JPH07125166A - Laminated polyester film for coating inner can of three-piece can - Google Patents
Laminated polyester film for coating inner can of three-piece canInfo
- Publication number
- JPH07125166A JPH07125166A JP5298971A JP29897193A JPH07125166A JP H07125166 A JPH07125166 A JP H07125166A JP 5298971 A JP5298971 A JP 5298971A JP 29897193 A JP29897193 A JP 29897193A JP H07125166 A JPH07125166 A JP H07125166A
- Authority
- JP
- Japan
- Prior art keywords
- polyester
- piece
- film
- coated
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 21
- 229920006267 polyester film Polymers 0.000 title claims abstract description 15
- 229920000728 polyester Polymers 0.000 claims abstract description 104
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 13
- 238000011282 treatment Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 15
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- -1 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 16
- 239000010410 layer Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 30
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 238000010030 laminating Methods 0.000 description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- WOZVHXUHUFLZGK-UHFFFAOYSA-N dimethyl terephthalate Chemical compound COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- 229910052724 xenon Inorganic materials 0.000 description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000009998 heat setting Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000007334 copolymerization reaction Methods 0.000 description 3
- VNGOYPQMJFJDLV-UHFFFAOYSA-N dimethyl benzene-1,3-dicarboxylate Chemical compound COC(=O)C1=CC=CC(C(=O)OC)=C1 VNGOYPQMJFJDLV-UHFFFAOYSA-N 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 3
- 238000006068 polycondensation reaction Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 238000005979 thermal decomposition reaction Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000005029 tin-free steel Substances 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- 238000005809 transesterification reaction Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 101100160821 Bacillus subtilis (strain 168) yxdJ gene Proteins 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- XQKKWWCELHKGKB-UHFFFAOYSA-L calcium acetate monohydrate Chemical compound O.[Ca+2].CC([O-])=O.CC([O-])=O XQKKWWCELHKGKB-UHFFFAOYSA-L 0.000 description 1
- 229940067460 calcium acetate monohydrate Drugs 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- AAEHPKIXIIACPQ-UHFFFAOYSA-L calcium;terephthalate Chemical compound [Ca+2].[O-]C(=O)C1=CC=C(C([O-])=O)C=C1 AAEHPKIXIIACPQ-UHFFFAOYSA-L 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011261 inert gas Substances 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
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、３ピース缶の内缶被覆
用積層ポリエステルフイルムに関するものであり、詳し
くは、金属とのラミネート性に優れると共にレトルト処
理での抽出量が少ない、３ピース缶の内缶被覆用積層ポ
リエステルフイルムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated polyester film for coating an inner can of a three-piece can, and more specifically, a three-piece can having excellent laminating properties with a metal and a small extraction amount in retort treatment. The present invention relates to a laminated polyester film for coating an inner can.
【０００２】[0002]
【従来の技術】近年、金属缶用材料として、熱可塑性樹
脂フイルム被覆金属板の利用が検討されている。その理
由は、金属板に熱硬化性樹脂塗料を塗装した後、焼き付
けて硬化させた従来の塗装板では、塗装量の増加やダブ
ルコート等によってもピンホール等による金属露出を完
全になくすことが困難であるのに対し、熱可塑性樹脂フ
イルム被覆金属板の場合には、ほぼ完全に金属露出をな
くすことが出来ると言う利点があるからである。また、
塗装板の場合は、塗装および焼き付け工程で大量の溶剤
を用いるのに対し、熱可塑性樹脂フイルム被覆金属板の
場合は、フイルムを熱ラミネートするだけであるため溶
剤を必要としないと言う利点があるからである。2. Description of the Related Art Recently, the use of a thermoplastic resin film-coated metal sheet as a material for a metal can has been studied. The reason for this is that with a conventional coated plate that was baked and cured after coating a thermosetting resin coating on a metal plate, it is possible to completely eliminate metal exposure due to pinholes etc. even by increasing the coating amount and double coating etc. This is because it is difficult, but in the case of a thermoplastic resin film-coated metal plate, there is an advantage that the metal exposure can be almost completely eliminated. Also,
In the case of a coated plate, a large amount of solvent is used in the painting and baking steps, whereas in the case of a thermoplastic resin film-coated metal plate, there is an advantage that the solvent is not required because the film is only heat laminated. Because.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来提
案されている缶の内、タルク缶と呼ばれる絞りだけが施
される缶においては、依然として、缶成形の際にクラッ
クが入り易く、また、フイルムの配向が低いために強度
が劣り、しかも、缶内容物を高温処理した際にオリゴマ
ー等の低分子量物が抽出されると言う問題がある。However, among the conventionally proposed cans, the cans which are called talc cans, which are only drawn, are still liable to be cracked during the can forming, and the cans Since the orientation is low, there is a problem that the strength is inferior and a low molecular weight substance such as an oligomer is extracted when the can contents are subjected to high temperature treatment.
【０００４】一方、代表的な缶である３ピース缶は、溶
接によって作った胴缶および底缶と必要に応じてスコア
ーを付けた缶蓋とから構成される缶であるが、未だ、熱
可塑性樹脂フイルム被覆金属板を用いた３ピース缶は提
案されていない。従って、タルク缶の場合と異なり、３
ピース缶の内缶被覆用積層ポリエステルフイルムについ
ては、その必要特性などは未だ明らかでない。本発明
は、上記実情に鑑みなされたものであり、その目的は、
３ピース缶の内缶被覆用積層ポリエステルフイルムを提
供することにある。On the other hand, a three-piece can, which is a typical can, is a can composed of a body can and a bottom can made by welding and a can lid with a score if necessary, but it is still thermoplastic. A three-piece can using a resin film-coated metal plate has not been proposed. Therefore, unlike the case of talc can, 3
Regarding the laminated polyester film for coating the inner can of a piece can, the necessary characteristics have not been clarified yet. The present invention has been made in view of the above circumstances, and its purpose is to:
It is intended to provide a laminated polyester film for coating an inner can of a three-piece can.
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明の要旨
は、３ピース缶の内缶被覆用積層ポリエステルフイルム
であって、内容物に接する側に位置するポリエステル層
（Ａ）は、融点が２３０〜２８０℃のポリエステル
（ａ）で構成され、金属に被覆される側に位置するポリ
エステル層（Ｂ）は、融点が１７０〜２８０℃で且つポ
リエステル（ａ）のそれより少なくとも５℃低いポリエ
ステル（ｂ）で構成され、しかも、金属に被覆され且つ
製缶後の測定において、純水１２５℃１時間のレトルト
処理した際に抽出されるポリエステル（ａ）の低分子量
物は、被覆表面１ｃｍ2 当たり２．０μｇ以下であり、
ポリエステル（ａ）の末端カルボキシル基濃度は、５０
当量／ｔ未満であることを特徴とする３ピース缶の内缶
被覆用積層ポリエステルフイルムに存する。That is, the gist of the present invention is a laminated polyester film for coating an inner can of a three-piece can, wherein the polyester layer (A) located on the side in contact with the contents has a melting point of 230. The polyester layer (B) composed of the polyester (a) having a temperature of 280 ° C. to 280 ° C. and located on the side coated with a metal has a melting point of 170 to 280 ° C. and is at least 5 ° C. lower than that of the polyester (a) (b). In addition, the low molecular weight polyester (a), which is coated with a metal and is extracted after a retort treatment of pure water at 125 ° C. for 1 hour, is 2 per 1 cm 2 of the coated surface in the measurement after can making. 0.0 μg or less,
The terminal carboxyl group concentration of the polyester (a) is 50
The present invention relates to a laminated polyester film for coating an inner can of a three-piece can, which is characterized in that it is less than the equivalent weight / t.
【０００６】以下、本発明を詳細に説明する。本発明の
積層フイルムにおいて、ポリエステル層（Ａ）は内容物
に接する側に、ポリエステル層（Ｂ）は金属に被覆され
る側に位置させられる。これらのポリエステル層を構成
するポリエステルは、ジカルボン酸成分とジオール成分
から得られる。The present invention will be described in detail below. In the laminated film of the present invention, the polyester layer (A) is located on the side in contact with the contents, and the polyester layer (B) is located on the side coated with the metal. The polyester constituting these polyester layers is obtained from a dicarboxylic acid component and a diol component.
【０００７】ジカルボン酸成分としては、テレフタル
酸、シュウ酸、マロン酸、コハク酸、アジピン酸、アゼ
ライン酸、セバシン酸、フタル酸、イソフタル酸、ナフ
タレンジカルボン酸、ジフュニルエーテルジカルボン酸
などの一種または二種以上が挙げられる。ジオール成分
としては、エチレングリコール、プロピレングリコー
ル、トリメチレングリコール、テトラメチレングリコー
ル、ヘキサメチレングリコール、ジェチレングリコー
ル、ポリアルキレングリコール、１．４−シクロヘキサ
ンジメタノール、ネオペンチルグリコール等の一種また
は二種以上が挙げられる。As the dicarboxylic acid component, one of terephthalic acid, oxalic acid, malonic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyl ether dicarboxylic acid, etc. There are two or more types. The diol component may be one or more of ethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, propylene glycol, polyalkylene glycol, 1.4-cyclohexanedimethanol, neopentyl glycol and the like. Can be mentioned.
【０００８】ポリエステル層（Ａ）は、融点が２３０〜
２８０℃、好ましくは２３０〜２６０℃のポリエステル
（ａ）で構成されるのに対し、ポリエステル層（Ｂ）
は、金属とのラミネート性を高めるため、融点が１７０
〜２８０℃、好ましくは１７０〜２３０℃で且つポリエ
ステル（ａ）のそれより少なくとも５℃低いポリエステ
ル（ｂ）で構成される。The polyester layer (A) has a melting point of 230-
The polyester layer (B) is composed of the polyester (a) at 280 ° C., preferably 230 to 260 ° C.
Has a melting point of 170 in order to improve the laminating property with metal.
Comprised of polyester (b) at ˜280 ° C., preferably 170-230 ° C. and at least 5 ° C. lower than that of polyester (a).
【０００９】代表的なポリエステル（ａ）としては、ポ
リエチレンテレフタレート（ＰＥＴ）とその共重合体、
ポリエチレン−２，６−ナフタレンジカルボキシレート
（ＰＦＨ）とその共重合体、ポリシクロヘキサンジメチ
レンテレフタレートとその共重合体（ＰＣＴ等）等が例
示されるが、コスト−パフォーマンスの点から、ＰＥＴ
を９５モル％以上含有するポリエステルが好ましい。A typical polyester (a) is polyethylene terephthalate (PET) and its copolymer,
Examples thereof include polyethylene-2,6-naphthalenedicarboxylate (PFH) and its copolymer, polycyclohexanedimethylene terephthalate and its copolymer (PCT, etc.), etc., but from the viewpoint of cost-performance, PET
Is preferably a polyester containing 95 mol% or more.
【００１０】ポリエステル（ｂ）としては、好ましくは
共重合ポリエステルが用いられ、更に好ましくは、ポリ
エチレンテレフタレートとの共重合ポリエステルが用い
られる。ポリエチレンテレフタレートに対する共重合量
は、ジカルボン酸中の共重合量をＸモル％とし、ジオー
ル中の共重合量をＹモル％とした際、その合計モル％Ｗ
（Ｘ＋Ｙ）が１０〜４０であることが好ましい。As the polyester (b), a copolymerized polyester is preferably used, and a copolymerized polyester with polyethylene terephthalate is more preferably used. When the copolymerization amount in dicarboxylic acid is X mol% and the copolymerization amount in diol is Y mol%, the total amount of copolymerization with respect to polyethylene terephthalate is mol% W
(X + Y) is preferably 10 to 40.
【００１１】本発明の積層フイルムにおいて、ポリエス
テル層（Ａ）を構成するポリエステル（ａ）の純水１２
５℃１時間のレトルト処理した際に抽出される低分子量
物は、金属に被覆され且つ製缶後の測定において、被覆
表面１ｃｍ2 当たり、２．０μｇ以下、好ましくは１．
５μｇ以下、更に好ましくは１．０μｇ以下であること
が重要である。上記の条件で抽出される低分子量物が被
覆表面１ｃｍ2 当たり２．０μｇを超える場合は、殺菌
などの目的で加熱された際に充填された内容物の風味が
損われる恐れがある。In the laminated film of the present invention, pure water of polyester (a) constituting the polyester layer (A) 12
Low molecular weight substance to be extracted when 5 was retorting ° C. 1 hour, in the measurement after and coated on the metal canning, coated surfaces 1 cm 2 per, 2.0 [mu] g or less, preferably 1.
It is important that the amount is 5 μg or less, more preferably 1.0 μg or less. When the amount of the low molecular weight substance extracted under the above conditions exceeds 2.0 μg per cm 2 of the coated surface, the flavor of the filled contents may be impaired when heated for the purpose of sterilization or the like.
【００１２】更に、本発明の積層フイルムにおいて、ポ
リエステル層（Ａ）を構成するポリエステル（ａ）の末
端カルボキシル基濃度は、金属に被覆され且つ製缶後の
測定において、５０当量／ｔ（トン）未満、好ましくは
４０当量／ｔ未満、更に好ましくは３０当量／ｔ未満で
あることが重要である。末端カルボキシル基濃度が５０
当量／ｔを超える場合は、熱分解の開始点となる末端カ
ルボキシル基が多いため、製缶後の加熱処理によって新
たに低分子量物が生成する。Further, in the laminated film of the present invention, the terminal carboxyl group concentration of the polyester (a) constituting the polyester layer (A) is 50 equivalents / t (ton) after being coated with a metal and measured after can making. It is important that it is less than, preferably less than 40 equivalents / t, more preferably less than 30 equivalents / t. Terminal carboxyl group concentration is 50
When it exceeds the equivalent weight / t, there are many terminal carboxyl groups that are the starting points of thermal decomposition, so that a new low molecular weight product is newly produced by the heat treatment after can making.
【００１３】末端カルボキシル基濃度の低いポリエステ
ルは、重縮合における反応条件（触媒量、反応温度、滞
留時間など）を適宜選択して熱分解を抑制することによ
り製造することが出来る。また、ポリエステル中の低分
子量物を低減させる方法としては、熱分解の抑制された
低い温度で重合度を高めるために溶液重合に続いて固相
重合を採用する方法、ポリエステル中の低分子量物を流
体で溶解除去する方法などが挙げられる。また、上記の
低分子量物の溶解除去方法をフイルムに適用することに
より、低分子量物を低減させることも出来る。これらの
方法は、単独で行っても又は適宜組み合わせて行っても
よい。A polyester having a low terminal carboxyl group concentration can be produced by appropriately selecting reaction conditions (catalyst amount, reaction temperature, residence time, etc.) in polycondensation to suppress thermal decomposition. Further, as a method of reducing the low molecular weight substance in the polyester, a method of adopting solid phase polymerization subsequent to solution polymerization in order to increase the degree of polymerization at a low temperature where thermal decomposition is suppressed, a low molecular weight substance in the polyester Examples include a method of dissolving and removing with a fluid. Further, the low molecular weight substance can be reduced by applying the above-mentioned method of dissolving and removing the low molecular weight substance to the film. These methods may be performed alone or in appropriate combination.
【００１４】上記の固相重合は、ポリエステルの極限粘
度［ｎ］が０．４０〜０．５５の範囲で重縮合を停止し
た後、約０．３ｍｎＨｇの高真空下、２００〜２５０℃
で３〜２４時間加熱することによって行うのが好まし
い。In the above solid phase polymerization, after stopping the polycondensation when the intrinsic viscosity [n] of the polyester is in the range of 0.40 to 0.55, it is 200 to 250 ° C. under a high vacuum of about 0.3 mnHg.
It is preferable to carry out heating for 3 to 24 hours.
【００１５】上記の低分子量物の溶解除去方法は、水、
水蒸気、水蒸気含有不活性ガス、水蒸気含有空気などに
ポリエステルチップを接触させることにより行なわれ
る。水とポリエステルチップとを接触させる場合は、通
常２５〜１５０℃で１分から１００時間、好ましくは５
０〜１５０℃で１分から１０時間、更に好ましくは８０
〜１００℃で５分から３時間接触させる。The above-mentioned method for dissolving and removing low molecular weight substances is carried out by using water,
It is carried out by bringing the polyester chips into contact with steam, steam-containing inert gas, steam-containing air or the like. When the water and the polyester chips are brought into contact with each other, it is usually at 25 to 150 ° C. for 1 minute to 100 hours, preferably 5
0 to 150 ° C., 1 minute to 10 hours, more preferably 80
Contact at -100 ° C for 5 minutes to 3 hours.
【００１６】水蒸気、水蒸気含有ガス又は水蒸気含有空
気とポリエステルチップとを接触させる場合は、通常２
５〜１５０℃、好ましくは７０〜１１０℃の温度におい
て、ポリエステル１ｋｇ当り０．５ｇ以上の量の水蒸気
などとポリエステルチップとを接触させる。接触時間
は、通常は１分から５０時間、好ましくは５分から１０
時間である。低分子量物の溶解除去方法をフイルムに適
用する場合の条件は、上記と同様である。この場合、キ
シレンやクロロホルムの様な有機溶媒を用いることも出
来る。When the polyester chips are contacted with water vapor, water vapor containing gas or water vapor containing air, it is usually 2
At a temperature of 5 to 150 ° C., preferably 70 to 110 ° C., the amount of water vapor of 0.5 g or more per kg of polyester is brought into contact with the polyester chips. The contact time is usually 1 minute to 50 hours, preferably 5 minutes to 10
It's time. The conditions for applying the method for dissolving and removing low molecular weight substances to a film are the same as above. In this case, an organic solvent such as xylene or chloroform can be used.
【００１７】本発明の積層フイルムは、ポリエステル層
（Ａ）と（Ｂ）を含む多層構造の二軸延伸積層フイルム
から成る。多層構造は、Ａ／Ｂの２層構造の他、層
（Ａ）、（Ｂ）の間に単層または多層の層（Ｃ）を含む
Ａ／Ｃ／Ｂの多層構造を採用することが出来る。The laminated film of the present invention comprises a biaxially stretched laminated film having a multilayer structure containing polyester layers (A) and (B). As the multilayer structure, in addition to the A / B two-layer structure, an A / C / B multilayer structure including a single layer or a multilayer layer (C) between the layers (A) and (B) can be adopted. .
【００１８】本発明の積層フイルムにおいて、ポリエス
テル層（Ｂ）は、厚さが１．０μｍ以上であり、特に、
金属との接着性を向上させるためには２．０μｍ以上が
好ましい。一方、ポリエステル層（Ａ）は、金属缶形成
後において、積層フイルムからの低分子量物の溶出を十
分に防止し得る限り薄くてもよいが、好ましくは１．０
μｍ以上である。積層フイルムの全体厚さは、通常３〜
１００μｍ、好ましくは５〜５０μｍ、更に好ましくは
１０〜３０μｍである。そして、ポリエステル層（Ｂ）
が実質的に非晶質のポリエステルにて構成される場合
は、ポリエステル層（Ｂ）の厚さは、積層フイルムの全
体厚さの５０％未満、好ましくは３０％未満とするのが
好ましい。In the laminated film of the present invention, the polyester layer (B) has a thickness of 1.0 μm or more, and particularly,
In order to improve the adhesiveness with metal, it is preferably 2.0 μm or more. On the other hand, the polyester layer (A) may be thin as long as it can sufficiently prevent the elution of low molecular weight substances from the laminated film after the metal can is formed, but it is preferably 1.0.
It is at least μm. The total thickness of the laminated film is usually 3 to
The thickness is 100 μm, preferably 5 to 50 μm, more preferably 10 to 30 μm. And the polyester layer (B)
When is composed of substantially amorphous polyester, the thickness of the polyester layer (B) is preferably less than 50%, preferably less than 30% of the total thickness of the laminated film.
【００１９】本発明の積層フイルムは、無機または有機
の微粒子を含有することにより、易滑性を有しているこ
とが好ましい。微粒子としては、カオリン、クレー、炭
酸カルシウム（バテライト型、カルサイト型など）、酸
化ケイ素、球状シリカ、テレフタル酸カルシウム、酸化
アルミニウム（α、δ、γ、θ型など）、酸化チタン、
リン酸カルシウム、フッ化リチウム、カーボンブラック
等の公知の不活性外部粒子、ポリエステル樹脂の溶融製
膜に際して不溶な高融点有機化合物、架橋ポリマー（粉
砕型および単分散型）が挙げられる。その他、ポリエス
テル合成時に用いる金属化合物触媒、例えば、アルカリ
金属化合物、アルカリ土類金属化合物などによってポリ
エステル製造時にポリマー内部に形成される内部粒子を
挙げることも出来る。The laminated film of the present invention preferably contains an inorganic or organic fine particle so as to have slipperiness. The fine particles include kaolin, clay, calcium carbonate (vaterite type, calcite type, etc.), silicon oxide, spherical silica, calcium terephthalate, aluminum oxide (α, δ, γ, θ type, etc.), titanium oxide,
Known inert external particles such as calcium phosphate, lithium fluoride, carbon black, etc., high-melting point organic compounds insoluble during melt film formation of polyester resin, and crosslinked polymers (pulverized type and monodispersed type) can be mentioned. In addition, internal particles formed inside the polymer at the time of polyester production by a metal compound catalyst used at the time of polyester synthesis, for example, an alkali metal compound, an alkaline earth metal compound and the like can be mentioned.
【００２０】微粒子の粒径は、通常０．０１〜３０μ
ｍ、好ましくは、０．０５〜１５μｍであり、配合量
は、通常０．００１〜１０重量％、好ましくは０．０１
〜５重量％である。そして、上記の微粒子は、表層を構
成するポリエステル層に含有させるのが好ましい。な
お、表層以外の層を構成するポリエステル層には、再生
レジン、インラインコート塗布剤含有レジン等を含有さ
せることも出来る。また、必要に応じて、有機滑剤、安
定剤、着色剤、酸化防止剤、消泡剤、静電防止剤などの
添加剤を含有させることも出来る。The particle size of the fine particles is usually 0.01 to 30 μm.
m, preferably 0.05 to 15 μm, and the compounding amount is usually 0.001 to 10% by weight, preferably 0.01.
~ 5% by weight. The fine particles are preferably contained in the polyester layer forming the surface layer. The polyester layer constituting the layers other than the surface layer may contain a recycled resin, a resin containing an in-line coating agent, and the like. Further, if necessary, additives such as an organic lubricant, a stabilizer, a colorant, an antioxidant, an antifoaming agent and an antistatic agent can be contained.
【００２１】本発明の積層フイルムの１００℃で３０分
処理後における熱収縮率は、好ましくは２．０％以下、
更に好ましくは１．５％以下、最も好ましくは１．０％
以下である。一般的に言えば、共重合ポリエステルフイ
ルムの熱収縮率は、ＰＥＴフィルのそれよりも大きい
が、本発明の積層フイルムは、ポリエステル層（Ａ）を
構成するポリエステルとして実質的に非晶質のポリエス
テルを用いることにより、上記の様に収縮率を低くする
ことが出来る。The heat shrinkage of the laminated film of the present invention after treatment at 100 ° C. for 30 minutes is preferably 2.0% or less,
More preferably 1.5% or less, most preferably 1.0%
It is the following. Generally speaking, the heat shrinkage rate of the copolyester film is larger than that of the PET fill, but the laminated film of the present invention has a substantially amorphous polyester as the polyester constituting the polyester layer (A). By using, it is possible to reduce the shrinkage rate as described above.
【００２２】次に、本発明の積層フイルムの製造方法お
よびそれを被覆した３ピース缶の製造方法の一例につい
て説明する。本願発明の積層フイルムを得る方法として
は、共押出法（コエクストルージョン法）、ドライラミ
ネート法、押出ラミネート法などの公知の手法が用いら
れるが、特に、共押出法が好ましい。従って、積層フイ
ルムを得る方法としては、共押出法について説明する。Next, an example of a method for producing the laminated film of the present invention and a method for producing a three-piece can coated with the laminated film will be described. As a method for obtaining the laminated film of the present invention, known methods such as a coextrusion method (coextrusion method), a dry laminating method and an extrusion laminating method are used, and the coextrusion method is particularly preferable. Therefore, a coextrusion method will be described as a method for obtaining a laminated film.
【００２３】ポリエステル層（Ａ）、（Ｂ）等を構成す
る原料ポリエステルチップを乾燥した後、別々の押出機
を用いて２００〜３２０℃の温度で溶融させ、パイプ内
または口金内で合流させて多層に押出した後、キャステ
ィングドラム上に急冷して、未延伸積層シートを得る。
ポリエステルチップの乾燥には、ホッパードライヤー、
パドルドライヤー、真空乾燥機などを用いることが出来
る。押し出しに際しては、Ｔダイ法が好適である。押し
出しの際、各々の押出機のギヤポンプによる吐出量を調
整することにより、積層フイルムの各層の厚さ比を適宜
変更することが出来る。また、キャスティングに際して
は、いわゆる静電密着法を用いることにより、厚さむら
の少ない積層シートを得ることが出来る。After drying the raw material polyester chips constituting the polyester layers (A), (B), etc., they are melted at a temperature of 200 to 320 ° C. by using separate extruders and merged in a pipe or a die. After extruding into multiple layers, it is rapidly cooled on a casting drum to obtain an unstretched laminated sheet.
For drying polyester chips, use a hopper dryer,
A paddle dryer, a vacuum dryer, etc. can be used. The T-die method is suitable for extrusion. At the time of extrusion, the thickness ratio of each layer of the laminated film can be appropriately changed by adjusting the discharge amount by the gear pump of each extruder. In addition, when casting is performed, a so-called electrostatic contact method is used to obtain a laminated sheet with less uneven thickness.
【００２４】得られた未延伸積層シートは、引き続く延
伸工程において、Ｔｇmin −１０℃以上Ｔｃmax −１０
℃以下の温度範囲で縦横共に２．０倍以上延伸される。
ここに、Ｔｇmin は、原料ポリエステルのＴｇの最小
値、Ｔｃmax は、原料ポリエステルのＴｃの最大値を表
す。The resulting unstretched laminated sheet has a Tg min of -10 ° C. or higher and a Tc max of -10 in the subsequent stretching step.
It is stretched 2.0 times or more in both length and width in the temperature range of ℃ or less.
Here, Tg min represents the minimum value of Tg of the raw material polyester, and Tc max represents the maximum value of Tc of the raw material polyester.
【００２５】二軸延伸積層フイルムは、引き続く熱固定
工程において、１８０℃〜２４０℃の温度で熱固定され
る。熱固定は、一般的には緊張固定下で実施されるが、
熱固定時および／または熱固定後の冷却時にフイルムの
長手方向および／または幅方向に２０％以下弛緩を行っ
たり、または、巾出しを行なうことも出来る。The biaxially stretched laminated film is heat set at a temperature of 180 ° C. to 240 ° C. in the subsequent heat setting process. Heat fixation is generally performed under tension fixation,
At the time of heat setting and / or at the time of cooling after heat setting, the film may be relaxed by 20% or less in the longitudinal direction and / or the width direction, or may be drawn out.
【００２６】本発明の積層フイルムにおいて、内容物に
接する側に位置するポリエステル層（Ａ）は、面配向Δ
Ｐが０．１００〜０．２００、結晶化度Ｘｃが３０〜７
０％であることが好ましい。特に好ましい面配向ΔＰは
０．１３０〜０．１８０であり、特に好ましい結晶化度
Ｘｃは３５〜５５％である。ΔＰが０．１００未満の場
合やＸC が３０％未満の場合は、ガスバリヤー性が十分
ではなく、また、ΔＰが０．２００を超える場合やＸc
が７０％を超える場合は、フイルムが脆くなり、何れの
場合も好ましくない。In the laminated film of the present invention, the polyester layer (A) located on the side in contact with the contents has a plane orientation Δ.
P is 0.100 to 0.200 and crystallinity Xc is 30 to 7.
It is preferably 0%. Particularly preferable plane orientation ΔP is 0.130 to 0.180, and particularly preferable crystallinity Xc is 35 to 55%. When ΔP is less than 0.100 or when X C is less than 30%, the gas barrier property is insufficient, and when ΔP exceeds 0.200 or X c
When it exceeds 70%, the film becomes brittle, which is not preferable in any case.
【００２７】上記の延伸工程中または延伸前もしくは延
伸後、積層フイルムの片面または両面にコロナ放電処
理、薬液処理、火炎処理などの各種表面処理を施し、積
層フイルムの接着性などを向上させることも出来る。上
記の延伸工程中または延伸前もしくは延伸後、積層フイ
ルムの片面または両面に塗布を行ない、積層フイルムの
接着性、帯電防止性、易滑性などを向上させることも可
能である。During or after the above-described stretching step, one or both surfaces of the laminated film may be subjected to various surface treatments such as corona discharge treatment, chemical treatment and flame treatment to improve the adhesiveness of the laminated film. I can. It is also possible to improve the adhesiveness, antistatic property, slipperiness and the like of the laminated film by applying to one side or both sides of the laminated film during the stretching step or before or after the stretching.
【００２８】上記の様にして得られた積層フイルムは、
巻き取られて３ピース缶の内缶被覆用フイルムとして用
いられる。すなわち、融点が２３０〜２８０℃であり、
末端カルボキシル基濃度および低分子量物の低減された
ポリエステル（ａ）で構成されるポリエステル層（Ａ）
が内容物に接する側に位置させ、融点が１７０〜２８０
℃で且つポリエステル（ａ）のそれより少なくとも５℃
低いポリエステル（ｂ）で構成されるポリエステル層
（Ｂ）が金属に被覆されて用いられる。The laminated film obtained as described above is
It is wound up and used as a film for coating an inner can of a three-piece can. That is, the melting point is 230 to 280 ° C.,
Polyester layer (A) composed of polyester (a) with reduced terminal carboxyl group concentration and low molecular weight
Is located on the side in contact with the contents and has a melting point of 170 to 280.
℃ and at least 5 ℃ than that of polyester (a)
A polyester layer (B) composed of a low polyester (b) is used as coated with a metal.
【００２９】３ピース缶に用いられる金属板としては、
表面処理鋼板、アルミニウム等の軽金属板が挙げられ
る。表面処理鋼板としては、一般的なクロム処理により
不動態化した錫で被覆した鋼板、ニッケルメッキ鋼板、
亜鉛メッキ鋼板などが挙げられるが、特に、クロム金属
と酸化クロムの２層を有する電解クロム被覆鋼板が好適
である。また、アルミニウムの場合、純アルミニウムで
もよいが、マンガン、マグネシウム、亜鉛、銅などが若
干量含有される合金であってもよい。また、純アルミニ
ウム、アルミニウム合金の何れの場合もクロム酸処理ま
たはクロム酸／燐酸処理が行われていてもよい。As the metal plate used for the three-piece can,
Examples include surface-treated steel plates and light metal plates such as aluminum. As the surface-treated steel sheet, a steel sheet coated with tin that has been passivated by general chrome treatment, a nickel-plated steel sheet,
Examples of the galvanized steel sheet include an electrolytic chromium-coated steel sheet having two layers of chromium metal and chromium oxide. In the case of aluminum, pure aluminum may be used, but an alloy containing a small amount of manganese, magnesium, zinc, copper, or the like may be used. Further, in both cases of pure aluminum and aluminum alloy, chromic acid treatment or chromic acid / phosphoric acid treatment may be performed.
【００３０】３ピース缶は、缶胴の接合方法の相違によ
り、はんだ缶、接着缶、溶接缶に大別されるが、本発明
の積層フイルムは、特に、接着缶、溶接缶に対して好適
に用いられる。接着缶は、一般缶として古くから用いら
れており、はぜ折りした部分に溶融した接着剤を注入す
る方法で製造される。溶接缶の製法としてはコノウェル
ド法、スードロニックウェルド法が挙げられる。前者は
ＴＦＳ（Ｔｉｎ Ｆｒｅｅ Ｓｔｅｅｌ）表面のクロム
皮膜を剥離し、ロール電極によって鋼母材を溶接する方
法である。後者はブリキを対象とした製法であり、ブラ
ンクの溶接端面を研磨せず、胴ワイヤーをロール電極と
ブリキの間の中間電極として用いて溶接する方法であ
る。Three-piece cans are roughly classified into solder cans, adhesive cans, and welded cans depending on the method of joining can bodies. The laminated film of the present invention is particularly suitable for adhesive cans and welded cans. Used for. The adhesive can has been used as a general can for a long time, and is manufactured by a method of injecting a molten adhesive into a folded portion. Examples of the manufacturing method of the welding can include the cono weld method and the sudronic weld method. The former is a method in which the chromium coating on the surface of TFS (Tin Free Steel) is peeled off and the steel base material is welded by a roll electrode. The latter is a manufacturing method for tinplate, and is a method for welding by using a body wire as an intermediate electrode between the roll electrode and the tinplate without polishing the welding end surface of the blank.
【００３１】ポリエステル被覆鋼板は、各種接着剤、例
えば、エポキシ樹脂接着剤を用いてクロム表面処理鋼板
や錫メッキ鋼板あるいはアルミニウム板の両面に積層フ
イルムを加圧接着して得られる。この際、缶胴とするた
めの鋼板には事前に各種の印刷を施した本発明の積層フ
イルムを被覆してもよい。クロム表面処理鋼板、錫メッ
キ鋼板は、缶胴、缶底の原材料として、アルミニウム板
は、缶蓋の原材料として用いられる。いずれの場合も適
当な形に切り抜き３ピース缶の構成部品として用いる。The polyester-coated steel sheet can be obtained by pressure-bonding the laminated film on both surfaces of a chromium surface-treated steel sheet, a tin-plated steel sheet or an aluminum sheet using various adhesives such as epoxy resin adhesive. At this time, the steel sheet for forming the can body may be coated with the laminated film of the present invention, which has been subjected to various kinds of printing in advance. Chromium surface-treated steel sheets and tin-plated steel sheets are used as raw materials for can bodies and bottoms, and aluminum plates are used as raw materials for can lids. In each case, it is cut into a suitable shape and used as a component of a three-piece can.
【００３２】先ず、缶胴用被覆鋼板を筒状に丸め、上記
の接合方法によって缶胴とする。次いで、上記の缶胴に
缶底用被覆鋼板を取り付ける。この際、缶胴の巻き込み
縁部に密封材料としてゴム系のシーリングコンパウンド
を塗布乾燥して缶底を二重に巻き締める。通常はこの様
にして得られた成形体にジュース等の内容物を充填した
後に缶底の場合と同様にして缶蓋用被覆アルミニウム板
を巻き締め３ピース缶とする。First, the coated steel sheet for a can body is rolled into a tubular shape, and the can body is made by the above-mentioned joining method. Next, the can bottom coated steel plate is attached to the can body. At this time, a rubber-based sealing compound is applied as a sealing material to the winding edge of the can body and dried to double-tighten the bottom of the can. Usually, the molded body thus obtained is filled with the contents such as juice and then the coated aluminum plate for the can lid is wound to form a three-piece can in the same manner as in the case of the can bottom.
【００３３】特に、両面被覆の３ピース缶は、フイルム
表面に印刷すればよいため、印刷の柄が突然変更になっ
ても、フイルム表面の印刷を変更するだけで対応し得
る。従って、両面被覆の３ピース缶は、従来の３ピース
缶に比べて在庫管理が容易であり、コストダウンに寄与
し得る点で好ましい。In particular, since the double-side coated three-piece can can be printed on the film surface, even if the print pattern is suddenly changed, it can be dealt with only by changing the printing on the film surface. Therefore, the double-sided coated three-piece can is preferable in that inventory management is easier than that of the conventional three-piece can and it can contribute to cost reduction.
【００３４】[0034]
【実施例】以下、本発明を実施例を挙げて更に詳細に説
明するが、本発明は、その要旨を超えない限り、以下の
実施例に限定されるものではない。なお、評価方法およ
び原料ポリエステルの製造方法は以下の通りである。ま
た、「部」とあるのは「重量部」を示す。The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist. The evaluation method and the method for producing the raw material polyester are as follows. Moreover, "part" means "part by weight".
【００３５】（１）極限粘度［η］：ポリマー１ｇをフ
ェノール／テトラクロロエタン＝５０／５０（重量比）
の混合溶媒１００ｍｌ中に溶解し３０℃で測定する。(1) Intrinsic viscosity [η]: 1 g of polymer is phenol / tetrachloroethane = 50/50 (weight ratio)
Dissolve in 100 ml of mixed solvent of and measure at 30 ° C.
【００３６】（２）低分子量物抽出量（μｇ／ｃ
ｍ2 ）：試料フイルムをエポキシ樹脂接着剤を用いてク
ロムメッキ処理を施した厚み０．３０ｍｍの鋼板に低温
にて加圧接着してポリエステル被覆鋼板を得る。ただ
し、鋼板の片面のみに樹脂を被覆する。そして、ポリエ
ステルが被覆されている面を内側として、特開平５−６
９４８５に開示されている方法により、溶接接合された
金属露出部が接着剤などによらず被覆フイルムによって
融着被覆された３５０ｍｌのジュース缶胴を製造する。
また、別途、前述のポリエステル被覆鋼板から内容物と
接触する側が被覆層となる様にして缶蓋と缶底を製造す
る。これら缶胴、缶蓋、缶底より、３ピース缶を製造
し、内部に純水３００ｍｌを封入する。このポリエステ
ル被覆３ピース缶を１２５℃に加熱して１時間レトルト
処理を行なう。レトルト処理後の水を回収し、水を留去
して得られた不揮発物の重量Ｍ（μｇ）を測定し、用い
た試料３ピース缶の内部表面積Ｓ（ｃｍ2 ）で除した
値：Ｍ／Ｓ（μｇ／ｃｍ2 ）を低分子量物抽出量とす
る。(2) Extraction amount of low molecular weight substance (μg / c
m 2 ): A sample film is pressure-bonded at low temperature to a steel plate having a thickness of 0.30 mm, which has been subjected to chrome plating treatment using an epoxy resin adhesive, to obtain a polyester-coated steel plate. However, the resin is coated only on one side of the steel sheet. Then, with the surface coated with polyester as the inner side, JP-A-5-6
According to the method disclosed in 9485, a juice can barrel of 350 ml is manufactured in which a metal exposed portion welded and joined is fusion-coated with a coating film without using an adhesive or the like.
Separately, a can lid and a can bottom are manufactured from the above-mentioned polyester-coated steel sheet such that the side that comes into contact with the contents becomes the coating layer. A three-piece can is manufactured from the can body, the can lid, and the can bottom, and 300 ml of pure water is sealed inside. The polyester-coated 3-piece can is heated to 125 ° C. and retort-treated for 1 hour. A value obtained by collecting the water after the retort treatment, measuring the weight M (μg) of the non-volatile matter obtained by distilling off the water, and dividing by the internal surface area S (cm 2 ) of the sample 3-piece can used: M / S (μg / cm 2 ) is defined as the amount of low molecular weight substance extracted.
【００３７】（３）抽出液の外観：レトルト処理後の水
を回収し、キセノン灯を光源としてチンダル現象の観察
を行い、次の様にランク付けによって評価を行う。(3) Appearance of the extract: The water after the retort treatment is collected, the Tyndall phenomenon is observed using a xenon lamp as a light source, and evaluation is performed by ranking as follows.
【表１】◎：レトルト直後および１週間静置後の何れに
おいてもキセノン光路に濁りが観察されない。 ○：レトルト直後においてはキセノン光路に濁りが観察
されず、１週間静置後においては、室内光程度の光量下
で透明であるが、キセノン光路にチンダル現象が観察さ
れる。 Δ：レトルト直後においては室内光程度の光量下で透明
であるが、キセノン光路にチンダル現象が観察され、１
週間静置後においては室内光程度の光量下で肉眼にて水
中浮遊物が観察される。 ×：レトルト直後および１週間静置後の何れにおいても
室内光程度の光量下で肉眼にて水中浮遊物が観察され
る。[Table 1] ⊚: No turbidity is observed in the xenon optical path immediately after retort or after standing for 1 week. ◯: Turbidity was not observed in the xenon optical path immediately after the retort, and after standing for 1 week, it was transparent under a light amount equivalent to room light, but a Tyndall phenomenon was observed in the xenon optical path. Δ: Immediately after the retort, it was transparent under a light amount of room light, but a Tyndall phenomenon was observed in the xenon optical path, and 1
After being allowed to stand for a week, suspended solids in water are observed with the naked eye under an amount of light equivalent to room light. X: A floating substance in water is observed with the naked eye under a light amount of about room light both immediately after retort and after standing for 1 week.
【００３８】（４）末端カルボキシル基濃度（当量／
ｔ） Ｍａｋｒｏｍｌ．ｃｈｅｍ．，２６，２２６（１９５
８）に記載のＡ．Ｃｏｎｉｘの方法に従って測定する。(4) Terminal carboxyl group concentration (equivalent /
t) Makroml. chem. , 26, 226 (195
A. described in 8). It is measured according to the method of Conix.
【００３９】（５）ラミネート性評価 上記（２）で作製したラミネート板から５ｃｍ×２ｃｍ
の矩形試料を切り出し、長辺方向に歪み速度３００％／
ｍｉｎで長さ６ｃｍになる様に引っ張り変形を施し、以
下の様にランク付けする。(5) Evaluation of Laminating Property 5 cm × 2 cm from the laminated plate produced in the above (2)
Cut out a rectangular sample and strain rate 300% /
It is stretched and deformed to a length of 6 cm in min, and ranked as follows.
【表２】○：ポリエステルフイルムと金属が密着してい
る。 Δ：ポリエステルフイルム金属が一部密着している。 ×：ポリエステルフイルムが剥がれている。[Table 2] O: The polyester film and the metal are in close contact with each other. Δ: Part of the polyester film metal is in close contact. X: The polyester film is peeled off.
【００４０】（６）融点（Ｔｍ） セイコー電子工業（株）製の差動熱量計「ＳＳＣ５８０
ＤＳＣ２０型」を用い、試料フイルム１０ｍｇをＤＳ
Ｃ装置にセットし、１０℃／ｍｉｎの速度で昇温し、得
られた結晶融解による吸熱ピークの頂点の温度を融点と
する。ただし、積層フイルムの場合、融点の検出が困難
な場合には、モデル的に単層フイルムとして測定する。(6) Melting point (Tm) Differential calorimeter "SSC580" manufactured by Seiko Instruments Inc.
Using DSC20 type ", 10 mg of sample film is DS
The sample is set in a C apparatus and heated at a rate of 10 ° C./min, and the temperature at the top of the endothermic peak due to the obtained crystal melting is taken as the melting point. However, in the case of a laminated film, when it is difficult to detect the melting point, a single layer film is used as a model for measurement.
【００４１】ポリエステル：テレフタル酸ジメチル７
８部、イソフタル酸ジメチル２２部、エチレングリコー
ル６０部および酢酸カルシウム一水塩０．１部を反応器
に採りりエステル交換反応を行なった。すなわち、反応
開始温度を１７０℃とし、メタノールの留出と共に徐々
に反応温度を上昇させ、４時間後に２３０℃に達せしめ
て実質的にエステル交換反応を終了させた。Polyester: Dimethyl terephthalate 7
8 parts, 22 parts of dimethyl isophthalate, 60 parts of ethylene glycol and 0.1 part of calcium acetate monohydrate were placed in a reactor to carry out a transesterification reaction. That is, the reaction starting temperature was set to 170 ° C., the reaction temperature was gradually raised with the distillation of methanol, and after 4 hours, the temperature was reached to 230 ° C. to substantially end the transesterification reaction.
【００４２】次いで、平均粒径３μｍの無定形酸化珪素
を含有するエチレングリコールスラリーとリン酸０．０
４部を添加した後、三酸化アンチモン０．０４部を添加
して常法により重縮合反応を行った。すなわち、温度を
徐々に高めると共に圧力を徐々に減じ、２時間後に温度
２８０℃、圧力０．３ｍｍＨｇとし、更に、２．５時間
経った時点で反応を停止し、融点が２０３℃、酸化珪素
濃度が０．０５重量％、極限粘度が０．７１、末端カル
ボキシル基が５０当量／ｔであるポリエステルを得
た。Next, an ethylene glycol slurry containing amorphous silicon oxide having an average particle size of 3 μm and phosphoric acid 0.0
After adding 4 parts, 0.04 part of antimony trioxide was added and polycondensation reaction was carried out by a conventional method. That is, the temperature is gradually raised and the pressure is gradually reduced to a temperature of 280 ° C. and a pressure of 0.3 mmHg after 2 hours, and the reaction is stopped after 2.5 hours, and the melting point is 203 ° C. and the silicon oxide concentration is 203 ° C. Of 0.05% by weight, an intrinsic viscosity of 0.71, and a terminal carboxyl group of 50 equivalent / t.
【００４３】ポリエステル：ポリエステルの製造に
おいて、イソフタル酸ジメチルを用いず、テレフタル酸
ジメチルの量を１００部に変更した以外は、同一条件を
採用することにより、融点が２６０℃、酸化珪素濃度が
０．０５重量％、極限粘度が０．６２、末端カルボキシ
ル基が３０当量／ｔであるポリエステルを得た。Polyester: In the production of polyester, the same conditions were adopted except that dimethyl isophthalate was not used and the amount of dimethyl terephthalate was changed to 100 parts, whereby the melting point was 260 ° C. and the silicon oxide concentration was 0. A polyester having an amount of 05% by weight, an intrinsic viscosity of 0.62, and a terminal carboxyl group of 30 equivalents / t was obtained.
【００４４】ポリエステル：純水が入った圧力容器中
に上記で得られたポリエステルを入れ、内温を９０℃
にコントロールして４時間保持した後、水を留去するこ
とにより、ポリエステルを得た。Polyester: The polyester obtained above is put in a pressure vessel containing pure water, and the internal temperature is 90 ° C.
After controlling the temperature to 4 hours and holding it for 4 hours, water was distilled off to obtain a polyester.
【００４５】ポリエステル：ポリエステルの製造に
おいて、イソフタル酸ジメチルを用いず、テレフタル酸
ジメチルの量を１００部、リン酸の添加量を０．０７部
に変更した以外は、同一条件を採用することにより、酸
化珪素を０．０５部含有し、極限粘度が０．４５である
ポリエステルを得た。このポリエステルに、２２５℃、
０．３ｍｍＨｇで１０時間固相重合を施し、融点が２６
０℃、酸化珪素濃度が０．０５重量％、極限粘度［η］
が０．７５、末端カルボキシル基が２０当量／ｔである
ポリエステルを得た。Polyester: In the production of polyester, by using the same conditions, except that dimethyl isophthalate was not used and the amount of dimethyl terephthalate was changed to 100 parts and the addition amount of phosphoric acid was changed to 0.07 part, A polyester containing 0.05 part of silicon oxide and having an intrinsic viscosity of 0.45 was obtained. 225 ℃ to this polyester,
Solid-state polymerization was carried out at 0.3 mmHg for 10 hours, and the melting point was 26.
0 ° C., silicon oxide concentration 0.05% by weight, intrinsic viscosity [η]
Was 0.75 and the terminal carboxyl group was 20 equivalent / t.
【００４６】ポリエステル：純水が入った圧力容器中
に上記で得られたポリエステルを入れ、内温を９０℃
にコントロールして４時間保持した後、水を留去するこ
とにより、ポリエステルを得た。Polyester: The polyester obtained above is put into a pressure vessel containing pure water, and the internal temperature is 90 ° C.
After controlling the temperature to 4 hours and holding it for 4 hours, water was distilled off to obtain a polyester.
【００４７】実施例１ 先ず、層（Ｂ）を構成するポリエステルと層（Ａ）を
構成するポリエステルの各チップを常法に従って乾燥
した後、別々の押出機を用いて溶融し、ギヤポンプを介
してパイプ内で合流させて多層に押出し、キャスティン
グドラム上で急冷し、２種２層の未延伸積層シートを得
た。ポリエステルを押し出しは、押出温度２７５℃、
滞留時間４．５分の条件で行った。Example 1 First, after each chip of the polyester constituting the layer (B) and the polyester constituting the layer (A) was dried by a conventional method, the chips were melted by using different extruders and passed through a gear pump. It was merged in a pipe, extruded in multiple layers, and rapidly cooled on a casting drum to obtain a two-kind two-layer unstretched laminated sheet. Extrusion temperature of 275 ° C.
It was carried out under the condition that the residence time was 4.5 minutes.
【００４８】ロール延伸機を用い、上記のシートを８０
℃で縦方向に３．６倍延伸した後、テンター延伸機を用
い、１００℃で横方向に４．２倍延伸し、引き続き、テ
ンター内にて２３０℃で熱固定を施し、Ａ／Ｂ＝３μｍ
／２２μｍの積層フイルムを得た。Using a roll stretching machine, 80
After stretching 3.6 times in the machine direction in the longitudinal direction at 0 ° C, it was stretched 4.2 times in the transverse direction at 100 ° C using a tenter stretching machine, and subsequently heat set at 230 ° C in a tenter, A / B = 3 μm
A laminated film of / 22 μm was obtained.
【００４９】得られたフイルムをエポキシ樹脂接着剤を
用いてクロムメッキ処理を施した厚み０．３０ｍｍの鋼
板に低温で加圧接着し、層（Ｂ）側を金属に被覆してポ
リエステル被覆鋼板を得た。一方、裏印刷した１２μｍ
の一般包装用フイルムを同様にして金属の反対側に被覆
した。The obtained film was pressure-bonded at a low temperature to a steel plate having a thickness of 0.30 mm which had been subjected to chrome plating using an epoxy resin adhesive, and the layer (B) side was coated with a metal to form a polyester-coated steel plate. Obtained. On the other hand, back printed 12 μm
The general packaging film of No. 3 was similarly coated on the opposite side of the metal.
【００５０】次いで、得られた両面被覆金属板の印刷面
の反対側の被覆フイルムを内側とし、特開平５−６９４
８５号公報に開示されている方法により、溶接接合され
た金属露出部が接着剤などによらずに被覆フイルムによ
って融着被覆された３５０ｍｌのジュース缶胴を製造し
た。また、別途、前述のポリエステル被覆鋼板から内容
物と接触する側が被覆層となる様にして缶蓋と缶底を製
造した。そして、これらの缶胴、缶蓋、缶底から、３ピ
ース缶を製造した。得られた３ピース缶について、低分
子量物抽出量、抽出液の物外観などを評価し、その結果
を表３に示した。Then, the coated film on the opposite side of the printed surface of the obtained double-sided coated metal plate is set to the inside, and the method is described in JP-A-5-694.
According to the method disclosed in Japanese Patent Publication No. 85, a juice can barrel of 350 ml in which the exposed metal portion welded and joined was fusion-coated with a coating film without using an adhesive or the like was manufactured. Separately, a can lid and a can bottom were manufactured from the above polyester-coated steel sheet such that the side in contact with the contents became the coating layer. Then, a 3-piece can was manufactured from the can body, the can lid, and the can bottom. The obtained 3-piece cans were evaluated for the amount of extracted low molecular weight substances, the appearance of the extracted liquid, and the like, and the results are shown in Table 3.
【００５１】実施例２ 実施例１において、層（Ａ）を構成するポリエステル
の代りにポリエステルを用いた以外は、実施例１と同
様に製膜し、Ａ／Ｂ＝３μｍ／２２μｍの積層フイルム
を得た。次いで、実施例１同様にして３ピース缶を製造
した。その評価結果を表３に示した。Example 2 A laminated film having A / B = 3 μm / 22 μm was formed in the same manner as in Example 1 except that polyester was used instead of the polyester constituting the layer (A). Obtained. Then, a three-piece can was manufactured in the same manner as in Example 1. The evaluation results are shown in Table 3.
【００５２】実施例３ 実施例１において、ポリエステルとして、層（Ａ）を構
成するポリエステル、層（Ｂ）を構成するポリエステ
ル及び層（Ｃ）を構成する再生ポリマー（自己サイク
ルポリエステル）を用いた以外は、実施例１と同様に製
膜し、Ａ／Ｃ／Ｂ＝３μｍ／１７μｍ／５μｍの積層フ
イルムを得た。次いで、実施例１同様にして３ピース缶
を製造した。その評価結果を表３に示した。Example 3 In Example 1, except that the polyester forming the layer (A), the polyester forming the layer (B), and the recycled polymer (self-cycled polyester) forming the layer (C) were used as the polyester. Was formed in the same manner as in Example 1 to obtain a laminated film having A / C / B = 3 μm / 17 μm / 5 μm. Then, a three-piece can was manufactured in the same manner as in Example 1. The evaluation results are shown in Table 3.
【００５３】比較例１ 実施例１において、ポリエステルのみを用い、熱固定
温度を１９０℃に変更した以外は、実施例１と同様に製
膜し、厚さ２５μｍの単層フイルムを得た。次いで、実
施例１同様にして３ピース缶を製造した。その評価結果
を表３に示した。Comparative Example 1 A film having a thickness of 25 μm was obtained in the same manner as in Example 1 except that only polyester was used and the heat setting temperature was changed to 190 ° C. Then, a three-piece can was manufactured in the same manner as in Example 1. The evaluation results are shown in Table 3.
【００５４】比較例２ 実施例１において、ポリエステルのみを用いた以外
は、実施例１と同様に製膜し、厚さ２５μｍの単層フイ
ルムを得た。次いで、実施例１同様にして３ピース缶を
製造した。その評価結果を表３に示した。Comparative Example 2 A film was formed in the same manner as in Example 1 except that only polyester was used to obtain a single-layer film having a thickness of 25 μm. Then, a three-piece can was manufactured in the same manner as in Example 1. The evaluation results are shown in Table 3.
【００５５】[0055]
【表３】 ──────────────────────────────────── 実施例 比較例 １ ２ ３ １ ２ 抽出物量（μｇ／ｃｍ2 ） 0.7 0.6 0.7 4.2 2.1 抽出液の外観 ○ ◎ ◎ × △ ラミネート性 ○ ○ ○ ○ × 末端カルボキシル基濃度（当量／ｇ） 35 25 25 60 38 ────────────────────────────────────[Table 3] ──────────────────────────────────── Examples Comparative Examples 1 2 3 1 2 Extraction Physical quantity (μg / cm 2 ) 0.7 0.6 0.7 4.2 2.1 Appearance of extract ○ ◎ ◎ × △ Laminating property ○ ○ ○ ○ × Terminal carboxyl group concentration (equivalent / g) 35 25 25 60 38 ───────── ────────────────────────────
【００５６】[0056]
【発明の効果】以上説明した本発明によれば、３ピース
缶の内缶被覆用積層ポリエステルフイルムが提供される
が、本発明の積層フイルムは、ラミネート適正が良好で
あり、本発明の積層フイルムを被覆した３ピース缶は、
抽出物の発生の少ないと言う優れた効果を有する。According to the present invention described above, a laminated polyester film for coating an inner can of a three-piece can is provided. However, the laminated film of the present invention has good laminating suitability and the laminated film of the present invention. 3 piece cans coated with
It has an excellent effect that the amount of extract is small.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ６５Ｄ 25/14 Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B65D 25/14 A
Claims (2)
ルフイルムであって、内容物に接する側に位置するポリ
エステル層（Ａ）は、融点が２３０〜２８０℃のポリエ
ステル（ａ）で構成され、金属に被覆される側に位置す
るポリエステル層（Ｂ）は、融点が１７０〜２８０℃で
且つポリエステル（ａ）のそれより少なくとも５℃低い
ポリエステル（ｂ）で構成され、しかも、金属に被覆さ
れ且つ製缶後の測定において、純水１２５℃１時間のレ
トルト処理した際に抽出されるポリエステル（ａ）の低
分子量物は、被覆表面１ｃｍ2 当たり２．０μｇ以下で
あり、ポリエステル（ａ）の末端カルボキシル基濃度
は、５０当量／ｔ未満であることを特徴とする３ピース
缶の内缶被覆用積層ポリエステルフイルム。1. A laminated polyester film for coating an inner can of a three-piece can, wherein the polyester layer (A) located on the side in contact with the content is composed of a polyester (a) having a melting point of 230 to 280 ° C. The polyester layer (B) located on the side coated with metal is composed of polyester (b) having a melting point of 170 to 280 ° C. and at least 5 ° C. lower than that of polyester (a), and further coated with metal and In the measurement after can making, the low molecular weight product of the polyester (a) extracted when the retort treatment was performed at 125 ° C. for 1 hour in pure water was 2.0 μg or less per cm 2 of the coating surface, and the end of the polyester (a) was A laminated polyester film for coating an inner can of a three-piece can, which has a carboxyl group concentration of less than 50 equivalents / t.
チレンテレフタートから成る請求項１に記載の３ピース
缶の内缶被覆用積層ポリエステルフイルム。2. A laminated polyester film for coating an inner can of a three-piece can according to claim 1, wherein the polyester layer (A) is mainly composed of polyethylene terephthalate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05298971A JP3129897B2 (en) | 1993-11-04 | 1993-11-04 | Laminated polyester film for inner surface coating of 3-piece cans |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05298971A JP3129897B2 (en) | 1993-11-04 | 1993-11-04 | Laminated polyester film for inner surface coating of 3-piece cans |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07125166A true JPH07125166A (en) | 1995-05-16 |
| JP3129897B2 JP3129897B2 (en) | 2001-01-31 |
Family
ID=17866561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05298971A Expired - Lifetime JP3129897B2 (en) | 1993-11-04 | 1993-11-04 | Laminated polyester film for inner surface coating of 3-piece cans |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3129897B2 (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09302113A (en) * | 1996-05-16 | 1997-11-25 | Toray Ind Inc | Biaxially oriented polyester film for molding container |
| JPH10128935A (en) * | 1996-09-09 | 1998-05-19 | Toray Ind Inc | Biaxially oriented polyester film for molding container |
| JPH10279708A (en) * | 1997-02-05 | 1998-10-20 | Toray Ind Inc | Biaxially oriented polyester film for forming container and its production |
| JPH10305541A (en) * | 1997-03-06 | 1998-11-17 | Toray Ind Inc | Biaxially oriented polyester film for laminate |
| JPH1179189A (en) * | 1997-09-09 | 1999-03-23 | Kishimoto Akira | Resin-coated container having good flavor-retaining property |
| JPH11254623A (en) * | 1998-03-12 | 1999-09-21 | Toray Ind Inc | Polyester film for lamination molding/fabrication with metal plate |
| JP2000071406A (en) * | 1998-09-03 | 2000-03-07 | Mitsubishi Polyester Film Copp | Polyester film for covering metal container |
| JP2000103024A (en) * | 1998-09-29 | 2000-04-11 | Mitsubishi Polyester Film Copp | Polyester film for metal lamination |
| JP2000108284A (en) * | 1998-10-02 | 2000-04-18 | Mitsubishi Polyester Film Copp | Metal laminating polyester film |
| JP2001233334A (en) * | 2000-02-18 | 2001-08-28 | Toyo Seikan Kaisha Ltd | Welded can drum and manufacturing method therefor |
| JP2002274537A (en) * | 2001-03-14 | 2002-09-25 | Daiwa Can Co Ltd | Method for manufacturing a welding can barrel for 3- piece can |
| JP2003080654A (en) * | 2001-09-13 | 2003-03-19 | Teijin Dupont Films Japan Ltd | Laminated polyester film used to be laminated three- piece metal can |
| JP2004189318A (en) * | 2002-12-13 | 2004-07-08 | Mitsubishi Materials Corp | Laminated material, manufacturing method for the same, and laminated can lid |
| JP2005096444A (en) * | 2003-09-01 | 2005-04-14 | Toyobo Co Ltd | Polyester film for coating metal sheet, polyester film coated metal sheet and polyester film coated metal container |
| JP2006321508A (en) * | 2005-05-17 | 2006-11-30 | Toyo Seikan Kaisha Ltd | Seamless aluminum square can |
| JP2017100344A (en) * | 2015-12-01 | 2017-06-08 | 帝人フィルムソリューション株式会社 | Film for metal laminate mold processing |
| JP2017222807A (en) * | 2016-06-17 | 2017-12-21 | 東レ株式会社 | Polyester film |
| WO2019124416A1 (en) * | 2017-12-22 | 2019-06-27 | 東洋製罐株式会社 | Organic-resin-coated two-piece aluminum can |
-
1993
- 1993-11-04 JP JP05298971A patent/JP3129897B2/en not_active Expired - Lifetime
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09302113A (en) * | 1996-05-16 | 1997-11-25 | Toray Ind Inc | Biaxially oriented polyester film for molding container |
| JPH10128935A (en) * | 1996-09-09 | 1998-05-19 | Toray Ind Inc | Biaxially oriented polyester film for molding container |
| JPH10279708A (en) * | 1997-02-05 | 1998-10-20 | Toray Ind Inc | Biaxially oriented polyester film for forming container and its production |
| JPH10305541A (en) * | 1997-03-06 | 1998-11-17 | Toray Ind Inc | Biaxially oriented polyester film for laminate |
| JPH1179189A (en) * | 1997-09-09 | 1999-03-23 | Kishimoto Akira | Resin-coated container having good flavor-retaining property |
| JPH11254623A (en) * | 1998-03-12 | 1999-09-21 | Toray Ind Inc | Polyester film for lamination molding/fabrication with metal plate |
| JP2000071406A (en) * | 1998-09-03 | 2000-03-07 | Mitsubishi Polyester Film Copp | Polyester film for covering metal container |
| JP2000103024A (en) * | 1998-09-29 | 2000-04-11 | Mitsubishi Polyester Film Copp | Polyester film for metal lamination |
| JP2000108284A (en) * | 1998-10-02 | 2000-04-18 | Mitsubishi Polyester Film Copp | Metal laminating polyester film |
| JP2001233334A (en) * | 2000-02-18 | 2001-08-28 | Toyo Seikan Kaisha Ltd | Welded can drum and manufacturing method therefor |
| JP2002274537A (en) * | 2001-03-14 | 2002-09-25 | Daiwa Can Co Ltd | Method for manufacturing a welding can barrel for 3- piece can |
| JP4587423B2 (en) * | 2001-03-14 | 2010-11-24 | 大和製罐株式会社 | Manufacturing method of welded can body for 3 piece can |
| JP2003080654A (en) * | 2001-09-13 | 2003-03-19 | Teijin Dupont Films Japan Ltd | Laminated polyester film used to be laminated three- piece metal can |
| JP2004189318A (en) * | 2002-12-13 | 2004-07-08 | Mitsubishi Materials Corp | Laminated material, manufacturing method for the same, and laminated can lid |
| JP2005096444A (en) * | 2003-09-01 | 2005-04-14 | Toyobo Co Ltd | Polyester film for coating metal sheet, polyester film coated metal sheet and polyester film coated metal container |
| JP4655551B2 (en) * | 2003-09-01 | 2011-03-23 | 東洋紡績株式会社 | Polyester film for metal plate coating, polyester film coated metal plate, and polyester film coated metal container |
| JP2006321508A (en) * | 2005-05-17 | 2006-11-30 | Toyo Seikan Kaisha Ltd | Seamless aluminum square can |
| JP4583239B2 (en) * | 2005-05-17 | 2010-11-17 | 東洋製罐株式会社 | Seamless aluminum square can |
| JP2017100344A (en) * | 2015-12-01 | 2017-06-08 | 帝人フィルムソリューション株式会社 | Film for metal laminate mold processing |
| JP2017222807A (en) * | 2016-06-17 | 2017-12-21 | 東レ株式会社 | Polyester film |
| WO2019124416A1 (en) * | 2017-12-22 | 2019-06-27 | 東洋製罐株式会社 | Organic-resin-coated two-piece aluminum can |
| JPWO2019124416A1 (en) * | 2017-12-22 | 2020-12-10 | 東洋製罐株式会社 | Organic resin coated two-piece aluminum can |
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