JPS6257453A - Polystyrene based heat shrinkable film - Google Patents
Polystyrene based heat shrinkable filmInfo
- Publication number
- JPS6257453A JPS6257453A JP19576285A JP19576285A JPS6257453A JP S6257453 A JPS6257453 A JP S6257453A JP 19576285 A JP19576285 A JP 19576285A JP 19576285 A JP19576285 A JP 19576285A JP S6257453 A JPS6257453 A JP S6257453A
- Authority
- JP
- Japan
- Prior art keywords
- film
- weight
- shrinkable film
- content
- heat
- 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.)
- Pending
Links
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はポリスチレン系の熱収縮フィルムに関する。更
に詳しくは、ガラス壜被覆材として使用される熱収縮フ
ィルムに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polystyrene heat-shrinkable film. More specifically, the present invention relates to a heat-shrinkable film used as a covering material for glass bottles.
従来、ガラス壜被覆材用の熱収縮フィルムとしては、耐
衝撃性に優れる塩化ビニルフィルムが主に使用されてき
たが、ゴミ焼却炉の壁面を傷めるという問題や衛生上の
問題から最近この代替物としてスチレンーブタジエンラ
°ロック共重合体(以下、ブロックSBRと略す)のフ
ィルムが開発されてきた(特開昭58−41050 )
。Conventionally, vinyl chloride film, which has excellent impact resistance, has been mainly used as a heat-shrinkable film for covering glass bottles, but due to the problem of damaging the walls of garbage incinerators and hygienic issues, this alternative has recently been used. A film of styrene-butadiene rubber lock copolymer (hereinafter abbreviated as block SBR) has been developed as
.
しかしながら、ブロックSBR単独の熱収縮フィルムは
ガラス壜に装着する際滑り抵抗が大きく、装着ロスが多
量に発生したり、更にこのフィルムの装着されたガラス
壜を充填ラインに流した際、殺菌の為に熱水中を通過さ
せる(パストロ)工程で壜同志が接触し、フィルムが粘
着して、パストロ工程を通過した後ガラス壜が横転した
りあるいはフィルムが損傷を受け、商品価値を低下させ
るばかりでなく、炭酸ガスを圧入したガラス壜が破損し
た時の破片の飛散抑止能力が減少し危険であるなど問題
がある。However, the heat-shrinkable film for block SBR alone has high slip resistance when attached to glass bottles, resulting in a large amount of attachment loss, and furthermore, when the glass bottles attached with this film are sent to the filling line, it is difficult to sterilize them. During the PASTRO process, the bottles come into contact with each other, causing the film to stick, causing the glass bottle to tip over after passing through the PASTRO process, or damaging the film, which only reduces the product value. However, when a glass bottle into which carbon dioxide gas is pressurized is broken, its ability to prevent fragments from scattering is reduced, making it dangerous.
本発明者らは、この様な状況下に装着する機械適性が良
(また熱水中での耐ブロッキング性にも優れ、しかも耐
衝撃性の良い熱収縮フィルムを鋭意検討した結果、ブロ
ックSBRと耐衝撃ポリスチレン(HIPS )を混合
して用いることが有効であることを見出し、本発明を完
成するに至った。As a result of intensive research into a heat-shrinkable film that has good mechanical suitability for mounting under such conditions (and has excellent blocking resistance in hot water and good impact resistance), the inventors have developed a block SBR. It was discovered that it is effective to use a mixture of high-impact polystyrene (HIPS), and the present invention was completed.
すなわち本発明はスチレン含有量70〜80重量%かつ
ブタジェン含有量20〜30重量%であるスチレン−ブ
タジエンブロック共重合体100重に延伸して得たフィ
ルムであって、120℃に加熱した際延伸方向の収縮率
が60〜85%であり、それと直角方向の収縮率が15
%以下であることを特徴とする熱収縮フィルムである。That is, the present invention is a film obtained by stretching 100 layers of a styrene-butadiene block copolymer having a styrene content of 70 to 80% by weight and a butadiene content of 20 to 30% by weight. The shrinkage rate in the direction is 60-85%, and the shrinkage rate in the perpendicular direction is 15%.
% or less.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
本発明で使用するブロックSBRとは
(S−B)n−8、(S−B)n 、、B−(S−B)
n(ここで、S;スチレンプロツ?、B;ブタジェンブ
ロック、n;2〜10の整数である。)の一般構造式を
有し、スチレン含有量70〜80重量%、ブタジェン含
有量30〜20重量%からなるものである。ブタジェン
含有量が30重量%を越えると成形したフィルムの剛性
が不足し、かつ、ガラス壜との滑り抵抗が大きくなり、
壜に装着する際ロスが多くなる。またブタジェン含有量
が20重量%未満ではフィルムの耐衝撃性が低下する為
、被覆壜が接触しながらライン上を流れるだけでもクラ
ックが入り易くなる。What is the block SBR used in the present invention? (S-B)n-8, (S-B)n, , B-(S-B)
It has a general structural formula of n (where S: styrene block, B: butadiene block, n: an integer of 2 to 10), styrene content 70 to 80% by weight, butadiene content 30 to 20%. % by weight. If the butadiene content exceeds 30% by weight, the rigidity of the molded film will be insufficient and the sliding resistance against the glass bottle will increase.
There is a lot of loss when attaching it to the bottle. Furthermore, if the butadiene content is less than 20% by weight, the impact resistance of the film will be lowered, so that even if the coated bottle is in contact with the film and flows along the line, cracks will easily occur.
本発明で用いるHIPSとは一般の耐衝撃ポリスチレン
であり、ゴム分が4〜10重景%全部る。HIPS used in the present invention is a general high-impact polystyrene, and has a rubber content of 4 to 10% by weight.
ゴム分が4重量%未満では耐衝撃強度が低下し被覆壜が
ライン上衝突した程度でフィルムにクラックが入る。1
0重量%以上ではフィルムの透明性が損われる。If the rubber content is less than 4% by weight, the impact strength will decrease and the film will crack if the coated bottle collides with it on the line. 1
If it exceeds 0% by weight, the transparency of the film will be impaired.
ブロックS B R100重量部に対するHI PSの
添加比は3〜10重量部である。HIPSの添加量が3
重量部未満では熱水中での耐ブロッキング性が劣る。ま
たHIPSが10重量部を越えると耐衝撃性が劣り、壜
同志がライン上で衝突しながら流れてもフィルム表面に
クラックが入り易(なったり、また透明性が低下してく
る。The addition ratio of HI PS to 100 parts by weight of block SBR is 3 to 10 parts by weight. Addition amount of HIPS is 3
If the amount is less than part by weight, blocking resistance in hot water will be poor. Furthermore, if HIPS exceeds 10 parts by weight, the impact resistance will be poor, and even if bottles collide with each other on the line and flow, cracks will easily form on the film surface, and the transparency will decrease.
本発明では、着色剤、帯防剤、各種安定剤等を添加する
ことは何ら差支えない。In the present invention, there is no problem in adding colorants, antistatic agents, various stabilizers, etc.
本発明の熱収縮フィルムを得る為の延伸処理は通常の一
軸延伸フィルムを製造する方法、例えばTダイより押出
したシートをロール延伸機で延伸処理を施す方法や、イ
ンフレ方式で得たフィルムを加熱しながらニップロール
の引取速度差を設けて延伸処理を施す方法等をそのまま
応用すれば良く、印刷、スリット等の後処理を考慮する
とフィルムの引取(縦)方向に延伸することが好ましい
。The stretching treatment for obtaining the heat-shrinkable film of the present invention can be carried out by a conventional method for producing a uniaxially stretched film, such as a method in which a sheet extruded from a T-die is stretched in a roll stretching machine, or a film obtained by an inflation method is heated. However, it is sufficient to apply the method of performing stretching treatment by setting a difference in the take-up speed of nip rolls as is, and in consideration of post-processing such as printing and slitting, it is preferable to stretch the film in the take-off (longitudinal) direction.
本発明における予熱条件は70〜120℃、好ましくは
85〜110℃の温度範囲で行うのが良く、延伸倍率は
3〜7倍、好ましくは4〜6倍が選択される。予熱温度
が70℃未満では延伸時に厚みムラを生じたり、フィル
ムが切断したりして均質なフィルムが得に(い。また1
20℃を越すと延伸効果が損われる。延伸倍率が3倍未
満ではフィルムを加熱した際収縮性が乏しく、ガラス壜
の肩部の密着性が悪くなる。また逆に7倍を越えると延
伸方向に裂は易く、印刷、スリット等の工程で支障をき
たす。Preheating conditions in the present invention are preferably in the temperature range of 70 to 120°C, preferably 85 to 110°C, and the stretching ratio is selected to be 3 to 7 times, preferably 4 to 6 times. If the preheating temperature is lower than 70°C, the thickness may become uneven during stretching or the film may be cut, making it difficult to obtain a homogeneous film.
If the temperature exceeds 20°C, the stretching effect will be impaired. If the stretching ratio is less than 3 times, the film will have poor shrinkage properties when heated and will have poor adhesion to the shoulder of the glass bottle. On the other hand, if it exceeds 7 times, it tends to tear in the stretching direction, causing problems in printing, slitting, and other processes.
本発明のフィルムの収縮率は、特に重要な物性であり、
120℃の油浴中、1分間浸漬後の変化量で測定され、
延伸方向で60〜85%、好ましくは70〜80%であ
り、それと直角方向で15%以下、好ましくは5%以下
である。延伸方向の収縮率が60%未満ではガラス壜の
肩部の密着性が劣る。また延伸方向と直角方向の収縮率
が15%を越えると、フィルムに印刷した図柄が変形し
、ラベルとしての商品価値が低下する。The shrinkage rate of the film of the present invention is a particularly important physical property,
Measured by the amount of change after 1 minute immersion in a 120°C oil bath,
It is 60 to 85%, preferably 70 to 80% in the stretching direction, and 15% or less, preferably 5% or less in the direction perpendicular to the stretching direction. If the shrinkage rate in the stretching direction is less than 60%, the adhesion of the shoulder of the glass bottle will be poor. Furthermore, if the shrinkage rate in the direction perpendicular to the stretching direction exceeds 15%, the design printed on the film will be deformed, reducing the commercial value of the label.
また引張弾性率は延伸方向で6,000 ky/cr1
以上、延伸方向と直角方向で5,000 kg/i以上
が必要である。延伸方向の引張弾性率が6,000 k
g/c+d未満では印刷、スリット及び装着工程等テン
ションをかげる工程で伸縮を起こし、均質なラベルが得
られない。また直角方向の引張弾性率がs、ooo k
g/d未満ではガラス壜に装着させる際フィルムが折れ
たりしてロスが多く発生する。In addition, the tensile modulus is 6,000 ky/cr1 in the stretching direction.
As mentioned above, 5,000 kg/i or more is required in the direction perpendicular to the stretching direction. Tensile modulus in stretching direction is 6,000 k
If it is less than g/c+d, it will expand and contract during processes that reduce tension, such as printing, slitting, and mounting processes, making it impossible to obtain a homogeneous label. Also, the tensile modulus in the perpendicular direction is s, ooo k
If it is less than g/d, the film may break when attached to a glass bottle, resulting in a lot of loss.
なお、フィルムの厚さとしては、特に制限はないが、通
常20〜300μmが適当であり、上記引張弾性率によ
り適宜決定される。The thickness of the film is not particularly limited, but is usually suitably 20 to 300 μm, and is appropriately determined based on the tensile modulus.
以下、実施例にて本発明を説明する。 The present invention will be explained below with reference to Examples.
実施例1〜4、比較例1〜7
表に示した樹脂を原料として5011φ押出機に取付け
た300n巾のTダイよりシートを押出し、このシート
を引取方向に5倍延伸して厚さ80μmの熱収縮フィル
ムを得た。Examples 1 to 4, Comparative Examples 1 to 7 Using the resins shown in the table as raw materials, a sheet was extruded from a 300n wide T-die attached to a 5011φ extruder, and this sheet was stretched 5 times in the drawing direction to form a sheet with a thickness of 80 μm. A heat-shrinkable film was obtained.
このフィルムの物性及び実用テストを実施した結果を表
に記載した。The physical properties of this film and the results of practical tests are listed in the table.
ここでフィルムの耐衝撃性は、被覆したガラス壜を10
+mの落差で胴部同志を衝突させたときにフィルム面に
傷が発生するか否かを目視で判断している。フィルム面
にクラックが発生することは、被覆したガラス壜を各ラ
インに流した際フィルムが損傷をうけることを意味する
。Here, the impact resistance of the film is 10
Visual judgment is made to determine whether or not scratches will occur on the film surface when the barrels collide with each other with a drop of +m. The occurrence of cracks on the film surface means that the film is damaged when the coated glass bottles are passed through the lines.
また、耐ブロッキング性は、3本の被覆壜を1kgの力
で締めて85℃の熱水中に20分間浸漬した後取り出し
外観を観察する。In addition, blocking resistance was determined by tightening three coated bottles with a force of 1 kg, immersing them in hot water at 85° C. for 20 minutes, and then taking them out and observing their appearance.
破壜時の破片飛散保持率とは、内容量315ccのガラ
ス壜(170P )に炭酸ガスを発生する処方液を30
0 cc充填し、液温25℃で内圧が4 kg、/+!
になる様に調整し、75αの高さよりガラス壜を横向き
にコンクリート上に落下して破裂させ、壜の破片が落下
点より半径1m以内に溜ったものの重量を測定し、その
重量を試料ガラス壜の重量で割ったものであり、60個
の平均を示す。なお、ガラス壜はフィルムによって、ガ
ラス壜重量の約90%の範囲が被覆された耐ブロツキン
グテスト前のものを使用し、飛散保持率が90%よりも
低いことはフィルムに覆われている部分の破片も飛散す
ることを表わし、逆に90%より大きな数値はフィルム
の飛散防止性能が優れていることを意味している。The fragment scattering retention rate when the bottle is broken means that 30% of the prescription liquid that generates carbon dioxide gas is placed in a glass bottle (170P) with an internal capacity of 315cc.
0 cc filled, liquid temperature 25℃, internal pressure 4 kg, /+!
Then drop the glass bottle horizontally onto the concrete from a height of 75α to cause it to explode. Measure the weight of the bottle fragments that have accumulated within a radius of 1 m from the point of fall, and add that weight to the sample glass bottle. It is divided by the weight of , and shows the average of 60 pieces. In addition, the glass bottle used was before the anti-blocking test, in which about 90% of the glass bottle weight was covered with a film, and if the scattering retention rate was lower than 90%, it was covered with the film. This indicates that fragments of the film are also scattered, and conversely, a value greater than 90% means that the film has excellent scattering prevention performance.
比較例−8
実施例2において延伸倍率を2倍にした他は実施例2と
同様にして得たフィルムを使用した。Comparative Example 8 A film obtained in the same manner as in Example 2 except that the stretching ratio was doubled was used.
結果を表に示した。The results are shown in the table.
本発明の熱収縮フィルムは、ガラス壜との滑り性が改良
され、高速で装着可能となり、また、充填ライン中でパ
ストロ工程を通過する際のフィルム同志の滑り性および
ブロッキング性が改善され、ガラス壜が横転によるライ
ン停止が激減し、フィルムの損傷もなく、ロスがなくな
った。また透明性、耐衝撃性にも優れており、内圧のか
かった炭酸飲料壜が破裂した場合でも、ガラス壜の口部
の下まで被覆することにより破片の飛散を防止する効果
もある。The heat-shrinkable film of the present invention has improved sliding properties with glass bottles and can be installed at high speed, and also has improved sliding properties and blocking properties between the films when passing through the PASTRO process in a filling line. Line stoppages due to bottles overturning have been drastically reduced, and there is no damage to the film, eliminating waste. It also has excellent transparency and impact resistance, and even if a carbonated beverage bottle ruptures under internal pressure, it can coat the bottom of the mouth of the glass bottle to prevent fragments from scattering.
Claims (1)
有量30〜20重量%であるスチレン−ブタジエンブロ
ック共重合体100重量部と、ゴム分が4〜10重量%
である耐衝撃性ポリスチレン3〜10重量部からなるシ
ートを一方方向に延伸して得たフィルムであって、12
0℃に加熱した際延伸方向の収縮率が60〜85%で、
それと直角方向の収縮率が15%以下であることを特徴
とする熱収縮フィルム。 2、延伸方向の引張弾性率が6,000kg/cm^2
以上であり、それと直角方向の引張弾性率が5,000
kg/cm^2以上である請求範囲第1項記載の熱収縮
フィルム。 3、延伸方向がフィルムの巻取り方向である請求範囲第
1項記載の熱収縮フィルム。[Scope of Claims] 1. 100 parts by weight of a styrene-butadiene block copolymer having a styrene content of 70 to 80% by weight and a butadiene content of 30 to 20% by weight, and a rubber content of 4 to 10% by weight.
A film obtained by stretching in one direction a sheet consisting of 3 to 10 parts by weight of impact-resistant polystyrene,
When heated to 0°C, the shrinkage rate in the stretching direction is 60 to 85%,
A heat-shrinkable film having a shrinkage rate of 15% or less in a direction perpendicular to the heat-shrinkable film. 2. Tensile modulus in the stretching direction is 6,000 kg/cm^2
or more, and the tensile modulus in the direction perpendicular to it is 5,000
The heat-shrinkable film according to claim 1, which has a heat shrinkable film of kg/cm^2 or more. 3. The heat-shrinkable film according to claim 1, wherein the stretching direction is the winding direction of the film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19576285A JPS6257453A (en) | 1985-09-06 | 1985-09-06 | Polystyrene based heat shrinkable film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19576285A JPS6257453A (en) | 1985-09-06 | 1985-09-06 | Polystyrene based heat shrinkable film |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6257453A true JPS6257453A (en) | 1987-03-13 |
Family
ID=16346534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19576285A Pending JPS6257453A (en) | 1985-09-06 | 1985-09-06 | Polystyrene based heat shrinkable film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6257453A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003016026A1 (en) * | 2001-08-17 | 2003-02-27 | Toyobo Co., Ltd. | Heat-shrinkable polystyrene based resin film roll and method for production thereof, and heat-shrinkable label |
-
1985
- 1985-09-06 JP JP19576285A patent/JPS6257453A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003016026A1 (en) * | 2001-08-17 | 2003-02-27 | Toyobo Co., Ltd. | Heat-shrinkable polystyrene based resin film roll and method for production thereof, and heat-shrinkable label |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1120227A (en) | Packaged article covered with special film | |
JP2705975B2 (en) | Transparent shrinkable film based on a mixture of polypropylene and a hydrocarbon resin, process for producing the same and shrinkable label made from the film | |
JPH0319840A (en) | Multilayer clear polyorefin film applied for shrik labeling | |
JPS5837155B2 (en) | sekisoukouzoubutsu | |
JPH03218812A (en) | Cold stretched material containing propylene resin composition and its manufacture | |
JP2010502770A5 (en) | ||
JP2010502770A (en) | Shrink label of oriented polystyrene film with small rubber particle and low rubber particle gel content and containing block copolymer | |
TWI409293B (en) | Heat-shrinkable polystyrene-based film and process for manufacturing it | |
AU621270B2 (en) | Slitting of plastic film | |
US20080286540A1 (en) | Multilayer Heat Shrinkable Polystyrene Film and Heat Shrinkable Label and Container Using the Film | |
JPH04275143A (en) | Biaxially stretching multilayer polyorefin film sealable at both its end, enhanced in shrinkability and improved in barrier characteristic | |
JPS6257453A (en) | Polystyrene based heat shrinkable film | |
JPH0582810B2 (en) | ||
JP2002003619A (en) | Polyolefin stretched film | |
JPH0546304B2 (en) | ||
JPH0254776B2 (en) | ||
JP2000135762A (en) | Film for stretch packing | |
WO2020026969A1 (en) | Block copolymer composition, heat shrink film using same, and package provided with heat shrink film | |
JPS5841050A (en) | Method of preventing breakdown and scattering of glass vessel | |
JPH11335500A (en) | Propylene-based resin composition and drawn film using the same | |
JPH0419928B2 (en) | ||
JP4106602B2 (en) | Heat-shrinkable polyolefin film | |
JPH02127041A (en) | Film for twist wrapping | |
JPH0124405B2 (en) | ||
JPS62148241A (en) | Shrinkable sleeve forming sheet |