JPS6245811B2 - - Google Patents
Info
- Publication number
- JPS6245811B2 JPS6245811B2 JP54009686A JP968679A JPS6245811B2 JP S6245811 B2 JPS6245811 B2 JP S6245811B2 JP 54009686 A JP54009686 A JP 54009686A JP 968679 A JP968679 A JP 968679A JP S6245811 B2 JPS6245811 B2 JP S6245811B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- thin film
- thermoplastic resin
- film
- slit
- 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
Links
- 238000001816 cooling Methods 0.000 claims description 27
- 239000010409 thin film Substances 0.000 claims description 25
- 239000010408 film Substances 0.000 claims description 21
- 229920005992 thermoplastic resin Polymers 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 6
- 230000037303 wrinkles Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
本発明は透明性に優れた良質の熱可塑性樹脂フ
イルムのＴダイ急冷成形方法に関する。
従来熱可塑性樹脂のＴダイ急冷フイルムはその
成形において、水槽法、チルロール法などによつ
て急冷されているが、水槽法では冷却水面の波立
ち、ゆれなどにより溶融薄膜両面の冷却点が安定
せず均一な冷却が困難であり、チルロール法では
引取速度が約40m／min以上の高速成形になると
チルロールと溶融薄膜の間に空気を巻込んだりチ
ルロールと溶融薄膜の密着性が不良となつてし
わ、厚みムラ、溶融薄膜表裏面の冷却差によるカ
ールなどが発生して良質な熱可塑性樹脂フイルム
が得難くあるいは約100μ以上の厚手になると透
明性が低下するという問題があつた。
本発明はこれらの問題を解決するものでありそ
の要旨は、熱可塑性樹脂の薄膜をＴダイから溶融
押出をして垂下させ、該膜の両面から冷却風をあ
て、続いて該両面に等水位の冷却水を接触させる
熱可塑性樹脂フイルムの成形方法において、上記
垂下する薄膜は上記冷却風によりフロストライン
が生じない程度まで冷却され、続いて冷却装置の
スリツト内に導かれ、該スリツト内に供給される
水であつてその入口より下位の部分に水面を有し
つつ流下する冷却水に接触させる熱可塑性樹脂フ
イルムの成形方法にある。
以下に本発明を図面を用いて説明する。第１図
は本発明の工程を示す断面図であるが、押出機
（図示せず）と連通するＴダイ１の押出口から熱
可塑性樹脂の薄膜２を溶融押出し、直ちに薄膜両
面にエアーナイフ３，３′により冷却風を当てて
薄膜の温度をゆるやかに低下させ、次いで冷却装
置４のスリツト５に垂下しそのスリツト５内で流
入口６，６′から冷却液７，７′を供給しつつ薄膜
２をはさむ冷却液７，７′の液面７ａ，７a′の液
位を等しくしながら冷却液７，７′を流下させて
薄膜２を急冷する。なお冷却液７，７′は水でよ
く冷却液溜り８，８′を設けると薄膜２と冷却液
７，７′とが均一に接触するので好ましい。
本発明においてはＴダイから溶融押出した熱可
塑性樹脂の薄膜をたとえばエアーナイフにより薄
膜両面にフロストラインを発生しない程度にして
後述する冷却液による急冷効果を出すようにして
冷却風を当てることが必要であり、この工程を欠
くと薄膜のサージング、切断などを生じて安定し
た成形が困難となる。なお冷却風の温度は常温付
近でよい。
またスリツト内で薄膜をはさむ冷却液の液位を
等しくしないとフイルムにカールを生じてその除
去が面倒となる。冷却液の液位が等しいとは透明
壁を介して肉眼観察により認められる程度でよ
い。本発明においては冷却装置の狭いスリツト内
なので冷却液の液位の安定が容易であるが、従来
の水槽法では冷却水面の波立ち、ゆれなどが避け
難く溶融薄膜両面の冷却点が安定せず均一な冷却
が困難であつた。
本発明においては薄膜両面をはさんで冷却液が
流下するので高い冷却効果を奏し均一に冷却され
て透明性に優れたカールのない熱可塑性樹脂フイ
ルムが得られる。しかも約40m／min以上の高速
引取の場合にも本発明は適用されるが、従来のチ
ルロール法ではかかる高速成形になるとチルロー
ルと溶融薄膜の間に空気を巻込んだりチルロール
と溶融薄膜の密着性が不良となつてしわ、厚みム
ラ、溶融薄膜表裏面の冷却差によるカール、急冷
不十分による透明性低下などが発生する欠点があ
つた。
さらに本発明の効果として薄手は勿論100〜200
μの厚手の透明性に優れた熱可塑性樹脂フイルム
の成形にも適することが挙げられる。本発明にお
いては冷却液の液位を安定させ易く薄膜両面での
冷却液流下による強い急冷のため優れた透明性が
得られ、カール、しわ、厚みムラなどは発生しな
いのであるが、従来の水槽法では急冷不十分や水
面の波立ち、ゆれによる透明性低下、しわ、厚み
ムラなどが発生するし、チルロール法では急冷不
十分による透明性低下が発生する。
なお本発明の冷却装置のスリツト間隔は熱可塑
性樹脂フイルム厚みの20〜100倍位でよい。また
本発明は熱可塑性樹脂の中でもチルロール法で前
記空気巻込や密着性不良の問題を起し易いこしの
強い高密度ポリエチレンのフイルム成形において
その問題解決に大いに寄与するものである。
以上述べるように本発明は、成形における均一
且つ強い急冷、高速成形、フイルムにおける優れ
た透明性賦与、しわ、厚みムラの解消など数々の
効果を有する。
以下に実施例、比較例を挙げて本発明をさらに
詳細に説明する。
実施例１〜７、比較例１〜７
第１表に示す各種原料樹脂を用いてＴダイ急冷
フイルムを成形したが、その結果も第１表にあわ
せて示す。なお下記成形条件は各実施例、比較例
において共通である。
押出機 ；65m/mφ、Ｌ／Ｄ＝28
スクリユウ ；メタリングタイプ
Ｔダイ ；マニホールドタイプ
巾 600mm
スリツト １mm
冷却液 ；水 20℃
The present invention relates to a T-die rapid cooling molding method for a high-quality thermoplastic resin film with excellent transparency. Conventionally, T-die quenched films made of thermoplastic resin are quenched by a water bath method, a chill roll method, etc. during molding, but with the water bath method, the cooling point on both sides of the molten thin film is unstable due to ripples and swaying of the cooling water surface. Uniform cooling is difficult, and with the chill roll method, when forming at high speeds with take-up speeds of approximately 40 m/min or higher, air may be drawn in between the chill roll and the molten film, resulting in poor adhesion between the chill roll and the molten film, resulting in wrinkles and wrinkles. There were problems in that it was difficult to obtain a high-quality thermoplastic resin film due to thickness unevenness and curling due to cooling differences between the front and back surfaces of the molten thin film, and that transparency decreased when the film was thicker than about 100 μm. The present invention solves these problems, and its gist is to melt-extrude a thin film of thermoplastic resin from a T-die and let it hang down, apply cooling air to both sides of the film, and then apply equal water level to both sides. In the method for molding a thermoplastic resin film in which cooling water is brought into contact with the thin film, the hanging thin film is cooled by the cooling air to an extent that no frost line is generated, and then guided into a slit of a cooling device and supplied into the slit. The present invention provides a method for molding a thermoplastic resin film which is brought into contact with flowing cooling water having a water surface below the inlet thereof. The present invention will be explained below using the drawings. FIG. 1 is a sectional view showing the process of the present invention. A thermoplastic resin thin film 2 is melted and extruded from the extrusion port of a T-die 1 communicating with an extruder (not shown), and an air knife 3 is immediately applied to both sides of the thin film. , 3' to gradually lower the temperature of the thin film, and then the thin film is suspended into the slit 5 of the cooling device 4, and cooling fluid 7, 7' is supplied from the inlets 6, 6' within the slit 5. The thin film 2 is rapidly cooled by flowing down the cooling liquids 7, 7' while equalizing the liquid levels 7a, 7a' of the cooling liquids 7, 7' sandwiching the thin film 2. The cooling liquids 7, 7' may be water, and it is preferable to provide cooling liquid reservoirs 8, 8' so that the thin film 2 and the cooling liquids 7, 7' come into uniform contact. In the present invention, it is necessary to apply cooling air to the thin film of thermoplastic resin melted and extruded from a T-die by using an air knife, for example, to the extent that frost lines do not occur on both sides of the thin film, so as to produce a rapid cooling effect using a cooling liquid, which will be described later. If this step is missing, surging or cutting of the thin film will occur, making stable molding difficult. Note that the temperature of the cooling air may be around room temperature. Furthermore, if the liquid level of the cooling liquid sandwiching the thin film within the slit is not equalized, the film will curl and its removal will be troublesome. The liquid level of the cooling liquid may be equal to the extent that it can be observed by naked eye observation through the transparent wall. In the present invention, it is easy to stabilize the level of the cooling liquid because it is within the narrow slit of the cooling device, but in the conventional water tank method, it is difficult to avoid ripples and fluctuations in the cooling water surface, and the cooling point on both sides of the molten thin film is not stable and uniform. Cooling was difficult. In the present invention, since the cooling liquid flows down both sides of the thin film, a high cooling effect is achieved, and a thermoplastic resin film with excellent transparency and no curling can be obtained by being uniformly cooled. Moreover, the present invention is also applicable to high-speed take-up of approximately 40 m/min or more, but in the conventional chill roll method, such high-speed forming causes air to be drawn in between the chill roll and the molten thin film, and the adhesion between the chill roll and the molten thin film. There were drawbacks such as wrinkles, uneven thickness, curling due to differences in cooling between the front and back surfaces of the molten thin film, and decreased transparency due to insufficient rapid cooling. Furthermore, as an effect of the present invention, it is possible to reduce the thickness by 100~200 mm.
It is also suitable for molding thick thermoplastic resin films with excellent transparency. In the present invention, the liquid level of the coolant is easily stabilized, and excellent transparency is obtained due to the strong rapid cooling caused by the coolant flowing down on both sides of the thin film, and curls, wrinkles, and uneven thickness do not occur. In the case of the chill roll method, a decrease in transparency occurs due to insufficient quenching and ripples and shaking of the water surface, as well as wrinkles and uneven thickness, while in the chill roll method, a decrease in transparency occurs due to insufficient quenching. The slit spacing of the cooling device of the present invention may be about 20 to 100 times the thickness of the thermoplastic resin film. Furthermore, the present invention greatly contributes to solving problems in film molding of stiff high-density polyethylene, which is a thermoplastic resin and which tends to cause the problems of air entrainment and poor adhesion in the chill roll method. As described above, the present invention has a number of effects such as uniform and strong quenching during molding, high-speed molding, imparting excellent transparency to the film, and eliminating wrinkles and thickness unevenness. The present invention will be explained in more detail by giving Examples and Comparative Examples below. Examples 1 to 7, Comparative Examples 1 to 7 T-die quenched films were molded using the various raw material resins shown in Table 1, and the results are also shown in Table 1. The following molding conditions are common to each Example and Comparative Example. Extruder: 65m/mφ, L/D=28 Screw: Metering type T-die: Manifold type Width: 600mm Slit: 1mm Coolant: Water: 20℃
【表】【table】
【表】
本発明の実施例を比較例と対比させると、透明
性（Haze）に優れ良質の熱可塑性樹脂フイルム
が得られることが明らかである。[Table] When the Examples of the present invention are compared with the Comparative Examples, it is clear that thermoplastic resin films with excellent transparency (haze) and good quality can be obtained.
第１図は本発明の成形方法を示す工程断面図で
ある。
１…Ｔダイ、２…薄膜、３，３′…エアーナイ
フ、４…冷却装置、５…スリツト、６，６′…流
入口、７，７′…冷却液、７ａ，７′ａ…冷却液の
液面、８，８′…冷却液溜り部。
FIG. 1 is a process sectional view showing the molding method of the present invention. 1... T-die, 2... Thin film, 3, 3'... Air knife, 4... Cooling device, 5... Slit, 6, 6'... Inlet, 7, 7'... Cooling liquid, 7a, 7'a... Cooling liquid liquid level, 8, 8'...cooling liquid reservoir.
Claims (1)
して垂下させ、該膜の両面から冷却風をあて、続
いて該両面に等水位の冷却水を接触させる熱可塑
性樹脂フイルムの成形方法において、上記垂下す
る薄膜は上記冷却風により、フロストラインが生
じない程度まで冷却され続いて冷却装置のスリツ
ト内に導かれ、該スリツト内に供給される水であ
つてその入口より下位の部分に水面を有しつつ流
下する冷却水に接触させることを特徴とする熱可
塑性樹脂フイルムの成形方法。1. A method for forming a thermoplastic resin film in which a thin film of thermoplastic resin is melt-extruded from a T-die and suspended, cooling air is applied to both sides of the film, and then cooling water at an equal level is brought into contact with both sides, The hanging thin film is cooled by the cooling air to such an extent that no frost line is generated, and then guided into the slit of the cooling device, and the water supplied into the slit is lowered from the inlet to the water surface. 1. A method for molding a thermoplastic resin film, which comprises contacting the thermoplastic resin film with flowing cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP968679A JPS55105532A (en) | 1979-02-01 | 1979-02-01 | Molding method for thermoplastic resin film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP968679A JPS55105532A (en) | 1979-02-01 | 1979-02-01 | Molding method for thermoplastic resin film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55105532A JPS55105532A (en) | 1980-08-13 |
| JPS6245811B2 true JPS6245811B2 (en) | 1987-09-29 |
Family
ID=11727086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP968679A Granted JPS55105532A (en) | 1979-02-01 | 1979-02-01 | Molding method for thermoplastic resin film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55105532A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58142818A (en) * | 1982-02-19 | 1983-08-25 | Idemitsu Petrochem Co Ltd | Manufacture of polypropylene sheet |
| JPS5929124A (en) * | 1982-08-09 | 1984-02-16 | Showa Denko Kk | Apparatus for molding thermoplastic resin film |
| JPS5929125A (en) * | 1982-08-09 | 1984-02-16 | Showa Denko Kk | Method for molding thermoplastic resin film |
| US4548778A (en) * | 1983-09-26 | 1985-10-22 | Idemitsu Petrochemical Co., Ltd. | Method of producing thermoplastic resin sheet or film |
| JPS61142138A (en) * | 1984-11-29 | 1986-06-30 | 出光石油化学株式会社 | Bending vessel |
| JP4913354B2 (en) * | 2005-03-29 | 2012-04-11 | 鹿島建設株式会社 | Gravel unloading device and gravel unloading method |
-
1979
- 1979-02-01 JP JP968679A patent/JPS55105532A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55105532A (en) | 1980-08-13 |
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