®. The packaging containers can thus be produced by so-called forming-filling-sealing technology, basically including the continuous formation of a continuous sheet in a tube of the laminated packaging material by means of a filling machine that forms, fills and seals the continuous sheet. in packaging. According to another method, the packages are made one by one from prefabricated matrices of packaging material, for example, on Tetra Rex® filling machines, thus providing so-called long-life packages, or other packages based on in matrix.
[005] One aspect of the Tetra Brik® type continuous packaging method is, as mentioned above, the possibility of high speed packaging, which has a considerable impact on cost efficiency. Typically, many thousands of packages can be prepared per hour. For example, the speed of Tetra Pak® A3 can manufacture around 15,000 packages per hour (family size packaging containers 0.9 liters and above) and about 24,000 packaging containers per hour (portion packages).
[006] There have been attempts to modify a cardboard laminate by replacing the cardboard volume layer with a polymer foam, as for example, described in WO00 / 30846. Such attempts, however, did not come to practical products, because cost-effective polymer foams normally deteriorate and collapse when exposed to high temperature and pressure during the conversion of materials to a laminated material. This is a particular problem during polymer melt extrusion lamination operations, where the polymeric foams collapse by the heat of the molten polymer and the pressure in the lamination gap, but also during the lamination steps, where the layers having pre-coated surfaces of a thermoplastic polymer or adhesive, they are placed to adhere to each other through the simultaneous application of heat and pressure to an interstitial of the heated roll, i.e., so-called rotational heat pressure lamination.
[007] US Patent No. 5071704 relates to a controlled deliberation device for releasing vapors or liquids, being a multilayer laminate comprising a reservoir layer that incorporates and active compound, such as a perfume or an insect repellent. The laminate further includes a diffusion rate limiting layer, an impermeable layer, an adhesive layer and a decorative layer.
[008] US patent No. 4286016 relates to a whitening package that includes a foamed material, comprising a porous pouch containing a dry granular hypochlorite generating agent for the release of the bleach into the aqueous medium of an automatic washing machine for several minutes after the start of the wash cycle. GOALS
[009] One objective is to manufacture a laminated packaging material and packaging containers for liquid and semi-liquid foods manufactured from the packaging material, which reduces or eliminates the problem described above of the prior art.
[0010] It is an additional objective to produce such a laminate of packaging material, in which a layer of foamed volume resists lamination by heat pressure without losing its original thickness during lamination operations and, thus, provided a thickness of adequate volume in the final laminate with a low density of the volume material.
[0011] It is still an additional objective to produce such a laminate of packaging material that is optimized to have both such thickness and volume density retained, on the one hand, as well as an appropriate mechanical durability such as, for example, delamination force.
[0012] Another objective is to design a lighter and more cost-effective packaging material structure, with a printing surface, gas barrier properties and mechanical durability. DETAILED DESCRIPTION OF METHODS
[0013] Hereinafter, aspects related to a laminated packaging material are described, which are discussed and exemplified in detail here. Some aspects are related to a method of preparing the packaging material. In addition, some aspects are related to the use of packaging material to provide suitable packaging containers for liquid and semi-liquid food products. The packaging material is in one aspect used in a filling machine for liquid or semi-liquid food products, for example, the forming-filling-sealing type, such as a Tetra Pak® A3 filling machine, for the manufacture of packaging containers aseptic. In some respects, packaging containers are made from a continuous sheet of packaging material fed by roll. In some respects, packaging containers are manufactured from a matrix piece of packaging material.
[0014] The packaging material provided in the embodiments, examples and aspects referred to herein refers to a packaging material comprising a volume layer with a density less than 700 kg / m3.
[0015] The following terms and definitions used herein should be given the definition here below.
[0016] A "polyolefin" or "polyalkene" is a polymer produced from a simple olefin of formula C2H2n as a monomer.
[0017] A "polyethylene" is a polyolefin produced by polymerization of the ethylene monomer.
[0018] A "copolymer" or "heteropolymer" is a polymer of two or more monomeric species.
[0019] A "high density polyethylene" or "HDPE" is an ethylene polymer having a density greater than 0.941 g / cm3.
[0020] A "low density polyethylene" or "LDPE" is a polyethylene homopolymer with a density of 0.910 to 0.935 g / cm3. LDPE is also known as branched or heterogeneously branched polyethylene due to the relatively large number of long chain branches that extend from the main structure of the polymer. LDPE has been commercially manufactured since the 1930s and is well known in the art.
[0021] A "linear low density polyethylene" or "LLDPE" refers to a polyethylene copolymer with a density of 0.89 g / cm3. LLDPE is linear and does not substantially contain long chain branching, and generally has a narrower molecular weight distribution than conventional LDPE. The traditional “linear low density polyethylene” (LLDPE) can be produced with conventional Ziegler-Natta catalysts. LLDPE has also been manufactured commercially for a long time (since the 1950s by reactors in solution, and since the 1980s by reactors in gas phase) and is also well known in the art.
[0022] A “mLLDPE” is a low density linear polyethylene produced by metallocene catalysts in gas phase reactors and / or with metallocene catalysts in slurry reactors and / or with any of the haftocene catalysts in solution reactors . MLLDPE polymers are well known in the art of packaging technology.
[0023] A "matrix" means a prefabricated tubular sheet, unfolded flat, of a packaging material. An example of a matrix packaging material comprises a volume layer and liquid-tight plastic liners on each side of the volume layer. The die is used to manufacture sealed packaging containers by lifting the die to an open tubular sleeve which is transversely sealed at one end before filling and transverse sealing of the open end.
[0024] A "thickness" referring to the packaging material, a packaging container or layers thereof, unless otherwise defined, determined by microscopy, for example, by a suitable microscope such as those marketed under the name Olympus , for example, BX51.
[0025] "Liquid or semi-liquid food" generally refers to food products with a fluent content that can optionally contain pieces of food. Dairy and milk, soy, rice, grains and seed drinks, juice, nectar, distilled drinks, energy drinks, sports drinks, coffee or tea drinks, coconut water, tea drinks, wine, soups, jalapeno peppers, tomatoes, sauce (such as pasta sauce), beans and olive oil are some non-limiting examples of contemplated food products.
[0026] "Aseptic" in relation to a packaging material and packaging container refers to conditions in which microorganisms are eliminated, inactivated or killed. Examples of microorganisms are bacteria and spores. Usually an aseptic process is used when a product is aseptically packed in a packaging container.
[0027] The term "heat seal" refers to the process of welding from one surface of a thermoplastic material to another thermoplastic surface. A heat-resistant material must, under the appropriate conditions, such as applying sufficient heat and pressure, be able to generate a seal when pressed against and in contact with another suitable thermoplastic material. Adequate heating can be achieved by induction heating or heating by ultrasound or by other conventional means of heating by contact or convection, for example, hot air.
[0028] The term "weakening" means a weakening of the material such as a crease, perforation or the like.
[0029] The term "attenuation" means a portion of the packaging material comprising at least one, but not all, layers of the packaging material. The attenuation can, for example, be an opening, crack or recess, as long as it is covered by at least one of the layers of the packaging material. As an example, the attenuation is a continuation of the barrier layer and the innermost layer of heat seal of the packaging material, in which the volume layer was cut to form the limits of the attenuation, in order to facilitate the opening of the packaging container. .
[0030] Laminated packaging materials are obtained by various methods for laminating layers together, such as extrusion lamination, wet or dry adhesive lamination, heat pressure lamination and can also include various coating methods. Although the particular lamination technique is not crucial to achieve the benefits of aspects and embodiments described here, extrusion lamination is an example that can be used appropriately to produce laminated packaging materials, in particular carton-based packaging. used for foods such as liquid and semi-liquid foods.
[0031] According to aspects and embodiments described here, a packaging container is provided having a long useful life, the shelf life is not less than 3, 6, 8, 9, 10, 11, 12, 13, 14, 15 months. Of course, a long service life is preferred. Generally, a service life of at least 12 months is required, which can vary different preferences. In one aspect, a packaging container made from the packaging material described here has a shelf life of 12 months.
[0032] In particular, such a laminated packaging material comprises a volume layer, comprising a layer of a fibrous cellulose formed by foam, hereinafter called foamy cellulose. Foamed cellulose is, therefore, a fibrous continuous sheet layer, with adjustable density, which can be manufactured by a foaming process. The volume layer is arranged to provide the most efficient contribution to the flexural stiffness of the laminate. The volume layer used here has a grammage of surface weight of at least 20 g / m2. In some embodiments the grammage is between 20-440 g / m2. The weight is, for example, dependent on the requirements given by different types of packaging. The grammage of the volume layer is evaluated according to the ISO 536 standard. The grammage of the surface weight expresses the weight per unit area and is measured in g / m2. The volume layer is normally between 80-1100 μm thick, and is appropriately selected in order to obtain the desired stiffness suitable for the type of packaging container and the desired food product. The thickness of the volume layer can be assessed by microscopy as discussed below. Foamy cellulose provides at least 20%, such as at least 25%, such as at least 30%, such as at least 40% of the thickness of the volume layer. The percentages can be determined by examining the cross section of the packaging material under a microscope.
[0033] The volume layer can, according to some aspects and embodiments, be treated on the surface or coated on the surface in order to improve the adhesion and compatibility between surrounding layers of the laminate for conditioning, and / or to obtain additional properties such as improved stiffness. This surface treatment can be provided by exposing the material's surface to corona, ozone or flame treatments, or the like.
[0034] The volume layer has, for example, a thickness of 80 to 100 μm, such as from 90 to 800 μm, such as from 150 to 600 μm, such as from 200 to 550 μm, such as from 250 to 350 μm. Expressed as surface weight, g / m2, a corresponding suitable range is from 20 to 440 g / m2, such as from 25 to 350 g / m2, such as from 45 to 250 g / m2, such as from 60 to 220 g / m2 m2, such as from 60 to 200 g / m2. A volume layer suitable for the aspects and embodiments described herein mainly comprises foamed cellulose. According to one embodiment, the laminate comprises a volume layer comprising foamed cellulose and at least one additional paper layer.
The volume layer, which includes a foamed cellulose layer and optionally an additional cellulose layer, can be provided with coatings such as, for example, clay coating, or can be modified on the surface. Such coatings or surface modifications may also be suitable for application to an additional layer, which is, for example, intended to be printed, and disposed between the volume layer (optionally including an additional cellulose layer) and the decoration layer. The volume layer, optionally including an additional layer, can be surface modified or there may be an adhesive or bonding layer to facilitate compatibility and bonding between the volume layer and additional layers.
[0036] The volume layer comprises foamed cellulose and is characterized by a density of less than 700 kg / m3, such as from 100 to 600 kg / m3, such as from 100 to 500 kg / m3, such as from 200 to 500 kg / m3, such as from 200 to 400 kg / m3, such as from 300 to 500 kg / m3, such as from 300 to 400 kg / m3. In some aspects and embodiments, the volume layer consists of foamed cellulose and the volume layer has a density of less than 700 kg / m3, from 100 to 600 kg / m3, such as from 100 to 500 kg / m3, such as from 200 to 500 kg / m3, such as from 200 to 400 kg / m3, such as from 300 to 500 kg / m3, such as from 300 to 400 kg / m3. The lower the density of the foamed cellulose layer, the greater the cost-effectiveness compared to the raw materials consumed, while obtaining a better resistance to the thickness reducing properties of a foamed cellulose above 300 kg / m3 . According to one embodiment, it has been found that the optimum density of foamed cellulose to be used in laminated packaging materials is 300 to 500 kg / m3, in particular 300 to 400 kg / m3.
[0037] In some embodiments, the packaging materials comprise a volume layer that has a decoration layer of thermoplastic material, that is, the heat-removable outer side of the filled and sealed packaging container. The side of the volume layer that must be the outer side of the closed and sealed packaging container may contain an impression covered by the decoration layer.
[0038] According to aspects and embodiments described here, the volume layer provides an opportunity to incorporate a foamy cellulose, in a laminated packaging material suitable for the preparation of packaging containers for food products, especially for liquid food products and semi-liquids. The lamination of the bulk layer to polymer layers can be carried out by melt extrusion operations, such as extrusion coating and extrusion lamination of the plastic layers. Extrusion is generally carried out at elevated temperatures, such as, in the case of low density polyethylene, up to about 330 ° C. It was found that such temperatures did not become a major problem for a volume layer comprising foamed cellulose, unlike the case of volume layers of foamed polymer layers. Foamy cellulose has a low heat transfer and thermal stability above 300 ° C, as opposed to foamed polymer layers in general and foamed polyolefin layers in particular, which would provide the most realistic and viable foamed polymer alternative of a cost and environmental perspective. It has been found that at relatively low densities of 300 to 400 kg / m3, the foamed cellulose does not significantly lose its thickness in extrusion lamination operations, and maintains sufficient delamination force, or the so-called z-force, for use in laminates for packaging for the purpose of the invention.
[0039] The volume layer comprising foamed cellulose as described in aspects and embodiments contained herein, still provides the desired resistance against delamination, that is, it does not easily delaminate under standard conditions. The delamination force can be determined, for example, by the Huygen Internal Bonding Energy test device which follows the TAPPI T569 and provides a value of J / m2 where the packaging material here is between 60-300 J / m2, such as 60-250 J / m2, such as 80-200 J / m2, such as 140-200 J / m2. In some aspects and embodiments, the volume layer provides a distance between a barrier layer and an outermost thermoplastic decoration layer and, thus, allows tailor-made laminated packaging material structures. In some embodiments, the volume layer comprising foamed cellulose provides delamination strength in combination with the compressive strength in the direction of thickness, which provides sufficient distance between the barrier layer and the decoration layer.
[0040] Foamed cellulose can be generated by mixing cellulose fibers and a foaming fluid, such as water and optionally a surfactant such as sodium dodecyl sulfate (SDS). The amount of the surfactant should be 0.1% by weight to 20% by weight, such as 0.5% by weight to 10% by weight, such as 1% by weight to 5% by weight, such as 1.5 % by weight to 3% by weight. A rotor mixer in a generic foam generator generates the foamed cellulose. Foam is usually formed by introducing a gas into the mixture. Air is an example of an appropriate gas. Another suitable gas is oxygen. Generally, the gas is introduced into the mixture by pressurized gas and the vortex caused by agitation. Generally, cellulose is supplied as a liquid dispersion comprising cellulose fibers. An example of a liquid is water. Some examples of cellulose fibers are cellulose-based fibers, such as chemical pulp fibers, chemical-thermomechanical pulp fibers, thermomechanical pulp fibers and Kraft paper pulp fibers. The fiber dispersion can, for example, be added to the foaming fluid after foaming by the fluid (including the surfactant). Optionally, the liquid dispersion comprising cellulose fibers can be combined with the foaming fluid prior to foaming. An additive can be added to control the consistency of the foam, if necessary. The foamed cellulose generated as described here is conducted through a nozzle arrangement (“distribution box”) where the pressure and forming tools generate a continuous sheet of foamed cellulose that is wound in a coil, after drying at least partially and be stored before future use to prepare, for example, a packaging material. Optionally, the foamed cellulose web can be used in-line, that is, directly apply additional layers to transform the foamed cellulose web into a laminated packaging material for liquid or semi-liquid food packaging. In comparison to traditional papermaking, additional or modified drying can be used appropriately to achieve the desired dryness and density.
[0041] In some embodiments, the foamed cellulose may be mixed with other materials, for example additives, and / or microfibrillated cellulose, and / or refined pulp and / or resistance agents or chemicals, such as starch and derivatives, manogalactans, carboxymethylcellulose, melamine formaldehyde colloids, urea-formaldehyde resins, polyamide-polyamine-epichlorohydrin resins.
[0042] In some embodiments, the packaging materials comprise an additional layer between the decoration layer and the volume layer. The additional layer can be, for example, a layer of paper or cardboard or a polymer film. The additional layer may contain an imprint on the side that must become the outside of the packaging container. Whenever the additional layer is a paper, cardboard or cellulose layer, a weight of at least 20 g / m2 is appropriate and in some embodiments between 20 and 100 g / m2. The paper layer can be coated with a layer of white clay to improve the whiteness of the surface. Whenever the additional layer is a polymer film, its thickness must be between 10-50 μm. Examples of suitable films are oriented prefabricated films, such as BOPP (biaxially oriented polypropylene), BoPET (biaxially oriented polyethylene terephthalate), polyamide and oriented high density polyethylene films.
[0043] In some embodiments, the additional layer is selected from a paper layer having a weight between 20 and 100 g / m2 and a polymer film having a thickness of 10-50 μm.
[0044] According to aspects and embodiments described herein, the packaging material comprises a volume layer having a density less than 700 kg / m3 and comprising foamed cellulose, said packaging material further comprises an additional layer arranged by aid of a bonding layer, such as a thermoplastic polymer bonding layer, such as a polyolefin-based polymer or copolymer bonding layer, wherein the bonding layer is arranged between the volume layer and the layer additional, and said additional layer on the opposite side of the joining layer has an arranged decoration layer, said volume layer, on the opposite side of the joining layer, is provided with a barrier layer, which, on the opposite side to the volume layer, is provided with a heat-removable layer. The decoration layer is a polyolefin layer such as the outermost heat-sealable polyolefin layer mentioned above to be in contact with the environment of a packaging container, for example, LDPE or polypropylene. The decoration layer provides additional protection, for example, moisture resistance and scratch / wear resistance and stability to the packaging container.
[0045] The decoration layer is comprised of one or more heat-removable polyolefin layer (s) facing the surrounding environment of a resulting packaging container, suitable polyolefins are low density type polyethylene, selected from the group consisting of LDPE, LLDPE, VLDPE, ULDPE or mLLDPE and mixtures of two or more of them, optionally other polyolefins such as high density polyethylene (HDPE), polypropylene or propylene co or terpolymers are useful as the environmentally friendly layer. The decoration layer can be applied by extrusion coating or other suitable techniques. An example of polyethylene for use as a decoration layer is an extrusion-type LDPE, for example, having an LDPE having a melt flow index (as determined according to ASTM D1238, 190 ° C / 2.16 kg) 4-15, such as 6-9 and a density (as determined according to ISO 1183, method D) of 915-922 kg / m3, such as 918-920 kg / m3. The thickness of the decoration layer of the packaging material is, for example, between 5 μm-50 μm such as 7 μm-30 μm, such as 7 μm-20 μm, such as 8 μm-15 μm.
[0046] On the side of the volume layer opposite the decoration layer and, therefore, facing the interior of the final packaging container, a barrier layer is arranged, for example, by means of an intermediate laminate layer that could be a polyolefin-based layer, for example, HDPE, LDPE, polypropylene, or another suitable thermoplastic polymer layer, such as ethylene-acrylic acid copolymer (EAA), which further facilitates adhesion between the volume layer and the barrier to oxygen. Optionally, the volume layer and / or the barrier layer can be treated or modified in order to achieve adhesion between the layers, in which case the laminate layer may not be necessary. For example, a coating that modifies the surface of one or more of the substrates can be used. In some embodiments, the barrier layer is an aluminum foil, film or barrier coating. When using aluminum foil, a suitable thickness is between 3-15 μm, such as 5-10 μm, such as 5-8 μm. The laminate layer is in an embodiment applied by an extrusion process using commercially available extrusion equipment. Materials, suitable as a laminate layer, are known and conventionally comprise a polyolefin. According to an embodiment, the laminated material comprises a polyethylene or mixtures thereof. Within the polyethylene group, the properties of the lamination layers can be varied and adapted in order to achieve various final properties in a packaging material. Variations of the laminate layer for the desired type of packaging material for liquid and semi-liquid foods thus found widely within the group of polyethylene polymers. Suitable types of LDPE are, for example, manufactured by Dow, Exxon Mobile, Borealis and Ineos etc., such types are well known to those skilled in the art. The laminate layer can also be selected from ethylene copolymers and other alpha-olefin monomers which include, for example, low linear density polyethylene, also ethylene and propylene copolymers in different proportions, for example so-called plastomers or elastomers of the type marketed by Dow under the names “Engage” and “Affinity”, as well as ethylene-acid (meth) acrylic copolymers and also ethylene, propylene terpolymers and an alpha-olefin monomer having polyethylene-like properties. Examples of polymers that can help improve various mechanical properties are called linear polyolefins, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), linear low density polyethylene (LLDPEA / LDPE / ULDPE) produced with conventional catalysts or with so-called single-site catalysts, or catalysts of restricted geometry, including the so-called metallocene LLDPE (mLLDPE) and polypropylene (PP). Very low density polyethylene (VLDPE) and ultra low density polyethylene (ULDPE) are examples of subcategories within the category of linear low density polyethylene. Depending on the type and amount of the comonomer, these polymers generally have greater durability in several aspects. Variations from the laminating material to the desired type of packaging material for beverages and liquids are within the group of polyethylene polymers, for example, polymers selected from the group including low density polyethylene (LDPE), high density polyethylene (HDPE), medium density polyethylene (MDPE), linear low density polyethylene (LLDPEA / LDPE / ULDPE) produced with conventional catalysts or with the so-called single site catalysts or restricted geometry catalysts, including the so-called metallocene LLDPE (mLLDPE) and mixtures or combinations thereof; and propylene or polypropylene co or terpolymers. An example of a suitable laminate layer is polyethylene, for example, extrusion-type LDPE, for example, having a melt flow index (as determined according to ASTM D1238, 190 ° C / 2.16 kg) 2-13, such as 5-10, and a density (as determined according to ISO 1183, method D) of 914-922 kg / m3, such as 915-920 kg / m3. The thickness of the laminate layer of the packaging material is, for example, between 5 μm-50 μm such as 10 μm-30 μm, such as 15 μm-30 μm, such as 17 μm-25 μm.
[0047] The barrier layer, such as the oxygen barrier (for example, aluminum foil or a polymer film such as a thermoplastic film coated with vapor deposition) is arranged with the help of the laminate layer on the side opposite the layer of volume. Optionally, the volume layer and / or the barrier layer can be treated or modified in order to achieve adhesion between the layers, in which case the laminate layer is not necessary. For example, a coating that modifies the surface of one or more of the substrates can be used. In some embodiment, the barrier layer has an adhesive on the side opposite the optional laminate layer. The adhesive is within the ability of those skilled in the art to select depending on the desired properties and compatibility with the layer to which it is in contact. When the barrier layer is aluminum foil, an example of an adhesive is copolymers of ethylene with comonomers having carboxylic acid functionality such as ethylene-acrylic acid copolymer, for example, marketed under the trademark Primacor® by Dow or Nucrel® by Dupont.
[0048] Generally, the different layers present in the packaging material are possible to detect, for example, by microscopy. It may not be possible to separate one or more of the layers, for example, the adhesive from the heat-sealable layer, and so, in certain embodiments, the layer that forms the interior of the packaging container is a combination of the adhesive and the heat-sealable layer, where the heat-removable layer is directed towards the liquid or semi-liquid food product. The adhesive layer of the packaging material as described herein has a thickness between 3 μm-12 μm, such as 4 μm-10 μm such as 5 μm-9 μm. The adhesive layer can be characterized by different methods including, for example, infrared (IR) spectroscopy.
[0049] The packaging material contains a heat-resistant inner layer. An example of a heat-curable layer is a heat-curable polyolefin polymer that is applied as a layer to be directed into the container, that is, in direct contact with food. The heat-sealable layer for the innermost layer may suitably be a low density type polyethylene polymer, selected from the group consisting of LDPE, LLDPE, VLDPE, ULDPE or mLLDPE and mixtures of two or more of the same. The arrangement of the heat-sealable layer is similar to the laminate layer and what has been described above in connection with the laminate layer also applies to the innermost heat-sealable layer. Depending on the type of packaging containers produced from the packaging material, the innermost layers of high density polyethylene, co or terpolymers of polyethylene or polypropylene, are also conceivable within the scope of the appended claims, as long as they are compatible and achieve desired effect in combination with other components of the packaging material and, in particular, the adhesive as described herein. Examples suitable for use as inner layers are combinations between LDPE and mLLDPE (for example, 50/50, 40/60, 60/40, 30/70, 70/30, 20/80, 80/20% combination ratios by weight), such as extrusion-type LDPE, for example, having a melt flow index (as determined according to ASTM D1238, 190 ° C / 2.16 kg) of 212, such as 2-7, such as such as 2-5.5 and a density (as determined according to ISO 1183, method D) of 914-922 kg / m3, such as 915920 kg / m3. Examples of mLLDPE suitable for use in aspects and embodiments described here have a density less than 0.922 kg / cm3 and a melt flow index (MFI) of 15-25 at 190 ° C and 2.16 kg (ASTM 1278) . Additional details are well known and within the skill of the skilled person, additional understanding can be obtained, for example, in US6974612. The thickness of the innermost layer of the packaging material is, for example, between 5 μm-50 μm, such as 10 μm-30 μm, such as 15 μm-30 μm, such as 17 μm - 25 μm. Naturally, the examples mentioned above are functioning as a general guide and other polymers are also possible.
[0050] Thus, the aforementioned layers of packaging material are for example and conventionally applied to the respective side of the volume material by extrusion techniques.
[0051] Some embodiments thus refer to a packaging material that comprises a decoration layer that, on one side of the layer, has a volume layer having a density less than 700 kg / m3 and comprises foamed cellulose that , on the side opposite the decoration layer, it has a barrier layer, which on the side opposite the volume layer has a heat-removable layer. In some embodiments, the barrier layer is arranged in the volume layer by means of a laminate layer. The layer materials are selected from the layers described above. In some embodiments, the packaging material is used to produce packaging containers for liquid or semi-liquid foods. In some embodiments, the packaging material comprises an additional layer between the volume layer and the decoration layer. In some embodiments, the additional layer has a weight of surface weight of at least 20 g / m2. If necessary, for example, to achieve an improved adhesion between the additional layer and the volume layer, a bonding layer is present. In some embodiments, the bonding layer is selected from among the materials listed in the laminate layer description. In some embodiments, the additional layer is a paper layer or a polymer layer or film. In some embodiments, the additional layer can be coated on the surface or modified on the surface in order to increase the adhesion to the adjacent layers.
[0052] According to a possible production method, the packaging container is obtained by providing a volume layer with an optional print and a suitable crease pattern, the volume layer has a hole cut for an opening so that a container packaging unit has at least one hole (or attenuation). The aforementioned crease patterns serve as fold lines to form the final package such as a Tetra Brik ® Aseptic. An example of a crease pattern can, for example, be seen in Fig. 3 of WO2012 / 163753. The volume layer is fed from a roll and the volume sheet web is optionally treated with heat and / or ozone. The laminate layer is arranged, on the side opposite the optional printing, with the help of a plastic film coming out of an extruder. Typically, the extruded material has a temperature above 260 ° C, such as above 280 ° C, such as above 290 ° C, such as above 300 ° C. For some materials, an extrusion lamination temperature above 290 ° C is preferred. In order to better describe the extrusion, Fig. 3 describes a schematic illustration of an extruder (31) suitable for the arrangement of the laminate layer (13) in the volume layer (12), additionally showing a cast plastic film (32 ) of the polymer to become the laminate layer (13) arranged on the volume layer web (35). The extruder melts and mixes the polymer. In the case of combinations, the extruder can also be used to combine the polymers that are, for example, supplied via separate hoppers. The molten film (32) and the volume layer are joined in an interstice between the rollers (33 and 34). The other polymer layers (adhesive and heat-sealable layer) are added to the volume layer (35) using a similar arrangement. The barrier layer (14) can be arranged from a separate roll and arranged together with the laminate layer (13), or with an adhesive.
[0053] In one embodiment, the packaging material described herein, and in the appended claims, provides a packaging material comprising a decoration layer (11) which, on one side of the layer, has an additional layer (27), said additional layer on the side opposite the decoration layer has a joining layer in order to arrange a volume layer, said volume layer (12), on the side opposite the decoration layer (11) has a laminate layer ( 13), said laminate layer (13), opposite the volume layer (12) has an oxygen barrier (14), said oxygen barrier (14), opposite the laminate layer (13) it has an adhesive (15), and said adhesive (15) on the side opposite the oxygen barrier (14) has a heat-removable layer (16). The packaging material is in an embodiment transformed into an aseptic packaging container. The transformation can be carried out by pre-folding and sealing parts of the packaging material in a matrix. Examples of packaging made from dies are, for example, Tetra Recart® and long-life containers. The die can be provided with an opening device and filled and sealed in a filling machine suitable for handling dies. The transformation of a packaging material into a packaging container can also be carried out using continuous forming-filling-sealing technology with tubular web, for example, in a Tetra Pak® A3 Speed / Flex. A packaging container formed from the packaging material according to the aspects and embodiments described herein can be of any known form. In some respects, the container described here refers to a substantially brick-shaped or wedge-shaped container that is durable in handling and distribution and resistant to moisture and gaseous oxygen during long-term storage, due to the material of high quality packaging, which in turn also provides for sufficient sealing quality and gas barrier properties. Other types of cardboard-based packaging for liquid packaging where the aspects and embodiments described here can be useful is a brick-shaped packaging container, a long-life packaging container, a wedge-shaped packaging container , a square, rectangular or octagonal packaging container. More specifically, the so-called Tetra Brik®, Tetra Brik® Aseptic, Tetra Brik® Edge, Tetra Gemina® Aseptic, Tetra Prisma® Aseptic, Tetra Rex® and Tetra Top® and Tetra Evero® or other bottle-type packaging comprising a glove cardboard-based packaging material, a bottom formed by folding it and a top and screw cap of a material in the form of a plastic mold. An embodiment described here relates to Tetra Brik® packages of known sizes such as 200 ml, 250 ml, 500 ml and 1000 ml, which can optionally have a square base, or an inclined top such as for example Tetra Brik® Edge.
[0054] It has generally been concluded that the amount of cellulose fibers can be significantly reduced in the laminated packaging material of the invention, although it has nevertheless maintained mechanical properties and suitability for packaging food in general and for packaging cardboard for liquid. , in particular. In addition, detailed descriptions of embodiments are described in connection with the description of embodiments. EXAMPLES
[0055] The aqueous cellulose pulp was mixed from about 75% by weight of fir CTMP fibers with a CSF (Canadian Standard Release) value of 530 ml with about 25% by weight of bleached chemical pulp from soft wood at a concentration of about 3-4%. A foaming fluid was prepared by mixing about 2% by weight of sodium dodecyl sulfate SDS in water. After stirring and simultaneously adding pressurized air, until a suitable foam was created, the fiber dispersion was added to the foam under continuous stirring and mixing. The fibrous foam thus obtained was compressed through a nozzle (distribution box) and molded in a coating on a continuous sheet in movement of porous felt to drain the water and the wedge-shaped foam sheet was subsequently dried.
[0056] In a first specific embodiment, the properties of foamy cellulose were investigated, in the lamination operation during the conversion of packaging materials into a laminated packaging material.
[0057] In order to analyze the effect of thermal and mechanical load on foamy cellulose during lamination, tests were carried out on various low density materials. The tested materials were foamed cellulose and foamed polypropylene. The lamination of packaging material structures was carried out in a flexible laboratory laminator with two extrusion coating stations. The laminator configurations were about 100 m / min web speed, 250-275 N web tension and the reference interstitial load was 25 N / mm. In each extrusion coating operation, 15-20 g / m2 of LDPE was melted extruded over the foamed cellulose layer on the respective sides, at a melt extrusion temperature of about 320 ° C. The original thickness before lamination and the thickness after lamination were measured optically using an Olympus BX51 Microscope. Sample preparation was done using a microtome.
[0058] In Figure 6 the resulting thickness reductions are shown. For example, the ID “FC 300 2x” means that a foamed cellulose with a density of 300 kg / m3 has been laminated with an interstitial load twice that of the reference interstitial load. Generally, it can be seen that the remaining thickness of foamed cellulose is substantially higher compared to the laminated variant with foamed polymeric materials.
[0059] It was also concluded that extrusion coating lamination works well with foamed cellulose with a density of 300 kg / m3 or greater. Laminates having low weight layers of foamed cellulose are more sensitive to heat and laminating pressure and show a greater reduction in the thickness of the expanded cellulose material.
[0060] In addition, the reduction in thickness of a polymer foam is permanent, due to the melting and reconformation of the heated polymer foam cells, while there is a spring return effect in the foamed cellulose, so that the reduction of thickness during lamination is inverted to a final thickness that is only reduced by about 10-15% in the reference interstice at densities of about 300-400 kg / m3. The higher the density of a foamed cellulose, the better this spring return effect, or resistance to ZD compression.
[0061] In a second specific embodiment, packaging containers of the type Tetra Brik® 250 ml were prepared from a laminated packaging material having a volume layer from a foam produced accordingly. The packaging material comprises a decoration layer of 12 g / m2 of an LDPE, which is arranged to become the outside of the package. Additional layers from the decoration layer were: 70 g / m2 white paper; LDPE as a bonding layer of 15 g / m2; a volume layer of foamy cellulose, 332 kg / m3, 243 μm; a layer of 20 g / m2 LDPE laminate and a barrier layer of about 6 μm of aluminum foil, a 6 g / m2 adhesive (Primacor ™ 3440) and a 19 g / m2 heat seal layer of one combination of LDPE (30% by weight) and a linear catalyzed metallocene, low density polyethylene. The packaging material was obtained in a roll that was processed according to the conventional manufacturing process to generate 250 ml Tetra Brik ® packaging containers containing orange juice. From this test, it was concluded that the amount of cellulose fibers could be reduced by 25%, compared to a corresponding material having a conventional cardboard layer in a corresponding traditional packaging laminate with 12 g / m2 LDPE decoration , 80 mN (200 g / m2) cardboard, 20 g / m2 LDPE laminate layer, 6 μm aluminum foil, 6 g / m2 adhesive (Primacor ™ 3440) and 19 g / m2 heat seal layer a combination of LDPE (30% by weight) and linear catalyzed metallocene, low density polyethylene.
[0062] Furthermore, in addition to reducing the amount of material used in the laminated packaging material, the volume layer is still based on renewable natural sources, that is, cellulose.
[0063] To determine the density of the volume layer, different procedures can be applied depending on the layers of the packaging material. The density (kg / m3) of the volume layer comprising foamed cellulose in a multilayer packaging material can be determined by dividing the grammage (kg / m2) by the thickness (m). The thickness can be obtained using a standard microscope. Separate grammage can be achieved by a standard separation procedure using circular discs of 1 dm2 of packaging material. All measurements are performed in a controlled environment of 23 ° C and 50% relative humidity. The total grammage of the packaging material is measured using a balance (accuracy of 0.001 g). The packaging material is divided into the foamed cellulose layer to obtain two folds. The two folds are placed in a beaker containing copper ethylenediamine solution until all cellulose fibers are easily removed. Then, the remaining grammage is determined and the foamed cellulose grammage can be calculated by subtracting the remaining grammage from the total grammage. Whenever at least one of the folds contains an aluminum layer, the procedure should be to measure the grammage of each fold and use an acetic acid solution instead of the copper ethylenediamine solution and leave the folds for 3 to 4 hours. The layers of packaging material folds are divided into individual layers and the corresponding individual layer grammage is determined and subtracted from the total grammage. Whenever an additional layer of paper is present, the above method is applied, but the paper layer is removed, for example, by grinding. The weight of the earth material is determined and appropriately corrected when calculating the density of the volume layer. DESCRIPTION OF THE DRAWINGS
[0064] Other advantages and favorable characterizing features will be evident from the detailed description below, with reference to the attached figures, in which:
[0065] Figs 1a and 1b are cross-sectional views of laminated packaging materials according to the aspects described here.
[0066] Fig. 2a and 2b are cross-sectional views of laminated packaging materials according to the aspects described here.
[0067] Fig. 3 is a schematic drawing of an extruder, the extruded film, a continuous sheet of paper or packaging material and the rollers are arranged to join the plastic and the volume layer.
[0068] Fig. 4 shows examples of packaging containers produced from the packaging material according to the embodiments described here.
[0069] Fig. 5 shows the principle of how such packaging containers are manufactured from the packaging material in a continuous process of forming, filling and sealing. General description of the embodiments
[0070] Fig. 1a schematically illustrates a cross section of a packaging material. The decoration layer (11) is a polyolefin such as a suitable LDPE or PP. The decoration layer can, for example, be used to provide coverage of a printed pattern, a hole and / or weakening (not shown in the figure) provided in any of the other layers. A volume layer (12) is arranged on one side of the decoration layer. On the other side of the volume layer, opposite the decoration layer, a barrier layer (14) is arranged. Between the barrier layer and the volume layer, an optional laminate layer can be arranged, if necessary. Similarly, one or both layers can be surface-modified or contain a coating to provide sufficient adhesion between the bulk layer and the barrier layer. The barrier layer (14) provides a desired barrier such as a barrier to oxygen, light, water and steam, depending on the specific need determined by the product to be packaged. The barrier layer can, for example, be an aluminum foil or a film deposited in vapor, such as a film coated with metallized or vapor deposition, such as film coated with PECVD. On the side opposite to the volume layer, the barrier layer is arranged with a heat-removable layer (16) such as a suitable polyolefin such as PE or PP or combinations thereof. Between the barrier layer and the heat-sealable layer, an adhesive can be used when necessary. The heat-removable layer is the product-facing layer in the finished packaged packaging container.
[0071] Fig. 1b schematically shows a cross section of a packaging material. The decoration layer (11) is a polyolefin such as a suitable LDPE or PP. The decoration layer can be used to provide coverage of a printed pattern, a hole and / or weakening (not shown in the figure) that is provided in the volume layer (12), the layer of which is arranged on one side of the decoration layer ( 11). The volume layer (12), opposite the decoration layer, has a laminate layer (13) selected from suitable polyolefins such as LDPE or PP. The laminate layer provides adherence to the oxygen barrier (14), which is arranged on the opposite side of the volume layer (13). The barrier layer (14) provides the desired barrier as well as a barrier to oxygen, light, water and steam, depending on the specific need determined by the product to be packaged. The barrier layer can, for example, be an aluminum foil or a vapor deposited film, such as a vapor deposited or metallized film, such as a PECVD coated film. On the side opposite the laminate layer, an adhesive polymer (15) is arranged on the barrier layer. The adhesive polymer (15) can for example be applied by extrusion coating. When the barrier layer is aluminum foil, the adhesive can be a suitable adhesive such as an ethylene-acid (meth) acrylic (E (M) AA) copolymer marketed under the trade name Primacor® or Nucrel®. On the side opposite the barrier layer, the adhesive is provided with a heat-removable layer (16) such as a suitable polyolefin such as PE or PP or combinations thereof. The heat-removable layer is the product-facing layer in the finished packaged packaging container.
[0072] Fig. 2a schematically shows a cross section of a packaging material. The decoration layer (21) is a polyolefin such as a suitable LDPE or PP. The decoration layer can be used to provide coverage of a printed pattern, a hole and / or weakening (not shown in the figure) that is provided in the volume layer (22), the layer of which is arranged on one side of the decoration layer ( 21). An additional layer (27) of paper or cellulose is arranged between the decoration layer (21) and the volume layer (22). The volume layer (22), opposite the decoration layer, has a laminate layer (23) selected from suitable polyolefins such as LDPE or PP. The laminate layer provides adherence to the oxygen barrier (24), which is arranged on the opposite side of the laminate layer (23). The barrier layer (24) provides the desired barrier, such as a barrier to oxygen, light, water and steam, depending on the specific need determined by the product to be packaged. The barrier layer may, for example, be an aluminum foil or a vapor deposited film, such as a film coated by vapor deposition or metallized, such as a film coated with PECVD (plasma enhanced chemical vapor deposition). On the side opposite the laminate layer, an adhesive polymer (25) is arranged on the barrier layer. The adhesive (25) can, for example, be applied by extrusion coating. When the barrier layer is aluminum foil, the adhesive can be a suitable ethylene-acid (meth) acrylic copolymer (E (M) AA) marketed under the trade name Primacor® or Nucrel®. On the side opposite the barrier layer, the adhesive is provided with a heat-removable layer (26) such as a suitable polyolefin such as PE or PP or mixtures thereof. The heat-removable layer is the product-facing layer in the finished packaged packaging container.
[0073] Fig. 2b schematically shows a cross section of a packaging material. The decoration layer (21) is a polyolefin such as an appropriate LDPE or PP. The decoration layer can be used to provide a cover for a printed pattern, a hole and / or fade (not shown in the figure) that is provided in one or more of the other layers of the laminate. On one side and adjacent to the decoration layer, a thin paper (27) of a surface weight of about 100 g / m2 or less is arranged. The thin paper layer (27) is laminated to a volume layer (22), opposite the decoration layer, by an intermediate thermoplastic outer bonding layer (28). The bonding layer (28) can be selected from suitable polyolefins such as LDPE or PP or combinations thereof. The bonding layer (28) joins the bulk cellulose layer (22) and the thin paper layer (28) together. The volume layer (22) is further laminated to a laminate layer (23) of thermoplastic polymer, on the side of the volume layer opposite the laminated side to the joining layer (28). The laminate layer (23) provides adherence to an oxygen barrier layer (24), which is arranged on the opposite side of the laminate layer (23). The barrier layer (24) provides the desired barrier, such as a barrier to oxygen, light, water and steam, depending on the specific need determined by the product to be packaged. The barrier layer may, for example, be an aluminum foil or a film deposited in vapor, such as a film coated with vapor deposition or metallized, such as a film coated with PECVD. On the side opposite the laminate layer, an adhesive polymer (25) is arranged over the barrier layer. The adhesive (25) can, for example, be applied by extrusion coating. When the barrier layer is aluminum foil, the adhesive can be a suitable ethylene-acid (meth) acrylic copolymer (E (M) AA) marketed under the trade name Primacor® or Nucrel®. On the side opposite the barrier layer, the adhesive is provided with a heat-removable layer (26) such as a suitable polyolefin such as PE or PP or combinations thereof. The heat-removable layer is the product-facing layer in the finished packaged packaging container. Fig. 3 is a schematic illustration of an extruder (31). An extruder of the schematic illustration is suitable for the application of the decoration layer (11), the laminate layer (13), the adhesive (15) and the heat-sealable layer (16). As an example, the laminate layer (13) can be applied to the volume layer (12), whereby the drawing shows a cast plastic film (32) of the polymer to become the laminate layer (13) being arranged by coating of melt extrusion in a volume layer (35). The extruder melts and mixes the polymer (s). In case the layers are mixtures of polymers, the extruder can also be used to combine the polymers which are, for example, supplied via separate hoppers to the polymer granules. The molten film (32) and the volume layer are joined in a rolling gap between rollers (33 and 34) that exert a pressure. One of the rollers can be a refrigerated roll that reduces the temperature of the polymer when in the interstice. Similarly, the other polymers of the packaging material can be added to the volume layer (35). The barrier layer (14) can, for example, be routed from a separate roll and fed through the laminating interstice together with the laminate layer (13), or with an adhesive.
[0074] Fig. 4 shows an example of a packaging container 50a produced from the packaging material described in Fig. 1 or 2. The packaging container is particularly suitable for liquid or semi-liquid food products such as drinks, sauces, soups or the like. Typically, such a package has a volume of about 100 to about 2000 ml. It can be of any configuration, such as those previously described here, but it is for example in brick form, having longitudinal and transverse seals 51a and 52a, respectively, and optionally an opening device 53. In another embodiment, not shown, the packaging container can be shaped like a wedge. In order to obtain such a "wedge shape", only the bottom of the package is formed folded in such a way that the transverse heat seal of the bottom is hidden under the triangular corner flaps, which are folded and sealed against the bottom of the package. The cross-sectional seal of the upper section is unfolded. In this way, the semi-folded packaging container is still easy to handle and dimensionally stable (i.e., substantially maintains shape and conformation) when placed on a shelf in the food store or on a table or the like.
[0075] Fig. 5 shows the principle as described in the introduction of the present application, that is, a continuous sheet of packaging material is formed in a tube 71 by the longitudinal edges 72, 72 'of the continuous sheet being joined to each other in an overheated gasket 73. The tube is filled 74 with the desired liquid food product and is divided into individual packs by repeated transverse seals 75 of the tube at a predetermined distance from each other below the level of the filled content in the tube.
[0076] The packages 76 are separated by incisions in the transverse seals and the desired geometric configuration is given by fold formation along lines of crease prepared in the material.
[0077] The invention is not limited by the embodiments illustrated and described above, but may vary within the scope of the claims. Modifications and alterations, obvious to a person skilled in the art, are possible without departing from the concept as described in the appended claims.

权利要求:
Claims (24)
[0001]
1. Packaging material for a packaging container for liquid or semi-liquid food, characterized by the fact that it comprises a decoration layer (11) which, on one side of the layer, has a volume layer (12) having a density less than 700 kg / m3 and foamed cellulose of at least 25% thickness of the volume layer, which, on the opposite side of the decoration layer (11), has a barrier layer (14), which, on the opposite side of the layer volume (12), has a heat-removable layer (16).
[0002]
2. Packaging material according to claim 1, characterized by the fact that it comprises an adhesive between the heat-removable layer and the barrier layer.
[0003]
Packaging material according to claim 1 or 2, characterized by the fact that it comprises a laminate layer between the volume layer and the barrier layer.
[0004]
Packaging material according to any one of claims 1 to 3, characterized by the fact that it comprises an additional layer between the decoration layer and the volume layer.
[0005]
Packaging material according to claim 4, characterized by the fact that the additional layer is a paper or cardboard layer or a oriented polymer film.
[0006]
6. Packaging material according to claim 5, characterized by the fact that the additional layer is a paper layer having a grammage of at least 20 g / m2.
[0007]
Packaging material according to claim 4 or 5, characterized by the fact that it comprises a bonding layer between the additional layer and the volume layer.
[0008]
Packaging material according to any one of claims 1 to 6, characterized by the fact that the volume layer has a density of 100 to 600 kg / m3, such as from 100 to 500 kg / m3, such as from 200 to 500 kg / m3, such as from 300 to 500 kg / m3, such as from 300 to 400 kg / m3.
[0009]
Packaging material according to any one of claims 1 to 6, characterized in that the volume layer has a weight of surface weight of at least 20 g / m2, such as at least 60 g / m2, such as such as between 60 and 250 g / m2.
[0010]
10. Packaging material according to any one of claims 1 to 9, characterized in that the decoration layer is selected from heat-removable polyolefin layer (s) selected from the group consisting of low density polyethylene (LDPE) ), low linear density polyethylene (LLDPE), very low density polyethylene (VLDPE), ultra low density polyethylene (ULDPE) or LLDPE manufactured using metallocene catalysts (mLLDPE) and mixtures of two or more of the same; high density polyethylene (HDPE); co or terpolymers of polypropylene or propylene.
[0011]
Packaging material according to any one of claims 3 to 9, characterized in that the laminate layer and the heat-sealable layer are individually selected from the group consisting of low density polyethylene (LDPE), high density polyethylene ( HDPE), medium density polyethylene (MDPE), low linear density polyethylene (LLDPE), very low density polyethylene (VLDPE), ultra low density polyethylene (ULDPE) or LLDPE manufactured using metallocene catalysts (mLLDPE) and mixtures thereof ; and polypropylene or propylene co or terpolymers.
[0012]
Packaging material according to any one of claims 1 to 9, characterized by the fact that the oxygen barrier is selected from the group consisting of aluminum foil and film coated by vapor deposition, such as film coated by deposition of vapor. metallized or chemical vapor.
[0013]
Packaging material according to any one of claims 1 to 10, characterized in that the packaging material has a resistance to delamination between 60 and 300 J / m2 as determined according to TAPPI T569.
[0014]
Packaging container manufactured from a packaging material as defined in any one of claims 1 to 13, characterized in that the packaging container is a container for liquid or semi-liquid food product.
[0015]
Packaging container according to claim 14, characterized in that the packaging container is a brick-shaped packaging container, a long-life packaging container, a wedge-shaped packaging container, a storage container packaging with a quadrangular, rectangular or octagonal base, or a bag.
[0016]
16. Method for providing a packaging material for a packaging container for liquid or semi-liquid food, the method characterized by the fact that it comprises providing a volume layer having a density less than 700 kg / m3 and comprising foamed cellulose; provide a polyolefin decoration layer on one side of the volume layer; providing a barrier layer on the opposite side of the decoration layer; providing a heat-removable layer in the barrier layer, on the opposite side of the volume layer; and wherein the packaging material is obtained by extrusion lamination and / or hot pressure lamination.
[0017]
17. Method according to claim 16, characterized in that it additionally comprises the step of providing an adhesive between the heat-removable layer and the barrier layer.
[0018]
Method according to claim 16 or 17, characterized in that it further comprises the step of providing a laminate layer between the bulk layer and the barrier layer.
[0019]
Method according to any one of claims 16 to 18, characterized in that it additionally comprises a step of providing an additional layer between the decoration layer and the volume layer.
[0020]
20. Method according to claim 19, characterized in that the additional layer is a paper or cardboard layer or an oriented polymer film.
[0021]
21. Method according to claim 20, characterized in that the additional layer is a paper layer having a grammage of at least 20 g / m2.
[0022]
22. Method according to any one of claims 16 to 21, characterized in that it additionally comprises a step of providing a bonding layer between the additional layer and the volume layer.
[0023]
23. Method according to any one of claims 16 to 22, characterized in that the volume layer has a density of 100 to 600 kg / m3, such as from 100 to 500 kg / m3, such as from 200 to 500 kg / m3, such as from 300 to 500 kg / m3, such as from 300 to 400 kg / m3.
[0024]
24. Method according to any one of claims 16 to 22, characterized in that the volume layer has a surface weight grammage of at least 20 g / m2, such as at least 60 g / m2, such as between 60 and 250 g / m2.

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EP3148897B1|2018-08-15|

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ES2691524T3|2018-11-27|

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MX2016015282A|2017-04-05|

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RU2016151373A3|2018-12-03|

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WO2015181281A1|2015-12-03|

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法律状态:
2020-03-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-02-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/05/2015, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP14170393.4|2014-05-28|

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EP14170393.4A|EP2949597A1|2014-05-28|2014-05-28|Packaging material and packaging container|

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PCT/EP2015/061817|WO2015181281A1|2014-05-28|2015-05-28|Packaging material and packaging container|

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