JPS60110428A - Manufacture of biaxially oriented film made of extremely thin-filmed thermoplastic resin - Google Patents
Manufacture of biaxially oriented film made of extremely thin-filmed thermoplastic resinInfo
- Publication number
- JPS60110428A JPS60110428A JP58220061A JP22006183A JPS60110428A JP S60110428 A JPS60110428 A JP S60110428A JP 58220061 A JP58220061 A JP 58220061A JP 22006183 A JP22006183 A JP 22006183A JP S60110428 A JPS60110428 A JP S60110428A
- Authority
- JP
- Japan
- Prior art keywords
- film
- thickness
- clip
- tenter
- 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.)
- Granted
Links
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は1μ以下の極薄膜熱可塑性二輪延伸フィルムを
テンター法により製造する方法に関するものである。極
薄フィ゛ルムの用途としては、興味あるものがあり今後
とも様々に展開されると予想されるが、現在の断手型電
気コンデンサー、放射線センサー、音響振動子、透過膜
等があげられる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an extremely thin thermoplastic two-wheel stretched film of 1 μm or less by a tenter method. There are many interesting uses for ultra-thin films, and it is expected that they will continue to be used in a variety of ways, including current cut-off type electric capacitors, radiation sensors, acoustic vibrators, and transparent membranes.
極薄フィルムを得る方法としては、特開昭58−104
720号公報にみられるような特殊化合物をポリマーに
多量分散させて、やや厚手のフィルムを成膜延伸し、そ
の・後この特殊化合物を溶剤によりフィルムから抽出し
て1μ以下のフィルムを得る方法が知られているが、特
殊化合物および溶剤の選択が必要であるし、抽出時間、
溶剤の乾燥方法等々多くの問題点を有する。一方すでに
、我々は5μ以下の薄膜熱可塑性二輪延伸フィルムをテ
ンタ−法により製造する方法を特公昭57−52895
号公報で提案したが、二軸延伸フィルム厚さが1μ以下
となるとこれまでにない製造上の困難をともなうことは
いうまでもない。As a method for obtaining ultra-thin films, Japanese Patent Application Laid-Open No. 58-104
There is a method of dispersing a large amount of a special compound in a polymer, forming and stretching a somewhat thick film, as shown in Publication No. 720, and then extracting this special compound from the film with a solvent to obtain a film of 1μ or less. It is known that special compounds and solvent selection are required, and extraction times are
There are many problems such as the method of drying the solvent. On the other hand, we have already developed a method for producing a thin thermoplastic two-wheel stretched film with a thickness of 5μ or less using the tenter method in Japanese Patent Publication No. 57-52895.
Although it was proposed in the above publication, it goes without saying that if the thickness of the biaxially stretched film is less than 1 μm, it will be accompanied by unprecedented manufacturing difficulties.
テンター法によるフィルムの延伸は、未延伸フィルムあ
るいは縦−軸延伸フィルムの両端をクリップで把持しな
がら、縦横同時二軸あるいは横延伸するものであるが、
1μ以下の熱可塑性二軸延伸フィルムを製造する場合、
クリップとフィルムとの粘着力1両者の力学的ひっかか
り、その他の影響を受けフィルムがクリップから離れる
際フィルム厚さが極めて薄いため、フィルムのクリップ
把持部が裂けたり、クリップ把持部付近に局所的に応力
集中が発生し、切断につながる場合が多い。Stretching of a film by the tenter method involves holding both ends of an unstretched film or a longitudinally and axially stretched film with clips, and simultaneously stretching the film in the longitudinal and lateral directions or in the transverse direction.
When producing a thermoplastic biaxially stretched film of 1μ or less,
Adhesive force between the clip and the film 1 When the film is separated from the clip due to mechanical catching or other influences, the film thickness is extremely thin, so the clip gripping part of the film may tear or local damage may occur near the clip gripping part. Stress concentrations occur, often leading to breakage.
この種の切断はフィルム厚さが薄くなる程大きく、これ
を防止するにはクリップ把持部およびクリップ先端部か
らさらにフィルム中方向に沿ってフィルム中央部のフィ
ルム厚みをテンターでの延伸倍率に応じて厚くコントロ
ールする必要がある。This kind of cutting becomes more severe as the film thickness becomes thinner, and to prevent this, the film thickness at the center of the film should be adjusted from the clip gripping part and the clip tip further along the film direction according to the stretching ratio in the tenter. It needs to be tightly controlled.
このクリップ把持部およびクリップ近傍のフィルム厚さ
は単に厚ければ良いというものでなく。The thickness of the film near the clip gripping portion and the clip does not simply have to be thick.
一定収上に厚すぎるとクリップ把持部付近に応力集中が
発生し易く、クリップとフィルムが引かかりやすくなっ
たりして1反えって切断し易くなる。If the film is too thick for a certain amount of time, stress concentration tends to occur near the clip gripping part, and the clip and film tend to get caught, making it easy to curl and cut.
またフィルム端部のロスが大きくなり経済的に不利であ
る。Furthermore, loss at the edges of the film becomes large, which is economically disadvantageous.
我々はこのような知見を考慮に入れて検討を重ねた結果
、以下に述べる方法を発明するに至った。As a result of repeated studies taking such knowledge into consideration, we have come to invent the method described below.
すなわち、テンター法により1μ以下の熱可塑性樹脂二
軸延伸フィルムを製造するに際して、クリップ把持部内
のフィルム平均厚さTをt十z≦T≦t+7zとし、(
1はテンタ一部導入直前のフィルム中央部厚さくμ)で
あり、2とはテンタ一部での延伸倍率で縦倍率と横倍率
の積である。)フィルム中方向に沿ってフィルム中心側
のクリップ先端部のフィルム厚みTcがt≦Tc≦t+
3zであり、゛さらにフィルム中方向に沿って中心部へ
向うにしたがいクリップ掴みしろと等しい長さ領域で、
大略直線的にフィルム厚みをtまで漸減させたフィルム
をテンターで延伸することを特徴とする極薄膜熱可塑性
二輪延伸フィルムの製造方法である。That is, when producing a biaxially stretched thermoplastic resin film of 1 μm or less by the tenter method, the average thickness T of the film in the clip gripping portion is set to t0z≦T≦t+7z, and (
1 is the thickness (μ) at the center of the film immediately before part of the tenter is introduced, and 2 is the stretching ratio at the part of the tenter, which is the product of the longitudinal and lateral ratios. ) The film thickness Tc at the tip of the clip on the film center side along the film center direction is t≦Tc≦t+
3z, and ``Furthermore, along the inside direction of the film toward the center, in a length area equal to the clip gripping area,
This is a method for producing an ultra-thin thermoplastic two-wheel stretched film, which is characterized by stretching a film whose thickness is gradually reduced approximately linearly to t using a tenter.
本発明の方法によれば、クリップ把持部およびその近傍
のフィルム厚さがi/に通であるため、クリ、7プとフ
ィルムとが離れる際1両者の間の粘着力。According to the method of the present invention, since the film thickness at the clip gripping portion and the vicinity thereof is the same, when the clip and the film are separated, the adhesive force between the clip and the film is reduced.
両者間の力学的引かかり等に起因する。フィルムのクリ
ップ把持部での裂け、あるいはクリップ付近での応力集
中による切断等のトラブルを防止することが可能となる
。This is caused by a mechanical catch between the two. It is possible to prevent troubles such as tearing of the film at the clip gripping portion or breakage due to stress concentration near the clip.
このクリップ把持部およびその近傍での最適フィルム厚
さは前述のごとく、テンタ一部での延伸倍率に応じて変
える必要がある。延伸倍率が低ければクリップとフィル
ム間の粘着力、引かかり等の両者間の相互作用力は小さ
く、クリップ内およびクリップ近傍の厚みは小さくても
フィルム切断には到らない。前記厚みの条件を満足して
いないとフィルム厚みが前記条件より薄い場合はクリッ
プとフィルム間の粘着力や引・っかかりその他の力によ
りフィルムがクリップから離れる際9フィルム端部から
亀裂が走ったりフィルム端部が裂けた=5=
すする操業上のトラブルが発生するし、逆にフィルム端
部条件が上記条件より厚い場合にはクリップ付近での応
力集中や、延伸フィルム端部での厚みが中央部厚みより
極端に厚くなり、端部のロスが多くなる。クリップ近傍
の厚みをクリップ掴み内のフィルム中と等しい領域で上
記条件のように大略直線的に変化させることにより、上
述と同様のトラブル発生を相乗的に抑制できるのである
。As described above, the optimum film thickness at the clip gripping portion and the vicinity thereof needs to be changed depending on the stretching ratio in a portion of the tenter. If the stretching ratio is low, the adhesive force between the clip and the film, the interaction force between the two, such as catching, is small, and even if the thickness inside the clip and in the vicinity of the clip is small, the film will not be cut. If the film thickness is thinner than the above conditions, cracks may run from the edge of the film when the film separates from the clip due to adhesive force between the clip and the film, catching, catching, or other forces. The film edge is torn = 5 = Sipping operation problems will occur, and conversely, if the film edge condition is thicker than the above conditions, stress concentration near the clip and thickness at the stretched film edge may occur. It becomes extremely thicker than the center, and there is more loss at the edges. By changing the thickness near the clip approximately linearly in the same area as the inside of the film inside the clip grip, the occurrence of the same troubles as described above can be suppressed synergistically.
本発明はテンター法による逐次二軸延伸および同時二輪
延伸に通用されるものである。逐次二軸延伸の場合、一
段にロール群からなる縦延伸機で縦−軸延伸した後、テ
ンターによる横延伸を行うが、このテンター法による横
延伸時に本発明を適用できる。この場合テンターの延伸
倍率は横延伸のみであるので同時二軸延伸にくらべて、
クリップ把持部およびその近傍のフィルム厚みは同時二
軸よりも薄くて良い。同時二軸延伸では縦横延伸倍率の
積がトータルの延伸倍率となるので逐次二軸延伸のフィ
ルム厚みよりも少し厚くしなければならない。The present invention is applicable to sequential biaxial stretching and simultaneous two-wheel stretching using the tenter method. In the case of sequential biaxial stretching, after longitudinal-axial stretching is performed using a longitudinal stretching machine consisting of a group of rolls in one stage, transverse stretching is performed using a tenter, and the present invention can be applied to the transverse stretching using this tenter method. In this case, the stretching ratio of the tenter is only horizontal stretching, so compared to simultaneous biaxial stretching,
The film thickness at the clip gripping portion and its vicinity may be thinner than that for simultaneous biaxial use. In simultaneous biaxial stretching, the total stretching ratio is the product of the longitudinal and lateral stretching ratios, so the film must be slightly thicker than the film thickness in sequential biaxial stretching.
6−
本発明法を適用できるフィルムの素材としては高密度ポ
リエチレン、ポリプロピレン、ポリエチレンテレフタレ
ート、ポリブチレンテレフタレート、ナイロン6、ナイ
ロン66等の熱可塑性樹脂があげられる。6- Examples of film materials to which the method of the present invention can be applied include thermoplastic resins such as high-density polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, nylon 6, and nylon 66.
以下実施例により本発明を説明する。The present invention will be explained below with reference to Examples.
実施例および比較例
ポリエチレンテレフタレート樹脂を280℃で溶融し、
Tダイスより80℃の冷却ロール上で冷却し未延伸フィ
ルムを作った。この際未延伸フィルム端部と中央部のフ
ィルム厚さをTダイス厚み調整ボルト、Tダイスと冷却
ロールの引取位置関係。Examples and Comparative Examples Polyethylene terephthalate resin was melted at 280°C,
It was cooled from a T-die on a cooling roll at 80°C to produce an unstretched film. At this time, the film thickness at the ends and center of the unstretched film is adjusted using the T-die thickness adjustment bolt and the take-up position relationship between the T-die and the cooling roll.
吐出量、引取速度を種々変化させて表1のような試料を
作成し、これら未延伸フィルムを85℃で延伸倍率を種
々変化させ、テンター法により同時二軸延伸した後、2
00℃で熱固定した。表1に延伸結果を示す。延伸時の
クリップのフィルム掴みしろは25mmであった。表1
の結果よりクリップ内。Samples as shown in Table 1 were prepared by varying the discharge amount and take-up speed, and these unstretched films were simultaneously biaxially stretched by the tenter method at 85°C with various stretching ratios.
Heat-fixed at 00°C. Table 1 shows the stretching results. The film gripping margin of the clip during stretching was 25 mm. Table 1
In the clip from the result.
Claims (1)
フィルムを製造するに際して、クリップ把持部内のフィ
ルム平均厚さTをt十z≦T≦t+7zとし、フィルム
中方向に沿ってフィルム中心側のクリップ先端部のフィ
ルム厚みTcがt≦Tc≦t+3zであり、さらにフィ
ルム中方向に沿って中心部に向かうにしたがい、クリッ
プ掴みしろと等しい長さ領域で、大略直線的にフィルム
厚みをtまで漸減させたフィルムをテンターで延伸する
ことを特徴とする極薄膜熱可塑性樹脂二輪延伸フィルム
の製造方法。 t:テンタ一部導入直前のフィルム中央部厚さくμ) 2:テンタ一部での延伸倍率(倍)縦倍率と横倍率の積 T:クリソ・プ把持部内のフィルム平均厚さくμ)Tc
:クリンプ先端部フィルム厚み(μ)[Claims] 1. When producing a biaxially stretched thermoplastic resin film with a thickness of 1μ or less by the tenter method, the average thickness T of the film within the clip gripping portion is set to t0z≦T≦t+7z, and the film is stretched along the inside direction of the film. The film thickness Tc at the tip of the clip on the film center side satisfies t≦Tc≦t+3z, and furthermore, as the film goes toward the center along the film center direction, the film is approximately linearly stretched in a length region equal to the clip gripping margin. A method for producing an ultra-thin thermoplastic resin two-wheel stretched film, which comprises stretching a film whose thickness is gradually reduced to t using a tenter. t: Thickness of the central part of the film immediately before introducing a part of the tenter (μ) 2: Stretching ratio (times) at a part of the tenter Product of vertical and horizontal magnification T: Average thickness of the film in the gripping part of the tenter (μ) Tc
:Crimp tip film thickness (μ)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58220061A JPS60110428A (en) | 1983-11-22 | 1983-11-22 | Manufacture of biaxially oriented film made of extremely thin-filmed thermoplastic resin |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58220061A JPS60110428A (en) | 1983-11-22 | 1983-11-22 | Manufacture of biaxially oriented film made of extremely thin-filmed thermoplastic resin |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60110428A true JPS60110428A (en) | 1985-06-15 |
JPH0356530B2 JPH0356530B2 (en) | 1991-08-28 |
Family
ID=16745322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58220061A Granted JPS60110428A (en) | 1983-11-22 | 1983-11-22 | Manufacture of biaxially oriented film made of extremely thin-filmed thermoplastic resin |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60110428A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003025424A (en) * | 2001-07-17 | 2003-01-29 | Kuraray Co Ltd | Ethylene/vinyl alcohol copolymer film |
-
1983
- 1983-11-22 JP JP58220061A patent/JPS60110428A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003025424A (en) * | 2001-07-17 | 2003-01-29 | Kuraray Co Ltd | Ethylene/vinyl alcohol copolymer film |
Also Published As
Publication number | Publication date |
---|---|
JPH0356530B2 (en) | 1991-08-28 |
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