WO2023042805A1 - 易開封性包装材及び包装袋 - Google Patents
易開封性包装材及び包装袋 Download PDFInfo
- Publication number
- WO2023042805A1 WO2023042805A1 PCT/JP2022/034093 JP2022034093W WO2023042805A1 WO 2023042805 A1 WO2023042805 A1 WO 2023042805A1 JP 2022034093 W JP2022034093 W JP 2022034093W WO 2023042805 A1 WO2023042805 A1 WO 2023042805A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- packaging material
- paper
- easy
- anchor coat
- Prior art date
Links
- 239000005022 packaging material Substances 0.000 title claims abstract description 122
- 238000004806 packaging method and process Methods 0.000 title claims description 24
- 239000000565 sealant Substances 0.000 claims abstract description 58
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000007740 vapor deposition Methods 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 5
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 183
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 37
- 229920005989 resin Polymers 0.000 claims description 35
- 239000011347 resin Substances 0.000 claims description 35
- 239000012790 adhesive layer Substances 0.000 claims description 24
- 150000003839 salts Chemical class 0.000 claims description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 15
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 15
- 239000000123 paper Substances 0.000 description 64
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 27
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 27
- 239000007788 liquid Substances 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 230000004888 barrier function Effects 0.000 description 22
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- 238000000576 coating method Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 19
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 18
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- 238000000151 deposition Methods 0.000 description 16
- 150000001875 compounds Chemical class 0.000 description 14
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- -1 urethane compound Chemical class 0.000 description 10
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 9
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 9
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 9
- 235000019441 ethanol Nutrition 0.000 description 9
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 9
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 229920002635 polyurethane Polymers 0.000 description 8
- 239000004814 polyurethane Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 6
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 6
- 150000001733 carboxylic acid esters Chemical class 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 229920000092 linear low density polyethylene Polymers 0.000 description 6
- 239000004707 linear low-density polyethylene Substances 0.000 description 6
- 229920002647 polyamide Polymers 0.000 description 6
- 229920000098 polyolefin Polymers 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 5
- 229920005749 polyurethane resin Polymers 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 3
- 229920000877 Melamine resin Polymers 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 3
- 229920002396 Polyurea Polymers 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 125000005396 acrylic acid ester group Chemical group 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000001244 carboxylic acid anhydrides Chemical group 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000009820 dry lamination Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 3
- 229920000554 ionomer Polymers 0.000 description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 150000007514 bases Chemical class 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
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- 239000011342 resin composition Substances 0.000 description 1
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- 239000002356 single layer Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 125000006839 xylylene group Chemical group 0.000 description 1
Images
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
-
- 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
- B32B27/10—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 of paper or cardboard
-
- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Definitions
- This disclosure relates to easy-open packaging materials and packaging bags.
- Patent Document 1 a paper substrate, an adhesive layer containing a specific material, a metal layer in contact with the adhesive layer, and a sealant layer are laminated in this order, and the thickness of the adhesive layer is specified.
- a packaging material is disclosed that ranges from Patent Document 2 discloses a packaging material in which a paper substrate, an adhesive layer in contact with the paper substrate, and a sealant layer are laminated in this order, and the arithmetic average roughness of the paper substrate and the packaging
- a packaging material is disclosed whose tensile strength satisfies a specific conditional expression.
- the fibers of the paper base material have orientation, but when the direction of tearing is not along the orientation direction of the fibers of the paper base material, tearability is poor. was clarified by the studies of the present inventors.
- the present disclosure provides an easy-open packaging material and a packaging bag that have excellent tearability regardless of the tearing direction even if they do not have a notch, have excellent water vapor barrier properties, and are environmentally friendly.
- An easy-open packaging material is a packaging material having a laminated structure comprising a paper substrate, an anchor coat layer, a metal or metal oxide deposition layer, and a sealant layer in this order.
- the weight of the paper base material is 50% by mass or more based on the entire packaging material, the thickness of the sealant layer is 2 to 40 ⁇ m, the sealant layer contains the first polyolefin resin, Tensile breaking strength is 40 to 70 N/15 mm.
- the first polyolefin-based resin may have at least one selected from the group consisting of carboxyl groups and salts of carboxyl groups.
- the thickness of the sealant layer may be 2 to 20 ⁇ m.
- An adhesive layer may be further provided between the vapor deposition layer and the sealant layer.
- a second polyolefin resin further comprising an overcoat layer between the vapor deposition layer and the adhesive layer, wherein the overcoat layer contains at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group. may contain
- the anchor coat layer may contain a third polyolefin resin having at least one selected from the group consisting of carboxyl groups and salts of carboxyl groups.
- the anchor coat layer may contain a polyvinyl alcohol-based resin.
- Another aspect of the present disclosure may be a packaging bag including the easy-open packaging material.
- the packaging bag may have a folded portion.
- an easy-open packaging material and a packaging bag that have excellent tearability regardless of the tearing direction even if they do not have a notch, have excellent water vapor barrier properties, and are environmentally friendly. .
- FIG. 1 is a schematic cross-sectional view showing an easy-open packaging material according to an embodiment of the present disclosure
- FIG. FIG. 4 is a schematic cross-sectional view showing an easy-open packaging material according to another embodiment of the present disclosure
- 1 is a perspective view of a packaging bag according to an embodiment of the present disclosure
- FIG. 1 is a schematic cross-sectional view showing the packaging material according to the first embodiment.
- a packaging material 10 according to one embodiment has a laminated structure including a paper substrate 1, an anchor coat layer 2, a vapor deposition layer 3, and a sealant layer 4 in this order.
- the paper base material 1 is not particularly limited, and may be appropriately selected according to the use of the packaging bag to which the packaging material 10 is applied. There is no particular limitation as long as the paper is mainly composed of plant-derived pulp. Specific examples of the paper substrate 1 include woodfree paper, special woodfree paper, coated paper, art paper, cast coated paper, imitation paper, kraft paper, and glassine paper.
- the basis weight of the paper base material 1 is, for example, 20 g/m 2 or more, 30 g/m 2 or more, 35 g/m 2 or more, or 40 g/m 2 or more, because it is more excellent in tearability. m 2 or less, 300 g/m 2 or less, or 100 g/m 2 or less.
- the paper substrate 1 may be provided with a coat layer at least on the side in contact with the anchor coat layer 2 described later.
- a coat layer By providing a coat layer, it is possible to prevent the anchor coat layer from soaking into the paper, and it can also play the role of a filler that fills in the unevenness of the paper, making it possible to form the anchor coat layer uniformly without defects. can.
- various copolymers such as styrene/butadiene, styrene/acrylic, and ethylene/vinyl acetate, polyvinyl alcohol resins, cellulose resins, and paraffin (WAX) are used as binder resins.
- Fillers such as clay, kaolin, calcium carbonate, talc and mica may be included.
- the thickness of the coat layer is not particularly limited, but may be, for example, 1 to 10 ⁇ m or 3 to 8 ⁇ m.
- the weight of the paper base material 1 is 50% by mass or more based on the entire packaging material, so that the packaging material 10 has excellent tearability regardless of the tearing direction even if it does not have a notch.
- the amount of plastic material used can be sufficiently reduced, the entire packaging material can be said to be made of paper, and the recyclability is excellent.
- the weight of the paper substrate is preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more.
- the fibers contained in the paper base material 1 are preferably non-oriented because they have excellent tearability regardless of the direction of tearing even if they do not have notches.
- the anchor coat layer 2 is provided on the surface of the paper base material 1 to improve the adhesion between the paper base material 1 and the vapor deposition layer 3 described later and to improve the gas barrier properties of the packaging material. be.
- the material of the anchor coat layer 2 is not particularly limited, but examples thereof include polyurethane-based resins, polyvinyl alcohol-based resins, and third polyolefin-based resins having polar groups.
- the anchor coat layer 2 contains a polyurethane-based resin, it has good wettability, so it is excellent in coating stability, and the adhesion between the paper substrate 1 and the vapor deposition layer 3 is improved. In addition, since the surface smoothness of the anchor coat layer 2 is improved, the vapor deposition layer 3 is easily formed densely, and the gas barrier property is further improved. A further improvement in gas barrier properties can be expected by using a polyurethane-based resin having gas barrier properties.
- the polyurethane resin preferably contains at least one of structural units derived from meta-xylylene diisocyanate and structural units derived from hydrogenated meta-xylylene diisocyanate.
- the polyurethane-based resin contains such structural units, it exhibits high cohesive strength due to the hydrogen bonding and the stacking effect between the xylylene groups, which tends to further improve the gas barrier properties.
- the coating liquid used for forming the anchor coat layer containing the polyurethane resin is preferably a coating liquid dispersed in water such as a dispersion or an emulsion. Examples of such a coating liquid include Takelac WPB manufactured by Mitsui Chemicals.
- the third polyolefin-based resin in the anchor coat layer 2, it is possible to form a dense film due to the crystallinity of polyolefin, and the water vapor barrier property is exhibited. Due to the crystallinity of the polyolefin, water vapor barrier properties are exhibited, and the presence of polar groups allows adhesion with the deposition layer 3 to be exhibited.
- the third polyolefin resin may have at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic acid anhydride group and a carboxylic acid ester.
- the third polyolefin-based resin ethylene or propylene is copolymerized with unsaturated carboxylic acid (unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid, or maleic anhydride) or unsaturated carboxylic acid ester, and A salt obtained by neutralizing a carboxylic acid with a basic compound may be used, or a copolymer obtained by copolymerizing vinyl acetate, an epoxy-based compound, a chlorine-based compound, a urethane-based compound, a polyamide-based compound, or the like may be used. .
- the third polyolefin resin examples include copolymers of acrylic acid ester and maleic anhydride, ethylene-vinyl acetate copolymers, and ethylene glycidyl methacrylate copolymers.
- Polyvinyl alcohol resins include, for example, completely saponified polyvinyl alcohol resins, partially saponified polyvinyl alcohol resins, modified polyvinyl alcohol resins, ethylene-vinyl alcohol copolymer resins, and the like.
- the degree of polymerization of the polyvinyl alcohol resin is preferably 300 or more and 1700 or less. If the degree of polymerization is 300 or more, the gas barrier property and bending resistance of the packaging material will be good, and if the degree of polymerization is 1700 or less, the coating liquid of the polyvinyl alcohol resin described later will have a low viscosity and good applicability. become.
- the anchor coat layer 2 contains a polyvinyl alcohol-based resin, it is excellent in flexibility and can suppress cracking of the vapor deposition layer 3 after bending (after bending), thereby suppressing deterioration of the gas barrier property. and the anchor coat layer 2 can be improved.
- the anchor coat layer 2 may contain other components in addition to the polyurethane-based resin, the third polyolefin-based resin, and the polyvinyl alcohol-based resin.
- Other components include, for example, polyolefin resins other than the third polyolefin resin, silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyimides, melamine and phenol.
- the content of the polyurethane resin in the anchor coat layer 2 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass.
- the content of the third polyolefin resin in the anchor coat layer 2 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass. you can
- the content of the polyvinyl alcohol resin in the anchor coat layer 2 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass. .
- the thickness of the anchor coat layer 2 may be, for example, 1 ⁇ m or more, 2 ⁇ m or more, 20 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less. If the thickness of the anchor coat layer 2 is 1 ⁇ m or more, the unevenness of the paper substrate 1 can be efficiently filled, and the vapor deposition layer 3 can be uniformly laminated. Moreover, if the thickness of the anchor coat layer 2 is 20 ⁇ m or less, the deposition layer 3 can be uniformly laminated while suppressing the cost.
- the particle size of the third polyolefin-based resin in the coating liquid is preferably small.
- the particle size is not particularly limited, it is preferably 0.1 to 0.7 ⁇ m.
- the anchor coat layer 2 is excellent in smoothness, so that the deposited layer 3 tends to be uniform with little variation in thickness. As a result, the gas barrier property of the packaging material 10 tends to be further improved.
- Examples of the solvent contained in the coating liquid of the anchor coat layer 2 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethylsulfoxide, dimethylformamide, and dimethylacetamide. , toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate and butyl acetate. These solvents may be used singly or in combination of two or more.
- methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone and water are preferred from the viewpoint of properties. Also, from an environmental point of view, methyl alcohol, ethyl alcohol, isopropyl alcohol and water are preferred.
- the deposited layer 3 is a layer deposited with an inorganic oxide, a metal, or a metal oxide.
- the deposited layer may be obtained by depositing silica, may be obtained by depositing aluminum, or may contain aluminum oxide (AlO x ) or the like. .
- the thickness of the vapor deposition layer 3 may be appropriately set depending on the intended use, but may preferably be 10 nm or more, 30 nm or more, 50 nm or more, and may be 300 nm or less, 100 nm or less, and 80 nm or less.
- the thickness of the deposition layer 3 is 10 nm or more, the continuity of the deposition layer 3 can be easily made sufficient, and when the thickness is 300 nm or less, the occurrence of curling and cracking can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be obtained. easy to achieve.
- Film formation means include known methods such as a vacuum deposition method, a sputtering method, and a chemical vapor deposition method (CVD method), but the vacuum deposition method is preferred because of its high film formation speed and high productivity.
- vacuum evaporation methods electron beam heating is particularly effective because the film formation rate can be easily controlled by adjusting the irradiation area and electron beam current, and the temperature of the vapor deposition material can be raised and lowered in a short period of time. be.
- the sealant layer 4 is provided on the surface of the vapor deposition layer 3 so as to be in contact with the vapor deposition layer 3 .
- the thickness of the sealant layer 4 is 2-40 ⁇ m.
- the sealant layer 4 contains a first polyolefin resin.
- the first polyolefin resin has a polar group.
- the sealant layer 4 By including the first polyolefin-based resin in the sealant layer 4, it is possible to form a dense film due to the crystallinity of polyolefin, and the water vapor barrier property is exhibited. Furthermore, since the polyolefin-based resin has a polar group, adhesion with the deposition layer 3 is exhibited, so there is no need to provide an adhesive layer separately. Therefore, the ratio of paper in the packaging material is increased, and tearability is further improved.
- Polar groups include, for example, carboxyl groups, salts of carboxyl groups, carboxylic acid anhydride groups, and carboxylic acid esters.
- the first polyolefin-based resin ethylene or propylene is copolymerized with unsaturated carboxylic acid (unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid, or maleic anhydride) or unsaturated carboxylic acid ester, and A salt obtained by neutralizing a carboxylic acid with a basic compound may be used, or a copolymer obtained by copolymerizing vinyl acetate, an epoxy-based compound, a chlorine-based compound, a urethane-based compound, a polyamide-based compound, or the like may be used. .
- unsaturated carboxylic acid unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid, or maleic anhydride
- unsaturated carboxylic acid ester unsaturated carboxylic acid ester
- a salt obtained by neutralizing a carboxylic acid with a basic compound may be used, or a copolymer obtained by copolymerizing vinyl acetate, an epoxy
- first polyolefin resin examples include copolymers of acrylic acid ester and maleic anhydride, ethylene-vinyl acetate copolymers, and ethylene glycidyl methacrylate copolymers.
- the sealant layer 4 may contain other components in addition to the first polyolefin resin.
- Other components include, for example, silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyolefin emulsions, polyimides, melamine and phenols.
- the content of the first polyolefin resin in the sealant layer 4 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass. good.
- the thickness of the sealant layer 4 is 2-40 ⁇ m. When the thickness of the sealant layer 4 is 2 ⁇ m or more, sufficient sealing strength for protecting the contents can be obtained. Since the thickness of the sealant layer 4 is 40 ⁇ m or less, the packaging material 10 has excellent tearability regardless of the tearing direction even if it does not have a notch, and the amount of plastic material used is sufficiently reduced. can be reduced. From the same viewpoint, the thickness of the sealant layer 4 may be 10 ⁇ m or less, or may be 5 ⁇ m or less. The packaging material 10 having the sealant layer 4 with such a thickness can be suitably used as a packaging material for packaging light contents.
- the sealant layer 4 may be a single layer or a multilayer consisting of two or more layers.
- the sealant layer 4 As a method for providing the sealant layer 4, it can be obtained by applying a coating liquid containing the first polyolefin resin and a solvent onto the deposition layer 3 and drying it.
- Solvents contained in the coating liquid of the sealant layer 4 include, for example, water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethylsulfoxide, dimethylformamide, dimethylacetamide, Toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate and butyl acetate. These solvents may be used singly or in combination of two or more.
- methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone and water are preferred from the viewpoint of properties. Also, from an environmental point of view, methyl alcohol, ethyl alcohol, isopropyl alcohol and water are preferred.
- the melting point of the first polyolefin resin in the coating liquid is preferably 70-160°C, more preferably 80-120°C. If the melting point is low, there is an advantage that the rising temperature at the time of heat sealing can be lowered. If the melting point of the first polyolefin resin is high, there is a high risk of blocking in a high temperature environment. From the viewpoint of preventing blocking, the particle size should be large so that the contact area is small. Although not particularly limited, the particle size may specifically be 1 nm or more, 0.1 ⁇ m or more, or 1 ⁇ m or less, 0.7 ⁇ m or less, or 0.5 ⁇ m or less.
- the tensile breaking strength of the packaging material 10 is 40-70N/15mm.
- the packaging bag obtained from the packaging material 10 has sufficient strength, and the occurrence of defects such as tearing during transportation can be suppressed.
- a tensile strength at break of 70 N/15 mm or less the packaging material 10 has excellent tearability even if it does not have a notch.
- Tensile breaking strength is obtained by pulling a test piece (length in the longitudinal direction: 100 mm, length in the lateral direction: 15 mm) cut out from the packaging material 10 in the longitudinal direction with a tensile tester (test length: 50 mm, tensile speed: 200 mm /min).
- the tensile breaking strength of the packaging material 10 when the fibers contained in the paper base material 1 are non-oriented, the tensile breaking strength in an arbitrary direction in the packaging material 10 and in a direction perpendicular to the arbitrary direction is the above It can be a numerical range.
- the tensile breaking strength of the packaging material 10 is determined by the orientation direction of the fibers of the paper base material 1 in the packaging material 10 and the direction perpendicular to the orientation direction. The tensile strength at break may be within the above numerical range.
- FIG. 2 is a schematic cross-sectional view showing the packaging material according to the second embodiment.
- the packaging material 15 according to one embodiment includes a paper substrate 1, an anchor coat layer 2, a vapor deposition layer 3, an overcoat layer 11, an adhesive layer 12, and a sealant layer 4 in this order. have a structure.
- the sealant layer 4 is provided on the surface of the adhesive layer 12 so as to be in contact with the adhesive layer 12 .
- the sealant layer 4 contains a first polyolefin resin.
- the first polyolefin-based resin include low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), high-density polyethylene resin (HDPE), linear low-density polyethylene resin (LLDPE), and ethylene-vinyl acetate.
- Copolymers (EVA), propylene homopolymers, ethylene-propylene block copolymers and ethylene-propylene random copolymers can be mentioned. These can be used individually by 1 type or in combination of 2 or more types.
- the thickness of the sealant layer 4 is 2-40 ⁇ m. Since the strength of the packaging material 15 tends to improve, the thickness of the sealant layer 4 may be 10 ⁇ m or more, which further improves tearability and further reduces the amount of plastic material used. to 20 ⁇ m or less.
- the packaging material 15 having the sealant layer 4 with such a thickness can be suitably used as a packaging material for packaging heavy contents.
- Examples of methods for forming the sealant layer 4 include an extrusion lamination method and a dry lamination method, and from the viewpoint of protecting the vapor deposition layer 3, the dry lamination method is preferable.
- the overcoat layer 11 is provided on the surface of the vapor deposition layer 3 so as to be in contact with the vapor deposition layer 3, and contains a second polyolefin resin having a polar group.
- the packaging material 15 further improves gas barrier properties.
- the adhesion between the overcoat layer 11 and the vapor deposition layer 3 and the adhesion between the overcoat layer 11 and the adhesive layer 12 are superior to the adhesion between the vapor deposition layer 3 and the adhesive layer 12,
- the packaging material 15 including the overcoat layer 11 has excellent adhesion.
- the packaging material 15 may not have the overcoat layer 11 .
- the second polyolefin resin may have at least one selected from a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group and a carboxylic acid ester.
- the second polyolefin resin ethylene or propylene is copolymerized with unsaturated carboxylic acid (unsaturated compound having a carboxyl group such as acrylic acid or methacrylic acid) or unsaturated carboxylic acid ester, and carboxylic acid is used as a base.
- unsaturated carboxylic acid unsaturated compound having a carboxyl group such as acrylic acid or methacrylic acid
- carboxylic acid ester unsaturated carboxylic acid ester
- carboxylic acid is used as a base.
- a salt neutralized with a chemical compound may also be used, and a copolymer obtained by copolymerizing with vinyl acetate, an epoxy compound, a chlorine compound, a urethane compound, a polyamide compound, or the like may also be used.
- the second polyolefin resin examples include copolymers of acrylic acid ester and maleic anhydride, ethylene-vinyl acetate copolymers, and ethylene glycidyl methacrylate copolymers.
- Such an overcoat layer 11 has excellent flexibility, can suppress cracking of the deposited layer 3 after bending (after bending), and has excellent adhesion to the deposited layer 3 . Furthermore, by including the second polyolefin-based resin, it is possible to form a dense film due to the crystallinity of the polyolefin, thereby exhibiting water vapor barrier properties. In addition, by having a polar group, adhesion with the deposition layer 3 is developed.
- the overcoat layer 11 may contain other components in addition to the second polyolefin resin.
- Other components include, for example, silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyolefin emulsions, polyimides, melamine and phenols.
- the content of the second polyolefin resin in the overcoat layer 11 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass. you can
- the thickness of the overcoat layer 11 may be, for example, 0.05 ⁇ m or more, 0.5 ⁇ m or more, 1 ⁇ m or more, 20 ⁇ m or less, or 10 ⁇ m or less, It may be 5 ⁇ m or less. Moreover, if the thickness of the overcoat layer 11 is 20 ⁇ m or less, it is possible to sufficiently exhibit adhesion to the deposited layer and gas barrier properties while suppressing costs.
- the overcoat layer 11 As a method for providing the overcoat layer 11, it can be obtained by applying a coating liquid containing the second polyolefin resin and a solvent on the deposition layer 3 and drying it.
- Examples of the solvent contained in the coating liquid of the overcoat layer 11 include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethylsulfoxide, dimethylformamide, and dimethylacetamide. , toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate and butyl acetate. These solvents may be used singly or in combination of two or more.
- methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone and water are preferred from the viewpoint of properties. Also, from an environmental point of view, methyl alcohol, ethyl alcohol, isopropyl alcohol and water are preferred.
- the melting point of the second polyolefin resin in the coating liquid is preferably 70-160°C, more preferably 80-120°C. If the melting point of the second polyolefin-based resin is high, the possibility of blocking in a high-temperature environment increases. From the viewpoint of preventing blocking, the particle size should be large so that the contact area is small. Although not particularly limited, the particle size may specifically be 1 nm or more, 0.1 ⁇ m or more, or 1 ⁇ m or less, 0.7 ⁇ m or less, or 0.5 ⁇ m or less.
- the adhesive layer 12 is provided on the surface of the overcoat layer 11 .
- various materials can be used as long as they adhere the overcoat layer 11 and the sealant layer 4 together.
- a urethane-based adhesive is a resin composition containing a polyol having two or more hydroxyl groups in one molecule and an isocyanate compound having two or more isocyanate groups in one molecule.
- a urethane bond is generated by curing the urethane adhesive.
- the urethane-based adhesive is preferably of a two-liquid curing type.
- the urethane-based adhesive may have gas barrier properties.
- the thickness of the adhesive layer 12 is preferably 0.1 ⁇ m or more from the viewpoint of improving the adhesiveness of the adhesive layer 12, and is 5 ⁇ m or less to further reduce the amount of plastic material used. is preferred.
- FIG. 3 is a perspective view showing a gusset bag 20 made of the packaging material 10.
- a packaging bag is manufactured by sealing the upper opening of the gusset bag 20 .
- the gusset bag 20 has portions (bent portions B1 and B2) where the packaging material 10 is folded.
- the folding portion B1 is a portion where the packaging material 10 is valley-folded when viewed from the innermost layer side
- the folding portion B2 is a portion where the packaging material 10 is mountain-folded when viewed from the innermost layer side.
- the packaging bag may be made into a bag shape by folding one sheet of packaging material in two so that the sealant layers 4 face each other, then appropriately folding it into a desired shape and heat-sealing it. After stacking two packaging materials so that the sealant layers 4 face each other, the packaging material may be heat-sealed to form a bag shape.
- the heat seal strength is not particularly limited.
- the heat seal strength can be appropriately changed by changing the thickness of the sealant layer 4 .
- the heat seal strength may be 2N or more and 10N or less.
- the heat seal strength is preferably 10 N or more.
- the packaging bag can contain contents such as food and medicine. In particular, it is suitable for storing sweets and the like as food.
- the packaging bag according to this embodiment can maintain a high gas barrier property even if it has a shape having a folded portion.
- a gusset bag is given as an example of a packaging bag, but the packaging material according to the above embodiment may be used to produce, for example, a pillow bag, a three-sided seal bag, or a standing pouch.
- the packaging bag may consist of the packaging material 15 .
- Example 1 A coating liquid (product Name: Chemipearl S500, ionomer type, particle size: ⁇ 0.5 ⁇ m, solvent: water and IPA, manufactured by Mitsui Chemicals, Inc.) was coated with a bar coater, dried in an oven, and an anchor coat layer (thickness: 3 ⁇ m). formed. Subsequently, AL vapor deposition was performed on the anchor coat layer to form an AL vapor deposition layer (thickness: 50 nm).
- a coating liquid product Name: Chemipearl S500, ionomer type, particle size: ⁇ 0.5 ⁇ m, solvent: water and IPA, manufactured by Mitsui Chemicals, Inc.
- an unstretched polypropylene resin (CPP) film (thickness: 20 ⁇ m) as a sealant layer and an adhesive (trade name: Takelac A525/Takenate A52, urethane-based two-liquid type, manufactured by Mitsui Chemicals, Inc.) are applied.
- a packaging material was obtained by dry lamination using The thickness of the adhesive layer was 2 ⁇ m.
- the weight of the paper in the packaging material is shown in Table 1.
- Example 2 An anchor coat layer was formed on the surface of the paper in the same manner as in Example 1, and an AL deposition layer was formed on the anchor coat layer.
- a coating liquid containing a polyolefin resin having a carboxyl group and a salt of a carboxyl group (trade name: Chemipearl S500, ionomer type, particle size: ⁇ 0.5 ⁇ m, solvent: water and IPA, Mitsui Chemicals, Inc. company) was coated with a bar coater and dried in an oven to form an overcoat layer (thickness: 3 ⁇ m).
- an unstretched polypropylene resin (CPP) film (thickness: 20 ⁇ m) as a sealant layer is applied with an adhesive (trade name: Takelac A525/Takenate A52, urethane-based two-liquid type, manufactured by Mitsui Chemicals, Inc.). was used to dry laminate to obtain a packaging material.
- the thickness of the adhesive layer was 2 ⁇ m.
- the weight of the paper in the packaging material is shown in Table 1.
- Example 3 An anchor coat layer was formed on the surface of the paper in the same manner as in Example 1, and an AL deposition layer was formed on the anchor coat layer.
- a coating liquid containing a polyolefin resin having a carboxyl group and a salt of a carboxyl group (trade name: Chemipearl S500, ionomer type, particle size: ⁇ 0.5 ⁇ m, solvent: water and IPA, Mitsui Chemicals, Inc. company) was coated with a bar coater and dried in an oven to form a sealant layer (thickness: 3 ⁇ m) to obtain a packaging material.
- the weight of the paper in the packaging material is shown in Table 1.
- Example 4 Except that a polyvinyl alcohol resin (degree of saponification: 98%, degree of polymerization: 500) was used to form the anchor coat layer instead of the coating liquid containing the polyolefin resin having a carboxyl group and a salt of the carboxyl group.
- a packaging material was obtained in the same manner as in Example 1. The weight of the paper in the packaging material is shown in Table 1.
- Example 5 Packaging material in the same manner as in Example 1, except that the sealant layer was formed using a linear low-density polyethylene resin (LLDPE) film (thickness: 20 ⁇ m) instead of the unstretched polypropylene resin (CPP) film. got The weight of the paper in the packaging material is shown in Table 2.
- LLDPE linear low-density polyethylene resin
- CPP unstretched polypropylene resin
- Example 6 Packaging material in the same manner as in Example 1, except that the sealant layer was formed using a linear low-density polyethylene resin (LLDPE) film (thickness: 40 ⁇ m) instead of the unstretched polypropylene resin (CPP) film. got The weight of the paper in the packaging material is shown in Table 2.
- LLDPE linear low-density polyethylene resin
- CPP unstretched polypropylene resin
- Example 1 A packaging material was obtained in the same manner as in Example 1, except that the thickness of the unstretched polypropylene resin (CPP) was 60 ⁇ m. The weight of the paper in the packaging material is shown in Table 2.
- CPP unstretched polypropylene resin
- Example 2 A packaging material was obtained in the same manner as in Example 1, except that a polyethylene terephthalate (PET) film (thickness: 30 ⁇ m) was used to form the sealant layer instead of the unstretched polypropylene resin (CPP) film.
- the weight of the paper in the packaging material is shown in Table 2.
- Example 7 A packaging material was obtained in the same manner as in Example 1, except that the deposited layer was silica. The weight of the paper in the packaging material is shown in Table 3.
- Example 8 A packaging material was obtained in the same manner as in Example 1, except that the deposited layer was made of alumina. The weight of the paper in the packaging material is shown in Table 3.
- Example 9 A packaging material was obtained in the same manner as in Example 1, except that paper (clay coated paper, basis weight: 50 g/m 2 , paper thickness: 45 ⁇ m, clay coat thickness: 5 ⁇ m) was used as the paper.
- the weight of the paper in the packaging material is shown in Table 3.
- Example 10 A packaging material was obtained in the same manner as in Example 1, except that the anchor coat layer was formed using a polyurethane resin instead of the coating liquid containing the polyolefin resin having a carboxyl group and a salt of the carboxyl group.
- the weight of the paper in the packaging material is shown in Table 3.
- Example 11 A packaging material was obtained in the same manner as in Example 3, except that the anchor coat layer was formed using a polyurethane resin instead of the coating liquid containing the polyolefin resin having a carboxyl group and a salt of the carboxyl group.
- the weight of the paper in the packaging material is shown in Table 3.
- Example 3 A packaging material was obtained in the same manner as in Example 10, except that the thickness of the unstretched polypropylene resin (CPP) was 60 ⁇ m. The weight of the paper in the packaging material is shown in Table 3.
- a three-sided pouch (size: 10 cm square, seal width: 5 mm) was prepared by laminating the packaging materials according to Examples and Comparative Examples so that the sealant layers face each other. 5 evaluators were randomly selected from 10 men and 10 men each, and the selected evaluators tore the three-sided pouch and evaluated the ease of tearing according to the following criteria.
- the directions in which the three-sided pouch was torn were the direction along the machine direction (MD) in the papermaking process and the direction perpendicular to the machine direction (CD) in the papermaking process.
- the worst evaluation result among the evaluation results of the selected evaluators was taken as the evaluation result of the packaging material. The results are shown in Tables 1-3. (Evaluation criteria) A: Easily torn and no elongation of the sealant layer is confirmed B: Tearable but elongation of the sealant layer is confirmed C: Not torn
- Test pieces were cut out from the packaging materials according to Examples and Comparative Examples.
- the size of the test piece was 100 mm in the direction along the machine direction (MD) in the paper making process, and 15 mm in the direction (CD) perpendicular to the machine direction in the paper making process.
- the test piece was pulled in the longitudinal direction (MD) with a tensile tester to measure the tensile strength at break.
- the test length was 50 mm and the tensile speed was 200 mm/min. Measurements were made on 5 specimens. The average value of the measured values obtained from the five test pieces was taken as the MD tensile breaking strength of the packaging material.
- test piece with a length of 100 mm in the direction perpendicular to the machine direction (CD) in the papermaking process and a length of 15 mm in the direction along the machine direction (MD) in the papermaking process was also tested for MD tension.
- the tensile strength at break was measured in the same manner as the strength at break, and was taken as the tensile strength at break of CD. The results are shown in Tables 1-3.
- the gist of the present disclosure lies in the following [1] to [9].
- the sealant layer contains a first polyolefin resin, An easy-open packaging material having a tensile breaking strength of 40 to 70 N/15 mm.
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Abstract
Description
{第一実施形態}
以下、第一実施形態に係る易開封性包装材について説明する。図1は、第一実施形態に係る包装材を示す模式断面図である。一実施形態に係る包装材10は、紙基材1と、アンカーコート層2と、蒸着層3と、シーラント層4と、をこの順序で備える積層構造を有する。
紙基材1としては、特に限定されるものではなく、包装材10が適用される包装袋の用途に応じて適宜選択すればよい。植物由来のパルプを主成分としている紙であれば特に制限はない。紙基材1の具体例として、上質紙、特殊上質紙、コート紙、アート紙、キャストコート紙、模造紙及びクラフト紙、グラシン紙が挙げられる。紙基材1の坪量は、引き裂き性に一層優れることから、例えば、20g/m2以上、30g/m2以上、35g/m2以上、又は40g/m2以上であってよく、500g/m2以下、300g/m2以下、又は100g/m2以下であってよい。
アンカーコート層2は、紙基材1の表面上に設けられ、紙基材1と後述する蒸着層3との間の密着性向上や、包装材のガスバリア性の向上のために設けられるものである。アンカーコート層2の材質は、特に制限されないが、例えば、ポリウレタン系樹脂、ポリビニルアルコール系樹脂及び極性基を有する第3のポリオレフィン系樹脂が挙げられる。
蒸着層3は、無機酸化物、金属又は金属酸化物を蒸着した層である。蒸着層としては、シリカを蒸着して得られたものであってもよく、アルミニウムを蒸着して得られたものであってもよく、酸化アルミニウム(AlOx)等を含むものであってもよい。
シーラント層4は、蒸着層3の表面上に、蒸着層3に接するように設けられる。シーラント層4の厚さは、2~40μmである。シーラント層4は、第1のポリオレフィン系樹脂を含む。第1のポリオレフィン系樹脂は、極性基を有する。
以下、第二実施形態に係る易開封性包装材について説明する。以下で説明がない点については、不整合が生じない限り、第一実施形態に係る易開封性包装材と同様である。図2は、第二実施形態に係る包装材を示す模式断面図である。一実施形態に係る包装材15は、紙基材1と、アンカーコート層2と、蒸着層3と、オーバーコート層11と、接着剤層12と、シーラント層4と、をこの順序で備える積層構造を有する。
シーラント層4は、接着剤層12の表面上に、接着剤層12に接するように設けられる。シーラント層4は、第1のポリオレフィン系樹脂を含む。第1のポリオレフィン系樹脂としては、例えば、低密度ポリエチレン樹脂(LDPE)、中密度ポリエチレン樹脂(MDPE)、高密度ポリエチレン樹脂(HDPE)、直鎖状低密度ポリエチレン樹脂(LLDPE)、エチレン-酢酸ビニル共重合体(EVA)、プロピレン単独重合体、エチレン-プロピレンブロック共重合体及びエチレン-プロピレンランダム共重合体が挙げられる。これらは1種を単独で又は2種以上を併用して用いることができる。
オーバーコート層11は、蒸着層3の表面上に、蒸着層3に接するように設けられるもので、極性基を有する第2のポリオレフィン系樹脂を含む。包装材15は、オーバーコート層11を備えることで、ガスバリア性が一層向上する。また、オーバーコート層11と蒸着層3との密着性、及びオーバーコート層11と接着剤層12との密着性は、蒸着層3と接着剤層12との密着性よりも優れているため、オーバーコート層11を備える包装材15は、密着性に優れる。包装材15は、オーバーコート層11を備えていなくてもよい。
接着剤層12は、オーバーコート層11の表面上に設けられる。接着剤層12としては、オーバーコート層11とシーラント層4とを密着させるものであれば、様々なものを用いることができるが、例えば、ウレタン系接着剤の硬化物が挙げられる。
図3は、包装材10からなるガゼット袋20を示す斜視図である。ガゼット袋20の上部の開口部をシールすることで包装袋が製造される。ガゼット袋20は包装材10が折り曲げられている箇所(折り曲げ部B1,B2)を有する。折り曲げ部B1は、最内層側からみて包装材10が谷折りされている箇所であり、他方、折り曲げ部B2は、最内層側からみて包装材10が山折りされている箇所である。
(実施例1)
紙(クレーコート紙、坪量:60g/m2、紙厚さ:55μm、クレーコート厚さ:5μm)の表面上に、カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液(商品名:ケミパールS500、アイオノマー系、粒径:<0.5μm、溶媒:水及びIPA、三井化学株式会社製)をバーコーターで塗工し、オーブンで乾燥させ、アンカーコート層(厚さ:3μm)を形成した。続いて、アンカーコート層上にAL蒸着を施してAL蒸着層(厚さ:50nm)を形成した。蒸着層上に、シーラント層としての無延伸ポリプロピレン樹脂(CPP)フィルム(厚さ:20μm)、を接着剤(商品名:タケラックA525/タケネートA52、ウレタン系2液タイプ、三井化学株式会社製)を用いてドライラミネートして包装材を得た。接着剤層の厚さは2μmであった。包装材における紙の重量は表1に示した。
実施例1と同様にして紙の表面上にアンカーコート層を、アンカーコート層上にAL蒸着層を形成した。蒸着層の表面上に、カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液(商品名:ケミパールS500、アイオノマー系、粒径:<0.5μm、溶媒:水及びIPA、三井化学株式会社製)をバーコーターで塗工し、オーブンで乾燥させ、オーバーコート層(厚さ:3μm)を形成した。オーバーコート層上に、シーラント層としての無延伸ポリプロピレン樹脂(CPP)フィルム(厚さ:20μm)、を接着剤(商品名:タケラックA525/タケネートA52、ウレタン系2液タイプ、三井化学株式会社製)を用いてドライラミネートして包装材を得た。接着剤層の厚さは2μmであった。包装材における紙の重量は表1に示した。
実施例1と同様にして紙の表面上にアンカーコート層を、アンカーコート層上にAL蒸着層を形成した。蒸着層の表面上に、カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液(商品名:ケミパールS500、アイオノマー系、粒径:<0.5μm、溶媒:水及びIPA、三井化学株式会社製)をバーコーターで塗工し、オーブンで乾燥させ、シーラント層(厚さ:3μm)を形成して包装材を得た。包装材における紙の重量は表1に示した。
カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液に代えて、ポリビニルアルコール系樹脂(けん化度:98%、重合度:500)を用いてアンカーコート層を形成したこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表1に示した。
無延伸ポリプロピレン樹脂(CPP)フィルムに代えて、直鎖状低密度ポリエチレン樹脂(LLDPE)フィルム(厚さ:20μm)を用いてシーラント層を形成したこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表2に示した。
無延伸ポリプロピレン樹脂(CPP)フィルムに代えて、直鎖状低密度ポリエチレン樹脂(LLDPE)フィルム(厚さ:40μm)を用いてシーラント層を形成したこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表2に示した。
無延伸ポリプロピレン樹脂(CPP)の厚さを60μmとしたこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表2に示した。
無延伸ポリプロピレン樹脂(CPP)フィルムに代えて、ポリエチレンテレフタレート(PET)フィルム(厚さ:30μm)を用いてシーラント層を形成したこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表2に示した。
蒸着層をシリカとしたこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表3に示した。
蒸着層をアルミナとしたこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表3に示した。
紙として紙(クレーコート紙、坪量:50g/m2、紙厚さ:45μm、クレーコート厚さ:5μm)を用いたこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表3に示した。
カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液に代えて、ポリウレタン系樹脂を用いてアンカーコート層を形成したこと以外は、実施例1と同様にして包装材を得た。包装材における紙の重量は表3に示した。
カルボキシル基及びカルボキシル基の塩を有するポリオレフィン系樹脂を含む塗液に代えて、ポリウレタン系樹脂を用いてアンカーコート層を形成したこと以外は、実施例3と同様にして包装材を得た。包装材における紙の重量は表3に示した。
無延伸ポリプロピレン樹脂(CPP)の厚さを60μmとしたこと以外は、実施例10と同様にして包装材を得た。包装材における紙の重量は表3に示した。
実施例及び比較例に係る包装材をシーラント層が向かい合うように貼り合わせ三方パウチ(サイズ:10センチ角、シール幅:5mm)を作製した。男女それぞれ10人から無作為に5人の評価者を選び、選ばれた評価者が三方パウチを引き裂き、引き裂きやすさを下記の基準に沿って評価した。三方パウチを引き裂く方向は、紙の抄紙工程における流れ方向に沿った方向(MD)と、紙の抄紙工程における流れ方向に垂直な方向(CD)とした。選ばれた評価者の評価結果のうち最も悪い評価結果をその包装材の評価結果とした。結果を表1~3に示した。
(評価基準)
A:容易に引き裂けシーラント層の伸びが確認されない
B:引き裂けるがシーラント層の伸びが確認される
C:引き裂けない
実施例及び比較例に係る包装材から試験片を切り出した。試験片のサイズは、紙の抄紙工程における流れ方向に沿った方向(MD)の長さを100mm、紙の抄紙工程における流れ方向に垂直な方向(CD)の長さを15mmとした。引張試験機にて試験片を長手方向(MD)に引っ張り、引張破断強度を測定した。試験長は50mm、引張速度は200mm/分とした。測定は5つの試験片に対して行った。5つの試験片から得られた測定値の平均値を包装材のMDの引張破断強度とした。また、紙の抄紙工程における流れ方向に垂直な方向(CD)の長さを100mm、紙の抄紙工程における流れ方向に沿った方向(MD)の長さを15mmとした試験片についてもMDの引張破断強度と同様に引張破断強度を測定し、CDの引張破断強度とした。結果を表1~3に示した。
実施例及び比較例に係る包装材の水蒸気透過度をMOCON法で測定した。測定条件は、温度40℃、相対湿度90%とした。測定装置は、PERMATRAN(商品名、MOCON社製)を用いた。600gのローラーを300mm/分の速さで転がしながら、紙基材が内側となるように包装材を180度折り曲げ、開いた後の包装材の水蒸気透過度も同様に測定した。表1~3に結果を単位[g/m2・day]で表記した。
[1]紙基材と、
アンカーコート層と、
金属又は金属酸化物の蒸着層と、
シーラント層と、
をこの順序で備える積層構造を有する包装材であって、
紙基材の重量が、包装材全体を基準として、50質量%以上であり、
シーラント層の厚さが、2~40μmであり、
シーラント層が、第1のポリオレフィン系樹脂を含み、
引張破断強度が、40~70N/15mmである、易開封性包装材。
[2]第1のポリオレフィン系樹脂が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する、[1]に記載の易開封性包装材。
[3]シーラント層の厚さが、2~20μmである、[1]又は[2]に記載の易開封性包装材。
[4]蒸着層と、シーラント層との間に接着剤層を更に備える、[1]~[3]のいずれかに記載の易開封性包装材。
[5]蒸着層と、接着剤層との間にオーバーコート層を更に備え、
オーバーコート層が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する第2のポリオレフィン系樹脂を含む、[4]に記載の易開封性包装材。
[6]アンカーコート層が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する第3のポリオレフィン系樹脂を含む、[1]~[5]のいずれかに記載の易開封性包装材。
[7]アンカーコート層が、ポリビニルアルコール系樹脂を含む、[1]~[5]のいずれかに記載の易開封性包装材。
[8][1]~[7]のいずれかに記載の易開封性包装材を含む、包装袋。
[9]折り曲げ部を有する、[8]に記載の包装袋。
Claims (9)
- 紙基材と、
アンカーコート層と、
金属又は金属酸化物の蒸着層と、
シーラント層と、
をこの順序で備える積層構造を有する包装材であって、
前記紙基材の重量が、包装材全体を基準として、50質量%以上であり、
前記シーラント層の厚さが、2~40μmであり、
前記シーラント層が、第1のポリオレフィン系樹脂を含み、
引張破断強度が、40~70N/15mmである、易開封性包装材。 - 前記第1のポリオレフィン系樹脂が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する、請求項1に記載の易開封性包装材。
- 前記シーラント層の厚さが、2~20μmである、請求項1に記載の易開封性包装材。
- 前記蒸着層と、前記シーラント層との間に接着剤層を更に備える、請求項1に記載の易開封性包装材。
- 前記蒸着層と、前記接着剤層との間にオーバーコート層を更に備え、
前記オーバーコート層が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する第2のポリオレフィン系樹脂を含む、請求項4に記載の易開封性包装材。 - 前記アンカーコート層が、カルボキシル基及びカルボキシル基の塩からなる群より選択される少なくとも1種を有する第3のポリオレフィン系樹脂を含む、請求項1に記載の易開封性包装材。
- 前記アンカーコート層が、ポリビニルアルコール系樹脂を含む、請求項1に記載の易開封性包装材。
- 請求項1~7のいずれか一項に記載の易開封性包装材を含む、包装袋。
- 折り曲げ部を有する、請求項8に記載の包装袋。
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