JPH0557093B2 - - Google Patents
Info
- Publication number
- JPH0557093B2 JPH0557093B2 JP63155800A JP15580088A JPH0557093B2 JP H0557093 B2 JPH0557093 B2 JP H0557093B2 JP 63155800 A JP63155800 A JP 63155800A JP 15580088 A JP15580088 A JP 15580088A JP H0557093 B2 JPH0557093 B2 JP H0557093B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid film
- cooling surface
- water
- sheet
- casting
- 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 33
- 238000001816 cooling Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 229920000642 polymer Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 16
- 230000005499 meniscus Effects 0.000 claims description 11
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- -1 polyethylene terephthalate Polymers 0.000 description 13
- 239000004734 Polyphenylene sulfide Substances 0.000 description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920006380 polyphenylene oxide Polymers 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920000305 Nylon 6,10 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- RFOAUKUDIHSTHA-UHFFFAOYSA-N O=C1OCC2CCCCC2COC(=O)C2=CC=C1C=C2 Chemical compound O=C1OCC2CCCCC2COC(=O)C2=CC=C1C=C2 RFOAUKUDIHSTHA-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 1
- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000009736 wetting Methods 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
- B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
-
- 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
-
- 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
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9165—Electrostatic pinning
-
- 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
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
〔産業上の利用分野〕
本発明は溶融重合体シートのキヤスト方法に関
するものである。
〔従来の技術〕
溶融重合体シートのキヤスト方法としては、水
などの液膜を冷却表面に形成させながらキヤスト
する方法は特開昭58−63415などで知られている。
〔発明が解決しようとする課題〕
しかし、上記の従来キヤスト方法では、次のよ
うな問題点を有している。
(1) 冷却表面上に、水などの液膜を10μm以下に
均一に連続膜を形成することは非常にむずかし
く、水膜の厚みむらや、不連続膜が存在する
と、そのままキヤスト欠点となる。
(2) 特に水などの液膜を2μm以下好ましくは1μm
以下とうすくする必要のある時は、均一な連続
膜を形成することが出来ず、事実上キヤストは
出来ない。
〔課題を解決するための手段〕
本発明は、上記欠点を改善し、水の膜厚に変動
があつても高速で、しかも経時と共に安定したキ
ヤスト方法を提供することを目的としている。す
なわち、本発明は、溶融重合体シートを、結露法
によつて得られた水の不連続液膜を有した冷却表
面上にて密着成形するキヤスト方法において、該
冷却表面上に介在する水の平均液膜厚さｄと、該
溶融重合体シートと冷却表面との接する位置に形
成されるメニスカスの高さｈとが、ｈ＞ｄである
ことを特徴とする溶融重合体シートのキヤスト方
法に関するものである。
冷却装置としては、ドラム状の回転体や、ベル
トの如き、移動可能なものであり、冷却表面とし
ては、公知の鏡面クロムメツキ仕上げをしたもの
や、必要によつては表面をエツチングやサンドブ
ラストなどの手段で表面を粗面化した表面さらに
は親水化剤コーテイング表面であつてもよいが、
安定キヤスト性や再現性、経日安定性の面から鏡
面仕上げが好ましい。溶融重合体とは、熱可塑性
ポリマーに代表される重合体で、熱可塑性ポリマ
ーとは、加熱すると塑性を示すポリマーであり、
化学構造的には線状高分子である。代表的なポリ
マーとしては、ポリエチレンテレフタレート、ポ
リエチレンナフタレート、ポリブチレンテレフタ
レート、ポリエチレンα，β−ビス（２−クロル
フエノキシ）エタン４，4′−ジカルボキシレー
ト、Ｐ−ヘキサヒドロ・キシリレンテレフタレー
トからのポリマー、１，４シクロヘキサンジメタ
ノールからのポリマー、ポリ−Ｐ−エチレンオキ
シベンゾエート、ポリアリレート、ポリカーボネ
ートなど及びそれらの共重合体で代表されるよう
に主鎖にエステル結合を有するポリエステル類、
更にナイロン６、ナイロン66、ナイロン610、ナ
イロン12、ナイロン11などで代表されるように、
主鎖にアミド結合を有するポリアミド類、ポリエ
チレン、ポリプロピレン、エチレン酢酸ビニル共
重合体、ポリメチルペンテン、ポリブテン、ポリ
イソブチレン、ポリスチレン、などで代表される
ように主としてハイドロカーボンのみからなるポ
リオレフイン類、ポリエーテルサルフオン
（PES）、ポリフエニレンオキサイド（PPO）、ポ
リエーテルエーテルケトン（PEEK）、ポリエレ
チンオキサイド、ポリプロピレンオキサイド、ポ
リオキシメチレンなどで代表されるポリエーテル
類、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリ
フツ化ビニリデン、ポリクロロトリフルオロエチ
レンなどで代表されるハロゲン化ポリマー類及び
ポリフエニレンスルフイド（PPS）、ポリスルフ
オン及びそれらの共重合体や変性体などである。
本発明の場合、熱可塑性ポリマーとしては、特
に、ポリエステル類、ポリアミド類、ポリエーテ
ル類、ポリフエニレンスルフイドなどであり、更
にポリエチレンテレフタレート、ポリエチレンナ
フタレート、などのポリエステル類及びポリフエ
ニレンスルフイドは特に本発明の効果が顕著であ
り、好ましい。もちろん、上記ポリマーに公知の
添加剤、例えば安定剤、粘度調製剤、酸化防止
剤、充填剤、滑り剤、帯電防止剤、ブロツキング
防止剤、剥離剤、離型剤などを含有させてもよ
い。
冷却表面上に介在する水の平均液膜厚さｄと、
該溶融重合体シートと冷却表面との接する位置に
形成されるメニスカスの高さｈとは、ｈ＞ｄの関
係でなければならない。すなわち、ｈ≦ｄである
と冷却表面上に生じた水膜の厚さの変動をそのま
まキヤストシートに転写されてしまうので、長時
間安定したキヤストが出来ないのである。ｈ、ｄ
とも、単位は同一でμmで表わすことが多い。平
均液膜の厚さｄは、キヤステイグドラムなどの冷
却表面上に供給する量と、成形されたシートが冷
却表面上から剥離されたのちに冷却表面上に残存
してる液膜の量との加算された値になるが、残存
している液膜の量は巾方向、長手方向とも不均一
でムラのあることが多いので、シートが剥離され
たのち、新たに液を供給されるまでの間に完全に
残存液膜を真空法や吸引ロールなどで吸液除去す
るのがよい。冷却表面に形成された液膜は、結露
法により得られた不連続な水の液膜である必要が
ある。結露法とは、湿気を含んだ空気をその露点
以下に保たれた冷却表面に吹き付けて結露させる
方法をいう。結露法によつて得られる不連続な液
膜は、ｄ値が3μm以下の薄い液膜を形成するとき
に特に有効である。水を塗布する方法では、表面
が平滑な、濡れ張力の小さい鏡面の冷却表面上に
3μm以下の薄い液膜を均一に幅方向に長時間安定
して塗布することは困難である。ｄ値の測定は、
例えば赤外線吸収量より求められる。
次にメニスカスの高さｈは、種々の要因で変わ
り、ポリマーの表面張力、溶融シート表面あらさ
溶融シートの厚さ、液や表面張力、キヤストドラ
ムなどの表面あらさや表面張力、静電印加法など
の他の密着手段による補強密着力、吐出する口金
から、冷却表面までの距離、溶融シートのドラム
への密着する角度などに影響れる。したがつて、
これらのパラメーターを適宜組み合わせることに
よりメニスカスの高さｈを変えることが出来る。
メニスカスの高さｈとは、第１図に示したよう
に、溶融体と冷却表面との接点近傍に出来る液の
表面張力に起因する三日月形の冷却表面からの高
さｈをいう。このｈの測定は、精度がいるため、
一旦フアイバースコープなどで写真にとつたの
ち、これ拡大して求めるのがよい。ｈ値としては
１〜20μm程度が安定したキヤストが得られる。
このようにｈをｄより高くすることによつて、
さらに好ましくは、ｈを2dより高くすることに
よつて、冷却表面上に形成する液は均一厚みでな
くても、また点状のツブツブ状液膜の塗布であつ
ても、溶融シートに転写されることはなく、均一
なキヤストが可能になるのである。
もちろん、必要に応じて、このあと、熱処理や
一軸、二軸延伸してもよいことは明らかである。
〔発明の効果〕
メニスカスの高さｈを、冷却表面上に介在する
水の平均液膜厚さｄより高く、好ましくは2dよ
り高くすることによつて、次のような効果が生じ
る。
(1) 液膜を均一な連続膜に形成しなくても、液膜
の厚みが多少との不均一であつても、あるいは
ひどい時には、小さなピンホールが生成してい
ても、均一なキヤストが可能となり、長期間安
定したキヤストが可能となる。
(2) さらに液膜が連続体でなく点状の液膜であつ
ても、メニスカスの形成により、溶融シートに
は点状の液の転写はなく、均一なキヤストシー
トが得られる。
(3) したがつて親水化ドラムでなくても、公知の
鏡面ドラム上にも液塗布キヤストが可能とな
る。
〔実施例〕
実施例 １
溶融重合体として、ポリエチレンテレフタレー
ト（０−クロルフエノール中での極限粘度［η］
0.65、添加剤としては平均粒径300mμのSiO2を
0.1重量％添加）を用い、常法により180℃で真空
乾燥後、押出機に供給し、285℃で溶融させたの
ち、ギヤーポンプで定量的に計量し、Ｔダイ口金
から一定厚さの溶融シートを吐出させた。該シー
トの全幅にわたつて静電荷を印加させながら、
100m／分で鏡面ドラム（表面あらさ0.2s）上に
は密着冷却固化させた。このとき、鏡面ドラム上
には、80℃の飽和水蒸気を含んだエアーを、25℃
に保たれたドラム上に吹きつけ、平均水膜厚さ
1μmになる様に水滴を点状に均一に付着させてあ
る。このように、平均水膜厚さ1μmの水膜を有す
るドラム上に、静電荷を帯びた厚さ100μmの溶融
シートを密着冷却させ、その接地点にできる水膜
のメニスカスの高さｈを3μmに保つた。
このような状態で１週間キヤストを続けたが、
キヤスト欠点となる様な表面欠点や端部の乱れな
どは全くなく、安定してキヤストができた。
比較例 １
実施例１で用いた静電印加を付与する位置を、
ドラムの円周上で、ドラムの回転方向に移動させ
てメニスカスの高さを変更する。他は全く実施例
１と同様にして厚さ100μmのシートを100m／分
の速度でキヤストした。
[Industrial Field of Application] The present invention relates to a method for casting molten polymer sheets. [Prior Art] As a method of casting a molten polymer sheet, a method of casting while forming a liquid film of water or the like on a cooling surface is known, such as in JP-A-58-63415. [Problems to be Solved by the Invention] However, the above conventional casting method has the following problems. (1) It is extremely difficult to form a uniform continuous film of liquid such as water with a thickness of 10 μm or less on a cooling surface, and uneven thickness of the water film or the presence of a discontinuous film will cause casting defects. (2) In particular, the liquid film such as water should be 2 μm or less, preferably 1 μm.
When it is necessary to make the film as thin as possible, it is not possible to form a uniform continuous film, and casting is virtually impossible. [Means for Solving the Problems] An object of the present invention is to improve the above-mentioned drawbacks and provide a casting method that is fast even when the water film thickness varies and is stable over time. That is, the present invention provides a casting method in which a molten polymer sheet is closely molded on a cooling surface having a discontinuous liquid film of water obtained by a dew condensation method. A method for casting a molten polymer sheet, characterized in that the average liquid film thickness d and the height h of a meniscus formed at a position where the molten polymer sheet contacts a cooling surface satisfy h>d. It is something. The cooling device is a movable device such as a drum-shaped rotating body or a belt, and the cooling surface is one with a well-known mirror chrome plating finish, or if necessary, the surface can be etched or sandblasted. It may be a surface roughened by other means, or a surface coated with a hydrophilic agent,
A mirror finish is preferable in terms of stable castability, reproducibility, and stability over time. A molten polymer is a polymer represented by a thermoplastic polymer, and a thermoplastic polymer is a polymer that exhibits plasticity when heated.
Chemically, it is a linear polymer. Typical polymers include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyethylene α,β-bis(2-chlorophenoxy)ethane 4,4′-dicarboxylate, polymers from P-hexahydro-xylylene terephthalate, Polyesters having an ester bond in the main chain, as typified by polymers from 1,4 cyclohexanedimethanol, poly-P-ethyleneoxybenzoate, polyarylates, polycarbonates, etc., and copolymers thereof;
Furthermore, as represented by nylon 6, nylon 66, nylon 610, nylon 12, nylon 11, etc.
Polyamides having an amide bond in the main chain, polyolefins and polyethers mainly composed of hydrocarbons, such as polyamides, polyethylene, polypropylene, ethylene-vinyl acetate copolymers, polymethylpentene, polybutene, polyisobutylene, polystyrene, etc. Polyethers represented by sulfon (PES), polyphenylene oxide (PPO), polyether ether ketone (PEEK), polyethylene oxide, polypropylene oxide, polyoxymethylene, etc., polyvinyl chloride, polyvinylidene chloride, polyfts These include halogenated polymers such as vinylidene oxide and polychlorotrifluoroethylene, polyphenylene sulfide (PPS), polysulfone, and their copolymers and modified products.
In the case of the present invention, thermoplastic polymers include, in particular, polyesters, polyamides, polyethers, polyphenylene sulfide, etc., and also polyesters such as polyethylene terephthalate, polyethylene naphthalate, and polyphenylene sulfide. The effect of the present invention is particularly remarkable and is therefore preferable. Of course, the above polymer may contain known additives such as stabilizers, viscosity modifiers, antioxidants, fillers, slip agents, antistatic agents, antiblocking agents, release agents, mold release agents, and the like. the average liquid film thickness d of water interposed on the cooling surface;
The height h of the meniscus formed at the position where the molten polymer sheet contacts the cooling surface must satisfy the relationship h>d. That is, if h≦d, the variation in the thickness of the water film generated on the cooling surface will be transferred directly to the cast sheet, making it impossible to cast stably for a long time. h, d
Both have the same unit and are often expressed in μm. The average liquid film thickness d is determined by the amount supplied onto a cooling surface such as a casting drum, and the amount of liquid film remaining on the cooling surface after the formed sheet is peeled off from the cooling surface. However, since the amount of remaining liquid film is often uneven in both the width and length directions, the amount of remaining liquid film is often uneven in both the width and length directions, so after the sheet is peeled off, the amount of remaining liquid film is During this period, it is preferable to completely absorb and remove the remaining liquid film using a vacuum method, a suction roll, or the like. The liquid film formed on the cooling surface needs to be a discontinuous liquid film of water obtained by a dew condensation method. The dew condensation method is a method in which air containing moisture is blown onto a cooling surface that is kept below its dew point to cause condensation. The discontinuous liquid film obtained by the dew condensation method is particularly effective when forming a thin liquid film with a d value of 3 μm or less. In the water application method, the water is applied onto a mirror-like cooling surface with a smooth surface and low wetting tension.
It is difficult to uniformly and stably apply a thin liquid film of 3 μm or less in the width direction for a long time. The measurement of d value is
For example, it can be determined from the amount of infrared absorption. Next, the height h of the meniscus varies depending on various factors, such as the surface tension of the polymer, the surface roughness of the molten sheet, the thickness of the molten sheet, the surface tension of the liquid, the surface roughness and surface tension of the cast drum, etc., and the electrostatic application method. It is influenced by the adhesion force reinforced by other adhesion means, the distance from the discharge nozzle to the cooling surface, the angle at which the molten sheet adheres to the drum, etc. Therefore,
By appropriately combining these parameters, the height h of the meniscus can be changed.
As shown in FIG. 1, the height h of the meniscus refers to the height h from the crescent-shaped cooling surface caused by the surface tension of the liquid formed near the contact point between the molten material and the cooling surface. This measurement of h requires precision, so
It is best to take a photo with a fiberscope and then enlarge it. A stable cast can be obtained with an h value of about 1 to 20 μm. By making h higher than d in this way,
More preferably, by setting h higher than 2d, the liquid formed on the cooling surface can be transferred to the molten sheet even if the thickness is not uniform or even if it is applied as a dotted bubbly liquid film. This makes it possible to cast uniformly. Of course, it is clear that heat treatment or uniaxial or biaxial stretching may be carried out after this, if necessary. [Effects of the Invention] By setting the height h of the meniscus to be higher than the average liquid film thickness d of water present on the cooling surface, preferably higher than 2d, the following effects are produced. (1) Even if the liquid film is not formed into a uniform continuous film, the thickness of the liquid film is slightly uneven, or even if small pinholes are formed in severe cases, a uniform cast can be produced. This enables stable casting over a long period of time. (2) Furthermore, even if the liquid film is not a continuous body but a dotted liquid film, due to the formation of a meniscus, no dotted liquid is transferred to the molten sheet, and a uniform cast sheet can be obtained. (3) Therefore, it is possible to perform liquid coating and casting on a known mirror-surfaced drum instead of a hydrophilized drum. [Example] Example 1 Polyethylene terephthalate (intrinsic viscosity in 0-chlorophenol [η]
0.65, SiO 2 with an average particle size of 300 mμ was used as an additive.
After drying under vacuum at 180℃ using a conventional method, the extruder was fed to an extruder, melted at 285℃, quantitatively measured using a gear pump, and a molten sheet of constant thickness was produced from the T-die nozzle. was discharged. While applying an electrostatic charge across the entire width of the sheet,
It was cooled and solidified in close contact with a mirror-surfaced drum (surface roughness 0.2 seconds) at 100 m/min. At this time, air containing saturated water vapor at 80°C is placed on the mirror drum at 25°C.
Spray onto a drum maintained at an average water film thickness of
Water droplets are uniformly attached in dots so that the size is 1 μm. In this way, a molten sheet with an electrostatic charge of 100 μm thick is cooled in close contact with a drum having a water film with an average water film thickness of 1 μm, and the height h of the meniscus of the water film formed at the grounding point is set to 3 μm. I kept it. I continued to cast in this condition for a week, but
There were no surface defects or disturbances at the edges that would cause casting defects, and the casting was stable. Comparative Example 1 The position where the electrostatic charge applied in Example 1 was changed to
The height of the meniscus is changed by moving it on the circumference of the drum in the direction of rotation of the drum. Otherwise, a sheet having a thickness of 100 μm was cast at a speed of 100 m/min in the same manner as in Example 1.
【表】
このように、メニスカスの高さｈが、冷却表面
上の平均水膜厚さｄよりも低いときは、得られる
キヤストシート表面はツブ状の水の転写という欠
点を有したものしか得られないことがわかる。[Table] As shown above, when the height h of the meniscus is lower than the average water film thickness d on the cooling surface, the resulting cast sheet surface has only the drawback of bulge-like water transfer. I know that I can't.
第１図は本発明の溶融重合体シートのキヤスト
方法を示す冷却装置の断面図である。
１は成形用口金、２は溶融シート、３は冷却成
形されたシート、４は残存した液膜を吸引するロ
ール、５は飽和水蒸気を吹きつける水膜供給装
置、６は冷却装置（ドラム）、７は不均一に残存
した液膜、８は厚さｄに均一に形成された液膜、
である。
FIG. 1 is a sectional view of a cooling device showing the method of casting a molten polymer sheet of the present invention. 1 is a molding die, 2 is a molten sheet, 3 is a cooled and molded sheet, 4 is a roll that sucks the remaining liquid film, 5 is a water film supply device that sprays saturated steam, 6 is a cooling device (drum), 7 is a liquid film that remains unevenly, 8 is a liquid film that is uniformly formed with a thickness of d,
It is.
Claims (1)
た水の不連続液膜を有した冷却表面上にて密着成
形するキヤスト方法において、該冷却表面上に介
在する水の平均液膜厚さｄと、該溶融重合体シー
トと冷却表面との接する位置に形成されるメニス
カスの高さｈとが、ｈ＞ｄであることを特徴とす
る溶融重合体シートのキヤスト方法。1 In a casting method in which a molten polymer sheet is closely molded on a cooling surface having a discontinuous liquid film of water obtained by a dew condensation method, the average liquid film thickness of water interposed on the cooling surface d and the height h of a meniscus formed at a position where the molten polymer sheet contacts a cooling surface, h>d.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63155800A JPH01320130A (en) | 1988-06-23 | 1988-06-23 | Method for casting molten polymer sheet |
| EP89907298A EP0466921B2 (en) | 1988-06-23 | 1989-06-23 | Process for producing polyester film |
| DE68925429T DE68925429T3 (en) | 1988-06-23 | 1989-06-23 | METHOD FOR PRODUCING A POLYESTER FILM |
| KR1019890701853A KR960007293B1 (en) | 1988-06-23 | 1989-06-23 | Process for producing polyester film |
| US07/455,399 US5076976A (en) | 1988-06-23 | 1989-06-23 | Process for producing polyester film |
| PCT/JP1989/000625 WO1989012544A1 (en) | 1988-06-23 | 1989-06-23 | Process for producing polyester film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63155800A JPH01320130A (en) | 1988-06-23 | 1988-06-23 | Method for casting molten polymer sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01320130A JPH01320130A (en) | 1989-12-26 |
| JPH0557093B2 true JPH0557093B2 (en) | 1993-08-23 |
Family
ID=15613721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63155800A Granted JPH01320130A (en) | 1988-06-23 | 1988-06-23 | Method for casting molten polymer sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01320130A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101641044B1 (en) * | 2015-04-03 | 2016-07-29 | 주식회사 서진캠 | Apparatus for assembling of cam shaft and integrated type housing and assembling method using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5544804A (en) * | 1978-09-26 | 1980-03-29 | Teijin Ltd | Preparation for polymer film |
| JPS5835133A (en) * | 1981-08-26 | 1983-03-01 | Taisho Pharmaceut Co Ltd | Preparation of 1-(p-prenylphenyl)ethanol |
-
1988
- 1988-06-23 JP JP63155800A patent/JPH01320130A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5544804A (en) * | 1978-09-26 | 1980-03-29 | Teijin Ltd | Preparation for polymer film |
| JPS5835133A (en) * | 1981-08-26 | 1983-03-01 | Taisho Pharmaceut Co Ltd | Preparation of 1-(p-prenylphenyl)ethanol |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101641044B1 (en) * | 2015-04-03 | 2016-07-29 | 주식회사 서진캠 | Apparatus for assembling of cam shaft and integrated type housing and assembling method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01320130A (en) | 1989-12-26 |
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