JPH0632911A - Heat-shrinkable plastic resin composition for packaging - Google Patents
Heat-shrinkable plastic resin composition for packagingInfo
- Publication number
- JPH0632911A JPH0632911A JP4213499A JP21349992A JPH0632911A JP H0632911 A JPH0632911 A JP H0632911A JP 4213499 A JP4213499 A JP 4213499A JP 21349992 A JP21349992 A JP 21349992A JP H0632911 A JPH0632911 A JP H0632911A
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- JP
- Japan
- Prior art keywords
- heat
- layer
- thickness
- film
- electron beam
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ヒートシール性が良
好で、かつ、耐熱性の優れた包装用熱収縮プラスチック
樹脂組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable plastic resin composition for packaging which has good heat-sealing properties and excellent heat resistance.
【０００２】[0002]
【従来の技術】従来、食品などの包装に用いられる熱収
縮フイルム、熱収縮チュウブとして、例えばポリエチレ
ンフイルムに電子線などの放射線を照射し、架橋反応を
生じせしめて架橋フイルムとし、次いでこのフイルムを
その融点付近の温度に加熱して延伸加工したものは一般
に知られている。この熱収縮フイルムは、無架橋の熱収
縮フイルムに比べて、その耐熱性、収縮性が優れてい
る。2. Description of the Related Art Conventionally, as a heat-shrinkable film or heat-shrinkable tube used for packaging foods, for example, a polyethylene film is irradiated with radiation such as an electron beam to cause a cross-linking reaction to form a cross-linked film. It is generally known that the material is heated to a temperature near its melting point and stretched. This heat-shrinkable film is superior in heat resistance and shrinkability to a non-crosslinked heat-shrinkable film.
【０００３】[0003]
【発明が解決しょうとする課題】しかしながら、この熱
収縮フイルムは、それ自体に架橋構造が導入されている
ためにヒートシール性が充分でなく、包装作業が効率よ
く行えないという欠点があつた。However, this heat-shrinkable film has a drawback that the heat-sealing property is not sufficient because the cross-linking structure is introduced into itself, and the packaging work cannot be performed efficiently.
【０００４】一方、フイルムに架橋構造が導入された後
に延伸されていると耐熱性が向上し、熱収縮包装形態が
良好なるため、かかる意味においては架橋構造の導入は
非常に有効である。このように架橋構造の導入は相反す
る効果を生じるものである。On the other hand, when the film is stretched after the cross-linking structure is introduced, the heat resistance is improved and the heat-shrinkable packaging form is improved, so that introduction of the cross-linking structure is very effective in this sense. In this way, the introduction of the cross-linking structure produces conflicting effects.
【０００５】この発明は、上述の点に鑑み、ヒートシー
ル性が良好で、かつ、耐熱性の優れた包装用熱収縮プラ
スチック樹脂組成物を提供することを目的とする。In view of the above points, the present invention has an object to provide a heat-shrinkable plastic resin composition for packaging, which has a good heat-sealing property and an excellent heat resistance.
【０００６】[0006]
【課題を解決するための手段】この発明は、プラスチッ
ク樹脂単独層と、プラスチック樹脂に架橋助剤を添加し
てなる添加層とを積層してなり、前記単独層のゲル分率
が３０％以下で、かつ前記添加層のゲル分率が７０％以
上になるように放射線を照射してなることを特徴とす
る。According to the present invention, a plastic resin single layer and an addition layer formed by adding a crosslinking aid to a plastic resin are laminated, and the gel fraction of the single layer is 30% or less. And radiation is applied so that the gel fraction of the additive layer is 70% or more.
【０００７】[0007]
【作用】添加剤は添加層内において架橋助剤としての作
用を果たし、これに放射線を照射することによって架橋
作用が促進される。これによって包装用熱収縮プラスチ
ック樹脂組成物の耐熱性が向上し、またゲル分率が３０
％以下の単独層の存在により、ヒートシール性が損なわ
れない。The additive acts as a cross-linking aid in the addition layer, and irradiation with radiation accelerates the cross-linking action. This improves the heat resistance of the heat-shrinkable plastic resin composition for packaging and has a gel fraction of 30.
%, The heat-sealing property is not impaired.
【０００８】前記架橋助剤の配合量としては、プラスチ
ック樹脂１００重量％に対して１〜１０重量％、特に３
重量％程度が好ましい。The amount of the cross-linking auxiliary compounded is 1 to 10% by weight, particularly 3
About wt% is preferable.
【０００９】使用できる放射線としては、α線、β線、
γ線、χ線および加速電子線などの電離性放射線などが
挙げられる。また放射線源としては、原子炉、放射性同
位元素、Ｘ線発生装置、電子線照射装置などが挙げられ
るが、その制御性や安全性などを考慮すると電子線照射
装置を用いるのが都合がよい。必要な照射線量は、被照
射体の形状、大きさ、厚さなどによって異なるが、通常
は１Ｍｒａｄ〜２０Ｍｒａｄ、好ましくは３Ｍｒａｄ〜
５Ｍｒａｄが適当である。The radiation that can be used includes α rays, β rays,
Examples include ionizing radiation such as γ rays, χ rays and accelerated electron rays. Further, examples of the radiation source include a nuclear reactor, a radioisotope, an X-ray generator, an electron beam irradiation device, and the like, and it is convenient to use the electron beam irradiation device in consideration of its controllability and safety. The required irradiation dose varies depending on the shape, size, thickness, etc. of the irradiated object, but is usually 1 Mrad to 20 Mrad, preferably 3 Mrad to
5 Mrad is suitable.
【００１０】なお、ここに使用するプラスチック樹脂と
しては、ポリエチレン（ＰＥ）、ポリ塩化ビニール（Ｐ
ＶＣ）、ナイロン、ポリプロピン・ビニールシラン共重
合体、ポリプロピン・非共役二重結合共重合体などを用
いることができる。The plastic resin used here is polyethylene (PE), polyvinyl chloride (P
VC), nylon, polypropyne / vinylsilane copolymer, polypropyne / non-conjugated double bond copolymer and the like can be used.
【００１１】前記架橋助剤としては、放射線架橋助剤と
して一般に用いられているものを用いることができ、使
用可能なもの代表的なものを列挙すれば次の通りであ
る。As the above-mentioned crosslinking aid, those generally used as a radiation crosslinking aid can be used, and the usable ones are listed below.
【００１２】アリル基を有する化合物としては、ジアリ
ルフタレート、トリアリルイソシアヌレート（ＴＡＩ
Ｃ）、トリアリルシアヌレート、トリアリルトリメリテ
ート、ジアリルフタレート、ジアリルクロレンデートな
どがある。Examples of the compound having an allyl group include diallyl phthalate and triallyl isocyanurate (TAI).
C), triallyl cyanurate, triallyl trimellitate, diallyl phthalate and diallyl chlorendate.
【００１３】アクリル基を有する化合物としては、トリ
メチロールプロパントリアクリレート（ＴＭＰＴＡ）、
トリメチロールプロパントリメタアクリレート、テトラ
エチレングリコールジメタアクリレート、ｎ−ブチルメ
タアクリレートなどがある。As the compound having an acrylic group, trimethylolpropane triacrylate (TMPTA),
Examples include trimethylolpropane trimethacrylate, tetraethylene glycol dimethacrylate, and n-butyl methacrylate.
【００１４】これら架橋助剤は、プラスチック樹脂に直
接添加して用いてもよいし、予め乳化剤または分散剤に
よってエマルジョン化した後、プラスチック樹脂エマル
ジョンに添加してもよい。These cross-linking aids may be added directly to the plastic resin for use, or may be added to the plastic resin emulsion after being emulsified with an emulsifier or dispersant in advance.
【００１５】この明細書においてゲル分率とは、次のよ
うに定義したものをいう。すなわち、試料を溶剤（１２
０℃）に６時間浸漬し、その後不溶解分をろ紙によりろ
過してからろ紙上の残渣に含まれる溶剤を１００℃×
０．０１mmＨｇで恒量になるまで乾燥し、その後不溶解
物の重量を測定する。そして浸漬前の初期重量Ｗ１と、
不溶解物の重量Ｗ２とから （Ｗ２／Ｗ１）×１００（％） によってゲル分率を求めた。但し、溶剤と試料の関係は
ポリエチレンではキシレン、ナイロン−６ではオルソク
ロロフェノール、ポリ塩化ビニルではテトラヒドロフラ
ンを用いた。In this specification, the gel fraction is defined as follows. That is, the sample is treated with a solvent (12
(0 ° C) for 6 hours, then insoluble matter is filtered through a filter paper, and the solvent contained in the residue on the filter paper is heated at 100 ° C x
It is dried at 0.01 mmHg to a constant weight, and then the insoluble matter is weighed. And the initial weight W1 before immersion,
The gel fraction was calculated from (W2 / W1) × 100 (%) from the weight W2 of the insoluble matter. However, regarding the relationship between the solvent and the sample, xylene was used for polyethylene, orthochlorophenol was used for nylon-6, and tetrahydrofuran was used for polyvinyl chloride.
【００１６】[0016]
（実施例１）図１にその断面を部分的に拡大して示すよ
うにＰＥを原料とし、ＰＥのみからなる厚さ６０μｍの
単独層１１−１１間に、ＰＥに架橋助剤としてＴＡＩＣ
を３重量％添加した厚さ６０μｍの添加層１２を配置し
た厚さ１８０μｍの３層構造のフイルム１を押しだし成
形により作り、このフイルム１に電子線照射装置によ
り、前記単独層１１のゲル分率が１５％で、添加層１２
のゲル分率が７５％になるように電子線を照射した。加
速電圧は５００ｋＶで、照射線量は３Ｍｒａｄである。(Example 1) As shown in a partially enlarged cross section of FIG. 1, PE was used as a raw material, and TAIC was used as a cross-linking aid for PE between the single layers 11-11 made of PE alone and having a thickness of 60 μm.
Was formed by extrusion molding a film 1 having a three-layer structure having a thickness of 180 μm, in which an additive layer 12 having a thickness of 60 μm added thereto was added, and the gel fraction of the single layer 11 was applied to the film 1 by an electron beam irradiation device. Is 15%, and the additive layer 12
Was irradiated with an electron beam so that the gel fraction of was 75%. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad.
【００１７】その後このフイルム１を所定の延伸条件に
て二軸方向に延伸し、厚さ２２μｍのフイルムを形成し
た。このようにして得られたフイルム１は、ＰＥのみか
らなる低架橋層１３と架橋剤の添加による高架橋層１４
との複合層として形成されており、高架橋層１４により
耐熱性が向上し、低架橋層１３によりヒートシール性を
有し、全体としてヒートシール性と耐熱性を有するフイ
ルムが得られる。Thereafter, this film 1 was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm. The film 1 thus obtained has a low cross-linking layer 13 made of PE alone and a high cross-linking layer 14 formed by adding a cross-linking agent.
The high cross-linking layer 14 improves the heat resistance, and the low cross-linking layer 13 has the heat-sealing property, so that a film having the heat-sealing property and the heat resistance as a whole can be obtained.
【００１８】（実施例２）図２に示すようにＰＥとナイ
ロン−６を原料とし、ＰＥのみからなる厚さ６０μｍの
単独層２１−２１間に、ナイロン−６に架橋助剤として
ＴＡＩＣを３重量％添加した厚さ６０μｍの添加層２２
を配置した厚さ１８０μｍの３層構造のフイルム２を押
しだし成形により作り、このフイルム２に電子線照射装
置により、前記単独層２１のゲル分率が１５％で、添加
層２２のゲル分率が８０％になるように電子線を照射し
た。加速電圧は５００ｋＶで、照射線量は３Ｍｒａｄで
ある。その後このフイルム２を所定の延伸条件にて二軸
方向に延伸し、厚さ２２μｍのフイルムを形成した。(Example 2) As shown in FIG. 2, PE and nylon-6 were used as raw materials, and TAIC as a cross-linking aid was added to nylon-6 between nylon-6 and a single layer 21-21 having a thickness of 60 μm. Addition layer 22 having a thickness of 60 μm and added by weight%
The film 2 having a three-layer structure having a thickness of 180 μm and having a thickness of 180 μm is extruded and formed, and the gel fraction of the single layer 21 is 15% and the gel fraction of the addition layer 22 is 15% by an electron beam irradiation device. The electron beam was irradiated so as to be 80%. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Thereafter, this film 2 was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００１９】（実施例３）図３に示すようにＰＥとＰＶ
Ｃを原料とし、ＰＥのみからなる厚さ６０μｍの単独層
３１−３１間に、ＰＶＣに架橋助剤としてＴＭＰＡＴを
３重量％添加した厚さ６０μｍの添加層３２を配置した
厚さ１８０μｍの３層構造のフイルム３を押しだし成形
により作り、このフイルム３に電子線照射装置により、
前記単独層３１のゲル分率が１５％で、添加層３２のゲ
ル分率が８０％になるように電子線を照射した。加速電
圧は５００ｋＶで、照射線量は３Ｍｒａｄである。その
後このフイルムを所定の延伸条件にて二軸方向に延伸
し、厚さ２２μｍのフイルムを形成した。(Embodiment 3) PE and PV as shown in FIG.
A 180-μm-thick three-layer structure in which a 60-μm-thick addition layer 32 in which 3 wt% of TMPA is added to PVC as a cross-linking agent is arranged between C-based single layers 31-31 having a thickness of 60 μm. The film 3 having the structure is extruded and formed, and the film 3 is irradiated with an electron beam irradiation device.
The electron beam was irradiated so that the gel fraction of the single layer 31 was 15% and the gel fraction of the additive layer 32 was 80%. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this film was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００２０】（実施例４）図４に示すようにＰＶＣを原
料とし、ＰＶＣのみからなる厚さ７０μｍの単独層４１
と、ＰＶＣに架橋助剤としてＴＭＰＴＡを３重量％添加
した厚さ７０μｍの添加層４２を配置した厚さ１４０μ
ｍの２層構造のフイルム４を押しだし成形により作り、
このフイルム４に電子線照射装置により、前記単独層４
１のゲル分率が０％で、添加層４２のゲル分率が７５％
になるように電子線を照射した。加速電圧は５００ｋＶ
で、照射線量は５Ｍｒａｄである。その後このフイルム
４を所定の延伸条件にて二軸方向に延伸し、厚さ２２μ
ｍのフイルムを形成した。(Embodiment 4) As shown in FIG. 4, a single layer 41 made of PVC as a raw material and made of PVC alone and having a thickness of 70 μm.
And a thickness of 140 μm in which an addition layer 42 of 70 μm in thickness in which 3 wt% of TMPTA is added as a cross-linking aid to PVC is arranged
The two-layer film 4 of m is formed by extrusion molding,
The single layer 4 is formed on the film 4 by an electron beam irradiation device.
The gel fraction of 1 is 0%, and the gel fraction of the additive layer 42 is 75%
The electron beam was irradiated so that Accelerating voltage is 500kV
The irradiation dose is 5 Mrad. After that, the film 4 is biaxially stretched under a predetermined stretching condition to have a thickness of 22 μm.
m film was formed.
【００２１】（実施例５）図５に示すようにＰＥを原料
とし、ＰＥのみからなる厚さ７０μｍの単独層５１と、
ＰＥに架橋助剤としてＴＡＩＣを３重量％添加した厚さ
７０μｍの添加層５２を配置した厚さ１４０μｍの２層
構造のフイルム５を押しだし成形により作り、このフイ
ルム５に電子線照射装置により、前記単独層５１のゲル
分率が１５％で、添加層５２のゲル分率が７５％になる
ように電子線を照射した。加速電圧は５００ｋＶで、照
射線量は３Ｍｒａｄである。その後このフイルム５を所
定の延伸条件にて二軸方向に延伸し、厚さ２２μｍのフ
イルムを形成した。(Embodiment 5) As shown in FIG. 5, PE was used as a raw material, and a single layer 51 consisting of PE and having a thickness of 70 μm was formed.
A 140 μm-thick two-layer film 5 having a 70 μm-thick addition layer 52 in which 3% by weight of TAIC is added to PE as a cross-linking aid is formed by extrusion molding. The electron beam was irradiated so that the gel fraction of the single layer 51 was 15% and the gel fraction of the additive layer 52 was 75%. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Thereafter, this film 5 was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００２２】（比較例１）ＰＥのみからなる厚さ１８０
μｍのフイルムを押しだし成形により作り、このフイル
ムに電子線照射装置により、電子線を照射した。加速電
圧は５００ｋＶで、照射線量は３Ｍｒａｄである。その
後このフイルムを所定の延伸条件にて二軸方向に延伸
し、厚さ２２μｍのフイルムを形成した。(Comparative Example 1) Thickness 180 made of PE only
A film of μm was extruded and formed, and the film was irradiated with an electron beam by an electron beam irradiation device. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this film was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００２３】（比較例２）ＰＶＣのみからなる厚さ１８
０μｍのフイルムを押しだし成形により作り、このフイ
ルムに電子線照射装置により、電子線を照射した。加速
電圧は５００ｋＶで、照射線量は３Ｍｒａｄである。そ
の後このフイルムを所定の延伸条件にて二軸方向に延伸
し、厚さ２２μｍのフイルムを形成した。(Comparative Example 2) Thickness 18 made of PVC only
A film of 0 μm was extruded and formed, and this film was irradiated with an electron beam by an electron beam irradiation device. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this film was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００２４】（比較例３）ナイロン−６と、ＰＥとから
なる厚さ１８０μｍフイルムを押しだし成形により作
り、このフイルムに電子線照射装置により、電子線を照
射した。加速電圧は５００ｋＶで、照射線量は３Ｍｒａ
ｄである。その後このフイルムを所定の延伸条件にて二
軸方向に延伸し、厚さ２２μｍのフイルムを形成した。Comparative Example 3 A 180 μm-thick film made of nylon-6 and PE was formed by extrusion molding, and this film was irradiated with an electron beam by an electron beam irradiation device. Accelerating voltage is 500kV, irradiation dose is 3Mra
d. Then, this film was biaxially stretched under predetermined stretching conditions to form a film having a thickness of 22 μm.
【００２５】これら実施例１〜５および比較例１〜３の
ヒートシール強度、熱収縮率、熱収縮性および耐熱性の
評価結果を表１に示す。以下の表において、ヒートシー
ル強度は、１２０℃にてヒートシールした後の１００℃
における剥離強さを示す。熱収縮率は、１２０℃におけ
る収縮率を示す。熱収縮性は、供試フイルムを用いてブ
ロック肉を包装し、ヒートシール後１２０℃で収縮さ
せ、その収縮状態を外観より評価（◎・・良好、×・・不
良）した。また、耐熱性は、前記ヒートシールしたブロ
ック肉を減菌のため１４０℃のオートクレーブ中に６０
秒放置し、その後の外観変化（収縮、着色、形状変化）
より評価（◎・・良好、×・・不良）した。 ＜表１＞ ヒートシール強度 熱収縮率 熱収縮性 耐熱性 （１００℃） （１２０℃） （１２０℃） （Kg/cm2） （％） 実施例１ ＞５．０ ＞２００ ◎ ◎ 実施例２ ＞５．０ ＞２００ ◎ ◎ 実施例３ ＞５．０ ＞２００ ◎ ◎ 実施例４ ＞５．０ ＞２００ ◎ ◎ 実施例５ ＞５．０ ＞２００ ◎ ◎ 比較例１ ＞５．０ ＞１００ × × 比較例２ ＞５．０ ＞１２０ × × 比較例３ ＞５．０ ＞８０ × ×Table 1 shows the evaluation results of the heat seal strength, heat shrinkage, heat shrinkage and heat resistance of Examples 1 to 5 and Comparative Examples 1 to 3. In the table below, the heat seal strength is 100 ° C. after heat sealing at 120 ° C.
2 shows the peel strength. The heat shrinkage ratio indicates the shrinkage ratio at 120 ° C. Regarding the heat shrinkability, the block meat was packaged using a test film, heat-sealed, and then shrunk at 120 ° C., and the shrunk state was evaluated from the appearance (∘ ∙∙∙∙∙∙). In addition, the heat resistance is 60% in an autoclave at 140 ° C to sterilize the heat-sealed block meat.
Leave for 2 seconds, and then change appearance (shrink, color, change shape)
It was evaluated more (◎ ・ ・ Good, × ・ ・ Poor). <Table 1> Heat seal strength Heat shrinkage rate Heat shrinkability Heat resistance (100 ° C.) (120 ° C.) (120 ° C.) (Kg / cm 2 ) (%) Example 1>5.0> 200 ◎ ◎ ◎ Example 2 ＞ 5.0 ＞ 200 ◎ ◎ Example 3 ＞ 5.0 ＞ 200 ◎ ◎ Example 4 ＞ 5.0 ＞ 200 ◎ ◎ Example 5 ＞ 5.0 ＞ 200 ◎ ◎◎ Comparative Example 1 ＞ 5.0 ＞ 100 XX Comparative Example 2>5.0> 120 XX Comparative Example 3>5.0> 80 XX
【００２６】（実施例６）図６にその断面を部分的に拡
大して示すようにＰＥを原料とし、ＰＥのみからなる厚
さ６０μｍの単独層６１−６１間に、ＰＥに架橋助剤と
してＴＡＩＣを３重量％添加した厚さ６０μｍの添加層
６２を配置した厚さ１８０μｍの３層構造のチュウブ６
を押しだし成形により作り、このチュウブ６に電子線照
射装置により、前記単独層６１のゲル分率が１５％で、
添加層６２のゲル分率が７５％になるように電子線を照
射した。加速電圧は５００ｋＶで、照射線量は３Ｍｒａ
ｄである。その後このチュウブ６を所定の延伸条件にて
一軸方向に延伸し、厚さ２２μｍのチュウブを形成し
た。(Example 6) PE is used as a raw material as shown in a partially enlarged cross-section in FIG. 6, and the PE is used as a cross-linking aid between the individual layers 61-61 having a thickness of 60 μm and made of PE alone. A tube 6 of a three-layer structure having a thickness of 180 μm, in which an addition layer 62 having a thickness of 60 μm containing 3% by weight of TAIC is arranged.
Is produced by extrusion molding, and the gel fraction of the single layer 61 is 15% on the tube 6 by an electron beam irradiation device.
The electron beam was irradiated so that the gel fraction of the added layer 62 was 75%. Accelerating voltage is 500kV, irradiation dose is 3Mra
d. Thereafter, this tube 6 was uniaxially stretched under a predetermined stretching condition to form a tube having a thickness of 22 μm.
【００２７】（実施例７）図７に示すようにナイロン−
６を原料とし、ナイロン−６のみからなる厚さ６０μｍ
の単独層７１−７１間に、ナイロン−６に架橋助剤とし
てＴＡＩＣを３重量％添加した厚さ６０μｍの添加層７
２を配置した厚さ１８０μｍの３層構造のチュウブ７を
押しだし成形により作り、このチュウブ７に電子線照射
装置により、前記単独層７１のゲル分率が０％で、添加
層７２のゲル分率が８０％になるように電子線を照射し
た。加速電圧は５００ｋＶで、照射線量は３Ｍｒａｄで
ある。その後このチュウブ７を所定の延伸条件にて一軸
方向に延伸し、厚さ２２μｍのチュウブを形成した。Example 7 As shown in FIG. 7, nylon-
Made from 6 as a raw material and made of nylon-6 only with a thickness of 60 μm
Between the individual layers 71-71 of the above, an addition layer 7 having a thickness of 60 μm in which 3% by weight of TAIC is added as a crosslinking aid to nylon-6
A tube 7 having a three-layer structure having a thickness of 180 μm in which 2 is arranged is extruded and molded, and the tube 7 is irradiated with an electron beam so that the single layer 71 has a gel fraction of 0% and the additive layer 72 has a gel fraction of 0%. Was irradiated with an electron beam so as to be 80%. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this tube 7 was uniaxially stretched under predetermined stretching conditions to form a tube 22 μm thick.
【００２８】（実施例８）図８に示すようにＰＥとナイ
ロン−６とを原料とし、ＰＥのみからなる厚さ６０μｍ
の単独層８１−８１間に、ナイロン−６に架橋助剤とし
てＴＡＩＣを３重量％添加した厚さ６０μｍの添加層８
２を配置した厚さ１８０μｍの３層構造のチュウブ８を
押しだし成形により作り、このチュウブ８に電子線照射
装置により、前記単独層８１のゲル分率が１５％で、添
加層８２のゲル分率が８０％になるように電子線を照射
した。加速電圧は５００ｋＶで、照射線量は３Ｍｒａｄ
である。その後このチュウブを所定の延伸条件にて一軸
方向に延伸し、厚さ２２μｍのチュウブを形成した。(Embodiment 8) As shown in FIG. 8, PE and nylon-6 are used as raw materials, and a thickness of 60 .mu.m composed of PE alone is used.
Between the individual layers 81-81 of the above, an addition layer 8 having a thickness of 60 μm, in which 3% by weight of TAIC is added as a cross-linking aid to nylon-6
A tube 8 having a thickness of 180 μm and having a three-layer structure having a thickness of 180 μm was extruded and formed, and the tube 8 was irradiated with an electron beam to obtain a gel fraction of the single layer 81 of 15% and a gel fraction of the additive layer 82. Was irradiated with an electron beam so as to be 80%. Accelerating voltage is 500kV, irradiation dose is 3Mrad
Is. Then, this tube was uniaxially stretched under predetermined stretching conditions to form a tube having a thickness of 22 μm.
【００２９】（実施例９）図９に示すようにＰＥとＰＶ
Ｃとを原料とし、ＰＥのみからなる厚さ７０μｍの単独
層９１と、ＰＶＣに架橋助剤としてＴＭＰＴＡを３重量
％添加した厚さ７０μｍの添加層９２を配置した厚さ１
４０μｍの２層構造のチュウブ９を押しだし成形により
作り、このチュウブ９に電子線照射装置により、前記単
独層９１のゲル分率が１５％で、添加層９２のゲル分率
が７５％になるように電子線を照射した。加速電圧は５
００ｋＶで、照射線量は３Ｍｒａｄである。その後この
チュウブを所定の延伸条件にて一軸方向に延伸し、厚さ
２２μｍのチュウブを形成した。(Embodiment 9) PE and PV as shown in FIG.
A single layer 91 made of C as a raw material and having a thickness of 70 μm and made of PE alone, and an addition layer 92 having a thickness of 70 μm in which 3% by weight of TMPTA as a crosslinking aid is added to PVC are arranged.
A 40 μm double-layered tube 9 was formed by extrusion, and the tube 9 was subjected to an electron beam irradiation device so that the single layer 91 had a gel fraction of 15% and the additive layer 92 had a gel fraction of 75%. Was irradiated with an electron beam. Accelerating voltage is 5
At 00 kV, the irradiation dose is 3 Mrad. Then, this tube was uniaxially stretched under predetermined stretching conditions to form a tube having a thickness of 22 μm.
【００３０】（比較例４）ＰＥのみからなる厚さ１８０
μｍのチュウブを押しだし成形により作り、このチュウ
ブに電子線照射装置により、電子線を照射した。加速電
圧は５００ｋＶで、照射線量は３Ｍｒａｄである。その
後このチュウブを所定の延伸条件にて一軸方向に延伸
し、厚さ２２μｍのチュウブを形成した。(Comparative Example 4) Thickness 180 made of PE only
A tube having a diameter of μm was extruded and formed, and this tube was irradiated with an electron beam by an electron beam irradiation device. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this tube was uniaxially stretched under predetermined stretching conditions to form a tube having a thickness of 22 μm.
【００３１】（比較例５）ＰＶＣのみからなる厚さ１８
０μｍのチュウブを押しだし成形により作り、このチュ
ウブに電子線照射装置により、電子線を照射した。加速
電圧は５００ｋＶで、照射線量は３Ｍｒａｄである。そ
の後このチュウブを所定の延伸条件にて一軸方向に延伸
し、厚さ２２μｍのチュウブを形成した。(Comparative Example 5) Thickness of PVC 18
A tube of 0 μm was extruded and molded, and this tube was irradiated with an electron beam by an electron beam irradiation device. The acceleration voltage is 500 kV and the irradiation dose is 3 Mrad. Then, this tube was uniaxially stretched under predetermined stretching conditions to form a tube having a thickness of 22 μm.
【００３２】（比較例６）ナイロン−６と、ＰＥとから
なる厚さ１８０μｍチュウブを押しだし成形により作
り、このチュウブに電子線照射装置により、電子線を照
射した。加速電圧は５００ｋＶで、照射線量は３Ｍｒａ
ｄである。その後このチュウブを所定の延伸条件にて一
軸方向に延伸し、厚さ２２μｍのチュウブを形成した。(Comparative Example 6) A 180 μm-thick tube made of nylon-6 and PE was formed by extrusion, and this tube was irradiated with an electron beam by an electron beam irradiation device. Accelerating voltage is 500kV, irradiation dose is 3Mra
d. Then, this tube was uniaxially stretched under predetermined stretching conditions to form a tube having a thickness of 22 μm.
【００３３】これら実施例６〜９および比較例４〜６の
ヒートシール強度、熱収縮率、熱収縮性および耐熱性の
評価結果を表２に示す。Table 2 shows the evaluation results of the heat seal strength, heat shrinkage ratio, heat shrinkability and heat resistance of Examples 6 to 9 and Comparative Examples 4 to 6.
【００３４】 ＜表２＞ ヒートシール強度 熱収縮率 熱収縮性 耐熱性 （１００℃） １２０℃収縮率 （１２０℃） （Kg/cm2） （％） 実施例６ ＞５．０ ２００ ◎ ◎ 実施例７ ＞５．０ ２００ ◎ ◎ 実施例８ ＞５．０ ２００ ◎ ◎ 実施例９ ＞５．０ ２００ ◎ ◎ 比較例４ ＞５．０ １００ × × 比較例５ ＞５．０ １００ × × 比較例６ ＞５．０ １００ × ×<Table 2> Heat Seal Strength Heat Shrinkage Heat Shrinkability Heat Resistance (100 ° C.) 120 ° C. Shrinkage (120 ° C.) (Kg / cm 2 ) (%) Example 6> 5.0 200 ◎ ◎ Implementation Example 7> 5.0 200 ◎ ◎ Example 8> 5.0 200 ◎ ◎ Example 9> 5.0 200 ◎ ◎ Comparative Example 4> 5.0 100 × × Comparative Example 5> 5.0 100 × × Comparative Example 6> 5.0 100 × ×
【００３５】[0035]
【発明の効果】以上詳述したようにこの発明によれば、
複合フイルムやチュウブとして、低架橋層と、架橋剤の
添加による高架橋層との複合層とにより形成しており、
高架橋層により耐熱性が向上し、低下橋層によりヒート
シール性を有し、全体としてヒートシール性と耐熱性を
有している。As described above in detail, according to the present invention,
As a composite film or tube, it is formed by a low cross-linking layer and a high cross-linking layer by adding a cross-linking agent.
The highly crosslinked layer improves the heat resistance, and the reduced bridge layer has the heat sealability, and has the heat sealability and heat resistance as a whole.
【図１】この発明の一実施例を示す概略断面図である。FIG. 1 is a schematic sectional view showing an embodiment of the present invention.
【図２】この発明の他の実施例を示す概略断面図であ
る。FIG. 2 is a schematic sectional view showing another embodiment of the present invention.
【図３】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 3 is a schematic sectional view showing still another embodiment of the present invention.
【図４】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 4 is a schematic sectional view showing still another embodiment of the present invention.
【図５】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 5 is a schematic sectional view showing still another embodiment of the present invention.
【図６】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 6 is a schematic sectional view showing still another embodiment of the present invention.
【図７】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 7 is a schematic sectional view showing still another embodiment of the present invention.
【図８】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 8 is a schematic sectional view showing still another embodiment of the present invention.
【図９】この発明の更に他の実施例を示す概略断面図で
ある。FIG. 9 is a schematic sectional view showing still another embodiment of the present invention.
１〜５：フイルム ６〜９：チュウブ １１、２１、３１、４１、５１、６１、７１、８１、９
１：単独層 １２、２２、３２、４２、５２、６２、７２、８２、９
２：添加層 １３、２３、３３、４３、５３、６３、７３、８３、９
３：低架橋層 １４、２４、３４、４４、５４、６４、７４、８４、９
４：高架橋層1 to 5: film 6 to 9: tube 11, 21, 31, 41, 51, 61, 71, 81, 9
1: Single layer 12, 22, 32, 42, 52, 62, 72, 82, 9
2: Additive layer 13, 23, 33, 43, 53, 63, 73, 83, 9
3: Low cross-linking layer 14, 24, 34, 44, 54, 64, 74, 84, 9
4: Viaduct layer
Claims (1)
と、プラスチック樹脂に架橋助剤を添加してなる添加層
とを積層してなり、前記単独層のゲル分率が３０％以下
で、かつ前記添加層のゲル分率が７０％以上になるよう
に放射線を照射してなることを特徴とする包装用熱収縮
プラスチック樹脂組成物。1. A single layer consisting of a plastic resin alone and an additive layer formed by adding a crosslinking aid to the plastic resin are laminated, and the gel fraction of the single layer is 30% or less, and the addition is performed. A heat-shrinkable plastic resin composition for packaging, which is obtained by irradiating radiation so that the gel fraction of the layer is 70% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213499A JPH0632911A (en) | 1992-07-17 | 1992-07-17 | Heat-shrinkable plastic resin composition for packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213499A JPH0632911A (en) | 1992-07-17 | 1992-07-17 | Heat-shrinkable plastic resin composition for packaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0632911A true JPH0632911A (en) | 1994-02-08 |
Family
ID=16640212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4213499A Pending JPH0632911A (en) | 1992-07-17 | 1992-07-17 | Heat-shrinkable plastic resin composition for packaging |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632911A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010094967A (en) * | 2008-09-19 | 2010-04-30 | Asahi Kasei Chemicals Corp | Thermal shrinking multilayer film |
-
1992
- 1992-07-17 JP JP4213499A patent/JPH0632911A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010094967A (en) * | 2008-09-19 | 2010-04-30 | Asahi Kasei Chemicals Corp | Thermal shrinking multilayer film |
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