JPH0392323A - Manufacture of thermoplastic polymer sheet - Google Patents
Manufacture of thermoplastic polymer sheetInfo
- Publication number
- JPH0392323A JPH0392323A JP1229057A JP22905789A JPH0392323A JP H0392323 A JPH0392323 A JP H0392323A JP 1229057 A JP1229057 A JP 1229057A JP 22905789 A JP22905789 A JP 22905789A JP H0392323 A JPH0392323 A JP H0392323A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- nozzle
- electrode
- moving cooling
- cooling body
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 45
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 abstract description 29
- 239000000463 material Substances 0.000 abstract description 12
- 230000003068 static effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、熱可塑性重合体シートの製造方法、さらに詳
しくは、移動冷却体を利用した熱可塑性重合体シートの
冷却或形方法の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a thermoplastic polymer sheet, and more particularly to an improvement in a method for cooling or shaping a thermoplastic polymer sheet using a moving cooling body. It is something.
シートと移動冷却体との接点近傍に高電圧を印加した電
極とを設置し、静電気力により移動冷却体とシートを密
着・急冷させて熱可塑性重合体シートを製造する方法と
しては、特公昭３７−６１４２号公報、特公昭５５−４
５３７０号公報等がある。これらの方法は静電ピニング
法と呼ばれ、重合体シートの厚み均一性、透明性等を改
良する方法として有効であるが、移動冷却体の速度が早
くなると重合体シートと移動冷却体との間に気泡を捲き
込み易くなり、この気泡捲き込みにより重合体シートの
冷却が阻害されシート表面に凸凹が発生して致命的欠陥
となる。この原因は、特公昭６２−５１７３０号公報、
特開昭５９−１５０７２７号公報、特開昭５６−５３０
３７号公報等にも言及しているように、溶融された重合
体シートの両端部の移動冷却体と最初に接触する位置は
、溶融された重合体シートの中央部が移動冷却体と最初
に接触する位置よりも遅れ、この遅れ量は、高速での製
造速度になるほど顕著になり、電極あるいは絶縁チュー
ブが溶融された重合体シートに接触してしまうため、電
極の位置調整範囲に制限を受け、シート表面に凸凹が発
生しない電極位置が得られなくなってしまうためである
。このため、特公昭６２−５１７３０号公報では、電極
に特別な工夫をすることなしに押出しダイリップと移動
冷却体との位置関係を特定の式を満足する範囲に限定し
て端部のカール発生を軽減する方法が提案されているが
、若干の改善効果はあるものの本質的なカール解消には
なっていないこと、製膜条件ごとに押出しダイリップと
移動冷却体との位置関係を変更することは、巨大な設備
の位置変更のため困難である等の問題がある。また、特
開昭５６−５３０３７号公報では、溶融された重合体シ
ートが移動冷却体に接触する位置に応じてブレード電極
に湾曲を与える方法が提案されているが、製膜条件ごと
にブレード電極の湾曲の程度、幅が異なるために条件変
更による形状変更容易な設備を作ることが困難である問
題がある。また、特開昭５９−１５０７２７号公報では
、端部カール防止をノズルより吹き出す流体により溶融
された重合体シートとの端部を押さえつけることにより
実施し、電極が溶融された重合体シートとの接触を防止
し、電極調整可能範囲を広げることにより高速度での製
造速度を実現しようとするものであるが、電極とノズル
との火花放電防止のためにセラミック、テフロン等の誘
電体をノズル材質としているために、ノズルと溶融され
た重合体シートとの間の静電気力により該シートが引き
つけられ、これを防止するためにノズルより吹き出され
る流体の流量を過大の量にする必要があった。このため
、該シート中央部まで流体の影響が波及し、該シートの
振動による厚み均一性不良、該シ一ト端部の幅変動等の
問題がある。A method of manufacturing a thermoplastic polymer sheet by installing an electrode to which a high voltage is applied near the contact point between the sheet and the moving cooling body, and bringing the moving cooling body and the sheet into close contact with each other by electrostatic force and rapidly cooling the sheet is disclosed in Japanese Patent Publication No. 37 -6142 Publication, Special Publication No. 55-4
There are publications such as No. 5370. These methods are called electrostatic pinning methods, and are effective as methods for improving the thickness uniformity, transparency, etc. of polymer sheets, but as the speed of the moving cooling body increases, the relationship between the polymer sheet and the moving cooling body becomes It becomes easy for air bubbles to be drawn in between the sheets, and this air bubble entrainment impedes cooling of the polymer sheet and causes unevenness on the sheet surface, resulting in a fatal defect. The cause of this is the Japanese Patent Publication No. 62-51730,
JP-A-59-150727, JP-A-56-530
As mentioned in Publication No. 37, etc., the position where both ends of the molten polymer sheet first come into contact with the moving cooling body is such that the central part of the molten polymer sheet first contacts the moving cooling body. This delay becomes more noticeable as the production speed increases, and the electrode or insulating tube comes into contact with the molten polymer sheet, which limits the adjustment range of the electrode position. This is because it becomes impossible to obtain an electrode position that does not cause unevenness on the sheet surface. For this reason, in Japanese Patent Publication No. 62-51730, curling at the ends is prevented by limiting the positional relationship between the extrusion die lip and the moving cooling body to a range that satisfies a specific formula without making any special improvements to the electrodes. Methods to reduce curling have been proposed, but although they have some improvement effects, they do not essentially eliminate curling, and changing the positional relationship between the extrusion die lip and the moving cooling body for each film forming condition is There are problems such as difficulty in relocating huge equipment. Furthermore, in Japanese Patent Application Laid-Open No. 56-53037, a method is proposed in which the blade electrode is curved depending on the position where the molten polymer sheet contacts the moving cooling body. There is a problem in that it is difficult to create equipment whose shape can be easily changed due to different degrees of curvature and width. Furthermore, in JP-A No. 59-150727, the prevention of end curling is carried out by pressing the end of the melted polymer sheet with a fluid blown out from a nozzle, and the electrode is prevented from coming into contact with the melted polymer sheet. In order to prevent spark discharge between the electrode and the nozzle, dielectric materials such as ceramics and Teflon are used as the nozzle material to prevent spark discharge between the electrode and the nozzle. Therefore, the electrostatic force between the nozzle and the molten polymer sheet attracts the sheet, and in order to prevent this, it is necessary to increase the flow rate of the fluid ejected from the nozzle. For this reason, the influence of the fluid spreads to the center of the sheet, causing problems such as poor thickness uniformity due to vibration of the sheet and width fluctuations at the ends of the sheet.
このように、静電ピニング法により高速の製造速度を得
ようとするには、端部カール対策が重要であるが未だ十
分ではない。端部カール対策を施すことなく電極の改良
（特公昭５３−６１８０号公報）、電極近傍雰囲気の改
良（特開昭５３−１４３６５９号公報、特公昭５０−２
８１０８号公報）、原料による改良（特公昭５３−４０
２３１号公報）等の高速の製造速度を得ようとする種々
の提案があるが、それぞれ改良効果はあるものの、最終
的には端部カールにより上限速度が決定されていた。As described above, in order to obtain a high manufacturing speed using the electrostatic pinning method, countermeasures against curling of the end portions are important, but are not yet sufficient. Improvement of the electrode without taking measures against end curl (Japanese Patent Publication No. 53-6180) and improvement of the atmosphere near the electrode (Japanese Patent Application Laid-open No. 143659/1989, Japanese Patent Publication No. 53-1982)
8108 Publication), improvement by raw materials (Special Publication No. 53-40
There have been various proposals for achieving a high production speed, such as Japanese Patent No. 231 (Japanese Patent Publication No. 231), but although each has an improvement effect, the upper limit speed is ultimately determined by end curl.
本発明は、上記従来技術の欠点を解消せしめ、製造速度
が高められる重合体シートの製造方法を提供せんとする
ものである。SUMMARY OF THE INVENTION The present invention aims to eliminate the drawbacks of the prior art described above and provide a method for producing a polymer sheet that can increase production speed.
本発明は、溶融した熱可塑性重合体を押出しダイより移
動冷却体上にシート状に押出し、シートと移動冷却体と
の接点近傍に高電圧を印加した電極を設置し、静電気力
により移動冷却体とシートとを密着・急冷させるととも
に、該電極近傍に設けられたノズルから該シートの両端
部に流体を吹き付ける熱可塑性重合体シートの製造方法
において、該ノズルの材質を導電性物質とし、かつ該ノ
ズルが電気的に接地されていることを特徴とする熱可塑
性重合体シートの製造方法、および、該ノズルの材質を
導電性物質とし、かつ該ノズルに高電圧を印加すること
を特徴とする熱可塑性重合体シートの製造方法、および
該ノズルの材質を導電性部質とし、かつ該ノズルが高抵
抗を介して電気的に接地されていることを特徴とする熱
可塑性重合体シートの製造方法である。In the present invention, a molten thermoplastic polymer is extruded into a sheet from an extrusion die onto a moving cooling body, an electrode to which a high voltage is applied is installed near the contact point between the sheet and the moving cooling body, and the moving cooling body is generated by electrostatic force. A method for manufacturing a thermoplastic polymer sheet in which a sheet is brought into close contact with the sheet and cooled quickly, and a fluid is sprayed onto both ends of the sheet from a nozzle provided near the electrode, the material of the nozzle being a conductive material, and the sheet being A method for producing a thermoplastic polymer sheet, characterized in that a nozzle is electrically grounded, and a method for producing a thermoplastic polymer sheet, characterized in that the nozzle is made of a conductive material, and a high voltage is applied to the nozzle A method for producing a plastic polymer sheet, and a method for producing a thermoplastic polymer sheet, characterized in that the nozzle is made of a conductive material, and the nozzle is electrically grounded through a high resistance. be.
本発明に適用される熱可塑性重合体とは、ポリエチレン
、ポリプロピレン等のポリオレフイン類、ポリエチレン
テレフタレート等のポリエステル類、ナイロン等のボリ
アミド類、他ポリイミド類、ポリフェニレンサルファイ
ド、ポリスチレン、ポリビニル類、等のシートとして成
形され得る重合体およびこれらの共重合体、混合体であ
って、他の添加剤などが含有されたものであってもよい
。Thermoplastic polymers applied to the present invention include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon, other polyimides, polyphenylene sulfide, polystyrene, polyvinyls, etc. It may be a moldable polymer, a copolymer thereof, or a mixture containing other additives.
押出しダイより押出される溶融された重合体シートは、
単層でも多層に積層されたものでもよく、厚さも特に限
定されるものではないが、厚さが０．０１〜２ｍｍ１好
ましくは０．０２ 〜１ｍｍのものに適用するのが望ま
しい。The molten polymer sheet extruded from the extrusion die is
It may be a single layer or a multi-layered one, and the thickness is not particularly limited, but it is desirable to apply it to a thickness of 0.01 to 2 mm, preferably 0.02 to 1 mm.
本発明に適用される装置は、押出しダイと移動冷却体と
、押出しダイから押出された溶融重合体シートが移動冷
却体に接触する点の近傍で、かつ該シートが移動冷却体
に接しない側に設けられた電極とを具備した周知の溶融
製膜装置にノズルを設けた装置であって、該ノズルは重
合体シートの端部に対して流体を吹き付ける構造のもの
であればよいが、材質は金属他カーボン等の導電性を有
するものを選択する必要がある。該ノズルの材質として
誘電体材料を使用すると、溶融された重合体シートがノ
ズルに静電気力によって引きつけられるため該シート端
部の密着性が悪くなり、ノズルより吹き出される流体に
よる押し付け力が阻害され、効果が減ぜられるので好ま
しくない。ノズル材質を導電性物質とし、ノズル表面に
析出する静電気を除去するためにノズルを電気的に接地
するのが好ましい。しかし、ノズルを電気的に接地させ
ると、電極とノズルとの間の電位差、距離、ノズル及び
電極形状によっては、電極・ノズル間に火花放電を起こ
すことがある。火花放電を起こすと、電極の静電ピニン
グ効果が一瞬失われるため、重合体シート上に静電ピニ
ングがかかつていない部分が生じ線状に欠点が生じるこ
とと、重合体端部が脈動を起こすので好ましくない。こ
の火花放電を防止するために、絶縁体をノズルに被覆さ
せると、誘電材料で作或したノズルを使う場合と同様に
、溶融された重合体シートがノズルに静電気力によって
引き付けられるので好ましくなく、ノズルと電極との間
の電位差を小さくすれば火花放電を防止できることは自
明であるが、ノズルに電位を与えると電極の静電ピニン
グ効果が減少してくる。ノズルと電極を同電位とした場
合には、導電性ノズルを設置したことによる電極の静電
ピニング効果は、電極単体での静電ピニング効果とほぼ
同等である。ノズルの電位を電極の電位よりも低くし、
電極とノズルとの間の電位差を０． ５ｋＶ以上にと
ると、導電性ノズルによる電極の静電ビニング効果の増
加が認められ好ましい。ノズルと電極との間の距離は、
火花放電しない範囲で狭くとるのが好ましいが、現実的
には、１ｍｍ以上、電極との移動冷却体間距離の２倍ま
でが好ましい。１ｍｍ以下に狭めると、ノズル形状を工
夫してもノズルと電極との間の火花放電が電位差０．５
ｋＶ以上の条件下では発生するので好ましくない。また
電極と移動冷却体間距離の２倍以上の距離をとると、導
電性のノズルを接地したことによる電極の静電ピニング
効果の増加が認められないので好ましくない。The apparatus applied to the present invention includes an extrusion die, a moving cooling body, and a molten polymer sheet extruded from the extrusion die near the point where it contacts the moving cooling body, and on a side where the sheet does not contact the moving cooling body. This device is a well-known melt film forming device equipped with a nozzle, which is equipped with an electrode provided on the polymer sheet, and the nozzle may have a structure that sprays a fluid against the end of the polymer sheet. It is necessary to select a conductive material such as metal or carbon. When a dielectric material is used as the material for the nozzle, the molten polymer sheet is attracted to the nozzle by electrostatic force, resulting in poor adhesion at the ends of the sheet, which impedes the pressing force of the fluid blown out from the nozzle. , which is not preferable because the effect is reduced. It is preferable that the nozzle material be a conductive substance and that the nozzle be electrically grounded in order to remove static electricity deposited on the nozzle surface. However, when the nozzle is electrically grounded, spark discharge may occur between the electrode and the nozzle depending on the potential difference, distance, and shape of the nozzle and electrode between the electrode and the nozzle. When spark discharge occurs, the electrostatic pinning effect of the electrode is momentarily lost, resulting in areas where electrostatic pinning has never occurred on the polymer sheet, resulting in linear defects and pulsation at the polymer edges. So I don't like it. Coating the nozzle with an insulating material to prevent this spark discharge is undesirable because the molten polymer sheet is attracted to the nozzle by electrostatic forces, similar to the case with nozzles made of dielectric materials. Although it is obvious that spark discharge can be prevented by reducing the potential difference between the nozzle and the electrode, applying a potential to the nozzle reduces the electrostatic pinning effect of the electrode. When the nozzle and the electrode are at the same potential, the electrostatic pinning effect of the electrode due to the installation of the conductive nozzle is almost equivalent to the electrostatic pinning effect of the electrode alone. The nozzle potential is lower than the electrode potential,
The potential difference between the electrode and the nozzle is set to 0. When the voltage is set to 5 kV or higher, an increase in the electrostatic binning effect of the electrode due to the conductive nozzle is observed, which is preferable. The distance between the nozzle and the electrode is
It is preferable to set the distance as narrow as possible without causing spark discharge, but in reality, it is preferably 1 mm or more and up to twice the distance between the electrode and the moving cooling body. If the diameter is narrowed to 1 mm or less, the spark discharge between the nozzle and the electrode will be reduced to a potential difference of 0.5 even if the nozzle shape is devised.
This is not preferable because it occurs under conditions of kV or higher. Further, if the distance is twice or more the distance between the electrode and the moving cooling body, it is not preferable because an increase in the electrostatic pinning effect of the electrode due to grounding the conductive nozzle is not observed.
なお、この装置における移動冷却体とは、冷却ローラー
、冷却ベルト等で、これらの複合体も含まれるものとす
る。Note that the moving cooling body in this device refers to cooling rollers, cooling belts, etc., and also includes composites thereof.
電極とは、金属のほかカーボン等の導電性を有するもの
で、その形状は、ワイヤー状、針状、ナイフ状、バンド
状など任意の形状のものが含まれる。The electrode is a conductive material such as carbon or the like in addition to metal, and its shape includes any shape such as wire, needle, knife, and band shape.
絶縁チューブとは、電極と移動冷却体間において、重合
体シートが介在していない部分の電極を覆うための絶縁
材であって、材質は周知の絶縁性を有するものであれば
、なんであってもよく、また、形状は特に限定されるも
のではないが筒状であるのが電極上を移動させることが
できるので好ましい。The insulating tube is an insulating material between the electrode and the moving cooling body to cover the part of the electrode where the polymer sheet is not interposed, and the material may be any material as long as it has well-known insulating properties. Although the shape is not particularly limited, a cylindrical shape is preferable since it can be moved on the electrode.
ノズルとは、重合体シートの端部に対して流体を吹き付
ける構造のものであればよいが、材質は金属のほかカー
ボン等の導電性を有するものを選択する必要がある。導
電性物質で作られたノズルは、電極との距離にもよるが
、高圧印加された電極とノズルとの間で火花放電の危険
性があるので該ノズルに高電圧を印加し、電極との電位
差を０．５ｋＶ以上に設定するか、あるいは高抵抗を介
してノズルを電気的に接地してもよい。The nozzle may be any structure that sprays fluid onto the end of the polymer sheet, but it is necessary to select a material that is electrically conductive, such as metal or carbon. For nozzles made of conductive materials, there is a risk of spark discharge between the nozzle and the electrode to which high voltage is applied, depending on the distance to the electrode. The potential difference may be set to 0.5 kV or more, or the nozzle may be electrically grounded via a high resistance.
実施例１
第１図の装置を用いて、極限粘度０。６２のポリエチレ
ンテレフタレートを押出温度２９０゜Ｃで口金から溶融
押出し、このシート状の押出物に静電荷を印加し、キャ
スティングドラムに押しっけ急冷し、幅５００ｍｍ，厚
み１００μｍのシートを得た。静電荷は、金属ワイヤ電
極で印加し、シ一ト端部は、銅製のエアノズルを電極の
シートと反対側５ｍｍ離れたところに設置した。このノ
ズルは、電気的に接地されており、シート端部にエアを
吹き付けた。このとき、電極位置の適正化により、シー
ト引取り速度は６０ｍ／分となった。Example 1 Using the apparatus shown in Fig. 1, polyethylene terephthalate with an intrinsic viscosity of 0.62 was melt-extruded from a die at an extrusion temperature of 290°C, an electrostatic charge was applied to this sheet-like extrudate, and it was pushed onto a casting drum. The mixture was quenched to obtain a sheet with a width of 500 mm and a thickness of 100 μm. Static charge was applied using a metal wire electrode, and a copper air nozzle was placed at the end of the sheet at a distance of 5 mm from the opposite side of the electrode sheet. This nozzle was electrically grounded and blew air onto the edge of the sheet. At this time, the sheet take-up speed was 60 m/min by optimizing the electrode position.
このときのシート表面には、気泡捲き込みによる凸凹は
、みられなかった。At this time, no unevenness due to air bubble entrainment was observed on the sheet surface.
実施例２
実施例１と同様にしてシートを得た。ただこのとき、銅
製エアノズルに、電極より１ｋＶ低い電圧をかけていた
。このとき、シート引取り速度は、８０ｍ／分となり、
シート表面には、気泡捲き込みによる凸凹は、みられな
かった。Example 2 A sheet was obtained in the same manner as in Example 1. However, at this time, a voltage 1 kV lower than the electrode was applied to the copper air nozzle. At this time, the sheet take-up speed is 80 m/min,
No unevenness due to air bubble entrainment was observed on the sheet surface.
比較例１
実施例１と同様にしてシートを得た。ただしエアノズル
は、絶縁性のテフロン製のものを用いた。Comparative Example 1 A sheet was obtained in the same manner as in Example 1. However, the air nozzle used was made of insulating Teflon.
このとき、シート引取り速度が５０ｍ／分に達すると、
シートとキャスティングドラムの間に気泡が捲きこまれ
、シート表面に凸凹の欠点が生じた。At this time, when the sheet take-up speed reaches 50 m/min,
Air bubbles were trapped between the sheet and the casting drum, causing uneven defects on the sheet surface.
本発明は、重合体シートの製造方法において、移動冷却
体に密着するまでの溶融押出しされた重合体シートを帯
電させ、かつその重合体シートの両端部に、接地された
導電性ノズルから流体を吹きつける製造方法としたので
、重合体シートの両端部の移動冷却体への密着性が向上
し、製造速度を２０％以上高めることが可能となった。The present invention provides a method for producing a polymer sheet, in which a melt-extruded polymer sheet is electrically charged until it comes into close contact with a moving cooling body, and a fluid is applied to both ends of the polymer sheet from grounded conductive nozzles. By using the spraying manufacturing method, the adhesion of both ends of the polymer sheet to the moving cooling body was improved, making it possible to increase the manufacturing speed by 20% or more.
第１図は、本発明の実施に使用する装置の一例を示す。 １・・・押出しダイ ２・・・移動冷却体 ３・・・電極 ４・・・ノズル FIG. 1 shows an example of an apparatus used to implement the present invention. 1...Extrusion die 2... Mobile cooling body 3...electrode 4... Nozzle
Claims (3)
却体上にシート状に押出し、シートと移動冷却体との接
点近傍に高電圧を印加した電極を設置し、静電気力によ
り移動冷却体とシートとを密着・急冷させるとともに、
該電極近傍に設けられたノズルから該シートの両端部に
流体を吹き付ける熱可塑性重合体シートの製造方法にお
いて、該ノズルの材質を導電性物質とし、かつ該ノズル
が電気的に接地されていることを特徴とする熱可塑性重
合体シートの製造方法。(1) The molten thermoplastic polymer is extruded into a sheet from an extrusion die onto a moving cooling body, and an electrode to which a high voltage is applied is installed near the contact point between the sheet and the moving cooling body, and the moving cooling body is moved by electrostatic force. In addition to closely contacting and rapidly cooling the sheet,
In a method for producing a thermoplastic polymer sheet in which fluid is sprayed onto both ends of the sheet from a nozzle provided near the electrode, the nozzle is made of a conductive material, and the nozzle is electrically grounded. A method for producing a thermoplastic polymer sheet characterized by:
却体上にシート状に押出し、シートと移動冷却体との接
点近傍に高電圧を印加した電極を設置し、静電気力によ
り移動冷却体とシートとを密着・急冷させるとともに、
該電極近傍に設けられたノズルから該シートの両端部に
流体を吹き付ける熱可塑性重合体シートの製造方法にお
いて、該ノズルの材質を導電性物質とし、かつ該ノズル
に高電圧を印加することを特徴とする熱可塑性重合体シ
ートの製造方法。(2) The molten thermoplastic polymer is extruded into a sheet from an extrusion die onto the moving cooling body, and an electrode to which a high voltage is applied is installed near the contact point between the sheet and the moving cooling body, and the moving cooling body is moved by electrostatic force. In addition to closely contacting and rapidly cooling the sheet,
A method for producing a thermoplastic polymer sheet in which a fluid is sprayed onto both ends of the sheet from a nozzle provided near the electrode, characterized in that the nozzle is made of a conductive material and a high voltage is applied to the nozzle. A method for producing a thermoplastic polymer sheet.
却体上にシート状に押出し、シートと移動冷却体との接
点近傍に高電圧を印加した電極を設置し、静電気力によ
り移動冷却体とシートとを密着・急冷させるとともに、
該電極近傍に設けられたノズルから該シートの両端部に
流体を吹き付ける熱可塑性重合体シートの製造方法にお
いて、該ノズルの材質を導電性物質とし、かつ該ノズル
が高抵抗を介して電気的に接地されていることを特徴と
する熱可塑性重合体シートの製造方法。(3) The molten thermoplastic polymer is extruded into a sheet from an extrusion die onto the moving cooling body, and an electrode to which a high voltage is applied is installed near the contact point between the sheet and the moving cooling body, and the moving cooling body is moved by electrostatic force. In addition to closely contacting and rapidly cooling the sheet,
In a method for producing a thermoplastic polymer sheet in which a fluid is sprayed onto both ends of the sheet from a nozzle provided near the electrode, the nozzle is made of a conductive material, and the nozzle is electrically conductive through a high resistance. A method for producing a thermoplastic polymer sheet, characterized in that it is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1229057A JPH0392323A (en) | 1989-09-04 | 1989-09-04 | Manufacture of thermoplastic polymer sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1229057A JPH0392323A (en) | 1989-09-04 | 1989-09-04 | Manufacture of thermoplastic polymer sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0392323A true JPH0392323A (en) | 1991-04-17 |
Family
ID=16886068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1229057A Pending JPH0392323A (en) | 1989-09-04 | 1989-09-04 | Manufacture of thermoplastic polymer sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0392323A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5494619A (en) * | 1994-10-18 | 1996-02-27 | Eastman Kodak Company | Improved electrostatic pinning method |
-
1989
- 1989-09-04 JP JP1229057A patent/JPH0392323A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5494619A (en) * | 1994-10-18 | 1996-02-27 | Eastman Kodak Company | Improved electrostatic pinning method |
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