JP2008284706A - Coextruded multilayer film and packaging material composed thereof - Google Patents
Coextruded multilayer film and packaging material composed thereof Download PDFInfo
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- JP2008284706A JP2008284706A JP2007129185A JP2007129185A JP2008284706A JP 2008284706 A JP2008284706 A JP 2008284706A JP 2007129185 A JP2007129185 A JP 2007129185A JP 2007129185 A JP2007129185 A JP 2007129185A JP 2008284706 A JP2008284706 A JP 2008284706A
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- multilayer film
- coextruded multilayer
- propylene
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- 239000005022 packaging material Substances 0.000 title claims 2
- 239000010410 layer Substances 0.000 claims abstract description 101
- 239000011347 resin Substances 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 239000002344 surface layer Substances 0.000 claims abstract description 31
- 239000004711 α-olefin Substances 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 16
- 229920001577 copolymer Polymers 0.000 claims abstract description 15
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 14
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 14
- 239000002667 nucleating agent Substances 0.000 claims abstract description 13
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 11
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 11
- -1 polypropylene Polymers 0.000 claims description 11
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 5
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 abstract description 31
- 239000011230 binding agent Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 14
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 10
- 229920005604 random copolymer Polymers 0.000 description 10
- 238000003851 corona treatment Methods 0.000 description 9
- 238000007789 sealing Methods 0.000 description 7
- 229920000642 polymer Chemical class 0.000 description 6
- 239000005977 Ethylene Substances 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920001384 propylene homopolymer Polymers 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 229920011250 Polypropylene Block Copolymer Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 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
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005630 polypropylene random copolymer Polymers 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明は、易開封性に優れ、ピロー包装用として適度な剛性と耐熱性を有し、さらに、低温下での結束包装にも耐えうる耐寒性を有する共押出多層フィルムに関する。 The present invention relates to a coextruded multilayer film having excellent openability, moderate rigidity and heat resistance for pillow packaging, and cold resistance capable of withstanding bundled packaging at low temperatures.
従来の菓子パン等のピロー集積包装では、一般に無延伸ポリプロピレン系フィルム（ＣＰＰ）が使用されており、包装袋の開口部を、ひねって固定する結束具、即ちスリットを有する約２ｃｍ四方のプラスチック板、テープ、ひも等により結束した状態で販売されている。内容物が複数個のロールパンである場合や、単数個であっても大きなものの場合は、利便性を良くするため、再封が可能な結束具により何度も開閉できる形態の包装が多く使用されている。 In the conventional pillow integrated packaging such as confectionery bread, generally unstretched polypropylene film (CPP) is used, and a binding device for twisting and fixing the opening of the packaging bag, that is, a plastic plate of about 2 cm square having a slit, It is sold in the state of being bound by tape, string, etc. When the contents are a plurality of rolls, or when the number is large, a package that can be opened and closed many times with a re-sealable binding tool is often used for convenience. ing.
しかし、現行の無延伸ポリプロピレン系フィルムをピロー包装用フィルムとして用いて、高温でヒートシールした際にシール強度が高くなり、包装がきれいに開封できない、あるいは開封時にシール部以外の部分が破け、結束具での再封が困難な場合があった。また、低温でシールした場合でも、シール部の易開封性の安定性に劣り、シール強度が弱い場合には、包装時及び輸送時にシール部が開封し、結束部の隙間から虫等による異物混入の可能性があった。 However, using the current unstretched polypropylene film as a pillow packaging film, the seal strength increases when heat-sealed at high temperatures, and the packaging cannot be opened cleanly, or the parts other than the seal part are torn at the time of opening, and the binding tool In some cases, it was difficult to reseal. In addition, even when sealed at low temperatures, if the seal part is inferior in stability and the seal strength is weak, the seal part is opened during packaging and transportation, and foreign matter such as insects enters from the gaps in the binding part. There was a possibility.
一方、ヒートシール層にエチレン系重合体、エチレン・酢酸ビニル共重合体あるいはプロピレン・α−オレフィンランダム共重合体等を用いることにより、易開封性を付与することが提案されている。例えば、ヒートシール層として融点が１５８℃以上のプロピレン重合体（Ａ）２０〜８０重量％と密度が０．８６０〜０．９３０ｇ／ｃｍ３のエチレン系重合体（Ｂ）８０〜２０重量％とのプロピレン重合体組成物から得られる樹脂層を備えた易開封性積層フィルムが知られている（例えば、特許文献１参照。）。しかし、この易開封性積層フィルムは、主成分がポリプロピレンであるため、耐寒性が不充分で、低温下で結束具により結束する際に、結束部分で破袋を起こす問題があった。 On the other hand, it has been proposed to impart easy-openability by using an ethylene polymer, an ethylene / vinyl acetate copolymer, a propylene / α-olefin random copolymer, or the like for the heat seal layer. For example, 20 to 80% by weight of a propylene polymer (A) having a melting point of 158 ° C. or higher as a heat seal layer and 80 to 20% by weight of an ethylene polymer (B) having a density of 0.860 to 0.930 g / cm 3 An easy-open laminated film provided with a resin layer obtained from the propylene polymer composition is known (for example, see Patent Document 1). However, this easy-open laminated film has polypropylene as its main component, so that it has insufficient cold resistance, and has a problem of causing bag breakage at the bound portion when bound by a binding tool at a low temperature.
そこで、低温下で結束具により結束しても破袋しない耐寒性を有し、さらに、包装適性を損なうことのない剛性を有し、さらに易開封性に優れたフィルムが強く望まれている。
本発明の課題は、集積包装用ピロー包装用フィルムとして用いることができ、容易に手で開封できる易開封性と低温下で結束具により結束しても破袋しない耐寒性を有し、さらに包装適性を損なうことのない剛性を有した共押出多層フィルムを提供することである。 The problem of the present invention is that it can be used as a film for pillow packaging for integrated packaging, has an easy-opening property that can be easily opened by hand, and cold resistance that does not break even when bound by a binding tool at a low temperature. It is to provide a coextruded multilayer film having a rigidity that does not impair suitability.
発明者らは、上記課題を解決すべく鋭意研究した結果、融点１５０〜１７０℃のプロピレン系樹脂を主成分として造核剤を含有する表面層（Ａ）と、直鎖状低密度ポリエチレンを主成分とする中間層（Ｂ）と、低密度ポリエチレン（ｃ１）６５〜８５質量％及びエチレン−ブテン−１共重合体ラバー（ｃ２）１５〜３５質量％からなる中間層（Ｃ）と、プロピレン−αオレフィン共重合体を主成分とするシール層（Ｄ）との４層からなり、これら４つの層を表面層（Ａ）／中間層（Ｂ）／中間層（Ｃ）／シール層（Ｄ）の順で積層した共押出多層フィルムを、ピロー集積包装用フィルムとして用いると、充分なヒートシール強度を有し、易開封性に優れ、低温下で結束具により結束しても破袋しない耐寒性を有し、かつ包装適性が良好であることを見出し、本発明を完成するに至った。 As a result of intensive studies to solve the above problems, the inventors have mainly developed a surface layer (A) containing a nucleating agent mainly composed of a propylene resin having a melting point of 150 to 170 ° C. and a linear low-density polyethylene. An intermediate layer (B) as a component, an intermediate layer (C) comprising 65 to 85% by mass of low-density polyethylene (c1) and 15 to 35% by mass of an ethylene-butene-1 copolymer rubber (c2), and propylene- It consists of four layers with a seal layer (D) mainly composed of an α-olefin copolymer, and these four layers are surface layer (A) / intermediate layer (B) / intermediate layer (C) / seal layer (D). When the coextruded multilayer film laminated in the above order is used as a film for pillow integrated packaging, it has sufficient heat seal strength, is easy to open, and does not break even when bound by a binding tool at low temperatures. Have good packaging suitability Heading the door, which resulted in the completion of the present invention.
すなわち、本発明は、融点１５０〜１７０℃のプロピレン系樹脂（ａ）を主成分とし、造核剤を含有する表面層（Ａ）と、直鎖状低密度ポリエチレン（ｂ）を主成分とする中間層（Ｂ）と、低密度ポリエチレン（ｃ１）６５〜８５質量％及びエチレン−ブテン−１共重合体ラバー（ｃ２）１５〜３５質量％からなる中間層（Ｃ）と、プロピレン−α−オレフィン共重合体（ｄ）を主成分とするシール層（Ｄ）からなり、前記表面層（Ａ）、中間層（Ｂ）、中間層（Ｃ）及びシール層（Ｄ）が、（Ａ）／（Ｂ）／（Ｃ）／（Ｄ）の順で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 is composed mainly of a propylene resin (a) having a melting point of 150 to 170 ° C., and a surface layer (A) containing a nucleating agent and a linear low density polyethylene (b). An intermediate layer (B), an intermediate layer (C) composed of 65 to 85% by mass of low density polyethylene (c1) and 15 to 35% by mass of an ethylene-butene-1 copolymer rubber (c2), and propylene-α-olefin The surface layer (A), the intermediate layer (B), the intermediate layer (C), and the seal layer (D) are composed of a seal layer (D) containing a copolymer (d) as a main component. The present invention provides a coextruded multilayer film characterized by being laminated in the order of B) / (C) / (D).
本発明の共押出多層フィルムは、従来のピロー集積包装用フィルムと比較して、容易に手で開封できる易開封性を有し、低温下で結束具により結束しても破袋しない耐寒性を有し、かつ包装適性が良好である。したがって、各種食品包装用フィルムとして用いることができ、特にロールパン等の集積包装に使用されるピロー包装用フィルムとして好適に用いることができる。 The co-extruded multilayer film of the present invention has an easy-opening property that can be easily opened by hand, compared to conventional pillow integrated packaging films, and has a cold resistance that does not break even when bound by a binding tool at low temperatures. And has good packaging suitability. Therefore, it can be used as a film for various food packaging, and can be suitably used as a film for pillow packaging used for stacking packaging such as rolls.
本発明の共押出多層フィルムは、表面層（Ａ）、中間層（Ｂ）、中間層（Ｃ）及びシール層（Ｄ）が、（Ａ）／（Ｂ）／（Ｃ）／（Ｄ）の順で積層されたものであるが、各層に用いる樹脂は以下のものである。 In the coextruded multilayer film of the present invention, the surface layer (A), the intermediate layer (B), the intermediate layer (C) and the sealing layer (D) are (A) / (B) / (C) / (D). Although laminated in order, the resin used for each layer is as follows.
表面層（Ａ）は、融点１５０℃〜１７０℃のプロピレン系樹脂（ａ）を主成分とする樹脂層である。このプロピレン系樹脂（ａ）としては、例えば、プロピレン単独重合体；プロピレン−エチレンランダム共重合体、ポリエチレン−ポリプロピレンブロック共重合体、プロピレンとエチレン以外のα−オレフィンとのランダム共重合体等のプロピレン系共重合体などが挙げられる。これらのプロピレン系樹脂（ａ）は、前記表面層（Ａ）中に８０〜１００質量％含有（その他の樹脂は０〜２０質量％含有）することが好ましく、９５〜１００質量％含有（その他の樹脂は０〜５質量％含有）することがより好ましい。また、前記プロピレン系樹脂（ａ）の中でも、プロピレン単独重合体が好ましい。また、本発明で用いるプロピレン系樹脂（ａ）は、融点が１５０℃〜１７０℃のものであるが、融点が１５８〜１６５℃のものがより好ましい。 The surface layer (A) is a resin layer mainly composed of a propylene-based resin (a) having a melting point of 150 ° C. to 170 ° C. Examples of the propylene-based resin (a) include propylene homopolymer; propylene such as propylene-ethylene random copolymer, polyethylene-polypropylene block copolymer, and random copolymer of propylene and α-olefin other than ethylene. Examples thereof include system copolymers. These propylene resins (a) are preferably contained in the surface layer (A) in an amount of 80 to 100% by mass (other resins are contained in an amount of 0 to 20% by mass), and 95 to 100% by mass (others). More preferably, the resin is contained in an amount of 0 to 5% by mass. Among the propylene resins (a), a propylene homopolymer is preferable. The propylene resin (a) used in the present invention has a melting point of 150 ° C. to 170 ° C., more preferably a melting point of 158 to 165 ° C.
さらに、前記プロピレン系樹脂（ａ）に、耐熱性及び剛性を向上させるために、造核剤を配合する。この造核剤としては、プロピレン系樹脂に対して核となって結晶を成長させる効果を有するものであれば良く、例えば、パラ−ｔ−ブチル安息香酸−アルミニウム塩、安息香酸のナトリウム塩、安息香酸のカリウム塩等の有機カルボン酸の金属塩；３−メチルブテン−１、ビニルシクロアルカン等の重合体からなる高分子核剤などが挙げられる。これらの造核剤の中でも、３−メチルブテン−１の重合体からなる高分子核剤及びパラ−ｔ−ブチル安息香酸−アルミニウム塩は、耐熱性を大きく向上できるので好ましい。また、この高分子核剤の配合量としては、質量基準で１００〜８００ｐｐｍの範囲が好ましい。 Furthermore, a nucleating agent is blended with the propylene-based resin (a) in order to improve heat resistance and rigidity. Any nucleating agent may be used as long as it has an effect of growing a crystal as a nucleus with respect to the propylene-based resin. For example, para-t-butylbenzoic acid-aluminum salt, sodium salt of benzoic acid, benzoic acid Examples thereof include metal salts of organic carboxylic acids such as potassium salts of acids; polymer nucleating agents composed of polymers such as 3-methylbutene-1 and vinylcycloalkane. Among these nucleating agents, a polymer nucleating agent composed of a polymer of 3-methylbutene-1 and para-t-butylbenzoic acid-aluminum salt are preferable because they can greatly improve heat resistance. Further, the amount of the polymer nucleating agent is preferably in the range of 100 to 800 ppm on a mass basis.
中間層（Ｂ）は、直鎖状低密度ポリエチレン（ｂ）を主成分とする樹脂層である。直鎖状低密度ポリエチレン（ｂ）としては、密度が０．８８０〜０．９５０ｇ／ｃｍ３のものが挙げられ、特に、密度が０．９００〜０．９３０ｇ／ｃｍ３であるものが好ましい。 An intermediate | middle layer (B) is a resin layer which has a linear low density polyethylene (b) as a main component. Examples of the linear low density polyethylene (b) include those having a density of 0.880 to 0.950 g / cm 3 , and those having a density of 0.900 to 0.930 g / cm 3 are particularly preferable.
中間層（Ｂ）に用いる直鎖状低密度ポリエチレン（ｂ）は、主として、中圧法又は低圧法により製造される直鎖状エチレン−α−オレフィン共重合体である。この原料となるα−オレフィンとしては、炭素原子数３〜１２のα−オレフィンが好ましく、具体的にはプロピレン、ブテン−１、ペンテン−１、ヘキセン−１、オクテン−１、４−メチルペンテン−１等が挙げられる。直鎖状エチレン−α−オレフィン共重合体の密度は、エチレンとα−オレフィンとの比率を変化させることで調整することができる。 The linear low density polyethylene (b) used for the intermediate layer (B) is mainly a linear ethylene-α-olefin copolymer produced by an intermediate pressure method or a low pressure method. The α-olefin used as the raw material is preferably an α-olefin having 3 to 12 carbon atoms, specifically, propylene, butene-1, pentene-1, hexene-1, octene-1, 4-methylpentene- 1 etc. are mentioned. The density of the linear ethylene-α-olefin copolymer can be adjusted by changing the ratio of ethylene and α-olefin.
また、前記中間層（Ｂ）には、直鎖状低密度ポリエチレン（ｂ）以外に、低温衝撃強度を損なわない範囲で、その他の樹脂として、例えば、プロピレン系樹脂、プロピレン−α−オレフィン共重合体等のオレフィン系樹脂、オレフィン系樹脂フィルムの製造の際に発生するフィルム端部からなる回収物（以下、「回収物」という。）を用いることができる。 In addition to the linear low-density polyethylene (b), the intermediate layer (B) includes other resins such as a propylene-based resin and a propylene-α-olefin copolymer as long as the low-temperature impact strength is not impaired. A recovered material (hereinafter referred to as “recovered material”) consisting of an end portion of an olefin-based resin such as a coalescence or a film edge generated during the production of the olefin-based resin film can be used.
中間層（Ｃ）は、低密度ポリエチレン（ｃ１）及びエチレン−ブテン−１共重合体ラバー（ｃ２）からなる樹脂層である。低密度ポリエチレン（ｃ１）としては、密度が０．９１０〜０．９３０ｇ／ｃｍ３のものが挙げられ、特に、密度が０．９１５〜０．９２５ｇ／ｃｍ３であるものが好ましい。 The intermediate layer (C) is a resin layer composed of low-density polyethylene (c1) and ethylene-butene-1 copolymer rubber (c2). Examples of the low density polyethylene (c1) include those having a density of 0.910 to 0.930 g / cm 3 , and those having a density of 0.915 to 0.925 g / cm 3 are particularly preferable.
前記エチレン−ブテン−１共重合体ラバー（ｃ２）としては、ブテン−１由来成分の含有率が５〜２０質量％の共重合体であることが好ましく、７〜１５質量％の共重合体であることがより好ましい。また、エチレン−ブテン−１共重合体ラバー（ｃ２）の融点としては、６０〜１４５℃であることが好ましく、密度としては０．８９０〜０．９３０ｇ／ｃｍ３であることが好ましい。 The ethylene-butene-1 copolymer rubber (c2) is preferably a copolymer having a butene-1-derived content of 5 to 20% by mass, and a 7 to 15% by mass copolymer. More preferably. Moreover, as melting | fusing point of ethylene-butene-1 copolymer rubber (c2), it is preferable that it is 60-145 degreeC, and it is preferable that it is 0.890-0.930 g / cm < 3 > as a density.
また、前記中間層（Ｃ）で用いる前記低密度ポリエチレン（ｃ１）と前記エチレン−ブテン−１共重合体ラバー（ｃ２）との配合比としては、シール層（Ｄ）との層間接着強度が適度に低くすることで易開封性が付与でき、さらに適度なシール強度を保持できることから、質量比で（ｃ１）／（ｃ２）が６５／３５〜８５／１５であることが好ましく、８０／２０〜７０／３０であることがより好ましい。 Moreover, as a compounding ratio of the low density polyethylene (c1) and the ethylene-butene-1 copolymer rubber (c2) used in the intermediate layer (C), an interlayer adhesive strength with the seal layer (D) is appropriate. It is preferable that (c1) / (c2) is 65/35 to 85/15, and 80/20 to 80/20 in terms of mass ratio. More preferably, it is 70/30.
シール層（Ｄ）は、プロピレン−α−オレフィン共重合体（ｄ）を主成分とする樹脂層である。ここで用いるプロピレン−α−オレフィン共重合体（ｄ）としては、例えば、プロピレン−ブテン−１ランダム共重合体、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、ポリプロピレンとポリエチレンとからなるブロック共重合体等が挙げられる。これらプロピレン−α−オレフィン共重合体（ｄ）の中でも、低温シール性、剛性に優れるフィルムが得られることから、プロピレン−ブテン−１ランダム共重合体が好ましい。また、プロピレン−ブテン−１ランダム共重合体のブテン−１由来成分含有率は、１０〜３０重量％の範囲が好ましく、１５〜２５重量％の範囲がより好ましい。さらに、このプロピレン−α−オレフィン共重合体（ｄ）は、融点が１２５〜１４０℃の範囲のものが好ましい。 The seal layer (D) is a resin layer containing the propylene-α-olefin copolymer (d) as a main component. Examples of the propylene-α-olefin copolymer (d) used here include propylene-butene-1 random copolymer, propylene-ethylene random copolymer, propylene-ethylene-butene-1 random copolymer, polypropylene. And a block copolymer composed of polyethylene and polyethylene. Among these propylene-α-olefin copolymers (d), a propylene-butene-1 random copolymer is preferable because a film having excellent low-temperature sealing properties and rigidity can be obtained. Further, the content of the component derived from butene-1 in the propylene-butene-1 random copolymer is preferably in the range of 10 to 30% by weight, and more preferably in the range of 15 to 25% by weight. Further, the propylene-α-olefin copolymer (d) preferably has a melting point in the range of 125 to 140 ° C.
前記中間層（Ｃ）の厚さは、１．５〜４μｍが好ましく、特に包装袋の易開封性を向上するためには、１．０〜３．０μｍであることがより好ましい。また、前記ヒートシール層（Ｄ）の厚さは、２．０〜４．５μｍであるが、特に包装体の安定したシール強度と易開封性を向上するためには、２．５〜４．０μｍであることがより好ましい。 The thickness of the intermediate layer (C) is preferably 1.5 to 4 μm, and more preferably 1.0 to 3.0 μm in order to improve easy opening of the packaging bag. Moreover, although the thickness of the said heat seal layer (D) is 2.0-4.5 micrometers, especially in order to improve the stable sealing intensity | strength and easy-opening property of a package, 2.5-4. More preferably, it is 0 μm.
また、本発明の共押出多層フィルムの全体の厚さは、特に限定されないが、通常２０〜５０μｍが好ましく、中でも２５〜４０μｍがより好ましい。また、前記中間層（Ｃ）と前記シール層（Ｄ）の合計の厚さは、３〜８μｍが好ましいが、特に包装袋とした場合に適度なシール強度が得られ、易開封性も良好なフィルムが得られることから、中間層（Ｂ）とシール層（Ｃ）の合計の厚さは３〜５．５μｍであることがより好ましい。 The total thickness of the coextruded multilayer film of the present invention is not particularly limited, but is usually preferably 20 to 50 μm, and more preferably 25 to 40 μm. In addition, the total thickness of the intermediate layer (C) and the seal layer (D) is preferably 3 to 8 μm, but an appropriate seal strength can be obtained particularly when a packaging bag is used, and easy-openability is also good. Since a film is obtained, the total thickness of the intermediate layer (B) and the seal layer (C) is more preferably 3 to 5.5 μm.
さらに、本発明の共押出多層フィルムは、表面層（Ａ）／中間層（Ｂ）／中間層（Ｃ）／シール層（Ｄ）の順に積層された４層フィルムであるが、中間層（Ｂ）には共押出多層フィルムの製造の際に発生するフィルム端部からなる回収物を一部再利用する場合があるため、フィルム全体の厚さに対する中間層（Ｂ）の厚さの比率は、通常３０〜６５％が好ましく、さらに好ましくは３５〜５５％である。 Furthermore, the coextruded multilayer film of the present invention is a four-layer film laminated in the order of surface layer (A) / intermediate layer (B) / intermediate layer (C) / sealing layer (D). ) In some cases, the recovered material consisting of the film edge generated during the production of the coextruded multilayer film may be partially reused, so the ratio of the thickness of the intermediate layer (B) to the total film thickness is: Usually, 30 to 65% is preferable, and 35 to 55% is more preferable.
本発明の共押出多層フィルムは、そのまま用いても良いが、印刷適性を向上のために表面層（Ａ）にコロナ放電処理をしても良い。また、本発明の共押出多層フィルムの各層の中には、必要に応じて酸化防止剤、スリップ剤、アンチブロッキング剤、防曇剤、着色剤、シリカなどの添加剤等を適宜添加しても良い。 The coextruded multilayer film of the present invention may be used as it is, but the surface layer (A) may be subjected to corona discharge treatment in order to improve printability. Moreover, in each layer of the coextruded multilayer film of the present invention, additives such as an antioxidant, a slip agent, an antiblocking agent, an antifogging agent, a colorant, and silica may be appropriately added as necessary. good.
本発明の共押出多層フィルムの製造方法は、共押出成形法であればよく、特に限定されないが、例えば、３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ィルムに加工する方法が好ましい。 The production method of the coextruded multilayer film of the present invention may be a coextrusion molding method, and is not particularly limited. For example, the coextrusion multilayer die method, feed block method, in which melt extrusion is performed using three or more extruders. After being laminated in a molten state by a known coextrusion method such as the above, a method of processing into a long wound film by a method such as inflation or a T-die / chill roll method is preferred.
以下に実施例及び比較例を挙げて、本発明を更に具体的に説明する。なお、例中の部及び％は、特に断りのない限りすべて質量基準である（ただし、１％接線モジュラスを除く。）。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. In the examples, all parts and% are based on mass unless otherwise specified (excluding 1% tangent modulus).
（実施例１）
表面層（Ａ）用樹脂として、プロピレン単独重合体（以下、「ＨＯＰＰ」という。）〔密度：０．９００ｇ／ｃｍ３、融点：１６２℃、ＭＦＲ（測定温度２３０℃、荷重２１．１８Ｎ）：９ｇ／１０分〕に、造核剤として３−メチルブテン−１の重合体を質量基準で４００ｐｐｍを添加した混合物を用いた。また、中間層（Ｂ）用樹脂として、直鎖状エチレン−αオレフィン共重合体（以下、「ＬＬＤＰＥ」という。）〔密度：０．９２０ｇ／ｃｍ３、ＭＦＲ（測定温度１９０℃、荷重２１．１８Ｎ）：４ｇ／１０分〕を用いた。中間層（Ｃ）用樹脂として、低密度ポリエチレン（以下、「ＬＤＰＥ」という。）〔密度：０．９１０ｇ／ｃｍ３、ＭＦＲ（測定温度１９０℃、荷重２１．１８Ｎ）：８ｇ／１０分〕７０部と、エチレン−ブテン−１ランダム共重合体（以下、「ＥＢＲ」という。）〔ブテン−１由来成分含有率：１０％、密度：０．８８０ｇ／ｃｍ３、融点：６７℃、ＭＦＲ（測定温度１９０℃、荷重２１．１８Ｎ）：３．５ｇ／１０分〕３０部との混合物を用いた。さらに、シール層（Ｄ）用樹脂として、プロピレン−ブテン１共重合体〔ブテン１由来成分含率：２３．０％、密度：０．９００ｇ／ｃｍ３、融点：１３２℃、ＭＦＲ（測定温度２３０℃、荷重２１．１８Ｎ）：７ｇ／１０分〕用いた。各層用樹脂をそれぞれ４台の押出機に供給し、表面層（Ａ）、中間層（Ｂ）及び（Ｃ）、シール層（Ｄ）の平均厚さが、それぞれ１２μｍ、１２μｍ、２．４μｍ及び３．６μｍとなるように共押出して、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、共押出多層フィルムの表面層（Ａ）の表面を、表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
Example 1
As a resin for the surface layer (A), a propylene homopolymer (hereinafter referred to as “HOPP”) [density: 0.900 g / cm 3 , melting point: 162 ° C., MFR (measurement temperature 230 ° C., load 21.18 N): 9 g / 10 min], a mixture obtained by adding 400 ppm of 3-methylbutene-1 polymer as a nucleating agent on a mass basis was used. Further, as the resin for the intermediate layer (B), a linear ethylene-α-olefin copolymer (hereinafter referred to as “LLDPE”) [density: 0.920 g / cm 3 , MFR (measurement temperature 190 ° C., load 21. 18N): 4 g / 10 min] was used. Low density polyethylene (hereinafter referred to as “LDPE”) [density: 0.910 g / cm 3 , MFR (measurement temperature 190 ° C., load 21.18 N): 8 g / 10 min] as the resin for the intermediate layer (C) Part, ethylene-butene-1 random copolymer (hereinafter referred to as “EBR”) [butene-1-derived component content: 10%, density: 0.880 g / cm 3 , melting point: 67 ° C., MFR (measurement] Temperature 190 ° C., Load 21.18 N): 3.5 g / 10 min] A mixture with 30 parts was used. Further, as a resin for the sealing layer (D), propylene-butene 1 copolymer [butene 1-derived component content: 23.0%, density: 0.900 g / cm 3 , melting point: 132 ° C., MFR (measurement temperature 230 ° C, load 21.18 N): 7 g / 10 min]. The resin for each layer is supplied to each of four extruders, and the average thicknesses of the surface layer (A), the intermediate layers (B) and (C), and the seal layer (D) are 12 μm, 12 μm, 2.4 μm and Co-extruded to 3.6 μm to obtain a co-extruded multilayer film consisting of 4 layers with a thickness of 30 μm. Next, the surface of the surface layer (A) of the coextruded multilayer film was subjected to corona discharge treatment so that the surface energy was 36 mN / m.
（実施例２）
実施例１の中間層（Ｃ）の混合比率を、ＬＤＰＥ８０部／ＥＢＲ２０部に代え以外は実施例１と同様に行い、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Example 2)
The mixing ratio of the intermediate layer (C) in Example 1 was changed in the same manner as in Example 1 except that 80 parts of LDPE / 20 parts of EBR was used to obtain a co-extruded multilayer film consisting of 4 layers having a thickness of 30 μm. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment in the same manner as in Example 1 so that the surface energy was 36 mN / m.
（実施例３）
実施例１のシール層（Ｄ）として用いたプロピレン−ブテン１共重合体の代わりに、プロピレン−エチレン−ブテン−１ランダム共重合体〔エチレン由来成分含率：４．５％、ブテン１由来成分含率：４．０％、密度：０．９００ｇ／ｃｍ３、融点：１２７℃、ＭＦＲ（測定温度２３０℃、荷重２１．１８Ｎ）：７ｇ／１０分〕を用いた以外は、実施例１と同様に行い、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した
(Example 3)
Instead of the propylene-butene 1 copolymer used as the seal layer (D) of Example 1, a propylene-ethylene-butene-1 random copolymer [ethylene-derived component content: 4.5%, butene 1-derived component Content ratio: 4.0%, density: 0.900 g / cm 3 , melting point: 127 ° C., MFR (measurement temperature 230 ° C., load 21.18 N): 7 g / 10 min] The same procedure was followed to obtain a coextruded multilayer film consisting of 4 layers with a thickness of 30 μm. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment so that the surface energy was 36 mN / m as in Example 1.
（比較例１）
実施例１の中間層（Ｃ）の混合比率を、ＬＤＰＥ６０部／ＥＢＲ４０部に代えた以外は実施例１と同様に行い、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Comparative Example 1)
The same procedure as in Example 1 was carried out except that the mixing ratio of the intermediate layer (C) in Example 1 was changed to 60 parts LDPE / 40 parts EBR to obtain a coextruded multilayer film consisting of 4 layers of 30 μm thickness. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment in the same manner as in Example 1 so that the surface energy was 36 mN / m.
（比較例２）
実施例１の中間層（Ｃ）の混合比率を、ＬＤＰＥ９０部／ＥＢＲ１０部に代え以外は実施例１と同様に行い、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Comparative Example 2)
The same procedure as in Example 1 was conducted except that the mixing ratio of the intermediate layer (C) in Example 1 was changed to 90 parts of LDPE / 10 parts of EBR, to obtain a coextruded multilayer film consisting of 4 layers having a thickness of 30 μm. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment in the same manner as in Example 1 so that the surface energy was 36 mN / m.
（比較例３）
実施例１の中間層（Ｃ）を除き、表面層（Ａ）、中間層（Ｂ）、シール層（Ｄ）の３層構成とし、表面層（Ａ）、中間層（Ｂ）、シール層（Ｄ）の平均厚さが、それぞれ１３．５μｍ、１２μｍ、４．５μｍとなるように共押出して、厚さ３０μｍの３層からなる共押出多層フィルムを得た。次いで、共押出多層フィルムの表面層（Ａ）の表面を、表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Comparative Example 3)
Except for the intermediate layer (C) of Example 1, the surface layer (A), the intermediate layer (B), and the seal layer (D) have a three-layer structure. The surface layer (A), the intermediate layer (B), and the seal layer ( Co-extrusion was carried out so that the average thicknesses of D) were 13.5 μm, 12 μm, and 4.5 μm, respectively, to obtain a coextruded multilayer film having three layers of 30 μm thickness. Next, the surface of the surface layer (A) of the coextruded multilayer film was subjected to corona discharge treatment so that the surface energy was 36 mN / m.
（比較例４）
実施例１で中間層（Ｂ）として用いたＬＬＤＰＥに代え、ＨＯＰＰ〔密度：０．９００ｇ／ｃｍ３、融点：１６２℃、ＭＦＲ（測定温度２３０℃、荷重２１．１８Ｎ）：９ｇ／１０分〕を用いた以外は、同一の樹脂を使用した。各層用樹脂をそれぞれ４台の押出機に供給し、表面層（Ａ）、中間層（Ｂ）及び（Ｃ）、シール層（Ｄ）の平均厚さが、それぞれ６μｍ、２１μｍ、１．５μｍ及び１．５μｍとなるように共押出して、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Comparative Example 4)
Instead of LLDPE used as the intermediate layer (B) in Example 1, HOPP [density: 0.900 g / cm 3 , melting point: 162 ° C., MFR (measurement temperature 230 ° C., load 21.18 N): 9 g / 10 min] The same resin was used except that was used. The resin for each layer is supplied to each of four extruders, and the average thicknesses of the surface layer (A), the intermediate layers (B) and (C), and the seal layer (D) are 6 μm, 21 μm, 1.5 μm and Co-extruded to a thickness of 1.5 μm to obtain a co-extruded multilayer film consisting of 4 layers with a thickness of 30 μm. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment in the same manner as in Example 1 so that the surface energy was 36 mN / m.
（比較例５）
実施例２の表面層（Ａ）とした用いたＨＯＰＰに代え、プロピレン−エチレンランダム共重合体（以下、「ＣＯＰＰ」という。）〔密度：０．９００ｇ／ｃｍ３、融点：１４０℃、ＭＦＲ（測定温度２３０℃、荷重２１．１８Ｎ）：９ｇ／１０分〕を用いた以外は、同一の樹脂を使用した。各層用樹脂をそれぞれ４台の押出機に供給し、表面層（Ａ）、中間層（Ｂ）及び（Ｃ）、シール層（Ｄ）の平均厚さが、それぞれ６μｍ、２１μｍ、１．５μｍ及び１．５μｍとなるように共押出して、厚さ３０μｍの４層からなる共押出多層フィルムを得た。次いで、得られた共押出多層フィルムの表面層（Ａ）の表面を、実施例１と同様に表面エネルギーが３６ｍＮ／ｍになるようにコロナ放電処理を施した。
(Comparative Example 5)
Instead of the HOPP used as the surface layer (A) of Example 2, a propylene-ethylene random copolymer (hereinafter referred to as “COPP”) [density: 0.900 g / cm 3 , melting point: 140 ° C., MFR ( The same resin was used except that the measurement temperature was 230 ° C. and the load was 21.18 N): 9 g / 10 min. The resin for each layer is supplied to each of four extruders, and the average thicknesses of the surface layer (A), the intermediate layers (B) and (C), and the seal layer (D) are 6 μm, 21 μm, 1.5 μm and Co-extruded to a thickness of 1.5 μm to obtain a co-extruded multilayer film consisting of 4 layers with a thickness of 30 μm. Next, the surface of the surface layer (A) of the obtained coextruded multilayer film was subjected to corona discharge treatment in the same manner as in Example 1 so that the surface energy was 36 mN / m.
実施例、比較例で得られた共押出多層フィルムについて、シール強度、易開封性、衝撃強度（耐寒性）、剛性（１％接線モジュラス）、包装適性の評価を、以下のように行った。 About the co-extrusion multilayer film obtained by the Example and the comparative example, sealing strength, easy-open property, impact strength (cold resistance), rigidity (1% tangent modulus), and packaging suitability were evaluated as follows.
（シール強度の測定及び評価）
上記で得られた共押出多層フィルムの２枚をシール層同士が接するように重ね合わせ、温度１３０℃、１４０℃、圧力０．２ＭＰａで幅１０ｍｍのシールバーにより、１．０秒間ヒートシールした後、放冷し、次いでヒートシールしたフィルムから１５ｍｍ幅の試験片を切り取り、２３℃、引張速度３００ｍｍ／分の条件で、テンシロン引張試験機〔株式会社エー・アンド・デー製〕で引き剥がす時の最大荷重を測定し、その最大荷重をシール強度（単位：Ｎ／１５ｍｍ）とした。また、シール強度は、開封性が良好な場合でも、一定数値以上のシール強度が無ければ、商品陳列あるいは輸送時にシール部が開封し、シール不良となる場合がある。そこで、充分な数値を保持したシール強度として、上記測定で得た値から、次の基準で評価した
○：シール強度数値が２．０Ｎ／１５ｍｍ以上のもの。
×：シール強度数値が２．０Ｎ／１５ｍｍ未満のもの。
(Measurement and evaluation of seal strength)
After two layers of the co-extruded multilayer film obtained above were overlapped so that the seal layers were in contact with each other and heat sealed for 1.0 second with a seal bar having a width of 10 mm at a temperature of 130 ° C., 140 ° C. and a pressure of 0.2 MPa. A 15 mm wide test piece was cut out from the film that was allowed to cool and then heat-sealed, and was peeled off with a Tensilon tensile tester (manufactured by A & D Co., Ltd.) at 23 ° C. and a tensile speed of 300 mm / min. The maximum load was measured, and the maximum load was defined as the seal strength (unit: N / 15 mm). Further, even if the seal strength is good, if the seal strength is not more than a certain value, the seal portion may be opened during product display or transportation, resulting in a seal failure. Therefore, as the seal strength with a sufficient value, the value obtained by the above measurement was evaluated according to the following criteria: ○: The seal strength value is 2.0 N / 15 mm or more.
X: The seal strength value is less than 2.0 N / 15 mm.
（易開封性）
上記で得られた共押出多層フィルムを用い、シール層が内側になるようにして横ピロー包装機〔フジキカイ株式会社製「ＦＷ−３４００／Ｂ αＶ」〕にセットし、底部の上シールバー温度１４０℃、下シールバー温度１４０℃、センター（背貼り部）シール温度を１４０℃、製袋速度６０個／分の条件で、ピロー包装袋（縦１８０ｍｍ、横１５０ｍｍ）を作製した。この包装袋について易開封性について次の基準で評価した。
○：手で簡単に開封可能なもの。
×：手で開封が不可能なもの。
(Easy opening)
Using the coextruded multilayer film obtained above, set in a horizontal pillow wrapping machine (“FW-3400 / B αV” manufactured by Fujikikai Co., Ltd.) with the seal layer on the inside, and the upper seal bar temperature at the bottom 140 Pillow packaging bags (180 mm long, 150 mm wide) were prepared under the conditions of ℃, lower seal bar temperature of 140 ℃, center (back bonding part) seal temperature of 140 ℃, and bag making speed of 60 pieces / min. The easy-openability of this packaging bag was evaluated according to the following criteria.
○: Can be easily opened by hand.
X: What cannot be opened by hand.
（衝撃強度の測定及び耐寒性の評価）
上記で得られた共押出多層フィルムを用い、２３℃または０℃に状態調整された恒温室内で、サンプルを６時間保持した後、直径２５．４ｍｍの球状の衝撃頭を用いてフィルムインパクト法で測定した。また、当フィルムを低温下で使用した場合、一定数値以上の衝撃強度を保持していなければ、結束時または輸送時に、破袋の問題を引き起こす可能性がある。そこで、耐寒性として、上記測定で得た値から、次の基準で評価した。
○：衝撃強度（０℃）が０．１５Ｎ／１５ｍｍ以上のもの。
×：衝撃強度（０℃）が０．１５Ｎ／１５ｍｍ未満のもの。
(Measurement of impact strength and evaluation of cold resistance)
Using the coextruded multilayer film obtained above, the sample was held for 6 hours in a temperature-controlled room adjusted to 23 ° C. or 0 ° C., and then a film impact method using a spherical impact head having a diameter of 25.4 mm. It was measured. Further, when the film is used at a low temperature, it may cause a problem of bag breakage at the time of bundling or transportation unless the impact strength of a certain value or more is maintained. Therefore, the cold resistance was evaluated according to the following criteria from the values obtained by the above measurement.
○: Impact strength (0 ° C.) of 0.15 N / 15 mm or more.
X: Impact strength (0 ° C.) is less than 0.15 N / 15 mm.
（剛性の測定）
ＡＳＴＭ Ｄ−８８２に基づき、２３℃における１％接線モジュラス（単位：ＭＰａ）を、フィルム製造時の押出方向（以下、「ＭＤ」という。）について、テンシロン引張試験機〔株式会社エー・アンド・デー製〕を用いて測定した。
(Measurement of rigidity)
Based on ASTM D-882, a 1% tangential modulus (unit: MPa) at 23 ° C. was measured with respect to the extrusion direction at the time of film production (hereinafter referred to as “MD”). Measured using
（包装適性の評価）
上記で得られた共押出多層フィルムを前記横ピロー包装機で包装する場合、横ピロー包装機でフィルムを送る際に、フィルムが一定以上の剛性（１％接線モジュラス）を有していないと、センターシールのズレやのシワの発生により、包装不良が発生しやすくなる。そこで、包装適性を、上記で得た１％接線モジュラスの値から、以下の基準で評価した。
○：１％接線モジュラスが６００ＭＰａ以上のもの。
×：１％接線モジュラスが６００ＭＰａ未満のもの。
(Evaluation of packaging suitability)
When packaging the coextruded multilayer film obtained above with the horizontal pillow packaging machine, when the film is sent with the horizontal pillow packaging machine, the film does not have a certain level of rigidity (1% tangential modulus), Due to the center seal misalignment and wrinkles, packaging defects are likely to occur. Therefore, packaging suitability was evaluated according to the following criteria from the value of the 1% tangent modulus obtained above.
○: 1% tangent modulus is 600 MPa or more.
X: 1% tangent modulus is less than 600 MPa.
上記の測定及び評価で得られた結果を表１に示す。 Table 1 shows the results obtained from the above measurements and evaluations.
表１に示した結果から以下のことが分かった。 The following was found from the results shown in Table 1.
実施例１、２及び３は、本発明の共押出多層フィルムを用いた例であるが、充分なヒートシール強度を有し、易開封性が良好で、耐寒性と剛性のバランスに優れ、包装適性が良好であることが分かった。 Examples 1, 2 and 3 are examples using the coextruded multilayer film of the present invention, which has sufficient heat seal strength, good openability, excellent balance between cold resistance and rigidity, packaging The aptitude was found to be good.
比較例１は、実施例１から中間層（Ｃ）の混合比率を、本願規定の範囲外であるＬＤＰＥ６０部／ＥＢＲ４０部に代えた共押出多層フィルムの例であるが、シール強度がやや高く、易開封性が不充分であることが分かった。 Comparative Example 1 is an example of a coextruded multilayer film in which the mixing ratio of the intermediate layer (C) from Example 1 is replaced with LDPE 60 parts / EBR 40 parts outside the scope of the present application, but the sealing strength is slightly high, It was found that the easy-openability was insufficient.
比較例２は、実施例１から中間層（Ｃ）の混合比率を、本願規定の範囲外であるＬＤＰＥ９０部／ＥＢＲ１０部に代えた共押出多層フィルムの例であるが、シール強度が低いことが分かった。 Comparative Example 2 is an example of a co-extruded multilayer film in which the mixing ratio of the intermediate layer (C) from Example 1 is replaced with 90 parts of LDPE / 10 parts of EBR that is outside the scope of the present application, but the seal strength is low. I understood.
比較例３は、実施例１の中間層（Ｃ）を除き、表面層（Ａ）、中間層（Ｂ）、シール層（Ｄ）の３層構成とした例であるが、シール強度が高く過ぎ、易開封性が不充分であることが分かった。 Comparative Example 3 is an example in which the surface layer (A), the intermediate layer (B), and the seal layer (D) have a three-layer structure except for the intermediate layer (C) of Example 1, but the seal strength is too high. It was found that the ease of opening was insufficient.
比較例４は、実施例１で中間層（Ｂ）として用いたＬＬＤＰＥに代え、ＨＯＰＰを使用した例であるが、衝撃強度が低く、耐寒性が不充分であることが分かった。 In Comparative Example 4, HOPP was used instead of LLDPE used as the intermediate layer (B) in Example 1, but it was found that the impact strength was low and the cold resistance was insufficient.
比較例５は、実施例１で表面層（Ａ）として用いたＨＯＰＰに代え、ＣＯＰＰを使用した例であるが、剛性が低く、包装適性が不充分であることが分かった。 Comparative Example 5 is an example in which COPP was used instead of HOPP used as the surface layer (A) in Example 1, but it was found that the rigidity was low and packaging suitability was insufficient.
Claims (5)
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| JP2015507565A (en) * | 2011-12-28 | 2015-03-12 | ダウ グローバル テクノロジーズ エルエルシー | Film extrusion seal that can be retorted and easily opened |
| CN110128700A (en) * | 2019-05-31 | 2019-08-16 | 上海欣鑫化工有限公司 | A kind of organic carboxyl acid salt nucleating agent and its preparation process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0899393A (en) * | 1994-09-29 | 1996-04-16 | Kohjin Co Ltd | Polyolefinic heat-shrinkable laminated film |
| JP2005305859A (en) * | 2004-04-22 | 2005-11-04 | Dainippon Ink & Chem Inc | Coextruded multilayered film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0899393A (en) * | 1994-09-29 | 1996-04-16 | Kohjin Co Ltd | Polyolefinic heat-shrinkable laminated film |
| JP2005305859A (en) * | 2004-04-22 | 2005-11-04 | Dainippon Ink & Chem Inc | Coextruded multilayered film |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015507565A (en) * | 2011-12-28 | 2015-03-12 | ダウ グローバル テクノロジーズ エルエルシー | Film extrusion seal that can be retorted and easily opened |
| CN110128700A (en) * | 2019-05-31 | 2019-08-16 | 上海欣鑫化工有限公司 | A kind of organic carboxyl acid salt nucleating agent and its preparation process |
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