JPS63160837A - Polypropylene group multilayer heat-shrinkable film - Google Patents
Polypropylene group multilayer heat-shrinkable filmInfo
- Publication number
- JPS63160837A JPS63160837A JP61310963A JP31096386A JPS63160837A JP S63160837 A JPS63160837 A JP S63160837A JP 61310963 A JP61310963 A JP 61310963A JP 31096386 A JP31096386 A JP 31096386A JP S63160837 A JPS63160837 A JP S63160837A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- resin
- temperature range
- polypropylene
- shrinkable film
- 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
- -1 Polypropylene group Polymers 0.000 title claims description 85
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims description 69
- 229920005989 resin Polymers 0.000 claims description 109
- 239000011347 resin Substances 0.000 claims description 109
- 239000004743 Polypropylene Substances 0.000 claims description 83
- 229920001155 polypropylene Polymers 0.000 claims description 83
- 239000010410 layer Substances 0.000 claims description 35
- 239000003208 petroleum Substances 0.000 claims description 33
- 150000003505 terpenes Chemical class 0.000 claims description 26
- 235000007586 terpenes Nutrition 0.000 claims description 26
- 239000012792 core layer Substances 0.000 claims description 24
- 238000004806 packaging method and process Methods 0.000 description 54
- 238000000034 method Methods 0.000 description 22
- 229920001577 copolymer Polymers 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000011342 resin composition Substances 0.000 description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 9
- 239000005977 Ethylene Substances 0.000 description 9
- 239000000470 constituent Substances 0.000 description 6
- 230000004927 fusion Effects 0.000 description 6
- 229920005629 polypropylene homopolymer Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 4
- 230000008602 contraction Effects 0.000 description 4
- 235000012149 noodles Nutrition 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- 241000758791 Juglandaceae Species 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229920013716 polyethylene resin Polymers 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 235000020234 walnut Nutrition 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920001083 polybutene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- MSFGZHUJTJBYFA-UHFFFAOYSA-M sodium dichloroisocyanurate Chemical compound [Na+].ClN1C(=O)[N-]C(=O)N(Cl)C1=O MSFGZHUJTJBYFA-UHFFFAOYSA-M 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000021586 packaging of beverage Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- UAJUXJSXCLUTNU-UHFFFAOYSA-N pranlukast Chemical compound C=1C=C(OCCCCC=2C=CC=CC=2)C=CC=1C(=O)NC(C=1)=CC=C(C(C=2)=O)C=1OC=2C=1N=NNN=1 UAJUXJSXCLUTNU-UHFFFAOYSA-N 0.000 description 1
- 229960004583 pranlukast Drugs 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920006300 shrink film Polymers 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明のポリプロピレン系多層熱収縮性フィルムは、商
品をラフに包んでおき、加熱装置（収縮ｋ ソー３ｃＬ
’＋ｒ：上、−ｒ加ＭＩＩＶ ｔｅｌ 大＋４−商只ｆ
ｆｉ ＴＦ２ｉｋ ｉ、−ぴったり沿って密着させる事
によりタイトな包装を行なう方式の熱収縮包装方法に用
いるものである。そして、カップ食品、乳酸菌飲料品、
紙パツク飲料品、冷凍・冷蔵食品、医薬品、エアゾール
缶、或は、文具・がん具等の日用品等の熱収縮包装用に
ｆｌＩ用されるもので、特に、自動包装を行なう際に有
効に利用されるものである。Detailed Description of the Invention (Industrial Application Field) The polypropylene multilayer heat-shrinkable film of the present invention can be used by wrapping the product roughly and using a heating device (shrink k saw 3cL).
'+r: top, -r plus MIIV tel large+4-component f
fi TF2ik i, - This is used in a heat shrink packaging method in which tight packaging is achieved by closely adhering the packaging. And cup foods, lactic acid bacteria drinks,
Paper packs are used for heat shrink packaging of beverages, frozen/refrigerated foods, pharmaceuticals, aerosol cans, and daily necessities such as stationery and toys, and are especially effective in automatic packaging. It is something that
（従来の技術）
従来より熱収縮包装分野に使用されている熱収縮性フィ
ルムとしては、ポリプロピレン樹脂やボリエヂレン樹脂
、或は、ポリ塩化ビニル樹脂等からなる種々のフィルム
が有り、しがも、数多く市販されている。中でも、ポリ
プロピレン樹脂よりなる熱収縮性フィルムは、その本来
存している透明性、光沢、防湿性、或は、無公害性等の
優れた特性によって広く一般に利用されている。しかし
、ポリプロピレン樹脂からなる熱収縮性フィルムは、ポ
リ塩化ビニル樹脂等からなる熱収縮性フィルムと比較し
て、かなり高温にしなければ熱収縮を生じさける事が出
来ず、Ｌかｔｌ−執ｆ１盆句グｉ滴性ｑ度範囲が狭く、
収縮トンネル内の時間的温度変化や場所による温度分布
のバラツキ等により、包装仕上り性が低下し、包装適性
は必ずしも良好とは言えない。(Prior art) As heat-shrinkable films conventionally used in the field of heat-shrinkable packaging, there are various films made of polypropylene resin, polyethylene resin, polyvinyl chloride resin, etc. It is commercially available. Among them, heat-shrinkable films made of polypropylene resins are widely used because of their inherent excellent properties such as transparency, gloss, moisture resistance, and non-polluting properties. However, compared to heat-shrinkable films made of polyvinyl chloride resin, etc., heat-shrinkable films made of polypropylene resin must be heated to a considerably high temperature to avoid heat shrinkage. The range of degrees is narrow,
Due to temporal temperature changes in the shrink tunnel, variations in temperature distribution depending on location, etc., the packaging quality deteriorates, and packaging suitability cannot necessarily be said to be good.
この様な欠点を解決する方法として、ポリプロピレン樹
脂にポリエチレン樹脂やポリブテン樹脂、又は、エチレ
ン−酢酸ビニル共重合体等を少虫混合させたり（例えば
、特公昭４４−４７８号公報）、或は、プロピレンにエ
チレンやブテン等を共重合させた共重合体を用いたり（
例えば、特公昭４６−４０７５号公報）さらに、ポリプ
ロピレン樹脂や上記したポリプロピレン系樹脂に石油樹
脂やテルペン樹脂を添加しく例えば、特公昭５５−５０
０６４号、特開昭４９−９９６４６号公報）、低温でら
熱収縮を起こさせる様にして、熱収縮包装適性温度範囲
を広げ、包装適性を改良しようとする試みがなされて来
ている。所が、上記方法で改良された熱収縮性フィルム
では、これら問題点は未だ十分解決されているとは言え
ない。しかも、石油樹脂やテルペン樹脂を添加した樹脂
組成よりなる熱収縮性フィルムでは、滑り性が悪くなり
、自動包装に於ける機緘適応性に劣り、作業性か低下す
るばかりか、熱収縮包装する際に、収縮トンネル内で包
装体同士が融着を生じたり、或は、内容物と熱収縮性フ
ィルムとが融着を生じる等の新たな問題を生じている。As a method to solve such drawbacks, polypropylene resin is mixed with polyethylene resin, polybutene resin, ethylene-vinyl acetate copolymer, etc. (for example, Japanese Patent Publication No. 44-478), or Using a copolymer made by copolymerizing propylene with ethylene, butene, etc.
For example, Japanese Patent Publication No. 46-4075) Furthermore, petroleum resin or terpene resin may be added to polypropylene resin or the above-mentioned polypropylene resin.
(No. 064, JP-A-49-99646), attempts have been made to expand the suitable temperature range for heat shrink packaging and improve packaging suitability by causing heat shrinkage at low temperatures. However, with the heat-shrinkable film improved by the above method, these problems cannot be said to have been sufficiently resolved. Moreover, heat-shrinkable films made of resin compositions containing petroleum resins or terpene resins have poor slipperiness, poor mechanical adaptability in automatic packaging, and workability is reduced, as well as heat-shrinkable packaging. In this case, new problems arise, such as the packaging bodies becoming fused together within the shrink tunnel, or the contents and the heat-shrinkable film being fused together.
又、ポリプロピレン系樹脂と他の熱可塑性樹脂とを積層
さける事により（例えば、特開昭５８−１６６０４９号
公報）、熱収縮包装適性温度範囲を広げ、包装適性を改
良しようとする試みがなされて来ている。しかし、この
方法では、生産時に不適格品が生じた場合にそれらの不
適格品等を再生還元し、再利用する事が不可能であるの
で、実用生産上大きな障害となっている。In addition, attempts have been made to widen the temperature range suitable for heat shrink packaging and improve packaging suitability by avoiding lamination of polypropylene resin and other thermoplastic resins (for example, JP-A-58-166049). It is coming. However, with this method, if non-conforming products are generated during production, it is impossible to recycle and reuse those non-conforming products, which is a major obstacle in practical production.
（本発明が解決しようとする問題点）
本発明は熱収縮包装法を実施する際の熱収縮適性温度範
囲を広くし、収縮トンネル温度の変動やバラツキ等が生
じても見栄の良好なる熱収縮包装仕上がりが得られ、し
かも、得られる熱収縮包装体の緊迫性にも優れたポリプ
ロピ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。そして、包装作業性の面から自動包装機に適
合した滑り性を持たせ、しかも、包装時の溶断シール性
を良くし、自動包装適性に優れたものにすると共に、収
縮トンネル内での包装体同士の融着や、熱収縮性フィル
ムと内容物との融着を生じさせない様な特性を備えたポ
リプロピ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。さらに、上記ポリプロピレン系多層熱収
縮性フィルムに於ては、実用生産性を考慮して、生産時
等に生じることのあり得べき不適格品についてもこれを
再生還元出来る様な樹脂組成物の組み合せにより製造し
ようとするものである。(Problems to be Solved by the Invention) The present invention widens the temperature range suitable for heat shrinkage when carrying out a heat shrink packaging method, and enables heat shrinkage with a good appearance even when fluctuations or variations in shrink tunnel temperature occur. The object of the present invention is to provide a polypropylene multilayer heat-shrinkable film that provides a good packaging finish and also has excellent tightness of the resulting heat-shrinkable package. From the standpoint of packaging workability, the product has a sliding property suitable for automatic packaging machines, and also has good fusing sealing properties during packaging, making it highly suitable for automatic packaging. The purpose of the present invention is to provide a polypropylene multilayer heat-shrinkable film that has characteristics that prevent fusion between the heat-shrinkable film and its contents. Furthermore, in the polypropylene multilayer heat-shrinkable film mentioned above, in consideration of practical productivity, a combination of resin compositions that can recycle and reduce non-conforming products that may occur during production, etc. It is intended to be manufactured by
（問題点を解決するための手段）
本発明は、ポリプロピレン系熱収縮性フィルムに於ける
熱収縮包装適性温度範囲や包装仕上りでの緊迫性を、さ
らには、包装作業性や該ポリプロピレン系熱収縮性フィ
ルムの生産性に及ぼす種々の問題点を解決するために、
次の様な手段を見い出したものである。即ち、本発明の
熱収縮性フィルムは、結晶性ポリプロピレン系樹脂１０
０重量部に水素化石油樹脂、及び／又は、水素化テルペ
ン樹脂を２重量部乃至３０重量部添加した樹ＩＩＩ層か
らなる芯層と、雨量外層が結晶性ポリプロピレン系樹脂
からなり、縦方向と横方向の熱収縮力が共に２０ｇを超
えている温度領域の温度幅が５０℃以上を有し、しかも
、該温度領域での熱収縮率が縦方向、横方向共に１０％
以上となる温度範囲か５０’Ｃ以上の温度幅を有する様
にした乙のである。(Means for Solving the Problems) The present invention aims to improve the temperature range suitable for heat-shrinkable packaging in a polypropylene-based heat-shrinkable film, the tightness of the packaging finish, the packaging workability, and the heat-shrinkable polypropylene-based heat-shrinkable film. In order to solve various problems affecting the productivity of film,
The following method was discovered. That is, the heat-shrinkable film of the present invention has crystalline polypropylene resin 10
The core layer is made of a tree III layer in which 0 parts by weight of hydrogenated petroleum resin and/or hydrogenated terpene resin are added, and the rain layer is made of a crystalline polypropylene resin, and The temperature range in the temperature range where the heat shrinkage force in both the transverse direction exceeds 20g is 50°C or more, and the heat shrinkage rate in the temperature range is 10% in both the longitudinal and transverse directions.
The temperature range is 50'C or more.
次に、本発明を構成する各要素について説明すると、ま
ず、本発明に於て使用しうる結晶性ポリプロピレン系樹
脂としては、結晶性ポリプロピレンホモポリマーは勿論
、プロピレンとα−オレフィンとの共重合体である結晶
性プロピレン−α−オレフィシ共重合体を使用する事が
出来る。尚、プロピレンと共重合させるα−オレフィン
としては、エチレン、或は、ブテン等の１種、又は、２
種以上を用い、しかも、共重合割合はプロピレンに対し
７ｗｔ％程度までが一般的である。さらに、本発明に於
ける結晶性ポリプロピレン系樹脂としては、上記結晶性
ポリプロピレンホモポリマーや、結晶性プロピレン−α
−オレフィン共重合体にｌ０ｗｔ％程度までのポリエチ
レン樹脂やポリブテン樹脂、或は、エチレン−酢酸ビニ
ル共重合体やエチレン−ブテン共重合体等のポリオレフ
ィン樹脂の１種、又は、２種以上を混合した樹脂組成物
を用いることも出来る。Next, each element constituting the present invention will be explained. First, crystalline polypropylene resins that can be used in the present invention include not only crystalline polypropylene homopolymers but also copolymers of propylene and α-olefin. A crystalline propylene-α-olefinic copolymer can be used. In addition, as the α-olefin to be copolymerized with propylene, one type, such as ethylene or butene, or two types can be used.
More than one species is used, and the copolymerization ratio is generally up to about 7% by weight based on propylene. Furthermore, as the crystalline polypropylene resin in the present invention, the above-mentioned crystalline polypropylene homopolymer and crystalline propylene-α
- One type or two or more types of polyolefin resins such as polyethylene resin, polybutene resin, ethylene-vinyl acetate copolymer, ethylene-butene copolymer, etc. are mixed into the olefin copolymer up to about 10 wt%. A resin composition can also be used.
又、芯層として上記結晶性ポリプロピレン系樹脂に添加
する水素化石油樹脂、或は、水素化テルペン樹脂として
は、次の様な樹脂が使用される。Further, as the hydrogenated petroleum resin or hydrogenated terpene resin added to the crystalline polypropylene resin as the core layer, the following resins are used.
即ち、石油樹脂としては、脂肪族系石油樹脂、脂環族系
石油樹脂等がある。又、テルペン樹脂としては、（Ｃｓ
Ｈｓ）ｎの組成の炭化水素化合物、及び、それから導か
れる変性化合物である。そして、これらの樹脂は押出成
形時等の熱安定性の面から水素化された樹脂であり、該
水素化率として８０％以上で、好ましくは、９５％以上
とする事が望ましい。そして、この様な水素化石油樹脂
としては、例えば、荒川林産化学工業株式会社製の“ア
ルコン”を、又、水素化テルペン樹脂としては、例えば
、安原浦詣工業株式会社製の“クリアロン”を使用する
事か出来ろ。尚、本発明に於て使用する水素化石油樹脂
、或は、水素化テルペン樹脂は、１種類でら、或は、こ
れら２種類以上を併用する事も出来る。That is, petroleum resins include aliphatic petroleum resins, alicyclic petroleum resins, and the like. In addition, as a terpene resin, (Cs
Hs) A hydrocarbon compound having a composition of n and a modified compound derived therefrom. These resins are hydrogenated resins from the viewpoint of thermal stability during extrusion molding, etc., and it is desirable that the hydrogenation rate is 80% or more, preferably 95% or more. As such a hydrogenated petroleum resin, for example, "Alcon" manufactured by Arakawa Hayashi Chemical Industry Co., Ltd., and as a hydrogenated terpene resin, for example, "Clearon" manufactured by Yasuhara Uramou Kogyo Co., Ltd. Is it possible to use it? Note that the hydrogenated petroleum resin or hydrogenated terpene resin used in the present invention may be used alone or in combination of two or more thereof.
さらに、本発明の要旨を逸脱しない範囲で、これら結晶
性ポリプロピレン系樹脂に滑剤やアンチブロッキング剤
、或は、熱安定剤や静電防止剤等を添加する事も出来る
。Furthermore, a lubricant, an anti-blocking agent, a heat stabilizer, an antistatic agent, etc. can be added to these crystalline polypropylene resins without departing from the gist of the present invention.
上記樹脂組成よりなる本発明のポリプロピレン系多層熱
収縮性フィルムは、使用する樹脂組成物が互いに容易に
相溶し合うので、その生産時等に生じる不適格品等を再
生還元する事が可能で、実用生産上非常に有益である。In the polypropylene multilayer heat-shrinkable film of the present invention having the above-mentioned resin composition, the resin compositions used are easily compatible with each other, making it possible to recycle and reduce unqualified products generated during production. , which is very useful in practical production.
次に 本発明のポリプロピレン系多層熱収縮性フィルム
の層構成としては、芯層に水素化石油樹脂や水素化テル
ペン樹脂が添加された結晶性ポリプロピレン系樹脂を、
又、両最外層にこれらの添加されていない結晶性ポリプ
ロピレン系樹脂を使用する。Next, the layer structure of the polypropylene multilayer heat-shrinkable film of the present invention includes a crystalline polypropylene resin to which a hydrogenated petroleum resin or a hydrogenated terpene resin is added in the core layer.
Further, a crystalline polypropylene resin to which these additives are not added is used for both outermost layers.
両最外層に水素化石油樹脂や水素化テルペン樹脂を添加
した結晶性ポリプロピレン系樹脂を使用すると、得られ
るポリプロピレン系多層熱収縮性フィルムの滑り性が悪
くなり、包装機械適応性が大幅に低下してしまう。又、
この様な樹脂組成物を両最外層に使用すると、熱収縮さ
せる収縮トンネル内で包装体同士が融着を生じたり、又
、熱収縮性フィルムと内容物とが融着を生じたりする等
色々の問題を生じる。前者は、水素化石油樹脂や水素化
テルペン樹脂が常温でも粘着性を有しているため、得ら
れる熱収縮性フィルムの滑り性を大幅に低下させるため
と考えられろ。又、後者は、これら水素化石油樹脂や水
素化テルペン樹脂の軟化点が低く、収縮トンネル内でこ
れら樹脂が軟化状態になっているためと考えられる。If a crystalline polypropylene resin containing hydrogenated petroleum resin or hydrogenated terpene resin is used in both outermost layers, the resulting polypropylene multilayer heat-shrinkable film will have poor slipperiness, and its adaptability to packaging machinery will be significantly reduced. I end up. or,
If such a resin composition is used for both outermost layers, various problems may occur, such as the packages may fuse together in the heat-shrinkable shrink tunnel, or the heat-shrinkable film may fuse with the contents. This causes problems. The former is thought to be because hydrogenated petroleum resins and hydrogenated terpene resins have tackiness even at room temperature, which significantly reduces the slipperiness of the resulting heat-shrinkable film. The latter is thought to be because the softening points of these hydrogenated petroleum resins and hydrogenated terpene resins are low, and these resins are in a softened state within the shrinkage tunnel.
そこで、本発明に於ては、この様な水素化石油樹脂や水
素化テルペン樹脂が添加された結晶性ポリプロピレン樹
脂層を芯層とし、両最外層は従来よｌ）ポリプロピレン
桑執１１Ｖ縮性フィルムに於て（小用されている結晶性
ポリプロピレン系樹脂組成物を用いる。そのため、得ら
れるポリプロピレン系多層熱収縮性フィルムの滑り性は
良好で、包装機械適応性にも優れ、しかし、収縮トンネ
ル内で包装体同士が融着を生じる様な事もない。Therefore, in the present invention, the crystalline polypropylene resin layer to which such hydrogenated petroleum resin or hydrogenated terpene resin is added is used as the core layer, and both outermost layers are made of the conventional polypropylene 11V shrinkable film. In this process, a crystalline polypropylene resin composition, which is commonly used, is used.As a result, the polypropylene multilayer heat-shrinkable film obtained has good slipperiness and excellent packaging machine adaptability. There is no possibility of fusion between the packages.
尚、本発明のポリプロピレン系多層熱収縮性フィルムの
層の数としては、３層構成に限定されろものではなく、
３層以上の層構成も本発明的て使用する事が出来る。例
えば、芯層が水素化石油樹脂や水素化テルペン樹脂の添
加された結晶性ポリプロピレン系樹脂よりなる複数の層
からなるものや、或は、水素化石油樹脂や水素化テルペ
ン樹脂の添加された結晶性ポリプロピレン系樹脂よりな
る層と、これら添加物を含まない結晶性ポリプロピレン
系樹脂よりなる層との複数の層からなる乙のがある。又
、６府を構成する結晶性ポリプロピレン系樹脂は、全て
同一の樹脂であってもよいし、或は、それぞれ相違する
樹脂であってもよい。Note that the number of layers of the polypropylene multilayer heat-shrinkable film of the present invention is not limited to a three-layer structure;
Layer configurations of three or more layers can also be used in accordance with the present invention. For example, the core layer consists of multiple layers of crystalline polypropylene resin to which hydrogenated petroleum resin or hydrogenated terpene resin is added, or the core layer consists of multiple layers of crystalline polypropylene resin to which hydrogenated petroleum resin or hydrogenated terpene resin is added. There is a type B which is made up of a plurality of layers: a layer made of a crystalline polypropylene resin and a layer made of a crystalline polypropylene resin that does not contain these additives. Further, the crystalline polypropylene resins constituting the six regions may be all the same resin, or may be different resins.
続いて、本発明のポリプロピレン系多層熱収縮性フィル
ムの物性と熱収縮包装適性について述べる。即ち、縦方
向と横方向の熱収縮力が共に２０ｇを超えている温度領
域の温度幅が５０℃以上を有し、しかも、該温度領域で
の熱収縮率が縦方向、横方向共に１０％以上となる温度
範囲が５０℃以上の温度幅を有する本発明のポリプロピ
レン系多層熱収縮性フィルムが、熱収縮包装適性に優れ
、良好なる包装仕上りが得られろ点について述べる。Next, the physical properties and suitability for heat shrink packaging of the polypropylene multilayer heat shrinkable film of the present invention will be described. That is, the temperature range in which the heat shrinkage force in both the longitudinal and transverse directions exceeds 20 g has a temperature range of 50°C or more, and the heat shrinkage rate in the temperature range is 10% in both the longitudinal and transverse directions. The point that the polypropylene multilayer heat-shrinkable film of the present invention having a temperature range of 50°C or more has excellent suitability for heat-shrink packaging and can provide a good packaging finish will be described below.
まず、縦方向と横方向の熱収縮力が共に２０ｇを超えて
いる温度領域の温度幅が５０℃未満のポリプロピレン系
多層熱収縮性フィルムの場合、熱収縮時に収縮トンネル
内の時間的温度変化や場所による温度分布のバラツキ等
により、或は、包装する内容物の形状等による加熱むら
等により常に均一な緊迫性を有する熱収縮包装体を得る
事が困難である。即ち、得られる熱収縮包装体の緊迫性
が劣るとの理由で、収縮トンネル内の温度を少し高目に
すると、今度は、熱収縮性フィルムの溶融、或は、破袋
を生じやすくなってしまうので、収縮トンネル内の温度
設定範囲が非常に狭く、熱収縮包装が困難である。所が
、縦方向と横方向の熱収縮力か共に２０ｇを超えている
温度領域の温度幅が５０℃以上を有するポリプロピレン
系多層熱収縮性フィルムの場合には、収縮トンネル内の
温度変化やバラツキ等が多少有っても、常に均一な緊迫
性を有する熱収縮包装体が得られ、しかも、収縮トンネ
ル温度設定範囲ら広く、熱収縮包装が容易である。尚、
熱収縮力か２０ｇ以下では緊迫性を有する熱収縮包装体
が得られないので、熱収縮性フィルムの熱収縮包装適性
を表わすための温度幅を熱収縮力か２０ｇ以下の温度領
域で限定する事は適当ではない。First, in the case of a polypropylene multilayer heat-shrinkable film whose temperature width in the temperature range is less than 50°C in which both the longitudinal and lateral heat-shrinking forces exceed 20 g, the temporal temperature change inside the shrink tunnel during heat shrinkage It is difficult to obtain a heat-shrinkable package that always has uniform tightness due to variations in temperature distribution depending on location or uneven heating due to the shape of the contents to be packaged. In other words, if the temperature inside the shrink tunnel is made a little higher because the tightness of the resulting heat-shrinkable packaging is poor, the heat-shrinkable film tends to melt or the bag breaks. Because of this, the temperature setting range inside the shrink tunnel is very narrow, making heat shrink packaging difficult. However, in the case of polypropylene-based multilayer heat-shrinkable films that have a temperature width of 50°C or more in the temperature range where both the longitudinal and lateral heat-shrinkage forces exceed 20g, temperature changes and variations within the shrink tunnel may occur. Even if there are some defects, a heat-shrinkable package with uniform tightness can always be obtained, and the shrink tunnel temperature setting range is wide, making heat-shrinkable packaging easy. still,
If the heat shrinkage force is less than 20g, a heat-shrinkable package with tightness cannot be obtained, so the temperature range for expressing the heat-shrinkable packaging suitability of a heat-shrinkable film is limited to a temperature range of less than 20g heat shrinkage force. is not appropriate.
さらに、仮に、縦方向と横方向の熱収縮力が共に２０ｇ
を超えている温度領域の温度幅が５０℃以上を有してい
ても、該温度領域での縦方向、及び横方向の熱収縮率の
うち少なくとも一方が１０％未満であるポリプロピレン
系多層熱収縮性フィルムの場合、熱収縮前の包装袋のク
ルミを十分熱収縮させる事が出来ず、良好なる熱収縮包
装体が得られない。しかも、縦方向、及び、横方向の熱
収縮率が共に１０５以上である温度範囲が、前記温度領
域内に於て、５０℃以上の温度幅でないと、縦方向と横
方向の熱収縮力が共に２０ｇを超えている温度領域の温
度幅が５０℃未満の場合と同様、緊迫性に優れ、良好な
る熱収縮包装体は得られない。そこで、得られる熱収縮
包装体にクルミが無く、緊迫性を持た仕るためには、縦
方向と横方向の熱収縮力が共に２０ｇを超えている温度
領域の温度幅が５０℃以上を存し、しかも該温度領域で
の熱収縮率が縦方向、横方向共に１０％以上となる温度
範囲が５０℃以上の温度幅を有する様にする事が必要で
ある。Furthermore, suppose that both the vertical and horizontal heat shrinkage forces are 20g.
Even if the temperature range in the temperature range exceeding 50°C is higher than 50°C, at least one of the longitudinal and transverse heat shrinkage rates in the temperature range is less than 10%. In the case of a heat-shrinkable film, the walnuts in the packaging bag before heat-shrinking cannot be sufficiently heat-shrinked, and a good heat-shrinkable package cannot be obtained. Moreover, if the temperature range in which the heat shrinkage coefficients in both the longitudinal and transverse directions are 105 or more is not within the temperature range of 50°C or more, the heat shrinkage forces in the longitudinal and transverse directions will be reduced. As in the case where the temperature width in the temperature range exceeding 20 g is less than 50° C., a good heat-shrinkable package with excellent tightness cannot be obtained. Therefore, in order for the resulting heat-shrinkable package to be free of walnuts and have a sense of tightness, the temperature range in the temperature range where the heat-shrinkage force in both the longitudinal and transverse directions exceeds 20g must be 50°C or higher. However, it is necessary to ensure that the temperature range in which the thermal shrinkage rate in the temperature range is 10% or more in both the longitudinal and lateral directions has a temperature width of 50° C. or more.
本発明のポリプロピレン系多層熱収縮性フィルムでは、
熱収縮力が２０ｇを超える温度領域の温度幅や、該温度
領域での熱収縮率が１０％以上となる温度範囲は次の様
な方法により、本発明の要件を満たすようにする事が出
来る。In the polypropylene multilayer heat-shrinkable film of the present invention,
The temperature range in which the heat shrinkage force exceeds 20 g and the temperature range in which the heat shrinkage rate is 10% or more can be made to satisfy the requirements of the present invention by the following method. .
縦方向と横方向の熱収縮力が共に２０ｇを超えている温
度領域の温度幅を５０℃以上にするために、まず、水素
化石油樹脂や水素化テルペン樹脂を添加した結晶性ポリ
プロピレン系樹脂を使用する。この様な結晶性ポリプロ
ピレン系樹脂よりなる熱収縮性フィルムは、これら水素
化石油樹脂や水素化テルペン樹脂の添加されていない結
晶性ポリプロピレン系樹脂よりなる熱収縮性フィルムよ
りも、低温より大きな熱収縮力を示す様になり該温度領
域の温度幅が広くなる。さらに、上記水素化石油樹脂や
水素化テルペン樹脂の添加された結晶性ポリプロピレン
系樹脂よりなる熱収縮性フィルムの雨量外層に、これら
水素化石油樹脂や水素化テルペン樹脂の添加されていな
い結晶性ポリプロピレン系樹脂よりなる熱収縮性フィル
ムを積層させる。この様な方法を用いる事により、水素
化石油樹脂や水素化テルペン樹脂が添加されていない結
晶性ポリプロピレン系樹脂は、これら樹脂を添加した結
晶性ポリプロピレン系樹脂よりも耐熱性に優れているの
で、高温まで大きな熱収縮力を示す様になるので、該温
度領域の温度幅を更に広くする事が出来ろ。In order to increase the temperature range to 50°C or higher in the temperature range where the heat shrinkage force in both the longitudinal and lateral directions exceeds 20g, first, a crystalline polypropylene resin to which hydrogenated petroleum resin or hydrogenated terpene resin has been added is used. use. Heat-shrinkable films made of such crystalline polypropylene resins exhibit greater heat shrinkage at low temperatures than heat-shrinkable films made of crystalline polypropylene resins to which hydrogenated petroleum resins and hydrogenated terpene resins are not added. The temperature range becomes wider. Furthermore, the outer layer of the heat-shrinkable film made of the crystalline polypropylene resin to which the hydrogenated petroleum resin or hydrogenated terpene resin is added is made of crystalline polypropylene to which the hydrogenated petroleum resin or hydrogenated terpene resin is not added. A heat-shrinkable film made of resin is laminated. By using such a method, crystalline polypropylene resin to which hydrogenated petroleum resin or hydrogenated terpene resin is not added has better heat resistance than crystalline polypropylene resin to which these resins are added. Since it shows a large thermal shrinkage force up to high temperatures, the temperature range in this temperature range can be further widened.
この際、水素化石油樹脂や水素化テルペン樹脂の添加（
ｉｌが２重量部未満では該温度領域の温度幅を広くする
効果が乏しく、３０重量部を超えると、今度は押出等加
工性に問題を生じてしまう。又、水素化石油樹脂や水素
化テルペン樹脂を含んだ芯層が薄くなりすぎて、両最外
層が厚くなりすぎたり、或は逆に、水素化石油樹脂や水
素化テルペン樹脂を含んだ芯層が厚くなりすぎて、両最
外層等が薄くなりすぎても、該温度領域の温度幅を広く
する効果が乏しい。そこで、該芯層は全体厚みに対し４
０％乃至８０％の範囲内である事が好ましい。尚、全体
厚みとしては、本発明のポリプロピレン系多層熱収縮性
フィルムが一般の熱収縮包装用として使用されるために
は、ｌθμ乃至４０ｇ程度の範囲内である。At this time, addition of hydrogenated petroleum resin or hydrogenated terpene resin (
If il is less than 2 parts by weight, the effect of widening the temperature range is poor, and if it exceeds 30 parts by weight, problems will arise in processability such as extrusion. In addition, if the core layer containing hydrogenated petroleum resin or hydrogenated terpene resin becomes too thin, the two outermost layers may become too thick, or conversely, the core layer containing hydrogenated petroleum resin or hydrogenated terpene resin may become too thin. If it becomes too thick and both outermost layers etc. become too thin, the effect of widening the temperature range in the temperature range will be poor. Therefore, the core layer has a thickness of 4
It is preferably within the range of 0% to 80%. Incidentally, in order for the polypropylene multilayer heat-shrinkable film of the present invention to be used for general heat-shrinkable packaging, the overall thickness is within the range of lθμ to about 40 g.
さらに、各層に使用する結晶性ポリプロピレン系樹脂の
種類を色々組み合せる事によっても、該温度領域の温度
幅を変える事が出来る。Furthermore, the temperature width of the temperature range can be changed by combining various types of crystalline polypropylene resins used in each layer.
次に、該温度領域内での熱収縮率が縦方向、横方向共に
１０５以上となる様な温度範囲を５０℃以上の温度幅を
有す様にするには、水素化石油樹脂や水素化テルペン樹
脂を添加した結晶性ポリプロピレン系樹脂を使用したり
、或は、製造時の積層方法や延伸方法、或は、延伸条件
や熱固定条件等を適宜選択すればよい。Next, in order to have a temperature range of 50°C or more so that the thermal shrinkage rate within the temperature range is 105 or more in both the longitudinal and lateral directions, hydrogenated petroleum resin or hydrogenated A crystalline polypropylene resin to which a terpene resin has been added may be used, or the lamination method, stretching method, stretching conditions, heat setting conditions, etc. during production may be appropriately selected.
本発明のポリプロピレン系多層熱収縮性フィルムは、芯
層に粘着性に優れた水素化石油樹脂、及び／又は、水素
化テルペン樹脂が添加されているため、溶断シール性が
良好である。即ち、溶断シールを行なう際の温度範囲が
広く、自動包装機械適性が良好で、しかも、得られるシ
ール強度が強固である。The polypropylene multilayer heat-shrinkable film of the present invention has good melt-cut sealability because a hydrogenated petroleum resin and/or a hydrogenated terpene resin with excellent adhesiveness is added to the core layer. That is, the temperature range for fusing and sealing is wide, the suitability for automatic packaging machines is good, and the resulting seal strength is strong.
本発明に於ける熱収縮力及び熱収縮率は次の様な方法に
よって測定した。まず熱収縮力は、測定しようとするポ
リプロピレン系多層熱収縮性フィルムを縦方向、横方向
それぞれ１０ｍｍ幅のタンザク状に切断し、試料とする
。その試料を４０ｍｍ間隔のチャックに弛みが無く、し
かも、無負荷の状態に挟持し、該フィルムが熱収縮を起
こさない様にチャック間隔を固定する。そして、チャッ
ク間に挟持されたままの試料を規定の温度に設定された
シリコンオイル槽に約３０秒間浸漬させ、チャック間に
生ずる最大の力を熱収縮力としてｇの単位で求めた。尚
、熱収縮力が２０ｇを超える温度領域の温度幅は、上記
方法で得られたシリコンオイル槽の温度と、その際生じ
る熱収縮力との関係より求めた。The heat shrinkage force and heat shrinkage rate in the present invention were measured by the following method. First, to measure the heat shrinkage force, a polypropylene multilayer heat shrinkable film to be measured is cut into a tanzak shape with a width of 10 mm in both the longitudinal and transverse directions to prepare a sample. The sample is held between chucks spaced at 40 mm intervals without any slack and under no load, and the chuck spacing is fixed so that the film does not undergo thermal contraction. Then, the sample held between the chucks was immersed in a silicone oil bath set at a specified temperature for about 30 seconds, and the maximum force generated between the chucks was determined as the thermal shrinkage force in g. The temperature range in the temperature range where the heat shrinkage force exceeds 20 g was determined from the relationship between the temperature of the silicone oil bath obtained by the above method and the heat shrinkage force generated at that time.
次に、熱収縮率は測定しようとするポリプロピレン系多
層熱収縮性フィルムを縦方向、横方向が共に１００ｍｍ
の正方形に切断し、得られた試料の規定の温度に設定さ
れたシリコンオイル槽に約３０秒間浸漬させて熱収縮さ
せ、縦方向、横方向それぞれの熱収縮工を熱収縮萌の長
さの１００分率で求めた。尚、熱収縮率が縦方向、横方
向共に１０５以上となる温度範囲の温度幅は、上記方法
で得られたシリコンオイル槽の温度と、その際生じる熱
収縮率との関係より求めた。Next, the heat shrinkage rate is determined by measuring the polypropylene multilayer heat shrinkable film that is 100 mm in both the vertical and horizontal directions.
The obtained sample was cut into squares, immersed in a silicone oil bath set at the specified temperature for about 30 seconds to heat shrink, and the length of the heat shrink in both the vertical and horizontal directions was adjusted to the length of the heat shrink. It was calculated as a percentage of 100. The temperature range in which the thermal contraction rate is 105 or more in both the vertical and horizontal directions was determined from the relationship between the temperature of the silicone oil bath obtained by the above method and the thermal contraction rate generated at that time.
本発明のポリプロピレン系多層熱収縮性フィルムを製造
する方法としては特に限定されるものではないが、次の
様な方法により製造されるのが好ましい。即ち、複数の
押出機を用いて積層グイより積層シートを共押出しする
。そして該積層シートを冷却固化さ仕た後、延伸可能な
温度まで再加熱して、縦方向、横方向共に少なくとも３
．０倍以上延伸した後冷却させる。延伸方法としてはテ
ンタ一方式、或は、インフレーション方式とも可能であ
るが、縦方向と横方向の熱収縮ｍを同程度にする事が容
易であるので、インフレーション方式により製造するの
が好ましい。そのために、積層シートは多層サーキュラ
−ダイを用い、多層チューブ状シートとして得る事が必
要がある。そして、得られたポリプロピレン系多層熱収
縮性フィルムは、自然放置していると該フィルム自体の
持っている自然収縮性によって変形や表面状態が悪化す
るのでこれを防止するために、熱収縮性を余り低下させ
ない様に熱処理して、自然収縮量を減らす事がより好ま
しい。Although the method for producing the polypropylene multilayer heat-shrinkable film of the present invention is not particularly limited, it is preferably produced by the following method. That is, a laminated sheet is coextruded from a laminated gou using a plurality of extruders. After the laminated sheet is cooled and solidified, it is reheated to a temperature that allows it to be stretched, and is then
．． After stretching 0 times or more, it is cooled. As a stretching method, either a tenter type or an inflation type can be used, but it is preferable to manufacture by the inflation type since it is easy to make the heat shrinkage m in the longitudinal direction and the lateral direction to the same level. Therefore, it is necessary to use a multilayer circular die to obtain the laminated sheet as a multilayer tubular sheet. The obtained polypropylene multilayer heat-shrinkable film will be deformed and the surface condition will deteriorate due to the natural shrinkage of the film itself if it is left to naturally shrink. It is more preferable to reduce the amount of natural shrinkage by heat treatment so as not to reduce it too much.
本発明のポリプロピレン系多層熱収縮性フィルムを用い
た熱収縮包装方法としては、従来より使用されている熱
収縮包装ラインをそのまま使用する事が出来る。しかも
、従来のポリプロピレン樹脂よりなる熱収縮性フィルム
と比較して、収縮トンネル内の温度をンビャーに設定し
なくても、又、多少温度むらが有っても良好なる熱収縮
包装体を得る事が出来る。As a heat shrink packaging method using the polypropylene multilayer heat shrink film of the present invention, a conventional heat shrink packaging line can be used as is. Moreover, compared to conventional heat-shrinkable films made of polypropylene resin, it is possible to obtain a good heat-shrinkable package even if the temperature inside the shrink tunnel does not have to be set to an extreme level and even if there is some temperature unevenness. I can do it.
（発明の効果）
本発明のポリプロピレン系多層熱収縮性フィルムは、熱
収縮包装時の適性温度範囲が広くなり、収縮トンネル温
度の時間的変化や場所による温度分布のバラツキ等が多
少有っても、又、設定温度が多少ラフでも常に緊迫性に
優れ、良好なる熱収縮包装体となるものである。又、良
好なる滑り性と優れた溶断シール性を有しているので、
自動包装適性に優れ、しかも、収縮トンネル内で包装体
同士が融着したり、内容物と熱収縮性フィルムとが融着
したりする様な事もない。(Effects of the Invention) The polypropylene multilayer heat-shrinkable film of the present invention has a wide suitable temperature range for heat-shrink packaging, even if there are temporal changes in the shrink tunnel temperature or variations in temperature distribution depending on location. Moreover, even if the set temperature is somewhat rough, the package always has excellent tightness and can be a good heat-shrinkable package. In addition, it has good sliding properties and excellent sealing properties, so
It has excellent suitability for automatic packaging, and there is no possibility that the packages will fuse together in the shrink tunnel or that the contents and the heat-shrinkable film will fuse together.
さらに、本発明のポリプロピレン系多層熱収縮性フィル
ムは、生産時等に生じる不適格品等の再生還元が可能で
あるので、実用生産上有益である。Furthermore, the polypropylene multilayer heat-shrinkable film of the present invention is useful in practical production since it is possible to recycle unqualified products generated during production.
尚、本発明のポリプロピレン系多層熱収縮性フィルムは
、本来ポリプロピレン系樹脂が有している透明性、光沢
、防湿性、或は、無公害性等の優（実施例）
以下に実施例及び比較例を示し、本発明をより具体的に
説明する。In addition, the polypropylene multilayer heat-shrinkable film of the present invention has excellent transparency, gloss, moisture resistance, or non-pollution properties that polypropylene resin originally has (Examples) Examples and comparisons are shown below. The present invention will be explained in more detail by way of examples.
実施例！。Example! .
結晶性エチレン・プロピレン共重合体（エチレン含有率
３．２ｗｔ％）を両外層とし、該エチレン・プロピレン
共重合体に水素化石油樹脂（荒川林産化学工業株式会社
製“アルコン”）を５重量部添加された樹脂を芯層とす
るチューブ状共押出し積層未延伸原反フィルムを３台の
押出機と３層共押出し用サーキュラ−ダイによって得た
。尚、上記共押出し成型直後に従来の水冷方式によって
急冷させた。Crystalline ethylene/propylene copolymer (ethylene content: 3.2 wt%) is used as both outer layers, and 5 parts by weight of hydrogenated petroleum resin ("Alcon" manufactured by Arakawa Forestry Chemical Industry Co., Ltd.) is added to the ethylene/propylene copolymer. A tubular coextrusion laminated unstretched raw film having the added resin as a core layer was obtained using three extruders and a circular die for three-layer coextrusion. Immediately after the above-mentioned coextrusion molding, quenching was performed using a conventional water cooling method.
得られた積層未延伸原反フィルムの両外層は共に４０μ
で、芯層は１３０μであった。Both outer layers of the obtained laminated unstretched raw film have a thickness of 40 μm.
The core layer had a thickness of 130μ.
この積層未延伸原反フィルムを従来のインフレーション
方式によって縦方向、横方向共に４．０倍延伸し、積層
二軸延伸フィルムを得た。この積層二軸延伸フィルムに
施緩を与えなから熱固定を行ない、全体厚みが約１５μ
で、折径が約６２０ｍｍのポリプロピレン系多層熱収縮
性フィルムを得た。This laminated unstretched original film was stretched by 4.0 times in both the longitudinal and transverse directions by a conventional inflation method to obtain a laminated biaxially stretched film. This laminated biaxially stretched film was heat-set without being loosened, and the total thickness was approximately 15 μm.
Thus, a polypropylene multilayer heat-shrinkable film having a folded diameter of about 620 mm was obtained.
得られたポリプロピレン系多層熱収縮性フィルムを用い
、即席カップラーメンの自動熱収縮包装試験を行なった
。その結果、自動包装時にフィルムの滑り性に起因する
トラブルもなく、溶断シール性ら良好で、自動包装適性
に優れたものであった。又、熱収縮時に収縮トンネル内
で包装体同士が融着を生じたり、或は、内容物である即
席カップラーメンの容器と熱収縮性フィルムとが融着を
生じる様な事もなかった。しかも、収縮トンネル内の温
ｌｆｆ１１６０℃を上下！５℃程度変化させても、得ら
れる熱収縮包装体の緊迫性に変化を生じる様な事らなく
、良好なる仕上りが得られた。Using the obtained polypropylene multilayer heat-shrinkable film, an automatic heat-shrink packaging test for instant cup noodles was conducted. As a result, there were no troubles caused by the slipperiness of the film during automatic packaging, and the film had good fusing sealing properties and was excellent in suitability for automatic packaging. Furthermore, there was no occurrence of fusion between the packages in the shrink tunnel during heat shrinkage, or fusion between the contents of the instant cup noodle container and the heat-shrinkable film. What's more, the temperature inside the contraction tunnel is up and down 1160℃! Even when the temperature was changed by about 5°C, there was no change in the tightness of the resulting heat-shrinkable package, and a good finish was obtained.
尚、該ポリプロピレン系多層熱収縮性フィルムの熱収縮
力が縦方向、横方向共に２０ｇを超える温度領域の温度
幅は７０℃で、該温度領域に於て、縦方向、横方向の熱
収縮率が共に１０％以上である温度範囲も７０℃の温度
幅を有し、本発明の構成要件を満たすものであった。In addition, the temperature range in the temperature range where the heat shrinkage force of the polypropylene multilayer heat-shrinkable film exceeds 20 g in both the longitudinal and transverse directions is 70°C, and the heat shrinkage rate in the longitudinal and transverse directions is 70°C. The temperature range in which both were 10% or more also had a temperature width of 70°C, which satisfied the constituent requirements of the present invention.
実施例２゜
実施例１と同様の押出機とダイを使用し、同じ方法によ
って、一方の外層が結晶性ポリプロピレンホモポリマー
で、もう一方の外層が結晶性エチレン・プロピレン共重
合体（エチレン含有率３，２ｗｔ％）、芯層が結晶性エ
チレン−ブテン−プロピレン共重合体（エチレン含有率
２，１ｗｔ％、ブテン含有率４．２ｗＬ％）に水素化テ
ルペン樹脂（安原油脂工業株式会社製“クリアロン”）
を８重量部添加した樹脂からなるデユープ状共押出し積
層未延伸原反フィルムを得た。この積層未延伸原反フィ
ルムの両外層は共に７３μで、芯層は１４５μであった
。Example 2 Using the same extruder and die as in Example 1 and using the same method, one outer layer was a crystalline polypropylene homopolymer and the other outer layer was a crystalline ethylene-propylene copolymer (ethylene content 3.2 wt%), the core layer is a crystalline ethylene-butene-propylene copolymer (ethylene content 2.1 wt%, butene content 4.2 wL%) and a hydrogenated terpene resin (“Clearon” manufactured by Yasushi Oil Industries Co., Ltd.). ”)
A duplex-shaped coextrusion laminated unstretched raw film made of a resin to which 8 parts by weight of was added was obtained. Both outer layers of this laminated unstretched raw film had a thickness of 73μ, and the core layer had a thickness of 145μ.
得られた積層未延伸原反フィルムを実施例Ｉと同様の方
法で延伸及び熱固定を行ない、全体厚みが約２０μで折
径が約６２Ｏｎｏｎのポリプロピレン系多層熱収縮性フ
ィルムを得た。得られたポリプロピレン系多層熱収縮性
フィルムを用い、エアゾール缶の自動熱収縮包装試験を
行なった。尚、包装時に外側がポリプロピレンホモポリ
マー石で、内側がエチレン・プロピレン共重合体層とな
る様にした。その結果、実施例Ｉと同様自動包装適性に
優れ、しかも、収縮トンネル内で融着を生じる等のトラ
ブルも無かった。又、収縮トンネル温度は１７０℃に設
定したが、その設定温度が多少ラフでも、得られる熱収
縮包装体は緊迫性を有し、良好なる仕上りであった。The obtained laminated unstretched original film was stretched and heat-set in the same manner as in Example I to obtain a polypropylene multilayer heat-shrinkable film having an overall thickness of about 20 μm and a fold diameter of about 62 Onon. Using the obtained polypropylene multilayer heat-shrinkable film, an automatic heat-shrink packaging test for aerosol cans was conducted. In addition, at the time of packaging, the outer layer was made of polypropylene homopolymer stone, and the inner layer was made of an ethylene-propylene copolymer layer. As a result, similar to Example I, it had excellent suitability for automatic packaging, and there were no problems such as fusion in the shrink tunnel. Further, the shrink tunnel temperature was set at 170° C., but even if the set temperature was somewhat rough, the resulting heat-shrinkable package had tightness and a good finish.
尚、該ポリプロピレン系多層熱収縮性フィルムの熱収縮
力が縦方向、横方向共に２０ｇを超える温度領域の温度
幅は７５℃で、該温度領域に於て、縦方向、横方向の熱
収縮率が共に１０２以上である温度範囲も６０℃の温度
幅を存し、本発明の構成要件を満たすものであった。The temperature range in the temperature range where the heat shrinkage force of the polypropylene multilayer heat-shrinkable film exceeds 20 g in both the longitudinal and transverse directions is 75°C, and the heat shrinkage rate in the longitudinal and transverse directions in this temperature range is 75°C. The temperature range in which both are 102 or more also had a temperature width of 60°C, which satisfied the constituent requirements of the present invention.
比較例１、
実施例１に於て、芯層に添加する水素化石油樹脂の蚤を
４０重量部としたほかは全て同様の方法でポリプロピレ
ン系多層熱収縮性フィルムの作製を試みた。しかし、共
押出し成型時に芯層の押出しむらにより厚み変動を生じ
ると共に延伸安定性が悪く、ポリプロピレン系多層熱収
縮性フィルムを得る事が出来なかった。In Comparative Example 1 and Example 1, an attempt was made to produce a polypropylene multilayer heat-shrinkable film in the same manner as in Comparative Example 1 and Example 1, except that 40 parts by weight of the hydrogenated petroleum resin was added to the core layer. However, during coextrusion molding, uneven extrusion of the core layer caused thickness fluctuations and poor stretching stability, making it impossible to obtain a polypropylene multilayer heat-shrinkable film.
尚、該芯層に使用された樹脂組成は本発明の構成要件を
満たさないものであった。Incidentally, the resin composition used for the core layer did not satisfy the constituent requirements of the present invention.
比較例２゜
実施例Ｉと同様の押出機とダイを使用し、同じ方法によ
って、両外層が結晶性エチレン・プロピレン共重合体（
エチレン含有率３．２ｗｔ％）に水素化石油樹脂（荒川
林産化学工業株式会社製“アルコン“）を１２重量部添
加された樹脂を使用し、芯層には両外層に使用したエチ
レン・プロピレン共重合体を使用して、デユープ状共押
出し積層未延伸原反フィルムを得た。この積属未延伸原
反フィルムの両外層は共に４０μで、芯層は１３０μで
あった。Comparative Example 2 Using the same extruder and die as in Example I and using the same method, both outer layers were made of crystalline ethylene-propylene copolymer (
A resin containing 12 parts by weight of hydrogenated petroleum resin ("Alcon" manufactured by Arakawa Forestry Chemical Industry Co., Ltd.) is used in the ethylene content (3.2 wt%), and the core layer contains both the ethylene and propylene used in both outer layers. Using the polymer, a duplex coextrusion laminated unstretched raw film was obtained. Both outer layers of this laminated unstretched raw film had a thickness of 40μ, and the core layer had a thickness of 130μ.
得られた積層未延伸原反フィルムを実施例Ｉと同様の方
法で延伸及び熱固定を行ない、全体厚みが約１５μで折
径が約６２０ｍｍのポリプロピレン系多層熱収縮性フィ
ルムを得た。The obtained laminated unstretched original film was stretched and heat-set in the same manner as in Example I to obtain a polypropylene multilayer heat-shrinkable film having an overall thickness of about 15 μm and a fold diameter of about 620 mm.
得られたポリプロピレン系多層熱収縮性フィルムを用い
て、実施例１と同様、即席カップラーメンの自動熱収縮
包装試験を行なった。しかし、フィルムの滑り性が悪く
、自動包装機械に適応し難＜、シかも、収縮トンネル内
で包装体同士や内容物と熱収縮性フィルムとが融着を生
じやすかった。Using the obtained polypropylene multilayer heat-shrinkable film, an automatic heat-shrink packaging test for instant cup noodles was conducted in the same manner as in Example 1. However, the slipperiness of the film was poor, making it difficult to adapt to automatic packaging machines, and the heat-shrinkable film was likely to cause fusion between the packages or between the contents and the heat-shrinkable film inside the shrink tunnel.
尚、該ポリプロピレン系多層熱収縮性フィルムの両外層
及び芯層に使用された樹脂組成は、本発明の構成要件を
満たさないものであった。The resin compositions used for both outer layers and the core layer of the polypropylene multilayer heat-shrinkable film did not meet the requirements of the present invention.
比較例３゜
実施例Ｉと同様の押出機とダイを使用し、同じ方法によ
って、両外層が結晶性ポリプロピレンホモポリマーで、
芯層が上記ポリプロピレンホモポリマーに水素化石油樹
脂（荒川林産化学工業株式会社製“アルコン”）を１重
量部添加した樹脂からなるチューブ状共押出し積層未延
伸原反フィルムを得た。この積層未延伸原反フィルムの
両外層は共に４０μで、芯層は１３０μであった。Comparative Example 3 Using the same extruder and die as in Example I and using the same method, both outer layers were made of crystalline polypropylene homopolymer,
A tubular coextrusion laminated unstretched raw film was obtained in which the core layer was made of the polypropylene homopolymer and 1 part by weight of hydrogenated petroleum resin ("Alcon" manufactured by Arakawa Hayashi Chemical Industry Co., Ltd.). Both outer layers of this laminated unstretched raw film had a thickness of 40μ, and the core layer had a thickness of 130μ.
得られた積層未延伸原反フィルムを実施例１と同様の方
法で延伸及び熱固定を行ない、全体厚みが約１５μで折
径が約６２０ｍｍのポリプロピレン系多層熱収縮性フィ
ルムを得た。The obtained laminated unstretched original film was stretched and heat-set in the same manner as in Example 1 to obtain a polypropylene multilayer heat-shrinkable film having an overall thickness of about 15 μm and a fold diameter of about 620 mm.
得られたポリプロピレン系多層熱収縮性フィルムを用い
て、実施例１と同様、即席カップラーメンの自動熱収縮
包装試験を行なった。その結果、フィルムの滑り性は良
く、自動包装機械に適応し易いが、溶断シール性が不十
分であった。又、収縮トンネル内の温度が最適温度より
も多少でも低下すると得られる熱収縮包装体の緊迫性が
劣り、又、多少でも高くなると得られる熱収縮包装体の
表面が溶融し、白化状態を呈す様になり、共に良好なる
仕上りが得られなかった。Using the obtained polypropylene multilayer heat-shrinkable film, an automatic heat-shrink packaging test for instant cup noodles was conducted in the same manner as in Example 1. As a result, the film had good slipperiness and was easy to adapt to automatic packaging machines, but the melt sealability was insufficient. Furthermore, if the temperature inside the shrink tunnel is even slightly lower than the optimum temperature, the tightness of the resulting heat-shrinkable packaging will be poor, and if it is even slightly higher, the surface of the resulting heat-shrinkable packaging will melt and appear white. In both cases, a good finish could not be obtained.
尚、該ポリプロピレン系多層熱収縮性フィルムは、その
芯層に添加された水素化石油樹脂が１重屯部で、本発明
の構成要件を満たさないしのであった。しかも、熱収縮
力が縦方向、横方向共に２０ｇを超える温度領域の温度
幅は５０℃未満で、この点についても本発明の構成要件
を満たさないものであった。Note that the polypropylene multilayer heat-shrinkable film did not satisfy the constituent requirements of the present invention since the core layer contained only one tonne of hydrogenated petroleum resin. Moreover, the temperature range in the temperature range where the heat shrinkage force exceeds 20 g in both the longitudinal and lateral directions was less than 50° C., and in this respect also did not satisfy the constituent requirements of the present invention.
比較例４゜
結晶性エチレン・ブテン・プロピレン共重合体（エチレ
ン含有率２．１ｗｔ％、ブテン含有率４．２ｗｔ％）に
水素化石油樹脂（荒川林産化学工業株式会社製“アルコ
ン”）を５重量部添加した樹脂組成物より、従来のイン
フレーンヨン二輛延伸方法によって厚さ２０μのポリプ
ロピレン系熱収縮性フィルムを得た。そして、該ポリプ
ロピレン系熱収縮性フィルムの両性面に、結晶性エチレ
ン・プロピレン共重合体（エチレン含有率３．２ｗｔ％
）よりなる厚さｌＯμの非収縮タイプのフィルムをドラ
イラミネートして、ポリプロピレン系多層熱収縮性フィ
ルムを得た。Comparative Example 4: Hydrogenated petroleum resin (“Alcon” manufactured by Arakawa Forestry Chemical Industry Co., Ltd.) was added to crystalline ethylene-butene-propylene copolymer (ethylene content 2.1 wt%, butene content 4.2 wt%). A polypropylene heat-shrinkable film having a thickness of 20 .mu.m was obtained from the resin composition containing the added parts by weight by a conventional two-car inflator stretching method. Then, a crystalline ethylene/propylene copolymer (ethylene content: 3.2 wt%) was applied to both sides of the polypropylene heat-shrinkable film.
) was dry laminated to obtain a polypropylene multilayer heat-shrinkable film having a thickness of lOμ.
得られたポリプロピレン系多層熱収縮性フィルムを用い
て、実施例２と同様、エアゾール缶の自動熱収縮包装試
験を行なった。その結果、フィルムの滑り性は良く、又
、溶断シール性も良好で、自動包装機械に適応し易かっ
た。しかし、収縮トンネル内の温度を高目に設定しない
と熱収縮が不十分で、熱収縮前の包装袋のクルミを十分
熱収縮させろ事が出来ず、又、少しでも高目にしすぎる
と得られる熱収縮包装体の表面が溶融し、白化状態を呈
する様になる。Using the obtained polypropylene multilayer heat-shrinkable film, an automatic heat-shrink packaging test for aerosol cans was conducted in the same manner as in Example 2. As a result, the film had good slipperiness and good melt-cut sealing properties, making it easy to adapt to automatic packaging machines. However, if the temperature inside the shrink tunnel is not set to a high temperature, the heat shrinkage will be insufficient, and the walnuts in the packaging bag before heat shrinking will not be able to be sufficiently heat-shrinked. The surface of the heat-shrinkable package melts and appears white.
尚、該ポリプロピレン系多層熱収縮性フィルムの熱収縮
力が縦方向、横方向共に２０ｇを超える温度領域の温度
幅は５０℃以上であったが、該温度領域に於て、縦方向
、横方向の熱収縮率か共に１０％以上である温度範囲は
５０℃未満で、本発明の構成要件を満たさない乙のであ
った。The temperature range in the temperature range where the heat shrinkage force of the polypropylene multilayer heat-shrinkable film exceeds 20 g in both the longitudinal and transverse directions was 50°C or higher; The temperature range in which the thermal shrinkage rates of both were 10% or more was less than 50°C, which did not meet the constituent requirements of the present invention.
Claims (1)
石油樹脂、及び／又は、水素化テルペン樹脂を２重量部
乃至３０重量部添加した樹脂からなる芯層と、両最外層
が結晶性ポリプロピレン系樹脂からなり、縦方向と横方
向の熱収縮力が共に２０ｇを超えている温度領域の温度
幅が５０℃以上を有し、しかも、該温度領域での熱収縮
率が縦方向、横方向共に１０％以上となる温度範囲が５
０℃以上の温度幅を有するポリプロピレン系多層熱収縮
性フィルム。1. A core layer made of a resin obtained by adding 2 to 30 parts by weight of a hydrogenated petroleum resin and/or a hydrogenated terpene resin to 100 parts by weight of a crystalline polypropylene resin, and both outermost layers are made of a crystalline polypropylene resin. The temperature range in which the heat shrinkage force in both the longitudinal and transverse directions exceeds 20 g has a temperature range of 50°C or more, and the heat shrinkage rate in the temperature range is 10 in both the longitudinal and transverse directions. The temperature range where the temperature exceeds 5%
A polypropylene multilayer heat-shrinkable film with a temperature range of 0°C or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61310963A JPS63160837A (en) | 1986-12-25 | 1986-12-25 | Polypropylene group multilayer heat-shrinkable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61310963A JPS63160837A (en) | 1986-12-25 | 1986-12-25 | Polypropylene group multilayer heat-shrinkable film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63160837A true JPS63160837A (en) | 1988-07-04 |
| JPH0570583B2 JPH0570583B2 (en) | 1993-10-05 |
Family
ID=18011512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61310963A Granted JPS63160837A (en) | 1986-12-25 | 1986-12-25 | Polypropylene group multilayer heat-shrinkable film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63160837A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0763422A1 (en) * | 1995-09-13 | 1997-03-19 | W.R. Grace & Co.-Conn. | Multi-layer shrink film comprising low modulus polypropylene |
| JP2004306588A (en) * | 2003-03-27 | 2004-11-04 | Futamura Chemical Industries Co Ltd | Biaxially stretched double layer film |
-
1986
- 1986-12-25 JP JP61310963A patent/JPS63160837A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0763422A1 (en) * | 1995-09-13 | 1997-03-19 | W.R. Grace & Co.-Conn. | Multi-layer shrink film comprising low modulus polypropylene |
| JP2004306588A (en) * | 2003-03-27 | 2004-11-04 | Futamura Chemical Industries Co Ltd | Biaxially stretched double layer film |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0570583B2 (en) | 1993-10-05 |
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