JPH04270641A - Preparation of thermoplastic resin film - Google Patents

Preparation of thermoplastic resin film

Info

Publication number
JPH04270641A
JPH04270641A JP5311491A JP5311491A JPH04270641A JP H04270641 A JPH04270641 A JP H04270641A JP 5311491 A JP5311491 A JP 5311491A JP 5311491 A JP5311491 A JP 5311491A JP H04270641 A JPH04270641 A JP H04270641A
Authority
JP
Japan
Prior art keywords
film
hot air
air blowing
blowing means
thermoplastic resin
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
Application number
JP5311491A
Other languages
Japanese (ja)
Inventor
Seizo Aoki
青木 精三
Kenji Tsunashima
研二 綱島
Yukichi Deguchi
出口 雄吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP5311491A priority Critical patent/JPH04270641A/en
Publication of JPH04270641A publication Critical patent/JPH04270641A/en
Pending legal-status Critical Current

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  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To obtain a film excellent in thermal dimensional stability and flatness by applying reheating treatment even to a film wherein the characteristics of a biaxially stretched film subjected to reheating treatment are not specific without generating wrinkles. CONSTITUTION:In a process subjecting a heat-treated biaxially stretched film composed of a thermoplastic resin to reheating treatment, the film introduced into a reheating treatment process is allowed to glide along the arc surface of a hot air blowoff means having an arc longitudial cross section so as to draw an arc and subjected to slackening treatment during the gliding and led out at the final hot air blowoff position in the film gilding direction of the hot air blowoff means in the direction inside the tangential direction of the arc surface of the hot air blowoff means.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、熱による寸法変化が少
なく、かつ平面性に優れた熱可塑性樹脂フイルムの製造
方法に関する。さらに詳しくは包装材料、工業材料、電
気絶縁材料、コンデンサー材料、磁気材料などで熱寸法
安定性、平面性を必要とする用途に使用される熱可塑性
樹脂フイルムおよびシートの製造方法に関する。(本発
明で用いるフイルムとは、ことわりのないかぎりシート
も含むものである。)
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thermoplastic resin film that exhibits little dimensional change due to heat and excellent flatness. More specifically, the present invention relates to a method for producing thermoplastic resin films and sheets used in packaging materials, industrial materials, electrical insulation materials, capacitor materials, magnetic materials, etc., which require thermal dimensional stability and flatness. (The film used in the present invention also includes sheets, unless otherwise specified.)

【0002】0002

【従来の技術】熱寸法安定性を付与する手段として、特
開平2−22038号公報に、特定のフイルム特性を持
ったフイルムを、該フイルムの片面側から加熱空気を送
って曲面を描くように浮遊走行させ弛緩熱処理を行なう
方法が提案されている。
[Prior Art] As a means of imparting thermal dimensional stability, Japanese Patent Laid-Open No. 2-22038 discloses a method in which a film having specific film characteristics is formed into a curved surface by blowing heated air from one side of the film. A method has been proposed in which the material is floated and subjected to relaxation heat treatment.

【0003】0003

【発明が解決しようとする課題】しかしながら、上記従
来の熱寸法安定性を得るための方法には、次のような問
題が存在し、実用化には問題がある。まず、浮遊弛緩処
理を行なう前のフイルム特性を特定条件下に設定しなけ
ればならず、そのフイルム特性をもったものでなければ
十分な熱寸法安定性を得ることができない。また、平面
性を兼ね備えた状態で熱寸法安定性を満足することにつ
いても同様で、特定条件のフイルムを準備しなければ良
好な平面性が得られない。とくにフイルムを曲面を描く
ように浮遊走行させる際、走行方向に延びるシワが発生
し、該シワがフイルムの平面性を悪化させる。
However, the above-mentioned conventional method for obtaining thermal dimensional stability has the following problems, and there are problems in putting it into practical use. First, the characteristics of the film before the floating relaxation treatment must be set under specific conditions, and unless the film has those characteristics, sufficient thermal dimensional stability cannot be obtained. The same goes for satisfying thermal dimensional stability while also having flatness, and good flatness cannot be obtained unless a film under specific conditions is prepared. In particular, when the film is floated along a curved surface, wrinkles are generated that extend in the running direction, and these wrinkles deteriorate the flatness of the film.

【0004】本発明は、熱処理前の二軸延伸フイルム特
性が特定条件のフイルムでなくても、平面性が優れかつ
熱寸法安定性に優れた熱可塑性樹脂フイルムの製造方法
を提供することを目的とする。
An object of the present invention is to provide a method for producing a thermoplastic resin film that has excellent flatness and thermal dimensional stability even if the biaxially stretched film characteristics before heat treatment do not meet specific conditions. shall be.

【0005】[0005]

【課題を解決するための手段】この目的に沿う本発明の
熱可塑性樹脂フイルムの製造方法は、熱可塑性樹脂から
なる二軸延伸フイルムを熱処理した後、再熱処理する工
程において、該再熱処理工程に導入されたフイルムを、
弧状縦断面を有する熱風吹出し手段の弧状面に沿って弧
状を描くように浮上走行させ、該浮上走行中にフイルム
長手方向の弛緩処理を行ない、前記熱風吹出し手段のフ
イルム走行方向最終熱風吹出し位置において、熱風吹出
し手段の弧状面の接線方向よりも内側の方向にフイルム
を導出する方法から成る。
[Means for Solving the Problems] The method for producing a thermoplastic resin film of the present invention in accordance with this object includes a step of heat-treating a biaxially stretched film made of a thermoplastic resin and then reheating the film. The introduced film,
The hot air blowing means having an arcuate longitudinal cross section is floated in an arc shape along the arcuate surface, the film is loosened in the longitudinal direction during the floating run, and the hot air blowing means is at the final hot air blowing position in the film running direction. , a method in which the film is guided inward from the tangential direction of the arcuate surface of the hot air blowing means.

【0006】本発明における熱可塑性樹脂とは、加熱す
ると塑性を示す樹脂であり、代表的な樹脂としては、ポ
リエチレンテレフタレート、ポリエチレンナフタレート
など及びそれらの共重合体で代表されるように主鎖にエ
ステル結合を有するポリエステル類、ポリプロピレン、
ポリスチレンなどで代表されるポリオレフィン類、ナイ
ロン6、ナイロン66、ナイロン610、ナイロン12
などで代表されるポリアミド類、ポリフェニレンスルフ
ィドなど、およびそれらの共重合体や変成体などである
。本発明の場合、ポリエチレンテレフタレート、ポリエ
チレンナフタレート、ポリプロピレン、ポリフェニレン
スルフィドおよびそれらの共重合体などが特に本発明の
効果が顕著であり、好ましい。もちろん、上記ポリマー
に公知の添加剤、例えば安定剤、粘度調製剤、酸化防止
剤、充填剤、滑り剤、帯電防止剤、ブロッキング防止剤
、剥離剤、離型剤などを含有させてもよい。
[0006] The thermoplastic resin in the present invention is a resin that exhibits plasticity when heated, and typical resins include polyethylene terephthalate, polyethylene naphthalate, etc., and copolymers thereof. Polyesters with ester bonds, polypropylene,
Polyolefins represented by polystyrene, nylon 6, nylon 66, nylon 610, nylon 12
These include polyamides, such as polyphenylene sulfide, and copolymers and modified products thereof. In the case of the present invention, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyphenylene sulfide, and copolymers thereof are particularly preferred because the effects of the present invention are remarkable. Of course, the above polymer may contain known additives such as stabilizers, viscosity modifiers, antioxidants, fillers, slip agents, antistatic agents, antiblocking agents, release agents, mold release agents, and the like.

【0007】本発明における二軸延伸フイルムとは、長
手方向に延伸された後幅方向に延伸する逐次二軸延伸や
長手、幅方向がほぼ同時に延伸される同時二軸延伸され
たものなどを指し、その延伸方法は特に限定されるもの
ではない。
[0007] The biaxially stretched film in the present invention refers to a film subjected to sequential biaxial stretching in which the film is stretched in the longitudinal direction and then stretched in the width direction, or a film subjected to simultaneous biaxial stretching in which the longitudinal direction and the width direction are stretched almost simultaneously. However, the stretching method is not particularly limited.

【0008】また、本発明における熱処理も、特に限定
されるものではなく、公知の熱処理方法でよい。たとえ
ば二軸延伸終了後そのフイルムの(融点−5)℃〜(融
点−70)℃程度の温度で1〜30秒程度の緊張、長手
および/または幅方向に弛緩熱処理を行なうことを言う
。(以下二軸延伸フイルムと呼ぶ場合は、ことわりのな
いかぎりこれらの熱処理がされているものを言う)。
Further, the heat treatment in the present invention is not particularly limited, and any known heat treatment method may be used. For example, after the biaxial stretching is completed, the film is subjected to tensioning and relaxing heat treatment in the longitudinal and/or width directions at a temperature of about (melting point -5)°C to (melting point -70)°C for about 1 to 30 seconds. (Hereinafter, when we refer to a biaxially stretched film, we refer to a film that has undergone these heat treatments unless otherwise specified).

【0009】本発明における再熱処理とは、上記の二軸
延伸フイルムを再度熱処理する工程を言い、とくに本発
明ではフイルム長手方向の弛緩処理を行なう。この再熱
処理により、得られるフイルムの熱寸法安定性、より具
体的には熱収縮率が一層向上する。
[0009] The reheat treatment in the present invention refers to a step of heat-treating the above-mentioned biaxially stretched film again, and in particular, in the present invention, a relaxation treatment in the longitudinal direction of the film is performed. This reheat treatment further improves the thermal dimensional stability of the resulting film, more specifically the thermal shrinkage rate.

【0010】本発明方法では、上記再熱処理を、弧状を
描きながら熱風により浮上走行させることが必要である
。弧状に浮上走行させることによりフイルムに自由度を
もたせつつフイルムをふくらませるようにしてフイルム
にシワが入りにくいようにすることができる。また、浮
上走行により擦り傷などの表面欠点も防止される。さら
に弧状の長さを調節することにより十分な再熱処理時間
をとることも可能である。
[0010] In the method of the present invention, it is necessary to carry out the above-mentioned reheating treatment by floating the object in an arcuate manner using hot air. By floating the film in an arc shape, it is possible to give the film a degree of freedom and to inflate the film, thereby making it difficult for wrinkles to form in the film. In addition, surface defects such as scratches are also prevented by floating. Further, by adjusting the length of the arc, it is possible to provide sufficient reheating time.

【0011】しかし、単に弧状に浮上走行させるだけで
は、前述の如くフイルム長手方向に延びるシワの発生を
確実に防止することは困難で、このシワが発生するとフ
イルムの平面性が大きく損なわれる。
However, it is difficult to reliably prevent the formation of wrinkles extending in the longitudinal direction of the film as described above simply by floating the film in an arc shape, and when such wrinkles occur, the flatness of the film is greatly impaired.

【0012】本発明方法においては、再熱処理工程に導
入されたフイルムは弧状縦断面を有する熱風吹出し手段
の弧状面に沿って弧状を描くように浮上走行され、該浮
上走行中にフイルム長手方向の弛緩処理が行なわれるが
、とくに、熱風吹出し手段のフイルム走行方向最終熱風
吹出し位置において、熱風吹出し手段の弧状面の接線方
向よりも内側の方向にフイルムが導出される。このよう
にフイルム導出方向を規制することにより、熱風吹出し
手段から吹き出された熱風の圧力が、とくに出口近傍に
おいて適切にかつ均一に封じ込められ、処理中のフイル
ムに幅方向伸長力が均一に作用してフイルムにシワが入
ることが極めて効果的に防止される。そして、熱風吹出
し手段出口部でシワが入らないため、上流側弧面上でも
シワは発生しない。シワの全く発生していない状態のま
ま、再熱処理が行われ、かつ終了するので処理後のフイ
ルムの平面性は極めて良好になる。
In the method of the present invention, the film introduced into the reheating step is floated in an arc shape along the arcuate surface of the hot air blowing means having an arcuate longitudinal cross section, and during the float run, the film is moved in the longitudinal direction. During the relaxation process, the film is guided inward from the tangential direction of the arcuate surface of the hot air blowing means at the final hot air blowing position of the hot air blowing means in the film running direction. By regulating the direction in which the film is drawn out in this way, the pressure of the hot air blown out from the hot air blowing means is appropriately and uniformly contained, especially in the vicinity of the outlet, and the stretching force in the width direction acts uniformly on the film being processed. This effectively prevents wrinkles from forming on the film. Since wrinkles do not form at the outlet of the hot air blowing means, wrinkles do not occur even on the upstream arc surface. Since the reheat treatment is performed and completed in a state where no wrinkles are generated, the flatness of the film after treatment is extremely good.

【0013】上記シワの発生の有無については、熱風吹
出し手段の最終熱風吹出し位置におけるフイルム導出方
向を、熱風吹出し手段の弧状面の接線方向よりも内側に
規制するか否かによって、極めて顕著な差が生じる。つ
まり接線方向よりも内側に規制することにより、完全に
シワの発生が防止される。
[0013] Regarding the occurrence of wrinkles, there is a very noticeable difference depending on whether or not the direction in which the film is led out at the final hot air blowing position of the hot air blowing means is restricted to be inside the tangential direction of the arcuate surface of the hot air blowing means. occurs. In other words, by restricting it inward from the tangential direction, wrinkles can be completely prevented from forming.

【0014】上記再熱処理工程およびフイルムの導出は
、例えば図1ないし図3に示すように行われる。図1、
図2において、未延伸のフイルム1は、長手方向延伸工
程2で長手方向に延伸され、テンター3の予熱ゾーン4
で予熱、延伸ゾーン5で幅方向に延伸、熱処理ゾーン6
で熱固定或いは必要に応じて幅方向に弛緩処理され、二
軸延伸熱可塑性フイルム7として成形される。この二軸
延伸熱可塑性フイルム7が、テンター出口部に設けた再
熱処理手段8によって再熱処理され、長手方向に弛緩処
理される。ガイドロール9から再熱処理工程に導入され
たフイルム7は、図3に示すように、複数の熱風吹出し
ノズル10を有し弧状縦断面を有する熱風吹出し手段1
1の弧状面に沿って弧状を描くように浮上走行され、浮
上走行中に長手方向に弛緩処理される。そして、フイル
ム走行方向最終熱風吹出し位置(最終熱風吹出しノズル
10aの位置)において、熱風吹出し手段11の弧状面
の接線方向12よりも内側の方向13にフイルムが導出
される。図では角度θだけ内側に向けられている。導出
されたフイルムは、冷却手段、たとえば冷却ロール14
を経た後、再熱処理フイルム15として巻取工程等へ送
られる。再熱処理工程は、オーブン16で覆われ、熱風
は循環されながら所定の温度に加熱コントロールされる
。このように、出口におけるフイルム導出方向13を、
接線方向12よりも内側にすることにより、シワの発生
が完全に防止され、再熱処理により熱寸法安定性が確保
されつつ(低熱収縮率に保たれつつ)、平面性の極めて
良好なフイルムが得られる。
[0014] The above-mentioned reheat treatment step and film derivation are performed, for example, as shown in FIGS. 1 to 3. Figure 1,
In FIG. 2, the unstretched film 1 is stretched in the longitudinal direction in a longitudinal stretching step 2, and the film 1 is stretched in the preheating zone 4 of the tenter 3.
Preheating in Stretching Zone 5, stretching in the width direction in Stretching Zone 5, Heat Treatment Zone 6
The film is heat-set or, if necessary, relaxed in the width direction, and then formed into a biaxially stretched thermoplastic film 7. This biaxially stretched thermoplastic film 7 is reheated by a reheating means 8 provided at the outlet of the tenter, and subjected to a relaxation treatment in the longitudinal direction. As shown in FIG. 3, the film 7 introduced into the reheating process from the guide roll 9 is transferred to a hot air blowing means 1 having a plurality of hot air blowing nozzles 10 and having an arcuate longitudinal section.
It is floated in an arc shape along the arc-shaped surface of No. 1, and is subjected to a relaxation treatment in the longitudinal direction during the floatation run. Then, at the final hot air blowing position in the film running direction (the position of the final hot air blowing nozzle 10a), the film is drawn out in a direction 13 inside the tangential direction 12 of the arcuate surface of the hot air blowing means 11. In the figure, it is directed inward by an angle θ. The drawn-out film is cooled by a cooling means, for example, a cooling roll 14.
After passing through, the film is sent to a winding process etc. as a reheat-treated film 15. In the reheating process, the oven 16 is used to control heating to a predetermined temperature while circulating hot air. In this way, the film leading direction 13 at the exit is
By placing the film on the inside of the tangential direction 12, the generation of wrinkles is completely prevented, and the thermal dimensional stability is ensured by reheating (maintaining a low heat shrinkage rate), while a film with extremely good flatness can be obtained. It will be done.

【0015】上記弧状の浮上走行においては、弧状の半
径が250〜1000mmであるのがシワ防止の点で好
ましい。半径250mm未満ではシワが起こりやすくな
りかつ蛇行を起こしやすくなる。また、半径が1000
mmを越えてもシワが起こりやすくなるとともに装置が
大型化し好ましくない。
[0015] In the above-mentioned arc-shaped floating run, it is preferable that the radius of the arc is 250 to 1000 mm from the viewpoint of preventing wrinkles. If the radius is less than 250 mm, wrinkles are likely to occur and meandering is likely to occur. Also, the radius is 1000
If it exceeds mm, wrinkles tend to occur and the device becomes larger, which is not preferable.

【0016】この弧状の巻き付け角度は、120°以上
、好ましくは150°以上、より好ましくは180°以
上であるのが望ましい。弧状の半径にもよるが、120
°未満の巻き付け角度ではシワが発生しやすくなり、フ
イルムの蛇行も生じやすくなる。
[0016] The arcuate winding angle is desirably 120° or more, preferably 150° or more, and more preferably 180° or more. Depending on the radius of the arc, 120
If the winding angle is less than 0.0 degrees, wrinkles will easily occur, and the film will also tend to meander.

【0017】またこの弧状の再熱処理工程は、図4に示
すように連続して2個以上の熱風吹出し手段11a、1
1bを有していてもよく、その場合、逆方向に弧状を描
くように走行させるのがシワを防止して平面性を良好に
保つ観点から好ましい。
In addition, this arc-shaped reheating process is performed by consecutively using two or more hot air blowing means 11a, 1 as shown in FIG.
1b, and in that case, it is preferable to run in an arc shape in the opposite direction from the viewpoint of preventing wrinkles and maintaining good flatness.

【0018】この弧状の再熱処理は、図に示したように
弧状の内部から熱風を吹き出す構造をとり、フイルム幅
方向に延びるスリット等からなる熱風吹出しノズルを持
った構造で、円周方向に複数のノズルを持ったものであ
る必要がある。この弧状の再熱処理工程における吹出し
熱風の風速は、5〜200m/秒が良く、5m/秒未満
では処理効果が低下し、フイルムの蛇行の原因となる。 また200m/秒を越えるものではフイルムがばたつき
を生じ、擦り傷の原因となる。
This arc-shaped reheating process has a structure in which hot air is blown from the inside of the arc, as shown in the figure, and has a hot-air blowing nozzle consisting of a slit or the like extending in the film width direction. It must have a nozzle. The speed of the hot air blown out in this arcuate reheating process is preferably 5 to 200 m/sec, and if it is less than 5 m/sec, the processing effect will be reduced and the film will meander. Moreover, if the speed exceeds 200 m/sec, the film will flap, causing scratches.

【0019】またこの弧状を描く再熱処理工程では、フ
イルムの端部から1〜20mm外側にフイルムの浮上量
〜浮上量−10mm程度のじゃま板を設けるのが良い。 このじゃま板がないと、フイルムの蛇行が生じやすくな
ると共にフイルム端部が緊張した状態になり、フイルム
中央部がたるみを生じやすくなる。
Further, in this arcuate reheating step, it is preferable to provide a baffle plate 1 to 20 mm outward from the edge of the film with a distance of about 10 mm from the flying height of the film to the flying height of the film. Without this baffle plate, the film tends to meander, the edges of the film become tense, and the center of the film tends to sag.

【0020】再熱処理の温度条件としては、前述の熱処
理温度未満〜二次移転温度を越える温度領域で処理する
のが好ましい。熱寸法安定性を必要とする温度(±20
℃程度)で処理すれば良い。
As for the temperature conditions for the reheat treatment, it is preferable to carry out the treatment in a temperature range from below the above-mentioned heat treatment temperature to above the secondary transfer temperature. Temperatures requiring thermal dimensional stability (±20
℃)

【0021】処理時間としては使用する熱可塑性樹脂の
種類にもよるが、0.1〜30秒、好ましくは1〜20
秒が良い。0.1秒未満では処理効果が不十分となり目
標とする熱寸法安定性が得られない。また30秒を越え
るものでは、物性は満足するが装置が大型化し好ましく
ない。
The treatment time depends on the type of thermoplastic resin used, but is 0.1 to 30 seconds, preferably 1 to 20 seconds.
Seconds are good. If it is less than 0.1 seconds, the treatment effect will be insufficient and the target thermal dimensional stability will not be achieved. On the other hand, if the heating time exceeds 30 seconds, the physical properties may be satisfied, but the apparatus will become larger, which is not preferable.

【0022】またこの再熱処理は、長手方向の弛緩を行
なう必要があり、再熱処理前のフイルムの特性により変
化するが、その弛緩率としては15%以下、好ましくは
8%以下であるのが良い。
[0022] Further, this reheat treatment requires relaxation in the longitudinal direction, and although this varies depending on the characteristics of the film before the reheat treatment, the relaxation rate is preferably 15% or less, preferably 8% or less. .

【0023】また再熱処理工程の熱風吹出しは、弧状の
内側から前述した風速で吹き出す以外に、フイルムの逆
面側(外側)からも吹き出すことが、カールなどの防止
の観点から好ましい。この際風速は内側>外側でなけれ
ばならない。外側の風速が同じか大きい時はフイルムに
シワが入ったり、擦り傷が入るなどの問題を生じる。
In addition to blowing hot air from the inside of the arc at the above-mentioned speed, it is preferable to blow hot air from the opposite side (outside) of the film in the reheating step to prevent curling. In this case, the wind speed must be inside > outside. When the wind speed on the outside is the same or higher, problems such as wrinkles and scratches occur on the film.

【0024】さらに、幅方向延伸、熱処理から再熱処理
に至る工程における温度は、Tg(ガラス転移点)以下
であってもよいが、100〜180℃に保つことにより
、一層平面性、寸法安定性に優れたものとなり好ましい
Furthermore, the temperature in the steps from width direction stretching and heat treatment to reheat treatment may be below Tg (glass transition point), but by keeping it at 100 to 180°C, flatness and dimensional stability can be improved. It is preferable because it has excellent properties.

【0025】本発明方法では、上記再熱処理に続く冷却
も重要である。冷却工程が前記弧状の接線上かまたはそ
の内側に位置するようにし、および/または逆方向に弧
状を描きながら(例えば図4における熱風吹出し手段1
1bを冷風吹出し手段として用いて)、再熱処理温度か
ら40℃以下に下げることが望ましい。この条件をはず
れるとフイルムにシワが生じやすくなったり、それによ
って平面性を悪化させたりするなどの問題を生じるおそ
れがある。
[0025] In the method of the present invention, cooling subsequent to the reheat treatment is also important. The cooling process is located on or inside the tangent of the arc, and/or while tracing an arc in the opposite direction (e.g. hot air blowing means 1 in FIG. 4).
1b as a cold air blowing means), it is desirable to lower the reheat treatment temperature to 40° C. or lower. If this condition is not met, there is a risk that the film will be prone to wrinkles, which may cause problems such as deterioration of flatness.

【0026】また、この際の冷却時間としては、好まし
くは1分以下、より好ましくは30秒以下、さらに好ま
しくは0.001〜20秒が良い。冷却時間は早過ぎて
も遅過ぎても平面性の悪化やシワの発生につながる。こ
のため、冷却ロール14や弧状の冷却装置は、その取り
付け位置により前述の冷却時間を満足するように温度を
制御するのが好ましい。
The cooling time at this time is preferably 1 minute or less, more preferably 30 seconds or less, and even more preferably 0.001 to 20 seconds. Cooling time that is too early or too slow will lead to deterioration of flatness and generation of wrinkles. For this reason, it is preferable to control the temperature of the cooling roll 14 or the arc-shaped cooling device so as to satisfy the above-mentioned cooling time depending on the mounting position thereof.

【0027】次に本発明の製造方法の好ましい条件の一
つを説明するが、これに限定されるものではない。ポリ
エチレンテレフタレートを押出機に供給し、常法により
溶融させ、Tダイ口金より吐出させ、冷却ドラム上に静
電荷で密着固化させる。このフイルムを50〜130℃
で長手方向に2〜6.5倍延伸し、80〜160℃で幅
方向に3〜5倍延伸後、180〜240℃で熱処理をす
る。この際必要により幅方向及び長手方向に弛緩を行っ
ても良い。この延伸は一例であり、2段縦延伸をした後
、横延伸したものや、二軸延伸した後再縦延伸したもの
などであっても良い。上記の間に、特に長手方向の多段
延伸を行ない本手法と組み合わせると、一段と熱寸法安
定性に優れたものが得られる。次に、上記二軸延伸フイ
ルムを引続き弧状を描くように巻き付け角が120°〜
270°で浮上走行させ、弧状の内部から吹き出す熱風
の温度を60〜200℃にし、長手方向に10%以下の
弛緩をしながら再熱処理を行う。この再熱処理の温度か
ら40℃まで冷却する時間を0.1〜20秒になるよう
および弧状を描く接線より内側にフイルムが走行するよ
う冷却ロールを配置し、冷却後、巻取る。
Next, one of the preferable conditions for the manufacturing method of the present invention will be explained, but the conditions are not limited thereto. Polyethylene terephthalate is supplied to an extruder, melted by a conventional method, discharged from a T-die nozzle, and solidified by electrostatic charge onto a cooling drum. This film is heated to 50 to 130℃.
After stretching 2 to 6.5 times in the longitudinal direction at 80 to 160°C and 3 to 5 times in the width direction, heat treatment is performed at 180 to 240°C. At this time, relaxation may be performed in the width direction and the longitudinal direction if necessary. This stretching is just one example, and it may be two-stage longitudinal stretching and then transverse stretching, or biaxial stretching and then longitudinal stretching again. If multi-stage stretching, particularly in the longitudinal direction, is performed during the above steps and combined with this method, a product with even better thermal dimensional stability can be obtained. Next, the biaxially stretched film is continuously wrapped in an arc shape at an angle of 120° to
It is floated at 270 degrees, the temperature of the hot air blown out from the arc-shaped interior is set to 60 to 200 degrees Celsius, and the reheating treatment is performed while relaxing 10% or less in the longitudinal direction. A cooling roll is arranged so that the cooling time from the reheating temperature to 40° C. is 0.1 to 20 seconds and the film runs inward from the tangent to the arc, and after cooling, it is wound up.

【0028】[0028]

【発明の効果】本発明の熱可塑性樹脂フイルムの製造方
法によれば、再熱処理工程でシワを全く発生させること
なくフイルムの長手方向弛緩処理を行うことができるの
で、熱寸法安定性に優れ、かつ平面性が極めて優れた二
軸延伸熱可塑性樹脂フイルムが得られる。さらには、目
標とする再熱処理条件を、容易にかつ安定した状態で設
定でき、望ましい再熱処理により表面オリゴマー量も大
幅に低下したものが得られる。
Effects of the Invention According to the method for producing a thermoplastic resin film of the present invention, the film can be relaxed in the longitudinal direction without causing any wrinkles in the reheating process, so it has excellent thermal dimensional stability. Moreover, a biaxially stretched thermoplastic resin film with extremely excellent flatness can be obtained. Furthermore, target reheat treatment conditions can be easily and stably set, and desired reheat treatment can result in a material with a significantly reduced amount of surface oligomers.

【0029】[0029]

【評価方法】(1)平面性 フイルム全幅を3mサンプリングし、一端をフラットな
軸に貼付け2.5mの間隔をおいて、平面性のある自由
回転ロール上を介してこのロールに沿わせたのち、フイ
ルム端部に50g/mm2 の荷重が全幅均一にかかる
ようにフイルムをセットする。このフイルム長手方向の
中央部、すなわち1.25mの位置に全幅にわたり、水
平に糸を張る。この糸が、フイルム上の少なくとも1ヶ
所に接触するようにセットする。この時、平面性の悪い
フイルムはこの糸より離れたところにあり、この距離を
読み取り以下の評価基準により示した。平面性が全く問
題ない場合は、全幅にわたり、この糸に接触しているこ
とになる。 評価基準(最も離れた部分で評価) ○:フイルム〜糸間が2mm未満 △:フイルム〜糸間が2mm以上で10mm未満×:フ
イルム〜糸間が10mm以上 フイルム〜糸間が2mm未満では、使用上全く問題がな
いので○印で示した。10mm以上ではフイルムとして
全く使用不能であり×印で示した。2mm以上、10m
m未満は平面性の悪いのは認められるが、使用法によっ
て使えるものであり、△印で示した。
[Evaluation method] (1) Sample the entire width of a flat film of 3 m, attach one end to a flat shaft, and run it along a flat, free-rotating roll at an interval of 2.5 m. The film was set so that a load of 50 g/mm2 was applied uniformly across the entire width of the film. A thread is stretched horizontally across the entire width of the film at the center in the longitudinal direction, that is, at a position of 1.25 m. This thread is set so that it contacts at least one location on the film. At this time, the film with poor flatness was located at a distance from this thread, and this distance was read and indicated using the following evaluation criteria. If there is no problem with flatness, the entire width will be in contact with this thread. Evaluation criteria (evaluated at the farthest part) ○: Film-to-thread distance is less than 2 mm △: Film-to-thread distance is 2 mm or more and less than 10 mm ×: Film-to-thread distance is 10 mm or more and film-to-thread distance is less than 2 mm, cannot be used There is no problem at all, so I marked it with an ○. If it is 10 mm or more, it is completely unusable as a film and is indicated by an x mark. 2mm or more, 10m
It is recognized that the flatness is poor when the thickness is less than m, but it can be used depending on the usage, and is indicated by a △ mark.

【0030】(2)熱寸法安定性 熱収縮率で評価した。評価は材料や用途により必要温度
が異なるため、その都度表示した。その他の評価法は以
下の通りである。フイルムを幅10mm、長さ300m
mにサンプリングし、長手方向中央に200mm間隔で
マークを入れる。このサンプルに荷重3gをかけ、測定
しようとする温度、処理時間で処理し、その後前述のマ
ーク位置の間隔(L)を読み取り次式により求める。 熱収縮率(%)=(200−L)/200×100
(2) Thermal dimensional stability Evaluated by thermal shrinkage rate. Since the required temperature differs depending on the material and application, the evaluation is shown each time. Other evaluation methods are as follows. Film width 10mm, length 300m
m, and marks are placed in the center in the longitudinal direction at intervals of 200 mm. A load of 3 g is applied to this sample, the sample is processed at the temperature and processing time to be measured, and then the interval (L) between the mark positions described above is read and determined by the following equation. Heat shrinkage rate (%) = (200-L)/200x100

【0
031】(3)表面オリゴマー量 フイルムをエタノール中に浸し、超音波処理にて90秒
で洗浄し、この液を濃縮後、アセトニトリルを加えて高
速液体クロマトグラフィー(HPLC)にて分析した。
0
(3) Amount of surface oligomer The film was immersed in ethanol and washed with ultrasonic treatment for 90 seconds. After concentrating this liquid, acetonitrile was added and analyzed by high performance liquid chromatography (HPLC).

【0032】[0032]

【実施例】以下に本発明を実施例に基づき説明する。 実施例1〜3 実施例においては、ポリエチレンテレフタレート(〔η
〕=0.6)を押出機に供給し、290℃で溶融させ、
Tダイ口金より吐出させた後、表面温度30℃の冷却ド
ラム上に静電荷で密着固化させた。このフイルムを90
℃でロール周速差により長手方向に4.5倍延伸し、続
いてテンターにて90℃、2000%/分の延伸速度で
幅方向に4.0倍延伸後、定長下で、200℃で5秒間
熱処理した。この二軸延伸フイルムを、図1に示した装
置を用いて、引続き弧状を描くように巻き付け角が27
0°となるように浮上走行させ、弧状の内部から吹き出
す熱風の温度を150℃にして、長手方向に5%の弛緩
をしながら再熱処理を行なった。自然冷却も考慮して上
記再熱処理の温度から40℃まで冷却する時間を3秒に
なるよう冷却後、巻き取った。実施例2〜3においては
、実施例1に比べ、本発明範囲内で各種条件を変更した
。表1に結果を示すように、本発明の再熱処理方法によ
り、熱収縮率、平面性、さらには表面オリゴマー量に優
れた二軸延伸ポリエステルフイルムが得られた。
EXAMPLES The present invention will be explained below based on examples. Examples 1 to 3 In the examples, polyethylene terephthalate ([η
] = 0.6) was fed to the extruder and melted at 290°C,
After being discharged from a T-die nozzle, it was adhered and solidified by electrostatic charge onto a cooling drum whose surface temperature was 30°C. 90% of this film
The film was stretched 4.5 times in the longitudinal direction at 90°C by the difference in circumferential speed of the rolls, then 4.0 times in the width direction at 90°C in a tenter at a stretching rate of 2000%/min, and then stretched at 200°C at a constant length. The sample was heat-treated for 5 seconds. Using the apparatus shown in FIG.
The specimen was floated at 0°, the temperature of the hot air blown out from the arc-shaped interior was set to 150°C, and reheat treatment was performed while relaxing the specimen by 5% in the longitudinal direction. Taking natural cooling into consideration, the film was cooled so that the cooling time from the temperature of the reheat treatment to 40° C. was 3 seconds, and then the film was wound up. In Examples 2 and 3, compared to Example 1, various conditions were changed within the scope of the present invention. As shown in Table 1, by the reheat treatment method of the present invention, a biaxially stretched polyester film excellent in heat shrinkage rate, flatness, and surface oligomer content was obtained.

【0033】比較例1〜3 上記実施例において、再熱処理工程におけるフイルムの
導出角度を、熱風吹出し手段の弧状の接線方向に対し外
側となるように設定したところ、フイルムに多数の波状
シワが発生し、平面性が不良となった。また、再熱処理
が安定しないため目標とする熱収縮率が得にくく、また
そのバラツキも大きかった。また比較例3においては、
再熱処理を行わなかったところ、熱収縮率が低下しない
とともに、表面オリゴマー量が多くなった。
Comparative Examples 1 to 3 In the above examples, when the angle at which the film was taken out in the reheating process was set to be on the outside with respect to the tangential direction of the arc of the hot air blowing means, many wavy wrinkles were generated on the film. However, the flatness was poor. Furthermore, because the reheat treatment was not stable, it was difficult to obtain the target heat shrinkage rate, and the variation was large. In addition, in Comparative Example 3,
When reheat treatment was not performed, the heat shrinkage rate did not decrease and the amount of surface oligomers increased.

【0034】[0034]

【表1】[Table 1]

【図面の簡単な説明】[Brief explanation of the drawing]

【図1】本発明方法に係るフイルム製造工程の概略側面
図である。
FIG. 1 is a schematic side view of a film manufacturing process according to the method of the present invention.

【図2】第1図の製造工程の平面図である。FIG. 2 is a plan view of the manufacturing process shown in FIG. 1;

【図3】第1図の製造工程における再熱処理工程の拡大
縦断面図である。
3 is an enlarged vertical cross-sectional view of a reheat treatment step in the manufacturing process of FIG. 1. FIG.

【図4】第3図の工程の変形例を示す概略側面図である
FIG. 4 is a schematic side view showing a modification of the process shown in FIG. 3;

【符号の説明】[Explanation of symbols]

2  長手方向延伸工程 3  テンター 5  幅方向延伸ゾーン 7  二軸延伸フイルム 8  再熱処理工程 10  熱風吹出しノズル 11,11a,11b  熱風吹出し手段12  接線
方向 13  接線よりも内側の方向 14  冷却ロール 15  再熱処理フイルム
2 Longitudinal stretching process 3 Tenter 5 Width direction stretching zone 7 Biaxially stretched film 8 Reheating process 10 Hot air blowing nozzles 11, 11a, 11b Hot air blowing means 12 Tangential direction 13 Direction inside the tangent 14 Cooling roll 15 Reheating film

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】  熱可塑性樹脂からなる二軸延伸フイル
ムを熱処理した後、再熱処理する工程において、該再熱
処理工程に導入されたフイルムを、弧状縦断面を有する
熱風吹出し手段の弧状面に沿って弧状を描くように浮上
走行させ、該浮上走行中にフイルム長手方向の弛緩処理
を行ない、前記熱風吹出し手段のフイルム走行方向最終
熱風吹出し位置において、熱風吹出し手段の弧状面の接
線方向よりも内側の方向にフイルムを導出することを特
徴とする熱可塑性樹脂フイルムの製造方法。
[Claim 1] In the step of heat treating a biaxially stretched film made of a thermoplastic resin and then reheating the film, the film introduced into the reheating step is passed along an arcuate surface of a hot air blowing means having an arcuate longitudinal section. The film is levitated in an arc shape, and during the levitated run, the film is loosened in the longitudinal direction, and at the final hot air blowing position of the hot air blowing means in the film running direction, the hot air blowing means is placed inside the tangential direction of the arcuate surface of the hot air blowing means. 1. A method for producing a thermoplastic resin film, characterized in that the film is produced in a direction.
【請求項2】  前記浮上走行による弛緩処理に続く工
程がフイルム冷却工程である請求項1の熱可塑性樹脂フ
イルムの製造方法。
2. The method for producing a thermoplastic resin film according to claim 1, wherein the step following the relaxation treatment by floating is a film cooling step.
【請求項3】  前記熱風吹出し手段のフイルム走行方
向下流に、さらに、逆転した弧状縦断面を有する別の熱
風吹出し手段が設けられ、前記熱風吹出し手段から前記
別の熱風吹出し手段にかけてフイルムを連続的に浮上走
行させる請求項1の熱可塑性樹脂フイルムの製造方法。
3. Another hot air blowing means having an inverted arcuate longitudinal section is further provided downstream of the hot air blowing means in the film traveling direction, and the film is continuously passed from the hot air blowing means to the other hot air blowing means. 2. The method for producing a thermoplastic resin film according to claim 1, wherein the thermoplastic resin film is carried out while floating.
JP5311491A 1991-02-26 1991-02-26 Preparation of thermoplastic resin film Pending JPH04270641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5311491A JPH04270641A (en) 1991-02-26 1991-02-26 Preparation of thermoplastic resin film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5311491A JPH04270641A (en) 1991-02-26 1991-02-26 Preparation of thermoplastic resin film

Publications (1)

Publication Number Publication Date
JPH04270641A true JPH04270641A (en) 1992-09-28

Family

ID=12933775

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5311491A Pending JPH04270641A (en) 1991-02-26 1991-02-26 Preparation of thermoplastic resin film

Country Status (1)

Country Link
JP (1) JPH04270641A (en)

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