JP4344997B2 - Easy-open coextruded multilayer film and easy-open laminate film - Google Patents
Easy-open coextruded multilayer film and easy-open laminate film Download PDFInfo
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- JP4344997B2 JP4344997B2 JP2003322888A JP2003322888A JP4344997B2 JP 4344997 B2 JP4344997 B2 JP 4344997B2 JP 2003322888 A JP2003322888 A JP 2003322888A JP 2003322888 A JP2003322888 A JP 2003322888A JP 4344997 B2 JP4344997 B2 JP 4344997B2
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- 239000005001 laminate film Substances 0.000 title claims description 25
- 229920005989 resin Polymers 0.000 claims description 140
- 239000011347 resin Substances 0.000 claims description 140
- 239000010410 layer Substances 0.000 claims description 130
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 39
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 39
- 238000010030 laminating Methods 0.000 claims description 33
- -1 polypropylene Polymers 0.000 claims description 30
- 229920001903 high density polyethylene Polymers 0.000 claims description 25
- 239000004700 high-density polyethylene Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 25
- 238000004806 packaging method and process Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 229920001384 propylene homopolymer Polymers 0.000 claims description 10
- 239000002356 single layer Substances 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 229920001155 polypropylene Polymers 0.000 claims description 9
- 235000013305 food Nutrition 0.000 claims description 7
- 238000003475 lamination Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 229920005653 propylene-ethylene copolymer Polymers 0.000 claims description 5
- 229920005604 random copolymer Polymers 0.000 description 21
- 230000001954 sterilising effect Effects 0.000 description 17
- 238000004659 sterilization and disinfection Methods 0.000 description 17
- 230000032798 delamination Effects 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 238000001125 extrusion Methods 0.000 description 13
- 239000000155 melt Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 11
- 239000003921 oil Substances 0.000 description 11
- 239000000565 sealant Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 210000001217 buttock Anatomy 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003851 corona treatment Methods 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 240000008415 Lactuca sativa Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000012045 salad Nutrition 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Closures For Containers (AREA)
- Laminated Bodies (AREA)
Description
本発明は、易開封性食品容器用蓋材として好適に使用できる共押出多層フィルムと、この共押出多層フィルム上に接着剤を介して基材が積層接着されたラミネートフィルムに関するものである。 The present invention relates to a coextruded multilayer film that can be suitably used as a lid for an easily openable food container, and a laminate film in which a substrate is laminated and bonded via an adhesive on the coextruded multilayer film.
従来、ポリプロピレンを主体とする合成樹脂包装体は、ボイル殺菌やレトルト殺菌による加熱殺菌が施される場合が多く、また、内容物も油成分を多く含む食品が充填され、殺菌時の破袋に耐えるような強固な熱封緘強度を施した包装体が広く使用されている。しかし、このような包装体を用いた場合、蓋材開封時に大きな力を要する為、内容物が漏れたり、汁が吹き出したりするという取り扱い上の煩わしさがあった。 Conventionally, a synthetic resin package mainly composed of polypropylene is often subjected to heat sterilization by boil sterilization or retort sterilization. Wrapped bodies with strong heat sealing strength that can withstand are widely used. However, when such a package is used, a large force is required at the time of opening the lid, and therefore, there is an inconvenience in handling that the contents leak or the juice blows out.
そこで、開封を容易にすべく、メルトフロー８ｇ／１０分以下のポリプロピレンと、密度が０．９３５以上の高密度ポリエチレンを特定比率でブレンドしてなるシール層を有するイージーピール可能なフィルム、例えば、メルトフロー４ｇ／１０分のポリプロピレンと、密度が０．９５の高密度ポリエチレンをブレンドしてなる厚さ５０μｍの単層シーラントフィルムに厚さ１２μｍのポリエステルフィルムをドライラミネートした易開封性ラミネートフィルムを蓋材フィルムとして使用する技術が知られている（例えば、特許文献１参照。）。 Therefore, an easy peelable film having a seal layer formed by blending polypropylene having a melt flow of 8 g / 10 min or less and high density polyethylene having a density of 0.935 or more in a specific ratio to facilitate opening, for example, Cover an easy-open laminate film in which a polyester film with a thickness of 12 μm is dry-laminated on a single-layer sealant film with a thickness of 50 μm, which is a blend of polypropylene with a melt flow of 4 g / 10 min and high-density polyethylene with a density of 0.95. The technique used as a material film is known (for example, refer to Patent Document 1).
また、ポリプロピレンと高密度ポリエチレンと低密度ポリエチレンを特定比率でブレンドしてなる単層シーラントフィルムを基材に積層してなる易開封性密封包装用積層材、例えば、プロピレン−エチレン共重合体と密度０．９６ｇ／ｃｍ３の高密度ポリエチレンと密度０．９２２〜０．９３３ｇ／ｃｍ３の低密度ポリエチレンをブレンドしてなる厚さ３０μｍの単層シーラントフィルムに基材（ポリエステル１２μｍ／アルミニウム４０μｍ）をドライラミネートした易開封性ラミネートフィルムを蓋材フィルムとして使用する技術も知られている（例えば、特許文献２参照。）。 In addition, a laminate for easy-opening sealing packaging formed by laminating a single-layer sealant film obtained by blending polypropylene, high-density polyethylene and low-density polyethylene in a specific ratio on a base material, for example, propylene-ethylene copolymer and density the single layer sealant film with a thickness of 30μm obtained by blending a low density polyethylene 0.96 g / cm 3 density polyethylene and density 0.922~0.933g / cm 3 the substrate (polyester 12 [mu] m / aluminum 40 [mu] m) A technique using a dry laminated easy-open laminate film as a lid material film is also known (see, for example, Patent Document 2).
これら特許文献１と２に記載された易開封性ラミネートフィルムは、ポリプロピレンとポリエチレンが非相溶であることを利用した凝集破壊によって易開封性を発現しているが、シーラントフィルム全体が凝集破壊を起こすため、開封時に基材とシーラントフィルムの層間でデラミネーションを起こし易いという問題があった。また、前記特許文献２では低密度ポリエチレンを含有させているため、シーラントフィルムの耐油性が低下し、油を多く含む食品を包装して１２０℃程度の加熱殺菌を施すと、油のシーラントフィルムへの浸透とシーラントフィルム中に含まれるポリエチレン成分の可塑化によってシール強度が極端に低下し、破袋を引き起こし易くなるという欠点があった。 These easy-opening laminate films described in Patent Documents 1 and 2 exhibit easy-opening properties by cohesive failure utilizing the incompatibility of polypropylene and polyethylene, but the entire sealant film shows cohesive failure. Therefore, there is a problem that delamination is likely to occur between the base material and the sealant film during opening. Moreover, since the low-density polyethylene is contained in the said patent document 2, when the oil resistance of a sealant film falls and the foodstuff which contains many oils is packaged and heat-sterilized at about 120 degreeC, it will become an oil sealant film. There is a drawback that the sealing strength is extremely lowered due to the penetration of the resin and the plasticization of the polyethylene component contained in the sealant film, and the bag is likely to be broken.
さらに、易開封性フィルムとしては、プロピレン−α−オレフィンランダム共重合体（ａ）、高密度ポリエチレン（ｂ）及びポリブテン−１（ｃ）とを含む樹脂組成物層（Ａ）とプロピレン系樹脂（ｄ）からなる基材層（Ｂ）、との少なくとも２層からなるシーラントフィルムが知られている（特許文献３参照。）。この特許文献３には、比較例１としてプロピレン−エチレンランダム共重合体８０質量％と密度０．９５３の高密度ポリエチレン２０質量％とからなる樹脂組成物層と、プロピレン単独重合体からなる基材層を有する２層構成のシーラントフィルムが記載されており、耐油性が比較的良好で、デラミネーションも発生しにくくなっているが、ヒートシール温度がやや高くなるとヒートシール強度が大きく上昇して、開封しにくくなったり、開封時にデラミネーションを発生し易くなる等の問題が発生する傾向が強く、容易に開封感良く、しかもデラミネーションの発生なしに開封できるヒートシール温度幅が狭いという欠点がある。 Furthermore, as an easily openable film, the resin composition layer (A) containing propylene-α-olefin random copolymer (a), high-density polyethylene (b) and polybutene-1 (c) and a propylene-based resin ( A sealant film composed of at least two layers of a base material layer (B) composed of d) is known (see Patent Document 3). In Patent Document 3, as Comparative Example 1, a resin composition layer comprising 80% by mass of a propylene-ethylene random copolymer and 20% by mass of high density polyethylene having a density of 0.953, and a substrate comprising a propylene homopolymer A two-layer sealant film having a layer is described, oil resistance is relatively good, and delamination is less likely to occur, but when the heat seal temperature is slightly higher, the heat seal strength is greatly increased, There is a strong tendency to cause problems such as difficulty in opening and easy delamination at the time of opening, and there is a drawback that the heat seal temperature range that can be easily opened without causing delamination is narrow. .
本発明の課題は、食品等の包装に用いられる蓋材フィルムとして、より広い温度範囲で容易に安定したヒートシールをすることが可能で、油分を含む食品でもレトルト殺菌やボイル殺菌の加熱殺菌中の破袋に耐えてヒートシール部分の破損が防止でき、しかも、開封時にデラミネーションを起こすことなく、容易に開封することができるフィルムと、このフィルムと基材とを積層接着してなるラミネートフィルムを提供することにある。 The problem of the present invention is that it is possible to easily and stably heat-seal in a wider temperature range as a lid material film used for packaging foods, etc., and during heat sterilization of retort sterilization and boil sterilization even for foods containing oil A film that can withstand bag breakage and prevent breakage of the heat-sealed part, and can be easily opened without causing delamination at the time of opening, and a laminate film obtained by laminating and bonding this film and a base material Is to provide.
本発明者等は上記課題を解決すべく、鋭意検討を重ねた結果、プロピレン系樹脂（ａ）を含有してなるラミネート用樹脂層（Ａ）と、プロピレン系樹脂（ｂ１）および密度０．９５５ｇ／ｃｍ３以上の高密度ポリエチレン（ｂ２）を合計で９５重量％以上含有し、その重量比（ｂ１）／（ｂ２）が４０／６０〜７５／２５で、しかも、厚さが１〜１５μｍのヒートシール樹脂層（Ｂ）とが隣接して積層されている共押出多層フィルムをシーラントフィルムとして用いてなるラミネートフィルムは、従来より広い温度範囲で容易に安定したヒートシールをすることが可能で、開封時のデラミネーションもなく、耐油性に優れ、かつ易開封性に優れる包装体となることを見出し、本発明を完成するに至った。 As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a resin layer for laminate (A) containing a propylene-based resin (a), a propylene-based resin (b1) and a density of 0.955 g. / Cm 3 or more of high density polyethylene (b2) in a total of 95% by weight or more, the weight ratio (b1) / (b2) is 40/60 to 75/25, and the thickness is 1 to 15 μm A laminate film formed by using a coextruded multilayer film laminated adjacent to the heat seal resin layer (B) as a sealant film can be easily and stably sealed in a wider temperature range than before. It has been found that there is no delamination at the time of opening, an oil resistance and an easy-opening package, and the present invention has been completed.
すなわち、本発明は、プロピレン系樹脂（ａ）を含有してなるラミネート用樹脂層（Ａ）と、プロピレン系樹脂（ｂ１）および密度０．９５５ｇ／ｃｍ３以上の高密度ポリエチレン（ｂ２）を合計で９５重量％以上含有し、その重量比（ｂ１）／（ｂ２）が４０／６０〜７５／２５で、しかも、厚さが１〜１５μｍのヒートシール樹脂層（Ｂ）とが隣接して積層されていることを特徴とする共押出多層フィルムを提供するものである。 That is, the present invention provides a total of a laminate resin layer (A) containing a propylene resin (a), a propylene resin (b1) and a high density polyethylene (b2) having a density of 0.955 g / cm 3 or more. The heat-seal resin layer (B) having a weight ratio (b1) / (b2) of 40/60 to 75/25 and a thickness of 1 to 15 μm is laminated adjacently. A coextruded multilayer film is provided.
さらに、本発明は、前記共押出多層フィルムのラミネート用樹脂層（Ａ）上に接着剤を介して基材が積層接着されていることを特徴とするラミネートフィルムを提供するものである。 Furthermore, the present invention provides a laminate film characterized in that a base material is laminated and bonded to the laminate resin layer (A) of the coextruded multilayer film via an adhesive.
本発明の共押出多層フィルムおよびラミネートフィルムは、蓋材フィルムとして用いた場合、より広い温度範囲で容易に安定したヒートシールをすることが可能で、油分を含む食品でもレトルト殺菌やボイル殺菌の加熱殺菌中の破袋に耐えてヒートシール部分の破損が防止でき、しかも、開封時にデラミネーションを起こすことなく、容易に開封することができる。 When used as a lid material film, the coextruded multilayer film and laminate film of the present invention can be easily and stably heat-sealed in a wider temperature range, and can be heated for retort sterilization and boil sterilization even in foods containing oil. It can withstand rupture bags during sterilization, prevent damage to the heat seal portion, and can be easily opened without causing delamination at the time of opening.
本発明の共押出多層フィルムにおいて、ラミネート樹脂層（Ａ）としては、プロピレン系樹脂（ａ）を含有してなる単層構成または多層構成の樹脂層、例えば、（１）プロピレン系樹脂（ａ）を９０重量％以上含有してなる単層構成の樹脂層、（２）プロピレン−エチレン系共重合体を９０重量％以上含有してなる樹脂層（Ａ１）と、プロピレン単独重合体とを９０重量％以上含有してなる樹脂層（Ａ２）とを、前記樹脂層（Ａ１）がラミネート側の最外層で、前記樹脂層（Ａ２）がヒートシール樹脂層（Ｂ）の隣接層となるように積層してなる２層または３層構成の樹脂層であること好ましい。 In the coextruded multilayer film of the present invention, as the laminate resin layer (A), a resin layer having a single layer structure or a multilayer structure containing the propylene resin (a), for example, (1) propylene resin (a) 90% by weight of a resin layer having a monolayer structure containing 90% by weight or more, (2) a resin layer (A1) containing 90% by weight or more of a propylene-ethylene copolymer, and 90% by weight of a propylene homopolymer % Of the resin layer (A2) is contained so that the resin layer (A1) is the outermost layer on the laminate side and the resin layer (A2) is the adjacent layer of the heat seal resin layer (B). It is preferable that the resin layer has a two-layer or three-layer structure.
前記（１）の単層構成の樹脂層としては、例えば、プロピレン−エチレン系共重合体を９０重量％以上含有してなる樹脂層（Ａ１）や、プロピレン単独重合体とを９０重量％以上含有してなる樹脂層（Ａ２）が挙げられる。 The resin layer having a single layer structure (1) includes, for example, a resin layer (A1) containing 90% by weight or more of a propylene-ethylene copolymer or 90% by weight or more of a propylene homopolymer. The resin layer (A2) formed is mentioned.
なお、前記ラミネート樹脂層（Ａ）には、プロピレン系樹脂（ａ）以外の樹脂成分、例えば、プロピレン系樹脂（ａ）以外のオレフィン系樹脂や、プロピレン系フィルム製造時に発生するフィルム端部等の回収品等を混合することもできる。プロピレン系樹脂（ａ）以外の樹脂成分の混合割合は、ラミネート樹脂層中での含有率が１０〜４０重量％となる範囲である。また、前記プロピレン系樹脂（ａ）以外のオレフィン系樹脂としては、直鎖状低密度ポリエチレンが好ましい。 The laminate resin layer (A) has a resin component other than the propylene resin (a), such as an olefin resin other than the propylene resin (a), a film edge generated during the production of the propylene film, and the like. Collected products and the like can also be mixed. The mixing ratio of the resin components other than the propylene-based resin (a) is a range in which the content in the laminate resin layer is 10 to 40% by weight. Further, as the olefin resin other than the propylene resin (a), linear low density polyethylene is preferable.
前記プロピレン系樹脂（ａ）としては、例えば、プロピレン単独重合体、プロピレンとエチレン、ブテン−１等のα−オレフインとの共重合体が挙げられ、共重合体としてはランダム共重合体、ブロック共重合体のいすれもが使用できる。なかでも好ましいものとしては、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−ブテン−１ランダム共重合体等が挙げられる。前記プロピレン−エチレンランダム共重合体、プロピレン−エチレン−ブテン−１ランダム共重合体等のプロピレン系ランダム共重合体としては、なかでもプロピレン由来成分含有率が９０重量％以上のものが好ましく、９２〜９８重量％のものが特に好ましい。これらプロピレン系樹脂（ａ）は単独で用いても、混合して用いても構わない。 Examples of the propylene resin (a) include a propylene homopolymer, a copolymer of propylene and α-olefin such as ethylene and butene-1, and the copolymer includes a random copolymer and a block copolymer. Any polymer can be used. Of these, preferred are propylene homopolymer, propylene-ethylene random copolymer, propylene-ethylene-butene-1 random copolymer, and the like. The propylene-based random copolymer such as the propylene-ethylene random copolymer and the propylene-ethylene-butene-1 random copolymer preferably has a propylene-derived component content of 90% by weight or more. Particularly preferred is 98% by weight. These propylene resins (a) may be used alone or in combination.
前記ラミネート樹脂層（Ａ）の具体例としては、ラミネート側からヒートシール樹脂層に隣接する側に順に記載すると、
・ＨＯＰＰと必要により回収品からなる樹脂層、
・ＣＯＰＰと必要により回収品からなる樹脂層、
・ＨＯＰＰからなる樹脂層／（ＨＯＰＰおよび・またはＣＯＰＰ）と必要により回収品からなる樹脂層、
・ＣＯＰＰからなる樹脂層／（ＨＯＰＰおよび・またはＣＯＰＰ）と必要により回収品からなる樹脂層、
・ＨＯＰＰからなる樹脂層／（ＨＯＰＰおよび・またはＣＯＰＰ）と必要により回収品からなる樹脂層／（ＨＯＰＰおよび・またはＣＯＰＰ）からなる樹脂層、
・ＣＯＰＰからなる樹脂層／（ＣＯＰＰおよび・またはＨＯＰＰ）と必要により回収品からなる樹脂層／（ＨＯＰＰおよび・またはＣＯＰＰ）からなる樹脂層、
等が挙げられる。なお、ここにおいて、ＨＯＰＰはプロピレン単独重合体、ＣＯＰＰはプロピレン−エチレンランダム共重合体、回収品はプロピレン系フィルム製造時に発生するフィルム端部等の回収品を、それぞれ示す。
As a specific example of the laminate resin layer (A), when described in order from the laminate side to the side adjacent to the heat seal resin layer,
-Resin layer consisting of HOPP and, if necessary, recovered products,
-A resin layer consisting of COPP and, if necessary, recovered products,
-Resin layer made of HOPP / (HOPP and / or COPP) and, if necessary, a resin layer made of a recovered product,
A resin layer made of COPP / (HOPP and / or COPP) and, if necessary, a resin layer made of a recovered product,
A resin layer made of HOPP / (HOPP and / or COPP) and, if necessary, a resin layer made of a recovered product / a resin layer made of (HOPP and / or COPP),
A resin layer made of COPP / (COPP and / or HOPP) and a resin layer made of a recovered product if necessary / a resin layer made of (HOPP and / or COPP),
Etc. Here, HOPP is a propylene homopolymer, COPP is a propylene-ethylene random copolymer, and a recovered product is a recovered product such as a film edge generated during the production of a propylene film.
本発明の共押出多層フィルムにおいて、ヒートシール樹脂層（Ｂ）としては、プロピレン系樹脂（ｂ１）および密度０．９５５ｇ／ｃｍ３以上の高密度ポリエチレン（ｂ２）を合計で９５重量％以上含有してなる樹脂層であることが必須であり、プロピレン系樹脂（ｂ１）および高密度ポリエチレン（ｂ２）の合計の含有率が９５重量％未満の樹脂層、例えば低密度ポリエチレンを５重量％より多く含有する樹脂層では、耐油性が低下し、油を含む食品の包装体の加熱殺菌によりシール強度が低下し、破袋を引き起こし易くなるため好ましくない。 In the coextruded multilayer film of the present invention, the heat seal resin layer (B) contains a propylene resin (b1) and a high density polyethylene (b2) having a density of 0.955 g / cm 3 or more in total of 95% by weight or more. A resin layer in which the total content of the propylene-based resin (b1) and the high-density polyethylene (b2) is less than 95% by weight, for example, containing less than 5% by weight of low-density polyethylene. The resin layer to be used is not preferable because the oil resistance is lowered, and the seal strength is lowered by heat sterilization of the package of the food containing oil, and the bag is likely to be broken.
前記プロピレン系樹脂（ｂ１）としては、前記プロピレン系樹脂（ａ）と同様のプロピレン系樹脂がいずれも使用できるが、なかでもプロピレン−エチレンランダム共重合体、プロピレン−エチレン−ブテン−１ランダム共重合体が好ましい。これらプロピレン系樹脂（ｂ１）は単独で用いても混合して用いても構わない。 As the propylene-based resin (b1), any of the same propylene-based resins as the propylene-based resin (a) can be used, and among them, a propylene-ethylene random copolymer, propylene-ethylene-butene-1 random copolymer Coalescence is preferred. These propylene resins (b1) may be used alone or in combination.
前記高密度ポリエチレン（ｂ２）は、密度０．９５５ｇ／ｃｍ３以上であることが必須であり、なかでも密度０．９５７ｇ／ｃｍ３以上の高密度ポリエチレンが好ましい。密度０．９５５ｇ／ｃｍ３未満のポリエチレンでは耐熱性および耐油性が劣るヒートシール層となるため好ましくない。 The high-density polyethylene (b2), it is essential at a density 0.955 g / cm 3 or more, among them a density 0.957 g / cm 3 or more high-density polyethylene is preferred. Polyethylene having a density of less than 0.955 g / cm 3 is not preferable because it becomes a heat seal layer having poor heat resistance and oil resistance.
また、前記高密度ポリエチレン（ｂ２）としては、一般にフィルム成形等の押出成形で用いられる高密度ポリエチレン、例えばメルトフローレート（１９０℃）が０．０２〜２ｇ／１０ｍｉｎの高密度ポリエチレンよりも流動性の良好な高密度ポリエチレン、例えばメルトフローレート（１９０℃）が５〜２０ｇ／１０ｍｉｎの高密度ポリエチレンであることが、ポリプロピレンと共に溶融混練して押出成形した場合に比較的分散が良好となり、表面が平滑で透明性の良好なフィルムが得られることから好ましい。 The high-density polyethylene (b2) is more fluid than high-density polyethylene generally used in extrusion molding such as film molding, for example, high-density polyethylene having a melt flow rate (190 ° C.) of 0.02 to 2 g / 10 min. High density polyethylene, for example, high density polyethylene having a melt flow rate (190 ° C.) of 5 to 20 g / 10 min is relatively good dispersion when extruded by melt kneading with polypropylene, and the surface is It is preferable because a smooth and transparent film can be obtained.
前記ヒートシール樹脂層（Ｂ）において、プロピレン系樹脂（ｂ１）と高密度ポリエチレン（ｂ２）の重量比（ｂ１）／（ｂ２）としては、４０／６０〜７５／２５であることが必須であり、なかでも５０／５０〜７２／２８であることが好ましい。重量比（ｂ１）／（ｂ２）が４０／６０未満では、ヒートシール強度が低下するため好ましくなく、また７５／２５を越えると、ヒートシール温度がやや高くなるとヒートシール強度が大きく上昇して、開封しにくくなったり、開封時にデラミネーションを発生し易くなる等の問題が発生する傾向が強くなり、容易に開封感良く、しかもデラミネーションの発生なしに開封できるヒートシール温度幅が狭くなるため、やはり好ましくない。 In the heat seal resin layer (B), the weight ratio (b1) / (b2) of the propylene-based resin (b1) and the high-density polyethylene (b2) must be 40/60 to 75/25. Of these, 50/50 to 72/28 is preferable. When the weight ratio (b1) / (b2) is less than 40/60, the heat seal strength is lowered, which is not preferable. When it exceeds 75/25, the heat seal temperature is slightly increased and the heat seal strength is significantly increased. The tendency to generate problems such as difficult to open or easy to cause delamination at the time of opening becomes strong, and the heat seal temperature range that can be easily opened without occurrence of delamination becomes narrower. After all it is not preferable.
本発明の共押出多層フィルムの厚さ（全厚）とヒートシール樹脂層（Ｂ）の厚さは、用途によって異なり、特に限定されるものではないが、包装容器の蓋材フィルムとして好適に使用できることから、全厚が１０〜１５０μｍで、ヒートシール樹脂層（Ｂ）の厚さが１〜１５μｍであることが好ましく、なかでも全厚が２０〜８０μｍで、ヒートシール樹脂層（Ｂ）の厚さが２〜１０μｍであることが特に好ましい。ヒートシール樹脂層（Ｂ）の厚さが１未満では均一な厚さの樹脂層とすることが困難でヒートシール強度が不均一な樹脂層となりやすいため好ましくなく、また１５μｍを越えるとヒートシールの剥離部分に膜残りや毛羽立ち等による剥離外観の悪化があるため、やはり好ましくない。 The thickness (total thickness) of the coextruded multilayer film of the present invention and the thickness of the heat seal resin layer (B) vary depending on the application and are not particularly limited, but are preferably used as a lidding film for packaging containers. Therefore, it is preferable that the total thickness is 10 to 150 μm and the thickness of the heat seal resin layer (B) is 1 to 15 μm, and in particular, the total thickness is 20 to 80 μm and the thickness of the heat seal resin layer (B) is Is particularly preferably 2 to 10 μm. If the thickness of the heat seal resin layer (B) is less than 1, it is difficult to obtain a resin layer having a uniform thickness, and the heat seal strength tends to be a non-uniform resin layer. Since the peeling appearance deteriorates due to film residue or fluffing at the peeling portion, it is also not preferable.
本発明の共押出多層フィルムには、ラミネート層（Ａ）およびヒートシール層（Ｂ）のいずれかあるいは全ての層に他の熱可塑性樹脂、熱安定剤、帯電防止剤、アンチブロッキング剤、スリップ剤、防曇剤等を本発明の目的を損なわない範囲で添加しても良い。 In the coextruded multilayer film of the present invention, any or all of the laminate layer (A) and the heat seal layer (B) are provided with other thermoplastic resins, heat stabilizers, antistatic agents, antiblocking agents, and slip agents. Further, an antifogging agent or the like may be added within a range not impairing the object of the present invention.
本発明の共押出多層フィルムの製造方法としては、特に限定されないが、共押出積層成形法、例えば、２台以上の押出機を用いて溶融押出する、共押出多層ダイス法、フィードブロック法等の公知の共押出法により溶融状態で積層した後、インフレーション、Ｔダイ・チルロール法等の方法で長尺巻フイルムに加工する方法が好ましく、Ｔダイを用いた共押出法がより好ましい。 The method for producing the co-extruded multilayer film of the present invention is not particularly limited, but may be a co-extrusion lamination molding method, for example, a co-extrusion multi-layer die method, a feed block method, etc. that are melt-extruded using two or more extruders. After lamination in a molten state by a known co-extrusion method, a method of processing into a long wound film by a method such as inflation or a T-die / chill roll method is preferred, and a co-extrusion method using a T-die is more preferred.
本発明の共押出多層フィルムの製造に際してラミネート層（Ａ）は、印刷の接着性や接着剤との接着性を向上させるために、表面処理を施すことが望ましい。 In the production of the coextruded multilayer film of the present invention, the laminate layer (A) is preferably subjected to a surface treatment in order to improve the adhesiveness of printing and the adhesiveness with the adhesive.
この表面処理の方法は、本発明の共押出多層フィルムを連続的に処理でき、かつ、製膜時に巻き取る前に容易に実施でき、処理の度合いも任意に調整できるコロナ放電処理が望ましい。なお、表面処理に関しては加熱下または不活性ガスの雰囲気下でコロナ放電もしくはプラズマ放電等の効果促進手法を用いても良い。 The surface treatment method is preferably a corona discharge treatment that can continuously treat the coextruded multilayer film of the present invention, can be easily carried out before winding during film formation, and can arbitrarily adjust the degree of treatment. As for the surface treatment, an effect promoting method such as corona discharge or plasma discharge may be used under heating or in an inert gas atmosphere.
本発明の共押出多層フィルムを蓋材フィルムとして使用する際には、ラミネート層（Ａ）上に任意の基材を積層接着したものが、熱封着性、開封性、強度等の性能に優れる点から好ましい。この積層接着される基材としては、例えば、ポリエチレンテレフタレート、ポリプロピレン、ポリアミド、塩化ビニリデン樹脂、エチレンビニルアルコール共重合体等からなる基材がある。またこれらの積層接着する基材は単層に限らず多層に積層したもの等が任意に選択できる。この積層接着する基材は二軸延伸加工されたフィルムをラミネート加工等で積層接着することが望ましく、ラミネート加工としては、ドライラミネート、サーマルラミネート、押出ラミネート等任意の方法を用いることができる。また、接着性樹脂を介して、共押出ラミネートで積層しても良い。この基材の厚さは特に限定されるものではないが、熱封着性、易開封性に優れるラミネートフィルムが得られることから５〜３００μｍが好適である。 When the co-extruded multilayer film of the present invention is used as a cover material film, a laminate layer (A) with an arbitrary base material laminated and bonded is excellent in performance such as heat sealability, openability and strength. It is preferable from the point. Examples of the base material to be laminated and bonded include base materials made of polyethylene terephthalate, polypropylene, polyamide, vinylidene chloride resin, ethylene vinyl alcohol copolymer, and the like. In addition, the base material to be laminated and bonded is not limited to a single layer but can be arbitrarily selected from those laminated in multiple layers. The base material to be laminated and bonded is desirably laminated and bonded by laminating a biaxially stretched film. As the laminating process, any method such as dry lamination, thermal lamination, and extrusion lamination can be used. Moreover, you may laminate | stack by coextrusion lamination through adhesive resin. Although the thickness of this base material is not specifically limited, 5-300 micrometers is suitable from the laminated film which is excellent in heat sealing property and easy-opening property.
以下に実施例と比較例を挙げて、本発明を具体的に説明するが、本発明はこれらに限定されるものではない。尚、例中の部及び％は全て重量基準である。 EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these. In the examples, all parts and% are based on weight.
実施例１
ラミネート用樹脂層（Ａ）をラミネート側のラミネート用樹脂層（Ａ１）とヒートシール側のラミネート用樹脂層（Ａ２）の２層構成とし、ラミネート用樹脂層（Ａ１）用樹脂としてプロピレン単独重合体（ａ１）を用い、ラミネート用樹脂層（Ａ２）用樹脂としてプロピレン単独重合体（ａ１）と本共押出多層フィルムの両端部の回収品（ａ２）とを（ａ１）／（ａ２）＝９０／１０（重量比）で混合して用い、さらに、ヒートシール樹脂層（Ｂ）用樹脂としてプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ｂ１）とメルトフローレートが１８ｇ／１０ｍｉｎである密度０．９５８ｇ／ｃｍ３の高密度ポリエチレン（ｂ２）とを（ｂ１）／（ｂ２）＝６０／４０（重量比）で混合して用い、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給し、共押出法により押出温度２６０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１５μｍ／２７．５μｍ／７．５μｍになるように押出し、４０℃の水冷金属冷却ロールで冷却し、ラミネート樹脂層（Ａ）の濡れ張力が４０ｍＮ／ｍとなるようにコロナ放電処理を施した後、ロールに巻き取り、３５℃の熟成室で４８時間熟成させて、全厚が５０μｍの本発明の共押出多層フィルムを得た。
Example 1
The laminate resin layer (A) has a two-layer structure of a laminate-side laminate resin layer (A1) and a heat-seal-side laminate resin layer (A2), and a propylene homopolymer as a resin for the laminate resin layer (A1) Using (a1), propylene homopolymer (a1) as the resin for laminating resin layer (A2) and the recovered product (a2) at both ends of the coextruded multilayer film (a1) / (a2) = 90 / The propylene-ethylene random copolymer (b1) having a propylene-derived component content of 96% as a resin for the heat seal resin layer (B) and a melt flow rate of 18 g / For lamination, high-density polyethylene (b2) having a density of 0.958 g / cm 3 of 10 min is mixed at (b1) / (b2) = 60/40 (weight ratio). The resin layer (A1) extruder (caliber 40 mm), the laminate resin layer (A2) extruder (caliber 40 mm), and the heat seal resin layer (B) extruder (caliber 40 mm) are supplied and co-extruded. Extrusion was performed at a extrusion temperature of 260 ° C. from the T die so that each layer of (A1) / (A2) / (B) had a thickness of 15 μm / 27.5 μm / 7.5 μm, and a 40 ° C. water-cooled metal cooling roll After cooling and corona discharge treatment so that the wetting tension of the laminate resin layer (A) is 40 mN / m, it is wound on a roll and aged in a aging room at 35 ° C. for 48 hours. A coextruded multilayer film of the present invention was obtained.
得られた共押出多層フィルムのラミネート樹脂層（Ａ）側に、ウレタン系接着剤を使用して膜厚２５μｍの２軸延伸ナイロンフィルムをラミネートして、ラミネートフィルムを得た。 A biaxially stretched nylon film having a thickness of 25 μm was laminated on the laminate resin layer (A) side of the obtained coextruded multilayer film using a urethane adhesive to obtain a laminate film.
次いで、ラミネートフィルムを蓋材として、そのヒートシール樹脂層（Ｂ）と、プロピレン由来成分の含有率が９５％のプロピレン−エチレンランダム共重合体のシートからなり、幅５ｍｍ、外径９５ｍｍφの円形で厚さが６００μｍの鍔部を有する、サラダ油を充填した容量１５０ｃｍ３容器の鍔部とを重ね合わせ、包装機を使用して、温度１５０℃、１６０℃、１７０℃、１８０℃、１８５℃および１９０℃、時間１秒間、荷重１５０ｋｇの条件でヒートシールして、各温度でヒートシールしてなる６種類の包装袋とした後、それぞれ１２０℃で３０分間のレトルト殺菌を施し、冷却して、レトルト殺菌された包装袋を得た。 Next, using a laminate film as a cover material, the heat seal resin layer (B) and a propylene-ethylene random copolymer sheet having a propylene-derived component content of 95%, a circular shape having a width of 5 mm and an outer diameter of 95 mmφ Overlay the buttock of a 150 cm 3 container filled with salad oil having a buttock thickness of 600 μm and use a packaging machine to temperature 150 ° C, 160 ° C, 170 ° C, 180 ° C, 185 ° C and 190 ° C. After heat-sealing at 150 ° C. for 1 second under a load of 150 kg and heat-sealing at each temperature, six types of packaging bags were prepared, each was subjected to retort sterilization at 120 ° C. for 30 minutes, cooled, and retort A sterilized packaging bag was obtained.
前記レトルト殺菌した包装体５個の鍔部（ヒートシール部）から、ヒートシール強度測定用サンプル（サンプル幅１５ｍｍ）をそれぞれ等間隔で４サンプル切り出して得た合計２０サンプルについて、温度２３℃、引張速度３００ｍｍ／ｍｉｎ、９０度剥離の条件下でヒートシール強度を測定した。結果を第１表に示す。 A total of 20 samples obtained by cutting out four samples of the heat seal strength measurement (sample width: 15 mm) at equal intervals from the five retort-sterilized packaging parts (heat seal parts), at a temperature of 23 ° C. and tensile The heat seal strength was measured under the conditions of a speed of 300 mm / min and a 90-degree peeling. The results are shown in Table 1.
また、前記レトルト殺菌した包装体５個を、１ｍの高さから鉄板の上に落下させ、破袋の有無を確認し、全く破袋のなかったものを○、破袋が１以上あったものを×と評価した（落下テスト）。さらに、レトルト殺菌後の包装袋１０個を手で開封し、適度な力で容易に滑らかに開封できたものを○、容易には開封せず開封しずらいもの、または極めて弱い力で開封してしまうものを△、開封に特に強い力が必要できれいに開封できないものを×と開封感を評価すると共に、開封時にデラミネーションの発生したものの個数を測定した。これらの結果も第１表に示す。 In addition, 5 retort-sterilized packaging bodies were dropped onto an iron plate from a height of 1 m, checked for the presence or absence of bag breakage, those without any bag breakage, and those with one or more bag breakage. Was evaluated as x (drop test). Furthermore, 10 packaging bags after retort sterilization are opened by hand, and those that can be opened easily and smoothly with appropriate force are ○, those that are difficult to open without opening easily, or opened with extremely weak force The openness was evaluated as △, the opening required a particularly strong force, and the unopenable one as x, and the feeling of opening was evaluated, and the number of delaminations at the time of opening was measured. These results are also shown in Table 1.
実施例２
ラミネート用樹脂層（Ａ）をラミネート側のラミネート用樹脂層（Ａ１）とヒートシール側のラミネート用樹脂層（Ａ２）の２層構成とし、ラミネート用樹脂層（Ａ１）用樹脂としてプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ａ３）を用い、ラミネート用樹脂層（Ａ２）用樹脂としてプロピレン単独重合体（ａ１）を用い、さらに、ヒートシール樹脂層（Ｂ）としてプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ｂ１）とメルトフローレートが１８ｇ／１０ｍｉｎである密度０．９５８ｇ／ｃｍ３の高密度ポリエチレン（ｂ２）とを（ｂ１）／（ｂ２）＝６０／４０（重量比）で混合して用い、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給し、共押出法により押出温度２６０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが２０μｍ／２２．５μｍ／７．５μｍになるように押出した以外は実施例１と同様にして、全厚が５０μｍの本発明の共押出多層フィルムを得、更に同様にしてラミネートフィルムを得た。
Example 2
The laminating resin layer (A) has a two-layer structure including a laminating resin layer (A1) on the laminating side and a laminating resin layer (A2) on the heat seal side, and a propylene-derived component is used as the laminating resin layer (A1) resin. The propylene-ethylene random copolymer (a3) having a content of 96% is used, the propylene homopolymer (a1) is used as the resin for the laminating resin layer (A2), and further, propylene is used as the heat seal resin layer (B). Propylene-ethylene random copolymer (b1) having a content of the derived component of 96% and high density polyethylene (b2) having a melt flow rate of 18 g / 10 min and a density of 0.958 g / cm 3 (b1) / ( b2) = 60/40 (weight ratio) mixed and used, extruder for laminating resin layer (A1) (caliber 40 mm) and laminating The resin layer (A2) extruder (caliber 40 mm) and the heat seal resin layer (B) extruder (caliber 40 mm) are respectively supplied from the T die at an extrusion temperature of 260 ° C. by the coextrusion method (A1) / ( A coextruded multilayer film of the present invention having a total thickness of 50 μm was prepared in the same manner as in Example 1 except that the thicknesses of the respective layers A2) / (B) were 20 μm / 22.5 μm / 7.5 μm. In the same manner, a laminated film was obtained.
次いで、このラミネートフィルムを蓋材として用いた以外は実施例１と同様にして、ヒートシール温度条件の異なる６種類のレトルト殺菌を施した包装体を得た後、実施例１と同様にしてヒートシール強度の測定と、落下テストと、開封感の評価およびデラミネーション発生個数の測定とを行った。これらの結果を第１表に示す。 Next, except that this laminate film was used as a lid material, the package was subjected to six types of retort sterilization with different heat seal temperature conditions in the same manner as in Example 1 and then heated in the same manner as in Example 1. Measurement of the sealing strength, drop test, evaluation of opening feeling and measurement of the number of occurrences of delamination were performed. These results are shown in Table 1.
実施例３
ラミネート用樹脂層（Ａ）をラミネート側のラミネート用樹脂層（Ａ１）とヒートシール側のラミネート用樹脂層（Ａ２）の２層構成とするが、ここで用いるラミネート用樹脂層（Ａ１）用樹脂とラミネート用樹脂層（Ａ２）用樹脂として、いずれもプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ａ３）を用い、さらに、ヒートシール樹脂層（Ｂ）としてプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ｂ１）とメルトフローレートが１８ｇ／１０ｍｉｎである密度０．９５８ｇ／ｃｍ３の高密度ポリエチレン（ｂ２）とを（ｂ１）／（ｂ２）＝７０／３０（重量比）で混合して用い、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給し、共押出法により押出温度２６０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが２０μｍ／２２．５μｍ／７．５μｍになるように押出した以外は実施例１と同様にして、全厚が５０μｍの本発明の共押出多層フィルムを得、更に同様にしてラミネートフィルムを得た。
Example 3
The laminating resin layer (A) has a two-layer structure including a laminating resin layer (A1) on the laminating side and a laminating resin layer (A2) on the heat seal side. The resin for laminating resin layer (A1) used here As a resin for the laminate resin layer (A2), a propylene-ethylene random copolymer (a3) having a propylene-derived component content of 96% is used, and a propylene-derived component is used as the heat seal resin layer (B). A propylene-ethylene random copolymer (b1) having a content of 96% and a high density polyethylene (b2) having a melt flow rate of 18 g / 10 min and a density of 0.958 g / cm 3 (b1) / (b2) = 70/30 (weight ratio) mixed and used, laminating resin layer (A1) extruder (40 mm diameter) and laminating resin layer (A2) (A1) / (A2) / (B) from a T-die at an extrusion temperature of 260 ° C. by a coextrusion method by feeding to each of the extruder for extrusion (diameter 40 mm) and the heat seal resin layer (B) extruder (diameter 40 mm) ) To obtain a coextruded multilayer film of the present invention having a total thickness of 50 μm in the same manner as in Example 1 except that the layers were extruded so that the thickness of each layer was 20 μm / 22.5 μm / 7.5 μm. To obtain a laminate film.
次いで、このラミネートフィルムを蓋材として用いた以外は実施例１と同様にして、ヒートシール温度条件の異なる６種類のレトルト殺菌を施した包装体を得た後、実施例１と同様にしてヒートシール強度の測定と、落下テストと、開封感の評価およびデラミネーション発生個数の測定とを行った。これらの結果を第１表に示す。 Next, except that this laminate film was used as a lid material, the package was subjected to six types of retort sterilization with different heat seal temperature conditions in the same manner as in Example 1 and then heated in the same manner as in Example 1. Measurement of the sealing strength, drop test, evaluation of opening feeling and measurement of the number of occurrences of delamination were performed. These results are shown in Table 1.
比較例１
プロピレン由来成分の含有率が９６％で１９０℃におけるメルトフローレートが７ｇ／１０ｍｉｎであるプロピレン−エチレンランダム共重合体（ｂ１）と、１９０℃におけるメルトフローレートが２ｇ／１０ｍｉｎである密度０．９５０ｇ／ｃｍ３の高密度ポリエチレン（ｂ３）とを、（ｂ１）／（ｂ３）＝７０／３０（重量比）で混合して、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給した以外は実施例１と同様にして、全厚が５０μｍの比較用の単層フィルムを得、更に同様にしてラミネートフィルムを得た。
Comparative Example 1
Propylene-ethylene random copolymer (b1) having a propylene-derived component content of 96% and a melt flow rate of 7 g / 10 min at 190 ° C., and a density of 0.950 g having a melt flow rate of 2 g / 10 min at 190 ° C. / B / cm 3 high density polyethylene (b3) is mixed at (b1) / (b3) = 70/30 (weight ratio), an extruder for laminating resin layer (A1) (caliber 40 mm) and laminating Comparative example having a total thickness of 50 μm was carried out in the same manner as in Example 1 except that the resin layer (A2) extruder (caliber 40 mm) and the heat seal resin layer (B) extruder (caliber 40 mm) were supplied to each. A single layer film was obtained, and a laminate film was obtained in the same manner.
次いで、このラミネートフィルムを蓋材として用いた以外は実施例１と同様にして、ヒートシール温度条件の異なる６種類のレトルト殺菌を施した包装体を得た後、実施例１と同様にしてヒートシール強度の測定と、落下テストと、開封感の評価およびデラミネーション発生個数の測定とを行った。これらの結果を第１表に示す。 Next, except that this laminate film was used as a lid material, the package was subjected to six types of retort sterilization with different heat seal temperature conditions in the same manner as in Example 1 and then heated in the same manner as in Example 1. Measurement of the sealing strength, drop test, evaluation of opening feeling and measurement of the number of occurrences of delamination were performed. These results are shown in Table 1.
比較例２
プロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ｂ１）とメルトフローレートが１８ｇ／１０ｍｉｎである密度０．９６０ｇ／ｃｍ３の高密度ポリエチレン（ｂ４）とメルトフローレートが７ｇ／１０ｍｉｎである密度０．９２３ｇ／ｃｍ３の低密度ポリエチレン（ｂ５）とを、（ｂ１）／（ｂ４）／（ｂ５）＝５０／２５／２５（重量比）で混合して、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給した以外は実施例１と同様にして、全厚が５０μｍの比較用の単層フィルムを得、更に同様にしてラミネートフィルムを得た。
Comparative Example 2
Propylene-ethylene random copolymer (b1) having a propylene-derived component content of 96%, high density polyethylene (b4) with a density of 0.960 g / cm 3 with a melt flow rate of 18 g / 10 min, and a melt flow rate of 7 g. A low density polyethylene (b5) having a density of 0.923 g / cm 3 that is / 10 min is mixed at (b1) / (b4) / (b5) = 50/25/25 (weight ratio) to obtain a resin for laminating Except having supplied to the extruder for a layer (A1) (caliber 40mm), the extruder for a resin layer for lamination (A2) (caliber 40mm), and the extruder for a heat seal resin layer (B) (caliber 40mm), Example In the same manner as in Example 1, a comparative single layer film having a total thickness of 50 μm was obtained, and a laminate film was obtained in the same manner.
次いで、このラミネートフィルムを蓋材として用いた以外は実施例１と同様にして、ヒートシール温度条件の異なる６種類のレトルト殺菌を施した包装体を得た後、実施例１と同様にしてヒートシール強度の測定と、落下テストと、開封感の評価およびデラミネーション発生個数の測定とを行った。これらの結果を第１表に示す。 Next, except that this laminate film was used as a lid material, the package was subjected to six types of retort sterilization with different heat seal temperature conditions in the same manner as in Example 1 and then heated in the same manner as in Example 1. Measurement of the sealing strength, drop test, evaluation of opening feeling and measurement of the number of occurrences of delamination were performed. These results are shown in Table 1.
比較例３
ラミネート用樹脂層（Ａ）をラミネート側のラミネート用樹脂層（Ａ１）とヒートシール側のラミネート用樹脂層（Ａ２）の２層構成とするが、ここで用いるラミネート用樹脂層（Ａ１）用樹脂とラミネート用樹脂層（Ａ２）用樹脂として、いずれもプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ａ３）を用い、さらに、ヒートシール樹脂層（Ｂ）としてプロピレン由来成分の含有率が９６％のプロピレン−エチレンランダム共重合体（ｂ１）とメルトフローレートが１８ｇ／１０ｍｉｎである密度０．９５８ｇ／ｃｍ３の高密度ポリエチレン（ｂ２）とを（ｂ１）／（ｂ２）＝８０／２０（重量比）で混合して用い、ラミネート用樹脂層（Ａ１）用押出機（口径４０ｍｍ）とラミネート用樹脂層（Ａ２）用押出機（口径４０ｍｍ）とヒートシール樹脂層（Ｂ）用押出機（口径４０ｍｍ）のそれぞれに供給し、共押出法により押出温度２６０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが２０μｍ／２２．５μｍ／７．５μｍになるように押出した以外は実施例１と同様にして、全厚が５０μｍの本発明の共押出多層フィルムを得、更に同様にしてラミネートフィルムを得た。
Comparative Example 3
The laminating resin layer (A) has a two-layer structure including a laminating resin layer (A1) on the laminating side and a laminating resin layer (A2) on the heat seal side. The resin for laminating resin layer (A1) used here As a resin for the laminate resin layer (A2), a propylene-ethylene random copolymer (a3) having a propylene-derived component content of 96% is used, and a propylene-derived component is used as the heat seal resin layer (B). A propylene-ethylene random copolymer (b1) having a content of 96% and a high density polyethylene (b2) having a melt flow rate of 18 g / 10 min and a density of 0.958 g / cm 3 (b1) / (b2) = 80/20 (weight ratio) mixed and used, extruder for laminating resin layer (A1) (caliber 40 mm) and laminating resin layer (A2) (A1) / (A2) / (B) from a T-die at an extrusion temperature of 260 ° C. by a coextrusion method by feeding to an extruder for extrusion (diameter 40 mm) and an extruder for heat seal resin layer (B) (diameter 40 mm) ) To obtain a coextruded multilayer film of the present invention having a total thickness of 50 μm in the same manner as in Example 1 except that the layers were extruded so that the thickness of each layer was 20 μm / 22.5 μm / 7.5 μm. To obtain a laminate film.
次いで、このラミネートフィルムを蓋材として用いた以外は実施例１と同様にして、ヒートシール温度条件の異なる６種類のレトルト殺菌を施した包装体を得た後、実施例１と同様にしてヒートシール強度の測定と、落下テストと、開封感の評価およびデラミネーション発生個数の測定とを行った。これらの結果を第１表に示す。 Next, except that this laminate film was used as a lid material, the package was subjected to six types of retort sterilization with different heat seal temperature conditions in the same manner as in Example 1 and then heated in the same manner as in Example 1. Measurement of the sealing strength, drop test, evaluation of opening feeling and measurement of the number of occurrences of delamination were performed. These results are shown in Table 1.
本発明の共押出多層フィルムと、この共押出多層フィルム上に接着剤を介して基材が積層接着されたラミネートフィルムは、ポリプロピレン系樹脂からなる食品容器の蓋材として好適に使用できる。 The coextruded multilayer film of the present invention and the laminate film obtained by laminating and bonding the base material on the coextruded multilayer film via an adhesive can be suitably used as a lid for food containers made of polypropylene resin.
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| AU2008319934B2 (en) * | 2007-10-30 | 2013-01-31 | Dai Nippon Printing Co., Ltd. | Multilayered laminate film |
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| US8916249B2 (en) * | 2010-09-30 | 2014-12-23 | Dow Global Technologies Llc | Polymeric composition with sealant layer with same |
| JP6175768B2 (en) * | 2012-12-29 | 2017-08-09 | 三菱ケミカル株式会社 | Composite unstretched film for laminating |
| US20210300004A1 (en) * | 2016-10-03 | 2021-09-30 | Dic Corporation | Layered film, laminate film, and packaging container |
-
2003
- 2003-09-16 JP JP2003322888A patent/JP4344997B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802432A (en) * | 2014-01-23 | 2014-05-21 | 黄山永新股份有限公司 | Transparent, high-barrier, cooking-resistant and easy-to-tear cover film and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005088283A (en) | 2005-04-07 |
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