JP2002370327A - Polyethylene multilayered heat-shrinkable film - Google Patents
Polyethylene multilayered heat-shrinkable filmInfo
- Publication number
- JP2002370327A JP2002370327A JP2001184464A JP2001184464A JP2002370327A JP 2002370327 A JP2002370327 A JP 2002370327A JP 2001184464 A JP2001184464 A JP 2001184464A JP 2001184464 A JP2001184464 A JP 2001184464A JP 2002370327 A JP2002370327 A JP 2002370327A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene resin
- density
- density polyethylene
- linear
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 32
- -1 Polyethylene Polymers 0.000 title claims abstract description 29
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 28
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 110
- 239000011347 resin Substances 0.000 claims abstract description 110
- 239000002344 surface layer Substances 0.000 claims abstract description 25
- 239000012792 core layer Substances 0.000 claims abstract description 23
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 3
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 43
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 39
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 34
- 229920004889 linear high-density polyethylene Polymers 0.000 claims description 26
- 239000004708 Very-low-density polyethylene Substances 0.000 claims description 22
- 229920001866 very low density polyethylene Polymers 0.000 claims description 22
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000005977 Ethylene Substances 0.000 claims 1
- 229920001684 low density polyethylene Polymers 0.000 abstract description 5
- 239000004702 low-density polyethylene Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 9
- 229920013716 polyethylene resin Polymers 0.000 description 9
- 239000011342 resin composition Substances 0.000 description 8
- 239000000155 melt Substances 0.000 description 5
- 239000004711 α-olefin Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920005678 polyethylene based resin Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000015111 chews Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920005679 linear ultra low density polyethylene Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリエチレン系樹
脂からなる多層構成の熱収縮性フィルムに関するもので
ある。具体的には、両表面層と芯層を構成する直鎖状ポ
リエチレン系樹脂の組成を特定した、延伸加工性が良好
で、しかも、耐熱性と低収縮応力性に優れたポリエチレ
ン系多層熱収縮性フィルムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer heat-shrinkable film made of a polyethylene resin. Specifically, the composition of the linear polyethylene-based resin constituting both the surface layer and the core layer was specified, and the polyethylene-based multilayer heat shrinkage having good stretchability and excellent heat resistance and low shrinkage stress. It relates to a functional film.
【０００２】[0002]
【従来の技術】ポリエチレン系樹脂を延伸加工してなる
多層熱収縮性フィルムは、熱収縮包装用として広く一般
に使用されている。そして、該フィルムは、ポリプロピ
レン系樹脂等を延伸加工して得られた熱収縮性フィルム
と比較し、熱収縮応力が弱いことが知られている。尚、
熱収縮応力の弱い熱収縮性フィルムは、熱収縮包装する
際、被包装物に強い外力を加えないので、熱収縮包装時
に湾曲や変形を生じ易い商品、例えば、ノートやカード
等の熱収縮包装に好適に使用されている。2. Description of the Related Art A multilayer heat-shrinkable film obtained by stretching a polyethylene resin is widely and generally used for heat-shrinkable packaging. It is known that the film has a lower heat shrinkage stress than a heat shrinkable film obtained by stretching a polypropylene resin or the like. still,
A heat-shrinkable film having a low heat-shrinkage stress does not apply a strong external force to an object to be packaged at the time of heat-shrinkage packaging. It is suitably used for
【０００３】又、ポリエチレン系熱収縮性フィルムは、
耐熱性に劣るので、表面層に融点の高いポリエチレン系
樹脂を、芯層に融点の低いポリエチレン系樹脂を用いた
多層構成のポリエチレン系熱収縮性フィルムが知られて
いる。尚、耐熱性に優れたポリエチレン系多層熱収縮性
フィルムは、熱収縮トンネル内等で熱収縮させる際に溶
融したり白化したりし難いので、十分な熱収縮を施すこ
とができ、良好な熱収縮包装体を得ることができる。[0003] Further, a polyethylene-based heat-shrinkable film is
A heat-shrinkable polyethylene film having a multilayer structure using a polyethylene resin having a high melting point for the surface layer and a polyethylene resin having a low melting point for the core layer is known because of its poor heat resistance. In addition, since the polyethylene-based multilayer heat-shrinkable film having excellent heat resistance is unlikely to melt or whiten when heat-shrinked in a heat-shrink tunnel or the like, sufficient heat-shrinkage can be performed, and good heat shrinkage can be performed. A shrink wrap can be obtained.
【０００４】しかし、ポリエチレン系樹脂は、ポリプロ
ピレン系樹脂と比較して延伸加工適性に劣るので、熱収
縮性フィルムを得ることが困難であった。具体的には、
延伸適性温度範囲が狭く、長時間安定して延伸加工を施
すことが困難であった。上記した表面層に融点の高いポ
リエチレン系樹脂を、芯層に融点の低いポリエチレン系
樹脂を用いた多層構成の熱収縮性フィルムにおいても、
延伸加工性は良好なものではなかった。[0004] However, it is difficult to obtain a heat-shrinkable film because polyethylene-based resins are inferior in stretchability to polypropylene-based resins. In particular,
The suitable temperature range for stretching was narrow, and it was difficult to stably perform stretching for a long time. Polyethylene resin having a high melting point for the surface layer, even in a heat-shrinkable film having a multilayer structure using a polyethylene resin having a low melting point for the core layer,
The stretching processability was not good.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、熱収縮性を
付与させるための延伸加工性が良好で、しかも、耐熱性
と低収縮応力性に優れたポリエチレン系多層熱収縮性フ
ィルムを提供しようとするものである。更に具体的に
は、延伸適性温度範囲を広くして長時間安定した延伸加
工ができ、又、熱収縮トンネル内等の熱風に曝しても溶
融したり白化したりし難く、しかも、熱収縮包装時に被
包装物に外力が加わらない、耐熱性と低収縮応力性を有
するポリエチレン系多層熱収縮性フィルムを提供しよう
とするものである。The object of the present invention is to provide a polyethylene-based multilayer heat-shrinkable film which has good stretchability for imparting heat shrinkage, and is excellent in heat resistance and low shrinkage stress. It is assumed that. More specifically, the stretching temperature range is widened so that a stable stretching process can be performed for a long time, and it is hard to melt or whiten even when exposed to hot air in a heat shrink tunnel. An object of the present invention is to provide a polyethylene-based multilayer heat-shrinkable film having heat resistance and low shrinkage stress, in which an external force is not sometimes applied to an article to be packaged.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記課題を解
決するために、次のような手段を講じた。即ち、表面層
（Ｆ１，Ｆ２）が、密度（ＤＡ）０．９１０乃至０．９
３０ｇ／ｃｍ３の直鎖状低密度ポリエチレン樹脂（Ａ）
と、密度（ＤＣ）０．９２５乃至０．９４５ｇ／ｃｍ３
の直鎖状高密度ポリエチレン樹脂（Ｃ）からなり、芯層
（Ｍ１）が密度（ＤＡ）０．９１０乃至０．９３０ｇ／
ｃｍ３の直鎖状低密度ポリエチレン樹脂（Ａ）と密度
（ＤＢ）０．８８乃至０．９１５ｇ／ｃｍ３の直鎖状極
低密度ポリエチレン樹脂（Ｂ）からなり、しかも、下記
条件を満足させる。 （ａ）ＤＡＭ１−ＤＢＭ１≧０．０１０、しかも、Ｄ
ＣＦ１−ＤＡＦ１≧０．０１０、しかも、ＤＣＦ２−Ｄ
ＡＦ２≧０．０１０、しかも、（ｂ）０．０１≦｛（Ｄ
ＣＦ１−ＤＡＦ１）×ＬＦ１×ＷＣＦ１｝＋｛（ＤＣ
Ｆ２−ＤＡＦ２）×ＬＦ２×ＷＣＦ２｝≦０．２０、し
かも ０．４０＜（ＤＡＭ１−ＤＢＭ１）×ＬＭ１×ＷＢＭ１
≦１．６ 但し、 ＤＡ：直鎖状低密度ポリエチレン樹脂（Ａ）の密度（ｇ
／ｃｍ３） ＤＢ：直鎖状極低密度ポリエチレン樹脂（Ｂ）の密度
（ｇ／ｃｍ３） ＤＣ：直鎖状低高度ポリエチレン樹脂（Ｃ）の密度（ｇ
／ｃｍ３） ＤＡＭ１：Ｍ１層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＢＭ１：Ｍ１層の直鎖状極低密度ポリエチレン樹脂
（Ｂ）の密度（ｇ／ｃｍ ３） ＤＡＦ１：Ｆ１層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＡＦ２：Ｆ２層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＣＦ１：Ｆ１層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の密度（ｇ／ｃｍ３） ＤＣＦ２：Ｆ２層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の密度（ｇ／ｃｍ３） ＬＭ１：Ｍ１層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＬＦ１：Ｆ１層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＬＦ２：Ｆ２層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＷＢＭ１：Ｍ１層の直鎖状極低密度ポリエチレン樹脂
（Ｂ）の重量割合（ｗｔ％） ＷＣＦ１：Ｆ１層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の重量割合（ｗｔ％） ＷＣＦ２：Ｆ２層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の重量割合（ｗｔ％）The present invention solves the above problems.
In order to decide, the following measures were taken. That is, the surface layer
(F1, F2) is the density (DA) 0.910 to 0.9
30g / cm3Linear low density polyethylene resin (A)
And the density (DC) 0.925 to 0.945 g / cm3
Made of linear high-density polyethylene resin (C)
(M1) is the density (DA) 0.910 to 0.930 g /
cm3Linear low density polyethylene resin (A) and its density
(DB) 0.88 to 0.915 g / cm3Linear pole of
Made of low-density polyethylene resin (B), and
Satisfy the conditions. (A) DAM1-DBM1≧ 0.010, and D
CF1-DAF1≧ 0.010, and DCF2-D
AF2≧ 0.010 and (b) 0.01 ≦ ｛(D
CF1-DAF1) × LF1× WCF1｝ + ｛(DC
F2-DAF2) × LF2× WCF2｝ ≦ 0.20, then
0.40 <(DAM1-DBM1) × LM1× WBM1
≦ 1.6 where DA: Density of linear low density polyethylene resin (A) (g)
/ Cm3) DB: Density of linear very low density polyethylene resin (B)
(G / cm3) DC: Density of linear low-altitude polyethylene resin (C) (g
/ Cm3) DAM1: Linear low density polyethylene resin of M1 layer
Density of (A) (g / cm3) DBM1: Linear very low density polyethylene resin of M1 layer
Density of (B) (g / cm 3) DAF1: Linear low density polyethylene resin of F1 layer
Density of (A) (g / cm3) DAF2: Linear low density polyethylene resin of F2 layer
Density of (A) (g / cm3) DCF1: Linear high density polyethylene resin of F1 layer
Density of (C) (g / cm3) DCF2: F2 layer linear high-density polyethylene resin
Density of (C) (g / cm3) LM1: Thickness ratio of M1 layer to total layer thickness (total layer thickness
(Ratio to “1”) LF1: Thickness ratio of F1 layer to total layer thickness (total layer thickness)
(Ratio to “1”) LF2: Thickness ratio of F2 layer to total layer thickness (total layer thickness)
Ratio to "1") WBM1: Linear very low density polyethylene resin of M1 layer
Weight ratio (wt%) of (B) WCF1: Linear high density polyethylene resin of F1 layer
(C) weight ratio (wt%) WCF2: F2 layer linear high-density polyethylene resin
Weight ratio of (C) (wt%)
【０００７】[0007]
【発明の実施態様】まず、本発明のポリエチレン系多層
熱収縮性フィルムに用いられる直鎖状低密度ポリエチレ
ン樹脂（Ａ）は、αオレフィンが炭素数４乃至８のエチ
レン−αオレフィン共重合体である。そして、該樹脂
（Ａ）の密度（ＤＡ）は、０．９１０乃至０．９３０ｇ
／ｃｍ３の範囲内であることが必要である。そして、該
直鎖状低密度ポリエチレン樹脂（Ａ）のメルトインデッ
クスとては、熱収縮性を付与させるための延伸加工性の
面から０．５乃至５．０ｇ／１０ｍｉｎの範囲内のもの
が好ましい。尚、該直鎖状低密度ポリエチレン樹脂
（Ａ）には、従来のチグラーナッタ触媒を用いて重合さ
れた樹脂は勿論、シングルサイト系触媒を用いて重合さ
れた樹脂も含まれる。First, the linear low-density polyethylene resin (A) used for the polyethylene-based multilayer heat-shrinkable film of the present invention is an ethylene-α-olefin copolymer having an α-olefin of 4 to 8 carbon atoms. is there. Then, the density of the resin (A) (D A) is 0.910 to 0.930g
/ Cm 3 . The melt index of the linear low-density polyethylene resin (A) is preferably in the range of 0.5 to 5.0 g / 10 min from the viewpoint of stretchability for imparting heat shrinkability. . In addition, the linear low-density polyethylene resin (A) includes not only a resin polymerized using a conventional Ziegler-Natta catalyst but also a resin polymerized using a single-site catalyst.
【０００８】次に、本発明のポリエチレン系多層熱収縮
性フィルムに用いられる直鎖状極低密度ポリエチレン樹
脂（Ｂ）は、上記直鎖状低密度ポリエチレン樹脂（Ａ）
と混合させる樹脂であり、αオレフィンが炭素数４乃至
８のエチレン−αオレフィン共重合体である。そして、
該樹脂（Ｂ）の密度（ＤＢ）は、０．８８０乃至０．９
１５ｇ／ｃｍ３の範囲内であることが必要である。そし
て、該直鎖状極低密度ポリエチレン樹脂（Ｂ）のメルト
インデックスは、前記直鎖状低密度ポリエチレン樹脂
（Ａ）との相溶性や熱収縮性を付与させるための延伸加
工性等を考慮して、直鎖状低密度ポリエチレン樹脂
（Ａ）のメルトインデックス値と近似し、０．５乃至
５．０ｇ／１０ｍｉｎの範囲内のものが好ましい。尚、
該直鎖状極低密度ポリエチレン樹脂（Ｂ）には、従来の
チグラーナッタ触媒を用いて重合された樹脂は勿論、シ
ングルサイト系触媒を用いて重合された樹脂も含まれ
る。Next, the linear very low density polyethylene resin (B) used for the polyethylene multilayer heat shrinkable film of the present invention is the same as the above linear low density polyethylene resin (A).
Α-olefin is an ethylene-α-olefin copolymer having 4 to 8 carbon atoms. And
The density (D B ) of the resin (B) is from 0.880 to 0.9
It is necessary to be within the range of 15 g / cm 3 . The melt index of the linear very low-density polyethylene resin (B) is determined in consideration of the compatibility with the linear low-density polyethylene resin (A) and the stretching processability for imparting heat shrinkability. It is preferable that the resin has a melt index value close to that of the linear low density polyethylene resin (A) and is in the range of 0.5 to 5.0 g / 10 min. still,
The linear very low-density polyethylene resin (B) includes not only a resin polymerized using a conventional Ziegler-Natta catalyst, but also a resin polymerized using a single-site catalyst.
【０００９】そして、該直鎖状極低密度ポリエチレン樹
脂（Ｂ）の密度（ＤＢ）は、直鎖状低密度ポリエチレン
樹脂（Ａ）の密度（ＤＡ）よりも、０．０１０以上小さ
くする必要がある。即ち．芯層（Ｍ１）の直鎖状極低密
度ポリエチレン樹脂（Ｂ）の密度（ＤＢＭ １）と直鎖状
低密度ポリエチレン樹脂（Ａ）の密度（ＤＡＭ１）は、
次式を満足させることが必要である。ＤＡＭ１−Ｄ
ＢＭ１≧０．０１０芯層（Ｍ１）の直鎖状極低密度ポリ
エチレン樹脂（Ｂ）の密度（ＤＢＭ１）を、芯層（Ｍ
１）の直鎖状低密度ポリエチレン樹脂（Ａ）の密度（Ｄ
ＡＭ１）よりも０．０１０以上小さくさせないと、延伸
加工性を改良させることができない。The density (D B ) of the linear very low-density polyethylene resin ( B ) is smaller than the density (D A ) of the linear low-density polyethylene resin (A) by at least 0.010. There is a need. That is. The density (D BM 1 ) of the linear very low density polyethylene resin (B) and the density (D AM1 ) of the linear low density polyethylene resin (A) of the core layer (M1) are as follows:
It is necessary to satisfy the following equation. D AM1 -D
BM1 ≧ 0.010 The density (D BM1 ) of the linear very low density polyethylene resin (B) of the core layer (M1) was
Density (D) of linear low density polyethylene resin (A) of 1)
Unless it is smaller than AM1 ) by 0.010 or more, the stretchability cannot be improved.
【００１０】更に、本発明のポリエチレン系多層熱収縮
性フィルムに用いられる直鎖状高密度ポリエチレン樹脂
（Ｃ）は、前記直鎖状低密度ポリエチレン樹脂（Ａ）と
混合させる樹脂であり、αオレフィンが炭素数４乃至８
のエチレン−αオレフィン共重合体である。そして、該
樹脂（Ｃ）の密度（ＤＣ）は、０．９２５乃至０．９４
５ｇ／ｃｍ３の範囲内であることが必要である。そし
て、該直鎖状高密度ポリエチレン樹脂（Ｃ）のメルトイ
ンデックスは、直鎖状低密度ポリエチレン樹脂（Ａ）と
の相溶性や延伸加工性等を考慮して、直鎖状低密度ポリ
エチレン樹脂（Ａ）のメルトインデックス値と近似し、
０．５乃至５．０ｇ／１０ｍｉｎの範囲内のものが好ま
しい。尚、該直鎖状高密度ポリエチレン樹脂（Ｃ）に
は、従来のチグラーナッタ触媒を用いて重合された樹脂
は勿論、シングルサイト系触媒を用いて重合された樹脂
も含まれる。The linear high-density polyethylene resin (C) used in the polyethylene-based multilayer heat-shrinkable film of the present invention is a resin mixed with the linear low-density polyethylene resin (A). Has 4 to 8 carbon atoms
Is an ethylene-α-olefin copolymer. The density (D C ) of the resin ( C ) is 0.925 to 0.94.
It is necessary to be within the range of 5 g / cm 3 . The melt index of the linear high-density polyethylene resin (C) is determined in consideration of the compatibility with the linear low-density polyethylene resin (A) and the stretching processability. Approximate the melt index value of A),
Those having a range of 0.5 to 5.0 g / 10 min are preferable. In addition, the linear high-density polyethylene resin (C) includes not only a resin polymerized using a conventional Ziegler-Natta catalyst, but also a resin polymerized using a single-site catalyst.
【００１１】そして、該直鎖状高密度ポリエチレン樹脂
（Ｃ）の密度（ＤＣ）は、直鎖状低密度ポリエチレン樹
脂（Ａ）の密度（ＤＡ）よりも、０．０１０以上大きく
する必要がある。即ち、表面層（Ｆ１，Ｆ２）の直鎖状
高密度ポリエチレン樹脂（Ｃ）の密度（ＤＣＦ１，Ｄ
ＣＦ２）と直鎖状低密度ポリエチレン樹脂（Ａ）の密度
（ＤＡＦ１，ＤＡＦ２）は、次式を満足させることが必
要である。 Ｆ１層において、ＤＣＦ１−ＤＡＦ１≧０．０１０ Ｆ２層において、ＤＣＦ２−ＤＡＦ２≧０．０１０ 各表面層（Ｆ１、Ｆ２）の直鎖状高密度ポリエチレン樹
脂（Ｃ）の密度（ＤＣ Ｆ１、ＤＣＦ２）を直鎖状低密度
ポリエチレン樹脂（Ａ）の密度（ＤＡＦ１、Ｄ ＡＦ２）
よりも０．０１０以上大きくさせないと、延伸加工性を
改良させることができないばかりか、耐熱性を改良させ
ることができない。The linear high-density polyethylene resin
(C) density (DC) Is a linear low density polyethylene tree
Fat (A) density (DA0.010 or more larger than
There is a need to. That is, the linear structure of the surface layer (F1, F2)
Density of high density polyethylene resin (C) (DCF1, D
CF2) And density of linear low density polyethylene resin (A)
(DAF1, DAF2) Must satisfy the following equation:
It is important. In the F1 layer, DCF1-DAF1≧ 0.010 In the F2 layer, DCF2-DAF2≧ 0.010 Linear high-density polyethylene tree of each surface layer (F1, F2)
Fat (C) density (DC F1, DCF2) Linear low density
Density of polyethylene resin (A) (DAF1, D AF2)
If it is not made 0.010 or more larger than
Not only can't be improved,
Can not be.
【００１２】更に、各表面層の樹脂組成、及び、厚み構
成は、各表面層（Ｆ１，Ｆ２）の直鎖状高密度ポリエチ
レン樹脂（Ｃ）と直鎖状低密度ポリエチレン樹脂（Ａ）
の密度差（ＤＣＦ１−ＤＡＦ１、ＤＣＦ２−ＤＡＦ２）
にそれぞれ各表面層（Ｆ１、Ｆ２）の厚み割合
（ＬＦ１，ＬＦ２）と直鎖状高密度ポリエチレン樹脂
（Ｃ）の重量割合（ＷＣＦ１，ＷＣＦ２）を掛けた値の
和が０．０１以上で、しかも、０．２０以下になるよう
にする必要がある。好ましくは、０．０１以上で、しか
も、０．１０以下になるようにする。即ち、次式を満足
させることが必要である。 ０．０１≦｛（ＤＣＦ１−ＤＡＦ１）×ＬＦ１×Ｗ
ＣＦ１｝＋｛（ＤＣＦ２−ＤＡＦ２）×ＬＦ２×Ｗ
ＣＦ２｝≦０．２０ 尚、各表面層（Ｆ１、Ｆ２）での直鎖状高密度ポリエチ
レン樹脂（Ｃ）の重量割合（ＷＣＦ１、ＷＣＦ２）は、
各表面層の直鎖状低密度ポリエチレン樹脂（Ａ）と直鎖
状高密度ポリエチレン樹脂（Ｃ）との合計重量に対する
重量割合（ｗｔ％）を示す。Further, the resin composition and the thickness constitution of each surface layer are determined by the linear high-density polyethylene resin (C) and the linear low-density polyethylene resin (A) of each surface layer (F1, F2).
Density difference (D CF1 -D AF1 , D CF2 -D AF2 )
Is multiplied by the thickness ratio (L F1 , L F2 ) of each surface layer (F1, F2) and the weight ratio (W CF1 , W CF2 ) of the linear high-density polyethylene resin (C). It is necessary to make it equal to or more than 01 and equal to or less than 0.20. Preferably, it is not less than 0.01 and not more than 0.10. That is, it is necessary to satisfy the following expression. 0.01 ≦ ｛(D CF1 −D AF1 ) × L F1 × W
CF1 ｝ + ｛(D CF2 -D AF2 ) × L F2 × W
CF2 ｝ ≦ 0.20 The weight ratio (W CF1 , W CF2 ) of the linear high-density polyethylene resin (C) in each surface layer (F1, F2) is:
The weight ratio (wt%) to the total weight of the linear low-density polyethylene resin (A) and the linear high-density polyethylene resin (C) in each surface layer is shown.
【００１３】各表面層の樹脂組成、及び、厚み構成にお
いて、各表面層の直鎖状高密度ポリエチレン樹脂（Ｃ）
と直鎖状低密度ポリエチレン樹脂（Ａ）の密度差に、そ
れぞれ各表面層の厚み割合と直鎖状高密度ポリエチレン
樹脂（Ｃ）の重量割合を掛けた値の和が０．０１未満で
あると、耐熱性に優れたポリエチレン系多層熱収縮性フ
ィルムが得られない。又、高温側の延伸適性温度範囲が
広くならず、安定して延伸加工することができない。In the resin composition of each surface layer and the thickness configuration, the linear high-density polyethylene resin (C) of each surface layer
The sum of values obtained by multiplying the density difference between the linear low-density polyethylene resin (A) and the linear low-density polyethylene resin (A) by the weight ratio of each surface layer and the linear high-density polyethylene resin (C) is less than 0.01. , A polyethylene-based multilayer heat-shrinkable film having excellent heat resistance cannot be obtained. In addition, the stretching temperature range on the high temperature side is not widened, and stable stretching cannot be performed.
【００１４】又、各表面層の樹脂組成、及び、厚み構成
において、各表面層の直鎖状高密度ポリエチレン樹脂
（Ｃ）と直鎖状低密度ポリエチレン樹脂（Ａ）の密度差
に、それぞれ各表面層の厚み割合と直鎖状高密度ポリエ
チレン樹脂（Ｃ）の重量割合を掛けた値の和が０．２０
を越えると、収縮応力が強くなり、収縮応力の弱いポリ
エチレン系多層熱収縮性フィルムが得られない。又、延
伸加工時に延伸斑が生じ易くなる。Further, in the resin composition and the thickness structure of each surface layer, the density difference between the linear high-density polyethylene resin (C) and the linear low-density polyethylene resin (A) of each surface layer respectively The sum of the value obtained by multiplying the thickness ratio of the surface layer by the weight ratio of the linear high-density polyethylene resin (C) is 0.20.
If it exceeds, the shrinkage stress becomes strong, and a polyethylene-based multilayer heat-shrinkable film having a weak shrinkage stress cannot be obtained. In addition, stretching unevenness tends to occur during stretching.
【００１５】しかも、芯層の樹脂組成、及び、厚み構成
は、芯層（Ｍ１）の直鎖状低密度ポリエチレン樹脂
（Ａ）と直鎖状極低密度ポリエチレン樹脂（Ｂ）の密度
差（ＤＡ Ｍ１−ＤＢＭ１）に芯層（Ｍ１）の厚み割合
（ＬＭ１）と直鎖状極低密度ポリエチレン樹脂（Ｂ）の
重量割合（ＷＢＭ１）を掛けた値が、０．４を越え、し
かも、１．６以下になるようにする必要がある。即ち次
式を満足させることが必要である。 ０．４０＜（ＤＡＭ１−ＤＢＭ１）×ＬＭ１×ＷＢＭ１
≦１．６ 尚、芯層（Ｍ１）での直鎖状極低密度ポリエチレン樹脂
（Ｂ）の重量割合（Ｗ ＢＭ１）は、芯層の直鎖状低密度
ポリエチレン樹脂（Ａ）と直鎖状極低密度ポリエチレン
樹脂（Ｂ）との合計量に対する割合を示す。Moreover, the resin composition of the core layer and the thickness structure
Is the linear low density polyethylene resin of the core layer (M1)
(A) and density of linear very low density polyethylene resin (B)
Difference (DA M1-DBM1) Is the thickness ratio of the core layer (M1)
(LM1) And linear very low density polyethylene resin (B)
Weight ratio (WBM1) Multiplied by more than 0.4
It is necessary to make it less than 1.6. Ie next
It is necessary to satisfy the formula. 0.40 <(DAM1-DBM1) × LM1× WBM1
≦ 1.6 In addition, linear very low density polyethylene resin in the core layer (M1)
(B) weight ratio (W BM1) Indicates the linear low density of the core layer
Polyethylene resin (A) and linear very low density polyethylene
The ratio to the total amount with the resin (B) is shown.
【００１６】芯層の樹脂組成、及び、厚み構成におい
て、芯層の直鎖状低密度ポリエチレン樹脂（Ａ）と直鎖
状極低密度ポリエチレン樹脂（Ｂ）の密度差に、芯層の
厚み割合と直鎖状極低密度ポリエチレン樹脂（Ｂ）の重
量割合を掛けた値が０．４以下であると、収縮応力が強
くなり、収縮応力の弱いポリエチレン系多層熱収縮性フ
ィルムが得られない。In the resin composition and thickness structure of the core layer, the difference in density between the linear low-density polyethylene resin (A) and the linear very low-density polyethylene resin (B) of the core layer is determined by the thickness ratio of the core layer. If the value obtained by multiplying the ratio by weight of the linear ultra-low density polyethylene resin (B) to the linear low-density polyethylene resin is 0.4 or less, the shrinkage stress becomes strong, and a polyethylene-based multilayer heat-shrinkable film having a low shrinkage stress cannot be obtained.
【００１７】又、芯層の樹脂組成、及び、厚み構成にお
いて、芯層の直鎖状低密度ポリエチレン樹脂（Ａ）と直
鎖状極低密度ポリエチレン樹脂（Ｂ）の密度差に、芯層
の厚み割合と直鎖状極低密度ポリエチレン樹脂（Ｂ）の
重量割合を掛けた値が１．６を越えると、ポリエチレン
系多層熱収縮性フィルムの耐熱性が劣ってしまう。The difference in density between the linear low-density polyethylene resin (A) and the linear very low-density polyethylene resin (B) of the core layer in the resin composition and the thickness of the core layer is different from that of the core layer. If the value obtained by multiplying the thickness ratio by the weight ratio of the linear very low density polyethylene resin (B) exceeds 1.6, the heat resistance of the polyethylene-based multilayer heat-shrinkable film will be poor.
【００１８】本発明のポリエチレン系多層熱収縮性フィ
ルムは、各層に使用される直鎖状低密度ポリエチレン樹
脂（Ａ）の種類が同一であっても、相違していてもかま
わない。又、両表面層に用いられる直鎖状高密度ポリエ
チレン樹脂（Ｃ）も、同一であっても、相違していても
かまわない。更に、各表面層、及び、芯層に用いる直鎖
状低密度ポリエチレン樹脂（Ａ）は、本発明の主旨に基
づいて、例えば、各密度と混合割合を考慮して、２種以
上使用することも可能である。In the polyethylene-based multilayer heat-shrinkable film of the present invention, the kind of the linear low-density polyethylene resin (A) used for each layer may be the same or different. Further, the linear high-density polyethylene resin (C) used for both surface layers may be the same or different. Furthermore, two or more linear low-density polyethylene resins (A) used for each surface layer and core layer may be used based on the gist of the present invention, for example, in consideration of each density and mixing ratio. Is also possible.
【００１９】又、本発明のポリエチレン系多層熱収縮性
フィルムは、用途によって酸化防止剤、静電防止剤、滑
剤、アンチブロッキング剤、着色剤、充填剤等を適宜添
加することは可能である。又、延伸加工前、或は、延伸
加工後に架橋反応を起こさせるために、架橋剤や架橋助
剤等を加えることも可能である。更に、本発明の主旨を
逸脱させない範囲で、他の樹脂を混合させることも可能
である。例えば、高圧法低密度ポリエチレン樹脂を２０
重量％以下混合させることも可能である。The polyethylene-based multilayer heat-shrinkable film of the present invention may optionally contain an antioxidant, an antistatic agent, a lubricant, an antiblocking agent, a coloring agent, a filler, and the like, depending on the application. It is also possible to add a cross-linking agent, a cross-linking aid, or the like in order to cause a cross-linking reaction before or after the drawing process. Further, other resins can be mixed without departing from the gist of the present invention. For example, high-pressure low-density polyethylene
It is also possible to mix by weight% or less.
【００２０】更に、本発明のポリエチレン系多層熱収縮
性フィルムは、両表面層と芯層とからなる３層構成に関
するものであるが、本発明の主旨を逸脱させない範囲
で、他の層を設けることもできる。例えば、本発明のポ
リエチレン系多層熱収縮性フィルムを製膜する際に生じ
る不適格品等の再生原料からなる中間層を設けることも
可能である。Further, the polyethylene-based multilayer heat-shrinkable film of the present invention relates to a three-layer structure comprising both surface layers and a core layer, but other layers are provided without departing from the gist of the present invention. You can also. For example, it is also possible to provide an intermediate layer made of a recycled material such as an unqualified product generated when the polyethylene-based multilayer heat-shrinkable film of the present invention is formed.
【００２１】本発明のポリエチレン系多層熱収縮性フィ
ルムの製膜方法としては、特に限定されるものではない
が、押出成形されたシートを、テンター方式やインフレ
ーション方式による二軸延伸加工が好ましい。特に、イ
ンフレーション方式によって二軸延伸加工されるのが好
ましい。尚、本発明のポリエチレン系多層熱収縮性フィ
ルムは、二軸延伸加工された二軸収縮フィルムばかりで
なく、一軸延伸加工された一軸収縮フィルムをも意味す
る。The method for producing the polyethylene-based multilayer heat shrinkable film of the present invention is not particularly limited, but biaxial stretching of an extruded sheet by a tenter method or an inflation method is preferred. In particular, biaxial stretching is preferably performed by an inflation method. The polyethylene-based multilayer heat shrinkable film of the present invention means not only a biaxially stretched biaxially shrinkable film but also a uniaxially stretched uniaxially shrinkable film.
【００２２】本発明のポリエチレン系多層熱収縮性フィ
ルムの用途としては、熱収縮包装時の収縮応力により湾
曲したり変形したする商品、例えば、ノートやカード等
の熱収縮包装に好適である。The polyethylene-based multilayer heat-shrinkable film of the present invention is suitable for heat-shrinkable packaging of goods, for example, notebooks and cards, which are bent or deformed by shrinkage stress during the heat-shrinking packaging.
【００２３】[0023]
【作用】表面層の直鎖状低密度樹脂（Ａ）に特定の密度
を有する直鎖状高密度ポリエチレン樹脂（Ｃ）を特定量
混合させて高温での延伸加工性を向上させると共に、芯
層の直鎖状低密度ポリエチレン樹脂（Ａ）に特定の密度
を有する直鎖状極低密度ポリエチレン樹脂（Ｂ）を特定
量混合させて低温での延伸加工性を向上させ、延伸加工
適性温度範囲を広くしている。そして、表面層に特定の
密度を有する直鎖状高密度ポリエチレン樹脂（Ｃ）が特
定量混合されているので耐熱性が向上し、熱収縮包装時
の熱収縮トンネル内でフィルムを溶融させたり白化させ
たりすることなく、十分熱収縮させることができ、緊縛
性に優れた熱収縮包装体を得ることができる。又、芯層
に特定の密度を有する直鎖状極低密度ポリエチレン樹脂
（Ｂ）が特定量混合されているので熱収縮応力が弱くな
り、熱収縮包装時に収縮応力が加わらず、被包装体が変
形しない熱収縮包装体を得ることができる。The linear low-density resin (A) of the surface layer is mixed with a specific amount of a linear high-density polyethylene resin (C) having a specific density to improve the stretchability at high temperatures and to improve the core layer. A specific amount of a linear low-density polyethylene resin (B) having a specific density is mixed with a specific amount of the linear low-density polyethylene resin (A) to improve the stretchability at low temperatures, and the suitable temperature range for stretchability is adjusted. Wide. Since the surface layer is mixed with a specific amount of a linear high-density polyethylene resin (C) having a specific density, heat resistance is improved, and the film is melted or whitened in a heat shrink tunnel during heat shrink wrapping. Heat shrinkage can be performed sufficiently without causing heat shrinkage, and a heat shrinkable package excellent in tightness can be obtained. Further, since the core layer is mixed with the specific amount of the linear very low density polyethylene resin (B) having the specific density, the heat shrinkage stress is weakened, and the shrinkage stress is not applied at the time of heat shrink wrapping, and the packaged body is A heat-shrinkable package that does not deform can be obtained.
【００２４】以下、実施例、及び、比較例を示し、本発
明の内容をより具体的に説明する。尚、評価方法につい
ては、次のような方法によって行った。 （延伸加工性）チューブ状の多層未延伸原反をインフレ
ーション方式により二軸延伸させる際、延伸温度を変化
させて延伸加工を試みた。そして、延伸温度を変化され
ても延伸加工が可能で、しかも、広い温度範囲において
長時間安定して延伸加工が行えるものを（Ａ）、延伸温
度を変化させても延伸加工は可能であるが、狭い最適温
度範囲でないと長時間安定して延伸加工が行えないもの
を（Ｂ）、狭い最適温度範囲でも長時間安定して延伸加
工が行えないものを（Ｃ）と評価した。Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, about the evaluation method, it performed by the following methods. (Stretchability) When biaxially stretching a tubular multilayer unstretched raw material by an inflation method, stretching was attempted by changing the stretching temperature. (A) Stretching is possible even if the stretching temperature is changed, although stretching can be performed even when the stretching temperature is changed, and the stretching can be performed stably for a long time in a wide temperature range. A sample in which stretching could not be performed stably for a long time without a narrow optimum temperature range was evaluated as (B), and a sample in which stretching could not be performed stably for a long time even in a narrow optimum temperature range was evaluated as (C).
【００２５】（耐熱性）熱収縮トンネル内で熱収縮させ
る際、良好なる熱収縮包装体が得られる条件（温度と時
間）で、包装体に溶融白化を生じさせないものを
（Ａ）、包装体は溶融白化するが、穴は開かないものを
（Ｂ）、包装体に溶融白化が生じ、しかも、穴があくも
のを（Ｃ）と評価した。 （低収縮応力性）ノート３冊を熱収縮包装させた際、湾
曲を生じさせることなく、しかも、皺の無い包装体が得
られるものを（Ａ）、包装体に皺を生じさせないように
熱収縮させると、若干湾曲を生じるものを（Ｂ）、包装
体に皺を生じさせないように熱収縮させると、大きく湾
曲してしまうものを（Ｃ）と評価した。(Heat resistance) When heat shrinking is performed in a heat shrink tunnel, under conditions (temperature and time) under which a good heat shrinkable package can be obtained, a package that does not cause melt whitening in the package (A) The sample was evaluated as (B) when melt-whitened but did not form a hole, and as (C) when the package was melt-whitened and had a hole. (Low shrinkage stress) When three notebooks are heat-shrink-wrapped, a package that does not bend and has no wrinkles (A) is heat-treated so as not to cause wrinkles in the package. Those that caused a slight curvature when shrunk were evaluated as (B), and those that were greatly curved when heat shrunk so as not to cause wrinkles in the package were evaluated as (C).
【００２６】〔実施例１乃至４、及び、比較例１乃至
４〕表面層に密度が０．９２０ｇ／ｃｍ３の直鎖状低密
度ポリエチレン樹脂（Ａ）と密度が０．９３０ｇ／ｃｍ
３、又は、０．９３５ｇ／ｃｍ３の直鎖状高密度ポリエ
チレン樹脂（Ｃ）を混合させた各種樹脂組成物を、芯層
に密度が０．９２０ｇ／ｃｍ３の直鎖状低密度ポリエチ
レン樹脂（Ａ）と密度が０．８９０ｇ／ｃｍ ３、又は、
０．９００ｇ／ｃｍ３直鎖状極低密度ポリエチレン樹脂
（Ｂ）を混合させた各種樹脂組成物を用い、厚み構成が
１０／８０／１０、又は２０／６０／２０の各種チュー
ブ状多層未延伸原反を共押出した。表１に、各層の樹脂
組成と厚み構成を示す。[Examples 1 to 4 and Comparative Examples 1 to
4] The surface layer has a density of 0.920 g / cm.3Linear low density
Polyethylene resin (A) and density 0.930g / cm
3Or 0.935 g / cm3Linear high density polye
Various kinds of resin compositions mixed with a Tylene resin (C) are mixed with a core layer.
Has a density of 0.920 g / cm3Linear low density polyethylene
The density is 0.890 g / cm with the ren resin (A) 3Or
0.900 g / cm3Linear very low density polyethylene resin
Using various resin compositions mixed with (B), the thickness configuration is
Various chews of 10/80/10 or 20/60/20
The multilayer unstretched raw material was co-extruded. Table 1 shows the resin of each layer.
The composition and thickness configuration are shown.
【００２７】[0027]
【表１】 [Table 1]
【００２８】共押出された各種チューブ状多層未延伸原
反を急冷した後、インフレーション方式により縦方向、
横方向共に５．０倍の二軸延伸加工を行った。その際
の、延伸加工性を表２に示す。又、得られたポリエチレ
ン系多層熱収縮性フィルムの耐熱性と低収縮応力性を表
２に示す。After quenching the co-extruded various tubular multi-layered unstretched raw materials, in the longitudinal direction by inflation method,
The biaxial stretching process was performed 5.0 times in both the horizontal and vertical directions. Table 2 shows the stretchability at that time. Table 2 shows the heat resistance and low shrinkage stress of the resulting polyethylene-based multilayer heat shrinkable film.
【００２９】[0029]
【表２】 [Table 2]
【００３０】表２より明らかな如く、本発明の条件を備
えた実施例１乃至４のポリエチレン系多層熱収縮性フィ
ルムは、延伸加工性が良好であることは勿論、耐熱性と
低収縮応力性に優れており、ノートの熱収縮包装に適し
ていた。これに対し、本発明の条件を備えていない比較
例１乃至４のポリエチレン系多層熱収縮性フィルムは、
延伸加工、耐熱性、そして、低収縮応力性を同時に備え
ていなかった。As is evident from Table 2, the polyethylene-based multilayer heat-shrinkable films of Examples 1 to 4 satisfying the conditions of the present invention have not only good stretchability but also heat resistance and low shrinkage stress. Excellent for heat shrink wrapping of notebooks. On the other hand, the polyethylene-based multilayer heat-shrinkable films of Comparative Examples 1 to 4, which do not have the conditions of the present invention,
It did not have stretch processing, heat resistance, and low shrinkage stress at the same time.
【００３１】[0031]
【効果】本発明のポリエチレン系多層熱収縮性フィルム
は、延伸加工性が良好で、長時間安定して連続運転する
ことができるので生産性に優れ、不適格品の発生が少な
く経済的である。しかも、延伸適性温度範囲が広いので
延伸条件の設定が容易で、熟練した作業者でなくても容
易に延伸加工することができる。又、本発明のポリエチ
レン系多層熱収縮性フィルムは、耐熱性と低収縮応力性
に優れているので、熱収縮包装時に商品を変形さること
なく、しかも、未収縮部を残すことなく緊迫性に優れた
熱収縮包装体を得ることができる。特に、ノートやカー
ド等の熱収縮包装に使用した際に、本発明の優れた効果
を発揮し、良好な熱収縮包装体を得ることができる。[Effect] The polyethylene-based multilayer heat shrinkable film of the present invention has good stretchability, and can be stably operated continuously for a long period of time, so that it is excellent in productivity and economical with less generation of unqualified products. . In addition, the stretching temperature range is wide, so that the stretching conditions can be easily set, and the stretching can be easily performed without a skilled worker. In addition, since the polyethylene-based multilayer heat-shrinkable film of the present invention has excellent heat resistance and low shrinkage stress, it does not deform the product at the time of heat-shrink wrapping, and has a tightness without leaving an unshrinked portion. An excellent heat-shrinkable package can be obtained. In particular, when used for heat shrink wrapping of notebooks, cards, and the like, the excellent effects of the present invention are exhibited, and good heat shrink wraps can be obtained.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F100 AK05C AK06A AK06B AK63A AK63B AK63C BA03 BA10A BA10C BA25 BA26 GB15 JA03 JA13A JA13B JA13C YY00 YY00A YY00B YY00C ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F100 AK05C AK06A AK06B AK63A AK63B AK63C BA03 BA10A BA10C BA25 BA26 GB15 JA03 JA13A JA13B JA13C YY00 YY00A YY00B YY00C
Claims (1)
０．９１０乃至０．９３０ｇ／ｃｍ３の直鎖状低密度ポ
リエチレン樹脂（Ａ）と、密度（ＤＣ）０．９２５乃至
０．９４５ｇ／ｃｍ３の直鎖状高密度ポリエチレン樹脂
（Ｃ）からなり、芯層（Ｍ１）が密度（ＤＡ）０．９１
０乃至０．９３０ｇ／ｃｍ３の直鎖状低密度ポリエチレ
ン樹脂（Ａ）と密度（ＤＢ）０．８８乃至０．９１５ｇ
／ｃｍ ３の直鎖状極低密度ポリエチレン樹脂（Ｂ）から
なり、しかも、下記条件を満足することを特徴とするポ
リエチレン系多層熱収縮性フィルム。 （ａ）ＤＡＭ１−ＤＢＭ１≧０．０１０、しかも、 ＤＣＦ１−ＤＡＦ１≧０．０１０、しかも、 ＤＣＦ２−ＤＡＦ２≧０．０１０、しかも、 （ｂ）０．０１≦｛（ＤＣＦ１−ＤＡＦ１）×ＬＦ１×
ＷＣＦ１｝＋｛（ＤＣ Ｆ２−ＤＡＦ２）×ＬＦ２×Ｗ
ＣＦ２｝≦０．２０、しかも ０．４０＜（ＤＡＭ１−ＤＢＭ１）×ＬＭ１×ＷＢＭ１
≦１．６ 但し、 ＤＡ：直鎖状低密度ポリエチレン樹脂（Ａ）の密度（ｇ
／ｃｍ３） ＤＢ：直鎖状極低密度ポリエチレン樹脂（Ｂ）の密度
（ｇ／ｃｍ３） ＤＣ：直鎖状高密度ポリエチレン樹脂（Ｃ）の密度（ｇ
／ｃｍ３） ＤＡＭ１：Ｍ１層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＢＭ１：Ｍ１層の直鎖状極低密度ポリエチレン樹脂
（Ｂ）の密度（ｇ／ｃｍ ３） ＤＡＦ１：Ｆ１層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＡＦ２：Ｆ２層の直鎖状低密度ポリエチレン樹脂
（Ａ）の密度（ｇ／ｃｍ３） ＤＣＦ１：Ｆ１層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の密度（ｇ／ｃｍ３） ＤＣＦ２：Ｆ２層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の密度（ｇ／ｃｍ３） ＬＭ１：Ｍ１層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＬＦ１：Ｆ１層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＬＦ２：Ｆ２層の全層厚みに対する厚み割合（全層厚み
「１」に対する割合） ＷＢＭ１：Ｍ１層の直鎖状極低密度ポリエチレン樹脂
（Ｂ）の重量割合（ｗｔ％） ＷＣＦ１：Ｆ１層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の重量割合（ｗｔ％） ＷＣＦ２：Ｆ２層の直鎖状高密度ポリエチレン樹脂
（Ｃ）の重量割合（ｗｔ％）The surface layer (F1, F2) has a density (DA)
0.910 to 0.930 g / cm3Linear low-density
Ethylene resin (A) and density (DC) 0.925 or more
0.945g / cm3Linear high density polyethylene resin
(C), and the core layer (M1) has a density (DA) 0.91
0 to 0.930 g / cm3Linear low-density polyethylene
Resin (A) and density (DB) 0.88 to 0.915g
/ Cm 3From the linear very low density polyethylene resin (B)
And satisfy the following conditions:
Polyethylene multilayer heat shrinkable film. (A) DAM1-DBM1≧ 0.010, and DCF1-DAF1≧ 0.010, and DCF2-DAF2≧ 0.010, and (b) 0.01 ≦ ｛(DCF1-DAF1) × LF1×
WCF1｝ + ｛(DC F2-DAF2) × LF2× W
CF2｝ ≦ 0.20, and 0.40 <(DAM1-DBM1) × LM1× WBM1
≦ 1.6 where DA: Density of linear low density polyethylene resin (A) (g)
/ Cm3) DB: Density of linear very low density polyethylene resin (B)
(G / cm3) DC: Density of linear high density polyethylene resin (C) (g
/ Cm3) DAM1: Linear low density polyethylene resin of M1 layer
Density of (A) (g / cm3) DBM1: Linear very low density polyethylene resin of M1 layer
Density of (B) (g / cm 3) DAF1: Linear low density polyethylene resin of F1 layer
Density of (A) (g / cm3) DAF2: Linear low density polyethylene resin of F2 layer
Density of (A) (g / cm3) DCF1: Linear high density polyethylene resin of F1 layer
Density of (C) (g / cm3) DCF2: F2 layer linear high-density polyethylene resin
Density of (C) (g / cm3) LM1: Thickness ratio of M1 layer to total layer thickness (total layer thickness
(Ratio to “1”) LF1: Thickness ratio of F1 layer to total layer thickness (total layer thickness)
(Ratio to “1”) LF2: Thickness ratio of F2 layer to total layer thickness (total layer thickness)
Ratio to "1") WBM1: Linear very low density polyethylene resin of M1 layer
Weight ratio (wt%) of (B) WCF1: Linear high density polyethylene resin of F1 layer
(C) weight ratio (wt%) WCF2: F2 layer linear high-density polyethylene resin
Weight ratio of (C) (wt%)
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|---|---|---|---|
| JP2001184464A JP4838948B2 (en) | 2001-06-19 | 2001-06-19 | Polyethylene multilayer heat shrinkable film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001184464A JP4838948B2 (en) | 2001-06-19 | 2001-06-19 | Polyethylene multilayer heat shrinkable film |
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|---|---|
| JP2002370327A true JP2002370327A (en) | 2002-12-24 |
| JP4838948B2 JP4838948B2 (en) | 2011-12-14 |
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| JP2001184464A Expired - Lifetime JP4838948B2 (en) | 2001-06-19 | 2001-06-19 | Polyethylene multilayer heat shrinkable film |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006027052A (en) * | 2004-07-15 | 2006-02-02 | Gunze Ltd | Heat-shrinkable laminated film and packaging lightweight pet bottle |
| WO2012070373A1 (en) * | 2010-11-22 | 2012-05-31 | 三井化学東セロ株式会社 | Biaxially oriented ethylene-polymer multi-layer film |
| KR101488784B1 (en) | 2015-01-06 | 2015-02-11 | 호명화학공업 주식회사 | Heat shrinkable film for mothproof |
| WO2016051566A1 (en) * | 2014-10-02 | 2016-04-07 | 興人フィルム＆ケミカルズ株式会社 | Polyethylene-type thermally shrinkable multi-layer film for packaging use, packaged product, and method for packaging said packaged product |
| WO2021144136A1 (en) * | 2020-01-13 | 2021-07-22 | Sabic Global Technologies B.V. | Bi-directionally oriented polyethylene film |
| JP7188522B1 (en) | 2021-09-14 | 2022-12-13 | 住友ベークライト株式会社 | Laminated film and package |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101317856B1 (en) | 2013-01-29 | 2013-10-14 | 호명화학공업 주식회사 | Triplelayer polyethylene heat shrinkable film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006027052A (en) * | 2004-07-15 | 2006-02-02 | Gunze Ltd | Heat-shrinkable laminated film and packaging lightweight pet bottle |
| JP4651982B2 (en) * | 2004-07-15 | 2011-03-16 | グンゼ株式会社 | Heat-shrinkable laminated film and packaging lightweight PET bottle |
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| WO2016051566A1 (en) * | 2014-10-02 | 2016-04-07 | 興人フィルム＆ケミカルズ株式会社 | Polyethylene-type thermally shrinkable multi-layer film for packaging use, packaged product, and method for packaging said packaged product |
| KR101488784B1 (en) | 2015-01-06 | 2015-02-11 | 호명화학공업 주식회사 | Heat shrinkable film for mothproof |
| WO2021144136A1 (en) * | 2020-01-13 | 2021-07-22 | Sabic Global Technologies B.V. | Bi-directionally oriented polyethylene film |
| JP7188522B1 (en) | 2021-09-14 | 2022-12-13 | 住友ベークライト株式会社 | Laminated film and package |
| JP2023042364A (en) * | 2021-09-14 | 2023-03-27 | 住友ベークライト株式会社 | Laminate film and package |
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| JP4838948B2 (en) | 2011-12-14 |
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