JPH05329995A - Polyolefinic heat-shrinkable multilayered film and shrink packing method using the same - Google Patents
Polyolefinic heat-shrinkable multilayered film and shrink packing method using the sameInfo
- Publication number
- JPH05329995A JPH05329995A JP4163839A JP16383992A JPH05329995A JP H05329995 A JPH05329995 A JP H05329995A JP 4163839 A JP4163839 A JP 4163839A JP 16383992 A JP16383992 A JP 16383992A JP H05329995 A JPH05329995 A JP H05329995A
- Authority
- JP
- Japan
- Prior art keywords
- film
- heat
- shrinkable
- shrinkage
- polyolefin
- 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
- 238000000034 method Methods 0.000 title claims description 28
- 238000012856 packing Methods 0.000 title abstract 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 29
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- -1 polypropylene Polymers 0.000 claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 claims abstract description 14
- 229920001155 polypropylene Polymers 0.000 claims abstract description 14
- 239000012792 core layer Substances 0.000 claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims description 22
- 239000010410 layer Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229920013716 polyethylene resin Polymers 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 5
- 239000011342 resin composition Substances 0.000 claims description 4
- 229920006257 Heat-shrinkable film Polymers 0.000 abstract description 16
- 238000004806 packaging method and process Methods 0.000 description 39
- 229920000915 polyvinyl chloride Polymers 0.000 description 10
- 239000004800 polyvinyl chloride Substances 0.000 description 10
- 229920001577 copolymer Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 229920006300 shrink film Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920005673 polypropylene based resin Polymers 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005678 polyethylene based resin Polymers 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229920005679 linear ultra low density polyethylene Polymers 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ピロースリーブ包装方
式による缶、瓶、乾電池などの集積包装に適した機械適
性、ヒートシール性及び包装仕上がりのよいポリオレフ
ィン系熱収縮性多層フィルム、及び、それを用いたピロ
ースリーブ収縮包装方法に関するものである。FIELD OF THE INVENTION The present invention relates to a polyolefin heat shrinkable multi-layer film which is suitable for integrated packaging of cans, bottles, dry batteries, etc. by a pillow sleeve packaging system and has good heat sealability and packaging finish, and it. The present invention relates to a pillow sleeve shrink wrapping method using.
【０００２】[0002]
【従来の技術】従来から被包装物を熱収縮性フィルムで
収縮包装することは被包装物を強固に結束できること、
不規則な形状の被包装物も美しく包装できること及び自
動包装に適していることなどの理由から広く利用されて
いる。これらの収縮包装に使用される熱収縮性フィルム
は、被包装物の形状、出荷形態、包装速度、包装機械等
に応じて選択される包装方式（例えば、スリーブ方式、
ハーフスリーブラップ方式、ピロー方式、ピロースリー
ブ方式、四方シール方式、パレット方式等）によって要
求される特性も異なっている。2. Description of the Related Art Conventionally, shrink-wrapping an object to be packaged with a heat-shrinkable film can firmly bind the object to be packaged,
It is widely used because it can beautifully package irregularly shaped objects and is suitable for automatic packaging. The heat-shrinkable film used for these shrink wrappings is a packaging system (for example, a sleeve system, which is selected according to the shape of the article to be packaged, the shipping form, the packaging speed, the packaging machine, etc.
The characteristics required by the half sleeve wrap method, pillow method, pillow sleeve method, four-way seal method, pallet method, etc. are also different.
【０００３】ピロースリーブ方式による収縮包装は缶ビ
ール、缶ジュース、瓶詰め清涼飲料水、乾電池などの集
積包装に利用されており、ピロースリーブ方式のなかで
も長さ方向の一定間隔毎に、幅方向に断続する切り離し
用パーフォレーションを有する熱収縮性フィルムで被包
装物を筒状に覆い、加熱して収縮包装させる際に熱と収
縮応力を利用してパーフォレーション部で自己切断させ
ることを利用した包装方法（特公昭５６−１２５３３号
公報）はフィルムの切断工程が不用で高速化が可能なこ
と、仕上がりが良好なこと、自動包装により適している
ことなどの理由で利用範囲が広がってきている。このピ
ロースリーブ包装には、横方向の収縮率が縦方向の収縮
率よりも大きいこと、熱収縮する温度範囲が広く、しか
も低温収縮性を有すること、扱いやすく包装仕上がりが
よいことなどの特性が要求されている。The shrink-sleeved packaging by the pillow sleeve system is used for the integrated packaging of canned beer, canned juice, bottled soft drink, dry battery, etc. Among the pillow sleeve systems, the shrink packaging is performed at regular intervals in the length direction and in the width direction. A packaging method that uses a heat-shrinkable film having intermittent perforations for covering the object to be packaged in a tubular shape and uses heat and shrinkage stress to self-cut at the perforation portion when heat-shrink-wrapping ( Japanese Examined Patent Publication No. 56-12533) has been widely used due to the fact that the film cutting process is not necessary and can be speeded up, the finish is good, and it is more suitable for automatic packaging. This pillow sleeve package has the characteristics that the shrinkage rate in the horizontal direction is larger than that in the vertical direction, the temperature range for heat shrinkage is wide, the shrinkage property at low temperature is low, and the package finish is easy to handle. Is required.
【０００４】それらの条件を満たしたポリ塩化ビニル
系、ポリエチレン系の横方向の収縮率の大きいフィルム
が従来から広く用いられている。しかしながら、ポリ塩
化ビニルフィルムは高価な上にヒートシール性に乏し
く、廃棄物の焼却の際には塩素ガスが発生するという問
題があった。また、ポリエチレン系の熱収縮性フィルム
では耐熱性と収縮応力が乏しく、且つ透明性にも問題が
あった。一方、ポリプロピレン系熱収縮性フィルムの場
合はヒートシール性と低温収縮性に問題があった。これ
らの問題を解決するものとしてポリエチレン系樹脂とポ
リプロピレン系樹脂を組み合わせたものも多く提案され
ているが、ポリ塩化ビニルに匹敵する性能を有するピロ
ースリーブ包装に適したポリオレフィン系の熱収縮性フ
ィルムを得ることは困難であった。Films of polyvinyl chloride type and polyethylene type having a large shrinkage ratio in the lateral direction which satisfy these conditions have been widely used. However, the polyvinyl chloride film is expensive and poor in heat-sealing property, and there is a problem that chlorine gas is generated when waste is incinerated. Further, the polyethylene-based heat-shrinkable film has poor heat resistance and shrinkage stress, and has a problem in transparency. On the other hand, in the case of polypropylene-based heat-shrinkable film, there were problems in heat sealability and low-temperature shrinkability. As a solution to these problems, many combinations of polyethylene resin and polypropylene resin have been proposed, but a polyolefin-based heat-shrinkable film suitable for pillow sleeve packaging having performance comparable to polyvinyl chloride has been proposed. It was difficult to get.
【０００５】更に、ピロースリーブ包装が長さ方向の一
定間隔毎に幅方向に断続する切り離し用パーフォレーシ
ョンを有する熱収縮性フィルムで被包装物を筒状に覆
い、加熱して収縮包装させる際に、熱と収縮応力を利用
してパーフォレーション部で自己切断させることを利用
した包装方法を採用した場合には、上記特性に加えてパ
ーフォレーション加工性、切り離し性も必要となること
から、それに適したポリオレフィン系の熱収縮性フィル
ムを提供することは困難であった。Further, when the pillow sleeve package covers the article to be packaged in a tubular shape with a heat-shrinkable film having a perforation for separation which is intermittent in the width direction at regular intervals in the length direction, and heat-shrink-wraps it, If a packaging method that uses self-cutting at the perforation part by utilizing heat and shrinkage stress is used, in addition to the above characteristics, perforation processability and separability are also required. It has been difficult to provide such a heat-shrinkable film.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、熱収縮率が
ピロースリーブ包装に適し、熱収縮する温度範囲が広
く、しかもヒートシール性、低温収縮性、耐熱性、パー
フォレーションでの切り離し性に優れ、機械適性と包装
仕上がりのよいポリオレフィン系の熱収縮性フィルム、
及び、これを用いたピロースリーブ収縮包装方法を提供
することを目的とする。DISCLOSURE OF THE INVENTION The present invention has a heat shrinkage ratio suitable for pillow sleeve packaging, has a wide temperature range for heat shrinkage, and is excellent in heat sealability, low temperature shrinkability, heat resistance, and detachability by perforation. , Heat-shrinkable polyolefin-based film with good mechanical suitability and packaging finish,
Another object of the present invention is to provide a pillow sleeve shrink wrapping method using the same.
【０００７】[0007]
【課題を解決するための手段】本発明によれば、芯層と
両表面層から構成され、該表面層がプロピレン含量８５
〜９６ｗｔ％のポリプロピレン系樹脂からなり、該芯層
がポリプロピレン系樹脂とポリエチレン系樹脂との樹脂
組成物からなり、全構成樹脂中のプロピレン含量が７０
〜８５ｗｔ％であって、１２０℃における縦方向の収縮
率が２５〜４５％、横方向の収縮率が縦方向の収縮率の
１．２〜３．５倍であることを特徴とするポリオレフィ
ン系熱収縮性多層フィルムが提供され、また、前記ポリ
オレフィン系熱収縮性多層フィルムに、長さ方向の一定
間隔毎に、該フィルムの幅方向に断続する切り離し用パ
ーフォレーションを設けたことを特徴とする前記ポリオ
レフィン系熱収縮性多層フィルムが提供され、また、前
記ポリオレフィン系熱収縮性多層フィルムを用い、被包
装物を筒状に覆い、加熱することにより該フィルムを収
縮させることを特徴とするピロースリーブ収縮包装方法
が提供され、更に、前記パーフォレーションを設けたポ
リオレフィン系熱収縮性多層フィルムを用い、被包装物
を筒状に覆い、加熱することにより該フィルムを収縮さ
せ、同時に熱と該フィルムの収縮応力を利用して、該パ
ーフォレーション部で自己切断させることを特徴とする
ピロースリーブ収縮包装方法が提供され、更にまた、前
記被包装物が、乾電池の集積体であることを特徴とする
前記ピロースリーブ収縮包装方法が提供される。According to the present invention, it comprises a core layer and both surface layers, said surface layer having a propylene content of 85.
To 96 wt% polypropylene-based resin, the core layer is made of a resin composition of polypropylene-based resin and polyethylene-based resin, and the propylene content in all the constituent resins is 70.
Polyolefin system characterized in that the shrinkage in the longitudinal direction at 120 ° C is 25 to 45% and the shrinkage in the lateral direction is 1.2 to 3.5 times the shrinkage in the longitudinal direction. A heat-shrinkable multi-layer film is provided, and the polyolefin-based heat-shrinkable multi-layer film is provided with a separation perforation that is intermittent in the width direction of the film at regular intervals in the length direction. Provided is a polyolefin-based heat-shrinkable multi-layer film, and a pillow sleeve shrinkage characterized in that the polyolefin-based heat-shrinkable multi-layer film is used to cover an object to be packaged in a tubular shape and shrink the film by heating. A wrapping method is provided, and a perforated polyolefin-based heat-shrinkable multi-layer film is used to cover the article to be packaged in a tubular shape. A pillow sleeve shrink wrapping method is provided, characterized in that the film is shrunk by doing so, and at the same time, the film is self-cut at the perforation portion by utilizing heat and shrinkage stress of the film. The pillow sleeve shrink wrapping method is provided by being a dry battery integrated body.
【０００８】即ち、前記構成を有するポリオレフィン系
熱収縮性多層フィルムは、プロピレン成分が全構成成分
の７０〜８５ｗｔ％と多いにもかかわらず、熱収縮する
温度範囲も広く、低温収縮性に優れている。またヒート
シール性、耐熱性にも優れているのでピロースリーブ包
装、特に前記切り離し用パーフォレーションを利用した
包装に適用した場合の、パーフォレーション部での切り
離し性、機械適性、包装仕上がりもよいことを見いだし
本発明を完成するに至ったのである。That is, the polyolefin heat-shrinkable multilayer film having the above-mentioned constitution has a wide temperature range for heat-shrinking and is excellent in low-temperature shrinkability, although the propylene component is as large as 70 to 85 wt% of all the constituents. There is. It is also found to have good heat-sealing properties and heat resistance, so that when applied to pillow sleeve packaging, especially packaging that uses the above-mentioned perforation for separation, the perforation has good separation properties, mechanical suitability, and packaging finish. The invention was completed.
【０００９】本発明にいうポリプロピレン系樹脂は、プ
ロピレンを主成分とするプロピレン−α−オレフィン共
重合体を意味し、例えばプロピレン−エチレン共重合
体、プロピレン−ブテン共重合体、プロピレン−エチレ
ン−ブテン３元共重合体などが挙げられる。これらのポ
リプロピレン系樹脂の融点は通常１２５〜１５０℃であ
り、融点が１２８〜１４２℃のものが好ましい。また、
該樹脂のメルトインデックス（以下ＭＩと称す。）は
０．５〜１０、好ましくは１．０〜６．０のものが適し
ている。The polypropylene resin referred to in the present invention means a propylene-α-olefin copolymer containing propylene as a main component, and includes, for example, propylene-ethylene copolymer, propylene-butene copolymer, propylene-ethylene-butene. Examples include terpolymers and the like. The melting point of these polypropylene resins is usually 125 to 150 ° C, and the melting point of 128 to 142 ° C is preferable. Also,
A suitable melt index (hereinafter referred to as MI) of the resin is 0.5 to 10, preferably 1.0 to 6.0.
【００１０】ポリエチレン系樹脂としては、直鎖状低密
度ポリエチレン、直鎖状超低密度ポリエチレンなどのエ
チレン−α−オレフィン共重合体や、エチレン−酢酸ビ
ニル共重合体などから選ばれた１種または２種以上を混
合した樹脂組成物が挙げられ、これらの中でもエチレン
−α−オレフィン共重合体が最も好ましい。As the polyethylene resin, one kind selected from ethylene-α-olefin copolymers such as linear low-density polyethylene and linear ultra-low-density polyethylene, ethylene-vinyl acetate copolymer and the like, or The resin composition which mixed 2 or more types is mentioned, and among these, the ethylene-alpha-olefin copolymer is the most preferable.
【００１１】これらのポリプロピレン系樹脂、ポリエチ
レン系樹脂には滑剤、アンチブロッキング剤、粘着性付
与剤、帯電防止剤、防曇剤等の添加剤を必要に応じて加
えてもなんらさしつかえない。Additives such as a lubricant, an anti-blocking agent, a tackifier, an antistatic agent and an antifogging agent may be added to these polypropylene resin and polyethylene resin, if necessary.
【００１２】以下、本発明のポリオレフィン系熱収縮性
多層フィルムを図１に基づいて説明する。本発明の熱収
縮性多層フィルムにおいて、表面層１１にはプロピレン
含量８５〜９６ｗｔ％のポリプロピレン系樹脂を用い
る。ピロースリーブ包装においてはかなりの高速で包装
を行うため加熱炉５３は高めの温度が設定されており、
表面層１１はその熱風の影響を最も受けやすい。したが
って、プロピレン含量が８５ｗｔ％未満のポリプロピレ
ン系樹脂を表面層１１に使用すると耐熱性が不足し熱の
ため白化したり、切れやすくなったり、表面状態が悪く
なる。更に、加熱収縮後に応力緩和が起こりやすくな
り、外観の良好なタイトな包装が得られなくなる。ま
た、フィルムの腰が弱くなるので機械適性も悪い。一
方、プロピレン含量が９６ｗｔ％を超えるとヒートシー
ル性が乏しくなる。ここでプロピレン含量は表面層全体
に占める値を意味し、上記範囲外のプロピレン含量を有
するポリプロピレン系樹脂を２種以上組み合わせて使用
しても平均のプロピレン含量が上記範囲を満足していれ
ば何ら差し支えない。The polyolefin heat-shrinkable multilayer film of the present invention will be described below with reference to FIG. In the heat shrinkable multilayer film of the present invention, the surface layer 11 is made of polypropylene resin having a propylene content of 85 to 96 wt%. In the pillow sleeve packaging, a high temperature is set in the heating furnace 53 in order to perform packaging at a considerably high speed,
The surface layer 11 is most susceptible to the hot air. Therefore, when a polypropylene-based resin having a propylene content of less than 85 wt% is used for the surface layer 11, the heat resistance is insufficient, and heat causes whitening, easy breakage, and poor surface condition. Furthermore, stress relaxation is likely to occur after heat shrinkage, making it impossible to obtain tight packaging with a good appearance. In addition, since the film becomes less stiff, mechanical suitability is poor. On the other hand, when the propylene content exceeds 96 wt%, the heat sealability becomes poor. Here, the propylene content means a value occupying the entire surface layer, and even if two or more polypropylene resins having a propylene content outside the above range are used in combination, if the average propylene content satisfies the above range, It doesn't matter.
【００１３】芯層１２には前記したポリプロピレン系樹
脂とポリエチレン系樹脂との樹脂組成を用いる。ポリプ
ロピレン系樹脂とポリエチレン系樹脂との混合比は全体
のプロピレン含量が７０〜８５ｗｔ％を満たす範囲内で
あればいかなる比率も可能であるが、重量比としては、
７０〜９０：１０〜３０の範囲が好ましい。芯層１２に
ポリエチレン系樹脂を併用することによって表面層の耐
熱性を低下させずに熱収縮性多層フィルム１に低温収縮
性、柔軟性が付与できる。The core layer 12 uses the resin composition of the above-mentioned polypropylene resin and polyethylene resin. The mixing ratio of the polypropylene-based resin and the polyethylene-based resin can be any ratio as long as the total propylene content is within the range of 70 to 85 wt%, but the weight ratio is
The range of 70 to 90:10 to 30 is preferable. By using the polyethylene resin in the core layer 12 in combination, low-temperature shrinkability and flexibility can be imparted to the heat-shrinkable multilayer film 1 without lowering the heat resistance of the surface layer.
【００１４】そして、該多層フィルムの全構成樹脂中の
プロピレン含量を７０〜８５ｗｔ％の範囲にする。プロ
ピレン含量が７０ｗｔ％未満ではフィルムの腰がなくな
り機械適性と耐熱性が悪くなる。特に、切り離し用パー
フォレーション２を利用した包装に適用した場合には、
フィルムが柔らかすぎてパーフォレーション形成用の刃
が入らないとか、パーフォレーション２での自己切断が
うまくできない等の問題を生ずる。また、含量が８５ｗ
ｔ％を超えると、熱収縮する温度範囲が高温側に片寄っ
て狭くなり、低温収縮性に欠けるばかりか、収縮応力が
高くなって加熱収縮時にパーフォレーション２で自己切
断する前に被包装物同志が引き寄せられてしまい切断が
できなくなる。特に、乾電池のように軽量の被包装物６
０をピロースリーブ包装する場合にこの傾向は顕著とな
る。なお、本発明の熱収縮性多層フィルム１には、両表
面層と芯層からなる３層形成のものばかりでなく、両表
面層と芯層とを主構成要素とし３層以上の種々の構成の
ものも含まれる。Then, the propylene content in all the constituent resins of the multilayer film is set in the range of 70 to 85 wt%. If the propylene content is less than 70% by weight, the film becomes stiff and the mechanical suitability and heat resistance deteriorate. Especially when applied to packaging that uses the separation perforation 2,
There are problems that the film is too soft and the blade for forming the perforation does not enter, and that the self-cutting in the perforation 2 cannot be performed well. Also, the content is 85w
When it exceeds t%, the temperature range of heat shrinking is narrowed to the high temperature side, and not only the low temperature shrinkage is lacking but also the shrinkage stress becomes high, so that when the heat shrinks, the objects to be packaged do not self-cut by the perforations 2. It will be pulled and you will not be able to cut it. In particular, a lightweight packaged object 6 such as a dry battery
This tendency becomes remarkable when 0 is wrapped in a pillow sleeve. The heat-shrinkable multi-layer film 1 of the present invention is not limited to a three-layer structure including both surface layers and a core layer, but various structures having three or more layers with the both surface layers and the core layer as main constituent elements. Also included are.
【００１５】更に、前記構成の熱収縮性多層フィルム１
の１２０℃における縦方向の収縮率が２５〜４５％、横
方向の収縮率が縦方向の収縮率の１．２〜３．５倍であ
る必要がある。従来から、ピロースリーブ包装の場合、
横方向の収縮率が縦方向の収縮率よりも大きい必要があ
るとされており、縦方向で１８％前後、横方向で５０〜
６０％程度のポリ塩化ビニル製の収縮フィルムが使用さ
れている。しかしながら、ポリオレフィン系熱収縮性フ
ィルムの場合、従来のポリ塩化ビニル製の収縮フィルム
と同じ収縮率では機械適性、包装仕上がりが悪く、収縮
率が本発明の範囲を満たした場合にのみ良好なピロース
リーブ包装が可能である。すなわち、縦方向の収縮率が
２５％未満では全体的な包装仕上がりと、結束力が悪
く、特にパーフォレーション２での切り離し性に欠け、
４５％を超えるとスリーブ面４がめくれあがるのでよく
ない。また、縦方向と横方向の収縮率の差が１．２倍未
満では結束力、パーフォレーション２での切り離し性が
悪くなる。Further, the heat-shrinkable multi-layer film 1 having the above structure
The longitudinal shrinkage at 120 ° C. is 25 to 45%, and the transverse shrinkage is 1.2 to 3.5 times the longitudinal shrinkage. Traditionally, for pillow sleeve packaging,
It is said that the shrinkage rate in the horizontal direction must be higher than the shrinkage rate in the vertical direction.
A shrink film made of about 60% polyvinyl chloride is used. However, in the case of a polyolefin-based heat-shrinkable film, at the same shrinkage ratio as that of a conventional polyvinyl chloride shrink film, mechanical suitability and packaging finish are poor, and a good pillow sleeve only when the shrinkage ratio satisfies the range of the present invention. Can be packaged. That is, when the shrinkage ratio in the longitudinal direction is less than 25%, the overall packaging finish and the binding force are poor, and the separation property particularly in the perforation 2 is lacking,
If it exceeds 45%, the sleeve surface 4 is turned up, which is not good. Further, if the difference between the contraction rates in the longitudinal direction and the transverse direction is less than 1.2 times, the binding force and the detachability at the perforation 2 are deteriorated.
【００１６】このような縦・横方向の収縮率を有する収
縮性フィルムは縦方向と横方向の延伸倍率を調節するこ
とにより製造できる。この場合、縦方向の延伸倍率は
１．５〜３．５倍が好ましく、横方向の延伸倍率は３．
０〜１５．０倍が好ましい。A shrinkable film having such a shrinkage ratio in the longitudinal and transverse directions can be produced by adjusting the stretching ratio in the longitudinal and transverse directions. In this case, the draw ratio in the machine direction is preferably 1.5 to 3.5, and the draw ratio in the transverse direction is 3.
0 to 15.0 times is preferable.
【００１７】本発明の熱収縮性多層フィルム１を製造す
るには環状ダイもしくは、Ｔダイを用いた溶融共押出法
が好適であるが、その他公知の方法でもよい。延伸法は
ロール延伸、テンター延伸等の組み合わせによる逐次２
軸延伸、チューブラー法、テンター法による同時２軸延
伸の何れの方法でもよい。A melt coextrusion method using an annular die or a T die is suitable for producing the heat-shrinkable multilayer film 1 of the present invention, but other known methods may be used. The stretching method is a sequential 2 by a combination of roll stretching, tenter stretching, etc.
Any of axial stretching, tubular method, and simultaneous biaxial stretching by a tenter method may be used.
【００１８】このようにして得られた熱収縮性多層フィ
ルム１の表面層１１に必要に応じて、コロナ放電処理、
酸処理、火炎処理等の表面活性化処理を施して印刷、金
属蒸着などの加工を施すこともさしつかえない。If necessary, the surface layer 11 of the heat-shrinkable multilayer film 1 thus obtained is subjected to corona discharge treatment,
It is also possible to perform a surface activation treatment such as an acid treatment or a flame treatment, and then perform a process such as printing or metal deposition.
【００１９】次に、本発明のポリオレフィン系熱収縮性
多層フィルムを用いたピロースリーブ収縮包装方法につ
いて、図２に基づいて説明する。供給ロールより繰り出
された熱収縮性多層フィルム１に、パーフォレーター５
１により、該フィルムの長さ方向の一定間隔毎に、該フ
ィルムの幅方向にパーフォレーション２を形成し、被包
装物６０を筒状に覆い、シール機５２を用いて該フィル
ム１の両端をシールし、シール部３を設ける。このよう
にして得られた、内部に被包装物６０の挿入された、熱
収縮性多層フィルム１からなる筒状体を加熱炉５３の内
部を通過させることにより加熱し、該フィルム１を収縮
させ、同時に、熱と該フィルム１の収縮応力を利用する
ことにより、該パーフォレーション２の部分で自己切断
させることにより包装体６１を得る。Next, a pillow sleeve shrink wrapping method using the polyolefin heat shrinkable multilayer film of the present invention will be described with reference to FIG. On the heat-shrinkable multilayer film 1 fed from the supply roll, the perforator 5
1, the perforations 2 are formed in the width direction of the film at regular intervals in the length direction of the film, the article to be packaged 60 is covered in a tubular shape, and both ends of the film 1 are sealed using the sealing machine 52. Then, the seal portion 3 is provided. The tubular body made of the heat-shrinkable multi-layer film 1 having the article to be packaged 60 inserted therein is heated by passing through the heating furnace 53 to shrink the film 1. At the same time, the package 61 is obtained by self-cutting at the portion of the perforation 2 by utilizing heat and the contraction stress of the film 1.
【００２０】図３に、本発明のポリオレフィン系熱収縮
性多層フィルム１を用い、本発明のピロースリーブ収縮
包装方法により得られた包装体６１を示す。FIG. 3 shows a package 61 obtained by the pillow sleeve shrink wrapping method of the present invention using the polyolefin heat shrinkable multilayer film 1 of the present invention.
【００２１】[0021]
【作用】本発明のポリオレフィン系熱収縮性多層フィル
ムにおいては、表面層がプロピレン含量が８５〜９６ｗ
ｔ％のポリプロピレン系樹脂であることから良好な耐熱
性とヒートシール性を有し、芯層がポリプロピレン系樹
脂とポリエチレン系樹脂のブレンド物からなり、全体の
プロピレン含量が７０〜８５ｗｔ％であるので熱収縮す
る温度範囲が広く、低温収縮性、柔軟性に優れている。
このフィルムはパーフォレーション２による切り離し性
も良好であり、ポリ塩化ビニル製の収縮フィルムとほぼ
同等の機械適性を有し、ヒートシール性にも優れ、包装
仕上がりの良いピロースリーブ包装がポリオレフィン系
の収縮フィルムで可能となった。In the polyolefin heat-shrinkable multilayer film of the present invention, the surface layer has a propylene content of 85 to 96 w.
Since it is a polypropylene resin of t%, it has good heat resistance and heat sealability, the core layer is made of a blend of polypropylene resin and polyethylene resin, and the total propylene content is 70 to 85 wt%. It has a wide temperature range for heat shrinkage, and has excellent low temperature shrinkability and flexibility.
This film has good detachability by perforation 2, has mechanical compatibility almost equal to that of a shrink film made of polyvinyl chloride, has excellent heat sealability, and has a good packaging finish Pillow sleeve packaging is a polyolefin-based shrink film. It became possible with.
【００２２】[0022]
【実施例】以下に、本発明を詳細に説明する。なお、本
実施例における機械的、物理的性質は以下の方法によっ
て測定した。 〈引張強度、伸び〉ＡＳＴＭ Ｄ８８２に準拠して、フ
ィルムの縦方向、及び横方向について測定した。 〈収縮率〉ＪＩＳ Ｚ１７０９に準拠して、フィルムの
縦方向、及び横方向について測定した。 〈収縮応力〉所定温度のグリセリンバスに試料フィルム
を浸し初期の最大収縮応力を、縦方向、及び横方向につ
いて測定した。試料幅：１０ｍｍ、チャック間距離：３
０ｍｍ 〈パーフォレーショイン形成性〉パーフォレーション形
成用の刃によるパーフォレーション２の形成性を評価し
た。 ○：問題なく形成できる。 ×：フィルムが破れたり、穴が明かない場合がある。 〈切り離し性〉加熱収縮時のパーフォレーション２での
自己切断性を評価した。 ○：各パーフォレーション２で切り離される。 ×：切り離しできずに包装体６１がつながってしまう。 〈ヒートシール性〉１．５ｍの高さから包装体を落下さ
せた後のシール部の状態を評価した。 ○：シール部での破袋無し。 ×：シール部での破袋有り。 〈耐熱性〉加熱時にフィルムが溶融のため白化している
かどうかを目視で判断した。 ○：白化無し。 ×：白化有り。 〈スリーブ面の仕上がり〉包装後のスリーブ面の仕上が
り状態を目視で評価した。 ○：良好 ×：スリーブ面に皺やめくれが有る。 〈結束力〉包装後の被包装物の結束状態で評価した。 ○：良好。 △：ゆるみ小。 ×：ゆるみ大。The present invention will be described in detail below. The mechanical and physical properties in this example were measured by the following methods. <Tensile Strength, Elongation> According to ASTM D882, the film was measured in the machine direction and the machine direction. <Shrinkage> Based on JIS Z1709, the film was measured in the machine direction and the machine direction. <Shrinkage stress> The sample film was immersed in glycerin bath at a predetermined temperature, and the initial maximum shrinkage stress was measured in the longitudinal direction and the lateral direction. Sample width: 10 mm, chuck distance: 3
0 mm <Perforation forming property> The forming property of perforation 2 by a blade for forming perforation was evaluated. ◯: Can be formed without problems. X: The film may be torn or the hole may not be formed. <Cleaving property> The self-cutting property in perforation 2 at the time of heat shrinkage was evaluated. ◯: Separated at each perforation 2. X: The packaging body 61 is connected without being separated. <Heat sealability> The state of the seal portion after dropping the package from a height of 1.5 m was evaluated. ○: There is no bag breakage at the seal part. ×: There is a bag breakage at the seal part. <Heat resistance> It was visually judged whether the film was whitened due to melting during heating. ◯: No whitening. ×: There is whitening. <Finishing of sleeve surface> The finished state of the sleeve surface after packaging was visually evaluated. ◯: Good x: Wrinkles and curls on the sleeve surface. <Bundling power> The bundling state of the packaged items after packaging was evaluated. ○: Good. Δ: Small looseness. X: Large looseness.
【００２３】製造例１ プロピレン−エチレン共重合体（プロピレン含量９５ｗ
ｔ％、ＭＩ＝１．２）を両表面層に、エチレン−ブテン
−１共重合体（密度０．９０５ｇ／ｃｍ3、ＭＩ＝０．
５）とプロピレン−ブテン共重合体（プロピレン含量７
８ｗｔ％、ＭＩ＝３．０）との組成物（ブレンド比＝
２：８）を芯層になるように厚み構成比１．０：１．
５：１．０の３層構成で溶融押出して原反フィルムを得
た。得られた、原反フィルムを表１の延伸条件で延伸し
て熱収縮性フィルムＡ、Ｂ、Ｃを得た。これらのフィル
ムの表面層のプロピレン含量は９５ｗｔ％、全体のプロ
ピレン含量は８１ｗｔ％であり、機械的、物理的性質は
表１に示した通りである。Production Example 1 Propylene-ethylene copolymer (propylene content 95 w
t%, MI = 1.2) on both surface layers, ethylene-butene-1 copolymer (density 0.905 g / cm 3 , MI = 0.
5) and a propylene-butene copolymer (propylene content 7
8 wt%, MI = 3.0) composition (blend ratio =
2: 8) to form the core layer, and the thickness composition ratio is 1.0: 1.
A raw film was obtained by melt-extruding in a three-layer structure of 5: 1.0. The obtained raw fabric film was stretched under the stretching conditions shown in Table 1 to obtain heat-shrinkable films A, B and C. The propylene content of the surface layer of these films was 95 wt%, the total propylene content was 81 wt%, and the mechanical and physical properties are as shown in Table 1.
【００２４】[0024]
【表１】 引張強度、伸び、１２０℃収縮率、１２０℃収縮応力は
それぞれ縦／横の形式で表した。[Table 1] The tensile strength, elongation, 120 ° C. shrinkage, and 120 ° C. shrinkage stress are expressed in the vertical / horizontal format, respectively.
【００２５】製造例２ プロピレン−エチレン共重合体（プロピレン含量９５ｗ
ｔ％、ＭＩ＝１．２）とプロピレン−ブテン共重合体
（プロピレン含量７８ｗｔ％、ＭＩ＝３．０）との組成
物（ブレンド比＝５：５）を両表面層に、エチレン−ブ
テン−１共重合体（密度０．９０５ｇ／ｃｍ3、ＭＩ＝
０．５）とプロピレン−ブテン共重合体（同上）のブレ
ンド物（ブレンド比＝２：８）を芯層になるように厚み
構成比１：１：１の３層構成で溶融押出して原反フィル
ムを得た。得られた。原反フィルムを９５℃で縦方向に
３倍、ついで１２０℃で横方向に７倍延伸して厚み２５
μの熱収縮性フィルムＤを得た。この熱収縮性フィルム
の表面層のプロピレン含量は８７ｗｔ％、全体のプロピ
レン含量は７８％で、引張強度は縦方向が７１０ｋｇ／
ｃｍ2、横方向が１６７３ｋｇ／ｃｍ2であり、伸びはそ
れぞれ２２３％、３１％、１２０℃収縮率はそれぞれ４
１％、６３％、１２０℃での収縮応力は８．３ｋｇ／ｃ
ｍ2、５５．７ｋｇ／ｃｍ2であった。Production Example 2 Propylene-ethylene copolymer (propylene content 95 w
t%, MI = 1.2) and a propylene-butene copolymer (propylene content 78 wt%, MI = 3.0) (blend ratio = 5: 5) on both surface layers, ethylene-butene- 1 copolymer (density 0.905 g / cm 3 , MI =
0.5) and a propylene-butene copolymer (same as above) blended (blend ratio = 2: 8) are melt-extruded to form a core layer in a three-layer structure with a thickness composition ratio of 1: 1: 1. I got a film. Was obtained. The original film is stretched 3 times in the machine direction at 95 ° C and then 7 times in the transverse direction at 120 ° C to obtain a thickness of 25
A heat shrinkable film D of μ was obtained. The propylene content of the surface layer of this heat-shrinkable film was 87 wt%, the total propylene content was 78%, and the tensile strength was 710 kg / longitudinal direction.
cm 2 , transverse direction is 1673 kg / cm 2 , elongation is 223%, 31%, 120 ° C. shrinkage is 4 respectively.
Shrinkage stress at 1%, 63%, 120 ° C is 8.3kg / c
It was m 2 and 55.7 kg / cm 2 .
【００２６】製造例３ プロピレン−ブテン共重合体（プロピレン含量７８％、
ＭＩ＝３．０）を溶融押出して原反フィルムを得た。次
いで、原反フィルムを９５℃で縦方向に２倍延伸し、続
いて１１５℃で横方向に９倍延伸して厚み２５μの熱収
縮性フィルムＥを得た。この熱収縮性フィルムは表面
層、及び全体のプロピレン含量＝７８ｗｔ％、引張強度
は縦方向６４０ｋｇ／ｃｍ2、横方向２４１５ｋｇ／ｃ
ｍ2であり、伸びは縦方向４４０％、横方向４２％、１
２０℃収縮率は縦方向３１％、横方向６４％であった。Production Example 3 Propylene-butene copolymer (propylene content 78%,
MI = 3.0) was melt-extruded to obtain a raw film. Next, the raw film was stretched twice in the machine direction at 95 ° C. and then stretched 9 times in the transverse direction at 115 ° C. to obtain a heat-shrinkable film E having a thickness of 25 μm. This heat-shrinkable film has a surface layer and the total propylene content = 78 wt%, the tensile strength is 640 kg / cm 2 in the longitudinal direction and 2415 kg / c in the transverse direction.
m 2 and the elongation is 440% in the longitudinal direction, 42% in the lateral direction, 1
The 20 ° C. shrinkage was 31% in the vertical direction and 64% in the horizontal direction.
【００２７】実施例及び比較例 製造例１〜３で得られた熱収縮性フィルムＡ〜Ｅ、及び
従来からピロースリーブ包装に利用されているポリ塩化
ビニル製の収縮フィルム（ＰＶＣ）（厚み２５μ、引張
強度＝縦方向４２０ｋｇ／ｃｍ2、横方向１０２０ｋｇ
／ｃｍ2、伸び＝縦方向２８０％、横方向１３０％、１
２０℃収縮率＝縦方向１８％、横方向５７％）を用いて
単３乾電池を４個ずつ図２に示した工程で加熱炉の設定
温度２００℃でピロースリーブ包装を行った。結果を表
２に示す。Examples and Comparative Examples Heat-shrinkable films A to E obtained in Production Examples 1 to 3 and polyvinyl chloride shrink film (PVC) (thickness 25 μm, which has been conventionally used for pillow sleeve packaging). Tensile strength = longitudinal direction 420 kg / cm 2 , lateral direction 1020 kg
/ Cm 2 , elongation = 280% in lengthwise direction, 130% in widthwise direction, 1
Pillow sleeve packaging was performed at a preset temperature of the heating furnace of 200 ° C. in the process shown in FIG. 2 by using four AA dry batteries at a shrinkage rate of 20 ° C. = 18% in the longitudinal direction and 57% in the lateral direction. The results are shown in Table 2.
【００２８】[0028]
【表２】 [Table 2]
【００２９】[0029]
【発明の効果】本発明のポリオレフィン系熱収縮性多層
フィルムは、従来から使用されてきているポリ塩化ビニ
ル製の収縮フィルムと同等の性能を示し、しかも該ポリ
塩化ビニル製フィルムの欠点であったヒートシール性も
改善された優れた包装用フィルムである。そしてピロー
スリーブ包装において、本発明のポリオレフィン系の熱
収縮性多層フィルムを使用した場合、包装仕上がりがよ
く、商品のディスプレー効果の高いピロースリーブ包装
ができる。更に、パーフォレーションによる自己切断を
利用した包装機に対しても優れた機械適性を有している
ので缶、瓶、特に乾電池などの集積包装を高速で行うこ
とができ生産性も改善できる。EFFECT OF THE INVENTION The polyolefin heat shrinkable multilayer film of the present invention exhibits the same performance as a conventionally used shrink film made of polyvinyl chloride and is a drawback of the polyvinyl chloride film. It is an excellent packaging film with improved heat sealability. When the polyolefin heat-shrinkable multilayer film of the present invention is used in pillow sleeve packaging, the packaging finish is good, and the pillow sleeve packaging with a high product display effect can be achieved. Further, since it has excellent mechanical suitability for a packaging machine that uses self-cutting by perforation, it can perform integrated packaging of cans, bottles, especially dry batteries at high speed and can improve productivity.
【図１】本発明のポリオレフィン系熱収縮性多層フィル
ムの断面図。FIG. 1 is a cross-sectional view of a polyolefin heat-shrinkable multilayer film of the present invention.
【図２】本発明のピロースリーブ収縮包装方法の概略を
示す模式図である。FIG. 2 is a schematic view showing an outline of the pillow sleeve shrink wrapping method of the present invention.
【図３】本発明で得られる包装体の斜視図である。FIG. 3 is a perspective view of a package obtained by the present invention.
１ ・・・熱収縮性多層フィルム １１・・・表面層 １２・・・芯層 ２ ・・・パーフォレーション ３ ・・・シール部 ４ ・・・スリーブ面 ５１・・・パーフォレーター（ミシン目加工機） ５２・・・シール機 ５３・・・加熱炉 ６０・・・被包装物 ６１・・・本発明の包装方法で得られる包装体 1 ... Heat-shrinkable multilayer film 11 ... Surface layer 12 ... Core layer 2 ... Perforation 3 ... Seal part 4 ... Sleeve surface 51 ... Perforator (perforation machine) ) 52 ... Sealing machine 53 ... Heating furnace 60 ... Packaged object 61 ... Package obtained by the packaging method of the present invention
Claims (5)
がプロピレン含量８５〜９６ｗｔ％のポリプロピレン系
樹脂からなり、該芯層がポリプロピレン系樹脂とポリエ
チレン系樹脂との樹脂組成物からなり、全構成樹脂中の
プロピレン含量が７０〜８５ｗｔ％であって、１２０℃
における縦方向の収縮率が２５〜４５％、横方向の収縮
率が縦方向の収縮率の１．２〜３．５倍であることを特
徴とするポリオレフィン系熱収縮性多層フィルム。1. A core layer and both surface layers, wherein the surface layer is made of a polypropylene resin having a propylene content of 85 to 96 wt%, and the core layer is made of a resin composition of a polypropylene resin and a polyethylene resin. , The propylene content in all constituent resins is 70 to 85 wt%, and the temperature is 120 ° C.
The shrinkage rate in the machine direction in 25 to 45%, and the shrinkage rate in the transverse direction are 1.2 to 3.5 times the shrinkage rate in the machine direction.
ルムに、長さ方向の一定間隔毎に、該フィルムの幅方向
に断続する切り離し用パーフォレーションを設けたこと
を特徴とする請求項１記載のポリオレフィン系熱収縮性
多層フィルム。2. The polyolefin-based heat-shrinkable multilayer film according to claim 1, wherein the polyolefin-based heat-shrinkable multi-layer film is provided with perforations for separation which are intermittent in the width direction of the film at regular intervals. Heat shrinkable multilayer film.
性多層フィルムを用い、被包装物を筒状に覆い、加熱す
ることにより該フィルムを収縮させることを特徴とする
ピロースリーブ収縮包装方法。3. A pillow sleeve shrink wrapping method, which comprises using the polyolefin-based heat-shrinkable multilayer film according to claim 1 to cover an object to be packed in a tubular shape and heating the film to shrink the film.
けたポリオレフィン系熱収縮性多層フィルムを用い、被
包装物を筒状に覆い、加熱することにより該フィルムを
収縮させ、同時に熱と該フィルムの収縮応力を利用し
て、該パーフォレーション部で自己切断させることを特
徴とするピロースリーブ収縮包装方法。4. A polyolefin-based heat-shrinkable multilayer film provided with the perforation according to claim 2, which covers a packaged object in a tubular shape and shrinks the film by heating, and at the same time, heat and shrinkage of the film. A pillow sleeve shrink wrapping method, wherein stress is used to self-cut at the perforation portion.
ことを特徴とする請求項３又は４記載のピロースリーブ
収縮包装方法。5. The pillow sleeve shrink wrapping method according to claim 3, wherein the article to be wrapped is an integrated body of dry batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04163839A JP3093449B2 (en) | 1992-05-29 | 1992-05-29 | Polyolefin-based heat-shrinkable multilayer film and shrink-wrapping method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04163839A JP3093449B2 (en) | 1992-05-29 | 1992-05-29 | Polyolefin-based heat-shrinkable multilayer film and shrink-wrapping method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05329995A true JPH05329995A (en) | 1993-12-14 |
| JP3093449B2 JP3093449B2 (en) | 2000-10-03 |
Family
ID=15781734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04163839A Expired - Lifetime JP3093449B2 (en) | 1992-05-29 | 1992-05-29 | Polyolefin-based heat-shrinkable multilayer film and shrink-wrapping method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093449B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001341250A (en) * | 2000-06-01 | 2001-12-11 | Okura Ind Co Ltd | Low temperature high shrinkable shrinkage label film |
| JP2014172335A (en) * | 2013-03-12 | 2014-09-22 | Mitsubishi Plastics Inc | Heat-shrinkable laminate film, molding and heat-shrinkable label using the film and container using the molding or provided with the label |
-
1992
- 1992-05-29 JP JP04163839A patent/JP3093449B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001341250A (en) * | 2000-06-01 | 2001-12-11 | Okura Ind Co Ltd | Low temperature high shrinkable shrinkage label film |
| JP2014172335A (en) * | 2013-03-12 | 2014-09-22 | Mitsubishi Plastics Inc | Heat-shrinkable laminate film, molding and heat-shrinkable label using the film and container using the molding or provided with the label |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3093449B2 (en) | 2000-10-03 |
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