JP2826885B2 - Method for producing biaxially stretched polyester film - Google Patents
Method for producing biaxially stretched polyester filmInfo
- Publication number
- JP2826885B2 JP2826885B2 JP9291690A JP9291690A JP2826885B2 JP 2826885 B2 JP2826885 B2 JP 2826885B2 JP 9291690 A JP9291690 A JP 9291690A JP 9291690 A JP9291690 A JP 9291690A JP 2826885 B2 JP2826885 B2 JP 2826885B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- stretching
- biaxially stretched
- polyester film
- stretched polyester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は二軸延伸ポリエステルフイルムの製造方法、
特に、横方向に延伸したフイルムの両端部をトリミング
した後の縦方向延伸時および再横延伸時に発生するフイ
ルムの破断を防止し、安定に二軸延伸ポリエステルフイ
ルムを製造する方法に関するものであり、更に縦方向及
び横方向に強度の高い二軸延伸ポリエステルフイルムを
安定に製造する方法に関するものである。The present invention relates to a method for producing a biaxially stretched polyester film,
In particular, the present invention relates to a method for producing a biaxially stretched polyester film by preventing breakage of a film generated at the time of longitudinal stretching after trimming both end portions of the film stretched in the horizontal direction and at the time of re-transverse stretching, and stably producing a biaxially stretched polyester film. Further, the present invention relates to a method for stably producing a biaxially stretched polyester film having high strength in the longitudinal and transverse directions.
従来、縦及び横方向の二軸共に強度の高い二軸延伸ポ
リエステルフイルムを製造する方法としてポリエステル
フイルムを二軸延伸し、横方向のＦ−５値に対する縦方
向のＦ−５値の比が、1.70〜3.70で、且つ、横方向のＦ
−５値が少なくとも8.0kg/mm2である縦方向強化二軸延
伸フイルムとなし、次いで、150〜220℃で、1.2倍以上
再横延伸する方法がついて知られている（特開昭51−11
5571号）。Conventionally, a polyester film is biaxially stretched as a method for producing a biaxially stretched polyester film having high strength in both the longitudinal and transverse directions, and the ratio of the F-5 value in the longitudinal direction to the F-5 value in the transverse direction is as follows: 1.70 to 3.70 and horizontal F
A method is known in which a biaxially stretched film having a -5 value of at least 8.0 kg / mm 2 is formed in a longitudinally reinforced biaxially stretched film. 11
No. 5571).
しかし、上述の如き方法では再横延伸時に破断が発生
するという問題点があり、再横延伸温度範囲が狭く、ま
た再横延伸倍率が低かった。そのために、両軸共に強度
を高めるには限界があった。However, the method as described above has a problem that a break occurs at the time of re-lateral stretching, and the re-lateral stretching temperature range is narrow and the re-lateral stretching ratio is low. Therefore, there is a limit in increasing the strength of both axes.
本発明はかかる課題を解消せしめ、安定に両軸共に強
度の高い二軸延伸フイルムを製造することを目的とする
ものである。An object of the present invention is to solve such a problem and to stably produce a biaxially stretched film having high strength in both axes.
本発明は二軸延伸ポリエステルフイルムを製造するに
おいて、先ず横方向に延伸し、次いで両端部をトリミン
グした後、縦方向に延伸し、再度横延伸を行う方法にお
いて、フイルム両端部から各々10mm以上で横延伸後のフ
イルムの中央部の厚みより大きい位置でトリミングを行
うことを特徴とする二軸延伸ポリエステルフイルムの製
造方法に関するものである。In the method of producing a biaxially stretched polyester film, the film is first stretched in the horizontal direction, then trimmed at both ends, stretched in the vertical direction, and then horizontally stretched again. The present invention relates to a method for producing a biaxially stretched polyester film, wherein trimming is performed at a position larger than the thickness of the central portion of the film after the transverse stretching.
本発明におけるポリエステルはエチレンテレフタレー
ト、エチレンα，β−ビス（２−クロルフェノキシ）エ
タン−4,4′−ジカルボキシレート、エチレン2,6−ナフ
タレート単位などからなり、代表的にはポリエチレンテ
レフタレートである。二軸延伸後に適度の易滑性を付与
するために、滑剤として公知の内部粒子を添加する処方
を行うこと、あるいは延伸が完了するまでの段階で表面
に易滑性などを付与するためのコーティングを行うこ
と、あるいは放電加工処理など必要に応じて行うことが
できる。また、熱安定性を向上させるために熱固定処理
および弛緩処理を再横延伸の前後で行うことが出来る。The polyester in the present invention comprises ethylene terephthalate, ethylene α, β-bis (2-chlorophenoxy) ethane-4,4′-dicarboxylate, ethylene 2,6-naphthalate units, and is typically polyethylene terephthalate. . In order to impart appropriate lubricity after biaxial stretching, a formulation for adding known internal particles as a lubricant is performed, or a coating for imparting lubricity to the surface until the stretching is completed Or electric discharge machining as required. Further, in order to improve the thermal stability, the heat setting treatment and the relaxation treatment can be performed before and after the re-horizontal stretching.
更に本発明において、両端部をトリミングする際にフ
イルムの端部から10mm以上で横延伸後のフイルム中央部
より厚みの大きい位置でカットする理由は、10mm未満で
は横延伸時のクリップ把持部に発生した欠点によると考
えられるが、破断発生のために安定した縦方向高倍率延
伸を行うことが困難であるためであり、横延伸後のフイ
ルム中央部より厚みの大きい位置でカットする理由は、
横延伸倍率の低い位置でカットすることにより縦方向延
伸時の破断を防止することが出来るためであり、さら
に、再横延伸時に発生するクリップ把持部からの破断を
防止することが出来るためである。Further, in the present invention, when trimming both ends, the reason why the film is cut at a position which is 10 mm or more from the end of the film and which is thicker than the central portion of the film after the lateral stretching is generated at the clip gripping portion at the time of lateral stretching when the film is less than 10 mm. Although it is considered to be due to the drawback, it is difficult to perform stable high-magnification stretching in the longitudinal direction due to the occurrence of breakage, and the reason for cutting at a position thicker than the film central part after transverse stretching is
By cutting at a position where the transverse stretching ratio is low, it is possible to prevent breakage at the time of longitudinal stretching, and further, it is possible to prevent breakage from the clip gripping portion occurring at the time of re-transverse stretching. .
一般に溶融押し出ししたシートは端部の厚みが大きく
なるが、本発明において何ら影響は見られなかっただけ
でなく、この部分は横延伸後に未延伸のまま残り、この
位置でカットすることにより著しい縦延伸倍率の向上が
可能である。また、フイルムの両端部の厚みが大きいた
め、再横延伸においてクリップ把持部からの破断も防止
できる。再横延伸温度は100℃〜230℃であることが好ま
しい。さらに好ましくは120℃〜220℃である。In general, the melt-extruded sheet has a large thickness at the end, but not only has no effect in the present invention, but this portion remains unstretched after the transverse stretching, and by cutting at this position, a significant vertical length is obtained. It is possible to improve the draw ratio. In addition, since the thickness of both ends of the film is large, breakage from the clip gripping part in re-horizontal stretching can be prevented. The transverse stretching temperature is preferably from 100 ° C to 230 ° C. The temperature is more preferably from 120C to 220C.
本発明の方法によれば、薄物の製膜安定性が向上し、
破断による生産性の低下を防止することが可能である。According to the method of the present invention, the film formation stability of a thin material is improved,
It is possible to prevent a decrease in productivity due to breakage.
実施例１〜３、比較例１〜３ 溶融押し出ししたポリエチレンテレフタレート未延伸
フイルム（中央部の厚み123μｍ）を先ず横方向に95℃
で3.5倍延伸した。得られたフイルムの中央部の厚みは3
5μｍであった。次いでカット位置を変えてトリミング
を行った後、縦延伸し、更に再横延伸をおこなった。再
横延伸温度200℃、再横延伸倍率1.3倍とし、縦延伸を倍
率を変え、連続して1000mのフイルムを破断なく得られ
る倍率を安定最高延伸倍率とし測定し、その結果を表−
１に示した。Examples 1-3, Comparative Examples 1-3 A melt-extruded polyethylene terephthalate unstretched film (123 μm thick at the center) was first placed in a transverse direction at 95 ° C.
And stretched 3.5 times. The thickness of the center of the obtained film is 3
It was 5 μm. Next, after performing trimming while changing the cutting position, the film was longitudinally stretched, and then re-transversely stretched. The transverse stretching temperature was set to 200 ° C., the transverse stretching ratio was set to 1.3 times, the longitudinal stretching was changed, and the ratio at which a 1000 m film could be continuously obtained without breaking was measured as the highest stable stretching ratio.
1 is shown.
実施例４〜25 溶融押し出ししたポリエチレンテレフタレート未延伸
フイルム（中央部の厚み148μｍ）を先ず横方向に95℃
で3.5倍延伸した。得られたフイルムの中央部の厚みは4
2μｍであった。次いでフイルム端部から20mmの位置で
カットを行った後、縦方向に６倍延伸した。カット位置
のフイルム厚みは275μであった。得られたフイルムを
温度および倍率を変えて再横延伸した。その結果を表−
２に示した。 Examples 4 to 25 A melt-extruded polyethylene terephthalate unstretched film (148 μm in thickness at the center) was first placed in a transverse direction at 95 ° C.
And stretched 3.5 times. The thickness of the center of the obtained film is 4
It was 2 μm. Next, after cutting at a position 20 mm from the end of the film, the film was stretched 6 times in the machine direction. The film thickness at the cutting position was 275 μm. The obtained film was stretched again at different temperatures and magnifications. Table-
2 is shown.
（発明の効果） 本発明によればフイルム破断による生産性の低下は全
くなく、両軸に高強度なポリエステルフイルムを製造で
きることがわかる。 (Effects of the Invention) According to the present invention, there is no reduction in productivity due to film breakage, and it can be seen that a high-strength polyester film can be produced on both axes.
フロントページの続き (72)発明者 奥平 正 福井県敦賀市東洋町10番24号 東洋紡績 株式会社総合研究所敦賀分室内 審査官 綿谷 晶廣 (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 55/02 - 55/14Continuation of the front page (72) Inventor Tadashi Okuhira 10-24, Toyo-cho, Tsuruga-shi, Fukui Prefecture Toyobo Co., Ltd. General Researcher, Tsuruga Branch Room Examiner Akihiro Wataya (58) Field surveyed (Int.Cl. 6 , DB Name) B29C 55/02-55/14
Claims (1)
方法において、先ず横方向に延伸し、次いで両端部をト
リミングした後、縦方向に延伸し、再度横方向に延伸を
行う方法であって、縦延伸前にフイルム両端部から各々
10mm以上内側且つ横延伸後のフイルムの中央部の厚みよ
り大きい位置でトリミングを行うことを特徴とする二軸
延伸ポリエステルフイルムの製造方法。1. A method for producing a biaxially stretched polyester film, comprising first stretching in the horizontal direction, then trimming both end portions, stretching in the vertical direction, and stretching in the horizontal direction again. Before stretching the film
A method for producing a biaxially stretched polyester film, characterized in that trimming is performed at a position at least 10 mm inward and larger than the thickness of the central portion of the film after the transverse stretching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291690A JP2826885B2 (en) | 1990-04-06 | 1990-04-06 | Method for producing biaxially stretched polyester film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291690A JP2826885B2 (en) | 1990-04-06 | 1990-04-06 | Method for producing biaxially stretched polyester film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03290230A JPH03290230A (en) | 1991-12-19 |
| JP2826885B2 true JP2826885B2 (en) | 1998-11-18 |
Family
ID=14067811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9291690A Expired - Fee Related JP2826885B2 (en) | 1990-04-06 | 1990-04-06 | Method for producing biaxially stretched polyester film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2826885B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4542681B2 (en) * | 2000-08-09 | 2010-09-15 | 株式会社クラレ | Method for producing ethylene-vinyl alcohol copolymer resin film |
-
1990
- 1990-04-06 JP JP9291690A patent/JP2826885B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03290230A (en) | 1991-12-19 |
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