JPH0354613B2 - - Google Patents
Info
- Publication number
- JPH0354613B2 JPH0354613B2 JP60059447A JP5944785A JPH0354613B2 JP H0354613 B2 JPH0354613 B2 JP H0354613B2 JP 60059447 A JP60059447 A JP 60059447A JP 5944785 A JP5944785 A JP 5944785A JP H0354613 B2 JPH0354613 B2 JP H0354613B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- liquid
- cooling body
- cooling
- 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.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 64
- 238000001816 cooling Methods 0.000 claims description 63
- 238000000034 method Methods 0.000 claims description 19
- 229920005992 thermoplastic resin Polymers 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000010408 film Substances 0.000 description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 8
- -1 polyethylene Polymers 0.000 description 8
- 239000010409 thin film Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000874 polytetramethylene terephthalate Polymers 0.000 description 1
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/9175—Cooling of flat articles, e.g. using specially adapted supporting means by interposing a fluid layer between the supporting means and the flat article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
技術分野
本発明は熱可塑性樹脂フイルムの製造方法に関
するものである。更に詳細には、溶融した熱可塑
性樹脂をフイルム状に回転する冷却体の表面に形
成した液膜上に押出し、押出したフイルム状物を
液膜と密着させながら冷却固化することで熱可塑
性樹脂よりなるフイルムを製造する方法の改良に
関するものであり、比較的薄い均質な重合体樹脂
フイルムを高度の生産性を伴つて製造し得る改良
技術に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for producing a thermoplastic resin film. More specifically, molten thermoplastic resin is extruded onto a liquid film formed on the surface of a rotating cooling body in the form of a film, and the extruded film is brought into close contact with the liquid film as it cools and solidifies. The present invention relates to an improved method for manufacturing a film, and relates to an improved technique that allows relatively thin and homogeneous polymer resin films to be manufactured with high productivity.
従来技術
回転する冷却体表面（たとえばキヤステイング
ドラム面）に液体を薄く塗布して、溶融重合体の
フイルム状物をキヤステイングする技術は公知で
ある。たとえば、冷却体表面に有機液体やオイル
状物質を塗布する方法として特公昭35−10523号
公報、特開昭49−99166号公報、特開昭50−59457
号公報、特開昭50−76173号公報及び特開昭52−
15556号公報が、また、水を塗布する方法として
特開昭52−65564号公報等の技術が公知である。BACKGROUND OF THE INVENTION It is known to cast a film of molten polymer by applying a thin layer of liquid to the surface of a rotating cooling body (for example, the surface of a casting drum). For example, methods of applying an organic liquid or oily substance to the surface of a cooling body are disclosed in Japanese Patent Publication Nos. 35-10523, 49-99166, and 59-59457.
No. 76173, Japanese Patent Application Laid-Open No. 1976-76173
15556, and techniques such as Japanese Unexamined Patent Publication No. 52-65564 as a method of applying water are known.
回転している冷却体表面に液体を薄く塗布して
溶融重合体のフイルム状物をキヤステイングする
方法では、押出されたフイルム状物と冷却体（液
体）とが接触を開始する位置（時点）で、フイル
ム状物と冷却体表面の間に存在する液膜がフイル
ム状物と密着し、この密着力でフイルム状物や回
転する冷却体の表面に随伴する空気を排除するた
め、フイルム表面に欠点を形成する微小気泡の発
生が抑えられ、結果的に生産速度を大幅に上げる
ことができる。 In the method of casting a film of molten polymer by applying a thin layer of liquid onto the surface of a rotating cooling body, the position (point of time) at which the extruded film and the cooling body (liquid) begin contact is determined. The liquid film that exists between the film-like object and the surface of the cooling body adheres to the film-like object, and this adhesion force eliminates the air accompanying the film-like object and the surface of the rotating cooling body. The generation of microbubbles that cause defects is suppressed, and as a result, production speed can be significantly increased.
更に、液体を塗布することによつて回転する冷
却体表面は常時清浄に保持されるため、運転を中
断して該表面を洗浄する作業の頻度を少なくでき
るなどの利点もある。 Furthermore, since the surface of the rotating cooling body is kept clean at all times by applying the liquid, there is an advantage that the frequency of work to interrupt operation and clean the surface can be reduced.
しかしながら、これの従来技術は次のような欠
点を有する。回転する冷却体表面に液体を薄膜状
に塗布する場合、溶融フイルム状物が冷却体表面
で冷却され固化してゆく過程において液膜の一部
がフイルム状物及び固化したフイルムの両端に追
出され、そこにある程度蓄積したのち揮散・脱落
するか、またはフイルムによつて吸湿、吸着され
る。従つて、液体の塗布量はその際の熱可塑性樹
脂の中にとりこまれてしまう液量と冷却体両端部
の表面から揮散・脱落する量との和とのバランス
によつて定められる。このようにして、冷却体表
面に塗布される液体の薄膜の厚みは約10μｍ以下
となるようにコントロールされる。 However, this prior art has the following drawbacks. When applying a thin film of liquid to the surface of a rotating cooling body, as the molten film cools and solidifies on the surface of the cooling body, part of the liquid film is expelled onto both ends of the film and the solidified film. After accumulating to some extent, it evaporates and falls off, or it absorbs moisture and is adsorbed by the film. Therefore, the amount of liquid applied is determined by the balance between the amount of liquid that is taken into the thermoplastic resin and the amount that evaporates and falls off from the surfaces of both ends of the cooling body. In this way, the thickness of the thin film of liquid applied to the surface of the cooling body is controlled to be approximately 10 μm or less.
液体を薄膜状に塗布する場合、ダイスリツトよ
り押出されるフイルム状物の幅よりも少し広い
幅、たとえばフイルム状物の縁部より外側に５〜
20mm広くなるように、液体を塗布する必要があ
る。このような液膜厚み及び液膜の塗布幅によつ
て熱可塑性樹脂フイルムの成形が行なわれるが、
フイルム状物が接触した冷却体表面からは液膜の
一部が上記の過程により消費されるが、冷却体表
面が１回転して再度フイルム状物と接触する前に
新しい液膜が塗布されるために常時均一な液膜が
形成される。しかるに、樹脂フイルムが接触しな
い部位であるフイルムの両縁部の外側の冷却体面
上に於いては、塗布された液体は冷却体表面上に
蓄積される結果となり、所定量を超えて蓄積され
たときは冷却体表面上を流下するようになる。ま
た余剰に塗布された液体が、溶融押出しされた樹
脂から放出されるオリゴマーと混合して、冷却体
表面上でスラリー状となり冷却体表面を著しく汚
染する弊害が生じることがある。 When applying a liquid in a thin film, the width is slightly wider than the width of the film-like material extruded from the die slit, for example, 5 to
It is necessary to apply liquid so that it becomes 20 mm wider. Molding of thermoplastic resin film is carried out depending on the thickness of the liquid film and the coating width of the liquid film.
A part of the liquid film from the surface of the cooling body that has come into contact with the film-like object is consumed by the above process, but a new liquid film is applied before the surface of the cooling body rotates once and comes into contact with the film-like object again. Therefore, a uniform liquid film is always formed. However, on the surface of the cooling body outside both edges of the film, which are areas where the resin film does not come into contact, the applied liquid ends up accumulating on the surface of the cooling body, and the amount accumulated exceeds a predetermined amount. At this point, it begins to flow down on the surface of the cooling body. In addition, the excess liquid applied may mix with the oligomer released from the melt-extruded resin, forming a slurry on the surface of the cooling body, which may seriously contaminate the surface of the cooling body.
また、冷却体両端部の表面に余剰に付着した液
体は、冷却体の回転速度が高くなるに伴い、フイ
ルムの縁部の外側のみばかりでなく縁部の中の方
へも廻り込み、液体の薄膜の膜厚を乱すためフイ
ルム表面に欠点を生じさせることにもなる。 In addition, as the rotational speed of the cooling element increases, excess liquid adhering to the surfaces of both ends of the cooling element flows not only to the outside of the edge of the film but also to the inside of the edge. Since the film thickness of the thin film is disturbed, defects may be caused on the film surface.
このように、冷却体表面に液体を塗布して、そ
の上に溶融熱可塑性樹脂フイルム状に押出して冷
却固化させてフイルムを形成する方法は、なお未
解決の問題がある。 As described above, there are still unresolved problems with the method of forming a film by applying a liquid to the surface of a cooling body, extruding it onto the liquid into a molten thermoplastic resin film, and cooling and solidifying the liquid.
発明の目的
本発明の目的は冷却体表面とフイルムとの間に
空気を巻込むことを防止し、両者の間に小気泡の
生成することのない、熱可塑性樹脂フイルムを製
造する新しい方法を提供することにある。Purpose of the Invention The purpose of the present invention is to provide a new method for manufacturing a thermoplastic resin film that prevents air from being trapped between the surface of a cooling body and the film, and does not generate small bubbles between the two. It's about doing.
本発明の他の目的は厚み約250μ以下の比較的
薄い樹脂フイルムを、運転時の操業率を高く維持
しながら、高速で製造し、更に引続いて二軸延伸
することにより、二軸配向フイルムを高い生産条
件下で製造しうる方法を提供することにある。 Another object of the present invention is to produce a relatively thin resin film with a thickness of about 250μ or less at high speed while maintaining a high operating rate, and then to biaxially stretch the film, thereby producing a biaxially oriented film. The object of the present invention is to provide a method that allows the production of under high production conditions.
発明の構成及び効果
本発明者は熱可塑性樹脂フイルムの製造方法を
鋭意検討の結果樹脂フイルムの接触していない外
側部位の冷却体の縁部に相当する位置において、
余剰の液体を除去しつつ、樹脂フイルムのキヤス
テイング操作をすることによつて、上記の様な問
題点が解消でき、効率的にフイルムを生産しうる
ことを見出し本発明に至つたものである。Structure and Effects of the Invention The inventor of the present invention has conducted extensive studies on the method of manufacturing a thermoplastic resin film, and as a result, at a position corresponding to the edge of the cooling body at the outer part of the resin film that is not in contact with the resin film,
The inventors have discovered that the above-mentioned problems can be solved and films can be efficiently produced by performing a casting operation on the resin film while removing excess liquid, leading to the present invention. .
即ち、本発明は、回転する冷却体の表面に液膜
形成処理を施して薄い液膜を形成し、この液膜の
上に溶融した熱可塑性樹脂をフイルム状に押出
し、押出したフイルム状物を前記液膜と密着させ
ながら冷却固化し、固化したフイルムを回転冷却
体の表面から引き離すことで熱可塑性樹脂フイル
ムを製造する方法において、前記回転する冷却体
の表面に液膜形成処理を施す前に、冷却体表面の
前記フイルム状物と接触しない部位に存する余剰
の液を除去することを特徴とする熱可塑性樹脂フ
イルムの製造方法である。 That is, the present invention performs a liquid film forming process on the surface of a rotating cooling body to form a thin liquid film, extrudes a molten thermoplastic resin onto this liquid film in the form of a film, and then processes the extruded film-like material. In the method of manufacturing a thermoplastic resin film by cooling and solidifying the film while being in close contact with the liquid film and separating the solidified film from the surface of the rotating cooling body, before performing a liquid film forming treatment on the surface of the rotating cooling body. , a method for producing a thermoplastic resin film, characterized in that excess liquid existing on a portion of the surface of the cooling body that does not come into contact with the film-like material is removed.
本発明において冷却体の表面に薄い液膜を形成
する手段としては、従来から知られている手段例
えば液体を塗布する手段をはじめ、回転冷却体表
面が押出されたフイルム状物と接触する場所より
手前の空間を囲い、この囲の中に水蒸気を導き、
該水蒸気を回転冷却体の表面と接触させて凝縮さ
せ、凝縮した水で該表面上に薄い液膜を形成する
手段を用いることができる。 In the present invention, means for forming a thin liquid film on the surface of the cooling body include conventionally known means, such as means for applying liquid, and forming a thin liquid film on the surface of the rotary cooling body at a place where the surface of the rotary cooling body comes into contact with an extruded film-like material. Enclose the space in front and guide water vapor into this enclosure,
Means may be used in which the water vapor is brought into contact with the surface of the rotary cooling body and condensed, and the condensed water forms a thin liquid film on the surface.
回転冷却体の表面に液膜形成処理を施す前の段
階、すなわち固化したフイルムを回転冷却体の表
面から引き離した場所と回転冷却体の表面に液膜
形成処理を施して液膜を形成する場所との間の場
所に液体除去手段を配置する。 The stage before the liquid film formation treatment is applied to the surface of the rotary cooling body, that is, the place where the solidified film is separated from the surface of the rotary cooling body, and the place where the liquid film formation treatment is applied to the surface of the rotary cooling body to form a liquid film. A liquid removal means is placed between the
余剰の液体を除去する手段としては回転冷却体
表面に布帛、ゴムまたはスポンジ製のロール等を
接触させて払拭するか又はしぼり取ること、エア
ージエツトによつて吸引するか吹飛ばして除去す
ることができる。余剰の液体を除去する範囲は、
冷却体の表面にフイルムが接触した縁部より内側
へ10〜20mmの区域として、フイルムの縁部より外
側の冷却ドラムの表面の全区域（接触しない部
位）が好ましい。 Excess liquid can be removed by contacting the surface of the rotating cooling body with a roll made of cloth, rubber, or sponge and wiping it off or squeezing it out, or by suctioning or blowing it off with an air jet. . The area for removing excess liquid is
Preferably, the area is 10 to 20 mm inward from the edge where the film contacts the surface of the cooling body, and the entire area of the surface of the cooling drum outside the edge of the film (portion not in contact).
本発明が適用できる熱可塑性樹脂としてはポリ
エチレン、ポリプロピレンなどのポリオレフイ
ン、ポリヘキサメチレンアジパミドの如きポリア
ミド、及び次に述べるようなポリエステル、ポリ
カーボネートのホモポリマー、部分変性した共重
合体、ポリマーブレンド等が挙げられる。そのポ
リエステルとしては、ポリエチレンテレフタレー
ト、ポリトリメチレンテレフタレート、ポリテト
ラメチレンテレフタレート、ポリペンタメチレン
テレフタレート、ポリヘキサメチレンテレフタレ
ート、ポリエチレン−２，６−ナフタレート、ポ
リテトラメチレン−２，６−ナフタレート、ポリ
ヘキサメチレン−２，６−ナフタレート、ポリト
リメチレン−２，６−ナフタレート、ポリペンタ
メチレン−２，６−ナフタレート等が挙げられ
る。またポリカーボネートとして４，4′−ジヒド
ロキシジフエニル−２，２−プロパンのポリカー
ボネートが好ましく用いられる。 Thermoplastic resins to which the present invention can be applied include polyolefins such as polyethylene and polypropylene, polyamides such as polyhexamethylene adipamide, and homopolymers, partially modified copolymers, and polymer blends of polyesters and polycarbonates as described below. can be mentioned. The polyesters include polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polypentamethylene terephthalate, polyhexamethylene terephthalate, polyethylene-2,6-naphthalate, polytetramethylene-2,6-naphthalate, polyhexamethylene- Examples include 2,6-naphthalate, polytrimethylene-2,6-naphthalate, and polypentamethylene-2,6-naphthalate. As the polycarbonate, 4,4'-dihydroxydiphenyl-2,2-propane polycarbonate is preferably used.
次に、図面に参照して、本発明の実施態様につ
いて説明する。第１図は本発明の実施態様の１例
を示している。第１図において押出しダイ１１よ
り押出された溶融熱可塑性樹脂２０は一定速度で
回転せしめられている回転冷却体（冷却ドラム）
１３の表面上に押出される。一方液体の薄膜は液
膜形成処理の手段であるロール状の液体コーテイ
ング装置１４によつて冷却ドラム１３の表面上に
供給塗膜として形成され付着する。溶融状態で押
出されたフイルム状物はこの液膜を介して密着す
るように冷却ドラムの上に拡げられる。密着後冷
却ドラムの表面上で冷却固化せしめられたフイル
ム、すなわち熱可塑性樹脂未延伸フイルム２１は
取引ロール１５によつて冷却ドラムの表面より引
取られて次の延伸工程に送られる。冷却ドラム面
上で樹脂未延伸フイルムが接触しているよりも外
側に付着している余剰の液体は自由に回転するロ
ール１６を冷却ドラム面上に押し当てることによ
つて除去される。ロール１６の表面はゴム硬度20
度乃至60度の比較的軟らかいゴムをコーテイング
したもの又はスポンジ状の材料を被覆したものか
ら構成されている。ロール１６に付着した液体は
スクイズロール１７によつてしぼり取られ樋から
排出される。 Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an example of an embodiment of the invention. In FIG. 1, the molten thermoplastic resin 20 extruded from the extrusion die 11 is a rotary cooling body (cooling drum) that is rotated at a constant speed.
Extruded onto the surface of 13. On the other hand, a thin liquid film is formed as a supply coating film on the surface of the cooling drum 13 by a roll-shaped liquid coating device 14, which is a liquid film forming means, and adheres thereto. The film-like material extruded in a molten state is spread onto a cooling drum so as to be in close contact with the film through this liquid film. After the contact, the film cooled and solidified on the surface of the cooling drum, ie, the unstretched thermoplastic resin film 21, is taken off from the surface of the cooling drum by the transaction roll 15 and sent to the next stretching step. Excess liquid adhering to the outside of the surface of the cooling drum with which the unstretched resin film is in contact is removed by pressing the freely rotating roll 16 onto the surface of the cooling drum. The surface of the roll 16 has a rubber hardness of 20
It is made of a relatively soft rubber coating with a degree of 60 degrees or a sponge-like material. The liquid adhering to the roll 16 is squeezed out by the squeeze roll 17 and discharged from the gutter.
第２図及び第４図は本発明の別の実施態様を示
している。この場合余剰の液体は空気吹出口と吸
引口とを隣接して備えてなるエアーノズル２６
（第３図参照）を冷却ドラム面に接触しないよう
に設け、空気吹出口より空気を吹出し、吹出した
空気を吸引口より吸引することによつて除去され
る。なお第３図における矢印は空気の流れ方向を
示すものである。 2 and 4 show another embodiment of the invention. In this case, excess liquid is discharged through the air nozzle 26, which has an air outlet and a suction port adjacent to each other.
(See FIG. 3) is provided so as not to contact the surface of the cooling drum, air is blown out from the air outlet, and the blown air is removed by suctioning through the suction port. Note that the arrows in FIG. 3 indicate the direction of air flow.
本発明はこのような実施態様に限定されること
なく、その目的、仕様に応じた種々の変更が可能
である。たとえばロールでしぼり取る方法やエア
ーノズル２６の代りに布帛やブレード等でふき取
るなどの方法も用いることができる。 The present invention is not limited to such embodiments, and various changes can be made depending on the purpose and specifications. For example, methods such as squeezing it out with a roll or wiping it off with a cloth or blade instead of using the air nozzle 26 can also be used.
以下実施例により本発明を詳述する。 The present invention will be explained in detail with reference to Examples below.
実施例１及び比較例１
極限粘度（０−クロロフエノールを溶媒として
25℃で測定）が0.65のポリエチレンテレフタレー
トを押出機中で290℃に加熱溶融し、スリツト巾
1000mmの押出しダイから押出し、表面温度23℃の
キヤステイングドラム（直径800mm）表面で急冷
し、厚さ30μｍ、幅200μｍのフイルムとして引取
速度50ｍ／〓で引取つた。この際第１図に示した
方法によりキヤステイングした。キヤステイング
においては液体として水を塗布した。また、補助
手段として特公昭37−6142号公報に記載されてい
る静電密着法も併用した。このようにして14日間
連続運転したが未延伸フイルムは常時均一透明で
端部への水滴の廻り込みなどによる表面の欠点は
全く見られなかつた。また冷却ドラムの表面は全
面に渉つて常時に清浄に保たれ、運転を中断して
洗浄するなどの必要は全くなかつた。Example 1 and Comparative Example 1 Intrinsic viscosity (0-chlorophenol as solvent)
Polyethylene terephthalate (measured at 25°C) of 0.65 is heated and melted in an extruder at 290°C, and the slit width is
It was extruded from a 1000 mm extrusion die, rapidly cooled on the surface of a casting drum (diameter 800 mm) with a surface temperature of 23°C, and taken off as a film with a thickness of 30 μm and a width of 200 μm at a take-off speed of 50 m/〓. At this time, casting was carried out by the method shown in FIG. In casting, water was applied as a liquid. In addition, as an auxiliary means, an electrostatic adhesion method described in Japanese Patent Publication No. 37-6142 was also used. Although the film was continuously operated in this manner for 14 days, the unstretched film was always uniformly transparent and no surface defects such as water droplets surrounding the edges were observed. In addition, the entire surface of the cooling drum was kept clean at all times, and there was no need to interrupt operation for cleaning.
一方、本発明の手段を実施しない場合には運転
開始より３日後には冷却ドラム面のフイルムが接
触していない部分で、余剰の水と溶融ポリマーか
ら放出されたオリゴマーが混合し、スラリー状と
なつて堆積した。それが塗布された薄い水膜のフ
イルムの端部に相当する部分を汚染するためにフ
イルムの両端部の密着が不良となり製品の巾の歩
留りを低下させるというトラブルを発生した。 On the other hand, if the measures of the present invention are not implemented, excess water and oligomers released from the molten polymer will mix on the portion of the cooling drum surface that is not in contact with the film three days after the start of operation, resulting in a slurry. It grew and accumulated. This contaminates the thin water film on which it is applied, which corresponds to the ends of the film, resulting in poor adhesion between both ends of the film, resulting in a problem in which the yield of the width of the product is reduced.
実施例２及び比較例２
第４図に示した方法により厚さ1000μｍのフイ
ルムを30ｍ／〓で引取つた。この際用いた樹脂及
び溶融押出し条件は実施例１に示したものと同一
にした。キヤステイングドラムは直径1500mmのも
のを用い、表面温度は25℃に保持した。キヤステ
イングドラム面に形成される液膜としては水を用
いた。水を液体槽３１から樋状の加熱体３０に導
き加熱して水蒸気を発生させた。水蒸気は溶融樹
脂のフイルム状物２０、スリツトダイ１１の下
面、及び冷却ドラム面１３とで囲まれた空間に発
生するが、冷却ドラム面が冷却されているために
この面に凝縮して水の薄い膜が形成される。水の
薄い膜の厚みは水の蒸発量をコントロールするこ
とによつて一定に保たれる。Example 2 and Comparative Example 2 A film with a thickness of 1000 μm was taken at a rate of 30 m/〓 by the method shown in FIG. The resin and melt extrusion conditions used at this time were the same as those shown in Example 1. A casting drum with a diameter of 1500 mm was used, and the surface temperature was maintained at 25°C. Water was used as the liquid film formed on the surface of the casting drum. Water was introduced from the liquid tank 31 to the gutter-shaped heating element 30 and heated to generate water vapor. Water vapor is generated in a space surrounded by the molten resin film 20, the lower surface of the slit die 11, and the cooling drum surface 13, but since the cooling drum surface is cooled, it condenses on this surface and the water vapor is thin. A film is formed. The thickness of the thin water film is kept constant by controlling the amount of water evaporation.
フイルムが接触していない部分の縁部の余剰の
水分はエアーノズル２６によつて除去した。この
際、冷却ドラム表面とノズル先端との間隔を３mm
に保持して設けたエアーノズル２６の吹出口から
空気を30ｍ／秒で吹出し、隣接する吸引口より吸
引することで除去した。 Excess moisture on the edge of the area where the film was not in contact was removed by an air nozzle 26. At this time, the distance between the cooling drum surface and the nozzle tip should be 3 mm.
Air was blown out at a rate of 30 m/sec from the outlet of the air nozzle 26, which was held in place, and removed by suction from the adjacent suction port.
このような方法で１週間運転したが未延伸フイ
ルムは極めて均一透明であり、表面の欠点は全く
見られなかつた。本発明方法を実施しなかつた場
合は実施例１で示したようなトラブルを短時間で
発生した。 After operating in this manner for one week, the unstretched film was extremely uniform and transparent, and no surface defects were observed. When the method of the present invention was not carried out, troubles like those shown in Example 1 occurred in a short period of time.
第１図、第２図及び第４図は本発明の製造方法
を示す工程概略図である。また、第３図は２６で
示されるエアーノズルの構造概略図である。図面
において、１１はダイ、１３は冷却ロール（冷却
ドラム）、１４は冷却ロールに液体の薄膜を塗布
するコーター、１５は引取ロール、１６は余剰の
液体を除去するためのローラー、１７は１６のロ
ーラーに付いた液体をしぼり取るための排液装
置、２６はエアーノズル、３０は蒸気供給用の樋
で加熱装置を包含している。３１は液体の供給
槽、２０は溶融樹脂のフイルム状物、２１は冷却
固化された樹脂フイルムである。
FIG. 1, FIG. 2, and FIG. 4 are process schematic diagrams showing the manufacturing method of the present invention. Further, FIG. 3 is a structural schematic diagram of an air nozzle indicated by 26. In the drawing, 11 is a die, 13 is a cooling roll (cooling drum), 14 is a coater that applies a thin film of liquid to the cooling roll, 15 is a take-up roll, 16 is a roller for removing excess liquid, and 17 is a roller for removing excess liquid. A drain device for squeezing out the liquid adhering to the roller, 26 an air nozzle, and 30 a gutter for supplying steam, which includes a heating device. 31 is a liquid supply tank, 20 is a molten resin film, and 21 is a cooled and solidified resin film.
Claims (1)
て薄い液膜を形成し、この液膜の上に溶融した熱
可塑性樹脂をフイルム状に押出し、押出したフイ
ルム状物を前記液膜と密着させながら冷却固化
し、固化したフイルムを回転冷却体の表面から引
き離すことで熱可塑性樹脂フイルムを製造する方
法において、前記回転する冷却体の表面に液膜形
成処理を施す前に、冷却体表面の前記フイルム状
物と接触しない部位に存する余剰の液を除去する
ことを特徴とする熱可塑性樹脂フイルムの製造方
法。1. A liquid film forming process is applied to the surface of a rotating cooling body to form a thin liquid film, a molten thermoplastic resin is extruded onto this liquid film in the form of a film, and the extruded film is brought into close contact with the liquid film. In the method of manufacturing a thermoplastic resin film by cooling and solidifying the film while the cooling body is cooled and separating the solidified film from the surface of the rotating cooling body, before performing a liquid film formation treatment on the surface of the rotating cooling body, the surface of the cooling body is A method for producing a thermoplastic resin film, which comprises removing excess liquid present in areas that do not come into contact with the film-like material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60059447A JPS61219621A (en) | 1985-03-26 | 1985-03-26 | Manufacture of thermoplastic resin film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60059447A JPS61219621A (en) | 1985-03-26 | 1985-03-26 | Manufacture of thermoplastic resin film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61219621A JPS61219621A (en) | 1986-09-30 |
| JPH0354613B2 true JPH0354613B2 (en) | 1991-08-20 |
Family
ID=13113545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60059447A Granted JPS61219621A (en) | 1985-03-26 | 1985-03-26 | Manufacture of thermoplastic resin film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61219621A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0466921B2 (en) * | 1988-06-23 | 1999-07-28 | Toray Industries, Inc. | Process for producing polyester film |
| KR100770346B1 (en) | 2006-12-26 | 2007-10-25 | 주식회사 포스코 | Apparatus for preventing coating defect of coating unit |
| KR100770345B1 (en) | 2006-12-27 | 2007-10-25 | 주식회사 포스코 | Device for removing scattering solution in the insulation coating unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60131221A (en) * | 1983-12-20 | 1985-07-12 | Toray Ind Inc | Cooling solidifying device for discharged polymer |
-
1985
- 1985-03-26 JP JP60059447A patent/JPS61219621A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60131221A (en) * | 1983-12-20 | 1985-07-12 | Toray Ind Inc | Cooling solidifying device for discharged polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61219621A (en) | 1986-09-30 |
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