• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A packaging material (1) comprising a carrier layer (2) made of aluminum and a lacquer layer (3) with excellent opening behavior applied thereto is characterized in that the lacquer of the lacquer layer (3) consists of a solvent, a binder and a plasticizer, wherein a polymeric binder having a molecular weight of at least 80,000 daltons, preferably at least 100,000 daltons is used and by the mixing ratio between solvent, binder and plasticizer a bond between paint layer (3) and carrier layer (2) in the range of 0.07 N / 50mm and 0.30 N / 50mm and an elongation at break of the paint layer (3) of at least 150% is set.
    公开号:AT518640A4
    申请号:T50994/2016
    申请日:2016-10-28
    公开日:2017-12-15
    发明作者:
    申请人:Constantia Teich Gmbh；
    IPC主号:
    专利说明:

    Packaging material made of painted aluminum
    The subject invention relates to a packaging material of a support layer made of aluminum and an at least partially applied thereto lacquer layer.
    In the food sector, especially in the packaging of seasonal goods such as chocolate Easter eggs, chocolate Easter bunnies, etc., often wrap packaging based on printed aluminum foils are used. The printed side is outboard and the outside may still be coated to protect the printed image (e.g., with a polypropylene film). Every consumer of such goods in a wrapped package knows the problem that such a package, or a desired or intended part thereof, can sometimes be very difficult to remove from the contents. When unpacking the contents, it is often the case that the wrapping package tears into small pieces and can not be removed as a whole. For chocolate bars, which are wrapped in aluminum foil, you will often want to unpack the chocolate bar only partially. Often the similar problem arises that the removing aluminum foil can not or only with difficulty, and above all not remove as a whole part, because this in turn tears in small parts. This is of course disturbing and frustrating for the consumer. For cost reasons, the wrapping package should of course be made as thin as possible. A larger thickness of the wrapper is therefore usually no solution to this problem.
    It is therefore an object of the present invention to provide a packaging material that can be used in particular as a wrapper and that ensures excellent opening behavior of a package produced by an uncontrolled tearing of the packaging material is prevented during manual opening as far as possible.
    This object is achieved in that the lacquer of the lacquer layer consists of a solvent, a binder and a plasticizer, wherein a polymeric binder having a molecular weight of at least 80,000 daltons, preferably at least 100,000 daltons, is used and by the mixing ratio between solvent, binder and Plasticizer is a composite adhesion between the paint layer and backing layer in the range of 0.07 N / 50mm and 0.30 N / 50mm and an elongation at break of the paint layer of at least 150% is set. The bond adhesion, which is set lower than usual, ensures that the thin lacquer layer does not entrain with the aluminum when the aluminum is cracked, but separates from the aluminum of the carrier layer and then serves as reinforcement of the aluminum layer. For this purpose, the lacquer layer has a sufficiently high elongation at break, whereby the lacquer layer can be considerably stretched before it breaks. In this way, the packaging material according to the invention offers an excellent opening behavior, whereby tearing of the packaging material during opening in the region of the lacquer layer can be prevented.
    This can be on a package with such a packaging material, in particular by partial application of the lacquer layer, also realize advantageous functions that facilitate the handling of the package, in particular the opening of the package. For example, an opening aid can thus be formed by eliminating the lacquer layer, along which a package can be safely and selectively opened. Similarly, a tear line can be formed by partial application, along which a package can be safely and selectively opened.
    10 to 50% by weight of binder, 1 to 30% by weight of plasticizer and 20 to 80% by weight of solvent are preferably present in the paint. In these areas, the bond strength and the elongation at break can be set very advantageously.
    If an additive is additionally contained in the paint, certain properties of the packaging material can be influenced in a targeted manner. In particular, the additive can influence the composite adhesion, ie increase, in this case, the additive is a bonding agent, or lower. These are preferably in the paint 0 to 5 wt.% Contained additive.
    The subject invention will be explained in more detail with reference to Figures 1 to 4. These show by way of example, schematically and not restrictively in FIG
    1 shows the structure of a packaging material according to the invention,
    2 shows a packaging for seasonal goods with a packaging material according to the invention,
    3 shows a packaging with a packaging material according to the invention with opening aid and
    4 shows a packaging with a packaging material according to the invention with a tear strip.
    The packaging material 1 according to the invention for a wrapping package, as shown in Figure 1, has a carrier layer 2 made of aluminum. The thickness of the support layer 2 made of aluminum is for the objective application in the range of 5 - 20pm, preferably 5 -10pm. On at least one side of the carrier layer 2, a lacquer layer 3 is applied, which has a thickness in the range of 5 - 15pm.
    As a varnish for the varnish layer 3, a mixture of a binder, a plasticizer and a solvent is used. 10 to 50% by weight (percent by weight) of binder, 1 to 30% by weight of plasticizer and 20 to 80% by weight of solvent are present in the paint. Furthermore, in small amounts, 0 to 5 wt.%, Additives, such as adhesion promoters may be provided.
    The lacquer layer 3 must have special properties in order, in combination with the aluminum support layer 2, to produce a packaging material 1 which meets the requirements. Investigations by the Applicant have shown that in particular two properties are decisive for this purpose.
    First, it depends on the bond between the support layer 2 made of aluminum and the paint layer 3. It is obvious that there must be minimal composite adhesion, otherwise unwanted delamination would occur, thereby separating the two layers. However, it was surprisingly found that the composite adhesion may not be too large. If you pull on the packaging material 1, which is equivalent to the situation when opening a package with such a packaging material 1, eventually tears the aluminum of the support layer 2. If the bond between the support layer 2 made of aluminum and the lacquer layer 3 too large, the lacquer layer 3 would entrain, because the lacquer of the lacquer layer 3 is applied very thinly, which would result in a substantially unchanged opening behavior compared to the known packaging materials. The Applicant's investigations have shown that the bond strength between the aluminum support layer 2 and the lacquer layer 3 must be in the range of 0.07 N / 50 mm and 0.30 N / 50 mm. This can ensure that the lacquer layer 3 does not entrain with the aluminum of the carrier layer 2.
    However, the bond strength alone is not sufficient to achieve the desired properties of the packaging material 1. In addition, the lacquer layer 3 must be sufficiently tough to prevent cracking of the lacquer layer 3, despite the low layer thicknesses. This ensures that the aluminum of the support layer 2 can tear, while the lacquer layer 3 is still intact and not entrained. The lacquer layer 3 thus serves as a kind of reinforcing lacquer for the carrier layer 2 made of aluminum.
    Only the bond strength in the specified range in combination with the toughness ensures that the opening behavior of the packaging material 1 has the desired properties.
    The bond strength is measured with a composite adhesion test / separation test of the layers according to the DIN 53357 standard. The test is carried out e.g. on a tensile tester from Zwick. The carrier layer 2 and the lacquer layer 3 of the packaging material 1 are partially separated, clamped separately in the tensile tester and further pulled apart and measured the force required to pull apart. The parameters for the separation test are a sample width of 50 mm (hence the unit N / 50 mm), a take-off speed of 100 mm / min, a clamping length of the carrier layer 2 and the lacquer layer 3 of max. 50mm and a take-off angle of 90 °. The tensile strength measuring device determines the extreme values as well as the mean values of the force required for stripping in N / 50mm, where the extreme value is specified here.
    The composite adhesion is adjusted above all by the paint formulation, wherein in particular the binder, and any adhesion promoter present as an additive, influence the adhesion to the aluminum of the carrier layer 2.
    In order to achieve the high toughness, a high molecular weight, polymeric binder with high internal cohesion is used according to the invention for the lacquer of the lacquer layer 3. As a measure of the internal cohesion of the binder, the molecular weight M of the binder is used. The higher the internal cohesion, the tougher and more stretchable the paint and the later the paint tears. It has been found that the molecular weight of the binder must be at least 80,000 daltons, preferably at least 100,000 daltons, in order to achieve the desired material properties of the packaging material 1. Usually, the molecular weight is a manufacturer's indication of the manufacturer of the binder.
    The molecular weight is measured, for example, by the known method of gel permeation chromatography and a suitable molar mass standard or mass spectrometry. The molecular mass standard used is the polystyrene standard which is widely used in industry. When using the gel permeation chromatography, the binder is dissolved, for example, introduced into the separation column of the gel permeation chromatography instrument with tetrahydrofuran and the refractive index is measured using a refractive index detector (RI detector). From the refractive index can be deduced the molecular weight M.
    As a measure of the toughness of the lacquer layer 3, the elongation at break of the lacquer layer 3 is used. For this purpose, a paint film is produced with a uniform thickness as possible and only this paint film subjected to a tensile test according to the standard ISO 527-1. The elongation at break in%, and optionally also the tensile strength in N / mm 2, of the lacquer layer is measured. The tensile test is carried out as follows: The prepared sample of the lacquer layer (100 × 15 mm) is loaded on the towing vehicle until it breaks with a tensile force. The sample is clamped in the tension gauge so that the longitudinal axis of the sample coincides with the line of action of the tensile force. The zero position of the traction and the path must be checked and ensured before the start of the tensile test. The required strain rate is set to 100 mm / min. The sample elongation is taken over the path measuring range of the tension gauge. For use in a packaging material 1 according to the invention, the lacquer or a lacquer film produced therefrom should have an elongation at break of at least 150% in the desired thickness range of 5 to 15 pm. The elongation at break thus also influences the possible thickness of the lacquer layer 3 for a given lacquer formulation. For the packaging material 1 according to the invention, high molecular weight, polymeric binders based on thermoplastic materials, such as e.g. a styrene-butadiene-styrene (SBS), polyvinyl acetate (PVA), polyvinyl chloride (PVC) or a polyvinyl alcohol (PVOH), based on epoxides, based on polyester resins or based on acrylates in question. The use of different binder combinations (also as co-polymers) in the paint is also conceivable.
    As, preferably low molecular weight (molecular weight <1000 daltons), plasticizer is according to the invention a monomer plasticizer, such. Dioctyl adipate (DOA), dibutyl sebacate (DBS), acetyl tributyl citrate (ATBC), epoxidized soybean oil (ESO), etc., or a polymeric plasticizer, such as e.g. Polyester, polyurethanes, castor oil, acrylates, alkyd resins, etc. used. The ratio of the plasticizer to the binder also influences the toughness of the lacquer layer 3. Too much plasticizer causes the lacquer to be too soft and thus the lacquer layer no longer has any strength. It can be used in the paint and various plasticizers.
    Suitable solvents according to the invention methyl ethyl ketone (MEK), acetone, ethyl acetate, ethanol or water in question. Of course, the solvent must be compatible with the binder and the plasticizer as well as the optional additives. In addition, the choice of solvent is also dependent on the desired application method, the drying characteristics and the dry layer thickness of the lacquer layer 3.
    As the most prominent additive, an additional primer may be added to enhance the adhesive properties of the binder to aluminum. As a possible adhesion promoter, a polyurethane-based adhesive may be used. However, an additive can also be used to reduce excessive adhesion. Further typical additives are hydroxy- or carboxy-functionalized acrylates, polyurethanes, polyvinyl chlorides, polyesters, epoxides and silanes, titanates, zirconates, polyethylenimines, phosphoric esters, sucrose derivatives, chlorinated polyolefins, silicones (all as adhesion promoters or adhesion promoters) or fillers, such as e.g. Talc or silica. Of course, several different, and also further, additives may be buried.
    In order to obtain a suitable lacquer for the lacquer layer 3, the procedure is, for example, as follows. First, the binder is selected according to the application. Then, a compatible for the selected binder solvent is selected, which also allows the selected application method of the paint on the carrier layer 2. Likewise, a compatible plasticizer is selected. For an application in the food industry, all components of the paint must of course be food contact, e.g. for Europe in accordance with EU Directive 1935/2004 / EC, be safe. About the proportions of binder, plasticizer and solvent, the toughness (elongation at break of a paint film) of the paint is adjusted, which can be controlled by tensile tests. The bond strength of the paint on aluminum is adjusted by the proportions of binder, plasticizer and solvent and tested by means of a separation test. The bond adhesion can be influenced by admixing an additive. The adjustment of the proportions of binder, plasticizer and solvent can also be repeated in several iterations in order to achieve the desired properties of the packaging material 1.
    Below are given as exemplary embodiments, two possible paint formulations. Substances are given in their general substance name without a specific source of supply, while commercially available products are indicated with type designation and source of supply.
    Paint 1:
    Solvent 74.42% by weight MEK
    Binder 14.88% by weight of Vinnol H11 / 59 from Wacker Chemie AG. It is a co-polymer of vinyl chloride and vinyl acetate. The molecular weight M measured by gel permeation chromatography and a polystyrene standard is between 80,000 and 120,000.
    Plasticizer 5.58% by weight Dynapol LS 615 (a polyester resin) from Evonik Industries AG and 2.33% by weight Rokralux VP 5797 (an alkyd resin) from Robert Kraemer GmbH &amp; Co. KG.
    Additive 2.79% by weight of Adcote 811 A (a polyurethane-based adhesive) from Rohm &amp; Haas as a bonding agent.
    Paint 2:
    Solvent 76.56% by weight MEK
    Binder 15.31 wt.% Vinnol H11 / 59 (co-polymer of vinyl chloride and vinyl acetate) from Wacker Chemie AG.
    Plasticizer 5.74% by weight Dynapol LS 615 (a polyester resin) from Evonik Industries AG and 2.39% by weight Rokralux VP 5797 (an alkyd resin) from Robert Kraemer GmbH &amp; Co. KG.
    The bond adhesion test for varnish 1 gave a value of 0.26 N / 50 mm for bond adhesion and 0.08 N / 50 mm for varnish 2.
    The effect of the lacquer as a lacquer layer 3 on a support layer 2 made of aluminum is documented by a tensile test according to the standard ISO 527-1, wherein the tensile strength in N / mm2 and the elongation at break in% were measured. In this case, a carrier layer 2 with a layer thickness of 6.7 pm and a lacquer layer 3 with a grammage of 12.5 g / m 2 (resulting in a density of the lacquer of about 900 kg / m 3, a layer thickness of about 13.9 pm) is used. The test is carried out as described above, using as sample a packaging material 1 (100 × 15 mm).
    As a comparison, the tensile test is also carried out on the support layer 2 made of aluminum without lacquer layer 3 and on a support layer 3 with a heat sealing lacquer (HSL), for example, a heat sealing lacquer with the product number 58357000020 Fa. Constantia pond. The results are summarized in the table below.
    From the above table, the effect is immediately apparent. Conventional materials have a very low elongation at break, which causes the material to tear very rapidly when put on, even if the tensile strength of the packaging material is in a similar range to a packaging material 1 according to the invention (for example, as for backing + HSL). On the other hand, a packaging material 1 according to the invention has a significantly higher elongation at break, which due to the low bond strength can also be utilized. Tearing of the carrier layer 2 thus does not immediately lead to the tearing of the packaging material 1, but the lacquer layer 3 reinforces the packaging material 1 with regard to the opening property. This effect was also confirmed on a test basis when used as a wrapper for seasonal goods. The seasonal goods could be opened easily with the packaging material 1 according to the invention.
    The elongation at break can not be measured for a heat-sealable lacquer, since it can not be used to produce a film and thus no sample for a tensile test.
    In a conventional packaging material with a support layer made of aluminum and a lacquer layer of heat sealing lacquer (HSL), the adhesion between aluminum and lacquer is so high that the lacquer layer can not be separated from the aluminum at all, at least not non-destructive.
    In contrast, in a conventional laminated packaging material, for example of the type paper / aluminum or plastic / aluminum, where a material layer is laminated to an aluminum, the bond adhesions obtained are typically at least 0.7 N / 50 mm and go up to 30 N / 50mm, so are significantly above the range of the invention.
    The tensile strength of the packaging material 1 is, of course, so high that it can be pulled on the packaging material 1 when used as a wrapping package, without it ruptures immediately.
    The lacquer layer 3 is preferably applied to the carrier layer 2 in a liquid form by a rotary process, for example a roller-painting process, or by a slot-jet coating process. The solvent of the paint is evaporated, causing the paint as a lacquer layer 3 filmed on the support layer 2. Evaporation may be assisted by appropriate heating or irradiation (e.g., UV or IR irradiation).
    Alternatively, the lacquer layer 3 can also be applied to the carrier layer 2 in an extrusion process.
    The carrier layer 2 can also be printed on the surface facing the lacquer layer 3 before applying the lacquer layer 3. The pressure is then protected by the lacquer layer 3 at the same time. For this purpose, the carrier layer 2 can also be painted before printing with a Druckvorlack. In the case of a paint with water as a solvent, the printing precursor may be both water-based or non-water-based. As a rule, water has no sufficient solvent power to dissolve the dried printing precursor, which would lead to a connection between the printing precursor and lacquer of the lacquer layer in the liquid phase and thus to a solid compound. In the case of a paint with a solvent other than water, however, the Druckvorlack must be water-based, because the solvent-based paint of the paint layer 3 with the water-based Druckvorlack not sufficiently connects and thus the adhesion properties are not changed. The situation would be different for a solvent-based printing primer, since the solvent-based varnish of the varnish layer 3 would dissolve the printing precursor and a connection would take place in the liquid phases, which would change the adhesion properties in the packaging material 1. Under the above conditions, the aluminum carrier
    Layer 2 with a Druckvorlack and the printing with the lacquer layer 3 according to the invention substantially the same as a bare aluminum surface. Such a packaging material 1 would also have the desired behavior.
    The packaging material 1 according to the invention is used, for example, as a wound package 10 for seasonal goods, such as a chocolate Easter egg, as shown in FIG. 2, wherein the lacquer layer 3 is arranged facing away from the packaged product. In such applications, the lacquer layer 3 is advantageously applied over the entire surface of the carrier layer 2.
    Of course, it is possible to apply the lacquer layer 3 according to the invention only partially to the carrier layer 2. This makes it possible to realize various functions in a packaging 10 with the packaging material 1.
    For example, the lacquer layer 3 could be recessed at certain areas of the packaging material 1. Thus, the packaging material 1 tears at these recessed areas lighter than at areas with lacquer layer 3. The recessed areas can be arranged on a package 10 of a packaging material 1 so that thereby forms an opening aid 4, as in Figure 3 the example a packaging of a chocolate bar shown. If the consumer pulls on the part of the packaging material 1 with lacquer layer, the packaging 10 formed in this way will tear at the points without lacquer layer 3, ie in the area of the opening aid 4. The lacquer layer 3 at the other areas ensures that the packaging material 1 can be separated cleanly from the packaged good and in particular does not tear in these areas.
    It is irrelevant whether the lacquer layer 3 is applied over the entire surface and subsequently, for example by means of laser, is removed at the desired locations, or whether the lacquer layer 3 is applied only at the intended locations on the support layer 2. In order to facilitate or improve the laser processing, a laser-sensitive or laser-absorptive substance may also be contained as an additive in the lacquer or in the lacquer layer 2. Such substances and their use are known per se.
    However, the properties of the lacquer layer 3 can also be used to specifically form a tear line 5, as exemplified in FIG. Also for this purpose, the lacquer layer 3 is only partially applied to the carrier layer 2 and that in the areas that form the tear line 5. The varnish layer 3 ensures that, when pulled on the tear line 5, preferably on a formed flap 6, by the consumer, it is neatly separated from the rest of the packaging material 1 and a package 10, e.g. a bag as in Figure 4, clean along the tear line 5 can be opened.
    It is understood that both an opening aid 4 and a tear-5 can be provided at any designated location of a package 10 and in any desired geometric shape.
    权利要求:
    Claims (7)
    [1]
    claims
    1. Packaging material made of a support layer (2) made of aluminum with a layer thickness in the range of 5 - 20pm, preferably 5 - 10pm, and an at least partially applied thereon lacquer layer (3) with a layer thickness in the range 5 - 15pm, wherein the lacquer of the lacquer layer (3) consists of a solvent, a binder and a plasticizer, wherein a polymeric binder having a molecular weight of at least 80,000 daltons, preferably at least 100,000 daltons is used, and by the mixing ratio between solvent, binder and plasticizer, a bond between lacquer layer (3) and carrier layer (2) in the range of 0.07 N / 50mm and 0.30 N / 50mm and an elongation at break of the lacquer layer (3) of at least 150% is set.
    [2]
    2. Packaging material according to claim 1, characterized in that the lacquer layer (3) over its entire surface on the carrier layer (2) is applied.
    [3]
    3. Packaging material according to claim 1 or 2, characterized in that in the paint 10 to 50 wt.% Binder, 1 to 30 wt.% Plasticizer and 20 to 80 wt.% Solvent are included.
    [4]
    4. Packaging material according to one of claims 1 to 3, characterized in that the paint is an additive, preferably an adhesion promoter for improving the adhesion to aluminum, is included.
    [5]
    5. Packaging material according to claim 4, characterized in that in the paint 0 to 5 wt.%, Additive is included.
    [6]
    6. Packaging of a packaging material (1) according to one of claims 1 to 5, characterized in that on the package (10) by areas without lacquer layer (3) an opening aid (4) is formed.
    [7]
    7. Packaging from a packaging material (1) according to one of claims 1 to 5, characterized in that on the package (10) through areas with lacquer layer (3) a tear strip (5) is formed.
    类似技术:
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    DE1569873A1|1969-07-31|Adhesive
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    同族专利:
    公开号 | 公开日
    AT518640B1|2017-12-15|
    WO2018001827A1|2018-01-04|
    EP3475350A1|2019-05-01|
    US20190315540A1|2019-10-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT162114B|1945-11-03|1949-01-25|Brueder Teich|Aluminum foil coated with polyvinyl chloride for packaging butter.|
    US4834245A|1988-08-05|1989-05-30|Kabushiki Kaisha Hosokawa Yoko|Pouch having tearing zone for taking out content packed therein|
    US7390851B1|2003-01-06|2008-06-24|Loctite Limited|Toughened cyanoacrylate compositions|
    DE202006016691U1|2006-10-31|2007-01-04|Hueck Folien Gmbh & Co. Kg|Packaging foil for packing chocolate-Easter bunny figure, has composite film in the form of aluminum foil with plastic foil or plastic film made of polypropylene, polyester and polyethylene terephthalate|
    EP2583910A1|2011-10-21|2013-04-24|Amcor Flexibles Italia S.R.L.|Packaging with tearing aid|AT522483B1|2019-07-30|2020-11-15|Constantia Teich Gmbh|Packaging material made of painted aluminum|
    USD942112S1|2020-06-16|2022-02-01|Jason Toombs|Confection with multicolor pattern|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT505772016|2016-06-27|US16/313,507| US20190315540A1|2016-06-27|2017-06-21|Packaging material made of lacquered aluminum|
    PCT/EP2017/065261| WO2018001827A1|2016-06-27|2017-06-21|Packaging material made of varnished aluminum|
    EP17732094.2A| EP3475350A1|2016-06-27|2017-06-21|Packaging material made of varnished aluminum|
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