JP3093020B2 - Heat shrinkable laminated film - Google Patents
Heat shrinkable laminated filmInfo
- Publication number
- JP3093020B2 JP3093020B2 JP04027812A JP2781292A JP3093020B2 JP 3093020 B2 JP3093020 B2 JP 3093020B2 JP 04027812 A JP04027812 A JP 04027812A JP 2781292 A JP2781292 A JP 2781292A JP 3093020 B2 JP3093020 B2 JP 3093020B2
- Authority
- JP
- Japan
- Prior art keywords
- density polyethylene
- layer
- laminated film
- low
- linear low
- 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.)
- Expired - Lifetime
Links
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱収縮性積層フィルム
に関し、より詳しくは、低温収縮性と結束力に優れ、か
つ耐熱性があり、しかも強靭で透明性に優れる熱収縮性
包装用フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable laminated film, and more particularly, to a heat-shrinkable packaging film which is excellent in low-temperature shrinkage, binding power, heat resistance, toughness and transparency. About.
【０００２】[0002]
【従来の技術】従来より、収縮包装用フィルムの性能と
しては、低温収縮性と結束力に優れ、かつ耐熱性があ
り、強靭で透明性に優れることが望まれていた。ここで
低温収縮性に優れるとは、８０℃の温度の雰囲気中にお
ける５分後の、フィルムの縦方向の寸法収縮率が２０％
以上であることをいい、その方法手段としてはフィルム
を９０℃以下、好ましくは８５℃以下の温度で縦方向に
２倍以上に一軸延伸することにより達成される。2. Description of the Related Art Conventionally, shrink wrapping films have been demanded to have excellent low-temperature shrinkability and binding power, have heat resistance, toughness and excellent transparency. Here, "excellent in low-temperature shrinkability" means that the film has a longitudinal dimensional shrinkage of 20% after 5 minutes in an atmosphere at a temperature of 80 ° C.
This is achieved by uniaxially stretching the film twice or more in the machine direction at a temperature of 90 ° C. or lower, preferably 85 ° C. or lower.
【０００３】しかしながら、汎用の低密度ポリエチレ
ン、ＥＶＡ、直鎖状低密度ポリエチレンおよび高密度ポ
リエチレン等の単層の収縮包装用フィルムでは上記の諸
性能を満たすことはできなかった。However, single-layer shrink-wrapping films such as general-purpose low-density polyethylene, EVA, linear low-density polyethylene, and high-density polyethylene cannot satisfy the above-mentioned various properties.
【０００４】すなわち、低密度ポリエチレン単体では、
耐熱性が不足し、完全に収縮させ、タイトで美麗な包装
仕上りを得る前にフィルムが破れてしまうため、包装外
観に欠け、結束力も充分ではない（収縮温度範囲がきわ
めて狭い）。ＥＶＡ単体では２倍以上の延伸を安定して
得ることが困難であり、また耐熱性も不足する。直鎖状
低密度ポリエチレン単体では、結束力が弱く、耐熱性に
もやや欠ける（収縮温度範囲が狭い）。高密度ポリエチ
レン単体やポリプロピレン単体では、９０℃以下の温度
の延伸では異常ネッキングの発生、白化、延伸切れ等が
あり、フィルム自体を良好に得ることができない。[0004] That is, low-density polyethylene alone,
Lack of heat resistance, complete shrinkage, and tearing of the film before obtaining a tight and beautiful packaging finish results in lack of packaging appearance and insufficient binding power (shrinkage temperature range is extremely narrow). With EVA alone, it is difficult to stably obtain stretching of twice or more, and heat resistance is also insufficient. A straight-chain low-density polyethylene alone has weak binding power and slightly lacks heat resistance (shrinkage temperature range is narrow). In the case of high-density polyethylene alone or polypropylene alone, stretching at a temperature of 90 ° C. or less may cause abnormal necking, whitening, stretching breakage, and the like, making it impossible to obtain a good film itself.
【０００５】また、電子線照射して延伸した低密度ポリ
エチレンフィルム（本出願人のエストロンＳ）は、上記
諸性能面において優れているが、汎用の包装機に適用す
ることができず、すなわち、熱シールすることができ
ず、また高コストであるという問題点があった。A low-density polyethylene film (estrone S of the present applicant) stretched by irradiation with an electron beam is excellent in the above-mentioned various performances, but cannot be applied to a general-purpose packaging machine. Heat sealing cannot be performed, and the cost is high.
【０００６】[0006]
【発明が解決しようとする課題】本発明の目的は、上述
した従来技術の諸欠点を解決し、低温収縮性と結束力に
優れ、かつ耐熱性、強靭性、透明性に優れると同時に、
汎用の収縮包装機にも適用できて、コストの安価な熱収
縮性包装用フィルムを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to have excellent low-temperature shrinkage and binding power, and to have excellent heat resistance, toughness and transparency.
An object of the present invention is to provide a heat-shrinkable packaging film which can be applied to a general-purpose shrink-wrapping machine and is inexpensive.
【０００７】本発明者らは、鋭意研究した結果、フィル
ムを積層構成として、フィルム層を形成する樹脂の配合
と組合せ、各層の厚さ構成、複合延伸の工夫により、上
記目的を達成できることを見出だし、その知見に基づい
て本発明を完成するに至った。The inventors of the present invention have conducted intensive studies and found that the above object can be achieved by forming a film into a laminated structure, combining and combining the resin for forming the film layer, forming the thickness of each layer, and devising composite stretching. The present inventors have completed the present invention based on the findings.
【０００８】[0008]
【課題を解決するための手段】すなわち、本発明の第１
発明によれば、中心層が高密度ポリエチレンと低密度ポ
リエチレンのブレンド物、高密度ポリエチレンと直鎖状
低密度ポリエチレンのブレンド物、または高密度ポリエ
チレンと低密度ポリエチレンと直鎖状低密度ポリエチレ
ンの３元ブレンド物からなり、前記中心層をサンドイッ
チする２つの層が密度０．９３５ｇ／cm3 以下、融点１
２０〜１２８℃の直鎖状低密度ポリエチレンからなる３
層共押出積層シートを、９０℃以下の延伸温度にて、２
〜５倍の範囲で一軸延伸した積層フィルムであって、前
記中心層の厚さが積層フィルム総厚さの３５〜８０％で
あることを特徴とする熱収縮性積層フィルムが提供せら
れる（図１参照）。That is, the first aspect of the present invention is as follows.
According to the invention, the center layer is a blend of high-density polyethylene and low-density polyethylene, a blend of high-density polyethylene and linear low-density polyethylene, or a mixture of high-density polyethylene, low-density polyethylene and linear low-density polyethylene. The two layers sandwiching the central layer have a density of 0.935 g / cm 3 or less and a melting point of 1
3 consisting of linear low-density polyethylene at 20 to 128 ° C
The layer coextruded laminated sheet is stretched at a stretching temperature of 90 ° C.
A heat-shrinkable laminated film is provided, which is a laminated film uniaxially stretched in a range of up to 5 times, wherein the thickness of the central layer is 35 to 80% of the total thickness of the laminated film (FIG. 1).
【０００９】また、本発明の第２発明によれば、中心層
が高密度ポリエチレンと低密度ポリエチレンのブレンド
物、高密度ポリエチレンと直鎖状低密度ポリエチレンの
ブレンド物、または高密度ポリエチレンと低密度ポリエ
チレンと直鎖状低密度ポリエチレンの３元ブレンド物か
らなり、前記中心層をサンドイッチする２つの層が密度
０．９３５ｇ／cm3 以下、融点１２０〜１２８℃の直鎖
状低密度ポリエチレンからなる３層共押出積層チューブ
を、チューブ状のまま、９０℃以下の延伸温度にて、２
〜５倍の範囲で一軸延伸した積層フィルムであって、前
記中心層の厚さが積層フィルム総厚さの３５〜８０％で
あることを特徴とする熱収縮性積層フィルムが提供せら
れる（図２参照）。According to a second aspect of the present invention, the center layer is a blend of high density polyethylene and low density polyethylene, a blend of high density polyethylene and linear low density polyethylene, or a mixture of high density polyethylene and low density polyethylene. A ternary blend of polyethylene and linear low-density polyethylene, wherein the two layers sandwiching the central layer comprise linear low-density polyethylene having a density of 0.935 g / cm 3 or less and a melting point of 120-128 ° C. The layer co-extruded laminated tube is kept at a stretching temperature of 90 ° C.
A heat-shrinkable laminated film is provided, which is a laminated film uniaxially stretched in a range of up to 5 times, wherein the thickness of the central layer is 35 to 80% of the total thickness of the laminated film (FIG. 2).
【００１０】さらに、本発明の第３発明によれば、中心
層が高密度ポリエチレンと低密度ポリエチレンのブレン
ド物、高密度ポリエチレンと直鎖状低密度ポリエチレン
のブレンド物、または高密度ポリエチレンと低密度ポリ
エチレンと直鎖状低密度ポリエチレンの３元ブレンド物
からなり、前記中心層をサンドイッチする２つの層のう
ち、チューブ外側の層が密度０．９３５ｇ／cm 3 以下、
融点１２０〜１２８℃の直鎖状低密度ポリエチレンから
なり、チューブ内側の層がエチレン−酢酸ビニル共重合
物からなる３層共押出積層チューブを、チューブ状のま
ま、９０℃以下の延伸温度にて、２〜５倍の範囲で一軸
延伸した積層フィルムであって、前記中心層の厚さが積
層フィルム総厚さの３５〜８０％であることを特徴とす
る熱収縮性積層フィルムが提供せられる（図３参照）。 Further, according to the third invention of the present invention, the center
Blend of high density polyethylene and low density polyethylene
Products, high density polyethylene and linear low density polyethylene
Blend of high density polyethylene and low density poly
Ternary blend of ethylene and linear low density polyethylene
Two layers sandwiching said central layer
The outer layer of the tube has a density of 0.935 g / cm 3 or less,
From linear low density polyethylene with a melting point of 120-128 ° C
And the inner layer of the tube is ethylene-vinyl acetate copolymer
The three-layer co-extruded laminated tube made of
Also, at a stretching temperature of 90 ° C. or less, uniaxial in a range of 2 to 5 times.
A stretched laminated film, wherein the thickness of the central layer is
35 to 80% of the total thickness of the layer film
A heat-shrinkable laminated film is provided (see FIG. 3).
【００１１】以下、本発明について、詳しく説明する。Hereinafter, the present invention will be described in detail.
【００１２】本発明の積層フィルムにおける中心層は、
高密度ポリエチレンと低密度ポリエチレンのブレンド
物、高密度ポリエチレンと直鎖状低密度ポリエチレンの
ブレンド物、または高密度ポリエチレンと低密度ポリエ
チレンと直鎖状低密度ポリエチレンの３元ブレンド物か
らなる。これらのうち、３元ブレンド物からなること
が、一軸延伸を良好に行ううえで好ましい。また、高密
度ポリエチレンは延伸グレードであることが、一軸延伸
に好ましい。本発明において中心層は、高密度ポリエチ
レンと低密度ポリエチレンと直鎖状低密度ポリエチレン
の３元ブレンド物からなり、高密度ポリエチレンが延伸
グレードであることが最も好ましい。The center layer in the laminated film of the present invention comprises:
It comprises a blend of high density polyethylene and low density polyethylene, a blend of high density polyethylene and linear low density polyethylene, or a ternary blend of high density polyethylene, low density polyethylene and linear low density polyethylene. Of these, it is preferable to use a ternary blend in order to favorably perform uniaxial stretching. In addition, it is preferable that the high-density polyethylene is a stretching grade for uniaxial stretching. In the present invention, the center layer comprises a ternary blend of high-density polyethylene, low-density polyethylene, and linear low-density polyethylene, and most preferably, the high-density polyethylene is a stretch grade.
【００１３】また、本発明において、中心層を形成する
ブレンド物における高密度ポリエチレンの比率は、４０
〜８０wt% であることが好ましい。この高密度ポリエチ
レンの比率が、８０wt% 以上では、白化ないし延伸切れ
が起こり易くなり、逆に４０wt% 以下では、成膜条件が
極めて狭く、異常ネッキング現象の発生、フイッシュア
イ部の穴あき、ピンホールカットなどの延伸トラブルが
多発し易くなる。In the present invention, the ratio of the high-density polyethylene in the blend forming the center layer is 40%.
It is preferably about 80% by weight. When the ratio of the high-density polyethylene is 80% by weight or more, whitening or stretching breakage is likely to occur. Stretching troubles such as hole cuts are likely to occur frequently.
【００１４】本発明において、中心層の厚さは積層フィ
ルム全体の厚さの３５〜８０％である。中心層の厚さが
３５％以下では、収縮応力が低下し、良好な収縮仕上り
が得られない。また耐熱性も低下し、収縮トンネルの適
性温度範囲が著しく狭くなり、制約される。一方、中心
層の厚さが８０％以上では、延伸倍率を４〜５倍にした
時、縦裂けしやすくなり包装後の破袋の恐れがある。ま
た収縮応力も上がりすぎて、収縮時にシール部の破袋が
起きるケースが出てくる。中心層の厚さは、積層フィル
ム全体の厚さの４０〜６０％であることが好ましい。In the present invention, the thickness of the center layer is 35 to 80% of the total thickness of the laminated film. If the thickness of the center layer is 35% or less, the shrinkage stress is reduced, and a good shrink finish cannot be obtained. Also, the heat resistance is reduced, and the suitable temperature range of the shrink tunnel is remarkably narrowed and restricted. On the other hand, when the thickness of the center layer is 80% or more, when the stretching ratio is set to 4 to 5 times, the film tends to be vertically torn, and there is a possibility of the bag breaking after packaging. In addition, there are cases where the shrinkage stress is too high and the seal portion breaks during shrinkage. The thickness of the central layer is preferably 40 to 60% of the total thickness of the laminated film.
【００１５】第１および第２発明における中心層をサン
ドイッチする２つの層、および第３発明における中心層
をサンドイッチする２層のうちチューブ外側の層は、密
度０．９３５ｇ／cm 3 以下、融点１２０〜１２８℃の直
鎖状低密度ポリエチレンからなる。このように直鎖状低
密度ポリエチレン層を中心層に積層することによって、
５％以下の透明度を達成することができる。中心層のみ
では延伸後でも透明度が上がらず、ヘイズ１０％以下に
することはできない。また、直鎖状低密度ポリエチレン
は、低密度ポリエチレン、ＥＶＡに比べて、耐熱性があ
り、熱収縮時に被包装物と熱融着しにくい。さらに、直
鎖状低密度ポリエチレン層は、薄肉フィルム（厚さ２０
μ程度）でも十分なフィルムの引張り強度が得られる強
度補強層となっている。The two layers sandwiching the center layer in the first and second inventions, and the two layers sandwiching the center layer in the third invention, the outer layer of the tube, are dense.
It is made of linear low-density polyethylene having a degree of 0.935 g / cm 3 or less and a melting point of 120 to 128 ° C. By laminating the linear low-density polyethylene layer on the center layer in this way,
Transparencies of 5% or less can be achieved. Transparency does not increase even after stretching with only the center layer, and haze cannot be reduced to 10% or less. In addition, the linear low-density polyethylene has higher heat resistance than the low-density polyethylene and EVA, and is less likely to be thermally fused with the packaged object during heat shrinkage. Further, the linear low-density polyethylene layer is formed of a thin film (thickness: 20).
μ)) is a strength reinforcing layer that provides sufficient tensile strength of the film.
【００１６】また、第２発明においては、中心層をサン
ドイッチする２つの層のうち、チューブ内側の層を形成
する直鎖状低密度ポリエチレンは、密度０．９１０ｇ／
cm3以下の滑剤無添加グレードであることが好ましい。
このことは、９０℃以下の低温延伸でこのチューブ内側
層同志を、接着ないし剥離しない程度に密着させておく
という観点から好ましい。In the second invention, of the two layers sandwiching the central layer, the linear low-density polyethylene forming the inner layer of the tube has a density of 0.910 g /
It is preferably a lubricant-free grade of cm 3 or less.
This is preferable from the viewpoint that the inner layers of the tubes are brought into close contact with each other by a low-temperature stretching of 90 ° C. or less so as not to adhere or peel off.
【００１７】第３発明における中心層をサンドイッチす
る２層のうちチューブ内側の層は、エチレン−酢酸ビニ
ル共重合物からなる。このようにすることによって、９
０℃以下の低温延伸でこのチューブ内側層同志を、熱融
着させて完全に一体化した積層フィルムを得ることがで
きる。In the third invention, of the two layers sandwiching the center layer, the inner layer of the tube is made of an ethylene-vinyl acetate copolymer. By doing so, 9
The tube inner layers are heat-sealed at a low temperature of 0 ° C. or lower to obtain a completely integrated laminated film.
【００１８】本発明においては、延伸は９０℃以下の温
度にて行う。延伸温度が９０℃を超えると好ましい低温
収縮性（８０℃の雰囲気で２０％以上の収縮）の積層フ
ィルムが得られない。好ましい延伸温度は８０〜８７℃
である。また、延伸は２〜５倍の範囲で行う。６倍以上
に延伸した積層フィルムは、収縮しにくく収縮包装適性
が悪くなる。In the present invention, the stretching is performed at a temperature of 90 ° C. or less. When the stretching temperature exceeds 90 ° C., a laminated film having a preferable low-temperature shrinkage (shrinkage of 20% or more in an atmosphere of 80 ° C.) cannot be obtained. Preferred stretching temperature is 80-87 ° C
It is. The stretching is performed in a range of 2 to 5 times. A laminated film stretched 6 times or more is unlikely to shrink, resulting in poor suitability for shrink wrapping.
【００１９】第２および第３発明においては、３層共押
出積層チューブをチューブ状のまま延伸する。このよう
にチューブ延伸することにより、チューブ内側の層が接
着ないし剥離しない程度に密着した６層の積層フィルム
が得られ、延伸速度100m／分以上の高速延伸を行う場合
や、または、厚さ２０μｍ以下の延伸フィルムの場合に
おいても、わずかのフイッシュアイの存在による穴あ
き、ピンホールカット発生を防止することができる。In the second and third inventions, the three-layer co-extruded laminated tube is stretched in a tubular shape. By stretching the tube in this way, the inner layer of the tube comes into contact.
A six-layer laminated film adhered to such an extent that it does not adhere or peel off is obtained. Even when a high-speed stretching at a stretching speed of 100 m / min or more is performed, or when a stretched film having a thickness of 20 μm or less is used, a slight fisheye Drilling and pinhole cut due to the presence can be prevented.
【００２０】[0020]
【実施例】以下、実施例により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。EXAMPLES The present invention will now be described specifically with reference to examples, but the present invention is not limited to these examples.
【００２１】［実施例１］ 共押出３層インフレーションにて、中心層(1) は高密度
ポリエチレン（東ソー製、ニポロンハード５７００：メ
ルトインデックス１．０、密度０．９５３ｇ／cm3 ６０
wt% 、直鎖状低密度ポリエチレン（東ソー製、ニポロン
−Ｌ−Ｆ１０：メルトインデックス０．８、密度０．９
１９ｇ／cm3 ）２５wt% 、低密度ポリエチレン（東ソー
製、ペトロセン１８０：メルトインデックス２．０、密
度０．９２２ｇ／cm3 ）１５wt% のブレンド樹脂を用
い、その両外層(2) には直鎖状低密度ポリエチレン樹脂
（三井石油製、ウルトゼックス２０２０Ｌ：メルトイン
デックス２．０、密度０．９２０ｇ／cm3 ）を用いて、
２００μｍ×６００mmサイズの３層積層シートを作成し
た。その時の厚さ構成は外層(2) ／中心層(1) ／外層
(2) ＝５０μｍ／１００μｍ／５０μｍとした（図１参
照）。[0021] in [Example 1] coextrusion three-layer inflation, the central layer (1) is high-density polyethylene (manufactured by Tosoh, Nipolon Hard 5700: melt index 1.0, density 0.953 g / cm 3 60
wt%, linear low-density polyethylene (manufactured by Tosoh Corporation, Nipolon-LF10: melt index 0.8, density 0.9)
A blend resin of 19 g / cm 3 ) 25 wt%, low-density polyethylene (manufactured by Tosoh, Petrocene 180: melt index 2.0, density 0.922 g / cm 3 ) 15 wt% is used, and both outer layers (2) are linear. Using a low-density polyethylene resin (Ultzex 2020L, manufactured by Mitsui Oil; melt index 2.0, density 0.920 g / cm 3 )
A three-layer laminated sheet having a size of 200 μm × 600 mm was prepared. The thickness composition at that time is outer layer (2) / center layer (1) / outer layer
(2) = 50 μm / 100 μm / 50 μm (see FIG. 1).
【００２２】［実施例２］ 共押出３層インフレーションにて、中心層(1) は高密度
ポリエチレン（東ソー製、ニポロンハード５７００：メ
ルトインデックス１．０、密度０．９５３ｇ／cm3 ）６
０wt% 、直鎖状低密度ポリエチレン（東ソー製、ニポロ
ン−Ｌ−Ｆ１０：メルトインデックス０．８、密度０．
９１９ｇ／cm3 ）２５wt% 、低密度ポリエチレン（東ソ
ー製、ペトロセン１８０：メルトインデックス２．０、
密度０．９２２ｇ／cm3 ）１５wt% のブレンド樹脂を用
い、中心層(1) をサンドイッチする２層のうちチューブ
内側層(4) にはエチレン−酢酸ビニル共重合体（三井デ
ュポン製Ｐ１４０５ ＶＡ（酢酸ビニル）１４％）を用
い、チューブ外側層(2) には直鎖状低密度ポリエチレン
樹脂（三井石油製、ウルトゼックス２０２０Ｌ：メルト
インデックス２．０、密度０．９２０ｇ／cm3 ）を用い
て、１００μｍ×６００mm折径サイズの３層積層シート
（チューブ）を作成した。その時の厚さ構成はチューブ
外側層(2) ／中心層(1) ／チューブ内側層(4) ＝３０μ
ｍ／５０μｍ／２０μｍとした（図３参照）。Example 2 In co-extrusion three-layer inflation, the central layer (1) was made of high-density polyethylene (Nipolon Hard 5700, manufactured by Tosoh Corporation: melt index 1.0, density 0.953 g / cm 3 ) 6
0 wt%, linear low density polyethylene (manufactured by Tosoh Corporation, Nipolon-LF10: melt index 0.8, density 0.
919 g / cm 3 ) 25 wt%, low-density polyethylene (Tosoh, Petrocene 180: melt index 2.0,
Density 0.922 g / cm 3) with 15 wt% of the blend resin, the center layer (1) the tube inner layer of the two layers sandwiching (4) ethylene - vinyl acetate copolymer (manufactured by Mitsui Du Pont P1405 VA ( (Vinyl acetate) 14%), and for the tube outer layer (2), a linear low-density polyethylene resin (Ultzex 2020L, manufactured by Mitsui Oil; melt index 2.0, density 0.920 g / cm 3 ). A three-layer laminated sheet (tube) having a folded diameter of 100 μm × 600 mm was prepared. The thickness configuration at that time is a tube
Outer layer (2) / Center layer (1) / Tube inner layer (4) = 30μ
m / 50 μm / 20 μm (see FIG. 3).
【００２３】［比較例１］ 中心層を高密度ポリエチレン（東ソー製、ニポロンハー
ド５７００）単独とした以外は、実施例１と同一の方
法、条件にて３層積層シートを作成した。Comparative Example 1 A three-layer laminated sheet was prepared in the same manner and under the same conditions as in Example 1 except that the central layer was made of high-density polyethylene (Nipolon Hard 5700, manufactured by Tosoh Corporation) alone.
【００２４】実施例１および２、比較例１で作成した３
層積層シートを、一軸延伸機によって延伸温度８５℃、
延伸倍率２、３、４および５倍に延伸した結果は表１の
通りであった。Examples 3 and 4 prepared in Examples 1 and 2 and Comparative Example 1
The layer laminated sheet is stretched at a stretching temperature of 85 ° C. by a uniaxial stretching machine,
Table 1 shows the results of stretching at stretching ratios of 2, 3, 4 and 5 times.
【００２５】[0025]
【表１】 本発明による実施例１および２の３層積層シートは、２
〜５倍の延伸範囲で良好な延伸結果を得ることができ
た。[Table 1] The three-layer laminated sheets of Examples 1 and 2 according to the present invention
Good stretching results could be obtained in a stretching range of up to 5 times.
【００２６】[0026]
【発明の効果】本発明によると、低温収縮性と結束力に
優れ、かつ耐熱性があり、しかも強靭で透明性に優れる
熱収縮性包装用積層フィルムが得られる。According to the present invention, a heat-shrinkable laminated film for packaging having excellent low-temperature shrinkage and binding power, heat resistance, toughness and excellent transparency can be obtained.
【図１】本発明による積層フィルムの一例を示す断面図
である。FIG. 1 is a sectional view showing an example of a laminated film according to the present invention.
【図２】本発明による積層フィルムの他の例を示す断面
図である。FIG. 2 is a sectional view showing another example of a laminated film according to the present invention.
【図３】本発明による積層フィルムのもう一つの他の例
を示す断面図である。FIG. 3 shows another example of the laminated film according to the present invention.
It is a sectional view showing a.
(1) …中心層 (2) …外層 (3) …チューブ内側の層 (4) …チューブ内側の層 (1)… Center layer (2)… Outer layer (3)… Tube inner layer (4)… Tube inner layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−189148（ＪＰ，Ａ) 特開 平３−189147（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B32B 1/00 - 35/00 B29C 61/00 - 61/10 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-189148 (JP, A) JP-A-3-189147 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B32B 1/00-35/00 B29C 61/00-61/10
Claims (6)
リエチレンのブレンド物、高密度ポリエチレンと直鎖状
低密度ポリエチレンのブレンド物、または高密度ポリエ
チレンと低密度ポリエチレンと直鎖状低密度ポリエチレ
ンの３元ブレンド物からなり、前記中心層をサンドイッ
チする２つの層が密度０．９３５ｇ／cm3 以下、融点１
２０〜１２８℃の直鎖状低密度ポリエチレンからなる３
層共押出積層シートを、９０℃以下の延伸温度にて、２
〜５倍の範囲で一軸延伸した積層フィルムであって、前
記中心層の厚さが積層フィルム総厚さの３５〜８０％で
あることを特徴とする熱収縮性積層フィルム。1. A blend of a high-density polyethylene and a low-density polyethylene, a high-density polyethylene and a linear low-density polyethylene, or a high-density polyethylene, a low-density polyethylene and a linear low-density polyethylene. The two layers sandwiching the central layer have a density of 0.935 g / cm 3 or less and a melting point of 1
3 consisting of linear low-density polyethylene at 20 to 128 ° C
The layer coextruded laminated sheet is stretched at a stretching temperature of 90 ° C.
A heat-shrinkable laminated film, wherein the thickness of the central layer is 35 to 80% of the total thickness of the laminated film.
リエチレンのブレンド物、高密度ポリエチレンと直鎖状
低密度ポリエチレンのブレンド物、または高密度ポリエ
チレンと低密度ポリエチレンと直鎖状低密度ポリエチレ
ンの３元ブレンド物からなり、前記中心層をサンドイッ
チする２つの層が密度０．９３５ｇ／cm3 以下、融点１
２０〜１２８℃の直鎖状低密度ポリエチレンからなる３
層共押出積層チューブを、チューブ状のまま、９０℃以
下の延伸温度にて、２〜５倍の範囲で一軸延伸した積層
フィルムであって、前記中心層の厚さが積層フィルム総
厚さの３５〜８０％であることを特徴とする熱収縮性積
層フィルム。2. A blend of a high-density polyethylene and a low-density polyethylene, a high-density polyethylene and a linear low-density polyethylene, or a high-density polyethylene, a low-density polyethylene and a linear low-density polyethylene. The two layers sandwiching the central layer have a density of 0.935 g / cm 3 or less and a melting point of 1
3 consisting of linear low-density polyethylene at 20 to 128 ° C
The layer co-extruded laminated tube is a laminated film that is uniaxially stretched in a range of 2 to 5 times at a stretching temperature of 90 ° C. or less while maintaining the tubular shape, wherein the thickness of the central layer is the total thickness of the laminated film. A heat-shrinkable laminated film having a content of 35 to 80%.
ち、チューブ内側の層を形成する直鎖状低密度ポリエチ
レンが密度０．９１０ｇ／cm3 以下の滑剤無添加グレー
ドである、請求項２記載の熱収縮性積層フィルム。3. The two-layer sandwich of the center layer, wherein the linear low-density polyethylene forming the inner layer of the tube is a lubricant-free grade having a density of 0.910 g / cm 3 or less. Heat-shrinkable laminated film.
リエチレンのブレンド物、高密度ポリエチレンと直鎖状
低密度ポリエチレンのブレンド物、または高密度ポリエ
チレンと低密度ポリエチレンと直鎖状低密度ポリエチレ
ンの３元ブレンド物からなり、前記中心層をサンドイッ
チする２つの層のうち、チューブ外側の層が密度０．９
３５ｇ／cm 3 以下、融点１２０〜１２８℃の直鎖状低密
度ポリエチレンからなり、チューブ内側の層がエチレン
−酢酸ビニル共重合物からなる３層共押出積層チューブ
を、チューブ状のまま、９０℃以下の延伸温度にて、２
〜５倍の範囲で一軸延伸した積層フィルムであって、前
記中心層の厚さが積層フィルム総厚さの３５〜８０％で
あることを特徴とする熱収縮性積層フィルム。 4. A high density polyethylene and a low density polyethylene having a central layer.
Polyethylene blend, high density polyethylene and linear
Low density polyethylene blends or high density polyethylene
Tylene, low density polyethylene and linear low density polyethylene
A three-way blend of down, out of the two layers sandwiching the center layer, the density tube outer layer 0.9
35 g / cm 3 or less, made of linear low density polyethylene having a melting point of 120-128 ° C., the layers of the inner tube is ethylene - 3-layer co-extruded laminate tube consisting of vinyl acetate copolymer
At a stretching temperature of 90 ° C. or less while maintaining a tubular shape.
A laminated film uniaxially stretched in a range of up to 5 times,
The thickness of the central layer is 35 to 80% of the total thickness of the laminated film.
A heat-shrinkable laminated film, characterized in that:
密度ポリエチレンの比率が４０〜８０wt% である、請求
項１〜４のうちいずれか１項記載の熱収縮性積層フィル
ム。5. The heat-shrinkable laminated film according to claim 1, wherein the proportion of the high-density polyethylene in the blend forming the central layer is 40 to 80% by weight.
縦方向の寸法収縮率が２０％以上である、請求項１〜５
のうちいずれか１項記載の熱収縮性積層フィルム。6. The dimensional shrinkage in the vertical direction after 5 minutes in an atmosphere at a temperature of 80 ° C. is 20% or more.
The heat-shrinkable laminated film according to any one of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04027812A JP3093020B2 (en) | 1992-02-14 | 1992-02-14 | Heat shrinkable laminated film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04027812A JP3093020B2 (en) | 1992-02-14 | 1992-02-14 | Heat shrinkable laminated film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05220909A JPH05220909A (en) | 1993-08-31 |
| JP3093020B2 true JP3093020B2 (en) | 2000-10-03 |
Family
ID=12231388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04027812A Expired - Lifetime JP3093020B2 (en) | 1992-02-14 | 1992-02-14 | Heat shrinkable laminated film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093020B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3091069B2 (en) * | 1992-12-28 | 2000-09-25 | 三井化学株式会社 | Resin laminate and its use |
| EP1300238B1 (en) * | 2001-09-27 | 2014-08-27 | Flexopack S A | Multilayer packaging film and process |
| KR100825346B1 (en) * | 2003-04-03 | 2008-04-28 | 가부시키가이샤 프라임 폴리머 | Film for packaging |
| JP4624721B2 (en) * | 2004-05-21 | 2011-02-02 | 株式会社プライムポリマー | Laminated resin uniaxially stretched film |
| EP1717021B1 (en) | 2005-04-29 | 2012-06-27 | Ceisa Packaging | Heat-shrinkable film of high clarity and rigidity |
| JP2007062797A (en) * | 2005-08-31 | 2007-03-15 | Asahi Breweries Ltd | Polyethylene shrinkable film for easy opening integrated packaging |
| JP5328464B2 (en) * | 2008-09-19 | 2013-10-30 | 旭化成ケミカルズ株式会社 | Heat shrink multilayer film |
| CA2768507C (en) | 2009-08-31 | 2014-05-27 | Asahi Kasei Chemicals Corporation | Cover tape, method for manufacturing cover tape, and electronic part package |
| JP5456419B2 (en) * | 2009-08-31 | 2014-03-26 | 旭化成ケミカルズ株式会社 | Shrink film for cover tape and cover tape |
-
1992
- 1992-02-14 JP JP04027812A patent/JP3093020B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05220909A (en) | 1993-08-31 |
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