JP2550225B2 - Method for producing thermoplastic resin film - Google Patents
Method for producing thermoplastic resin filmInfo
- Publication number
- JP2550225B2 JP2550225B2 JP4740791A JP4740791A JP2550225B2 JP 2550225 B2 JP2550225 B2 JP 2550225B2 JP 4740791 A JP4740791 A JP 4740791A JP 4740791 A JP4740791 A JP 4740791A JP 2550225 B2 JP2550225 B2 JP 2550225B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- tenter
- edge
- folded
- stretched
- 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
- Advancing Webs (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱可塑性樹脂フイルムの
製造方法に関し、更に詳しくはテンターを用いて熱可塑
性樹脂フイルムを少くとも横方向に延伸するに際し、テ
ンター内におけるフイルムの破断を減少せしめて薄い延
伸フイルムを安定して製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thermoplastic resin film, and more particularly, to reduce the breakage of the film in the tenter when the thermoplastic resin film is stretched at least in the transverse direction using a tenter. The present invention relates to a method for stably producing a thin stretched film.
【０００２】[0002]
【従来の技術】クリップテンターによりフイルムを延伸
する際に、極めて薄物ではフイルム端部近傍でのフイル
ム破断がしばしば発生し、この破断が操業性を著しく低
下させている。また、一部フイルム破断が発生すると破
れ屑の処分，設備の再点検などのため、製造停止のロス
時間が短い場合でも数分間、長い場合には数十分に及
び、しかもこの間ダイからの樹脂押し出しを継続するこ
とがあり、樹脂のロスにもなる。製造工程中の破断はフ
イルム厚さが薄くなるほど多くなる。2. Description of the Related Art When a film is stretched by a clip tenter, a very thin product often causes a film break near the edge of the film, and this break significantly deteriorates the operability. Also, if some film ruptures occur, the scraps will be disposed of and the equipment will be re-inspected. Therefore, even if the production stop time is short, it will be several minutes, and if it is long, it will be tens of minutes. Extrusion may continue, resulting in resin loss. The number of breaks during the manufacturing process increases as the film thickness decreases.
【０００３】薄い熱可塑性樹脂フイルムをテンターによ
り安定して製造する方法として、特公昭６３−９２４３
４号公報に示されているように、フイルムのクリップ把
持部の厚さを規定する方法や、特公昭６３−９４８１８
号公報に示されているように、複数の未延伸フイルムを
重ね合せて延伸する方法等が考案されている。As a method for stably producing a thin thermoplastic resin film by means of a tenter, Japanese Patent Publication No. 63-9243.
As disclosed in Japanese Patent Publication No. 4 (1994), a method of defining the thickness of the clip gripping portion of the film, and Japanese Patent Publication No. 63-94818.
As disclosed in Japanese Patent Laid-Open Publication No. 2004-242242, a method of stacking a plurality of unstretched films and stretching them has been devised.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、高強度
フイルムを得るため縦，横方向の逐次二軸延伸によって
得たフイルムを、更に縦，横方向に延伸する際、フイル
ムのクリップ把持部の厚さをコントロールするのは困難
であるし、二軸延伸工程中にフイルムの端部を切り落と
す工程がある場合には、フイルムのクリップ把持部の厚
さをコントロールできない。また、フイルムを重ね合わ
せて延伸する方法は、表裏の温度差に起因する物性の不
均一や延伸途中での剥離が懸念されるし、多大な設備投
資が必要である。However, when a film obtained by successive biaxial stretching in the longitudinal and transverse directions to obtain a high-strength film is further stretched in the longitudinal and transverse directions, the thickness of the clip gripping portion of the film is increased. Is difficult to control, and the thickness of the clip gripping portion of the film cannot be controlled when there is a step of cutting off the end portion of the film during the biaxial stretching step. Further, in the method of stretching the films by superposing them, there is a concern that the physical properties may be non-uniform due to the temperature difference between the front and back and peeling may occur during the stretching, and a large capital investment is required.
【０００５】本発明は、上記欠点を解決せしめ、薄い延
伸フイルム、特に高強度フイルムを安定して製造するこ
とを目的とするものである。An object of the present invention is to solve the above drawbacks and to stably produce a thin stretched film, particularly a high strength film.
【０００６】[0006]
【課題を解決するための手段】本発明は、かかる目的を
達成するために、次の構成からなる。The present invention has the following constitution in order to achieve the above object.
【０００７】少くとも横方向に延伸した熱可塑性樹脂フ
イルムをテンターにより製造するに際し、テンターに供
するフイルムの端部を長手方向に連続的に折り重ね、該
折り重ね部をテンタークリップで把持しながら少くとも
横方向に延伸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。When a thermoplastic resin film stretched at least in the transverse direction is produced by a tenter, the end portion of the film to be used for the tenter is continuously folded in the longitudinal direction, and the folded portion is gripped by a tenter clip to reduce the amount of the film. A method for producing a thermoplastic resin film, characterized in that both are stretched in the transverse direction.
【０００８】本発明における熱可塑性樹脂とは、フイル
ムが二軸延伸可能な特性を有する熱可塑性樹脂であれば
いずれであってもよい。その代表例としては、ポリエチ
レンテレフタレート，ポリブチレンフタレート，ポリエ
チレンナフタレンジカルボキシレート，高密度ポリエチ
レン，ポリプロピレン，ナイロン６，ナイロン６６等が
あげられる。The thermoplastic resin in the present invention means a film.
Beam may be any as long as it is a thermoplastic resin having a biaxially stretchable properties. Typical examples thereof include polyethylene terephthalate, polybutylene phthalate, polyethylene naphthalene dicarboxylate, high density polyethylene, polypropylene, nylon 6, nylon 66 and the like.
【０００９】本発明におけるテンターとは、クリップで
未延伸フイルム、あるいは縦一軸延伸フイルム、または
二軸延伸フイルムの両端部を把持して、縦横同時二軸延
伸あるいは横延伸するものである。In the present invention, the tenter is a clip which holds both ends of an unstretched film, a longitudinally uniaxially stretched film, or a biaxially stretched film, and performs simultaneous longitudinal and transverse biaxial stretching or transverse stretching.
【００１０】テンターで少くとも横方向に延伸するプロ
セス、すなわち横延伸または同時二軸延伸するプロセス
として、未延伸フイルムを横延伸または同時二軸延伸す
る方法、未延伸フイルムを縦または横に延伸した後、テ
ンターで横延伸または同時二軸延伸する方法、未延伸フ
イルムを縦及び横に延伸した後、テンターで横延伸また
は同時二軸延伸する方法、未延伸フイルムを縦及び横に
延伸した後、再度縦に延伸し、しかる後テンターで横延
伸する方法などがあげられる。本発明はあらゆるプロセ
スにおいて適用可能であるが、特に縦，横，再縦に延伸
されたフイルムを更に横延伸する場合に好適である。As a process of stretching at least in the transverse direction with a tenter, that is, as a process of transverse stretching or simultaneous biaxial stretching, a method of transversely stretching or simultaneous biaxially stretching an unstretched film, or stretching the unstretched film longitudinally or transversely Later, a method of transverse stretching or simultaneous biaxial stretching with a tenter, after stretching the unstretched film longitudinally and transversely, a method of stretching laterally or simultaneously biaxially with a tenter, after stretching the unstretched film longitudinally and transversely, Examples include a method in which the film is longitudinally stretched again and then transversely stretched with a tenter. The present invention can be applied to any process, but is particularly suitable for the case where a film which has been stretched in the machine direction, the transverse direction, and the longitudinal direction is further transversely stretched.
【００１１】本発明では、テンターに供するフイルムの
厚みは特に限定されるものではないが、従来の延伸方法
では破断が多い、薄いフイルムほど効果が大きい。さら
にテンターに供する前の中央部の厚みが２０μｍ以下の
フイルムが好ましく、特にこの厚みが５〜１５μｍのフ
イルムが最適である。In the present invention, the thickness of the film to be used for the tenter is not particularly limited, but the thinner the film is, the more effective it is in the conventional stretching method. Further, a film having a thickness of 20 μm or less in the central portion before being subjected to a tenter is preferable, and a film having a thickness of 5 to 15 μm is particularly suitable.
【００１２】本発明においてフイルム端部を長手方向
（縦方向）に連続的に折り重ねる形態は、テンターのク
リップ（把持具）が折り重ね部分を十分把持できる形態
であれば特に限定されない。この形態のいくつかの図面
を用いて説明すると、図１はエッジを折り重ねたフイル
ムをクリップが把持している状態を、フイルム走行方向
の上流から見た図であり、図１において１１はテンター
クリップ，１２はフイルム，１３はフイルム把持部，ｈ
はエッジ折り重ね幅である。図１に示すように、エッジ
を折り重ねた部分がフイルム把持部を含んでいる必要が
ある。図２はフイルムエッジの折り返し方を示した図で
あり、図２におけるａは上側に２重に折る方法、ｂは上
側に３重に折る方法、ｃは下側に２重に折る方法、ｄは
下側に３重に折る方法を示す。折ったフイルム端部は
ａ，ｂのように上側にあってもよいし、ｃ，ｄのように
下側にあってもよい。好ましくは、クリップの把持部の
鋭利な側に、折ったフイルム端部がくるのが良く、更に
好ましくはフイルム端部を３重以上に折り重ねるのが良
い。フイルムを折り重ねる幅は、クリップのフイルム把
持部をカバーすることが必要である事から、１０mm以上
必要である。好ましくは、フイルム幅変動によってもエ
ッジ折り返し部が、フイルム把持部を外れないように、
１５mm以上が良い。In the present invention, the form in which the end portions of the film are continuously folded in the longitudinal direction (longitudinal direction) is not particularly limited as long as the clip (holding tool) of the tenter can hold the folded portion sufficiently. Describing with reference to some drawings of this mode, FIG. 1 is a view of a state in which a clip holds a film having folded edges, as viewed from the upstream side in the film traveling direction. In FIG. 1, 11 is a tenter. Clip, 12 is a film, 13 is a film grip, h
Is the edge folding width. As shown in FIG. 1, the portion where the edges are folded must include the film grip portion. 2A and 2B are views showing how the film edge is folded back. In FIG. 2, a is a double folding method on the upper side, b is a triple folding method on the upper side, c is a double folding method on the lower side, and d is a double folding method. Shows a method of folding in three layers on the lower side. The folded film end may be on the upper side like a or b or on the lower side like c or d. It is preferable that the folded film end is on the sharp side of the grip portion of the clip, and more preferably the film end is folded in three or more layers. The width for folding the film must be 10 mm or more because it is necessary to cover the film gripping portion of the clip. Preferably, the edge turn-back portion does not come off the film gripping portion even when the film width changes,
15mm or more is good.
【００１３】本発明においてフイルム端部を長手方向
（縦方向）に連続的に折り重ねる方法として種々の方法
を用いることができる。例えば、図３は平板を折り曲げ
たエッジ折り具でフイルムエッジを折り返している状態
を示す図であり、図３においては３１は平板を折り曲げ
たエッジ折り具，３２はフイルムである。図４はＵ字型
の溝をもつ回転可能な円板によりフイルムエッジを折り
返している状態を示す図であり、図４において４１はエ
ッジ折り具（Ｕ字溝付円板），４２はフイルム，４３は
ベアリング，４４はエッジ折り具回転軸である。図５は
位置をずらして設置した２枚の平板によりフイルムエッ
ジを折り返している状態を示す図であり、図５において
５１はエッジ折り具ａ，５２はエッジ折り具ｂ，５３は
フイルムであり、エッジ折り具ａとエッジ折り具ｂの位
置をずらしてフイルムを３重折りにするようにしてい
る。図６は位置をずらして２枚の回転可能な円板により
フイルムエッジを折り返している状態を示す図であり、
図６において６１は回転円板のエッジ折り具ａ，６２は
回転円板のエッジ折り具ｂ，６３はフイルム，６４はエ
ッジ折り具ａの回転軸，６５はエッジ折り具ｂの回転軸
であり、エッジ折り具ａとエッジ折り具ｂの位置をずら
してフイルムを３重折りにするようにしている。図７は
折り曲った板の中に仕切板を設置したエッジ折り具によ
りフイルムエッジを徐々に折っている状況を示す図であ
り、図７において７１はエッジ折り曲げ具の折り曲げ
板，７２はエッジ折り曲げ具の仕切板，７３はフイル
ム，矢印はフイルムの走行方向である。また図３〜図７
に示すような手段を組合せて用いることもできる。そし
てエッジ折れ曲げ具の下流側に、折れ曲ったフイルム端
部が元に戻らないよう、折り目を加熱定着させると、よ
り安定したエッジ折り重ねが可能となるので好ましい。
この加熱手段には、小型の誘導加熱ロール，熱風ヒータ
ー，ＩＲヒーター，レーザー，超音波等のあらゆる方法
が適用できる。In the present invention, various methods can be used as a method of continuously folding the end portions of the film in the longitudinal direction (longitudinal direction). For example, FIG. 3 is a view showing a state in which a film edge is folded back by an edge fold tool obtained by folding a flat plate. In FIG. 3, 31 is an edge fold tool obtained by folding a flat plate, and 32 is a film. FIG. 4 is a view showing a state in which the film edge is folded back by a rotatable disc having a U-shaped groove. In FIG. 4, 41 is an edge folding tool (U-shaped grooved disc), 42 is a film, Reference numeral 43 is a bearing, and 44 is an edge folding tool rotating shaft. FIG. 5 is a view showing a state in which the film edges are folded back by two flat plates placed at different positions. In FIG. 5, 51 is an edge fold a, 52 is an edge fold b, and 53 is a film, The positions of the edge folding tool a and the edge folding tool b are shifted so that the film is folded in three layers. FIG. 6 is a view showing a state in which the film edge is folded back by two rotatable discs which are displaced from each other,
In FIG. 6, 61 is a rotary disk edge fold a, 62 is a rotary disk edge fold b, 63 is a film, 64 is a rotary axis of the edge fold a, and 65 is a rotary axis of the edge fold b. The positions of the edge folding tool a and the edge folding tool b are shifted so that the film is folded in three layers. FIG. 7 is a view showing a state in which a film edge is gradually folded by an edge folder in which a partition plate is installed in a bent plate. In FIG. 7, 71 is a fold plate of the edge fold tool, and 72 is an edge fold. The partition plate of the tool, 73 is the film, and the arrow is the traveling direction of the film. 3 to 7
It is also possible to use a combination of the means shown in. It is preferable to heat and fix the folds on the downstream side of the edge bending tool so that the bent film ends do not return to their original positions, because more stable edge folding is possible.
As the heating means, any method such as a small induction heating roll, a hot air heater, an IR heater, a laser and an ultrasonic wave can be applied.
【００１４】[0014]
【実施例】以下、実施例を掲げて本発明を更に説明す
る。EXAMPLES The present invention will be further described below with reference to examples.
【００１５】[0015]
【実施例１及び比較例１】固有粘度０．６５のポリエチ
レンテレフタレート樹脂を２８０℃で溶融し、口金より
４０℃の冷却ロール上に押し出し、直ちに冷却して未延
伸フイルムを得た。これをロールを用いて縦方向に８０
℃で２．０倍延伸し、次いでテンターにより横方向に１
００℃で３．０倍延伸し、更に１１０℃で熱固定し二軸
延伸フイルムを得た。この二軸延伸フイルムを再度縦方
向に１４０℃で４．０倍延伸し、テンターにより再度横
方向に１５０℃で１．６倍延伸し、厚み６μｍの二軸延
伸フイルムを得た（比較例１）。Example 1 and Comparative Example 1 A polyethylene terephthalate resin having an intrinsic viscosity of 0.65 was melted at 280 ° C., extruded from a die onto a cooling roll at 40 ° C. and immediately cooled to obtain an unstretched film. Use a roll to make 80
Stretched 2.0 times at ℃, then 1 in the transverse direction with a tenter
The film was stretched 3.0 times at 00 ° C and heat-set at 110 ° C to obtain a biaxially stretched film. This biaxially stretched film was again stretched 4.0 times in the longitudinal direction at 140 ° C. and again 1.6 times in the transverse direction at 150 ° C. by a tenter to obtain a biaxially stretched film having a thickness of 6 μm (Comparative Example 1). ).
【００１６】前記の再縦延伸後のフイルムに図６に示す
折れ曲げ手段を施し、さらに図４に示すような折れ曲げ
手段（但し、フイルム折れは３重である）を施してフイ
ルムのエッジを上側に３重に折り重ね、この折り重ね部
をステンタークリップに噛み込ませて、把持させて再横
延伸する以外は、比較例１と同様に行って二軸延伸フイ
ルムを得た（実施例１）。The film after the re-longitudinal stretching is subjected to the folding means shown in FIG. 6 and further subjected to the folding means shown in FIG. 4 (however, the film is folded three times) so that the edge of the film is removed. A biaxially stretched film was obtained in the same manner as in Comparative Example 1 except that it was folded in three upwards, and the folded portion was bitten by a stenter clip, gripped, and re-stretched laterally. 1).
【００１７】これらの製膜特性を表１に示す。Table 1 shows these film forming characteristics.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【実施例２及び比較例２】実施例１と同様な工程で得た
未延伸フイルムを、縦方向に９５℃で３．６倍延伸して
一軸延伸フイルムを得、テンターにより横方向に１２０
℃で４．０倍延伸し、厚み３μｍの二軸延伸フイルムを
得た（比較例２）。Example 2 and Comparative Example 2 An unstretched film obtained by the same process as in Example 1 was stretched 3.6 times at 95 ° C. in the machine direction to obtain a uniaxially stretched film, and a uniaxially stretched film was obtained by a tenter to obtain 120 in the cross direction.
The film was stretched 4.0 times at 0 ° C. to obtain a biaxially stretched film having a thickness of 3 μm (Comparative Example 2).
【００２０】前記の一軸延伸フイルムに図４に示すよう
な折れ曲げ手段（但し、フイルム折れ方向は逆である）
を施してフイルムのエッジを下側に２重に折り重ね、こ
の折り重ね部をステンタークリップに噛み込ませ、把持
させて横延伸する以外は、比較例２と同様に行って二軸
延伸フイルムを得た（実施例２）。A folding means as shown in FIG. 4 is provided on the uniaxially stretched film (however, the folding direction of the film is opposite).
The biaxially stretched film was produced in the same manner as in Comparative Example 2 except that the edge of the film was double-folded downward and the folded portion was bitten into the stenter clip, gripped and laterally stretched. Was obtained (Example 2).
【００２１】これらの製膜特性を表２に示す。Table 2 shows these film forming characteristics.
【００２２】[0022]
【表２】 [Table 2]
【００２３】以上の結果から、フイルム端部を長手方向
に連続的に折り重ね、該折り重ね部をテンタークリップ
に把持させた後、横延伸することによりエッジからの破
断が起こりにくくなることがわかる。From the above results, it is understood that the edge of the film is continuously folded in the longitudinal direction, the tenter clip holds the folded portion, and then the film is laterally stretched, so that breakage from the edge hardly occurs. .
【００２４】[0024]
【発明の効果】本発明によれば、熱可塑性フイルムをテ
ンターにより製造する際、エッジからの破断が起こりに
くくなり、薄い高強度フイルムを安定して製造できる。
本発明の方法で製膜された熱可塑性フイルムは、磁気テ
ープ用ベース，フロッピーディスク用ベース，コンデン
サー用，孔版印刷用等の用途に適している。According to the present invention, when a thermoplastic film is manufactured by a tenter, breakage from the edge hardly occurs, and a thin high-strength film can be stably manufactured.
The thermoplastic film formed by the method of the present invention is suitable for applications such as magnetic tape bases, floppy disk bases, capacitors, and stencil printing.
【図１】エッジを折り返したフイルムをクリップが把持
している状態を、フイルム流れ方向上流から見た図であ
る。FIG. 1 is a view of a state in which a clip holds a film whose edges are folded back, as viewed from the upstream side in the film flow direction.
【図２】フイルムエッジの折り返し方を示した図であ
る。FIG. 2 is a diagram showing how to fold a film edge.
【図３】平板を折りまげたエッジ折り具によりフイルム
エッジを折り返している状態を示す図である。FIG. 3 is a view showing a state in which a film edge is folded back by an edge folding tool that is a flat plate folded.
【図４】Ｕ字型の溝をもつ回転可能な円板によりフイル
ムエッジを折り返している状態を示す図である。FIG. 4 is a view showing a state in which a film edge is folded back by a rotatable disc having U-shaped grooves.
【図５】位置をずらして設置した２枚の平板によりフイ
ルムエッジを折り返している状態を示す図である。FIG. 5 is a diagram showing a state in which a film edge is folded back by two flat plates that are installed at different positions.
【図６】位置をずらして設置した２枚の回転可能な円板
によりフイルムエッジを折り返している状態を示す図で
ある。FIG. 6 is a diagram showing a state in which a film edge is folded back by two rotatable discs which are installed at different positions.
【図７】折りまげた板の中に仕切り板を設置した器具に
より、徐々にエッジを折っている状況を示す図である。FIG. 7 is a diagram showing a situation in which an edge is gradually folded by an instrument in which a partition plate is installed in a folded plate.
１１ テンタークリップ １２ フイルム １３ フイルム把持部 ｈ エッジ折り重ね幅 11 tenter clip 12 film 13 film grip h edge folding width
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 7:00 (72)発明者 廣岡 良顕 神奈川県相模原市小山３丁目37番19号 帝人株式会社 相模原研究センター内 (56)参考文献 特開 平２−238929（ＪＰ，Ａ) 特開 昭54−97676（ＪＰ，Ａ) 特開 昭62−87321（ＪＰ，Ａ) 特開 昭50−53464（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical display location B29L 7:00 (72) Inventor Yoshiaki Hirooka 3-37-19 Oyama, Sagamihara City, Kanagawa Teijin Limited (56) Reference JP-A-2-238929 (JP, A) JP-A-54-97676 (JP, A) JP-A-62-87321 (JP, A) JP-A-50-53464 (JP , A)
Claims (3)
イルムをテンターにより製造するに際し、テンターに供
するフイルムの端部を長手方向に連続的に折り重ね、該
折り重ね部をテンタークリップで把持しながら少くとも
横方向に延伸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。1. When manufacturing a thermoplastic resin film stretched at least in the transverse direction by a tenter, the end part of the film to be fed to the tenter is continuously folded in the longitudinal direction, and the folded part is held by a tenter clip. A method for producing a thermoplastic resin film, which comprises stretching the film in the transverse direction at least.
２０μｍ以下である請求項１記載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 thickness of the central portion of the film to be used in the tenter is 20 μm or less.
らに縦方向（長手方向）に延伸したフイルムである請求
項１記載の熱可塑性樹脂フイルムの製造方法。3. A method for producing a thermoplastic resin film of claim 1 wherein the film of the film subjected to tenter stretched further longitudinally after biaxial stretching (longitudinal direction).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4740791A JP2550225B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing thermoplastic resin film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4740791A JP2550225B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing thermoplastic resin film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04267127A JPH04267127A (en) | 1992-09-22 |
| JP2550225B2 true JP2550225B2 (en) | 1996-11-06 |
Family
ID=12774271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4740791A Expired - Fee Related JP2550225B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing thermoplastic resin film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2550225B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5082740B2 (en) * | 2007-10-09 | 2012-11-28 | ダイキン工業株式会社 | Biaxially stretched tape manufacturing method |
| JP5135008B2 (en) * | 2008-03-12 | 2013-01-30 | 三井化学東セロ株式会社 | Method for producing biaxially stretched film |
| JP5508501B2 (en) * | 2012-10-12 | 2014-06-04 | 三井化学東セロ株式会社 | Method for producing biaxially stretched film |
| JP6836849B2 (en) * | 2015-09-24 | 2021-03-03 | 日東電工株式会社 | Method for manufacturing optically anisotropic film |
| JP7076620B1 (en) * | 2021-09-24 | 2022-05-27 | 日東電工株式会社 | Method for manufacturing stretched film and method for manufacturing optical laminate |
-
1991
- 1991-02-21 JP JP4740791A patent/JP2550225B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04267127A (en) | 1992-09-22 |
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