WO2005120825A1 - 積層包装材料の製造方法 - Google Patents
積層包装材料の製造方法 Download PDFInfo
- Publication number
- WO2005120825A1 WO2005120825A1 PCT/JP2004/013330 JP2004013330W WO2005120825A1 WO 2005120825 A1 WO2005120825 A1 WO 2005120825A1 JP 2004013330 W JP2004013330 W JP 2004013330W WO 2005120825 A1 WO2005120825 A1 WO 2005120825A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin
- layer
- barrier
- packaging material
- producing
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/62—Boxes, cartons, cases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
Definitions
- the present invention relates to a method for producing a laminated packaging material having a non-layer applied to a core layer such as paper.
- a wrapping paper container for storing beverages such as milk, juice, and mineral water is obtained from a web-shaped laminated packaging material having a fold line and a printed external design.
- a web-like packaging laminated material is formed into a tube shape by a longitudinal vertical seal.
- the food is filled into the tubular packaging material.
- the final shape includes a brick shape and a regular tetrahedron shape.
- the laminated packaging material usually has an innermost layer of a thermoplastic material (a polyethylene resin layer), an aluminum foil layer of a noria layer, a paper core layer, and an outermost layer of a polyethylene resin.
- a thermoplastic material a polyethylene resin layer
- an aluminum foil layer of a noria layer a paper core layer
- an outermost layer of a polyethylene resin As the oxygen noria layer other than the aluminum foil, a single layer obtained by laminating an ethylene nouric copolymer (EVOH) or MXD6 nylon, which is an oxygen norea resin, or a barrier resin film is laminated. A multi-layer of co-extruded fat is used.
- a barrier solution obtained by dissolving an aqueous barrier resin such as polyvinyl alcohol resin or a copolymer resin of polyvinyl alcohol and ethylene (EVOH resin) in an aqueous solvent is used.
- An oil solution or a barrier resin solution obtained by dispersing a hydrophobic barrier resin in an aqueous dispersant is applied to a paper substrate by printing or the like, and then the solvent Z dispersant is dried. Then, there is a method of laminating a Noria layer on a substrate (core layer).
- an aqueous barrier composition is applied to a carrier film as a barrier layer, dried by heating and separated.
- a method for producing a laminated packaging material in which a powder or solvent is removed, a carrier film having a dry barrier layer is bonded and integrated with a core layer, and the dry barrier layer is heated and cured at a higher temperature. .
- Patent Document 1 JP-T-2003-508274
- Patent Document 2 International Publication No. 9809612
- An object of the present invention is to provide a method for producing a barrier laminate packaging material that does not require an adhesive, can simplify the structure of a laminate, and can reduce the thickness of the laminate.
- An object of the present invention is to provide a method for producing a Noria laminated packaging material which does not require a special apparatus such as a co-extrusion apparatus for producing a laminate.
- An object of the present invention is to provide a method for producing a barrier laminated packaging material that can obtain good barrier properties without using a smooth core layer.
- An object of the present invention is to provide a thin barrier that can be formed by stacking a certain thickness of noria layer.
- An object of the present invention is to provide a method for producing a barrier laminated packaging material in which no defects such as pinholes occur even in a layer.
- the method for producing a laminated packaging material of the present invention is a method for producing a laminated packaging material including a core layer, a barrier layer, and a thermoplastic resin layer,
- a barrier resin containing a dispersion or solution of a resin is applied to the core layer as a barrier layer, and the barrier layer is dried to remove a dispersant or a solvent in the resin. It is characterized in that a thermoplastic resin is extruded on one surface of a dry barrier to form a thermoplastic resin layer.
- the barrier resin is polyvinyl alcohol, ethylene-butyl alcohol copolymer, polyester, polyacrylic resin, polyphenoxy resin, epoxy resin, or a mixture thereof.
- the core layer is a paper substrate, a resin substrate, a composite substrate, a laminated substrate, or a combination thereof.
- the barrier resin solution is directly applied to the core layer.
- the thermoplastic resin layer is formed by extruding a co-extruded resin containing a thermoplastic resin on one surface of the dry barrier.
- the co-extruded resin contains a polyamide and EVOH.
- the thermoplastic resin is a low-density polyethylene obtained by using a multi-site catalyst and a linear low-density polyethylene obtained by using a Z or single-site catalyst. Len.
- the second method for producing a laminated packaging material according to the present invention includes a core layer, a barrier layer, and a paper substrate, a resin substrate, a composite substrate, or a laminated substrate, or a combination thereof. And a method for producing a laminated packaging material comprising a thermoplastic resin layer which is a low-density polyethylene with a multi-site catalyst and a linear low-density polyethylene obtained using a Z or single-site catalyst,
- thermoplastic resin melt-extruded on the surface of the no- ly layer to form the thermoplastic resin. Forming a layer.
- the barrier resin is a polyvinyl alcohol, an ethylene-vinyl alcohol copolymer, a polyester, a polyacrylic resin, a polyphenoxy resin, an epoxy resin or These are mixtures.
- the co-extruded resin contains polyamide and EVOH, and the co-extruded resin containing thermoplastic resin is extruded on one surface of the dry barrier to form the thermoplastic resin. A grease layer is formed.
- a polyalcohol-based resin such as a polyvinyl alcohol resin having oxygen nobility by itself or a copolymerized resin of polyvinyl alcohol and ethylene (EVOH resin) is dissolved.
- EVOH resin ethylene
- a coating liquid that is emulsified and dispersed on the paper substrate of the core layer and dry it to form a thin resin layer, and then extrude a thermoplastic resin without oxygen noria on it.
- a barrier material is obtained by stacking.
- the barrier laminated packaging material can be manufactured in a few steps.
- a coating solution (barrier resin solution) that is dissolved or emulsified and dispersed is applied to the paper base of the core layer, an adhesive is not required and the structure of the laminate is simplified. Thus, the thickness of the laminate can be reduced.
- a special apparatus such as a co-extrusion apparatus may be used for the production of the laminate, but is not an essential condition.
- the heat and pressure of the extrusion and the extrudate cause the Noria layer to soften and cover the entire unevenness of the core layer, and use a smooth core layer. Good noria can be obtained without it. That is, the base material surface is not required to be smooth, and any base paper generally used for paper packaging materials can be used without any problem.
- Extrusion of thermoplastic resin onto the applied Noria layer eliminates pinholes and other defects due to heat, pressure, and extruded material caused by extrusion.
- the noria resin layer before extrusion molding may have a pinhole or the like, and the noria resin layer may be extremely thin.
- thermoplastic resin By extruding the thermoplastic resin onto the applied Noria layer, the heat and pressure of the extrusion and the extrudate apply the aqueous dispersion or solution to the paper core layer and assume that water has permeated the fibers of the core layer. However, the water is quickly and easily evaporated away, which is undesirable in the core layer! / There is no danger of cracking.
- FIG. 1 shows steps of applying a Noria resin solution to a core layer and drying a barrier layer in the first embodiment of the present invention.
- the web 2 of the core layer for example paper, composite paper, synthetic paper, clay-coated paper, processed paper covered with a thin plastic layer, is unwound from the reel 2.
- the resin is passed through an applicator 3 (usually a liquid coating device) arranged adjacent to the unwound web 1, from which a noria resin solution is applied as a barrier layer to one surface of the core layer.
- the core layer web 1 After coating the core layer web 1, it passes through a drying device 4, such as an IR dryer or a hot air dryer, which acts on the coated side of the core layer web 1, for example at about 80-150 ° C. Remove the moisture at temperature and dry the applied barrier layer.
- the core layer web 1 with the applied barrier layer is wound up and then stored.
- the stored web 1 is sent to the next step according to the manufacturing method of the present invention to produce a laminated packaging material having excellent barrier properties.
- Post-processing with thermoplastic resin is performed on a separate line, using extrusion coating of polyethylene, etc. As a result, production costs can be significantly reduced compared to conventional oxygen-free materials.
- thermoplastic resin on one side of a dry barrier to form the thermoplastic resin layer without winding is performed. You may transition.
- FIG. 2 shows a step of forming a thermoplastic resin layer by extruding a thermoplastic resin on one surface of a dry barrier according to the first embodiment of the present invention.
- the core layer web 1 having a non-layered layer 1 is extruded on both sides of the web 1 using extruders 6 and 7 while simultaneously laminating thermoplastic resin, preferably polyethylene layers 8 and 9.
- the laminated packaging material 12 according to the present embodiment is obtained by passing through a gap between the rotating rollers 10 and 11 of the book.
- the laminated packaging material according to this embodiment has the cross-sectional structure schematically shown in Fig. 3.To make the paper packaging material waterproof and heat-sealable, both outer surfaces of the paper substrate are coated with polyethylene. It is common to do. Also in the present invention, polyethylene can be coated on the side of the paper base core layer opposite to the rear layer and used. This polyethylene coating is not required for oxygen nobility.
- the extrusion is performed in the same manner as the extrusion of a resin onto a general paper substrate.
- Surface treatment such as corona treatment on the paper base material may be performed as necessary.
- the extruder 6 on the side of the noria layer may be used to laminate the web to the noria layer.
- an oxygen-free laminate having three layers of extruded thermoplastic resin, such as a core layer Z, a barrier layer such as polyvinyl alcohol resin, and a three-layered extruded thermoplastic resin, is sealed three-sided with the thermoplastic resin layer inside. By doing so, it can be used as an oxygen barrier packaging material.
- the thermoplastic resin laminated on the noria layer of the web is not particularly limited.
- the linearity obtained using a site catalyst eg, (Linear) low-density polyethylene, or a blend polymer thereof. Sealability as a container, workability and packaging consider price on the material and the polyethylene desirability tool high-pressure and medium 'density 0.910 g / m 3 or more to be polymerized at low pressure method, is 0.960 g / m 3 or less of polyethylene used.
- the core layer is a paper substrate, a resin substrate, a composite substrate, a laminated substrate, or a combination thereof.
- Paperboard used as a paper base material is generally used as a raw material for packaging materials, and can be used as a packaging material, and has a basis weight (weight per unit area) of 150 g / m 2 or more and 400 g / m 2 or less. Things can be used. And the force to make Chikara ⁇ E the thin paper such Darashin paper of less than 30 g / m 2 or more 150 g / m 2 and in some cases is the thing that nag limited to this range, this other paper substrate, there have sheet It is also possible to perform lamination with a resin substrate such as a resin or a film.
- a resin substrate such as a resin or a film.
- a surface treatment such as a corona treatment or a flame treatment is performed at the time of paper processing.
- a surface treatment may be performed as required at the time of processing.
- the barrier resin is polyvinyl alcohol, ethylene-butyl alcohol copolymer, polyester, polyacrylic resin, polyphenoxy resin, epoxy resin, or a mixture thereof.
- the barrier resin is appropriately selected according to the type and use of the dispersant or solvent for the barrier resin solution.
- a high hydrogen bonding polymer having a hydrogen bonding group or an ionic group up to about 20% by weight or more of the polymer molecule is preferable.
- the polymer has functional hydroxyl groups, e.g., polyvinyl alcohol (PVOH), ethylene butyl alcohol (EVOH), polysaccharides such as starch, starch derivatives, carboxyl methylcellulose and other cellulose derivatives, You can choose from a mixture of two or more of them.
- a polymer having a nitrogen-containing group can also be used.
- the polybutyl alcohol-based resin means a resin obtained by saponifying a butyl group of a polymer obtained by homo- or copolymerizing ethyl acetate.
- Polyvinyl alcohol resin is a polyvinyl acetate resin obtained by polymerizing vinyl acetate monomer. This is a water-soluble resin obtained by saponifying the butyl group of hydroxyl-to-hydroxyl groups, and there are many types with different degrees of polymerization and saponification rates. The actual resin is not only adjusted for the degree of polymerization and saponification rate, but also various modifications are made to adjust the physical properties and processability, but the degree of polymerization is 500-2500 and the saponification rate is 69.5-99.85 mol%. Certain bur alcohol resins can be used.
- a copolymer of ethylene and vinyl alcohol a so-called EVOH resin
- This EVOH resin is also a barrier resin of the present invention, similarly to the polybutyl alcohol resin.
- EVOH resin with an ethylene content of 29-44 mol% is mixed with water and alcohol.
- a solution dissolved in a solvent is used as a coating solution (barrier resin solution).
- the barrier resin solution can be prepared by dispersing the barrier resin in a dispersant or dissolving it in a solvent.
- the dispersant and the solvent are aqueous.
- the coating solution is, for example, a solution obtained by dissolving a polybutyl alcohol-based resin in water or a mixed solvent of water and alcohol, and does not volatilize harmful organic solvents during the drying process. ⁇ Therefore, it is an excellent kajune method in terms of environment and safety.
- the coating liquid is not limited to the above, but a liquid obtained by dissolving or emulsifying and dispersing a resin in another solvent can also be used.
- the application can be carried out in the same process as printing such as spray coating of the solution Z dispersion and screen printing / gravure printing.
- printing such as spray coating of the solution Z dispersion and screen printing / gravure printing.
- a transfer method using a gravure roll processing can be continuously and efficiently performed.
- the solution Z dispersion is thinly transferred to a transfer port, and the resin is transferred to the paper base by bringing the roll into close contact with the surface of the paper base.
- the laminated packaging material 12 according to the first embodiment of the present invention has a cross-sectional structure schematically shown in FIG.
- the laminated packaging material 12 comprises an extruded thermoplastic resin innermost layer 8, a barrier resin layer 15 for directly applying a barrier resin liquid to the core layer, a core layer 1, and a simultaneously extruded thermoplastic resin. It consists of the outermost layer 9 of fat.
- thermoplastic resin outermost layer 9 which is coated with polyethylene on the outer surface when formed into a container, can be used in the same manner as commonly used paper processing and packaging materials. For the purpose of further improving the performance, a more general barrier resin laminating process may be performed. Alternatively, a paper substrate coated with a polyvinyl alcohol-based resin may be used as a raw material, and multi-layer processing may be performed thereon.
- the thermoplastic resin layer can be formed by extruding a co-extruded resin containing a thermoplastic resin on one surface of the dry barrier.
- the co-extruded resin contains polyamide and EVOH, and can be co-extruded with polyamide Z adhesive Z polyethylene thermoplastic resin or EVOH / adhesive / polyethylene thermoplastic resin.
- an inorganic flaky compound or a clay mineral can be added to the barrier resin solution.
- the inorganic flaky conjugate a so-called nanoparticle compound
- the lamellar lamellar inorganic compounds are separated from each other by a liquid medium.
- “Clay minerals” include minerals of the olivine, antigolite, smectite, vermiculite, and mica types, respectively.
- the core layer and the barrier layer made of a paper substrate, a resin substrate, a composite substrate, or a laminated substrate, or a combination of these substrates
- a method for producing a laminated packaging material comprising a thermoplastic resin layer which is a low-density polyethylene with a multi-site catalyst and a linear low-density polyethylene obtained using a Z or single-site catalyst,
- a Noria resin solution containing a dispersion or solution of Noria resin is directly applied as a Noria layer to the core layer, and a thermoplastic resin is melt-extruded on the surface of the Noria layer to form a thermoplastic resin.
- a grease layer is formed.
- FIG. 4 shows specific steps in the second embodiment.
- a core layer web 1 of a paper base material is coated on the base material with a coating solution of a poly (vinyl alcohol) resin from a coating device 3, and a thermoplastic resin 8 is further formed on the resin layer by an extrusion device 6.
- a packaging material is obtained.
- a single drying step can be omitted. Drying can divert the process heat in the melt extrusion process, enabling efficient production.
- the oxygen barrier property of the material is evaluated according to JIS K-7126. Specifically, the measurement is carried out using an oxygen permeation measuring device Oxtran manufactured by Mocon. Unlike physical barrier layers such as aluminum foil, the oxygen noria of resin-based noria has temperature and humidity dependence, so measurement conditions should be set as necessary. Generally oxygen permeability force 0 CC / m 2 .day in. A tm following materials a container having practically oxygen barrier property if the container formed with the idea we are by using, because, In the present invention, 50 cc / m 2 .day.atm was used as a criterion for determining the presence or absence of oxygen permeability. Therefore, based on the above results, noria properties cannot be obtained simply by applying the nori resin solution and drying.
- a packaging material was obtained in the same manner as in Example 1, except that the low-density polyethylene of 20 g / m 2 was extruded on the Noria layer.
- Oxygen permeability is 0.2 is cc / m 2 24hr atm, compared simply 960 cc / m 2 .day.atm materials coated dried Noria ⁇ liquid, and a 1172 cc / m 2 24hr atm of Comparative Example 1 As a result, it can be seen that the oxygen noria property is dramatically improved.
- the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.
- the method for producing a laminated packaging material of the present invention can produce packaging containers for beverages such as milk, juice, and mineral water, and liquid foods.
- FIG. 1 is a process chart showing application of a Noria resin solution to a core layer and drying of a barrier layer according to the first embodiment of the present invention.
- FIG. 2 is a process chart showing a step of extruding a thermoplastic resin on one layer of a dry barrier to form a thermoplastic resin layer in the first embodiment of the present invention.
- FIG. 3 is a cross-sectional view schematically illustrating a laminated packaging material according to a first embodiment of the present invention.
- FIG. 4 is a process chart showing the steps of the method for producing a laminated packaging material according to the second embodiment of the present invention.
- Web reel coating machine drying equipment
Landscapes
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2006514402A JPWO2005120825A1 (ja) | 2004-06-14 | 2004-09-13 | 積層包装材料の製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-174959 | 2004-06-14 | ||
JP2004174959 | 2004-06-14 |
Publications (1)
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WO2005120825A1 true WO2005120825A1 (ja) | 2005-12-22 |
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PCT/JP2004/013330 WO2005120825A1 (ja) | 2004-06-14 | 2004-09-13 | 積層包装材料の製造方法 |
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WO (1) | WO2005120825A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007253615A (ja) * | 2006-02-22 | 2007-10-04 | Nippon Synthetic Chem Ind Co Ltd:The | 積層構造体 |
JP2009113254A (ja) * | 2007-11-04 | 2009-05-28 | Nihon Tetra Pak Kk | 積層包装材料及びその製造法 |
SE2230223A1 (en) * | 2022-07-07 | 2024-01-08 | Stora Enso Oyj | Paper or paperboard based packaging laminate having a gas barrier with an extruded evoh layer |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000502976A (ja) * | 1995-12-20 | 2000-03-14 | テトラ ラバル ホールデイングス エ フイナンス ソシエテ アノニム | 積層包装材料と、積層包装材料を製造する方法と、積層包装材料から製造された包装容器 |
JP2000177067A (ja) * | 1998-10-07 | 2000-06-27 | Kuraray Co Ltd | 共押出コ―ティングしてなる多層構造体およびその製法 |
-
2004
- 2004-09-13 JP JP2006514402A patent/JPWO2005120825A1/ja not_active Withdrawn
- 2004-09-13 WO PCT/JP2004/013330 patent/WO2005120825A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000502976A (ja) * | 1995-12-20 | 2000-03-14 | テトラ ラバル ホールデイングス エ フイナンス ソシエテ アノニム | 積層包装材料と、積層包装材料を製造する方法と、積層包装材料から製造された包装容器 |
JP2000177067A (ja) * | 1998-10-07 | 2000-06-27 | Kuraray Co Ltd | 共押出コ―ティングしてなる多層構造体およびその製法 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007253615A (ja) * | 2006-02-22 | 2007-10-04 | Nippon Synthetic Chem Ind Co Ltd:The | 積層構造体 |
JP2009113254A (ja) * | 2007-11-04 | 2009-05-28 | Nihon Tetra Pak Kk | 積層包装材料及びその製造法 |
SE2230223A1 (en) * | 2022-07-07 | 2024-01-08 | Stora Enso Oyj | Paper or paperboard based packaging laminate having a gas barrier with an extruded evoh layer |
WO2024009150A1 (en) * | 2022-07-07 | 2024-01-11 | Stora Enso Oyj | Polymer coated paper and paperboard |
SE546122C2 (en) * | 2022-07-07 | 2024-05-28 | Stora Enso Oyj | Paper or paperboard based packaging laminate having a gas barrier with an extruded evoh layer |
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JPWO2005120825A1 (ja) | 2008-04-10 |
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