JP4938213B2 - Coextruded multilayer film and laminate film - Google Patents
Coextruded multilayer film and laminate film Download PDFInfo
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- JP4938213B2 JP4938213B2 JP2003395457A JP2003395457A JP4938213B2 JP 4938213 B2 JP4938213 B2 JP 4938213B2 JP 2003395457 A JP2003395457 A JP 2003395457A JP 2003395457 A JP2003395457 A JP 2003395457A JP 4938213 B2 JP4938213 B2 JP 4938213B2
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- 239000005001 laminate film Substances 0.000 title description 16
- 229920005989 resin Polymers 0.000 claims description 97
- 239000011347 resin Substances 0.000 claims description 97
- 239000000463 material Substances 0.000 claims description 28
- 229920001903 high density polyethylene Polymers 0.000 claims description 26
- 239000004700 high-density polyethylene Substances 0.000 claims description 26
- 229920001684 low density polyethylene Polymers 0.000 claims description 22
- 239000004702 low-density polyethylene Substances 0.000 claims description 22
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 16
- 239000005977 Ethylene Substances 0.000 claims description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 12
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 7
- 239000004711 α-olefin Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 70
- -1 polypropylene Polymers 0.000 description 20
- 238000010030 laminating Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 230000001954 sterilising effect Effects 0.000 description 11
- 238000004659 sterilization and disinfection Methods 0.000 description 11
- 239000000565 sealant Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 229920005604 random copolymer Polymers 0.000 description 9
- 239000002356 single layer Substances 0.000 description 9
- 230000032798 delamination Effects 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000012968 metallocene catalyst Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000003851 corona treatment Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- 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
- UPZFLZYXYGBAPL-UHFFFAOYSA-N 2-ethyl-2-methyl-1,3-dioxolane Chemical compound CCC1(C)OCCO1 UPZFLZYXYGBAPL-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 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
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000002648 laminated material Substances 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
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Closures For Containers (AREA)
- Wrappers (AREA)
Description
本発明は、ポリプロピレン系樹脂からなる易開封性食品容器用蓋材等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 easily openable food containers made of polypropylene resin, and a laminate film in which a base material is laminated and bonded to the coextruded multilayer film via an adhesive. It is about.
一般に冷蔵食品の包装容器として、蓋が容易に開封できる易開封性包装容器が広く使用されている。これらの包装容器は、流通や保管時に内容物を保護するための密封性が要求されるが、一方、内容物を取り出す際には、容易に開封できる易開封性を満足するものが要求されている。特に、飲料等の液体容器の蓋には、フィルム状の蓋材をヒートシールした上に、オーバーキャップで保護されたものがあるが、オーバーキャップをはめ込むために、開封のためのタブが小さく設計されたものが多い。このような小さな開封タブは、開封時に持ちにくいため、易開封性が特に要求される。さらには内容物が液状である場合には、開封強度が強いと開封時に内容物をこぼしたりすることがあるため、滑らかな易開封性が特に要求される。これらの密封性と易開封性を両立させるため、種々の易開封性シーラントフィルムが用いられている。 Generally, an easy-open packaging container that can easily open a lid is widely used as a packaging container for refrigerated foods. These packaging containers are required to have hermeticity for protecting the contents during distribution and storage. On the other hand, when taking out the contents, those that satisfy easy-openability that can be easily opened are required. Yes. In particular, some lids for liquid containers such as beverages are heat-sealed with a film-like lid and protected with an overcap. To fit the overcap, the opening tab is designed to be small. Many have been done. Such a small opening tab is difficult to hold at the time of opening, so that easy opening is particularly required. Furthermore, when the contents are liquid, if the opening strength is strong, the contents may be spilled at the time of opening, so that smooth easy opening is particularly required. In order to achieve both of these sealing properties and easy-opening properties, various easily-openable sealant films are used.
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の単層のシーラント用フィルムに厚さ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, An easy-open 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. A technique used as a lid material film is known (for example, see Patent Document 1).
また、基材に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のシーラント用フィルムよりなるシーラント層を基材と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の単層シーラント用フィルムに基材（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 material for easy-opening sealed packaging formed by laminating a base material with a sealant layer made of a single-layer sealant film obtained by blending a base material with polypropylene, high-density polyethylene and low-density polyethylene in a specific ratio, for example propylene - a single layer sealant film of the ethylene copolymer and density 0.96 g / cm 3 density polyethylene and density 0.922~0.933g / cm 3 low-density thickness 30μm polyethylene comprising a blend of A technique using an easy-open film obtained by dry laminating a base material (polyester 12 μm / aluminum 40 μm) as a lid material film is also known (for example, see Patent Document 2).
このような易開封性フィルムは、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熱接着界面でのシーラント用フィルムの凝集破壊によって易開封性を発現させようとするものであるが、開封時にシーラント用フィルムからなるヒートシール層が破断して基材とシーラント用フィルムの層間でデラミネーションを起こし易いため、ヒートシール温度条件等に伴うヒートシール強度の変動があり、広いヒートシール温度範囲で安定した開封感を得ることができないという欠点があった。 Such an easy-open film is intended to exhibit easy-openability by cohesive failure of the film for sealant at the heat-bonding interface utilizing the incompatibility of polypropylene and polyethylene. The heat seal layer made of the sealant film breaks and easily causes delamination between the base material and the sealant film, so the heat seal strength varies depending on the heat seal temperature conditions and is stable over a wide heat seal temperature range. However, there was a drawback that it was not possible to obtain a feeling of opening.
本発明の課題は、食品包装の蓋材等に用いられる易開封性フィルムとして、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、ボイル殺菌等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、開封タブが小さい容器の蓋材でも安定した開封感の良い開封を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 can be easily and stably heat-sealed over a wide temperature range as an easy-open film used for food packaging lids, etc., and resists broken bags during heat sterilization such as boil sterilization. A film that can prevent breakage of the heat-sealed portion, can be opened with a stable opening feeling even with a lid of a container having a small opening tab without causing delamination at the time of opening, and the film and the substrate. It is to provide a laminate film obtained by laminating and bonding.
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、基材とシーラント用樹脂層の間の緩衝用樹脂層としてエチレン系樹脂（ａ）を含有してなる厚さ１０μｍ以上の樹脂層をプロピレン系樹脂（ｂ１）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）を含有してなる厚さ０．５〜１０μｍのシーラント用樹脂層（ヒートシール樹脂層）に隣接して積層させ、この緩衝用樹脂層上に基材をラミネートしてなるラミネートフィルムは、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、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、開封時のデラミネーションもなく、開封タブが小さい容器の蓋材でも安定した開封感の良い開封をすることができ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 inventors of the present invention have a thickness of 10 μm or more containing an ethylene-based resin (a) as a buffer resin layer between the base material and the resin layer for sealant. The resin layer is adjacent to a sealant resin layer (heat seal resin layer) having a thickness of 0.5 to 10 μm containing propylene resin (b1), high density polyethylene (b2), and low density polyethylene (b3). Laminate film made by laminating and laminating a base material on this buffer resin layer can easily and stably heat-seal in a wide temperature range, and resists broken bags during heat sterilization of boil sterilization. It has been found that a package that can prevent damage to the heat-sealed part, has no delamination at the time of opening, and can be opened with a stable opening feeling even with a container with a small opening tab can be opened. The invention has been completed.
すなわち、本発明は、エチレン系樹脂（ａ）を含有してなる厚さ１０μｍ以上の樹脂層（Ａ）と、プロピレン系樹脂（ｂ１）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）を含有してなる厚さ０．５〜１０μｍ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 comprises a resin layer (A) having a thickness of 10 μm or more containing an ethylene resin (a), a propylene resin (b1), a high density polyethylene (b2), and a low density polyethylene (b3). The coextruded multilayer film is characterized in that a heat seal resin layer (B) having a thickness of 0.5 to 10 μm is laminated adjacently.
さらに、本発明は、前記共押出多層フィルムの樹脂層（Ａ）上に基材をラミネートしてなることを特徴とする蓋材を提供するものである。 Furthermore, the present invention provides a lid material obtained by laminating a base material on the resin layer (A) of the coextruded multilayer film.
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、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、ボイル殺菌でも破袋することなく、開封時にデラミネーションを起こすことなく、開封タブが小さい容器の蓋材でも安定した開封感の良い開封をすることができる。 The coextruded multilayer film and laminate film of the present invention, when used as a lid material film, can easily and stably heat-seal in a wide temperature range, and do not break even when boil sterilized. Even if the lid of a container having a small opening tab is used, it is possible to perform a stable opening with a good opening feeling.
本発明の共押出多層フィルムにおいて、樹脂層（Ａ）としては、エチレン系樹脂（ａ）を含有してなる単層構成または多層構成の樹脂層であり、例えば、（１）エチレン系樹脂（ａ）を５０重量％以上、好ましくは８０重量％以上含有してなる単層構成の樹脂層、（２）エチレン系樹脂を９０重量％以上、好ましくは９５重量％以上含有してなる樹脂層（Ａ１）と、エチレン系樹脂５０重量％以上、好ましくは８０重量％以上とエチ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および／またはエチレン系樹脂（ａ）以外の樹脂５０重量％以下、好ましくは２０重量％以下を含有してなる樹脂層（Ａ２）の２層構成の樹脂層等が挙げられる。 In the coextruded multilayer film of the present invention, the resin layer (A) is a resin layer having a single layer structure or a multilayer structure containing the ethylene resin (a). For example, (1) an ethylene resin (a ) In a single layer structure containing 50 wt% or more, preferably 80 wt% or more, (2) Resin layer (A1) containing 90 wt% or more, preferably 95 wt% or more of an ethylene-based resin. ) And 50% by weight or more, preferably 80% by weight or more of an ethylene-based resin, and a recovered product such as a film edge produced during the production of an ethylene-based film and / or a resin other than the ethylene-based resin (a), Includes a resin layer having a two-layer structure of a resin layer (A2) containing 20% by weight or less.
前記エチレン系樹脂（ａ）としては、例えば、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、低密度ポリエチレン（ＬＤＰＥ）、中密度ポリエチレン（ＭＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）等のポリエチレン樹脂、エチレン−酢酸ビニル共重合体、エチレン−メチルアクリレート共重合体、エチレン−エチルアクリレート共重合体、エチレン−メタクリル酸共重合体等が挙げられ、なかでもポリエチレン樹脂が好ましく、特に直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）が好ましく、密度０．９１８〜０．９５０ｇ／ｃｍ３の直鎖状低密度ポリエチレン（ＬＬＤＰＥ）が最も好ましい。これらエチレン系樹脂（ａ）は単独で用いても、混合して用いても構わない。 Examples of the ethylene resin (a) include polyethylene resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), and ethylene-acetic acid. A vinyl copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methacrylic acid copolymer, and the like are mentioned. Among them, a polyethylene resin is preferable, and a linear low density polyethylene (LLDPE) is particularly preferable. High-density polyethylene (HDPE) is preferable, and linear low-density polyethylene (LLDPE) having a density of 0.918 to 0.950 g / cm 3 is most preferable. These ethylene resins (a) may be used alone or in combination.
前記直鎖状低密度ポリエチレン（ＬＬＤＰＥ）としては、エチレンとブテン−１、ヘキセン−１、オクテン−１等のα−オレフインとの共重合体が挙げられる。なかでも好ましいものとしては、メタロセン触媒を用いて製造されたエチレン−ブテン−１共重合体、エチレン−ヘキセン−１共重合体等が挙げられ、なかでもエチレン由来成分含有率が９０重量％以上のものが好ましく、９０〜９８重量％のものが特に好ましい。これらエチレン系樹脂（ａ）は単独で用いても、混合して用いても構わない。 Examples of the linear low density polyethylene (LLDPE) include copolymers of ethylene and α-olefin such as butene-1, hexene-1, and octene-1. Among these, ethylene-butene-1 copolymer and ethylene-hexene-1 copolymer produced using a metallocene catalyst are preferable, and the ethylene-derived component content is 90% by weight or more. Is preferable, and 90 to 98% by weight is particularly preferable. These ethylene resins (a) may be used alone or in combination.
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）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）を含有してなる樹脂層であることが必須である。 In the coextruded multilayer film of the present invention, the heat seal resin layer (B) is a resin layer containing a propylene resin (b1), a high density polyethylene (b2), and a low density polyethylene (b3). It is essential.
前記プロピレン系樹脂（ｂ１）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等が挙げられ、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ずれもが使用できる。なかでも好ましいものとしては、プロピレン−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。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-based resin (b1) include propylene homopolymers, copolymers of propylene and α-olefins such as ethylene and butene-1, and the like include random copolymers and blocks. Any of the copolymers can be used. Among them, preferred are propylene-ethylene random copolymer, propylene-ethylene-butene-1 random copolymer and the like. These propylene resins (a) may be used alone or in combination.
前記高密度ポリエチレン（ｂ２）としては、密度０．９４５ｇ／ｃｍ３以上の高密度ポリエチレンが挙げられ、なかでも密度０．９５０〜０．９６５ｇ／ｃｍ３の高密度ポリエチレンが好ましい。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１０〜５０ｇ／１０ｍｉｎの高密度ポリエチレンであることが、プロピレン系樹脂（ｂ１）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。 As the high-density polyethylene (b2), it includes a density 0.945 g / cm 3 or more high-density polyethylene, among others high density polyethylene having a density of 0.950~0.965g / cm 3 are preferred. Moreover, as said high density polyethylene (b2), generally the high density whose fluidity | liquidity is better than the high density polyethylene whose melt flow rate (190 degreeC) used by extrusion molding, such as film molding, is 0.02-2 g / 10min. Polyethylene, for example, a high-density polyethylene having a melt flow rate (190 ° C.) of 10 to 50 g / 10 min, has relatively good dispersion when melt-kneaded and extruded with the propylene-based resin (b1), and the surface is It is preferable because a smooth and transparent film can be obtained.
前記低密度ポリエチレン（ｂ３）としては、密度０．９３０ｇ／ｃｍ３以下の低密度ポリエチレンが挙げられ、なかでも密度０．９１５〜０．９２５ｇ／ｃｍ３の低密度ポリエチレンが好ましい。また、一般にフィルム成形等の押出成形で用いられるメルトフローレート（１９０℃）が１〜１０ｇ／１０ｍｉｎの低密度ポリエチレンよりも流動性の良好な低密度ポリエチレン、例えばメルトフローレート（１９０℃）が１０〜５０ｇ／１０ｍｉｎの低密度ポリエチレンであることが、開封時に膜残りや毛羽立ち等の剥離外観の悪化がなく好ましい。 Examples of the low density polyethylene (b3) include low density polyethylene having a density of 0.930 g / cm 3 or less, and among them, low density polyethylene having a density of 0.915 to 0.925 g / cm 3 is preferable. In addition, a low density polyethylene having better fluidity than a low density polyethylene having a melt flow rate (190 ° C.) of 1 to 10 g / 10 min generally used in extrusion molding such as film molding, for example, a melt flow rate (190 ° C.) of 10 A low-density polyethylene of ˜50 g / 10 min is preferable because there is no deterioration in peeled appearance such as film residue and fluffing at the time of opening.
前記ヒートシール樹脂層（Ｂ）において、高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）の重量比（ｂ１）／（ｂ２）としては、ヒートシール強度や耐熱性の低下によるボイル殺菌中の破袋の発生を防止でき、開封時に膜残りや毛羽立ち等の剥離外観の悪化が発生しにくくなることから、７０／３０〜３０／７０であることが好ましく、なかでも６０／４０〜４０／６０であることがより好ましい。また、高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）の合計に対するプロピレン系樹脂（ｂ１）の重量比（ｂ１）／（ｂ２＋ｂ３）としては、ヒートシール強度や耐熱性の低下によるボイル殺菌中の破袋の発生を防止でき、開封時にはヒートシール樹脂層が凝集破壊して開封感の良好な開封強度を示すようになることから、８０／２０〜５５／４５が好ましく、なかでも７０／３００〜６０／４０であることがより好ましい。 In the heat seal resin layer (B), the weight ratio (b1) / (b2) between the high density polyethylene (b2) and the low density polyethylene (b3) is determined as a breakage during boil sterilization due to a decrease in heat seal strength or heat resistance. It is preferable to be 70/30 to 30/70, and it is preferable to be 60/40 to 40/60. More preferably. Further, the weight ratio (b1) / (b2 + b3) of the propylene-based resin (b1) to the total of the high-density polyethylene (b2) and the low-density polyethylene (b3) is as follows. 80/20 to 55/45 is preferable, since 70/55 to 45/45 is preferable, since the occurrence of broken bags can be prevented and the heat seal resin layer cohesively breaks at the time of opening to show good opening strength. More preferably, it is 60/40.
本発明の共押出多層フィルムの厚さ（全厚）と樹脂層（Ａ）ヒートシール樹脂層（Ｂ）の厚さは、用途等によって異なり、特に限定されるものではないが、包装容器の蓋材用フィルムとして好適に使用できることから、通常１５〜１５０μｍであり、なかでも２０〜１００μｍが好ましい。ヒートシール樹脂層（Ｂ）の厚さは、０．１〜１０μｍであることが好ましく、なかでも厚さ調整が比較的容易で均一な厚さの樹脂層とすることができ、ヒートシール強度が安定して適度な易開封強度を示し、開封時に膜残りや毛羽立ち等の剥離外観の悪化がないことから、２〜１０μｍがより好ましい。樹脂層（Ａ）の厚さは、ヒートシール樹脂層（Ｂ）の厚さ以上である１０μｍ以上であることが必須であり、なかでも１０〜９０μｍであることが好ましい。 The thickness (total thickness) of the coextruded multilayer film of the present invention and the thickness of the resin layer (A) and the heat seal resin layer (B) vary depending on the application and are not particularly limited. Since it can be used conveniently as a film for materials, it is 15-150 micrometers normally, and 20-100 micrometers is especially preferable. The thickness of the heat seal resin layer (B) is preferably 0.1 to 10 μm, and in particular, the thickness can be adjusted relatively easily and a resin layer having a uniform thickness can be obtained. It is more preferably 2 to 10 μm because it shows a stable and moderate easy-opening strength and there is no deterioration in peeled appearance such as film residue and fluffing at the time of opening. It is essential that the thickness of the resin layer (A) is 10 μm or more, which is not less than the thickness of the heat seal resin layer (B), and it is particularly preferably 10 to 90 μm.
本発明の共押出多層フィルムには、樹脂層（Ａ）およびヒートシール樹脂層（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。 The co-extruded multilayer film of the present invention includes any thermoplastic resin, heat stabilizer, antistatic agent, antiblocking agent, slip in any or all of the resin layer (A) and the heat seal resin layer (B). An agent, an antifogging agent, and the like may be added as long as the object of the present invention is not impaired.
本発明の共押出多層フィルムの製造方法としては、樹脂層（Ａ）とヒートシール樹脂層（Ｂ）が隣接して積層される共押出積層成形法であることが必要であり、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樹脂層（Ａ）とヒートシール樹脂層（Ｂ）を積層した後、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 coextruded multilayer film of the present invention needs to be a coextrusion lamination molding method in which the resin layer (A) and the heat seal resin layer (B) are laminated adjacent to each other. After the resin layer (A) and the heat seal resin layer (B) are laminated in a molten state by a known coextrusion method such as a coextrusion multilayer die method or a feed block method, which is melt extruded using the above extruder, inflation is performed. A method of processing into a long film by a method such as 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樹脂層（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 resin 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、樹脂層（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 coextruded multilayer film of the present invention is used as a lid material film, a laminate obtained by laminating and bonding an arbitrary base material on the resin layer (A) 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
樹脂層（Ａ）をラミネート側の樹脂層（Ａ１）とヒートシール側の樹脂層（Ａ２）の２層構成とし、樹脂層（Ａ１）用樹脂としてメタロセン触媒を用いて製造された直鎖状低密度ポリエチレン（ａ１）〔メタロセン触媒を用いて製造されたエチレン−ヘキセン−１共重合体、密度０．９３７ｇ／ｃｍ３、メルトフローレート（１９０℃）４．０ｇ／１０ｍｉｎ〕を用い、樹脂層（Ａ２）用樹脂として直鎖状低密度ポリエチレン（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−エチレンランダム共重合体（ｂ１）〔プロピレン由来成分の含有率９６％、メルトフローレート（２１０℃）７ｇ／１０ｍｉｎ〕と高密度ポリエチレン（ｂ２）〔メルトフローレート（１９０℃）１８ｇ／１０ｍｉｎ〕と低密度ポリエチレン（ｂ３）〔メルトフローレート（１９０℃）３５ｇ／１０ｍｉｎ、密度０．９１９ｇ／ｃｍ３〕を（ｂ１）／（ｂ２）／（ｂ３）＝６０／２０／２０（重量比）で混合して用い、樹脂層（Ａ１）用押出機（口径４０ｍｍ）と樹脂層（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２３０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１５μｍ／２０μｍ／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、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4０μｍの本発明の共押出多層フィルムを得た。
Example 1
The resin layer (A) has a two-layer structure of a resin layer (A1) on the laminate side and a resin layer (A2) on the heat seal side, and is a linear low produced using a metallocene catalyst as a resin for the resin layer (A1). Using a density polyethylene (a1) [ethylene-hexene-1 copolymer produced using a metallocene catalyst, density 0.937 g / cm 3 , melt flow rate (190 ° C.) 4.0 g / 10 min], a resin layer ( A2) A linear low density polyethylene (a1) as a resin and a recovered product (a2) at both ends of the coextruded multilayer film are mixed at (a1) / (a2) = 90/10 (weight ratio). Furthermore, propylene-ethylene random copolymer (b1) [content of propylene-derived component: 96%, melt flow rate (210 ° C.): 7 g / 10 mi as a resin for the heat seal resin layer (B) ] And high density polyethylene (b2) [melt flow rate (190 ℃) 18g / 10min] and low density polyethylene (b3) [melt flow rate (190 ℃) 35g / 10min, a density of 0.919 g / cm 3] (b1 ) / (B2) / (b3) = 60/20/20 (weight ratio), used as a resin layer (A1) extruder (caliber 40 mm) and resin layer (A2) extruder (caliber 40 mm) And the heat seal resin layer (B) extruder (40 mm diameter), and the thickness of each layer (A1) / (A2) / (B) from the T die at an extrusion temperature of 230 ° C. by coextrusion method. Extruded to 15 μm / 20 μm / 5 μm, cooled with a water-cooled metal cooling roll at 40 ° C., and subjected to corona discharge treatment so that the wetting tension of the resin layer (A) was 40 mN / m, and then wound around the roll , 5 ° C. of 48 hours aged at aging chamber, total thickness was obtained coextruded multilayer film of 40μm in the present invention.
得られた共押出多層フィルムの樹脂層（Ａ）側に、ウレタン系接着剤を使用して膜厚１２μｍの２軸延伸ポリエステル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 polyester film having a thickness of 12 μm was laminated on the 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％でメルトフローレート（２１０℃）が７ｇ／１０ｍｉｎ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、水を充填した容量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種類の包装体とした後、それぞれ９０℃で３０分間のボイル殺菌を施し、冷却して、ボイル殺菌された包装体を得た。 Next, using the 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% and a melt flow rate (210 ° C.) of 7 g / 10 min The container is superposed with a flange portion of a 150 cm 3 container filled with water and having a flange portion having a width of 5 mm and an outer diameter of 95 mmφ and a thickness of 600 μm. Heat seal under the conditions of 150 ° C., 170 ° C., 180 ° C., 185 ° C. and 190 ° C., time 1 second, load 150 kg, and heat seal at each temperature to obtain 6 types of packages, each at 90 ° C. for 30 Boil sterilization was performed for a minute, and the package was cooled to obtain a package sterilized by boil.
前記ボイル殺菌した包装体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 4 samples of the heat seal strength measurement (sample width: 15 mm) at equal intervals from the 5 buttocks (heat seal portions) of the boiled sterilized package, the temperature was 23 ° C. 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、ボイル殺菌後の包装袋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, the above-mentioned 10 packaging bags after boil sterilization were opened by hand, and those that could be opened easily and smoothly with an appropriate force were ○, those that were not easily opened but were difficult to open, or with very weak force The openness was evaluated as Δ, the openability was particularly strong and the openness was not evaluated 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
樹脂層（Ａ）をラミネート側の樹脂層（Ａ１）とヒートシール側の樹脂層（Ａ２）の２層構成とし、樹脂層（Ａ１）用樹脂および樹脂層（Ａ２）用樹脂として、いずれも直鎖状低密度ポリエチレン（ａ１）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−エチレンランダム共重合体（ｂ１）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ３）を（ｂ１）／（ｂ２）／（ｂ３）＝６０／２０／２０（重量比）で混合して用い、樹脂層（Ａ１）用押出機（口径４０ｍｍ）と樹脂層（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２３０℃でＴダイから（Ａ１）／（Ａ２）／（Ｂ）の各層の厚さが１５μｍ／２０μｍ／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４０μｍ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 resin layer (A) has a two-layer structure including a resin layer (A1) on the laminate side and a resin layer (A2) on the heat seal side. Both the resin layer (A1) resin and the resin layer (A2) resin are straight The chain low density polyethylene (a1) is used, and propylene-ethylene random copolymer (b1), high density polyethylene (b2) and low density polyethylene (b3) are used as the resin for the heat seal resin layer (B) (b1). / (B2) / (b3) = 60/20/20 (weight ratio) used by mixing, an extruder for resin layer (A1) (caliber 40 mm) and an extruder for resin layer (A2) (caliber 40 mm) Each of the layers (A1) / (A2) / (B) is 15 μm from the T die at an extrusion temperature of 230 ° C. by a coextrusion method by supplying to each of the heat seal resin layer (B) extruders (40 mm diameter). / 20μm / 5μm Except extruded in the same manner as in Example 1 so, total thickness to obtain a coextruded multilayer film of 40μm in the present invention, to obtain a laminate film was further similarly.
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種類のボイル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開封感の評価と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, a package body subjected to six types of boil sterilization with different heat seal temperature conditions was obtained in the same manner as in Example 1, and then heated in the same manner as in Example 1. Measurement of seal strength, evaluation of opening feeling, and measurement of the number of delamination occurrence were performed. These results are shown in Table 1.
比較例１
プロピレン−エチレンランダム共重合体（ｂ１）と高密度ポリエチレン（ｂ２）とを、（ｂ１）／（ｂ２）＝７０／３０（重量比）で混合して、樹脂層（Ａ１）用押出機（口径４０ｍｍ）と樹脂層（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４０μｍ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) and high-density polyethylene (b2) are mixed at (b1) / (b2) = 70/30 (weight ratio), and an extruder for the resin layer (A1) (caliber) 40 mm), a resin layer (A2) extruder (caliber 40 mm) and a heat seal resin layer (B) extruder (caliber 40 mm), respectively, except that the total thickness was 40 μm. A single-layer film for comparison 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種類のボイル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開封感の評価と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, a package body subjected to six types of boil sterilization with different heat seal temperature conditions was obtained in the same manner as in Example 1, and then heated in the same manner as in Example 1. Measurement of seal strength, evaluation of opening feeling, and measurement of the number of delamination occurrence were performed. These results are shown in Table 1.
比較例２
プロピレン−エチレンランダム共重合体（ｂ１）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ４）〔メルトフローレート７ｇ／１０ｍｉｎ、密度０．９２３ｇ／ｃｍ３〕を、（ｂ１）／（ｂ２）／（ｂ４）＝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４０μｍ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), high-density polyethylene (b2) and low-density polyethylene (b4) [melt flow rate 7 g / 10 min, density 0.923 g / cm 3 ], (b1) / (b2) / (B4) = 50/25/25 (weight ratio) mixed, extruder for laminating resin layer (A1) (diameter 40 mm), extruder for laminating resin layer (A2) (diameter 40 mm), and heat sealing A single layer film for comparison having a total thickness of 40 μm was obtained in the same manner as in Example 1 except that the resin layer (B) was supplied to each of the extruders (40 mm in diameter), 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種類のボイル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開封感の評価と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, a package body subjected to six types of boil sterilization with different heat seal temperature conditions was obtained in the same manner as in Example 1, and then heated in the same manner as in Example 1. Measurement of seal strength, evaluation of opening feeling, and measurement of the number of delamination occurrence were performed. These results are shown in Table 1.
比較例３
プロピレン−エチレンランダム共重合体（ｂ１）と高密度ポリエチレン（ｂ２）と低密度ポリエチレン（ｂ４）を（ｂ１）／（ｂ２）／（ｂ４）＝５０／４０／（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４０μｍ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 3
Propylene-ethylene random copolymer (b1), high-density polyethylene (b2) and low-density polyethylene (b4) are mixed at (b1) / (b2) / (b4) = 50/40 / (weight ratio), Except for supplying to each of the extruder for laminating resin layer (A1) (caliber 40 mm), the extruder for laminating resin layer (A2) (caliber 40 mm), and the extruder for heat seal resin layer (B) (caliber 40 mm). Produced a comparative single-layer film having a total thickness of 40 μm in the same manner as in Example 1, 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種類のボイル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開封感の評価と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, a package body subjected to six types of boil sterilization with different heat seal temperature conditions was obtained in the same manner as in Example 1, and then heated in the same manner as in Example 1. Measurement of seal strength, evaluation of opening feeling, and measurement of the number of delamination occurrence 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.
Claims (6)
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| JP2007045488A (en) * | 2005-08-11 | 2007-02-22 | Dainippon Printing Co Ltd | Food packaging container |
| JP2007045487A (en) * | 2005-08-11 | 2007-02-22 | Dainippon Printing Co Ltd | Food packaging container |
| JP4929822B2 (en) * | 2006-04-28 | 2012-05-09 | 大日本印刷株式会社 | Multi-layer laminated film for lid of packaging containers |
| JP5737560B2 (en) * | 2011-01-14 | 2015-06-17 | Dic株式会社 | Easy-open coextruded multilayer film and package using the same |
| KR101473330B1 (en) * | 2013-11-25 | 2014-12-16 | 주식회사 동서 | Inter-layer Easy peel multi-layer film and the manufacture method |
| EP3260295A1 (en) * | 2016-06-22 | 2017-12-27 | Dow Global Technologies LLC | Multilayer films and packages formed from same |
| KR20210027260A (en) * | 2018-07-03 | 2021-03-10 | 디아이씨 가부시끼가이샤 | Laminated film and cover material |
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