NZ733925B - Reclosable packaging - Google Patents
Reclosable packagingInfo
- Publication number
- NZ733925B NZ733925B NZ733925A NZ73392516A NZ733925B NZ 733925 B NZ733925 B NZ 733925B NZ 733925 A NZ733925 A NZ 733925A NZ 73392516 A NZ73392516 A NZ 73392516A NZ 733925 B NZ733925 B NZ 733925B
- Authority
- NZ
- New Zealand
- Prior art keywords
- sensitive adhesive
- adhesive
- pattern
- permanent adhesive
- pressure sensitive
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title claims description 37
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 162
- 230000001070 adhesive Effects 0.000 claims abstract description 151
- 239000000853 adhesive Substances 0.000 claims abstract description 149
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 17
- 229920000642 polymer Polymers 0.000 claims description 17
- 229920001577 copolymer Polymers 0.000 claims description 16
- 239000004814 polyurethane Substances 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 15
- 229920001228 Polyisocyanate Polymers 0.000 claims description 12
- 239000005056 polyisocyanate Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003431 cross linking reagent Substances 0.000 claims description 7
- 238000005304 joining Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- ZHNUHDYFZUAESO-OUBTZVSYSA-N aminoformaldehyde Chemical compound N[13CH]=O ZHNUHDYFZUAESO-OUBTZVSYSA-N 0.000 claims description 3
- 150000001718 carbodiimides Chemical class 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 73
- 239000000203 mixture Substances 0.000 description 26
- 239000011247 coating layer Substances 0.000 description 17
- -1 polyethylene Polymers 0.000 description 17
- 230000000977 initiatory Effects 0.000 description 16
- 229920005862 polyol Polymers 0.000 description 13
- 150000003077 polyols Chemical class 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 239000005026 oriented polypropylene Substances 0.000 description 12
- 239000002904 solvent Substances 0.000 description 12
- 238000003475 lamination Methods 0.000 description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 description 10
- 239000005020 polyethylene terephthalate Substances 0.000 description 10
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 6
- 239000003522 acrylic cement Substances 0.000 description 6
- 150000001991 dicarboxylic acids Chemical class 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 238000003855 Adhesive Lamination Methods 0.000 description 4
- 239000004971 Cross linker Substances 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 4
- 125000004432 carbon atoms Chemical group C* 0.000 description 4
- 150000001735 carboxylic acids Chemical class 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000009459 flexible packaging Methods 0.000 description 4
- 239000000976 ink Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 239000011528 polyamide (building material) Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000005030 aluminium foil Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000001419 dependent Effects 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N precursor Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 3
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 description 2
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N 1,4-Butanediol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 2
- 229920005789 ACRONAL® acrylic binder Polymers 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 108010020147 Protein Corona Proteins 0.000 description 2
- 239000004823 Reactive adhesive Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 230000001143 conditioned Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- QYKIQEUNHZKYBP-UHFFFAOYSA-N vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 2
- 230000003313 weakening Effects 0.000 description 2
- WHGVLEMQINVDLH-OWOJBTEDSA-K (3E)-5-oxopent-3-ene-1,2,5-tricarboxylate Chemical compound [O-]C(=O)CC(C([O-])=O)\C=C\C(=O)C([O-])=O WHGVLEMQINVDLH-OWOJBTEDSA-K 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N 1,2-ethanediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- CDMDQYCEEKCBGR-UHFFFAOYSA-N 1,4-diisocyanatocyclohexane Chemical compound O=C=NC1CCC(N=C=O)CC1 CDMDQYCEEKCBGR-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N 1,6-Hexanediol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229910017107 AlOx Inorganic materials 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N Hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- NAQMVNRVTILPCV-UHFFFAOYSA-N Hexamethylenediamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene (PE) Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 206010063493 Premature ageing Diseases 0.000 description 1
- 108010078762 Protein Precursors Proteins 0.000 description 1
- 102000014961 Protein Precursors Human genes 0.000 description 1
- 229910020230 SIOx Inorganic materials 0.000 description 1
- 210000001138 Tears Anatomy 0.000 description 1
- 229960001124 Trientine Drugs 0.000 description 1
- VILCJCGEZXAXTO-UHFFFAOYSA-N Triethylenetetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 230000001186 cumulative Effects 0.000 description 1
- 150000004292 cyclic ethers Chemical group 0.000 description 1
- 230000001627 detrimental Effects 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- QHZOMAXECYYXGP-UHFFFAOYSA-N ethene;prop-2-enoic acid Chemical compound C=C.OC(=O)C=C QHZOMAXECYYXGP-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000005021 flexible packaging material Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000001264 neutralization Effects 0.000 description 1
- 239000012038 nucleophile Substances 0.000 description 1
- 230000003287 optical Effects 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 239000003211 photoinitiator Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002335 preservative Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000003847 radiation curing Methods 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004544 spot-on Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001360 synchronised Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
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- B32—LAYERED PRODUCTS
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- B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
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- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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- B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
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- B32B2255/205—Metallic coating
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- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
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- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B65D2575/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
- B65D2575/52—Details
- B65D2575/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D2575/586—Opening or contents-removing devices added or incorporated during package manufacture with means for reclosing
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5827—Tear-lines provided in a wall portion
- B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5827—Tear-lines provided in a wall portion
- B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
- B65D75/5838—Tear-lines provided in a wall portion for tearing out a portion of the wall combined with separate fixed tearing means, e.g. tabs
-
- 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
- B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
- B65D77/10—Container closures formed after filling
- B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
- B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
- B65D77/2068—Means for reclosing the cover after its first opening
- B65D77/2096—Adhesive means
-
- 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
Abstract
The present invention is related to a reclosablepackaging container comprising a flexible laminate with a build-in opening and reclose feature, said laminate comprising an inner structure and an outer structure, adhesively joined face-to-face by a permanent adhesive, a pattern of pressure-sensitive adhesive being integrated between said inner and outer structures, the pressure-sensitive adhesive being entirely covered by the permanent adhesive, with the objective of providing improved adhesion of the pressure sensitive adhesive/permanent adhesive layer by having the pressure sensitive adhesive layer protrude higher than the permanent adhesive layer, such that when formed in a roll, extra force is applied to the pressure sensitive adhesive/permanent adhesive layer wherein the outer structure forms the outer surface of the container and the inner structure forms the inner surface of the container, the outer structure comprising an outer flap portion delimited by a scoring linethrough the outer structure, and an inner structure comprising an inner flap portion delimited by a scoring line through the inner structure, the inner score line (6) and the outer score line creating an opening into the container when the flap portions are peeled back, a marginal region of the outer flap portion extending beyond an edge of the inner flap portion and overlying an underlying surface of the inner structure, the inner and outer flap portions being joined with the permanent adhesive and the pressure-sensitive adhesive being disposed between the marginal region of the outer flap portion and the underlying surface of the inner structure for attaching and re-attaching, in use, the outer flap portion to the underlying surface, wherein the sum of the layer thickness of the permanent adhesive and the pressure sensitive adhesion within the pattern is higher than the layer thickness of the permanent adhesive outside the pattern. adhesive being integrated between said inner and outer structures, the pressure-sensitive adhesive being entirely covered by the permanent adhesive, with the objective of providing improved adhesion of the pressure sensitive adhesive/permanent adhesive layer by having the pressure sensitive adhesive layer protrude higher than the permanent adhesive layer, such that when formed in a roll, extra force is applied to the pressure sensitive adhesive/permanent adhesive layer wherein the outer structure forms the outer surface of the container and the inner structure forms the inner surface of the container, the outer structure comprising an outer flap portion delimited by a scoring linethrough the outer structure, and an inner structure comprising an inner flap portion delimited by a scoring line through the inner structure, the inner score line (6) and the outer score line creating an opening into the container when the flap portions are peeled back, a marginal region of the outer flap portion extending beyond an edge of the inner flap portion and overlying an underlying surface of the inner structure, the inner and outer flap portions being joined with the permanent adhesive and the pressure-sensitive adhesive being disposed between the marginal region of the outer flap portion and the underlying surface of the inner structure for attaching and re-attaching, in use, the outer flap portion to the underlying surface, wherein the sum of the layer thickness of the permanent adhesive and the pressure sensitive adhesion within the pattern is higher than the layer thickness of the permanent adhesive outside the pattern.
Description
© pronovem - Office Van Malderen
Lg (LMO/DIH) – January 14th, 2016
LPAMCO0177EP00
E-close option 5
Flexible laminate - reclosable packaging – Overlaying adhesive layers
RECLOSABLE PACKAGING
Field of the Invention
[0001] The present invention is related to reclosable packaging containers
comprising a flexible laminate with a build-in opening and reclose arrangement, and to a
method for the production of this flexible laminate.
State of the Art
[0002] Flexible packaging materials are used in many applications and obtained by
various form fill and seal technologies using laminates of specific constitutions, generally
tailor-made for their specific applications.
Flexible laminates are well known in the flexible packaging industry. The
laminates are usually obtained by adhesive laminations of one or more polymer films
comprising lacquers, barrier layer and metallisation layer, etc. with other possible layers such
as paper, metal foils, and the like. The polymer layer may be extruded, coextruded and/or
joined by permanent adhesive (PA) and/or pressure-sensitive adhesive (PSA), to the final
laminate.
Flexible packages often contain products that may be used progressively over
a longer period of time. If the package is not reclosable, the products are susceptible to
premature aging because they are exposed to the moisture of the surrounding environment.
It is therefore important to be able to correctly reclose a package after its initial opening to
keep the product that remains in the package fresh.
Various build-in opening and reclose arrangements have been developed for
flexible packaging containers in the last decades.
The build-in opening and reclose systems of the prior art are obtained by
specific score lines performed on both sides of the flexible laminate and delimiting adhesive
pattern configurations. Each of those configurations has its specific advantages and
drawbacks.
Nakamura discloses in EP 0 193 130 (1986) one of the first build-in opening
and reclose structures in a laminate.
Alusuisse discloses in EP-A1-0 957 045 (1999) a packaging with a build-in
opening and reclose flap obtained by a laminate comprising pattern-applied permanent and
pressure-sensitive adhesives in register. The laminate comprises an outer structure and an
inner structure. The outer structure comprises a barrier layer. The pressure-sensitive
adhesive can be positioned on the inner or outer structure. The permanent and the pressure-
sensitive adhesives are both applied on the same inner or outer structure and the score lines
are performed separately on the inner structure and on the outer structure of the laminate.
[0009] Alcan discloses in EP-A1-1 449 789 (2004) a packaging with a build-in opening
and reclose flap obtained by a laminate comprising an outer structure and an inner structure.
In a first embodiment, the laminate comprises pattern-applied permanent and pressure-
sensitive adhesives in register, and in a second embodiment a permanent adhesive is applied
on the entire surface on the first structure of the laminate and a pattern-applied pressure-
sensitive adhesive on the second structure of laminate. In this case, the permanent adhesive
and the pressure-sensitive adhesives are superimposed where the PSA is pattern applied and
creates a detrimental local increase of thickness entailing a deformation of the produced reel
of the laminate. The disclosed outer and inner structures may comprise a series of layers,
among them a barrier layer. The pressure-sensitive adhesive can be positioned on the inner
or on the outer structure. The permanent adhesive and the pressure-sensitive adhesive are
both applied separately on the first and second structures of the laminate. The score lines are
performed separately on the inner and outer structures before the structures are joined face
to face and form the laminate.
Sonoco discloses in A1 (2005) a packaging with a build-in
opening and reclose flap obtained by a laminate comprising pattern-applied permanent and
pressure-sensitive adhesives in register. The permanent adhesive does not recover the
pressure-sensitive adhesive. The laminate comprises an outer structure and an inner
structure, the inner structure comprises a seal layer and a barrier layer, in particular a
metallized polymer layer that is able to reflect a laser beam possibly used to perform the
score lines. The pressure-sensitive adhesive remains positioned on the flap after a first
opening. The permanent adhesive and the pressure-sensitive adhesives are both applied in
register on the same first or second structure of the laminate and the score lines are
performed on the finished laminate after joining of the inner and outer structures of the
laminate.
Sonoco, in a divisional application EP-A1-2 243 716 of A1,
claims the replacement of the permanent adhesive by a pressure-sensitive adhesive, wherein
the first and second structures of the laminate are joined by a pressure sensitive adhesive
layer without the use of any permanent adhesive.
Wrigley in A1 (2008) discloses a method for making a
flexible build-in opening and reclose feature in a laminate comprising pattern-applied
permanent adhesive and a strip of pressure-sensitive adhesive in register in the marginal
region between the score lines. The laminate comprises a first structure and a second
structure. The first structure is independently scored before joining the second structure and
forming a laminate. The second score line is then performed on the laminate.
Printpack Illinois discloses in A1 (2010) a reclosable
container with build-in opening and reclose feature based on the inner and outer sides of a
laminate with a resealable cover portion and a pressure-sensitive adhesive affixing the inner
side to the outer side. Here, the basic difference compared to the mentioned prior art before
2010 is that the permanent adhesive is replaced by a heat seal.
Avery Dennison in A1 (2011) discloses a resealable
packaging laminate with a build-in opening and reclose arrangement comprising an outer and
an inner laminate portion. The outer and inner score lines being arranged to define a
marginal region comprising a pressure-sensitive adhesive at least partly in contact with a
release layer positioned on the inner layer.
Hochland in EP-A1-2 347 972 (2011) discloses a reclosable packaging, in
particular a lid for a tray, with a build-in opening and reclose arrangement comprising a
rupturable weakening line in the lid. The lid is obtained by a laminate comprising permanent
adhesive in the central area of the lid and pressure-sensitive adhesive in the border area of
the lid. The outer structure comprises among other possible layers a barrier layer.
Other laminates, specifically related to cigarette-pack inner or outer wrapper
comprising similar build-in opening and reclose arrangements are disclosed by BAT in
WO 98/22367 and or by Focke in and .
Sonoco in EP-A1- 2 257 479 (2010) discloses a flexible packaging laminate
having built-in opening/reclose and tamper-evidence features by forming the laminate from
an outer structure joined in face-to-face relation to an inner structure. Score lines are formed
in both structures to enable an opening to be formed through the laminate by lifting a flap
out of the plane of the laminate. The score line through the outer structure defines a larger
opening than the score line through the inner structure, such that a marginal region of the
outer structure extends beyond the edge of the opening portion of the inner structure. A
pressure-sensitive adhesive is used to re-adhere the marginal region to an underlying surface
of the inner structure adjacent the opening through the laminate. The outer score line
includes at least one tear portion that is torn through upon initial opening, thus indicating the
package has been at least partially opened.
Avery Dennison in EP-A1-2 323 921 (2011) discloses a resealable container
having an easily accessed yet airtight seal via the use of a tamper evident rupture strip which
provides the container or package with improved shelf life for the product contained therein.
Amcor in A1 (2015) discloses a reclosable packaging
container comprising a flexible laminate with a build-in opening and reclose feature in the
form of a flap, said laminate comprising an inner structure and an outer structure adhesively
joined face-to-face by a permanent adhesive, a pattern of pressure-sensitive adhesive being
integrated between said inner structure and said outer structure, the pressure-sensitive
adhesive being entirely covered by the permanent adhesive, a marginal region delineated by
inner and outer score lines comprises the pressure-sensitive adhesive overlaying the
permanent adhesive in an imprint region of reduced permanent adhesive thickness, the
cumulative thicknesses of the pressure-sensitive adhesive and of the permanent adhesive in
the imprint region being substantially the same as the thickness of the permanent adhesive
outside this region.
None of the prior art documents uses a pattern of pressure sensitive
adhesive, entirely covered by permanent adhesive, wherein the sum of the thickness of
pressure sensitive adhesive and permanent adhesive is substantially higher than the
thickness of permanent adhesive outside said pattern.
Aim of the Invention
The present invention aims to provide an alternative to the existing packages
with build-in opening and reclose feature and a method for the production of the laminate
presenting specific advantages over the above-mentioned prior art.
Summary of the Invention
The present invention discloses a reclosable packaging container comprising a
flexible laminate with a build-in opening and reclose feature , said laminate comprising an
inner structure and an outer structure, adhesively joined face-to-face by a permanent
adhesive , a pattern of pressure-sensitive adhesive being integrated between said inner and
outer structures in the region of the build-in opening and reclose feature , the pressure-
sensitive adhesive being entirely covered by the permanent adhesive , the outer structure
forming the outer surface of the container and the inner structure forming the inner surface
of the container, the outer structure comprising an outer flap portion delimited by a scoring
line through the outer structure, and an inner structure comprising an inner flap portion
delimited by a scoring line through the inner structure, the inner score line and the outer
score line creating an opening into the container when the flap portions are peeled back, a
marginal region of the outer flap portion extending beyond an edge of the inner flap portion
and overlying an underlying surface of the inner structure , the inner and outer flap portions
being joined with the permanent adhesive and the pressure-sensitive adhesive being
disposed between the marginal region of the outer flap portion and the underlying surface of
the inner structure for attaching and re-attaching, in use, the outer flap portion to the
underlying surface, the laminate being characterized in that the ratio of the sum of the
thicknesses of the superposed permanent adhesive and the pressure sensitive adhesive in the
pattern to the thickness of the permanent adhesive outside the pattern is at least 1.3,
preferably at least 2.0, more preferably at least 2.5, most preferably at least 3.0.
Preferred embodiments of the laminate for the reclosable packaging
container as in the present invention disclose at least one or a combination of the following
features:
− the thicknesses of the permanent adhesive outside the pattern is comprised between
0.5 and 10 µm, preferably between 1.0 and 7.0 µm, more preferably between 1.5 and
.0 µm;
− the pattern is characterized in that the thickness of the permanent adhesive is
comprised between:
• 0.5 and 10 µm when the thickness of the pressure sensitive adhesive is comprised
between 2 and 10 µm;
• preferably between 1.0 and 7.0 µm when the thickness of the pressure sensitive
adhesive is comprised between 2.5 and 7.0 µm;
• more preferably between 1.5 and 5.0 µm when the thickness of the pressure
sensitive adhesive is comprised between 3.0 and 5.0 µm;
− the thickness of the permanent adhesive in the pattern is lower than the thickness of the
permanent adhesive outside the pattern, the lower thickness of the permanent adhesive
in the pattern forming a recess for the pressure sensitive adhesive ;
− the ratio of the thickness of the pressure-sensitive adhesive to the thickness of the
permanent adhesive in the pattern is comprised between 1 and 9, preferably between 1
and 7, more preferably between 1 and 4;
− the thickness of the permanent adhesive outside the pattern is comprised between 1.5
and 3.5 µm when the thickness of the pressure sensitive adhesive in the pattern is
comprised between 2.5 and 6 µm;
− the permanent adhesive comprises one or more (co)polymers selected from the group
consisting of polyurethane, acrylic, alkylene vinyl alkanate and alkylene allyl alkanate;
− the pressure sensitive adhesive comprises one or more one or more (co)polymers
selected from the group consisting of acrylic, alkylene vinyl alkanate and alkylene allyl
alkanate acrylic;
− the pressure sensitive adhesive is a water-based adhesive characterized by a solid
content comprised between 25 and 80% by weight, preferably between 30 and 75% by
weight, more preferably between 35 and 70% by weight;
− the permanent adhesive comprises one or more crosslinking agents selected from the
group consisting of non-blocked polyisocyanate, blocked polyisocyanate, C1-C4
alkoxylated amino formaldehyde and carbodiimide;
− one of the inner or outer structures of the laminate additionally comprises a pattern of
release coating in an opening-initiation zone adjacent to the pressure-sensitive adhesive
pattern , said release coating being entirely covered by the permanent adhesive ;
− the inner structure includes a layer of sealable material, said sealable material being a
sealable polymer or a sealable coating;
− the inner structure and/or the outer structure include(s) a barrier layer;
− the flexible laminate with a build-in opening and reclose feature is a lid.
[0024] The present invention further discloses a method for making the flexible
laminate for the packaging container of the present invention, said laminate having a built-in
opening and reclose feature , said method comprising the steps of:
− pattern-applying a pressure sensitive adhesive onto one surface of the inner or outer
structure ;
− applying a permanent adhesive onto at least 85% of the entire surface of the inner or
outer structure, the permanent adhesive entirely covering the pressure sensitive
adhesive before or after adhesively joining the inner structure to the outer structure;
− scoring the inner and outer structures by a scoring station before or after adhesively
joining the inner structure to the outer structure face to face via the permanent
adhesive to form the laminate, an outer score line being formed through the thickness of
the outer structure in registration with the outer perimeter of the pressure sensitive
adhesive , and an inner score line being formed through the thickness of the inner
structure in registration with the inner perimeter of the pressure sensitive adhesive , the
marginal region of the outer opening portion between the outer and inner score lines
being attached to an underlying surface of the inner structure via the pressure sensitive
adhesive.
[0025] A preferred embodiment of the method for making the flexible laminate of
the packaging container as in the present invention discloses applying the layer of permanent
adhesive with recesses in the pattern region, the pressure sensitive adhesive being pattern
applied in a separate step on said recesses.
Brief Description of the Drawings
Fig.1 is a view of the build-in opening and reclose feature with a pressure
sensitive adhesive region surrounding the opening and an optional release-coating layer
region remaining on the inner structure of the laminate after opening.
Fig.2 is a view of the build-in opening and reclose feature with a pressure
sensitive adhesive region and an optional release-coating region on the opening initiation
(grasping portion), both remaining on the outer structure (flap) of the laminate after opening.
Fig.3 is a view of a standing pouch comprising a build-in opening and reclose
feature as in the invention, where the pressure sensitive adhesive and an optional release-
coating layer, positioned on the opening initiation, remains on the outer structure after
opening.
Fig.4 is a view of a flow pack comprising a build-in opening and reclose
feature as in the invention, where the pressure sensitive adhesive and the optional release-
coating layer on the opening initiation remains on the inner structure after opening.
Figs.5 and 6 show a tray comprising a build-in opening and reclose
arrangement as in the invention on its lid. The pressure sensitive adhesive and the optional
release-coating layer of the opening initiation remain on the outer structure after opening.
Fig.7 represents a section of the laminate wherein the pressure sensitive
adhesive, pattern applied on the inner structure is entirely covered with a permanent
adhesive with uniform layer thickness.
Fig.8 represents a section of the laminate wherein the pressure sensitive
adhesive, pattern applied on the inner structure is entirely covered with a permanent
adhesive said permanent adhesive having a lower thickness (recesses) in the pattern region
for the emplacement of the pressure sensitive adhesive..
Fig.9 represents a section of the laminate wherein the pressure sensitive
adhesive, pattern applied on the outer structure is entirely covered with a permanent
adhesive said permanent adhesive comprising also recesses for the pressure sensitive
pattern.
[0035] Fig.10 represents a detailed view of the adhesive layer in the pattern region
disclosing the respective thickness ranges of PA and PSA and their ratios.
Fig.11 represents a side view of a first lamination arrangement and a top view
of the laminate obtained thereby.
Fig.12 represents a side view of a second lamination arrangement and a top
view of the laminate obtained thereby.
Fig. 13 represents a side view of a third lamination arrangement and a top
view of the laminate obtained thereby.
Fig. 14a) and 14b) show a schematic view of two additional embodiments for
the production of the laminate of the packaging container of the present invention, wherein
two additional positions of scoring stations are disclosed.
1. Build-in opening and reclose feature
2. Pattern-applied pressure-sensitive adhesive (PSA)
3. Permanent adhesive (PA)
4. Release-coating layer or permanent adhesive free region for the opening initiation
. Scoring line of the outer structure
6. Scoring line of the inner structure
7. Opening initiation (dead zone)
8. Outer structure of the laminate
9. Inner structure of the laminate
. Barrier layer
11. Lamination station
12. Oven
13. Scoring station (laser, kiss cutting …) with eye mark/scoring coordination
14. PSA applicator
. PA applicator
16. Release layer applicator (optional)
17. Marginal region
Description of the Invention
The present invention discloses a flexible packaging container formed by a
laminate having a built-in opening and reclose feature 1, the laminate comprising a two-part
structure, namely an outer structure 8 joined in face-to-face relation with an inner structure
9. The adjectives “inner” and “outer” are related to the position in the packaging container,
the inner structure 9 being in contact with the content of the packaging container and the
outer structure 8 being in contact with the environment. Inner and outer structures can also
be named first and second structures of the laminate.
At least one of both structures (8, 9) comprises a pattern-applied pressure-
sensitive adhesive (PSA) 2 and/or a permanent adhesive (PA) 3 on an important part of the
entire surface. Once both structures (8, 9) are joined by lamination, the patterned PSA is
entirely covered by the PA.
[0043] The region covered by both adhesives is characterized by a total adhesive
layer thickness of 20 µm or less, preferably 17 µm or less, more preferably 14 µm or less and
most preferably 11 µm or less, wherein the ratio of the layer thickness of the PSA over the
layer thickness of the PA is comprised between 1 and 9, preferably between 1 and 7 more
preferably between 1 and 4 and wherein the sum of the thicknesses of the PA and PSA in the
pattern to the PA thickness outside the pattern is at least 1.3, preferably at least 2.0, more
preferably at least 2.5 and most preferably at least 3.0.
The pattern region further is characterized in that the thickness of the
PA 3 is comprised between:
- 0.5 and 10 µm when the thickness of the PSA is comprised between 2 and 10;
- preferably between 1.0 and 7.0 µm when the thickness of the PSA is comprised between
2.5 and 7.0 µm;
- more preferably between 1.5 and 5.0 µm when the thickness of the PSA is comprised
between 3.0 and 5.0 µm.
The inventors have observed that for a PSA thickness lower than 2 µm, an
efficient reclosing of the reclosable opening feature is difficult.
The combined adhesive thickness in the pattern being higher than the PA
thickness outside the pattern results in an embossment of the laminate at the side of the
inner structure 9 and of the outer structure 8.
Once the laminate being wound to form a roll, said embossments create an
extra pressure on the PSA pattern. It has been observed that a few days ageing of the
laminates in rolls improves the pressure sensitive adhesive properties. The inventors have
surprisingly found that the extra pressure, resulting from the embossments, has a positive
effect on the PSA efficiency.
Moreover the inventors have observed an easier opening and a more
efficient reclosing of the reclosable opening feature, for a combined adhesive thickness in the
pattern being higher than the PA thickness outside the pattern.
The inner and outer structures (8,9) of the laminate include usual lamination
structures. The outer structure generally exhibits a printable polymer layer, sometimes
associated to a paper layer. Reverse printing is often preferred. Barrier layer 10 such as
oriented polyamide (OPA) or EVOH, aluminium foils and the like are usual constituents. The
inner structure 9 often comprises a polyolefin seal layer, sometimes associated to support
layer, among them oriented polymers like OPP, OPA, OPET, … Substantially all combinations
are possible and well known by those skilled in the art.
The number of constituents of a laminate are mainly governed by their
specific function in the laminate, by lamination facilities and by price considerations.
Technically, almost all combinations are possible.
A score line, defined here as a line of weakness or a trough cut, is formed in
the outer structure (outer score line 5) to define an outer opening portion and an inner line
of weakness or a trough cut is formed in the inner structure (inner score line 6) to define an
inner opening portion. The outer and inner opening portions are attached to each other by a
PA, except in the marginal region 17 that extends beyond the peripheral edge of the inner
opening portion between the outer and inner cut or weakening lines, where a PSA pattern is
applied and superposed on the permanent adhesive 3.
The permanent adhesive 3 covers at least 85%, preferably at least 90%, more
preferably at least 95% of the entire surface of one of the outer or inner structures (8,9). The
remaining part of the surface, being PA -free, is patterned and may serve as opening
initiation. For the particular case where the PA covers about 100% of the entire surface of the
inner or outer structure, a release coating pattern 4, for the opening initiation, is pattern-
applied. In the present invention it is preferred to use a patterned PA-free region as opening
initiation.
[0053] The PSA pattern 2 is entirely covered by PA layer 3; independently on
- whether the PSA is first pattern applied on the inner or the outer structure, followed by
the application of PA over at least 85% of the entire surface of the inner or outer
structure, or
- whether the PA is first applied over at least 85% of the entire surface of the inner or the
outer structure followed by the patterned application of the PSA ,
the PSA patterns will be entirely covered by the PA layer, while the PA layer will be patterned
covered by PSA before or after joining to form the laminate.
As far as the outer and inner opening portions are connected by a PA , they
can be lifted out of the plane of the build-in opening as a flap, thereby creating an opening
through the packaging structure defined by the inner line of weakness (see Figs. 1 to 6).
After a first opening, the flap created by the connection of the inner and
outer portions can be reclosed by adhering the marginal region 17 of the outer opening
portion to the underlying portion of the inner structure 9 via the PSA . This PSA can be
positioned on the outer or the inner structure (8,9), both positions having their advantages
and drawbacks. Positioned on the inner structure 9, the PSA is often rapidly contaminated by
the content of the package, such as confectionary articles or biscuits, etc. Positioned on the
outer structure 8, the PSA is possibly passivized by finger contact. The choice of the position
of the PSA is therefore conditioned by the content of the packaging and the requirements of
the end-user.
[0056] The manufacturing processes of the present invention are shown in Figs. 11,
12 and 13.
In one embodiment of the invention depicted in Fig.11, the PSA and
optionally the release-coating layer 4 covering the opening initiation 7, are pattern applied
onto the inner structure 9 of the laminate, and the PA is applied onto the outer structure 8
over at least 85% of the entire surface, such that the PA covers the pattern-applied PSA and
the optional release-coating layer 4 once the first and second structures (8,9) are adhesively
joined to form the laminate.
[0058] In another embodiment of the invention depicted in Fig.12, the PSA and
optionally the release-coating layer 4 covering the opening initiation 7, are first pattern
applied onto one surface of the outer or inner structure (8,9) of the laminate. The PA is then
applied over at least 85% of the entire surface of the same structure such that the PA covers
the pattern-applied PSA and the optional release-coating layer 4, before the first and second
structures are adhesively joined to form the laminate.
In an additional embodiment depicted in Fig.13, the PA is first applied onto at
least 85% of the entire surface of the outer or inner structure (8,9) of the laminate, the PSA
and an optional release-coating layer 4 covering the opening initiation 7 are then pattern
applied onto the PA on the same structure of the laminate before the first and second
structures are adhesively joined to form the laminate.
In each of the above embodiments the PA layer has a thickness which is
substantially the same everywhere and may comprise an recess region wherein the thickness
of PA is reduced, said recess region corresponding to the pattern for PSA and optional release
coating 4 application.
[0061] The outer and inner structures (8,9) are preferably supplied from rolls and
have substantially the same width. Once laminated face to face, both structures form a
laminate that is a continuous web to be supplied to the final packaging station.
One or both of the inner and outer structures (8, 9) or the adhesively
assembled laminate are then scored at a scoring station 13 where an outer score line 5 is
formed through the thickness of the outer structure 8 in registration with the outer
perimeter of the pattern-applied PSA and possibly release-coating layer 4 if an opening
initiation 7 is present, and an inner score line 6 is formed through the thickness of the inner
structure 9 in registration with the inner perimeter of the PSA layer 2. The score lines (5, 6)
can be formed by laser scoring, die cutting or kiss cutting, or any other available method well-
known in the art. Various scoring positions are disclosed in Figs. 11, 12 and 14. The position of
the scoring station, in case of laser scoring, is principally conditioned by the presence or not
of a barrier layer that is able to stop or to reflect the laser beam.
To maintain the outer and inner score lines (5, 6) in registration around the
PSA and the optional release layer 4 pattern (outer and inner perimeters of both), the scoring
operation is synchronized with the advancement of the laminate by means of an optical
sensor detecting an eye mark sequence on the laminate, whose location in relation to the
PSA and optional release-coating layer 4 pattern is known.
In case of laser cutting, the depth and width of the score line can be adjusted
by regulating the power output of the beam and the residence time of a given spot on the
film surface. These parameters are selected in combination with the material to be scored.
Some materials are more receptive than others to laser energy - see for instance
US 3,909,582 and US 5,158,499 giving extensive information on laser-cutting technology.
Furthermore, various combinations of mechanical and laser scoring are
possible. One possibility is for instance to laser-score one side of the laminate and to
mechanically cut the other side if one of both structures is not laser-scorable, for instance in
the case of a non-absorbing seal layer, such as polyethylene without reflective barrier layer
behind.
The adhesives can be applied using any suitable equipment and technique
known in the art such as gravure roll for instance.
In the final laminate, the outer opening portion bonded by the PA to the
inner opening portion is peelable from the underlying surface of the inner structure 9
allowing both portions to be peeled back and to create a reclosable opening. The marginal
region 21 formed between the outer and inner score lines (5, 6) on the outer opening
portion, is re-attachable to an underlying surface of the inner structure 9 by the PSA.
The inner structure 9 of the laminate comprises one or more of a sealant or
support layer(s) (17, 18) forming the inner surface of the laminate. Sealant layers are well
known in the art and comprise heat-seal material such as heat-seal lacquer, LDPE, HDPE, EVA,
polypropylene, polyolefin copolymers in general, ionomers or cold-seal materials.
The inner and outer structures (8, 9) can also comprise one or more barrier
layer(s) 10 known in the art such as metallized polyolefin films, for instance metallized
oriented polypropylene (oPP), ethylene vinyl alcohol copolymer (EVOH), oriented polyamide
(oPA). Other possibilities are ceramic-coated films like AlOx or SiOx - coated polymer films,
aluminium foil and prelaminates comprising aluminium foil and one or more polymer films.
A combination of barrier coatings, such as a ceramic coating and a polyvinyl alcohol coating
preferably may be used for providing barrier properties to laminates preferably transparent
laminates.
The multilayer structure comprises one or more of the following layers:
- oriented polypropylene (oPP, 6-40µm);
- high-density polyethylene (HDPE, 15 to 150 µm);
- polystyrene (PS, 15-40 µm);
- oriented polyamide (oPA, 8-40 µm);
- polyester such as polyethylene terephthalate (PET, 6 to 50 µm);
- paper;
- Aluminium;
- Seal layer ( LDPE. Copo ethylene-propylene….).
All the layers of the inside or outside structures (8, 9) can be laminated by
means of adhesives or coextruded with possible tie layer if necessary. The methods for all
possible combinations are known in the art.
In the lamination process, the outer structure 8 is provided from a supply roll
to a print station for printing graphics and/or indicia on it (not shown). This can be achieved
by means of a rotogravure printer. In an embodiment of the invention, the inks are applied
on the outer surface of the outer structure 8. In another embodiment of the invention, the
outer structure 8 includes a transparent layer such as a PET layer that is reverse-printed,
which means that the inks are applied to the surface of the transparent layer, which is
subsequently laminated to another structure, the inks are visible through the first structure
by transparency. An additional embodiment comprises a combination of printing on the outer
surface of the outer structure and reverse printing.
[0073] The surface of the outer structure 8 can be treated by corona discharge or
flame treatment just prior to printing in the print station or even in an earlier production
step. The corona treatment is typically used in the art to render the surface more receptive to
the inks and/or to increase the affinity of the surface to the PSA and to the optional release-
coating layer 4 that is subsequently pattern-applied to the surface (see Fig.11). The higher
affinity to the PSA and the optional release layer coating 4 in case of the presence of an
opening initiation 7 is automatically obtained when the PSA/optional release layer is directly
pattern applied on the PA such as shown in Fig.13. This is a particular advantage of this
embodiment.
After the optional corona and printing operation, the inner and outer
structures (8,9) are submitted to application stations of PA , PSA and optional release coating
4 in various orders depending on the chosen embodiments.
The embodiment described in Fig.10 first applies an optional release pattern
and then a PSA pattern on the inner structure 9. At the same time the PA is applied on at
least 85% of the entire surface of the outer surface 8.
The embodiment described in Fig.12 first applies an optional release coating
4 pattern and then a PSA pattern on the inner structure 9 followed by PA application on at
least 85% of the same inner structure.
[0077] The embodiment described in Fig.13 first applies PA on at least 85% of the
entire surface of the inner structure 9. An optional release-coating pattern 4 and a PSA are
then applied to the same inner structure 9 on top of the PA creating a limited extra-thickness
on this location.
In the present invention, independently of the embodiment, one side of the
PSA patterned layer is always in contact with one side of the inner 9 or outer 8 structure,
while the other side of the patterned PSA layer always is in contact with the PA , said other
side of the PSA layer being completely covered by PA . On the one hand PA is from one side
of its layer, in contact with the outer structure 8 and with the other side of its layer with the
inner structure 9 except for the PSA and optional release coating patterns. On the other hand
PA is from one side of its layer, in contact with the inner structure 9 and with the other side
of its layer with the outer structure 8 except for the PSA and optional release coating
patterns.
The PA layer may have a substantially uniform layer thickness over at least
85% of entire surface of the inner 9 or outer 8 structure, but preferably comprises a recess
region wherein the thickness of PA is reduced, said recess region corresponding to the
pattern for PSA and optional release coating 4. Combining PA and PSA in the recess region
results in a patterned region, wherein total adhesive thickness (sum of PA thickness and PSA
thickness exceeds the thickness of the PA layer outside that region and wherein the ratio of
the sum of the thicknesses of PA and PSA to the PA thickness outside the patterned region is
at least 1.3, preferably at least 2.0, more preferably at least 2.5 and most preferably at least
3.0.
All possible applying combinations can of course be contemplated for the PA,
PSA and the optional release-coating layer 4. Instead of applying the release-coating layer 4
and PSA pattern on the inner structure 9, they could be applied to the outer structure 8 and
the PA on the inner structure 9. All of them could also be applied to the outer structure 8.
The chosen option is irrelevant as long as no substantial extra thickness is created by the
overlapping of the PA layer and the PSA/optional release layer. A too big extra thickness
would lead to an undesirable bump or mark on the reel of laminate.
The adhesives for being used in the present invention are solvent based,
water-based or high solids.
The solvent based adhesive comprises between 20 and 60% by weight,
preferably between 25 and 55% by weight of one or more polymer(s) and others adhesive
components such as fillers and tackifiers among others.
The water-based adhesive in general is an aqueous dispersion, substantially
free of organic solvents and comprising from 20 to 80% by weight, preferably from 25 to 75%
by weight, more preferably from 30 to 70 % by weight of one or more polymer(s) and other
adhesive components such as fillers and tackifiers among others.
[0084] The high solid adhesive in general comprises less than 20% by weight,
preferably less than 15% by weight, more preferably less than 10% by weight, most
preferably less than 5% by weight or even less than 1% by weight of organic solvent. The high
solid adhesive is substantially organic solvent-free.
The one or more polymer(s) of the adhesives of the present invention
preferably are selected from the group consisting of (co)polymers composed of a carbon
backbone and/or polyurethane copolymers.
The PSA is characterized by a bond/peel strength which is lower than the
bond/peel strength of the PA , the difference between both being at least 0.5 N/15 mm
measured according to ASTM F904-1998 (reapproved 2008).
[0087] ASTM F904 - Standard Test Method for Comparison of Bond Strength or Ply
Adhesion of Similar Laminates Made from Flexible Materials – wherein separated plies of a
test specimen are placed into the grips of a tensile testing machine and wherein the grips
then are separated. The force required to 76.2 mm of the test specimen is defined as the
bond strength.
[0088] For example, the bond/peel strength of the permanently tacky PSA towards,
a metallised surface of an oriented polypropylene film, should be lower than 1.3 N/15 mm,
preferably lower than 1.1 N/15 mm, more preferably lower than 0.9 N/15mm, whereas the
bond/peel strength of the PA towards a metallised surface of an oriented polypropylene film
should be higher than 1.50 N/15 mm, preferably higher than 1.6 N/15mm, more preferably
higher than 1.8 N/15 mm and can be as high as 3.0 N/15 mm. Other surfaces could provide
higher or lower levels of bond/peel strength, yet the bond/peel strength of the PA always
should be higher than the bond/peel strength of the PSA, the difference between both being
at least 0.5 N/15mm.
PSA form viscoelastic bonds that are permanently tacky and adhere under
simple finger pressure, whereas PA has no permanent tackiness.
The bond/peel strength of the adhesive is obtained from the adhesive
composition as such, i.e. from the different components as originally present in the adhesive
formulation preferably after evaporation of water and/or organic solvents, or is determined
by the components of the adhesive composition and the degree of their further conversion,
preferably after application. Furthermore the bond/peel strength will depend on the type of
bonded substrates.
Said further conversion preferably is accomplished by subjecting the adhesive
formulation to heat and/or actinic irradiation preferably after evaporation of water and/or
organic solvents.
The (co)polymers composed of a carbon backbone preferably are obtained
from the polymerization of one or more ethylenically unsaturated monomer(s) selected from
the group consisting of C1-C20-alkyl (meth)acrylates, vinyl and allyl esters of carboxylic acids
of up to 20 carbon atoms, vinyl ethers of C1-C8 alcohols, vinyl aromatics of up to 20 carbon
atoms, ethylenically unsaturated nitriles, vinyl halides, C1-C10-hydroxyalkyl(meth)acrylates,
C1-C10-acetoacetoxyalkyl(meth)acrylates, (meth)acrylamide, (meth)acrylamide substituted
on the nitrogen by C1-C4-alkyl, ethylenically unsaturated carboxylic acids, ethylenically
unsaturated dicarboxylic acids, half-esters of ethylenically unsaturated dicarboxylic acids,
anhydrides of ethylenically unsaturated dicarboxylic acids, non-aromatic hydrocarbons having
at least two conjugated double bonds, C1-C8 alkenes and mixtures of these monomers.
Said (co)polymers preferably comprise from 60 to 100% by weight of one or
more monomers selected from the group consisting of C1-C20-alkyl (meth)acrylates and vinyl
and allyl esters of carboxylic acids of up to 20 carbon atoms.
[0094] The one or more polymers further comprise from 0 to 40% by weight of one
or more monomers selected from the group consisting of vinyl ethers of C1-C8 alcohols, vinyl
aromatics of up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl halides C1-C10-
hydroxyalkyl(meth)acrylates, C1-C10-acetoacetoxyalkyl(meth)acrylates, (meth)acrylamide,
(meth)acrylamide substituted on the nitrogen thereof by C1-C4-alkyl, ethylenically
unsaturated carboxylic acids, ethylenically unsaturated dicarboxylic acids, half-esters of
ethylenically unsaturated dicarboxylic acids, , anhydrides of ethylenically unsaturated
dicarboxylic acids, non-aromatic hydrocarbons having at least two conjugated double bonds,
C1-C8 alkenes and mixtures of these monomers.
The adhesives comprising (co)polymers comprising reactive groups, such as
hydroxyl-, carboxyl-, and/or acetoacetoxy functional groups can further be converted after
application through reaction of the polymers’ functional groups with one or more crosslinking
agents.
[0096] Preferred crosslinking agents are polyisocyanate, carbodiimide or lower
alkoxylated amino formaldehyde crosslinking agents.
Crosslinking agents may be added in an amount of up to 35% by weight,
preferably preferably of up to 30% by weight, more preferably of up to 25% by weight of the
total weight of the one or more polymer(s) comprising one or more reactive sites and
crosslinking agents.
The polyurethane copolymers preferably are obtained from the reaction of
one or more polyols, and optionally one or more chain extenders, with one or more organic
polyisocyanate(s).
Examples of polyols are polyester polyols, polyesteramide polyols, polyamide
polyols, polyether polyols, polyurethane polyols, silicon comprising polyols and rubber
polyols having a number average molecular weight comprised between 500 and 15,000
g/mole, preferably between 1000 and 10,000 g/mole, more preferably between 2,000 and
8,000 g/mole.
Examples of chain extenders are low molecular weight polyols such as
ethylene glycol, 1,4-butanediol, 1,6-hexandiol and trimethylolpropane, and low molecular
weight diamines such as ethylene diamine hexamethylene diamine, isophorone diamine
and.triethylene tetramine.
Examples of polyisocyanates are:aliphatic diisocyanates such as
hexamethylene diisocyanate; alicyclic diisocyanates such as 1,4-cyclohexane diisocyanate;
aromatic diisocyanates such as 2,4- or 2,6-tolylene diisocyanate; aromatic aliphatic
diisocyanates such as 1,3- or 1,4-bis(1-isocyanatemethylethyl)benzene; organic
triisocyanate such as triphenylmethane-4,4',4''-triisocyanate; organic tetraisocyanate such as
4,4'-diphenyldimethylmethane-2,2'-5,5'-tetraisocyanate; dimers or trimers derived from the
above polyisocyanates.
The polyurethane (co)polymers may comprise terminal hydroxyl or
isocyanate groups.
[0103] The hydroxyl-functional polyurethane (co)polymers may contribute to the
adhesive properties without any further conversion, but preferably are further reacted with
one or more polyisocyanates.
The isocyanate-functional polyurethane (co)polymers preferably are further
converted through reaction with one or more nucleophiles, such as a polyol, an urea or
water.
The molecular weight of the (co)polymers, as present in the original adhesive
formulation and their subsequent optional further conversion as well as the degree of said
conversion, in order to get the adequate final bond/peel strength, in general is dependent on
whether a solvent based, water based or high solid adhesive is concerned.
[0106] The value of the bond/peel strength after application and optional conversion
determines whether it is a permanent adhesive or a pressure sensitive adhesive.
For the particular case of water-based adhesives the (co)polymers are made
water dispersible by the incorporation of anionic, cationic, nonionic moieties or a
combination thereof into their backbone. Preferably the moieties are anionic or non-ionic.
[0108] The adhesive formulations comprising (co)polymers having reactable groups
in general are further converted from a 2-component system where the reactive groups and
the crosslinker are mixed preferably just before application, or from a 1-component system
comprising a storage stable mixture comprising one or more (co)polymers having reactable
groups and one or more crosslinker.
[0109] In general the polyurethane comprising adhesives are obtained from reaction
of one or more polyols with one or more polyisocyanates either in a 2-component system
where the polyols and polyisocyanates are mixed preferably just before application, or in a 1-
component system comprising a storage stable mixture comprising one or more polyols and
one or more of the above isocyanates or from one or more polyurethane copoplymers, as
such without any further conversion.
The polyisocyanate crosslinker for being used in both, the one- and the two-
component adhesive systems adhesives preferably are blocked.
A solvent-free adhesive in general is obtained from the conversion of a
reactive fluid adhesive precursor, for example through thermal activation and/or actinic
radiation.
The reactive adhesive precursor preferably is blend of one or more
(co)polymer(s) composed of a carbon backbone and/or polyurethane copolymer(s), one or
more coreactable monomers and one or more crosslinkers, selected and mixed in such a way
that a workable adhesive formulation is obtained.
The (co)polymers or the reactive adhesive precursors and coreactable
monomers for being used in the water- or solvent-based or high solid adhesive formulations
of the present invention, also may be functionalised by ethylenically unsaturated groups or
cyclic ether groups for being further converted, preferably under the influence of actinic
irradiation, through radical and cationic initiation respectively. The selection of suitable
photoinitiators and optional photoactivators, dependent of the irradiation source and the
mechanism of initiation, is obvious for the one skilled in the art of radiation curing.
[0114] In addition to the (co)polymers, the adhesive composition further may
comprise one or more fillers and one or more tackifiers. Examples of fillers are finely milled or
precipitated chalks, dolomite, quartz powder and silica flour.
The composition may furthermore contain wetting agents or dispersants, for
example for the fillers thickeners and further conventional additives, such as antifoams and
preservatives.
To the adhesive formulation, in particular PA further may comprise one or
more adhesion promotors. Preferred adhesion promotors are preferred copolymers are
ethylene-acrylic acid copolymers and ethylene vinylacetate copolymers or sylanic polymers
The adhesive and release-coating layer 4 applying stations (14,15,16) are
complemented by drying means such as ovens or infra-red heater for instance, allowing the
applied adhesives to be in good condition for the next manufacture step (lamination or
additional application of adhesives or release-coating layer).
The packaging container of the invention comprising the laminates with a
build-in open and reclose feature made as in the invention provides a tamper-evidence
function because it is very difficult to replace the opening portions after initial opening
exactly on the same place as before the opening. When the outer layer of the outer structure
8 is printed, in particular if it is reverse printed, it is almost impossible to achieve perfect
registration of the printed matter across the score line when reclosing the package.
The packages as in the invention not only encompass flow packs or pouches
(Figs.3 and 4) but also lidding for tray or other container (Figs.5 and 6). In this manner, the lid
includes a built-in reclosable opening. Enveloped pack, cigarette packs….
[0120] The following illustrative examples are merely meant to exemplify the
present invention but are not destined to limit or otherwise define the scope of the present
invention.
Duplex structure
Example 1 corresponds to the embodiment as shown in Fig. 11.
[0121] A solvent based 2-component polyurethane permanent adhesive (Loctite
Liofol LA3644/LA6055 from Henkel) was applied over the entire surface of a polyethylene
terephthalate film of 23 µm.
In the same working step, a water based pressure sensitive acrylic adhesive (Acronal V215
from BASF) was pattern applied on a metallized oriented polypropylene film of 35 µm (QCM
from Treofan)
After flashing off the solvent and water in an infrared oven, the polyethylene terephthalate
film of 23 µm comprising the permanent adhesive layer with a thickness of 1.5 µm and the
metallized polypropylene film of 35 µm comprising the pressure sensitive adhesive patterns
with a thickness of 4.4 µm were then adhesive laminated to create a duplex structure.
Example 2 corresponds to the embodiment as shown in Fig. 12.
Example 1 was reproduced with the difference that the water based pressure
sensitive acrylic adhesive first is pattern applied on the metallized oriented polypropylene
film of 35 µm and a bigger solvent based 2-component polyurethane adhesive was applied
over the entire surface of the metallized polypropylene film of 35 µm comprising the
patterned pressure sensitive adhesive. After flashing of the solvent, a polyethylene
terephthalate film of 23 µm and the metallized oriented polypropylene film of 35 µm,
comprising the pattern applied pressure sensitive adhesive, with a thickness of 4.4 µm,
completely covered by permanent adhesive with a layer thickness of 4.2 µm, were adhesive
laminated to create a duplex structure.
Example 3 corresponds to the embodiment as shown in Fig. 13.
Example 1 was reproduced with the difference that the water based pressure
sensitive acrylic adhesive was patterned applied on top of the permanent adhesive layer
obtained from applying the solvent based 2-component polyurethane adhesive, over the
entire surface of polyethylene terephthalate film of 23 µm.
After flashing of the solvent, the polyethylene terephthalate film of 23 µm, having the
permanent adhesive over its entire surface, said permanent adhesive, with a layer thickness
of 2.5 µm, being patterned covered by pressure sensitive adhesive with a thickness of 4.4 µm,
was adhesive laminated to a metallized oriented polypropylene film of 35 µm, to create a
duplex structure.
Example 4
Example 3 was repeated wherein the permanent adhesive was a water based
acrylic adhesive (Loctite Liofol LA208 from Henkel) with a layer thickness of 3.2 µm and
wherein the pressure sensitive adhesive was acrylic based (Acronal DS 3609 X from BASF)
with a layer thickness of 5.1 µm, both after flashing-off water.
Example 5
Example 2 was repeated wherein the permanent adhesive was a water based
2-component acrylic adhesive (Loctite Liofol LA208 / LA 5804 from Henkel) at a film
thickness of 3.2 µm after flashing off water.
Example 6 corresponds to the embodiment as shown in Fig. 13.
Example 1 was reproduced with the difference that the water based pressure
sensitive acrylic adhesive was patterned applied on top of the permanent adhesive layer
obtained from applying the solvent based 2-component polyurethane adhesive, over the
substantially entire surface of polyethylene terephthalate film of 23 µm.
After flashing of the solvent, the polyethylene terephthalate film of 23 µm, having the
permanent adhesive over its entire surface, said permanent adhesive, with a layer thickness
of 2.5 µm outside the pattern and 1.5 µm at the pattern, being patterned covered by
pressure sensitive adhesive with a thickness of 3.8 µm, was adhesive laminated to a
metallized oriented polypropylene film of 35 µm, to create a duplex structure.
Quality evaluation
In the following examples the thicknesses have been adapted within the working mode and
the polymer film thicknesses of example 6 to evaluate the quality of the build-in opening and
reclose feature versus the thickness distribution and ratios of the PSA and PA. The films used
for all the examples:
The quality evaluation is based on the peel open strength and adhesive strength after
reclosing the flap. The behaving of reclosing and reopening on the measured areas after the
peel & bond strength for 5 cycles indicates the whether the quality evaluation is:
++ = very good properties for reclosing and reopen
+ = good properties for reclosing and reopen
-/+ neutral properties for reclosing and reopen
- = negative properties for reclosing and reopen
-- = very negative properties for reclosing and reopen
Example Thickness PA Thickness PA Thickness PSA Quality evaluation + remark
outside in pattern in pattern
pattern (µm) (µm) (µm)
7 1 1 3 + (PA<)
8 1 1 5 ++ (PSA>> compensate PA<)
9 6 3 5 ++ (with recess)
3 1 4 ++ (with recess)
11 8 8 1 -(PSA<<)
12 3 2 1.5 - (with recess, PSA<<)
13 1 1 2 -/+
14 2 1 4 ++ (with recess)
1.5 1 1.5 - (with recess, PSA<<)
16 2.5 2 4.5 ++ (with recess)
Laser perforation (ROFIN-BAASEL Lasertech equipment)
The laser perforation of the duplex structure can performed according to
numerous embodiments, dependent on the available laser equipment.
Preferred embodiments are:
- cut inline on both sides of the duplex laminate structure;
- separately cut inline the first and second structure before both structures are adhesive
laminated to a duplex structure;
- cut inline one of both structures before the adhesive lamination of both structures
followed by the adhesive lamination step and then by the cut of the second structure;
- cut inline one of both structures before the adhesive lamination of both structures
followed by the cut off-line of the second structure after lamination;
- cut inline one of both structures after adhesive lamination of both structures followed by
the cut off-line of the second structure;
- cut off-line on both sides of the duplex laminate structure.
[0128] After laser cut of the duplex structure to create the build-in opening and
reclose feature for the reclosable packaging of the present invention, the duplex structure is
cut into the right width and wound on rolls.
Bond/peel strength
[0129] The build-in opening and reclose feature of the duplex structures of example
1 to 5, after laser perforation, shows first opening force values between 1.0 and 1.5N/15mm
according to ASTM F904:98R08 (former DIN 53357), wherein the separation was between the
pressure sensitive adhesive and the metallized oriented polypropylene film for examples 1 to
4 and wherein the separation was between the pressure sensitive adhesive and the
permanent adhesive for example 5.
Claims (16)
1. A reclosable packaging container including a flexible laminate with a build-in opening and reclose feature, said laminate including an inner structure and an outer 5 structure, adhesively joined face-to-face by a permanent adhesive, a pattern of pressure- sensitive adhesive being integrated between said inner and outer structures in the region of the build-in opening and reclose feature, the pressure-sensitive adhesive being entirely covered by the permanent adhesive, the outer structure forming the outer surface of the container and the inner structure forming the inner surface of the container, the outer 10 structure including an outer flap portion delimited by a scoring line through the outer structure, and an inner structure including an inner flap portion delimited by a scoring line through the inner structure, the inner score line and the outer score line creating an opening into the container when the flap portions are peeled back, a marginal region of the outer flap portion extending beyond an edge of the inner flap portion and overlying an underlying 15 surface of the inner structure, the inner and outer flap portions being joined with the permanent adhesive and the pressure-sensitive adhesive being disposed between the marginal region of the outer flap portion and the underlying surface of the inner structure for attaching and re-attaching, in use, the outer flap portion to the underlying surface, the laminate being characterized in that the ratio of the sum of the thicknesses of the superposed 20 permanent adhesive and the pressure sensitive adhesive in the pattern to the thickness of the permanent adhesive outside the pattern is at least 1.3, preferably at least 2.0, more preferably at least 2.5, most preferably at least 3.0.
2. The reclosable packaging container as in claim 1 wherein the thicknesses of the permanent adhesive outside the pattern is between 0.5 and 10 µm, 25 preferably between 1.0 and 7.0 µm, more preferably between 1.5 and 5.0 µm.
3. The reclosable packaging container as in claim 1 or 2 wherein the pattern is characterized in that the thickness of the permanent adhesive is between: - 0.5 and 10 µm when the thickness of the pressure sensitive adhesive is between 2 and 10 30 - preferably between 1.0 and 7.0 µm when the thickness of the pressure sensitive adhesive is between 2.5 and 7.0 µm; - more preferably between 1.5 and 5.0 µm when the thickness of the pressure sensitive adhesive is between 3.0 and 5.0 µm.
4. The reclosable packaging container as in any of previous claims wherein the thickness of the permanent adhesive in the pattern is lower than the thickness of the permanent adhesive outside the pattern, the lower thickness of the permanent adhesive in the pattern forming a recess for the pressure sensitive adhesive.
5 5. The reclosable packaging container as in any of previous claims wherein the ratio of the thickness of the pressure-sensitive adhesive to the thickness of the permanent adhesive in the pattern is ibetween 1 and 9, preferably between 1 and 7, more preferably between 1 and 4.
6. The reclosable packaging container as in any of previous claims 10 wherein the thickness of the permanent adhesive outside the pattern is between 1.5 and 3.5 µm when the thickness of the pressure sensitive adhesive in the pattern is between 2.5 and 6
7. The reclosable packaging container as in any of previous claims, wherein the permanent adhesive (3) includes one or more (co)polymers selected from the 15 group consisting of polyurethane, acrylic, alkylene vinyl alkanate and alkylene allyl alkanate.
8. The reclosable packaging container as in any of previous claims, wherein the pressure sensitive adhesive includes one or more one or more (co)polymers selected from the group consisting of acrylic, alkylene vinyl alkanate and alkylene allyl alkanate acrylic. 20
9. The reclosable packaging container as in any of previous claims, wherein the pressure sensitive adhesive is a water-based adhesive characterized by a solid content between 25 and 80% by weight, preferably between 30 and 75% by weight, more preferably between 35 and 70% by weight.
10. The reclosable packaging container as in any of previous claims, 25 wherein the permanent adhesive (3) includes one or more crosslinking agents selected from the group consisting of non-blocked polyisocyanate, blocked polyisocyanate, C1-C4 alkoxylated amino formaldehyde and carbodiimide.
11. The reclosable packaging container as in any of the previous claims, wherein one of the inner or outer structures of the laminate additionally includes a pattern of 30 release coating in an opening-initiation zone adjacent to the pressure-sensitive adhesive pattern, said release coating being entirely covered by the permanent adhesive.
12. The reclosable packaging container as in any of the previous claims, wherein the inner structure includes a layer of sealable material, said sealable material being a sealable polymer or a sealable coating.
13. The reclosable packaging container as in any of the previous claims, 5 wherein the inner structure and/or the outer structure include(s) a barrier layer.
14. The reclosable packaging container as in any of the previous claims, wherein the flexible laminate with a build-in opening and reclose feature is a lid.
15. A method for making the flexible laminate of the packaging container of Claim 1, said laminate having a built-in opening and reclose feature, said method including 10 the steps of: - pattern-applying a pressure sensitive adhesive onto one surface of the inner or outer structure; - applying a permanent adhesive onto at least 85% of the entire surface of the inner or outer structure, the permanent adhesive entirely covering the pressure sensitive adhesive 15 before or after adhesively joining the inner structure to the outer structure; - scoring the inner and outer structures by a scoring station before or after adhesively joining the inner structure to the outer structure face to face via the permanent adhesive to form the laminate, an outer score line being formed through the thickness of the outer structure in registration with the outer perimeter of the pressure sensitive adhesive, and 20 an inner score line being formed through the thickness of the inner structure in registration with the inner perimeter of the pressure sensitive adhesive, the marginal region of the outer opening portion between the outer and inner score lines being attached to an underlying surface of the inner structure via the pressure sensitive adhesive. 25
16. The method according to claim 15 wherein the layer of permanent adhesive is applied with recesses in the pattern region, the pressure sensitive adhesive being pattern applied in a separate step on said recesses. fig. 1 fig. 2 fig. 3 fig. 4 fig. 5 fig. 6
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16151346.0 | 2016-01-14 | ||
EP16151346.0A EP3159280B1 (en) | 2016-01-14 | 2016-01-14 | Reclosable packaging and method for producing the same |
PCT/EP2016/081971 WO2017068203A1 (en) | 2016-01-14 | 2016-12-20 | Reclosable packaging |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ733925A NZ733925A (en) | 2019-02-22 |
NZ733925B true NZ733925B (en) | 2019-05-23 |
Family
ID=
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