JP2001179903A - Laminated foamed sheet and container - Google Patents
Laminated foamed sheet and containerInfo
- Publication number
- JP2001179903A JP2001179903A JP36755999A JP36755999A JP2001179903A JP 2001179903 A JP2001179903 A JP 2001179903A JP 36755999 A JP36755999 A JP 36755999A JP 36755999 A JP36755999 A JP 36755999A JP 2001179903 A JP2001179903 A JP 2001179903A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cell
- diameter
- resin
- foamed
- 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.)
- Pending
Links
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 135
- 229920005989 resin Polymers 0.000 claims abstract description 103
- 239000011347 resin Substances 0.000 claims abstract description 103
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 67
- 238000003856 thermoforming Methods 0.000 claims abstract description 45
- 239000006260 foam Substances 0.000 claims description 235
- 229920005990 polystyrene resin Polymers 0.000 claims description 71
- 239000004793 Polystyrene Substances 0.000 claims description 26
- 229920002223 polystyrene Polymers 0.000 claims description 26
- 238000007639 printing Methods 0.000 abstract description 11
- 239000010410 layer Substances 0.000 description 417
- 208000000649 small cell carcinoma Diseases 0.000 description 90
- 201000003445 large cell neuroendocrine carcinoma Diseases 0.000 description 72
- 239000000203 mixture Substances 0.000 description 38
- 238000000034 method Methods 0.000 description 28
- 238000012360 testing method Methods 0.000 description 27
- 238000001125 extrusion Methods 0.000 description 21
- 238000005259 measurement Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 19
- 239000004088 foaming agent Substances 0.000 description 18
- 239000000454 talc Substances 0.000 description 14
- 229910052623 talc Inorganic materials 0.000 description 14
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 12
- 229920001577 copolymer Polymers 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- -1 pentane and hexane Chemical compound 0.000 description 11
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 10
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 8
- 239000000706 filtrate Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 238000005187 foaming Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 235000013305 food Nutrition 0.000 description 6
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 229920006248 expandable polystyrene Polymers 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004604 Blowing Agent Substances 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229920005604 random copolymer Polymers 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 239000002216 antistatic agent Substances 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 239000012760 heat stabilizer Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000002667 nucleating agent Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 229920005669 high impact polystyrene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 239000004797 high-impact polystyrene Substances 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920001955 polyphenylene ether Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 229920005675 propylene-butene random copolymer Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 150000003440 styrenes Chemical class 0.000 description 2
- 239000013638 trimer Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- BHNZEZWIUMJCGF-UHFFFAOYSA-N 1-chloro-1,1-difluoroethane Chemical compound CC(F)(F)Cl BHNZEZWIUMJCGF-UHFFFAOYSA-N 0.000 description 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- JQXYBDVZAUEPDL-UHFFFAOYSA-N 2-methylidene-5-phenylpent-4-enoic acid Chemical compound OC(=O)C(=C)CC=CC1=CC=CC=C1 JQXYBDVZAUEPDL-UHFFFAOYSA-N 0.000 description 1
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 241000206601 Carnobacterium mobile Species 0.000 description 1
- PMPVIKIVABFJJI-UHFFFAOYSA-N Cyclobutane Chemical compound C1CCC1 PMPVIKIVABFJJI-UHFFFAOYSA-N 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229920007962 Styrene Methyl Methacrylate Polymers 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- 238000003854 Surface Print Methods 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 description 1
- HRYZWHHZPQKTII-UHFFFAOYSA-N chloroethane Chemical compound CCCl HRYZWHHZPQKTII-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 229960003750 ethyl chloride Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 1
- 239000004619 high density foam Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 229910001872 inorganic gas Inorganic materials 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 235000013847 iso-butane Nutrition 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
- 239000004620 low density foam Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- ADFPJHOAARPYLP-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;styrene Chemical compound COC(=O)C(C)=C.C=CC1=CC=CC=C1 ADFPJHOAARPYLP-UHFFFAOYSA-N 0.000 description 1
- 229940073584 methylene chloride Drugs 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- HWPKGOGLCKPRLZ-UHFFFAOYSA-M monosodium citrate Chemical compound [Na+].OC(=O)CC(O)(C([O-])=O)CC(O)=O HWPKGOGLCKPRLZ-UHFFFAOYSA-M 0.000 description 1
- 235000018342 monosodium citrate Nutrition 0.000 description 1
- 239000002524 monosodium citrate Substances 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 1
- 229940029284 trichlorofluoromethane Drugs 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、積層発泡シート及
び該積層発泡シートから熱成形によって得られる容器に
関し、より詳しくは軽量であるにもかかわらず強度が優
れた積層発泡シートであって、深絞り成形に好適な積層
発泡シート、及び該積層発泡シートに熱可塑性樹脂が積
層された積層発泡シートから熱成形によって得られる容
器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated foamed sheet and a container obtained by thermoforming the laminated foamed sheet. More specifically, the present invention relates to a laminated foamed sheet which is lightweight but has excellent strength, The present invention relates to a laminated foam sheet suitable for drawing and a container obtained by thermoforming from a laminated foam sheet in which a thermoplastic resin is laminated on the laminated foam sheet.
【０００２】[0002]
【従来の技術】従来から、ポリスチレン系樹脂発泡シー
トが広く知られ、該ポリスチレン系樹脂発泡シートから
熱成形によって得られた弁当箱、トレイ、丼、カップ等
の食品用容器が広く用いられてきた。2. Description of the Related Art Hitherto, polystyrene resin foam sheets have been widely known, and food containers such as lunch boxes, trays, bowls, cups and the like obtained by thermoforming from the polystyrene resin foam sheets have been widely used. .
【０００３】上記食品用容器は、食品の包装材としての
使用に耐えることができる強度、特に剛性を必要とし、
食品用容器が必要とする強度を得るための手段として、
該食品の素材となるポリスチレン系樹脂の樹脂量を多く
する、ポリスチレン系樹脂発泡シートを厚くする、成形
品にリブを付けて構造的に強くする等の方法が用いられ
てきた。[0003] The above-mentioned food container requires strength, particularly rigidity, that can withstand use as a food packaging material.
As a means to obtain the strength required by food containers,
Methods such as increasing the amount of polystyrene resin used as the material of the food, increasing the thickness of the foamed polystyrene resin sheet, and attaching ribs to the molded product to strengthen the structure have been used.
【０００４】又、特開平８−１１９３１８号公報におい
ては、ポリスチレン系樹脂発泡シートを高密度の発泡シ
ート層と低密度の発泡シート層とからなる二層構造の積
層シートとし、該積層シートの高密度発泡シート側を内
側として容器等の成形品を熱成形することが提案されて
いる。又、同公報においては、上記積層シートに樹脂製
のフィルムを積層することによって、更に強度を向上さ
せることも提案されている。In Japanese Patent Application Laid-Open No. HEI 8-119318, a polystyrene resin foam sheet is formed into a two-layer laminated sheet composed of a high-density foam sheet layer and a low-density foam sheet layer. It has been proposed to thermoform a molded article such as a container with the density foam sheet side inside. In the same publication, it is also proposed to further improve the strength by laminating a resin film on the laminated sheet.
【０００５】しかしながら、上記いずれの方法も充分な
強度の成形品を得るという点では未だ不充分な方法であ
った。又、上記食品用容器は、充分な強度を有するだけ
でなく、軽量であること、美麗であること、美麗な印刷
を施すことができることも要求されている。従って、食
品容器の素材となるポリスチレン系樹脂発泡シートも同
様に、充分な強度を有すること、軽量であること、深絞
り形状の熱成形が可能であること、美麗であること、美
麗な印刷を施すこと等ができることが要求されている。[0005] However, any of the above methods is still insufficient in obtaining a molded product having sufficient strength. Further, the food container is required to have not only sufficient strength, but also light weight, beautiful, and capable of performing beautiful printing. Therefore, the foamed polystyrene resin sheet used as the material of the food container should also have sufficient strength, be lightweight, be capable of being deep-drawn thermoforming, be beautiful, and be beautifully printed. It is required that it can be applied.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、軽量であっ
ても充分な強度、特に剛性を有し、深絞り形状の熱成形
が可能であると共に美麗な積層発泡シート、及び該積層
発泡シートから熱成形によって得られる容器であって、
軽量であっても、充分な剛性を有し、美麗な印刷を施す
ことができる容器を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention relates to a laminated foam sheet which has sufficient strength, especially rigidity even if it is lightweight, is capable of thermoforming deep drawn shapes, and is beautiful. A container obtained by thermoforming from
It is an object of the present invention to provide a container which is lightweight, has sufficient rigidity, and can perform beautiful printing.
【０００７】[0007]
【課題を解決するための手段】本発明の積層発泡シート
は、平均気泡径Ｌ１が１５０〜４５０μｍのポリスチレ
ン系樹脂第一発泡層と、平均気泡径Ｌ２が３５〜１８０
μｍのポリスチレン系樹脂第二発泡層（但し、平均気泡
径Ｌ１＞平均気泡径Ｌ２）と、上記ポリスチレン系樹脂
第一発泡層と上記ポリスチレン系樹脂第二発泡層の間に
熱可塑性樹脂補強層が設けられていることを特徴とす
る。The laminated foamed sheet of the present invention comprises a first foamed layer of a polystyrene resin having an average cell diameter L1 of 150 to 450 μm, and an average cell diameter L2 of 35 to 180.
μm polystyrene resin second foam layer (however, average cell diameter L1> average cell diameter L2) and a thermoplastic resin reinforcement layer between the polystyrene resin first foam layer and the polystyrene resin second foam layer. It is characterized by being provided.
【０００８】上記ポリスチレン系樹脂第一発泡層の密度
は、５０〜７００ｋｇ／ｍ3であることが好ましく、上
記ポリスチレン系樹脂第二発泡層の密度は、５０〜７０
０ｋｇ／ｍ3であることが好ましい。The density of the first polystyrene resin foam layer is preferably 50 to 700 kg / m 3 , and the density of the second polystyrene resin foam layer is 50 to 70 kg / m 3.
It is preferably 0 kg / m 3 .
【０００９】上記熱可塑性樹脂補強層は、密度８００ｋ
ｇ／ｍ3以上のポリスチレン系樹脂であることが好まし
い。The above-mentioned thermoplastic resin reinforcing layer has a density of 800 k.
g / m 3 or more of a polystyrene resin.
【００１０】上記ポリスチレン系樹脂第一発泡層の低分
子量成分含有率は、２０００重量ｐｐｍ以下であること
が好ましい。The content of the low molecular weight component in the first foamed layer of the polystyrene resin is preferably 2,000 ppm by weight or less.
【００１１】上記ポリスチレン系樹脂第二発泡層の表面
には、最外層を構成する熱可塑性樹脂層が設けられてい
ることが好ましい。It is preferable that a thermoplastic resin layer constituting the outermost layer is provided on the surface of the second polystyrene resin foam layer.
【００１２】本発明の容器は、上記最積層発泡シートを
熱成形して得られた容器であって、ポリスチレン系樹脂
第一発泡層が内面側に位置することを特徴とする。[0012] The container of the present invention is a container obtained by thermoforming the above-mentioned laminated foam sheet, wherein the first foamed layer of polystyrene resin is located on the inner surface side.
【００１３】[0013]
【発明の実施の形態】本発明の積層発泡シートは、図１
に示すように、ポリスチレン系樹脂第一発泡層（以下、
「大気泡径発泡層」という。）とポリスチレン系樹脂第
二発泡層（以下、「小気泡径発泡層」という。）と大気
泡径発泡層と小気泡径発泡との間に設けられた熱可塑性
樹脂補強層とからなる。尚、図１は、本発明の積層発泡
シートの縦断面図であって、図１において、１は積層発
泡シートを、２は大気泡径発泡層を、３は小気泡径発泡
層を、４は熱可塑性樹脂補強層をそれぞれ示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The laminated foam sheet of the present invention is shown in FIG.
As shown in the first polystyrene resin foam layer (hereinafter, referred to as
It is referred to as a "large cell foam layer". ), A second polystyrene resin foam layer (hereinafter referred to as a “small cell diameter foam layer”), and a thermoplastic resin reinforcing layer provided between the large cell diameter foam layer and the small cell diameter foam. FIG. 1 is a longitudinal sectional view of the laminated foam sheet of the present invention. In FIG. 1, 1 is a laminated foam sheet, 2 is a large-cell-diameter foam layer, 3 is a small-cell-diameter foam layer, and 4 is a small-cell-diameter foam layer. Indicates a thermoplastic resin reinforcing layer, respectively.
【００１４】本発明の大気泡径発泡層２及び小気泡径発
泡層３を構成する基材樹脂は、ポリスチレン系樹脂であ
って、該ポリスチレン系樹脂はスチレンの単独重合体及
び共重合体を包含する。該共重合体は、下記の一般式
（１）で表されるスチレン系モノマーを共重合成分とし
て含有するものが好ましく、該共重合成分のモノマー単
位の含有量は、２５重量％以上が好ましく、５０重量％
以上がより好ましい。The base resin constituting the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 of the present invention is a polystyrene resin, and the polystyrene resin includes a styrene homopolymer and a copolymer. I do. The copolymer preferably contains a styrenic monomer represented by the following general formula (1) as a copolymer component, and the content of the monomer unit of the copolymer component is preferably 25% by weight or more, 50% by weight
The above is more preferable.
【００１５】[0015]
【化１】 上記一般式（１）において、Ｒは水素原子またはメチル
基を示し、Ｚはハロゲン原子またはメチル基を示し、ｐ
は０または１〜３の整数である。Embedded image In the general formula (1), R represents a hydrogen atom or a methyl group, Z represents a halogen atom or a methyl group, p
Is 0 or an integer of 1 to 3.
【００１６】上記スチレンの単独重合体や共重合体は、
ポリスチレン、ゴム変性ポリスチレン、スチレン−アク
リロニトリル共重合体、スチレン−ブタジエン−アクリ
ロニトリル共重合体、スチレン−アクリル酸共重合体、
スチレン−メタクリル酸共重合体、スチレン−メタクリ
ル酸メチル共重合体、スチレン−メタクリル酸エチル共
重合体、スチレン−アクリル酸メチル共重合体、スチレ
ン−アクリル酸エチル共重合体、スチレン−無水マレイ
ン酸共重合体、ポリスチレン−ポリフェニレンエーテル
共重合体、ポリスチレンとポリフェニレンエーテルとの
混合物などが例示される。The styrene homopolymer or copolymer is
Polystyrene, rubber-modified polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, styrene-acrylic acid copolymer,
Styrene-methacrylic acid copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-maleic anhydride copolymer Examples thereof include a polymer, a polystyrene-polyphenylene ether copolymer, and a mixture of polystyrene and polyphenylene ether.
【００１７】本発明において用いるポリスチレン系樹脂
は、ビカット軟化点が１００℃以上であることが好まし
く、電子レンジの加熱に耐え得る耐熱性を有するという
観点からは、１１０℃以上であることがより好ましい。
ビカット軟化点が１００℃未満の場合は、熱成形によっ
て得られる容器の耐熱性が悪く、熱湯を入れると容器が
変形する虞がある。尚、該ビカット軟化点はＪＩＳ Ｋ
７２０６（試験荷重はＡ法、伝熱媒体の昇温速度は５０
℃／時）にて求められる。The polystyrene resin used in the present invention preferably has a Vicat softening point of 100 ° C. or higher, and more preferably 110 ° C. or higher from the viewpoint of having heat resistance enough to withstand heating in a microwave oven. .
When the Vicat softening point is lower than 100 ° C., the heat resistance of the container obtained by thermoforming is poor, and the container may be deformed when hot water is added. The Vicat softening point is JIS K
7206 (test load was A method, heat transfer medium heating rate was 50
° C / hour).
【００１８】本発明で用いられるポリスチレン系樹脂
は、その溶融粘度が、１９０℃、剪断速度１００／ｓｅ
ｃの条件において、２０Ｐａ・ｓ〜１００００Ｐａ・ｓ
であることが好ましく、１００〜５０００Ｐａ・ｓであ
ることがより好ましい。該溶融粘度が２０Ｐａ・ｓ未満
では、発泡層形成時にダイより押出された溶融樹脂を引
取ることができず、発泡層の形成が困難になる虞れがあ
る。一方、１００００Ｐａ・ｓを超えると、粘度が高す
ぎて押出圧力が上昇しすぎっるので押出成形が困難にな
り、良質の大気泡径発泡層２，小気泡径発泡層発泡層３
を得ることができなくなる虞れがある。The polystyrene resin used in the present invention has a melt viscosity of 190 ° C. and a shear rate of 100 / sec.
Under the condition of c, 20 Pa · s to 10000 Pa · s
And more preferably 100 to 5000 Pa · s. If the melt viscosity is less than 20 Pa · s, the molten resin extruded from the die during the formation of the foamed layer cannot be taken, and the formation of the foamed layer may be difficult. On the other hand, if it exceeds 10,000 Pa · s, the viscosity is too high and the extrusion pressure is too high, so that extrusion molding becomes difficult, and a high-quality large-cell-diameter foam layer 2 and a small-cell-diameter foam layer 3
May not be obtained.
【００１９】本発明においては、上記ポリスチレン系樹
脂に、脆性改善等を目的として耐衝撃性ポリスチレン、
スチレン−共役ジエンブロック共重合体や、該共重合体
の水添物を添加することができる。又、大気泡径発泡層
２と小気泡径発泡層発泡層３を構成するポリスチレン系
樹脂として同一のものを用いる必要はなく、各々に異な
るポリスチレン系樹脂を用いることができる。In the present invention, impact-resistant polystyrene, for the purpose of improving brittleness, etc., is added to the polystyrene resin.
A styrene-conjugated diene block copolymer or a hydrogenated product of the copolymer can be added. Further, it is not necessary to use the same polystyrene-based resin for forming the large-cell-diameter foamed layer 2 and the small-cell-diameter foamed-layer foamed layer 3, and different polystyrene-based resins can be used for each.
【００２０】上記ポリスチレン系樹脂には、本発明の目
的を著しく損なわない範囲で、必要に応じて各種の添加
剤、例えば、造核剤、酸化防止剤、熱安定剤、帯電防止
剤、導電性付与剤、耐候剤、紫外線吸収剤、難燃剤、無
機充填剤等を添加することができる。Various additives may be added to the polystyrene-based resin, if necessary, such as a nucleating agent, an antioxidant, a heat stabilizer, an antistatic agent, and a conductive agent, as long as the object of the present invention is not significantly impaired. Additives, weathering agents, ultraviolet absorbers, flame retardants, inorganic fillers and the like can be added.
【００２１】本発明の大気泡径発泡層２は、スチレン二
量体及び三量体の成分（以下、併せて「低分子量成分」
という。）が２０００重量ｐｐｍ以下、より好ましくは
１０００重量ｐｐｍ以下の大気泡径発泡層２として構成
することが好ましい。該成分を２０００重量ｐｐｍ以下
にすると、特に剛性に優れた積層発泡シート１を得るこ
とができる。更に、後述する大気泡径発泡層２を低分子
量成分が２０００重量ｐｐｍ以下、より好ましくは１０
００重量ｐｐｍ以下として構成し、該大気泡径発泡層２
を容器の内側に向けて熱成形すると、従来の容器に比較
するとより開口部の剛性に優れ、内面が傷つきにくい容
器を得ることができる。The large-cell-diameter foamed layer 2 of the present invention comprises styrene dimer and trimer components (hereinafter collectively referred to as “low molecular weight components”).
That. ) Is preferably 2000 mass ppm or less, more preferably 1000 mass ppm or less. When the content of the component is 2,000 ppm by weight or less, the laminated foam sheet 1 having particularly excellent rigidity can be obtained. Further, a large-cell-diameter foam layer 2 described below contains a low-molecular-weight component in an amount of 2000 ppm by weight or less, more preferably 10 ppm by weight or less.
00 ppm by weight or less, and the large-cell-diameter foamed layer 2
When the thermoforming is performed toward the inside of the container, a container having higher rigidity of the opening and having a hard inner surface can be obtained as compared with a conventional container.
【００２２】本発明において、上記ポリスチレン系樹脂
発泡層中の低分子量成分とは、以下のようにして測定し
た値である。In the present invention, the low molecular weight component in the polystyrene resin foam layer is a value measured as follows.
【００２３】試料の調整及び測定は次のように行なう。 １．ポリスチレン系樹脂発泡層約０．２ｇを正確に秤量
し、ビーカー中において約１５ｍｌのテトラヒドロフラ
ンに溶解させる。 ２．ポリスチレン系樹脂発泡層がテトラヒドロフランに
完全に溶解したことを確認した後、該約１５ｍｌのテト
ラヒドロフラン溶液を、約２５０ｍｌのｎ−ペンタン中
に滴下してポリスチレン系樹脂を析出させる。次に、上
記１５ｍｌのビーカー中に約５ｍｌのテトラヒドロフラ
ンを入れてビーカー中を洗浄し、該洗浄に使用した約５
ｍｌのテトラヒドロフランを前記約２５０ｍｌのｎ−ペ
ンタン中に滴下することにより洗浄操作を行なう。該洗
浄操作は二回行なう。 ３．上記ｎ−ペンタン中に滴下したポリスチレン系樹脂
を、Ｎｏ．５Ｂのろ紙を使用してビーカー中にろ別す
る。尚、ろ過は、吸引ろ過は行なわず、自然ろ過を行な
う。 ４．上記ろ液の入ったビーカーを１５℃の水浴にて保温
しつつ、コンプレッサーエアーをろ液に吹きかけながら
６〜８時間かけて、ろ液を約１００ｍｌに濃縮する。 ５．上記約１００ｍｌに濃縮されたろ液に約４０ｍｌの
アセトニトリルを加え、更に１５℃の水浴にて保温しつ
つ、コンプレッサーエアーをろ液に吹きかけながら２〜
３時間かけて、ろ液を約６〜９ｍｌに濃縮する。。 ６．上記約６〜９ｍｌに濃縮されたろ液にアセトニトリ
ルを加え、全量が１０ｍｌとなるように希釈したものを
測定用試料とする。 ７．上記測定試料を下記仕様の高速液体クロマトグラフ
に注入して、ポリスチレン系樹脂発泡層中の低分子量成
分の含有量を測定する。The preparation and measurement of the sample are performed as follows. 1. About 0.2 g of the polystyrene resin foam layer is accurately weighed and dissolved in about 15 ml of tetrahydrofuran in a beaker. 2. After confirming that the polystyrene resin foam layer is completely dissolved in tetrahydrofuran, about 15 ml of the tetrahydrofuran solution is dropped into about 250 ml of n-pentane to precipitate the polystyrene resin. Next, about 5 ml of tetrahydrofuran was put into the above 15 ml beaker, and the inside of the beaker was washed.
The washing operation is carried out by dropping ml of tetrahydrofuran into about 250 ml of n-pentane. The washing operation is performed twice. 3. The polystyrene-based resin dropped into the n-pentane described above was Filter out into a beaker using 5B filter paper. In addition, filtration does not perform suction filtration but performs natural filtration. 4. The beaker containing the filtrate is kept warm in a water bath at 15 ° C., and the filtrate is concentrated to about 100 ml over 6 to 8 hours while blowing compressor air on the filtrate. 5. About 40 ml of acetonitrile was added to the above filtrate concentrated to about 100 ml, and while keeping the temperature in a water bath at 15 ° C., the filtrate was blown with compressor air for 2 to 2 hours.
The filtrate is concentrated to about 6-9 ml over 3 hours. . 6. Acetonitrile was added to the above filtrate concentrated to about 6 to 9 ml, and the filtrate was diluted to a total volume of 10 ml, and used as a measurement sample. 7. The measurement sample is injected into a high performance liquid chromatograph having the following specifications, and the content of the low molecular weight component in the polystyrene resin foam layer is measured.
【００２４】高速液体クロマトグラフの仕様は次の通り
である。 測定装置 株式会社島津製作所製高速液体クロマトグ
ラフ 液送ポンプＬＣ−６Ａ（二台）、自動試料注入装置ＳＩ
Ｌ−６Ａ、紫外線分光光度計検出器ＳＰＤ−６Ａ、カラ
ムオーブンＣＴＯ−６Ａ、システムコントローラＳＣＬ
−６Ａ、データ処理装置Ｃ−Ｒ３ＡThe specifications of the high performance liquid chromatograph are as follows. Measuring device High-performance liquid chromatograph manufactured by Shimadzu Corporation Liquid sending pump LC-6A (two units), automatic sample injector SI
L-6A, ultraviolet spectrophotometer detector SPD-6A, column oven CTO-6A, system controller SCL
-6A, data processing device C-R3A
【００２５】測定条件 カラム 信和加工株式会社製 ＵＬＴＲＯＮ ＶＸ
−ＯＤＳ（充填材ＯＤＳシリカ、内径４．６ｍｍ、長さ
２５０ｍｍ、粒径５μｍ） カラム温度 ５０℃ 移動相 アセトニトリル：水（体積比６：４）を移
動相の初期濃度とし、測定試料注入直後からリニアグラ
ジエントを１３分間行なうことにより、アセトニトリル
のみの移動相とした後、更に２２分間溶出させた。 流速 １．５ｍｌ／ｍｉｎ 検出波長 ２２５ｎｍ 注入量 ５〜１００μｌの範囲で適宜選択する。 検量線 スチレン二量体及び三量体の標準試料（関東
化学株式会社製）を使用し、絶対検量線法により定量す
る。Measurement conditions Column ULTON VX manufactured by Shinwa Processing Co., Ltd.
-ODS (filler ODS silica, inner diameter 4.6 mm, length 250 mm, particle size 5 μm) Column temperature 50 ° C. Mobile phase Acetonitrile: water (volume ratio 6: 4) is used as the initial concentration of the mobile phase, and immediately after injection of the measurement sample. After performing a linear gradient for 13 minutes to obtain a mobile phase containing only acetonitrile, elution was further performed for 22 minutes. Flow rate 1.5 ml / min Detection wavelength 225 nm Injection amount 5 to 100 μl is appropriately selected. Calibration curve Using a standard sample of styrene dimer and trimer (manufactured by Kanto Chemical Co., Ltd.), quantification is performed by the absolute calibration curve method.
【００２６】本発明においては、大気泡径発泡層２，小
気泡径発泡層３の気泡径を調整するために気泡調整剤を
添加することが好ましい。該気泡調整剤としては、タル
ク、カオリン、マイカ、シリカ、炭酸カルシウム、硫酸
バリウム、酸化チタン、クレー、酸化アルミニウム、ベ
ントナイト、ケイソウ土等の無機物粉末、又は重炭酸ナ
トリウム、クエン酸モノナトリウム塩等が例示される。
これらの気泡調整剤は、通常は単独で使用されるが２種
以上組合せて用いてもよい。In the present invention, it is preferable to add a cell regulator to adjust the cell diameter of the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3. Examples of the cell regulator include talc, kaolin, mica, silica, calcium carbonate, barium sulfate, titanium oxide, clay, aluminum oxide, bentonite, diatomaceous earth, and other inorganic powders, or sodium bicarbonate, monosodium citrate, and the like. Is exemplified.
These foam control agents are usually used alone, but may be used in combination of two or more.
【００２７】上記無機物粉末は、粒子系が小さいほど発
泡層の気泡径を小さくする効果が大きいので、使用量が
少なくても気泡径を小さくすることができる。かかる観
点から無機物粉末の平均粒子径（遠心沈降法）は３０μ
ｍ以下であることが好ましく、２０μｍ以下であること
がより好ましく、１５μｍ以下であることが更に好まし
い。但し、平均粒子径が小さくなるほど加工に費用がか
かり、無機物粉末の価格が高くなるので、０．１μｍを
下限とすることが好ましい。上記無機物粉末の中でも、
タルクが気泡径を小さくする効果が大きいと共に安価な
ので最も好ましい。The smaller the particle size of the inorganic powder, the greater the effect of reducing the cell diameter of the foamed layer. Therefore, the cell diameter can be reduced even if the amount used is small. From this viewpoint, the average particle size (centrifugal sedimentation method) of the inorganic powder is 30 μm.
m, preferably 20 μm or less, and more preferably 15 μm or less. However, the smaller the average particle diameter, the higher the cost of processing and the higher the price of the inorganic powder, so the lower limit is preferably 0.1 μm. Among the above inorganic powders,
Talc is most preferable because it has a large effect of reducing the bubble diameter and is inexpensive.
【００２８】本発明の大気泡径発泡層発泡層２，小気泡
径発泡層３の形成に用いる発泡剤としては、プロパン、
ｎ−ブタン、ｉ−ブタン、ｎ−ブタンとｉ−ブタンとの
混合物、ペンタン、ヘキサン等の脂肪族炭化水素、シク
ロブタン、シクロペンタン等の環式脂肪族炭化水素、ト
リクロロフロロメタン、ジクロロジフロロメタン、１，
１−ジフルオロエタン、１，１−ジフルオロ−１−クロ
ロエタン、１，１，１，２−テトラフルオロエタン、メ
チルクロライド、エチルクロライド、メチレンクロライ
ド等のハロゲン化炭化水素およびこれらの混合物等の物
理発泡剤を使用することができる。The foaming agents used to form the foamed layer 2 having a large cell diameter and the foamed layer 3 having a small cell diameter according to the present invention include propane and propane.
n-butane, i-butane, a mixture of n-butane and i-butane, aliphatic hydrocarbons such as pentane and hexane, cycloaliphatic hydrocarbons such as cyclobutane and cyclopentane, trichlorofluoromethane, dichlorodifluoromethane , 1,
Physical blowing agents such as halogenated hydrocarbons such as 1-difluoroethane, 1,1-difluoro-1-chloroethane, 1,1,1,2-tetrafluoroethane, methyl chloride, ethyl chloride, and methylene chloride, and mixtures thereof. Can be used.
【００２９】又、本発明においては、アゾジカルボンア
ミド、ジニトロソペンタメチレンテトラミン、アゾビス
イソブチロニトリル、重炭酸ナトリウム等の分解型発泡
剤を使用したり、二酸化炭素等の無機ガスや水を使用す
ることもできる。更に、上記各種の発泡剤を適宜混合し
て用いることもできる。但し、オゾン層の破壊等環境へ
悪影響のを及ぼすことが少ないハロゲン化水素を含まな
いものを使用することが好ましい。In the present invention, a decomposable blowing agent such as azodicarbonamide, dinitrosopentamethylenetetramine, azobisisobutyronitrile, and sodium bicarbonate may be used, or an inorganic gas such as carbon dioxide or water may be used. Can also be used. Further, the above-mentioned various foaming agents may be appropriately mixed and used. However, it is preferable to use a material that does not contain hydrogen halide that does not adversely affect the environment such as destruction of the ozone layer.
【００３０】但し、上記発泡剤は特に限定されず、目標
とする発泡層の密度に対応して適宜選択することができ
る。However, the foaming agent is not particularly limited, and can be appropriately selected according to the target density of the foamed layer.
【００３１】本発明における大気泡径発泡層２の平均気
泡径Ｌ１は、１５０〜４５０μｍである。平均気泡径が
１５０μｍ未満の場合は、特に深絞り形状の成形を行う
と、破れや透孔が発生する虞がある。一方、平均気泡径
が４５０μｍを超える場合は、外観が悪くなり、断熱性
が低下する虞がある。The average cell diameter L1 of the large cell diameter foamed layer 2 in the present invention is 150 to 450 μm. When the average bubble diameter is less than 150 μm, there is a possibility that breakage or through-holes may occur, particularly when deep drawing is performed. On the other hand, when the average bubble diameter exceeds 450 μm, the appearance is deteriorated, and the heat insulating property may be reduced.
【００３２】本発明における小気泡径発泡層３の平均気
泡径Ｌ２は３５〜１８０μｍである。平均気泡径Ｌ２が
３５μｍ未満の場合は、小気泡径発泡層３の露出してい
る側の表面に後述する熱可塑性樹脂層５を積層した場
合、熱成形の際に熱可塑性樹脂層５と小気泡径発泡層３
との界面において、小気泡径発泡層３に破れや透孔が発
生する虞がある。一方、平均気泡径が１８０μｍを超え
る場合は、小気泡径発泡層３の表面が凹凸状になるの
で、表面平滑性が悪くなる。又、小気泡径発泡層３に積
層された上記熱可塑性樹脂層５の表面平滑性が悪くな
り、熱成形によって得られる容器の熱可塑性樹脂層５へ
の印刷性が低下する虞がある。The average cell diameter L2 of the small cell diameter foam layer 3 in the present invention is 35 to 180 μm. When the average cell diameter L2 is less than 35 μm, when a thermoplastic resin layer 5 to be described later is laminated on the exposed surface of the small cell diameter foamed layer 3, when the thermoplastic resin layer 5 is small during thermoforming, Bubble diameter foam layer 3
There is a risk that the small-bubble-diameter foamed layer 3 may be broken or a hole may be formed at the interface with the bubble. On the other hand, when the average cell diameter exceeds 180 μm, the surface of the small cell diameter foam layer 3 becomes uneven, so that the surface smoothness deteriorates. In addition, the surface smoothness of the thermoplastic resin layer 5 laminated on the small-cell-diameter foam layer 3 may be deteriorated, and the printability of the container obtained by thermoforming on the thermoplastic resin layer 5 may be reduced.
【００３３】本発明においては、大気泡径発泡層２の平
均気泡径L１は常に小気泡径発泡層３の平均気泡径L２よ
り大きい（平均気泡径L１＞平均気泡径L２）。平均気泡
径L１が平均気泡径L２と等しい場合又は平均気泡径L１
が平均気泡径L２より小さい場合は、深絞り形状の成形
を行うと大気泡径発泡層２において、破れや透孔が発生
する虞がある。又小気泡径発泡層３の表面が凹凸状にな
り表面平滑性が悪くなるので、熱成形によって得られる
容器の熱可塑性樹脂層５に美麗な印刷ができなくなる虞
がある。In the present invention, the average cell diameter L1 of the large cell diameter foam layer 2 is always larger than the average cell diameter L2 of the small cell diameter foam layer 3 (average cell diameter L1> average cell diameter L2). When the average cell diameter L1 is equal to the average cell diameter L2 or the average cell diameter L1
Is smaller than the average cell diameter L2, deep foaming may cause breakage and / or pores in the large cell diameter foamed layer 2. In addition, since the surface of the small-cell-diameter foam layer 3 becomes uneven and the surface smoothness deteriorates, there is a possibility that beautiful printing cannot be performed on the thermoplastic resin layer 5 of the container obtained by thermoforming.
【００３４】上記平均気泡径は、つぎのように求める。
積層発泡シート１における押出方向に対して垂直な断
面、即ち押出方向と直交する幅方向と厚さ方向で定まる
面を顕微鏡で撮影し、各々の断面写真について大気泡径
発泡層２の厚さｔ３及び小気泡径発泡層３の厚さｔ４を
測定する。次に、各断面写真の厚さ方向に直線ｌを引
き、直線ｌと交わる大気泡径発泡層２における全ての気
泡の数ｎ３、及び直線ｌと交わる小気泡径発泡層３にお
ける全ての気泡の数ｎ４を数える。The average bubble diameter is determined as follows.
A cross section of the laminated foam sheet 1 perpendicular to the extrusion direction, that is, a surface defined by a width direction and a thickness direction orthogonal to the extrusion direction is photographed with a microscope, and the thickness t3 of the large-cell-diameter foam layer 2 for each cross-sectional photograph is taken. And the thickness t4 of the small-cell-diameter foam layer 3 is measured. Next, a straight line 1 is drawn in the thickness direction of each cross-sectional photograph, and the number n3 of all the bubbles in the large-cell-diameter foam layer 2 intersecting with the straight line l and the number n3 of all the bubbles in the small-cell-diameter foam layer 3 intersecting with the straight line l Count the number n4.
【００３５】このようにして得られたｔ３とｎ３から各
断面写真について大気泡径発泡層２の気泡径（ｔ３／ｎ
３）を計算し、又ｔ４とｎ４とから各断面写真について
小気泡径発泡層３の気泡径（ｔ４／ｎ４）を計算する。
このように大気泡径発泡層２の気泡径と小気泡径発泡層
３の気泡径を測定し、前者の平均値を大気泡径発泡層２
の平均気泡径とし、後者の平均値を小気泡径発泡層３の
平均気泡径とする。From the thus obtained t3 and n3, for each cross-sectional photograph, the cell diameter (t3 / n)
3) is calculated, and the cell diameter (t4 / n4) of the small cell diameter foam layer 3 is calculated for each cross-sectional photograph from t4 and n4.
In this way, the cell diameter of the large-cell-diameter foam layer 2 and the cell diameter of the small-cell-diameter foam layer 3 are measured.
And the average value of the latter is defined as the average cell diameter of the small-cell-diameter foam layer 3.
【００３６】大気泡径発泡層２の表面気泡数は、１５〜
１１５個／４ｍｍ2であることが好ましい。表面気泡数
が１５個／４ｍｍ2未満の場合は、断熱性が低下する虞
があり、表面気泡数が１１５個／４ｍｍ2を超える場合
は、深絞り形状の成形を行うと、破れや透孔が発生する
虞がある。The number of cells on the surface of the large-cell-diameter foam layer 2 is 15 to
It is preferably 115 pieces / 4 mm 2 . When the number of surface bubbles is less than 15/4 mm 2 , the heat insulating property may be reduced. When the number of surface bubbles exceeds 115/4 mm 2 , when a deep drawing shape is formed, tearing or perforation may occur. May occur.
【００３７】上記小気泡径発泡層３の表面気泡数は、１
２０〜５００個／４ｍｍ2であることが好ましい。表面
の気泡数が１２０個／４ｍｍ2未満の場合は、熱可塑性
樹脂層５の表面平滑性がなくなって印刷性が悪くなる虞
がある。一方、表面の気泡数が５００個／４ｍｍ2を超
えると、連続気泡率が増大して熱成形する際の二次発泡
が悪くなる虞がある。The number of bubbles on the surface of the small-cell-diameter foam layer 3 is 1
It is preferably 20 to 500 pieces / 4 mm 2 . If the number of bubbles on the surface is less than 120/4 mm 2 , there is a possibility that the surface smoothness of the thermoplastic resin layer 5 is lost and the printability is deteriorated. On the other hand, if the number of cells on the surface exceeds 500/4 mm 2 , the ratio of open cells may increase and secondary foaming during thermoforming may be deteriorated.
【００３８】上記表面気泡数の測定は、顕微鏡（株式会
社キーエンス製デジタルＨＤマイクロスコープＶＨ−７
００）を用いて、発泡層の表面をテレビ画面上に拡大し
て写し、該拡大された画面上において実際の試料面積４
ｍｍ2に相当する面積内の気泡径の数を測定する。具体
的には、後述する方法によって作製した縦２ｍｍ以上、
横２ｍｍ以上の測定試料を、顕微鏡の試料台に発泡層の
表面がテレビ画面に写し出されるように水平に置き、拡
大倍率１００倍（面積の拡大倍率で１００００倍）に拡
大して、テレビ画面上において４００ｃｍ2（実際の試
料面積４ｍｍ2に相当する）範囲内の気泡数を測定す
る。The measurement of the number of bubbles on the surface is performed by using a microscope (Digital HD microscope VH-7 manufactured by Keyence Corporation).
00), the surface of the foam layer is enlarged and photographed on a television screen, and the actual sample area 4
The number of bubble diameters in the area corresponding to mm 2 is measured. Specifically, a vertical length of 2 mm or more produced by a method described below,
A measurement sample having a width of 2 mm or more is placed horizontally on a sample stage of a microscope such that the surface of the foamed layer is projected on the television screen, and is enlarged to 100 times (magnification of area is 10,000 times). The number of bubbles in the range of 400 cm 2 (corresponding to an actual sample area of 4 mm 2 ) is measured.
【００３９】本明細書における小気泡径発泡層３に熱可
塑性樹脂層が積層されていない場合の表面気泡数の測定
においては、小気泡径発泡層３の表面を基準として切出
した厚さ５０μｍの試験片を使用する。一方、小気泡径
発泡層３に熱可塑性樹脂層が積層されている場合の表面
気泡数の測定においては、熱可塑性樹脂層の外側表面を
基準として、該表面から熱可塑性樹脂層の厚さに５０μ
ｍを加えた厚さに試験片を切出す。熱可塑性樹脂層の厚
さは、予め顕微鏡を用いて撮影した積層発泡シートの断
面写真から求める。In the measurement of the number of surface bubbles in the case where the thermoplastic resin layer is not laminated on the small-cell-diameter foam layer 3 in the present specification, the thickness of the 50 μm-thick cut-out sheet based on the surface of the small-cell-diameter foam layer 3 is determined. Use test specimens. On the other hand, in the measurement of the number of surface bubbles when the thermoplastic resin layer is laminated on the small-cell-diameter foamed layer 3, the thickness of the thermoplastic resin layer is measured from the outer surface of the thermoplastic resin layer with reference to the outer surface. 50μ
A test piece is cut out to a thickness to which m has been added. The thickness of the thermoplastic resin layer is determined from a cross-sectional photograph of the laminated foamed sheet taken in advance using a microscope.
【００４０】上記表面気泡数の測定においては、テレビ
画面上の２０ｃｍ各の正方形の内側を残してその周囲を
マスキングテープ等で貼り、該正方形の内部に存在する
気泡数を数える。尚、上記正方形の境界線上に気泡が存
在している場合は、相対する一の辺を跨っている気泡は
測定の対象とするが、相対する他の辺を跨っている気泡
は測定の対象としない。In the measurement of the number of bubbles on the surface, the inside of each square of 20 cm on the television screen is left around with a masking tape or the like, and the number of bubbles existing inside the square is counted. When bubbles are present on the boundary of the square, bubbles that straddle one opposite side are to be measured, but bubbles that straddle the other opposite side are to be measured. do not do.
【００４１】大気泡径発泡層２の密度は、５０〜７００
ｋｇ／ｍ3であることが好ましい。軽量であって断熱性
に優れているという観点からは、該密度は７０ｋｇ／ｍ
3〜３５０ｋｇ／ｍ3であることがより好ましい。更に、
軽量性と経済性に優れているという観点からは、該密度
は７０ｋｇ／ｍ3〜１５０ｋｇ／ｍ3であることが好まし
い。大気泡径発泡層２の密度が、５０ｋｇ／ｍ3未満の
場合は、熱成形を行なう際に、大気泡径発泡層２の伸び
不足により得られる容器に透孔が発生する虞や、得られ
る容器の剛性が小さくなって容器としての機能が低下す
る虞がある。一方、該密度が７００ｋｇ／ｍ3を超える
場合は、熱成形によって得られた容器の断熱性が低下し
たり、衝撃を受けると割れやすくなったり、経済性が低
下する虞がある。The density of the large-cell-diameter foam layer 2 is 50 to 700.
It is preferably kg / m 3 . From the viewpoint of light weight and excellent heat insulation, the density is 70 kg / m
More preferably, it is 3 to 350 kg / m 3 . Furthermore,
From the viewpoint of excellent light weight and economy, it is preferred that said seal size is 70kg / m 3 ~150kg / m 3 . When the density of the large-cell-diameter foamed layer 2 is less than 50 kg / m 3 , there is a risk that through-holes may be generated in a container obtained due to insufficient elongation of the large-cell-diameter foamed layer 2 during thermoforming. There is a possibility that the rigidity of the container is reduced and the function as the container is reduced. On the other hand, if the density exceeds 700 kg / m 3 , the heat insulation of the container obtained by thermoforming may be reduced, or the container may be easily broken when subjected to an impact, and economical efficiency may be reduced.
【００４２】小気泡径発泡層３の密度は、５０〜７００
ｋｇ／ｍ3であることが好ましい。軽量であって断熱性
に優れているという観点からは、該密度は７０ｋｇ／ｍ
3〜３５０ｋｇ／ｍ3であることがより好ましい。更に、
軽量性と経済性に優れているという観点からは、該密度
は７０ｋｇ／ｍ3〜１５０ｋｇ／ｍ3であることが好まし
い。小気泡径発泡層３の密度が、５０ｋｇ／ｍ3未満の
場合は、熱成形を行なう際に、小気泡径発泡層３の伸び
不足により得られる容器に透孔が発生する虞や、得られ
る容器の剛性が小さくなって容器としての機能が低下す
る虞がある。一方、該密度が７００ｋｇ／ｍ3を超える
場合は、熱成形によって得られた容器の断熱性が低下し
たり、衝撃を受けると割れやすくなったり、経済性が低
下する虞がある。The density of the foam layer 3 having a small cell diameter is 50 to 700.
It is preferably kg / m 3 . From the viewpoint of light weight and excellent heat insulation, the density is 70 kg / m
More preferably, it is 3 to 350 kg / m 3 . Furthermore,
From the viewpoint of excellent light weight and economy, it is preferred that said seal size is 70kg / m 3 ~150kg / m 3 . When the density of the small-cell-diameter foam layer 3 is less than 50 kg / m 3 , there is a possibility that through-holes may be generated in a container obtained due to insufficient elongation of the small-cell-diameter foam layer 3 when performing thermoforming, or the obtained foam may be obtained. There is a possibility that the rigidity of the container is reduced and the function as the container is reduced. On the other hand, if the density exceeds 700 kg / m 3 , the heat insulation of the container obtained by thermoforming may be reduced, or the container may be easily broken when subjected to an impact, and economical efficiency may be reduced.
【００４３】大気泡径発泡層２の密度が小気泡径発泡層
３の密度と同じ場合、熱成形する際の加熱ムラが発生し
ない。大気泡径発泡層２の密度が小気泡径発泡層３の密
度より大きい場合、熱成形する際、更に破れや透孔がよ
り発生しなくなる。逆に、大気泡径発泡層２の密度が小
気泡径発泡層３の密度より小さい場合、熱成形する際の
金型再現性が更に向上する。When the density of the large-cell-diameter foam layer 2 is the same as the density of the small-cell-diameter foam layer 3, no uneven heating occurs during thermoforming. When the density of the large-cell-diameter foam layer 2 is higher than the density of the small-cell-diameter foam layer 3, further breakage and pores do not occur during thermoforming. Conversely, when the density of the large-cell-diameter foam layer 2 is smaller than the density of the small-cell-diameter foam layer 3, the mold reproducibility during thermoforming is further improved.
【００４４】本明細書における大気泡径発泡層２の密度
及び小気泡径発泡層３の密度の測定は、小気泡径発泡層
３に熱可塑性樹脂層５が積層されていない場合と、小気
泡径発泡層３に熱可塑性樹脂層５が積層されている場合
で異なり、それぞれ次のように求める。In this specification, the density of the large-cell-diameter foamed layer 2 and the density of the small-cell-diameter foamed layer 3 are measured when the thermoplastic resin layer 5 is not laminated on the small-cell-diameter foamed layer 3. It differs depending on the case where the thermoplastic resin layer 5 is laminated on the radial foam layer 3 and is determined as follows.
【００４５】小気泡径発泡層３に熱可塑性樹脂層５が積
層されていない場合、小気泡径発泡層３の密度は、積層
発泡シート１より切取った試験片を熱可塑性樹脂補強層
４と大気泡径発泡層２との界面に可能な限り近い位置に
至るまで複数回に分けて平面状に大気泡径発泡層２を切
取り、試験片の熱可塑性樹脂補強層４に大気泡径発泡層
２が多量に付着している場合は、大気泡径発泡層２のみ
を切取ってから、小気泡径発泡層３の重量と熱可塑性樹
脂補強層４の重量との合計の重量を測定する。次に、切
取り後の試験片の厚さ方向断面を顕微鏡で撮影し、その
断面写真より、熱可塑性樹脂補強層４の厚さ、小気泡径
発泡層３の厚さを測定する。When the thermoplastic resin layer 5 is not laminated on the small-cell-diameter foamed layer 3, the density of the small-cell-diameter foamed layer 3 is determined by cutting a test piece cut from the laminated foam sheet 1 with the thermoplastic resin reinforcing layer 4. The large-cell-diameter foamed layer 2 is cut out in a plurality of times into a planar shape until reaching a position as close as possible to the interface with the large-cell-diameter foamed layer 2, and the large-cell-diameter foamed layer is added to the thermoplastic resin reinforcing layer 4 of the test piece. If a large amount of 2 is adhered, only the large-cell-diameter foam layer 2 is cut off, and then the total weight of the weight of the small-cell-diameter foam layer 3 and the weight of the thermoplastic resin reinforcing layer 4 is measured. Next, a cross section in the thickness direction of the test piece after cutting is photographed with a microscope, and the thickness of the thermoplastic resin reinforcing layer 4 and the thickness of the small-cell-diameter foam layer 3 are measured from the cross-sectional photograph.
【００４６】次に、上記熱可塑性樹脂補強層４の厚さ、
試験片の平面部分の面積、熱可塑性樹脂補強層４を構成
する基材樹脂の密度より熱可塑性樹脂補強層４の重量を
計算する。次に、小気泡径発泡層３と熱可塑性樹脂補強
層４の合計の重量から計算によって求めた熱可塑性樹脂
補強層４の重量を引いた値を小気泡径発泡層３の重量ｗ
３（ｇ）とする。上記小気泡径発泡層３の厚さ、試験片
の平面部分面積、小気泡径発泡層３の重量より小気泡径
発泡層３の密度を計算する。尚、大気泡径発泡層２の密
度の測定は、小気泡径発泡層３を前述したように切取っ
て取除いた以外は小気泡径発泡層３の密度の測定と同様
に行なう。Next, the thickness of the thermoplastic resin reinforcing layer 4
The weight of the thermoplastic resin reinforcing layer 4 is calculated based on the area of the plane portion of the test piece and the density of the base resin constituting the thermoplastic resin reinforcing layer 4. Next, the value obtained by subtracting the weight of the thermoplastic resin reinforcing layer 4 calculated from the total weight of the small cell diameter foamed layer 3 and the thermoplastic resin reinforcing layer 4 is used as the weight w of the small cell diameter foamed layer 3.
3 (g). The density of the small-cell-diameter foam layer 3 is calculated from the thickness of the small-cell-diameter foam layer 3, the plane area of the test piece, and the weight of the small-cell-diameter foam layer 3. The measurement of the density of the large-cell-diameter foam layer 2 is performed in the same manner as the measurement of the density of the small-cell-diameter foam layer 3 except that the small-cell-diameter foam layer 3 is cut off and removed as described above.
【００４７】小気泡径発泡層３に熱可塑性樹脂層５が積
層されている場合、小気泡径発泡層３の密度は、大気泡
径発泡層２を切取り後の試験片、即ち、熱可塑性樹脂補
強層４、小気泡径発泡層３、熱可塑性樹脂層５が積層さ
れた試験片の重量から、上記計算により求めた熱可塑性
樹脂補強層４の重量と、同様に基材樹脂の密度を使用し
て計算により求めた熱可塑性樹脂層５の重量を引いて、
小気泡径発泡層３の重量とし、小気泡径発泡層３の厚
さ、試験片の平面部分面積、小気泡径発泡層３の重量よ
り小気泡径発泡層３の密度を計算する。尚、大気泡径発
泡層２の密度の測定は、小気泡径発泡層３と熱可塑性樹
脂層５を取除くこと以外は、小気泡径発泡層３の密度の
測定と同様に行なう。When the thermoplastic resin layer 5 is laminated on the small-cell-diameter foam layer 3, the density of the small-cell-diameter foam layer 3 is determined by the test piece after the large-cell-diameter foam layer 2 is cut off, ie, the thermoplastic resin. Using the weight of the thermoplastic resin reinforcing layer 4 calculated by the above calculation from the weight of the test piece on which the reinforcing layer 4, the small cell diameter foaming layer 3, and the thermoplastic resin layer 5 are laminated, the density of the base resin is similarly used. Then, subtract the weight of the thermoplastic resin layer 5 obtained by calculation,
The density of the small-cell-diameter foam layer 3 is calculated from the thickness of the small-cell-diameter foam layer 3, the thickness of the small-cell-diameter foam layer 3, the plane area of the test piece, and the weight of the small-cell-diameter foam layer 3. The measurement of the density of the large-cell-diameter foam layer 2 is performed in the same manner as the measurement of the density of the small-cell-diameter foam layer 3 except that the small-cell-diameter foam layer 3 and the thermoplastic resin layer 5 are removed.
【００４８】本明細書において、大気泡径発泡層２と小
気泡径発泡層３の密度は、上記方法によって測定し、ｋ
ｇ／ｍ3単位で小数点以下１桁目を四捨五入して求める
こととする。In the present specification, the densities of the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 are measured by the above-described method.
It is determined by rounding off the first digit after the decimal point in g / m 3 units.
【００４９】本発明における大気泡径発泡層２の厚さ
は、０．２〜３ｍｍが好ましく、０．２５〜２ｍｍがよ
り好ましく、０．３ｍｍ以上１．２ｍｍ未満がとくに好
ましい。該厚さが０．２ｍｍ未満の場合は、積層発泡シ
ートを熱成形して得られる容器の強度や断熱性が低下す
る虞がある。３ｍｍを超える場合は、積層発泡シートを
熱成形する際に加熱ムラが発生しやすく、金型の形状を
再現した容器を得ることができない虞がある。The thickness of the large-diameter foam layer 2 in the present invention is preferably from 0.2 to 3 mm, more preferably from 0.25 to 2 mm, particularly preferably from 0.3 mm to less than 1.2 mm. If the thickness is less than 0.2 mm, the strength and heat insulation of the container obtained by thermoforming the laminated foam sheet may be reduced. When the thickness exceeds 3 mm, uneven heating tends to occur when the laminated foamed sheet is thermoformed, and there is a possibility that a container that reproduces the shape of the mold cannot be obtained.
【００５０】一方、小気泡径発泡層３の厚さは、０．２
〜３ｍｍが好ましく、０．２５〜２ｍｍがより好まし
く、０．３ｍｍ以上１．２ｍｍ未満がとくに好ましい。
０．２ｍｍ未満の場合は、積層発泡シートを熱成形して
得られる容器のの強度や断熱性、印刷性が低下する虞が
ある。３ｍｍを超える場合は、積層発泡シートを熱成形
する際に加熱ムラが発生しやすく、金型の形状を再現し
た容器を得ることができない虞がある。On the other hand, the thickness of the small-cell-diameter foam layer 3 is 0.2
3 mm is preferable, 0.25 to 2 mm is more preferable, and 0.3 mm or more and less than 1.2 mm is particularly preferable.
If it is less than 0.2 mm, the strength, heat insulation and printability of the container obtained by thermoforming the laminated foam sheet may be reduced. When the thickness exceeds 3 mm, uneven heating tends to occur when the laminated foamed sheet is thermoformed, and there is a possibility that a container that reproduces the shape of the mold cannot be obtained.
【００５１】本明細書における上記積層発泡シート１の
厚さ、後述する熱可塑性樹脂補強層４、後述する熱可塑
性樹脂層５の厚さ、大気泡径発泡層２の厚さ、小気泡径
発泡層３の厚さは、積層発泡シート１の厚さ方向断面を
顕微鏡で撮影し、その断面写真より求めるものとする。In the present specification, the thickness of the laminated foamed sheet 1, the thickness of the thermoplastic resin reinforcing layer 4 described later, the thickness of the thermoplastic resin layer 5 described later, the thickness of the large foamed foam layer 2, and the small foamed foam The thickness of the layer 3 is determined by taking a cross section of the laminated foamed sheet 1 in the thickness direction with a microscope and obtaining a photograph of the cross section.
【００５２】本発明の大気泡径発泡層２，小気泡径発泡
層３各々の連続気泡率は、４０％以下であることが好ま
しく、３０％以下であることがより好ましく、２０％以
下であることが特に好ましい。該連続気泡率が、４０％
を超えると、熱成形時の二次発泡性や得られる容器の強
度等の物性が悪くなる虞がある。The open cell ratio of each of the large cell diameter foam layer 2 and the small cell diameter foam layer 3 of the present invention is preferably 40% or less, more preferably 30% or less, and more preferably 20% or less. Is particularly preferred. The open cell rate is 40%
If it exceeds 300, physical properties such as secondary foamability during thermoforming and the strength of the obtained container may be deteriorated.
【００５３】上記発泡シートの連続気泡率の測定は、Ａ
ＳＴＭ Ｄ２８５６の手順Ｃに準拠して行う。The measurement of the open cell ratio of the foamed sheet was carried out using A
Performed according to procedure C of STM D2856.
【００５４】尚、連続気泡率の測定に用いる大気泡径発
泡層２，小気泡径発泡層３の体積は、測定試料全体の体
積から熱可塑性樹脂補強層４の体積を除いた値とする。
前記熱可塑性樹脂補強層４の体積は、熱可塑性樹脂補強
層４の厚さと測定試料の面積から算出する。熱可塑性樹
脂補強層４の厚さは前記の顕微鏡を使用する方法で求め
た値を用いるものとする。The volumes of the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 used for measuring the open-cell rate are values obtained by subtracting the volume of the thermoplastic resin reinforcing layer 4 from the volume of the entire measurement sample.
The volume of the thermoplastic resin reinforcing layer 4 is calculated from the thickness of the thermoplastic resin reinforcing layer 4 and the area of the measurement sample. The thickness of the thermoplastic resin reinforcing layer 4 uses a value obtained by the method using a microscope described above.
【００５５】本発明の積層発泡シートにおいては、熱可
塑性樹脂補強層４が大気泡径発泡層２と小気泡径発泡層
３との間に設けられている。該補強層が設けられている
ことにより、本発明の熱可塑性樹脂積層発泡シートは、
外観が従来のポリスチレン系樹脂発泡シートと同様であ
っても、従来の製造方法では実現することができなかっ
た曲げ強度を有する。In the laminated foam sheet of the present invention, the thermoplastic resin reinforcing layer 4 is provided between the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3. By the provision of the reinforcing layer, the thermoplastic resin laminated foam sheet of the present invention,
Even if the appearance is similar to that of a conventional polystyrene-based resin foam sheet, it has a bending strength that cannot be realized by a conventional manufacturing method.
【００５６】熱可塑性樹脂補強層４に用いられる樹脂と
しては、ポリ塩化ビニル等の塩化ビニル系樹脂、前述し
た大気泡径発泡層２及び小気泡径発泡層３を構成する基
材樹脂と同様なポリスチレン等のポリスチレン系樹脂、
低密度ポリエチレン、高密度ポリエチレン、直鎖状低密
度ポリエチレン等のポリエチレン系樹脂、プロピレン−
エチレンランダム共重合体、プロピレン−エチレンブロ
ック共重合体、プロピレン−ブテンランダム共重合体、
プロピレン−エチレン−ブテンランダム共重合体、ポリ
プロピレン系樹脂等のポリオレフィン系樹脂、ポリメチ
ルメタクリレート等のアクリル系樹脂、ポリカーボネー
ト系樹脂、ポリエチレンテレフタレート等のポリエステ
ル系樹脂、及びこれらの樹脂の混合物が挙げられる。The resin used for the thermoplastic resin reinforcing layer 4 is a vinyl chloride resin such as polyvinyl chloride, and the same as the base resin constituting the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 described above. Polystyrene resin such as polystyrene,
Polyethylene resins such as low-density polyethylene, high-density polyethylene, linear low-density polyethylene, propylene
Ethylene random copolymer, propylene-ethylene block copolymer, propylene-butene random copolymer,
Examples include polyolefin resins such as propylene-ethylene-butene random copolymer and polypropylene resin, acrylic resins such as polymethyl methacrylate, polycarbonate resins, polyester resins such as polyethylene terephthalate, and mixtures of these resins.
【００５７】上記各種の樹脂の中でも、大気泡径発泡層
２，小気泡径発泡層３との接着性の点から、大気泡径発
泡層２，小気泡径発泡層３の基材樹脂と同様のポリスチ
レン系樹脂を使用することが好ましい。尚、前記ポリス
チレン系樹脂の中でも、熱成形性の点から耐衝撃性ポリ
スチレン系樹脂が好ましい。Among the above various resins, the same as the base resin of the large-cell-diameter foamed layer 2 and the small-cell-diameter foamed layer 3 in terms of adhesiveness to the large-cell-diameter foamed layer 2 and the small-cell-diameter foamed layer 3 It is preferable to use a polystyrene resin. Incidentally, among the polystyrene resins, an impact-resistant polystyrene resin is preferable from the viewpoint of thermoformability.
【００５８】上記熱可塑性樹脂補強層４には、本発明の
目的を著しく損なわない範囲で、必要に応じて各種の添
加剤、例えば、造核剤、酸化防止剤、熱安定剤、帯電防
止剤、導電性付与剤、耐候剤、紫外線吸収剤、難燃剤、
無機充填剤等を添加することができる。In the thermoplastic resin reinforcing layer 4, various additives such as a nucleating agent, an antioxidant, a heat stabilizer, and an antistatic agent may be added to the thermoplastic resin reinforcing layer 4 as long as the object of the present invention is not significantly impaired. , Conductivity imparting agent, weathering agent, ultraviolet absorber, flame retardant,
Inorganic fillers and the like can be added.
【００５９】熱可塑性樹脂補強層４は、密度８００ｋｇ
／ｍ3以上であることが好ましく、密度８００ｋｇ／ｍ3
以上のポリスチレン系樹脂であることがより好ましく、
密度９００ｋｇ／ｍ3以上のポリスチレン系樹脂である
ことが更に好ましく、経済性及び作業性に優れている観
点から密度１０５０ｋｇ／ｍ3のポリスチレン系樹脂、
即ち非発泡のポリスチレン系樹脂であることが特に好ま
しい。The thermoplastic resin reinforcing layer 4 has a density of 800 kg.
/ M 3 or more, and a density of 800 kg / m 3
More preferably the above polystyrene resin,
A polystyrene resin having a density of 900 kg / m 3 or more is more preferable, and a polystyrene resin having a density of 1050 kg / m 3 from the viewpoint of excellent economic efficiency and workability.
That is, a non-foamed polystyrene resin is particularly preferable.
【００６０】熱可塑性樹脂補強層４が、密度８００ｋｇ
／ｍ3未満の場合は、積層発泡シートの強度を補強でき
ない虞がある。又、熱可塑性樹脂補強層４としてポリス
チレン系樹脂以外の樹脂を使用すると、熱可塑性樹脂補
強層４と大気泡径発泡層２とを又は熱可塑性樹脂補強層
４と小気泡径発泡層３とを良好に接着できない虞があ
る。かかる場合は、熱可塑性樹脂補強層４と大気泡径発
泡層２，小気泡径発泡層３との間に接着層を設ける方法
を採用すれば、接着することはできるが高価なものとな
る虞がある。The thermoplastic resin reinforcing layer 4 has a density of 800 kg
If it is less than / m 3, the strength of the laminated foam sheet may not be reinforced. When a resin other than a polystyrene resin is used as the thermoplastic resin reinforcing layer 4, the thermoplastic resin reinforcing layer 4 and the large-cell-diameter foamed layer 2 or the thermoplastic-resin-reinforced layer 4 and the small-cell-diameter foamed layer 3 can be combined. There is a risk that good adhesion cannot be achieved. In such a case, if a method of providing an adhesive layer between the thermoplastic resin reinforcing layer 4 and the large-cell-diameter foamed layer 2 and the small-cell-diameter foamed layer 3 is employed, the bonding can be performed but the cost may be high. There is.
【００６１】熱可塑性樹脂補強層４の厚さは特に制限は
ないが、１０〜５００μｍであることが好ましく、３０
〜３００μｍであることがより好ましい。熱可塑性樹脂
補強層４の厚さが１０μｍ未満の場合は、充分な強度を
有する積層発泡シート、容器が得られない虞がある。一
方、５００μｍを超える場合は、熱成形する際の加熱条
件が狭く良好な容器が得られない虞がある。The thickness of the thermoplastic resin reinforcing layer 4 is not particularly limited, but is preferably from 10 to 500 μm.
It is more preferable that the thickness be 300 μm. If the thickness of the thermoplastic resin reinforcing layer 4 is less than 10 μm, there is a possibility that a laminated foamed sheet or container having sufficient strength may not be obtained. On the other hand, if it exceeds 500 μm, there is a possibility that the heating conditions during thermoforming are narrow and a good container cannot be obtained.
【００６２】本発明においては、図２に示すように、小
気泡径発泡層３の表面に最外層を構成する熱可塑性樹脂
層５が設けられていることが好ましい。このように構成
すると本発明の積層発泡シートの強度、特に剛性を更に
向上させることができる。又、深絞り成形性や熱可塑性
樹脂層５の表面平滑性も向上する。更に、後述するよう
に、該熱可塑性樹脂層５を小気泡径層３に積層し、外面
側に位置するように熱成形された容器は、表面が平滑に
なって印刷性が良好なものとなる。In the present invention, as shown in FIG. 2, it is preferable that a thermoplastic resin layer 5 constituting the outermost layer is provided on the surface of the small-cell-diameter foam layer 3. With such a configuration, the strength, particularly the rigidity, of the laminated foamed sheet of the present invention can be further improved. Further, the deep drawability and the surface smoothness of the thermoplastic resin layer 5 are also improved. Further, as described later, a container formed by laminating the thermoplastic resin layer 5 on the small cell diameter layer 3 and thermoforming so as to be located on the outer surface side has a smooth surface and good printability. Become.
【００６３】該熱可塑性樹脂層５に用いられる樹脂とし
ては、ポリ塩化ビニル等の塩化ビニル系樹脂、前述した
大気泡径発泡層２及び小気泡径発泡層３を構成する基材
樹脂と同様なポリスチレン等のポリスチレン系樹脂、低
密度ポリエチレン、高密度ポリエチレン、直鎖状低密度
ポリエチレン等のポリエチレン系樹脂、プロピレン単独
重合体、プロピレン−エチレンランダム共重合体、プロ
ピレン−エチレンブロック共重合体、プロピレン−ブテ
ンランダム共重合体、プロピレン−エチレン−ブテンラ
ンダム共重合体、ポリプロピレン系樹脂等のポリオレフ
ィン系樹脂、ポリメチルメタクリレート等のアクリル系
樹脂、ポリカーボネート系樹脂、ポリエチレンテレフタ
レート等のポリエステル系樹脂、及びこれらの樹脂の混
合物が挙げられる。The resin used for the thermoplastic resin layer 5 is the same as the vinyl chloride resin such as polyvinyl chloride, and the same as the base resin constituting the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 described above. Polystyrene resins such as polystyrene, low density polyethylene, high density polyethylene, polyethylene resins such as linear low density polyethylene, propylene homopolymer, propylene-ethylene random copolymer, propylene-ethylene block copolymer, propylene- Butene random copolymer, propylene-ethylene-butene random copolymer, polyolefin resin such as polypropylene resin, acrylic resin such as polymethyl methacrylate, polycarbonate resin, polyester resin such as polyethylene terephthalate, and these resins Mixtures of
【００６４】上記各種の樹脂の中でも、小気泡径発泡層
３との接着性、熱成形性、印刷性の点から、小気泡径発
泡層３の基材樹脂と同様のポリスチレン系樹脂を使用す
ることが好ましく、柔軟性があって取り扱いやすい点
で、耐衝撃性ポリスチレン系樹脂がより好ましい。Among the above-mentioned various resins, the same polystyrene resin as the base resin of the small-cell-diameter foam layer 3 is used from the viewpoint of adhesion to the small-cell-diameter foam layer 3, thermoformability, and printability. It is preferable to use an impact-resistant polystyrene resin because it is flexible and easy to handle.
【００６５】尚、上記熱可塑性樹脂層５には、本発明の
目的を著しく損なわない範囲で、必要に応じて各種の添
加剤、例えば、造核剤、酸化防止剤、熱安定剤、帯電防
止剤、導電性付与剤、耐候剤、紫外線吸収剤、難燃剤、
無機充填剤等を添加することができる。In the thermoplastic resin layer 5, various additives such as a nucleating agent, an antioxidant, a heat stabilizer, an antistatic agent and the like may be added to the thermoplastic resin layer 5 as long as the object of the present invention is not significantly impaired. Agents, conductivity-imparting agents, weathering agents, ultraviolet absorbers, flame retardants,
Inorganic fillers and the like can be added.
【００６６】熱可塑性樹脂層５は少なくとも一層の樹脂
層からなり、上記各種の樹脂の中から同種又は異なる種
類の樹脂を選択し、複数の層からなる樹脂層として構成
することもできる。The thermoplastic resin layer 5 is composed of at least one resin layer, and the same or different types of resins can be selected from the above-mentioned various resins, and can be constituted as a resin layer composed of a plurality of layers.
【００６７】熱可塑性樹脂層５の厚さは、１０〜５００
μｍが好ましく、５０〜３００μｍがより好ましい。該
熱可塑性樹脂層５の厚さが１０μｍ未満の場合は、熱成
形する際に破れや透孔が発生する虞があり、熱成形によ
って得られた容器の開口部等の剛性が低下する虞もあ
る。一方、５００μｍを超える場合は、加熱時間を長く
しなければならないので、小気泡径発泡層３の表面が加
熱されすぎて凹凸が発生して外観不良になる虞がある。The thickness of the thermoplastic resin layer 5 is 10 to 500
μm is preferred, and 50 to 300 μm is more preferred. When the thickness of the thermoplastic resin layer 5 is less than 10 μm, there is a possibility that tears or through holes may occur during thermoforming, and there is also a risk that rigidity of an opening or the like of a container obtained by thermoforming may decrease. is there. On the other hand, if it exceeds 500 μm, the heating time must be lengthened, so that the surface of the small-cell-diameter foam layer 3 may be excessively heated, causing irregularities to occur, resulting in poor appearance.
【００６８】本発明において、大気泡径発泡層２、熱可
塑性樹脂補強層４及び小気泡径発泡層３から構成される
積層発泡シート１の厚さは、０．５〜７ｍｍが好まし
く、０．７〜５ｍｍがより好ましく、深絞り成形性に優
れているという観点からは０．７以上３ｍｍ未満が特に
好ましい。該積層発泡シートの厚さが０．５ｍｍ未満の
場合は、得られる容器の強度や断熱性が低下する虞があ
る。一方、該厚さが７ｍｍを超えると、熱成形を行う際
に、シートの内部と外部の間において加熱ムラが発生し
やすく、金型の形状を再現した容器を得ることができな
い虞がある。In the present invention, the thickness of the laminated foam sheet 1 composed of the large-cell-diameter foam layer 2, the thermoplastic resin reinforcing layer 4, and the small-cell-diameter foam layer 3 is preferably 0.5 to 7 mm, The thickness is more preferably 7 to 5 mm, and particularly preferably 0.7 to less than 3 mm from the viewpoint of excellent deep drawability. When the thickness of the laminated foamed sheet is less than 0.5 mm, the strength and heat insulation of the obtained container may be reduced. On the other hand, when the thickness exceeds 7 mm, when performing thermoforming, uneven heating tends to occur between the inside and the outside of the sheet, and there is a possibility that a container having the shape of the mold cannot be obtained.
【００６９】以下、本発明の積層発泡シート１の製造方
法について説明する。Hereinafter, a method for producing the laminated foam sheet 1 of the present invention will be described.
【００７０】大気泡径発泡層２は、押出機を用いて基材
樹脂と気泡調整剤等の各種の添加剤と発泡剤とを溶融混
練した後、目的とする樹脂温度に調整された発泡性溶融
混合物を、高圧のダイを通して大気圧下に放出すること
によって形成される。尚、発泡性溶融混合物が高圧のダ
イ内から大気圧下に放出される際、必要に応じて大気泡
径発泡層２に空気を吹きかけて冷却することによって、
平均気泡径を微調整することができる。The large-cell-diameter foamed layer 2 is prepared by melt-kneading a base resin, various additives such as a cell regulator, and a foaming agent by using an extruder, and then adjusting the foaming property adjusted to a target resin temperature. It is formed by discharging the molten mixture through a high pressure die under atmospheric pressure. When the foamable molten mixture is released from the inside of the high-pressure die under atmospheric pressure, air is blown onto the large-cell-diameter foam layer 2 as necessary to cool the foamable molten mixture.
The average bubble diameter can be fine-tuned.
【００７１】大気泡径発泡層２を形成するための発泡剤
の添加量、気泡調整剤の添加量は、基材樹脂の種類・発
泡剤の種類、気泡調整剤の種類や、目的とする各発泡層
の密度によって適宜選択できるが、通常は、基材樹脂１
００重量部に対して、発泡剤は０．５〜１０重量部、気
泡調整剤０．１〜１０重量部である。又、上記放出され
る溶融混合物の樹脂温度は、基材樹脂の種類、発泡剤の
種類、気泡調整剤の種類や、目的とする発泡層の密度に
よって適宜選択できるが、通常は１２０〜２５０℃であ
る。The amount of the foaming agent and the amount of the foam adjusting agent for forming the large-cell-diameter foamed layer 2 depend on the type of the base resin, the type of the foaming agent, the type of the foam adjusting agent, It can be appropriately selected depending on the density of the foamed layer.
The foaming agent is 0.5 to 10 parts by weight, and the foam control agent is 0.1 to 10 parts by weight with respect to 00 parts by weight. The resin temperature of the molten mixture to be released can be appropriately selected depending on the type of the base resin, the type of the foaming agent, the type of the cell regulator, and the density of the intended foamed layer. It is.
【００７２】大気泡径発泡層２における平均気泡径の調
整は、例えば、基材樹脂１００重量部当たり気泡調整剤
としてタルクを０．１〜４重量部添加することによって
行なう。The average cell diameter in the large cell diameter foam layer 2 is adjusted, for example, by adding 0.1 to 4 parts by weight of talc as a cell adjuster per 100 parts by weight of the base resin.
【００７３】小気泡径発泡層３を形成する方法は、気泡
調整剤の添加量が多い以外は、大気泡径発泡層２の場合
と同様である。具体的には、例えば、気泡調整剤として
タルクを２〜１０重量部添加する。又、小気泡径発泡層
３における平均気泡径は、気泡調整剤の量を調節する以
外に、発泡性溶融混合物が大気圧下に放出される際に空
気を吹きかけて冷却することによっても微調整すること
ができる。The method for forming the small-cell-diameter foam layer 3 is the same as that for the large-cell-diameter foam layer 2 except that the amount of the cell regulator added is large. Specifically, for example, 2 to 10 parts by weight of talc is added as a cell regulator. The average cell diameter in the small cell diameter foam layer 3 is also finely adjusted by blowing air when the foamable molten mixture is released under the atmospheric pressure and cooling, in addition to adjusting the amount of the cell regulator. can do.
【００７４】熱可塑性樹脂補強層４は、押出機を用いて
基材樹脂と必要な添加剤を溶融混練した後、目的とする
樹脂温度に調整された溶融混合物をダイを通して押出す
ことによって形成される。The thermoplastic resin reinforcing layer 4 is formed by melt-kneading a base resin and necessary additives using an extruder, and extruding a molten mixture adjusted to a desired resin temperature through a die. You.
【００７５】大気泡径発泡層２と熱可塑性樹脂補強層４
と小気泡径発泡層３とを積層する方法としては、共押出
法、熱融着法等が挙げられる。Large-cell-diameter foam layer 2 and thermoplastic resin reinforcing layer 4
As a method of laminating the foam layer 3 with the small-cell-diameter foam layer, a co-extrusion method, a heat fusion method and the like can be mentioned.
【００７６】上記共押出法は、大気泡径発泡層２を構成
する基材樹脂及び発泡剤等からなる発泡性溶融樹脂混合
物と、熱可塑性樹脂補強層４を構成する溶融樹脂混合物
と、小気泡径発泡層３を構成する基材樹脂及び発泡剤等
からなる発泡性溶融樹脂混合物とを、ダイ内で融着し一
体としてシート状に押出して発泡させる方法である。該
共押出法により積層シート１を得るための方法には、
フラットダイを用いて板状に共押出することにより大気
泡径発泡層２，熱可塑性樹脂補強層４，小気泡径発泡層
３が積層された積層発泡シートとする方法、環状ダイ
を用いて筒状に共押出した後、該筒状発泡シートを切開
いて大気泡径発泡層２，熱可塑性樹脂補強層４，小気泡
径発泡層３が積層された積層発泡シートとする方法が挙
げられる。The co-extrusion method comprises a foamable molten resin mixture comprising a base resin and a foaming agent constituting the large cell foam layer 2, a molten resin mixture constituting the thermoplastic resin reinforcing layer 4, This is a method in which a foamable molten resin mixture comprising a base resin, a foaming agent, and the like constituting the radially foamed layer 3 is fused in a die, extruded integrally into a sheet, and foamed. The method for obtaining the laminated sheet 1 by the co-extrusion method includes:
A method of forming a laminated foam sheet in which a large-cell-diameter foamed layer 2, a thermoplastic resin reinforcing layer 4, and a small-cell-diameter foamed layer 3 are laminated by co-extrusion into a plate shape using a flat die. After co-extrusion, the tubular foamed sheet is cut open to form a laminated foamed sheet in which a large cell foam layer 2, a thermoplastic resin reinforcing layer 4, and a small cell foam layer 3 are laminated.
【００７７】上記共押出法は、発泡工程と積層工程とを
同時にしかも連続的に行うことができるので生産性に優
れる上に、外観が極めてよいものが得られる。共押出法
の中では、上記の環状ダイを用いて筒状に共押出した
後、該筒状発泡シートを切開いて積層発泡シート１を得
る方法が、広幅の積層発泡シート１を製造しやすいので
好ましい。In the above coextrusion method, the foaming step and the laminating step can be performed simultaneously and continuously, so that not only excellent productivity but also an extremely good appearance can be obtained. In the co-extrusion method, a method of obtaining a laminated foamed sheet 1 by co-extruding into a tubular shape using the above-mentioned annular die and then cutting out the tubular foamed sheet is easy to produce a laminated foamed sheet 1 having a wide width. preferable.
【００７８】上記熱可塑性樹脂層５は、押出機を用いて
基材樹脂と各種の添加剤を溶融混練した後、Tダイやサ
ーキュラーダイ等の各種のダイからシート状に押出すこ
とによって形成することができる。The thermoplastic resin layer 5 is formed by melt-kneading a base resin and various additives using an extruder, and extruding a sheet from various dies such as a T die and a circular die. be able to.
【００７９】小気泡径発泡層３の表面に最外層を構成す
る熱可塑性樹脂層５を積層するには、熱可塑性樹脂層５
の押出樹脂温度と、大気泡径発泡層２と熱可塑性樹脂補
強層４と小気泡径発泡層３からなる積層発泡シート１と
の押出樹脂温度とが異なることが原因で、大気泡径発泡
層２、小気泡径発泡層３の連続気泡率が高くなる場合
は、予め形成された前期積層発泡シート１に熱可塑性樹
脂層５を接着剤や、加熱融着や、押出ラミネートによっ
て積層することが好ましい。但し、本発明はこれらに限
定するものではなく、共押出しによって積層することも
できる。以上、積層発泡シート１における小気泡径発泡
層３に熱可塑性樹脂層５が積層されている場合を説明し
てきたが、本発明の積層発泡シート１においては、大気
泡径発泡層２の表面に熱可塑性樹脂層５を積層すること
もできる。In order to laminate the thermoplastic resin layer 5 constituting the outermost layer on the surface of the small-cell-diameter foam layer 3, the thermoplastic resin layer 5
Is different from the extruded resin temperature of the large foamed foam layer 2, the thermoplastic resin reinforcing layer 4, and the laminated foamed sheet 1 composed of the small foamed foamed layer 3. 2. When the open cell ratio of the small-cell-diameter foam layer 3 increases, the thermoplastic resin layer 5 can be laminated on the pre-formed laminated foam sheet 1 by an adhesive, heat fusion, or extrusion lamination. preferable. However, the present invention is not limited to these, and can be laminated by co-extrusion. Although the case where the thermoplastic resin layer 5 is laminated on the small-cell-diameter foam layer 3 in the laminated foam sheet 1 has been described above, in the laminated foam sheet 1 of the present invention, the surface of the large-cell-diameter foam layer 2 The thermoplastic resin layer 5 can be laminated.
【００８０】以下、本発明の容器について説明する。本
発明の容器は、前述した積層発泡シート１を大気泡径発
泡層２が内面側に位置するように熱成形された容器であ
る。よって、深絞り形状の容器であっても、大気泡径発
泡層２に破れや透孔のない容器である。又、該容器は、
平均気泡径が小さく表面が平滑な小気泡径発泡層３に熱
可塑性樹脂層５が積層されているという構成の積層発泡
シート１から熱成形によって得られた容器は、熱可塑性
樹脂層５の表面が平滑になり、外観が美麗になる。しか
も深絞り形状の容器の外面側に印刷する場合に、かすれ
等の印刷不良が発生することが殆どない。Hereinafter, the container of the present invention will be described. The container of the present invention is a container obtained by thermoforming the above-described laminated foam sheet 1 so that the large-cell-diameter foam layer 2 is located on the inner surface side. Therefore, even if the container has a deep drawing shape, the large-cell-diameter foamed layer 2 has no breakage or a through hole. Also, the container is
The container obtained by thermoforming from the laminated foamed sheet 1 having a configuration in which the thermoplastic resin layer 5 is laminated on the small-cell-diameter foamed layer 3 having a small average cell diameter and a smooth surface has the surface of the thermoplastic resin layer 5. Becomes smooth and the appearance becomes beautiful. In addition, when printing is performed on the outer surface side of the deep drawing container, printing defects such as blurring rarely occur.
【００８１】又、本発明の容器は、大気泡径発泡層２と
小気泡径発泡層３との間に熱可塑性樹脂補強層４が設け
られているので、容器開口部の剛性に優れている。In the container of the present invention, since the thermoplastic resin reinforcing layer 4 is provided between the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3, the rigidity of the container opening is excellent. .
【００８２】更に、上記したように容器の内面側となる
大気泡径発泡層２を低分子量成分の含有率が少ないポリ
スチレン系樹脂発泡層として構成すると、容器内面に傷
がつきにくいと共に、剛性に優れた容器を得ることがで
きる。Furthermore, as described above, when the large-cell-diameter foamed layer 2 on the inner surface side of the container is formed of a polystyrene-based resin foamed layer having a low content of low molecular weight components, the inner surface of the container is hardly damaged and rigidity is improved. An excellent container can be obtained.
【００８３】本発明の容器は、雄型及び／又は雌型から
なる金型を使用して積層発泡シート１を熱成形すること
により得ることができる。該熱成形法としては、真空成
形や圧空成形、更にこれらの応用としてフリードローイ
ング成形、プラグ・アンド・リッジ成形、リッジ成形、
マッチド・モールド成形、ストレート成形、ドレープ成
形、リバースドロー成形、エアスリップ成形、プラグア
シスト成形、プラグアシストリバースドロー成形等やこ
れらを組み合わせた成形方法等が挙げられる。かかる熱
成形法は、短時間に連続して容器を得ることができるの
で、好ましい方法である。The container of the present invention can be obtained by thermoforming the laminated foam sheet 1 using a male and / or female mold. Examples of the thermoforming method include vacuum forming and pressure forming, and as these applications, free drawing forming, plug and ridge forming, ridge forming,
Matched mold molding, straight molding, drape molding, reverse draw molding, air slip molding, plug assist molding, plug assist reverse draw molding, and a molding method combining these are exemplified. Such a thermoforming method is a preferable method because a container can be continuously obtained in a short time.
【００８４】本発明の容器の絞り比は、通常は０．１〜
１．５であるが、０．３〜１．５の深絞りが好ましい。
絞り比が１．５より大きいと部分的に薄い箇所が発生す
る虞がある。尚、絞り比は、容器開口部の最大長さをＤ
とし、容器の深さをＨとして、Ｈ／Ｄによって定められ
る。The draw ratio of the container of the present invention is usually from 0.1 to 0.1.
It is 1.5, but a deep drawing of 0.3 to 1.5 is preferred.
If the aperture ratio is larger than 1.5, there is a possibility that a thin portion may occur partially. The aperture ratio is determined by the maximum length of the container opening, D
And H is the depth of the container, and is determined by H / D.
【００８５】本発明の容器は、トレイ、丼、弁当箱、カ
ップ等の用途に用いられる。特に、開口部の形状が円形
の深絞り形状の容器であって、小気泡径発泡層３の表面
に熱可塑性樹脂層５が設けられて最外層を構成している
積層シートを熱成形して得られたものは、曲面印刷性が
優れているので丼、カップ用として好適である。但し、
本発明の容器の用途は、これらに限定するものではな
い。The container of the present invention is used for applications such as trays, bowls, lunch boxes, cups and the like. In particular, a laminated sheet in which the shape of the opening is a circular deep-drawing shape, and the thermoplastic resin layer 5 is provided on the surface of the small-cell-diameter foamed layer 3 and constitutes the outermost layer is formed by thermoforming. The obtained product is suitable for bowls and cups because of its excellent curved surface printability. However,
The use of the container of the present invention is not limited to these.
【００８６】[0086]
【実施例】次に本発明を実施例によりさらに詳細に説明
する。Next, the present invention will be described in more detail with reference to examples.
【００８７】以下の実施例１〜３、比較例１，２におい
て、大気泡径発泡層２及び小気泡径発泡層３の基材樹脂
として、出光石油化学株式会社製ポリスチレン「ＨＨ３
２、溶融粘度２０４０Ｐａ・ｓ、密度１０５０ｋｇ／ｍ
3、ビカット軟化点１００℃以上」（以下、「樹脂Ａ」
という。）を使用した。In the following Examples 1 to 3 and Comparative Examples 1 and 2, polystyrene “HH3” manufactured by Idemitsu Petrochemical Co., Ltd. was used as a base resin for the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3.
2, melt viscosity 2040 Pa · s, density 1050 kg / m
3 , Vicat softening point 100 ° C or higher ”(hereinafter“ Resin A ”
That. )It was used.
【００８８】実施例４の場合は、大気泡径発泡層２の基
材樹脂として、低分子量成分の含有量が少ない東洋スチ
レン株式会社製ポリスチレン「トーヨースチロールＧＰ
ＨＲＭ−５５、密度１０５０ｋｇ／ｍ3、ビカット軟
化点１００℃以上」（以下、「樹脂Ｂ」という。）を使
用し、小気泡径発泡層３の基材樹脂として「樹脂Ａ」を
使用した。In the case of Example 4, as the base resin of the large-cell-diameter foamed layer 2, polystyrene “Toyostyrol GP” manufactured by Toyo Styrene Co., Ltd. having a low content of low molecular weight components is used.
HRM-55, density 1050 kg / m 3 , Vicat softening point 100 ° C. or higher ”(hereinafter referred to as“ resin B ”), and“ resin A ”as a base resin for the small-cell-diameter foam layer 3.
【００８９】実施例５の場合は、大気泡径発泡層２の基
材樹脂として、耐熱性の東洋スチレン株式会社製ポリス
チレン「トーヨースチロールＧＰ ＴＦ−２−３１１、
密度１０５０ｋｇ／ｍ3、ビカット軟化点１１０℃以
上」（以下、「樹脂Ｃ」という。）を使用し、小気泡径
発泡層３の基材樹脂として「樹脂Ａ」を使用した。In the case of Example 5, a heat-resistant polystyrene “Toyostyrol GP TF-2-311 manufactured by Toyo Styrene Co., Ltd.,
Density 1050 kg / m 3 , Vicat softening point 110 ° C. or higher ”(hereinafter referred to as“ resin C ”), and“ resin A ”as a base resin for the small-cell-diameter foam layer 3.
【００９０】上記樹脂Ａの溶融粘度は、チアスト社製レ
オビス２１００を使用して、内径１．０ｍｍ、長さ１０
ｍｍのノズルを用い、温度１９０℃、剪断速度１００／
ｓｅｃの条件下にて測定した。The melt viscosity of the resin A was measured using a Cheast Corporation Leovis 2100 with an inner diameter of 1.0 mm and a length of 10 mm.
mm nozzle, temperature 190 ° C, shear rate 100 /
It was measured under the conditions of sec.
【００９１】実施例１〜５、比較例１，２におけるタル
クは、松村産業株式会社製ハイフィラー♯１２を使用
し、発泡剤は、ｎ−ブタン７０ｗｔ％とｉｓｏ−ブタン
３０ｗｔ％からなるブタン混合物を使用した。The talc in Examples 1 to 5 and Comparative Examples 1 and 2 used High Filler # 12 manufactured by Matsumura Sangyo Co., Ltd., and the blowing agent was a butane mixture consisting of 70% by weight of n-butane and 30% by weight of iso-butane. It was used.
【００９２】実施例１〜５における熱可塑性樹脂補強層
４は、日本ポリスチレン株式会社製耐衝撃性ポリスチレ
ン（ＨＩＰＳ）「Ｈ６４０Ｎ（密度１０５０ｋｇ／
ｍ3）」（以下、「樹脂Ｄ」という。）を使用した。The thermoplastic resin reinforcing layer 4 in Examples 1 to 5 was made of high impact polystyrene (HIPS) “H640N (density 1050 kg /
m 3 ) ”(hereinafter referred to as“ resin D ”).
【００９３】実施例２〜５、比較例２における熱可塑性
樹脂層５は、「樹脂Ｄ」を使用した。As the thermoplastic resin layer 5 in Examples 2 to 5 and Comparative Example 2, "Resin D" was used.
【００９４】実施例１ 大気泡径発泡層２の形成には、バレル直径１１５ｍｍの
第一押出機とバレル直径１５０ｍｍの第二押出機とから
なるタンデム押出機を使用した。第一押出機の原料投入
口から、ポリスチレン系樹脂「樹脂Ａ」１００重量部に
タルク３．４重量部が添加された混合物を投入して加熱
混練し、該混合物を約２００℃に調整した後、樹脂Ａと
タルクの混合物１００重量部に対して３．２重量部の発
泡剤を圧入して発泡性溶融樹脂混合物とし、次いで、第
二押出機内で樹脂温度を１６５℃に調整した。Example 1 A tandem extruder comprising a first extruder having a barrel diameter of 115 mm and a second extruder having a barrel diameter of 150 mm was used for forming the large-cell-diameter foam layer 2. A mixture obtained by adding 3.4 parts by weight of talc to 100 parts by weight of a polystyrene-based resin “Resin A” from a raw material charging port of the first extruder is heated and kneaded, and the mixture is adjusted to about 200 ° C. Then, 3.2 parts by weight of a foaming agent was pressed into 100 parts by weight of the mixture of the resin A and talc to form a foamable molten resin mixture, and then the resin temperature was adjusted to 165 ° C. in the second extruder.
【００９５】熱可塑性樹脂補強層４の形成には、バレル
直径９０ｍｍの押出機を使用した。押出機の原料投入口
から、ポリスチレン系樹脂「樹脂Ｄ」を投入して加熱混
練し、押出機内の樹脂温度を１８０℃に調整した。For forming the thermoplastic resin reinforcing layer 4, an extruder having a barrel diameter of 90 mm was used. A polystyrene-based resin “Resin D” was charged from the raw material input port of the extruder and kneaded by heating, and the resin temperature in the extruder was adjusted to 180 ° C.
【００９６】小気泡径発泡層３の形成には、バレル直径
１１５ｍｍの第一押出機とバレル直径１５０ｍｍの第二
押出機とからなるタンデム押出機を使用した。第一押出
機の原料投入口から、ポリスチレン系樹脂「樹脂Ａ」１
００重量部にタルク４．０重量部が添加された混合物を
投入して加熱混練し、該混合物を約２００℃に調整した
後、樹脂Ａとタルクの混合物１００重量部に対して３．
２重量部の発泡剤を圧入して発泡性溶融樹脂混合物と
し、次いで、第二押出機内で樹脂温度を１６５℃に調整
した。A tandem extruder comprising a first extruder having a barrel diameter of 115 mm and a second extruder having a barrel diameter of 150 mm was used for forming the small cell diameter foam layer 3. Polystyrene resin “Resin A” 1
A mixture in which 4.0 parts by weight of talc was added to 00 parts by weight, and the mixture was heated and kneaded. The mixture was adjusted to about 200 ° C., and then added to 100 parts by weight of the mixture of resin A and talc.
2 parts by weight of a foaming agent was press-fitted into a foamable molten resin mixture, and then the resin temperature was adjusted to 165 ° C. in a second extruder.
【００９７】上記大気泡径発泡層２を形成する発泡性溶
融樹脂混合物（以下、「溶融樹脂Ｅ」という。）と、上
記小気泡径発泡層３を形成する発泡性溶融樹脂混合物
（以下、「溶融樹脂Ｆ」という。）と、上記熱可塑性樹
脂補強層４を形成する溶融樹脂混合物（以下、「溶融樹
脂Ｇ」という。）とを、溶融樹脂Ｅが内側に位置し、溶
融樹脂Ｆが外側に位置し、溶融樹脂Ｅと溶融樹脂Ｆとの
間に溶融樹脂Ｇが位置するように、共押出用ダイ内に導
入して（溶融樹脂Ｅの吐出量：溶融樹脂Ｆの吐出量：溶
融樹脂Ｇの吐出量＝２：１：２）、該ダイ内で合流させ
てから大気圧下に筒状に放出し、筒状に押出発泡させる
ことにより円筒状の積層発泡シート１を形成した。次
に、該円筒状の積層発泡シートの内側及び外側に空気を
吹きかけながら、該円筒状の積層発泡シート１を直径３
４０ｍｍの円柱状の冷却装置側面上を大気泡径発泡層２
が内側となるように通過させながら冷却した後、押出方
向に切開いて大気泡径発泡層２と熱可塑性樹脂補強層４
と小気泡径発泡層４とが積層された積層発泡シート１を
形成した。The foamable molten resin mixture (hereinafter, referred to as “molten resin E”) forming the large cell diameter foamed layer 2 and the foamable molten resin mixture (hereinafter, referred to as “molten resin E”) forming the small cell diameter foamed layer 3. The molten resin F is located on the inner side and the molten resin F is located on the outer side, and the molten resin mixture forming the thermoplastic resin reinforcing layer 4 (hereinafter, referred to as “molten resin G”). And the molten resin G is introduced into the co-extrusion die such that the molten resin G is located between the molten resin E and the molten resin F (the discharge amount of the molten resin E: the discharge amount of the molten resin F: the molten resin G discharge amount = 2: 1: 2), merged in the die, discharged in a cylindrical shape under atmospheric pressure, and extruded and foamed into a cylindrical shape to form a cylindrical laminated foamed sheet 1. Next, while blowing air inside and outside the cylindrical laminated foam sheet, the cylindrical laminated foam sheet 1
A large-cell-diameter foamed layer 2 is formed on the side of a 40 mm cylindrical cooling device.
After cooling while allowing the inside to pass through, a large cell diameter foam layer 2 and a thermoplastic resin reinforcing layer 4 are cut open in the extrusion direction.
To form a laminated foam sheet 1 in which the foam layer 4 and the small-cell-diameter foam layer 4 were laminated.
【００９８】実施例２ 実施例１と同様に大気泡径発泡層２と熱可塑性樹脂補強
層４と小気泡径発泡層４との積層体を形成した。次に、
押出ラミネート法により熱可塑性樹脂層５を形成した。
具体的には、バレル直径１１０ｍｍの押出機を使用し、
幅１２００ｍｍのＴダイから「樹脂Ｄ」を押出して、小
気泡径発泡層３の表面に熱可塑性樹脂層５を積層し積層
発泡シート１を得た。Example 2 In the same manner as in Example 1, a laminate of the large-cell-diameter foam layer 2, the thermoplastic resin reinforcing layer 4, and the small-cell-diameter foam layer 4 was formed. next,
The thermoplastic resin layer 5 was formed by an extrusion lamination method.
Specifically, using an extruder with a barrel diameter of 110 mm,
“Resin D” was extruded from a 1200 mm wide T-die, and a thermoplastic resin layer 5 was laminated on the surface of the small-cell-diameter foam layer 3 to obtain a laminated foam sheet 1.
【００９９】実施例３ 大気泡径発泡層２としてポリスチレン系樹脂「樹脂Ａ」
１００重量部あたりタルク２．８重量部が添加された混
合物を押出機に投入したこと、約２００℃に調整された
大気泡径発泡層２形成用の溶融樹脂混合物１００重量部
あたり２．５重量部の発泡剤を圧入したこと、小気泡径
発泡層４としてポリスチレン系樹脂「樹脂Ａ」１００重
量部に対してタルク３．２重量部が添加された混合物を
押出機に投入したこと、約２００℃に調整された小気泡
径発泡層４形成用の溶融樹脂混合物１００重量部に対し
て４．０重量部の発泡剤を圧入し、発泡剤の量を変える
ことにより大気泡径発泡層２と小気泡径発泡層３の厚さ
の割合を変えたこと以外は、実施例１と同様に大気泡径
発泡層２と熱可塑性樹脂補強層４と小気泡径発泡層４と
の積層体を形成し、これに実施例２と同様に熱可塑性樹
脂層を形成し本発明の積層発泡シート１を得た。Example 3 Polystyrene resin “Resin A” was used as the large-cell-diameter foam layer 2.
The mixture to which 2.8 parts by weight of talc was added per 100 parts by weight was introduced into the extruder, and 2.5 parts by weight per 100 parts by weight of the molten resin mixture for forming the large-cell-diameter foam layer 2 adjusted to about 200 ° C. Parts of the blowing agent, and a mixture obtained by adding 3.2 parts by weight of talc to 100 parts by weight of the polystyrene resin “Resin A” as the small-cell-diameter foamed layer 4 was introduced into the extruder. 4.0 parts by weight of a foaming agent is injected into 100 parts by weight of the molten resin mixture for forming the small-cell-diameter foam layer 4 adjusted to 0 ° C., and the large-cell-diameter foam layer 2 is formed by changing the amount of the foaming agent. A laminated body of the large-cell-diameter foam layer 2, the thermoplastic resin reinforcing layer 4, and the small-cell-diameter foam layer 4 was formed in the same manner as in Example 1 except that the thickness ratio of the small-cell-diameter foam layer 3 was changed. Then, a thermoplastic resin layer was formed thereon in the same manner as in Example 2, and To obtain a laminated foam sheet 1.
【０１００】実施例４ 大気泡径発泡層２としてポリスチレン系樹脂「樹脂Ｂ」
１００重量部あたりタルク３．２重量部が添加された混
合物を押出機に投入したこと、約２００℃に調整された
大気泡径発泡層２形成用の溶融樹脂混合物１００重量部
あたり４．０重量部の発泡剤を圧入したこと、小気泡径
発泡層４としてポリスチレン系樹脂「樹脂Ａ」１００重
量部に対してタルク２．８重量部が添加された混合物を
押出機に投入したこと、約２００℃に調整された小気泡
径発泡層４形成用の溶融樹脂混合物１００重量部に対し
て２．５重量部の発泡剤を圧入したこと、発泡剤の量を
変えることにより大気泡径発泡層２と小気泡径発泡層３
の厚さの割合を変えたこと以外は、実施例１と同様に大
気泡径発泡層２と熱可塑性樹脂補強層４と小気泡径発泡
層４との積層体を形成し、これに実施例２と同様に熱可
塑性樹脂層を形成し本発明の積層発泡シート１を得た。
尚、大気泡径発泡層２の低分子量成分は、８５０重量ｐ
ｐｍであった。Example 4 Polystyrene resin “Resin B” was used as the large-cell-diameter foam layer 2.
The mixture to which 3.2 parts by weight of talc was added per 100 parts by weight was charged into the extruder, and 4.0 parts by weight per 100 parts by weight of the molten resin mixture for forming the large cell foam layer 2 adjusted to about 200 ° C. Parts of the foaming agent, and a mixture obtained by adding 2.8 parts by weight of talc to 100 parts by weight of the polystyrene resin “Resin A” as the small-cell-diameter foamed layer 4 was introduced into the extruder. 2.5 parts by weight of a foaming agent was pressed into 100 parts by weight of the molten resin mixture for forming the small-cell-diameter foamed layer 4 adjusted to a temperature of 100 ° C., and the large-cell-diameter foamed layer 2 was obtained by changing the amount of the foaming agent. And small bubble diameter foam layer 3
A laminated body of a large-cell-diameter foamed layer 2, a thermoplastic resin reinforcing layer 4, and a small-cell-diameter foamed layer 4 was formed in the same manner as in Example 1 except that the thickness ratio was changed. A thermoplastic resin layer was formed in the same manner as in Example 2 to obtain a laminated foam sheet 1 of the present invention.
In addition, the low molecular weight component of the large-cell-diameter foam layer 2 is 850 weight p.
pm.
【０１０１】実施例５ 大気泡径発泡層２としてポリスチレン系樹脂「樹脂Ｃ」
１００重量部あたりタルク２．１重量部が添加された混
合物を押出機に投入したこと、約２００℃に調整された
大気泡径発泡層２形成用の溶融樹脂混合物１００重量部
あたり４．０重量部の発泡剤を圧入したこと、第二押出
機内で発泡性樹脂混合物の樹脂温度を１６５℃に調整し
たこと以外は、実施例３と同様に積層発泡シート１を得
た。Example 5 Polystyrene resin “Resin C” was used as the large cell diameter foam layer 2.
The mixture to which 2.1 parts by weight of talc was added per 100 parts by weight was charged into the extruder, and 4.0 parts by weight per 100 parts by weight of the molten resin mixture for forming the large-cell-diameter foam layer 2 adjusted to about 200 ° C. A foamed laminated sheet 1 was obtained in the same manner as in Example 3, except that the foaming agent in the part was press-fitted and the resin temperature of the foamable resin mixture was adjusted to 165 ° C. in the second extruder.
【０１０２】比較例１ 熱可塑性樹脂補強層４を形成しなかったこと以外は、実
施例１と同様に大気泡径発泡層２と小気泡径発泡層３と
の積層発泡シートを形成した。Comparative Example 1 A laminated foam sheet of a large-cell-diameter foam layer 2 and a small-cell-diameter foam layer 3 was formed in the same manner as in Example 1 except that the thermoplastic resin reinforcing layer 4 was not formed.
【０１０３】比較例２ 熱可塑性樹脂補強層４を形成しなかったこと以外は、実
施例２と同様に大気泡径発泡層２と小気泡径発泡層３と
熱可塑性樹脂層５との積層発泡シートを形成した。Comparative Example 2 Laminate foaming of the large-cell-diameter foamed layer 2, the small-cell-diameter foamed layer 3, and the thermoplastic resin layer 5 was performed in the same manner as in Example 2 except that the thermoplastic resin reinforcing layer 4 was not formed. A sheet was formed.
【０１０４】上記実施例１、比較例１において得られた
各積層発泡シートの大気泡径発泡層２の厚さ・平均気泡
径Ｌ１・密度、熱可塑性樹脂補強層４の厚さ・密度、小
気泡径発泡層３の厚さ・平均気泡径Ｌ２・密度、積層発
泡シートの厚さを表１に示す。In each of the laminated foam sheets obtained in Example 1 and Comparative Example 1, the thickness / average cell diameter L1 / density of the large cell foam layer 2 and the thickness / density of the thermoplastic resin reinforcing layer 4 were small. Table 1 shows the thickness / average cell diameter L2 / density of the foam layer 3 and the thickness of the laminated foam sheet.
【０１０５】上記実施例２〜５、比較例２において得ら
れた各積層発泡シートの大気泡径発泡層２の厚さ・平均
気泡径Ｌ１・密度、熱可塑性樹脂補強層４の厚さ・密
度、小気泡径発泡層３の厚さ・平均気泡径Ｌ２・密度、
熱可塑性樹脂層５の厚さ・密度、積層発泡シートの厚さ
を表２に示す。In each of the laminated foam sheets obtained in Examples 2 to 5 and Comparative Example 2, the thickness / average cell diameter L1 / density of the large cell foam layer 2 and the thickness / density of the thermoplastic resin reinforcing layer 4 were obtained. , Thickness of the small cell diameter foam layer 3, average cell diameter L2, density,
Table 2 shows the thickness / density of the thermoplastic resin layer 5 and the thickness of the laminated foam sheet.
【０１０６】尚、上記実施例１〜５、比較例１〜２にお
いて得られた大気泡径発泡層２，小気泡径発泡層３の連
続気泡率は、いずれも８〜２０％であった。又、大気泡
径発泡層２，小気泡径発泡層３と熱可塑性樹脂層５との
接着性は良好で、いずれの積層発泡シートについても剥
離試験において小気泡径発泡層３の材料破壊が確認され
た。The open cell ratio of the large cell foam layer 2 and the small cell foam layer 3 obtained in Examples 1 to 5 and Comparative Examples 1 and 2 was 8 to 20%. In addition, the adhesiveness between the large-cell-diameter foamed layer 2, the small-cell-diameter foamed layer 3, and the thermoplastic resin layer 5 is good, and in any of the laminated foamed sheets, material destruction of the small-cell-diameter foamed layer 3 was confirmed in the peeling test. Was done.
【０１０７】[0107]
【表１】 [Table 1]
【０１０８】[0108]
【表２】 [Table 2]
【０１０９】上記実施例、上記比較例における厚さの測
定は、具体的には前記した方法に基づいて次のように行
った。各実施例、比較例で得られた積層発泡シート１に
つき、試験片を幅方向に等間隔で１０箇所サンプリング
し、各試験片における押出方向に対して垂直な断面を顕
微鏡で撮影し、次に、各々の断面写真について各層の厚
さを測定し、該１０点の厚さの平均値を各層の厚さとし
た。The measurement of the thickness in the above Examples and Comparative Examples was specifically carried out as follows based on the method described above. With respect to the laminated foamed sheet 1 obtained in each of the examples and comparative examples, test pieces were sampled at equal intervals in the width direction at 10 points, and a cross section perpendicular to the extrusion direction of each test piece was photographed with a microscope. The thickness of each layer was measured for each cross-sectional photograph, and the average value of the thickness at the ten points was taken as the thickness of each layer.
【０１１０】上記実施例、上記比較例における小気泡径
発泡層３に熱可塑性樹脂層５が積層されている場合の密
度の具体的な測定方法は次のように行なった。A specific method for measuring the density when the thermoplastic resin layer 5 is laminated on the small-cell-diameter foamed layer 3 in the above Examples and Comparative Examples was performed as follows.
【０１１１】まず積層発泡シート１から、押出方向に平
行に長さ２０ｍｍ、幅５ｍｍの長方形の試験片を切出し
た。次に、該試験片からスライサーを用いて大気泡径発
泡層２を切り取り、残った試験片の厚さ方向断面につい
て顕微鏡で撮影し、該断面写真を使用して、熱可塑性樹
脂補強層４の厚さｔ４、小気泡径発泡層３の厚さｔ３を
測定した。次に、上記残った試験片の重量を測定し、該
測定値を熱可塑性樹脂補強層４の重量ｗ４（ｇ）と小気
泡径発泡層３の重量ｗ３（ｇ）の合計の重量ｗ３４
（ｇ）とした。次に、上記熱可塑性樹脂補強層４の厚さ
ｔ４、試験片の平面部分面積（５×２０ｍｍ2）、熱可
塑性樹脂補強層４の密度ｄ４（ｋｇ／ｍ3）とから、次
式を用いて小気泡径発泡層３の密度ｄ３を求めた。First, a rectangular test piece having a length of 20 mm and a width of 5 mm was cut out from the laminated foamed sheet 1 in parallel with the extrusion direction. Next, the large-cell-diameter foamed layer 2 was cut out from the test piece using a slicer, a cross section in the thickness direction of the remaining test piece was photographed with a microscope, and the cross-sectional photograph was used to form the thermoplastic resin reinforcing layer 4. The thickness t4 and the thickness t3 of the small cell diameter foam layer 3 were measured. Next, the weight of the remaining test piece was measured, and the measured value was used as the total weight w34 of the weight w4 (g) of the thermoplastic resin reinforcing layer 4 and the weight w3 (g) of the small-cell-diameter foam layer 3.
(G). Next, based on the thickness t4 of the thermoplastic resin reinforcing layer 4, the plane area of the test piece (5 × 20 mm 2 ), and the density d4 (kg / m 3 ) of the thermoplastic resin reinforcing layer 4, the following equation is used. Thus, the density d3 of the small-cell-diameter foam layer 3 was determined.
【０１１２】 ｗ４＝（ｔ４／１０3）×（２０×５／１０6）×ｄ４ ｄ３＝（ｗ３４−ｗ４）÷{（ｔ３／１０3）×（２０×
５／１０6）}W4 = (t4 / 10 3 ) × (20 × 5/10 6 ) × d4 d3 = (w34−w4) ÷ {(t3 / 10 3 ) × (20 ×
5/10 6 )}
【０１１３】次に、別の試験片（押出方向長さ２０ｍ
ｍ、幅５ｍｍ）を積層シート１より切出し、該試験片か
らスライサーを用いて小気泡径発泡層３を切り取り、切
取り後の試験片の厚さ方向断面について顕微鏡で撮影
し、該断面写真を使用して、大気泡径発泡層２の厚さｔ
２、熱可塑性樹脂補強層４の厚さｔ４を測定した。次
に、上記切取り後の試験片の重量を測定し、該測定値を
大気泡径発泡層２の重量ｗ２（ｇ）と熱可塑性樹脂補強
層４の重量ｗ４（ｇ）の合計の重量ｗ２４（ｇ）とし
た。次に、上記熱可塑性樹脂補強層４の厚さｔ４、試験
片の平面部分面積（５×２０ｍｍ2）、熱可塑性樹脂補
強層４の密度ｄ４（ｋｇ／ｍ3）とから、次式を用いて
大気泡径発泡層２の密度ｄ２を求めた。Next, another test piece (20 m long in the extrusion direction)
m, width 5 mm) from the laminated sheet 1, cut out the small-cell-diameter foamed layer 3 from the test piece using a slicer, photograph a cross section in the thickness direction of the cut test piece with a microscope, and use the cross-sectional photograph. And the thickness t of the large-cell-diameter foam layer 2
2. The thickness t4 of the thermoplastic resin reinforcing layer 4 was measured. Next, the weight of the test piece after the cutting was measured, and the measured value was used as the total weight w24 (g) of the weight w2 (g) of the large cell foam layer 2 and the weight w4 (g) of the thermoplastic resin reinforcing layer 4. g). Next, based on the thickness t4 of the thermoplastic resin reinforcing layer 4, the plane area of the test piece (5 × 20 mm 2 ), and the density d4 (kg / m 3 ) of the thermoplastic resin reinforcing layer 4, the following equation is used. Thus, the density d2 of the large-cell-diameter foam layer 2 was determined.
【０１１４】 ｗ４＝（ｔ４／１０3）×（２０×５／１０6）×ｄ４ ｄ２＝（ｗ２４−ｗ４）÷{（ｔ２／１０3）×（２０×
５／１０6）}[0114] w4 = (t4 / 10 3) × (20 × 5/10 6) × d4 d2 = (w24-w4) ÷ {(t2 / 10 3) × (20 ×
5/10 6 )}
【０１１５】上記実施例、上記比較例における小気泡径
発泡層３に熱可塑性樹脂層５が積層されていない場合の
密度の具体的な測定方法は、大気泡径発泡層２の密度ｄ
２については、積層発泡シート１から切出した試験片か
ら熱可塑性樹脂層５と小気泡径発泡層３を切り取りとる
こと以外は、小気泡径発泡層３に熱可塑性樹脂層５が積
層されていない場合と同様に行なった。小気泡径発泡層
３の密度ｄ３については、大気泡径発泡層２を切り取
り、切取り後の試験片の厚さ方向の断面写真を使用して
熱可塑性樹脂層５の厚さｔ５も測定し、切取り後の試験
片の重量を、熱可塑性樹脂補強層４の重量ｗ４小気泡径
発泡層３の重量ｗ３（ｇ）熱可塑性樹脂層５の重量ｗ５
（ｇ）の合計の重量ｗ３４５（ｇ）として次式を用いて
計算し、熱可塑性樹脂層５の重量ｗ５（ｇ）を熱可塑性
樹脂層５の基材樹脂の密度を用いて次式により計算する
こと以外は、小気泡径発泡層３に熱可塑性樹脂層５が積
層されていない場合と同様に行なった。A specific method of measuring the density when the thermoplastic resin layer 5 is not laminated on the small cell diameter foamed layer 3 in the above Examples and Comparative Examples is the density d of the large cell diameter foamed layer 2.
With respect to 2, the thermoplastic resin layer 5 is not laminated on the small-cell-diameter foam layer 3 except that the thermoplastic resin layer 5 and the small-cell-diameter foam layer 3 are cut out from a test piece cut out from the laminated foam sheet 1. Performed as in case. Regarding the density d3 of the small-cell-diameter foam layer 3, the large-cell-diameter foam layer 2 was cut out, and the thickness t5 of the thermoplastic resin layer 5 was also measured using a cross-sectional photograph in the thickness direction of the cut test piece. The weight of the test piece after cutting is calculated as follows: the weight w4 of the thermoplastic resin reinforcing layer 4, the weight w3 (g) of the foam layer 3 having a small cell diameter, and the weight w5 of the thermoplastic resin layer 5.
(G) is calculated using the following formula as a total weight w345 (g), and the weight w5 (g) of the thermoplastic resin layer 5 is calculated by the following formula using the density of the base resin of the thermoplastic resin layer 5. Other than that, the same procedure was performed as in the case where the thermoplastic resin layer 5 was not laminated on the small-cell-diameter foam layer 3.
【０１１６】 ｗ５＝（ｔ５／１０3）×（２０×５／１０6）×ｄ５ ｄ３＝{ｗ３４５−（ｗ４＋ｗ５）}÷{（ｔ３／１０3）
×（２０×５／１０6）}W5 = (t5 / 10 3 ) × (20 × 5/10 6 ) × d5 d3 = {w345- (w4 + w5)} ÷ {(t3 / 10 3 )
× (20 × 5/10 6 )}
【０１１７】以上の測定を、大気泡径発泡層２と小気泡
径発泡層３のそれぞれについて、積層発泡シート１の幅
方向における等間隔の１０箇所について行なった。The above measurement was carried out for each of the large-cell-diameter foam layer 2 and the small-cell-diameter foam layer 3 at 10 equally spaced locations in the width direction of the laminated foam sheet 1.
【０１１８】上記実施例１、比較例１において得られた
積層発泡シートについて、プラグアシスト法により大気
泡径発泡層２が内面側に位置するように熱成形して、開
口部が直径１５０ｍｍの円形、深さ７０ｍｍ、絞り比
０．４６の丼形状の容器を得た。The laminated foamed sheets obtained in Example 1 and Comparative Example 1 were thermoformed by a plug assist method so that the large-cell-diameter foamed layer 2 was positioned on the inner side, and the opening was a circle having a diameter of 150 mm. , A depth of 70 mm and a draw ratio of 0.46 were obtained.
【０１１９】実施例２〜５、比較例２において得られた
積層発泡シートについて、プラグアシスト法により大気
泡径発泡層２が積層された面を内面側に位置するように
熱成形して、開口部が直径１５０ｍｍの円形、深さ７０
ｍｍ、絞り比０．４６の丼形状の容器を得た。The laminated foam sheets obtained in Examples 2 to 5 and Comparative Example 2 were thermoformed by a plug assist method so that the surface on which the large-cell-diameter foam layer 2 was laminated was positioned on the inner side, and the opening was formed. The part is a circle with a diameter of 150 mm and a depth of 70
mm, and a bowl-shaped container having a squeezing ratio of 0.46 was obtained.
【０１２０】実施例１、比較例１においておいて得られ
た各容器の深絞り成形性、金型再現性、容器開口部の剛
性の評価を表３に、実施例２〜５、比較例２において得
られ得た各容器の深絞り成形性、印刷性、金型再現性、
容器開口部の剛性の評価を表４に示す。Table 3 shows the deep drawability, mold reproducibility, and rigidity of the opening of the container obtained in Example 1 and Comparative Example 1, and Examples 2 to 5 and Comparative Example 2 show the results. Deep drawability, printability, mold reproducibility of each container obtained in
Table 4 shows the evaluation of the rigidity of the container opening.
【０１２１】[0121]
【表３】 [Table 3]
【０１２２】[0122]
【表４】 [Table 4]
【０１２３】容器開口部の剛性は、株式会社エー・アン
ド・デイ製テンシロンＲＴＭ−５００を用いて上記丼形
状の開口面に対して水平方向に容器開口部の周縁を圧縮
速度１００ｍｍ／ｍｉｎで圧縮した。その際、長さ５２
ｍｍ×幅４ｍｍ×深さ４ｍｍ」の溝を有する治具に容器
開口部のフランジが溝に入るようにセットし、容器の内
径の１／２（７５ｍｍ）まで圧縮した時の最大応力を測
定し、該最大応力を剛性とした。尚、上記測定は、実施
例１〜５、比較例１，２において得られた各々の容器に
ついて、発泡層の押出方向（MD）及び押出方向に対して
垂直な方向（TD）の各々について３６個、合計７２個の
容器について行ない、全体の平均値を容器開口部の剛性
として次の様に評価した。 ○ …… 剛性が９．８N以上の場合。 × …… 剛性が９．８N未満の場合。The rigidity of the container opening is determined by compressing the peripheral edge of the container opening horizontally at a compression speed of 100 mm / min with respect to the bowl-shaped opening surface using Tensilon RTM-500 manufactured by A & D Corporation. did. At that time, length 52
mm × 4 mm × 4 mm depth ”, set the jig with the flange of the container opening into the groove, and measured the maximum stress when compressed to １ ／ (75 mm) of the inner diameter of the container. The maximum stress was defined as rigidity. In addition, the above measurement was carried out for each of the containers obtained in Examples 1 to 5 and Comparative Examples 1 and 2 in each of the extrusion direction (MD) of the foamed layer and the direction (TD) perpendicular to the extrusion direction. And a total of 72 containers, and the average value of the whole was evaluated as the rigidity of the container opening as follows. ○ …… When the rigidity is 9.8N or more. ×: When the rigidity is less than 9.8N.
【０１２４】深絞り成形性の評価は、成形の底部周縁等
の円弧状に引伸ばされて成形されている部分（以下、
「コーナー部」という。）に破れや透孔が発生している
か否かを目視にて評価した。 ○・・・容器のコーナー部に破れや透孔が発生していな
い。 ×・・・容器のコーナー部に破れや透孔が発生してい
る。The deep drawing formability was evaluated by examining the part formed by being stretched in an arc shape such as the periphery of the bottom part of the forming (hereinafter, referred to as the bottom part).
It is called "corner section". ) Were visually evaluated to see if tears or through holes had occurred.・ ・ ・: No breakage or through-hole occurred in the corner of the container. C: Torn or through-holes occurred at the corners of the container.
【０１２５】印刷性の評価は、容器の側面部に曲面印刷
を行い、容器の表面の印刷がかすれているかどうか否か
を目視にて評価した。 ○・・・容器の表面の印刷にかすれが無い。 ×・・・容器の表面の印刷にかすれがある。The printability was evaluated by performing curved surface printing on the side surface of the container and visually checking whether or not the printing on the surface of the container was blurred.・ ・ ・: There is no blur on the printing on the surface of the container. ×: The printing on the surface of the container is faint.
【０１２６】金型再現性は熱成形を行い金型形状と同様
な容器が得られるか否かを評価した。 ○・・・金型形状と同様に再現されている。 ×・・・金型形状と同様に再現されていない。The mold reproducibility was evaluated by performing thermoforming to determine whether a container having the same shape as the mold was obtained.・ ・ ・: Reproduced in the same manner as the mold shape. ×: Not reproduced similarly to the mold shape.
【０１２７】以上の結果から、実施例１の本発明の積層
発泡シートから得られた容器は、比較例１の従来の積層
発泡シートから得られた容器と比較すると、剛性に優れ
ている。又、実施例２〜５の本発明の積層発泡シートか
ら得られた容器は、比較例２の従来の積層発泡シートか
ら得られた容器と比較すると、剛性に優れていることが
判る。又、実施例４で得られたポリスチレン系樹脂第一
発泡層の低分子量成分含有率を２０００重量ｐｐｍ以下
に構成した容器は、実施例２〜５の中でも開口部の剛性
が特に優れていた。尚、実施例５における大気泡径発泡
層２を耐熱性ポリスチレン系樹脂で構成した容器は、電
子レンジの加熱に耐え得る耐熱性を有するものであっ
た。From the above results, the container obtained from the laminated foam sheet of the present invention of Example 1 is superior in rigidity to the container obtained from the conventional laminated foam sheet of Comparative Example 1. Further, it can be seen that the containers obtained from the laminated foamed sheets of the present invention of Examples 2 to 5 are superior in rigidity to the container obtained from the conventional laminated foamed sheet of Comparative Example 2. Further, among the containers of Examples 2 to 5, the container in which the low-molecular-weight component content of the first polystyrene resin foam layer obtained in Example 4 was 2,000 ppm by weight or less was particularly excellent in the rigidity of the opening. The container in which the large-cell-diameter foamed layer 2 in Example 5 was made of a heat-resistant polystyrene resin had heat resistance enough to withstand heating in a microwave oven.
【０１２８】[0128]
【発明の効果】本発明の積層発泡シートは、平均気泡径
Ｌ１が１５０〜４５０μｍのポリスチレン系樹脂第一発
泡層と、平均気泡径Ｌ２が３５〜１８０μｍのポリスチ
レン系樹脂第二発泡層（但し、平均気泡径Ｌ１＞平均気
泡径Ｌ２）と、上記ポリスチレン系樹脂第一発泡層と上
記ポリスチレン系樹脂第二発泡層との間に熱可塑性樹脂
補強層が設けられているという構成を採用している。即
ち、ポリスチレン系樹脂第一発泡層とポリスチレン系樹
脂第二発泡層との間に熱可塑性樹脂補強層が設けられて
いるので、従来の積層発泡シートに比較すると曲げ強度
に優れている。The laminated foamed sheet of the present invention comprises a first foamed layer of a polystyrene resin having an average cell diameter L1 of 150 to 450 μm and a second foamed layer of a polystyrene resin having an average cell diameter L2 of 35 to 180 μm (provided that (Average cell diameter L1> average cell diameter L2), and a configuration in which a thermoplastic resin reinforcing layer is provided between the first polystyrene resin foam layer and the second polystyrene resin foam layer. . That is, since the thermoplastic resin reinforcing layer is provided between the first foamed polystyrene resin layer and the second foamed polystyrene resin layer, the flexural strength is superior to that of the conventional laminated foam sheet.
【０１２９】又、本発明の発泡層を構成するポリスチレ
ン系樹脂第一発泡層は、気泡径が大きく形成され、ポリ
スチレン系樹脂第二発泡層は気泡径が小さいにもかかわ
らず押出発泡時に強い冷却を受けずに形成されているの
で、ポリスチレン系樹脂第一発泡層が内面側に位置する
ように熱成形すると、成形性、特に深絞り成形性に優
れ、金型再現性にも優れている。更に、平均気泡径が小
さく表面が平滑なポリスチレン系樹脂第二発泡層に熱可
塑性樹脂層を積層すると、熱可塑性樹脂層が積層された
態様の積層発泡シートであって、熱可塑性樹脂層の表面
が平滑で、外観が美麗であって印刷性にも優れるものを
得ることができる。Further, the first foamed layer of polystyrene resin constituting the foamed layer of the present invention has a large cell diameter, and the second foamed layer of polystyrene resin has strong cooling during extrusion foaming despite its small cell diameter. Therefore, when the thermoforming is performed so that the first foamed layer of the polystyrene resin is located on the inner surface side, the moldability, especially the deep drawing moldability, and the mold reproducibility are excellent. Furthermore, when a thermoplastic resin layer is laminated on the second foam layer of a polystyrene resin having a small average cell diameter and a smooth surface, the laminated foam sheet in which the thermoplastic resin layer is laminated, the surface of the thermoplastic resin layer Which is smooth, has a beautiful appearance and is excellent in printability.
【０１３０】本発明の積層発泡シートは、ポリスチレン
系樹脂第一発泡層の密度が５０〜７００ｋｇ／ｍ3であ
って、ポリスチレン系樹脂第二発泡層の密度が５０〜７
００ｋｇ／ｍ3であるという構成を採用すると、熱成形
によって得られる容器が断熱性に優れると共に、破れや
透孔が発生する虞がない。ポリスチレン系樹脂第一発泡
層の密度をポリスチレン系樹脂第二発泡層の密度より大
きく構成すると、熱成形する際、更に破れや透孔の発生
がより発生しなくなる。又、ポリスチレン系樹脂第一発
泡層の密度をポリスチレン系樹脂第二発泡層の密度より
小さく構成すると、熱可塑性樹脂層の表面が更に平滑に
なり、熱成形時の金型再現性が更に向上する。又、ポリ
スチレン系樹脂第一発泡層の密度とポリスチレン系樹脂
第二発泡層の密度を等しく構成すると、熱成形する際の
加熱むらが発生しない。In the laminated foamed sheet of the present invention, the density of the first foamed layer of the polystyrene resin is 50 to 700 kg / m 3 and the density of the second foamed layer of the polystyrene resin is 50 to 7 kg / m 3.
When the configuration of 00 kg / m 3 is adopted, the container obtained by thermoforming has excellent heat insulating properties, and there is no risk of breakage or generation of holes. When the density of the first foamed layer of the polystyrene-based resin is configured to be higher than the density of the second foamed layer of the polystyrene-based resin, breakage and generation of pores are less likely to occur during thermoforming. When the density of the polystyrene-based resin first foamed layer is smaller than the density of the polystyrene-based resin second foamed layer, the surface of the thermoplastic resin layer is further smoothed, and the mold reproducibility during thermoforming is further improved. . Further, when the density of the first foamed layer of the polystyrene-based resin and the density of the second foamed layer of the polystyrene-based resin are configured to be equal, uneven heating during thermoforming does not occur.
【０１３１】本発明においては、熱可塑性樹脂補強層を
密度８００ｋｇ／ｍ3以上のポリスチレン系樹脂として
構成すると、熱可塑性樹脂補強層とポリスチレン系樹脂
第一発泡層及びポリスチレン系樹脂第二発泡層との層間
の接着性に優れると共に、強度、特に剛性に優れた積層
発泡シートを得ることができる。In the present invention, when the thermoplastic resin reinforcing layer is formed of a polystyrene resin having a density of 800 kg / m 3 or more, the thermoplastic resin reinforcing layer, the first foamed layer of the polystyrene resin, and the second foamed layer of the polystyrene resin can be used. It is possible to obtain a laminated foamed sheet having excellent adhesion between layers and excellent strength, particularly rigidity.
【０１３２】本発明においては、ポリスチレン系樹脂第
一発泡層の低分子量成分含有率が２０００重量ｐｐｍ以
下となるように構成すると、特に剛性に優れた積層発泡
シートを得ることができる。かかる積層発泡シートから
熱成形によって得られた容器は、開口部の剛性が特に優
れている。In the present invention, if the content of the low molecular weight component in the first foamed layer of the polystyrene resin is set to 2000 ppm by weight or less, a laminated foam sheet having particularly excellent rigidity can be obtained. The container obtained by thermoforming from the laminated foamed sheet has particularly excellent rigidity of the opening.
【０１３３】上記積層発泡シートのポリスチレン系樹脂
第二発泡層の表面に、最外層を構成する熱可塑性樹脂層
を設けると、熱可塑性樹脂層が積層された態様の積層発
泡シートであって、深絞り成形性に優れると共に、積層
発泡シートの強度、特に剛性を更に向上させることがで
きる。又、熱可塑性樹脂層の表面平滑性も優れたものを
となる。When the thermoplastic resin layer constituting the outermost layer is provided on the surface of the second foamed layer of the polystyrene resin of the laminated foamed sheet, the laminated foamed sheet in which the thermoplastic resin layer is laminated is provided. While being excellent in draw formability, the strength, especially the rigidity, of the laminated foamed sheet can be further improved. Further, the surface smoothness of the thermoplastic resin layer is also excellent.
【０１３４】本発明の容器は、ポリスチレン系樹脂第一
発泡層が積層された面が内面側に位置するように構成さ
れている。従って、本発明の容器は、従来の積層発泡シ
ートを熱成形した容器と比較し、容器の開口部等の剛性
に優れている。また、ポリスチレン系樹脂第二発泡層の
表面に最外層を構成する熱可塑性樹脂層が積層されてい
る積層発泡シートを熱成形することによって得られた容
器は、容器の外面側が平滑になり、外観が美麗になる。
しかも、深絞り形状の容器の外面側に印刷した場合であ
っても、かすれ等の印刷不良が発生しない。The container of the present invention is configured such that the surface on which the first foamed layer of polystyrene resin is laminated is located on the inner surface side. Therefore, the container of the present invention is superior in rigidity to the opening and the like of the container as compared with a conventional container obtained by thermoforming a laminated foamed sheet. Further, the container obtained by thermoforming a laminated foam sheet in which the thermoplastic resin layer constituting the outermost layer is laminated on the surface of the second polystyrene resin foam layer, the outer surface side of the container becomes smooth, Becomes beautiful.
Moreover, even when printing is performed on the outer surface side of the deep drawing container, printing defects such as blurring do not occur.
【図面の簡単な説明】[Brief description of the drawings]
【図１】図１は、本発明の積層発泡シートの縦断面図で
ある。FIG. 1 is a longitudinal sectional view of a laminated foam sheet of the present invention.
【図２】図２は、本発明の熱可塑性樹脂層が積層された
態様の積層発泡シートの縦断面図である。FIG. 2 is a vertical cross-sectional view of a laminated foamed sheet of an embodiment in which a thermoplastic resin layer of the present invention is laminated.
【符号の説明】 １ 積層発泡シート ２ ポリスチレン系樹脂第一発泡層 ３ ポリスチレン系樹脂第二発泡層 ４ 熱可塑性樹脂補強層 ５ 熱可塑性樹脂層[Description of Signs] 1 laminated foam sheet 2 polystyrene resin first foam layer 3 polystyrene resin second foam layer 4 thermoplastic resin reinforcing layer 5 thermoplastic resin layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3E033 AA08 AA09 AA10 AA20 BA14 BA15 BA16 BA17 BA19 BA22 BA26 BB04 BB08 CA03 CA08 CA20 EA09 FA01 GA03 3E086 AD05 AD06 BA04 BA16 BB51 BB62 BB85 CA01 4F100 AK01B AK01D AK12A AK12B AK12C BA03 BA04 BA06 BA07 BA10A BA10C BA10D BA16 CA01 DJ01A DJ01C GB16 GB23 JA09A JA13A JA13B JA13C JA20A JA20C JB16B JB16D JK10B YY00A YY00B YY00C ────────────────────────────────────────────────── ─── Continued on the front page F-term (reference) BA07 BA10A BA10C BA10D BA16 CA01 DJ01A DJ01C GB16 GB23 JA09A JA13A JA13B JA13C JA20A JA20C JB16B JB16D JK10B YY00A YY00B YY00C
Claims (6)
ポリスチレン系樹脂第一発泡層と、平均気泡径Ｌ２が３
５〜１８０μｍのポリスチレン系樹脂第二発泡層（但
し、平均気泡径Ｌ１＞平均気泡径Ｌ２）と、上記ポリス
チレン系樹脂第一発泡層と上記ポリスチレン系樹脂第二
発泡層との間に熱可塑性樹脂補強層が設けられているこ
とを特徴とする積層発泡シート。1. A polystyrene resin first foamed layer having an average cell diameter L1 of 150 to 450 μm, and an average cell diameter L2 of 3
A thermoplastic resin between the second foamed layer of polystyrene-based resin (average cell diameter L1> average cell diameter L2) of 5 to 180 μm and the first foamed layer of polystyrene-based resin and the second foamed layer of polystyrene-based resin A laminated foam sheet provided with a reinforcing layer.
５０〜７００ｋｇ／ｍ 3であって、ポリスチレン系樹脂
第二発泡層の密度が５０〜７００ｋｇ／ｍ3であること
を特徴とする請求項１記載の積層発泡シート。2. The density of the first foamed layer of polystyrene resin is
50-700kg / m ThreeAnd a polystyrene resin
The density of the second foam layer is 50 to 700 kg / mThreeBeing
The laminated foam sheet according to claim 1, wherein:
ｍ3以上のポリスチレン系樹脂からなることを特徴とす
る請求項１又は２記載の積層発泡シート。3. The thermoplastic resin reinforcing layer has a density of 800 kg /
laminated foam sheet as claimed in claim 1 or 2, wherein the consisting of m 3 or more polystyrene resin.
量成分含有率が２０００重量ｐｐｍ以下であることを特
徴とする請求項１〜３のいずれかに記載の積層発泡シー
ト。4. The laminated foam sheet according to claim 1, wherein the low-molecular-weight component content of the first foamed layer of the polystyrene resin is 2,000 ppm by weight or less.
に、最外層を構成する熱可塑性樹脂層が設けられている
ことを特徴とする請求項１〜４のいずれかに記載の積層
発泡シート。5. The laminated foam sheet according to claim 1, wherein a thermoplastic resin layer constituting an outermost layer is provided on the surface of the second polystyrene resin foam layer.
泡シートを熱成形して得られた容器であって、ポリスチ
レン系樹脂第一発泡層が内面側に位置することを特徴と
する容器。6. A container obtained by thermoforming the laminated foamed sheet according to claim 1, wherein the first foamed layer of a polystyrene resin is located on the inner surface side. container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36755999A JP2001179903A (en) | 1999-12-24 | 1999-12-24 | Laminated foamed sheet and container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36755999A JP2001179903A (en) | 1999-12-24 | 1999-12-24 | Laminated foamed sheet and container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001179903A true JP2001179903A (en) | 2001-07-03 |
Family
ID=18489618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36755999A Pending JP2001179903A (en) | 1999-12-24 | 1999-12-24 | Laminated foamed sheet and container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001179903A (en) |
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| JP2011025521A (en) * | 2009-07-24 | 2011-02-10 | Kaneka Corp | Extrusion foamed molding excellent in heat insulating performance |
| WO2012091003A1 (en) * | 2010-12-28 | 2012-07-05 | Komatsu Michio | Resin molded body containing fine powder paper, and method for producing same |
| WO2016077820A1 (en) * | 2014-11-14 | 2016-05-19 | Zephyros, Inc. | Multi-shot injection molded method and product |
| JP2018130869A (en) * | 2017-02-14 | 2018-08-23 | 住化プラステック株式会社 | Foamed laminated sheet and packing material |
| US10695962B2 (en) | 2016-03-18 | 2020-06-30 | Zephyros, Inc. | Members for directing expandable material for baffling, sealing, reinforcing |
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1999
- 1999-12-24 JP JP36755999A patent/JP2001179903A/en active Pending
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| JP2007160904A (en) * | 2005-12-16 | 2007-06-28 | Jsp Corp | Co-extruded laminated foam body and its molding |
| WO2011001791A1 (en) * | 2009-06-29 | 2011-01-06 | Komatsu Michio | Wood powder-containing resin molded article and method for producing the same |
| JP2011005811A (en) * | 2009-06-29 | 2011-01-13 | Michio Komatsu | Resin molded article containing wood powder, and manufacturing method of the same |
| JP4685990B2 (en) * | 2009-06-29 | 2011-05-18 | 道男 小松 | Wood powder-containing resin molded body and method for producing the same |
| US8361612B2 (en) | 2009-06-29 | 2013-01-29 | Michio Komatsu | Wood powder-containing resin molded product and method for producing the same |
| JP2011025521A (en) * | 2009-07-24 | 2011-02-10 | Kaneka Corp | Extrusion foamed molding excellent in heat insulating performance |
| WO2012091003A1 (en) * | 2010-12-28 | 2012-07-05 | Komatsu Michio | Resin molded body containing fine powder paper, and method for producing same |
| US9174370B2 (en) | 2010-12-28 | 2015-11-03 | Eco Research Institute Ltd. | Fine paper powder-containing resin molded object and manufacturing method thereof |
| WO2016077820A1 (en) * | 2014-11-14 | 2016-05-19 | Zephyros, Inc. | Multi-shot injection molded method and product |
| US11198236B2 (en) | 2014-11-14 | 2021-12-14 | Zephyros, Inc. | Multi-shot injection molded method and product |
| US10695962B2 (en) | 2016-03-18 | 2020-06-30 | Zephyros, Inc. | Members for directing expandable material for baffling, sealing, reinforcing |
| JP2018130869A (en) * | 2017-02-14 | 2018-08-23 | 住化プラステック株式会社 | Foamed laminated sheet and packing material |
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