JPH0348852B2 - - Google Patents

Info

Publication number
JPH0348852B2
JPH0348852B2 JP14442083A JP14442083A JPH0348852B2 JP H0348852 B2 JPH0348852 B2 JP H0348852B2 JP 14442083 A JP14442083 A JP 14442083A JP 14442083 A JP14442083 A JP 14442083A JP H0348852 B2 JPH0348852 B2 JP H0348852B2
Authority
JP
Japan
Prior art keywords
die
film
air knife
air
synthetic 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
Application number
JP14442083A
Other languages
Japanese (ja)
Other versions
JPS6036123A (en
Inventor
Minoru Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Placo Co Ltd
Original Assignee
Placo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Placo Co Ltd filed Critical Placo Co Ltd
Priority to JP58144420A priority Critical patent/JPS6036123A/en
Publication of JPS6036123A publication Critical patent/JPS6036123A/en
Publication of JPH0348852B2 publication Critical patent/JPH0348852B2/ja
Granted legal-status Critical Current

Links

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
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/917—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means by applying pressurised gas to the surface of 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】 （産業上の利用分野） この発明は、Ｔダイを利用して、熱可塑性合成
樹脂フイルムを高速成形する成形機に関する。 （従来の技術） この種の薄膜高速成形方法及び成形機として、
Ｔダイ１０から押出成形された溶融膜Ｂを、Ｔダ
イ１０に接近して設けた回転中の冷却ロール１１
に、一段又は多段のエアナイフ１２（又は１２
ａ）の吹出口１３から吹出される冷風圧により密
着させ、かつ冷却させて、所定厚みのフイルムＦ
とする成形方法、成形機が先行技術として存在す
る（第１図、第２図参照）。 更に、エアナイフ１２の構造を改良することに
より、成形フイルムの厚味を均等化することを目
的として、特公昭51−31265号、特公昭51−33144
号、特公昭53−20549号の各公報に示す高速成形
方法、成形機が開発されている。 （発明が解決しようとする課題） 然るに、前記全ての従来技術においては、Ｔダ
イ１０から押出された溶融膜B0は、冷却ロール
１１の回転により引き落されると共に重力の加速
度を受け、Ｔダイ１０からエアナイフ１２に至る
間（通常25〜70mm程度）において外気に曝され不
安定な状態にあり、厚物フイルムの成形時には、
引落率（冷却ロールの周速度／Ｔダイ１０の押出
し速度）が小さくなり、Ｔダイ１０からエアナイ
フ１２に至る間の溶融膜B0に加わるテンシヨン
が小さくなる一方、薄物フイルムの成形時には、
このテンシヨンが大きくなり、引落率が増大し、
高速度で落下し、外気を冷却ロール１１と溶融膜
間に随伴引込み、Ｔダイ１０のスリツト１０ａか
らエアナイフ１２に至る溶融膜B0が冷却ロール
１１の周面に対して小刻みな振動を起こし、いわ
ゆるバタ付き、エアナイフ１２からの冷風圧によ
る冷却ロール１１と溶融膜B0との接触（密着）
が全幅に亘り均一とならず、冷却固化が一様に進
行せず溶融膜B0の表面にしわ、たるみが生じ、
フイルムの成形安定性が不良となり、得られたフ
イルムの肉厚が偏肉となり、透明度、光沢度が落
ちると共に、Ｔダイ１０とエアナイフ１２間の溶
融膜B0の幅方向への振れが大きくなり、耳スリ
ツトロスが増加し、フイルムＦの製造コストを押
上げている。 この発明は、前記従来技術の欠点を改良し、Ｔ
ダイのスリツトからエアナイフに至る溶融膜を強
制的に加圧下におき、この区間での溶融膜の厚み
方向及び幅方向への振れを抑制、解消し、安定し
た状態で冷却ロール周面にＴダイから溶融膜を押
出し落下させ、外気とほとんど振れることなくエ
アナイフの吹出口前面へ溶融膜を冷却ロール周面
に沿い移動させ、均一厚さ、所望透明度、光沢度
のフイルムを高速成形する成形機を提供すること
を主目的とする。 （課題を解決するための手段） 前記課題を達成するため、この発明はＴダイの
スリツトから押出し成形された熱可塑性合成樹脂
の溶融膜を、前記Ｔダイに接近して設けた回転中
の冷却ロール周面に、一段乃至多段のエアナイフ
の吹出口から吹出される冷風圧により密着させ、
かつ冷却させて、所定厚さのフイルムとする熱可
塑性合成樹脂フイルムの高速成形機において、 前記Ｔダイのスリツトと前記エアナイフの吹出
口間の溶融膜上面を外気とほゞ遮断した状態で取
り囲む覆い体が、前記Ｔダイと前記エアナイフ間
の間隔変化に追従し伸縮自在としてあることを特
徴とする熱可塑性合成樹脂フイルムの高速成形機
である。 （作用） 前記のように構成したこの発明の作用は次の通
りである。 先ず、Ｔダイによるフイルムの成形は公知と同
様であり、ここでの説明は省略する。この発明特
有の作用は次の通りである。 熱可塑性合成樹脂の溶融物をＴダイのスリツト
から押出し溶融膜を形成し、回転中の冷却ロール
周面に接触させる時に、一段乃至多段のエアナイ
フの吹出口から吹出される冷風圧によりこの溶融
膜を前記冷却ロール周面に密着させ、かつ冷却さ
せて、所定厚さのフイルムとする熱可塑性合成樹
脂膜の高速成形方法において、 前記冷却ローラ周面に極接近して設けた前記Ｔ
ダイのスリツトから前記エアナイフの吹出口に至
る溶融膜上に外気とほゞ遮断された加圧室が形成
され、加圧下でＴダイからエアナイフへ前記溶融
膜が移動させられる。 （実施例） 次に、本件装置発明の代表的実施例を第３図乃
至第５図に基づき説明する。 第３図において、２０はＴダイであり、このＴ
ダイ２０に接近して冷却ロール２１が機枠に軸線
を水平として回転可能に設けられている。 このＴダイ２０のスリツト２０ａから押出され
た溶融膜Ｂを回転中の冷却ロール２１周面に密着
させる一段のエアナイフ２２がＴダイ２０のスリ
ツト２０ａから冷却ロール２１の回転方向へ所定
寸法（20〜70mm）離れて、その冷風吹き出し口２
３を冷却ロール２１周面に向けて、配置されてい
る。 前記Ｔダイ２０のスリツト２０ａとエアナイフ
２２の吹出口２３の間にＴダイ２０とエアナイフ
２２の間隔変化に応じ伸縮自在の覆い体２４が、
張設してあり、蛇腹状の軟質合成樹脂製としてあ
る。 この覆い体２４は上壁２５と、この壁２５によ
り相互連結された左右一対の側壁２６からなり、
その底面は冷却ロール２１の周面に向け開口して
おり、上壁２５は溶融膜B0の幅方向に延在し、
その上端２５ａは、Ｔダイ２１の下面にエアシー
ル状態で連結され、その下端２５ｂはエアナイフ
２２の上面にエアシール状態で連結し、この上壁
２５の両側縁から冷却ロール２１周面に向け延在
する前記各側壁２６の下端縁２６ａは、前記冷却
ロール２１周面に密接し（第５図参照）、これら
上壁２５と両側壁２６により、前記Ｔダイ２０の
スリツト２０ａとエアナイフ２２の前記吹出口２
３間の溶融膜B0の上面が外気とほゞ遮断した状
態で取り囲まれ、この際、上壁２５の上端２５ａ
はＴダイ下面で密閉させ、下端２５ｂ側は、エア
ナイフ２２の上面でほゞ密閉され、エアナイフ２
２の前記吹出口２３と冷却ロール２１周面間に形
成される間〓２７のみで、外気と覆い体２４内部
が連通する状態となる。 この実施例の作用は次の通りである。 前記のように構成した実施例の作用は次の通り
である。 前記Ｔダイ２０のスリツト２０ａから押し出さ
れた溶融膜Ｂは、冷却ロール２１の回転速度とＴ
ダイ２０からの溶融膜の押出し速度の相対速度差
に応じ、覆い体２４側へ引かれるようにして冷却
ロール２１周面上へ落下させ、覆い体ないを通
り、エアナイフの吹出口２３前面において、この
吹出口２３から吹出される冷風の圧力により回転
中の冷却ロール２１周面にこの溶融膜Ｂを密着か
つ冷却させ、所定厚さのフイルムＦを高速成形す
る。 この際エアナイフ２２の吹出口２３から吹出し
た冷風の一部は、前記間〓２７から覆い体２４内
に導かれ、覆い体２４内の圧力が上昇し、Ｔダイ
２０のスリツト２０ａからエアナイフ２２の吹出
口２３に至る間の溶融膜B0の上に外気とほゞ遮
断された加圧室Ｐが形成され、加圧下でこの間の
溶融膜B0は、振動を伴わずに移動し、肉厚の一
様な光学的特性の良好なフイルムＦが高速成形さ
せる。 成形すべきフイルムの厚みの種類に応じてＴダ
イ２０とエアナイフ２２の間隔を調整すると、前
記覆い体２４は、その調整量に見合う分だけ伸縮
し、常に適正な加圧室Ｐを前記溶融膜B0上に形
成する。 （発明の効果） 前記のように構成し作用する本件発明において
は、前記加圧室Ｐの形成により、まだ固化せず溶
融状態にあるＴダイ２０からエアナイフ２２に至
る間の溶融膜B0を加圧状態で移動させ、溶融膜
B0を冷却ロール２１周面に向け押圧すると共に、
幅方向への振れを加圧空気により阻止し、その厚
み方向に振動や、浮き上がりを防止した状態で、
エアナイフ２２の吹出口２３近傍の冷却ロール２
１周面上にこの溶融膜B0を導くことができ、こ
の結果、エアナイフ２２の吹出口２３から吹出さ
れる冷風圧により溶融膜Ｂを全幅に亘り一様に冷
却ロール２１周面上に密着させ、冷却することが
でき、高速成形されたフイルムＦの肉厚を均一化
でき、透明度、光沢度などの光学的性質を向上さ
せることができる。 更に、前記覆い体２４は、Ｔダイ２０とエアナ
イフ２２間の間隔変化に追従して伸縮するため、
常に前記加圧室ＰをＴダイ２０とエアナイフ２２
間の溶融膜B0上に形成することができ、常時均
一厚さの、光学特性のよいフイルムＦを成形でき
る。 なお、前記説明では、エアナイフ２２は、１段
としたが、多段としてもこの発明としては同一で
あり、Ｔダイ２０のスリツト２０ａを出た溶融膜
B0の裏面をも覆い体で覆うこともある。 （実施冷固有の効果） 前記のように覆い体２４を蛇腹状の軟質合成樹
脂製としたものにおいては、覆い体２４を良好に
伸縮することができると共に、第３図乃至第５図
に示すように上壁２５と両側壁２６からなる覆い
体２４においては、覆い体２４の内部と外部との
連通は、エアナイフ２２の吹出口２３と冷却ロー
ル２１周面との間〓２７のみとなり、Ｔダイ２０
とエアナイフ２２間に位置する溶融膜B0は、厚
み方向、幅方向において外気と遮断され、加圧空
気により冷却ロール２１側へ押圧され、かつ幅方
向においてもその動きを効果的に抑制され、良り
均一な肉厚のフイルムＦを得ることができる。 （実施例） 直径90mmのＴダイで、ポリプロピレン合成樹脂
を単位時間当り132Kg押出し、厚さ0.02mm×長さ
1500mmのフイルムに一段のエアナイフのみを使用
した従来の成形方法と、本件発明の覆い体２４を
利用した成形方法で成形加工し、その結果得られ
たフイルムの偏肉度、光学的性質は、次表の通り
である。 【表】DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding machine that molds a thermoplastic synthetic resin film at high speed using a T-die. (Prior art) As this kind of high-speed thin film forming method and forming machine,
The molten film B extruded from the T-die 10 is transferred to a rotating cooling roll 11 provided close to the T-die 10.
, a single or multi-stage air knife 12 (or 12
The film F of a predetermined thickness is made into close contact with and cooled by the cold air pressure blown out from the air outlet 13 in a).
A molding method and a molding machine exist as prior art (see FIGS. 1 and 2). Furthermore, with the aim of equalizing the thickness of the formed film by improving the structure of the air knife 12, Japanese Patent Publication No. 51-31265 and Japanese Patent Publication No. 51-33144 were published.
High-speed molding methods and molding machines have been developed as shown in Japanese Patent Publication No. 53-20549. (Problems to be Solved by the Invention) However, in all of the above-mentioned conventional techniques, the molten film B 0 extruded from the T-die 10 is pulled down by the rotation of the cooling roll 11 and is subjected to gravitational acceleration, The area between the die 10 and the air knife 12 (usually about 25 to 70 mm) is exposed to the outside air and is in an unstable state, and when forming thick films,
The drawdown rate (peripheral speed of the cooling roll/extrusion speed of the T-die 10) becomes smaller, and the tension applied to the molten film B 0 between the T-die 10 and the air knife 12 becomes smaller, but when forming a thin film,
This tension increases, the withdrawal rate increases,
The molten film B0 falls at a high speed, draws outside air between the cooling roll 11 and the molten film, and the molten film B0 from the slit 10a of the T-die 10 to the air knife 12 causes small vibrations against the circumferential surface of the cooling roll 11. So-called flapping, contact (close contact) between the cooling roll 11 and the molten film B 0 due to cold air pressure from the air knife 12
is not uniform over the entire width, and cooling and solidification do not proceed uniformly, causing wrinkles and sagging on the surface of the molten film B0 .
The molding stability of the film becomes poor, the thickness of the obtained film becomes uneven, the transparency and gloss are reduced, and the molten film B 0 between the T-die 10 and the air knife 12 is deflected in the width direction. , the slit loss increases, pushing up the manufacturing cost of film F. This invention improves the drawbacks of the prior art and T.
The molten film from the slit of the die to the air knife is forcibly placed under pressure, suppressing and eliminating vibrations of the molten film in the thickness direction and width direction in this section, and in a stable state, the T-die is attached to the cooling roll circumferential surface. A molding machine that extrudes the molten film from the air, causes it to fall, and moves the molten film along the circumference of the cooling roll to the front of the air knife outlet without shaking with the outside air, forming a film of uniform thickness, desired transparency, and gloss at high speed. The main purpose is to provide (Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention provides a method for cooling a molten film of a thermoplastic synthetic resin extruded from a slit of a T-die by cooling it during rotation by providing a molten film close to the T-die. It is brought into close contact with the circumferential surface of the roll by the pressure of cold air blown out from the outlet of one or more stages of air knives.
In a high-speed molding machine for thermoplastic synthetic resin film which is cooled to form a film of a predetermined thickness, a cover surrounds the upper surface of the molten film between the slit of the T-die and the outlet of the air knife in a state substantially shielded from outside air. This is a high-speed molding machine for thermoplastic synthetic resin film, characterized in that the body is expandable and retractable to follow changes in the distance between the T-die and the air knife. (Function) The function of the present invention configured as described above is as follows. First, the forming of the film using the T-die is the same as that known in the art, and the explanation here will be omitted. The unique effects of this invention are as follows. A molten film is formed by extruding a molten thermoplastic synthetic resin through the slit of a T-die, and when the molten film is brought into contact with the circumferential surface of a rotating cooling roll, the molten film is extruded by the pressure of cold air blown out from the outlet of one or more stages of air knives. In a method for high-speed forming of a thermoplastic synthetic resin film in which a film of a predetermined thickness is formed by closely contacting the circumferential surface of the cooling roller and cooling the T, the T is provided very close to the circumferential surface of the cooling roller.
A pressurized chamber that is substantially isolated from the outside air is formed above the molten film extending from the slit of the die to the outlet of the air knife, and the molten film is moved from the T-die to the air knife under pressure. (Example) Next, a typical example of the present device invention will be described based on FIGS. 3 to 5. In FIG. 3, 20 is a T-die, and this T-die
Close to the die 20, a cooling roll 21 is rotatably provided on the machine frame with its axis horizontal. A one-stage air knife 22 that brings the molten film B extruded from the slit 20a of the T-die 20 into close contact with the circumferential surface of the rotating cooling roll 21 is moved from the slit 20a of the T-die 20 to the rotational direction of the cooling roll 21 by a predetermined dimension (20~ 70mm) away from its cold air outlet 2
3 facing the circumferential surface of the cooling roll 21. Between the slit 20a of the T-die 20 and the air outlet 23 of the air knife 22, there is a cover 24 that can be expanded and contracted according to the change in the distance between the T-die 20 and the air knife 22.
It is made of soft synthetic resin and has a bellows shape. This cover body 24 consists of an upper wall 25 and a pair of left and right side walls 26 interconnected by this wall 25,
The bottom surface thereof is open toward the circumferential surface of the cooling roll 21, and the upper wall 25 extends in the width direction of the molten film B0 ,
Its upper end 25a is connected to the lower surface of the T-die 21 in an air-sealed state, and its lower end 25b is connected to the upper surface of the air knife 22 in an air-sealed state, and extends from both side edges of this upper wall 25 toward the circumferential surface of the cooling roll 21. The lower edge 26a of each side wall 26 is in close contact with the circumferential surface of the cooling roll 21 (see FIG. 5), and the upper wall 25 and both side walls 26 form the slit 20a of the T-die 20 and the air outlet of the air knife 22. 2
The upper surface of the molten film B 0 between 3 and 3 is surrounded in a state where it is almost cut off from the outside air, and at this time, the upper end 25a of the upper wall 25
is sealed on the lower surface of the T-die, and the lower end 25b side is almost sealed on the upper surface of the air knife 22, and the air knife 2
The outside air and the inside of the cover body 24 are in communication only through the gap 27 formed between the second blower outlet 23 and the circumferential surface of the cooling roll 21. The operation of this embodiment is as follows. The operation of the embodiment configured as described above is as follows. The molten film B extruded from the slit 20a of the T-die 20 is
Depending on the relative velocity difference in the extrusion speed of the molten film from the die 20, it is pulled toward the cover 24 and falls onto the circumferential surface of the cooling roll 21, passes through the cover, and is placed in front of the air outlet 23 of the air knife. The molten film B is brought into close contact with the circumferential surface of the rotating cooling roll 21 and cooled by the pressure of the cold air blown out from the air outlet 23, thereby forming a film F of a predetermined thickness at high speed. At this time, a part of the cold air blown from the air outlet 23 of the air knife 22 is guided into the cover body 24 from the gap 27, the pressure inside the cover body 24 increases, and the air knife 22 is released from the slit 20a of the T-die 20. A pressurized chamber P that is almost isolated from the outside air is formed above the molten film B 0 up to the blow-off port 23, and under pressure, the molten film B 0 in this space moves without vibration, and the thickness of the molten film B 0 decreases. The film F with good uniform optical properties enables high-speed molding. When the distance between the T-die 20 and the air knife 22 is adjusted depending on the thickness of the film to be formed, the cover body 24 expands and contracts by the amount corresponding to the adjustment amount, and always maintains an appropriate pressure chamber P for the molten film. Form on B 0 . (Effects of the Invention) In the present invention configured and operated as described above, by forming the pressurizing chamber P, the molten film B 0 between the T-die 20 and the air knife 22, which is not yet solidified and is in a molten state, is Move under pressure to melt the film
While pressing B 0 toward the circumferential surface of the cooling roll 21,
Pressurized air prevents vibration in the width direction, and prevents vibration and lifting in the thickness direction.
Cooling roll 2 near the air outlet 23 of the air knife 22
This molten film B 0 can be guided onto one circumferential surface, and as a result, the molten film B is uniformly adhered to the circumferential surface of the cooling roll 21 over the entire width by the cold air pressure blown out from the outlet 23 of the air knife 22. The thickness of the film F formed at high speed can be made uniform, and the optical properties such as transparency and gloss can be improved. Furthermore, since the cover body 24 expands and contracts in accordance with the change in the distance between the T-die 20 and the air knife 22,
The pressurized chamber P is always connected to the T-die 20 and the air knife 22.
The film F can be formed on the molten film B0 between the two layers, and a film F having a uniform thickness and good optical properties can be formed at all times. In the above description, the air knife 22 has one stage, but the present invention is the same even if the air knife 22 has multiple stages.
The back side of B 0 may also be covered with the body. (Effects Unique to Cooling) In the case where the cover body 24 is made of a bellows-shaped soft synthetic resin as described above, the cover body 24 can be expanded and contracted well, and as shown in FIGS. 3 to 5. In the cover body 24 consisting of the upper wall 25 and both side walls 26, the only communication between the inside and the outside of the cover body 24 is between the outlet 23 of the air knife 22 and the circumferential surface of the cooling roll 21, and T die 20
The molten film B 0 located between the air knife 22 and the air knife 22 is isolated from the outside air in the thickness direction and the width direction, is pressed toward the cooling roll 21 side by the pressurized air, and its movement is effectively suppressed in the width direction as well. A film F having a good uniform thickness can be obtained. (Example) A T-die with a diameter of 90 mm extrudes 132 kg of polypropylene synthetic resin per unit time, thickness 0.02 mm x length
A 1500 mm film was molded using a conventional molding method using only a single air knife and a molding method using the cover 24 of the present invention, and the thickness unevenness and optical properties of the resulting film were as follows. As shown in the table. 【table】

【図面の簡単な説明】[Brief explanation of drawings]

図は、この発明に係るもので、第１図、第２図
は公知例、第３図は、本件発明の代表的実施例の
概略一部破談側面図、第４図は、その覆い体の取
付け状態を示す第３図４−４矢視図、及び第５図
は冷却ロールと覆い体側壁下端縁の関係を示す概
略側面図である。 図中の主な記号の説明、２０……Ｔダイ、２１
……冷却ロール、２２……エアナイフ、２４……
覆い体。 The figures relate to this invention; FIGS. 1 and 2 are known examples, FIG. 3 is a schematic partially broken side view of a typical embodiment of the present invention, and FIG. 4 is a cover of the cover. FIG. 3 is a view in the direction of arrows 4-4 showing the installed state, and FIG. 5 is a schematic side view showing the relationship between the cooling roll and the lower end edge of the cover side wall. Explanation of main symbols in the diagram, 20...T die, 21
...Cooling roll, 22...Air knife, 24...
cover body.

Claims (1)

【特許請求の範囲】 １ Ｔダイのスリツトから押出し成形された熱可
塑性合成樹脂の溶融膜を、前記Ｔダイに接近して
設けた回転中の冷却ロール周面に、一段乃至多段
のエアナイフの吹出口から吹出される冷風圧によ
り密着させ、かつ冷却させて、所定厚さのフイル
ムとする熱可塑性合成樹脂フイルムの高速成形機
において、 前記Ｔダイのスリツトと前記エアナイフの吹出
口間の溶融膜上面を外気とほゞ遮断した状態で取
り囲む覆い体が、前記Ｔダイと前記エアナイフ間
の間隔変化に追従し、伸縮自在としてあることを
特徴とする熱可塑性合成樹脂フイルムの高速成形
機。 ２ 前記覆い体は、溶融膜幅方向に延在し、上端
寄りで前記Ｔダイ下面に連結され、下端寄りで前
記エアナイフ上面に連結された上壁と、この上壁
により相互連結された左右一対の側壁からなり、
両側壁の下端縁は前記冷却ロール周面にほゞ密接
し、その底面は冷却ロールの周面に向け開口して
おり、蛇腹状の軟質合成樹脂製としてあることを
特徴とする特許請求の範囲第１項記載の熱可塑性
合成樹脂フイルムの高速成形機。[Claims] 1. A molten film of thermoplastic synthetic resin extruded from the slit of a T-die is blown onto the circumferential surface of a rotating cooling roll provided close to the T-die using one or more air knives. In a high-speed molding machine for thermoplastic synthetic resin film, which is made into a film of a predetermined thickness by being brought into close contact with cold air pressure blown from an outlet and cooled, the upper surface of the molten film between the slit of the T-die and the outlet of the air knife. A high-speed molding machine for thermoplastic synthetic resin film, characterized in that a cover body surrounding the T-die and the air knife in a state substantially cut off from the outside air is expandable and contractible to follow changes in the distance between the T-die and the air knife. 2. The cover body extends in the width direction of the molten film, and includes an upper wall connected to the lower surface of the T-die near the upper end, and connected to the upper surface of the air knife near the lower end, and a pair of left and right panels interconnected by the upper wall. Consisting of the side walls of
The lower end edges of both side walls are in close contact with the circumferential surface of the cooling roll, the bottom surfaces thereof are open toward the circumferential surface of the cooling roll, and are made of bellows-shaped soft synthetic resin. 2. A high-speed molding machine for thermoplastic synthetic resin film according to item 1.
JP58144420A 1983-08-09 1983-08-09 Fast molding of thermoplastic resin film and high-speed molding machine with t-die Granted JPS6036123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58144420A JPS6036123A (en) 1983-08-09 1983-08-09 Fast molding of thermoplastic resin film and high-speed molding machine with t-die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58144420A JPS6036123A (en) 1983-08-09 1983-08-09 Fast molding of thermoplastic resin film and high-speed molding machine with t-die

Publications (2)

Publication Number Publication Date
JPS6036123A JPS6036123A (en) 1985-02-25
JPH0348852B2 true JPH0348852B2 (en) 1991-07-25

Family

ID=15361758

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58144420A Granted JPS6036123A (en) 1983-08-09 1983-08-09 Fast molding of thermoplastic resin film and high-speed molding machine with t-die

Country Status (1)

Country Link
JP (1) JPS6036123A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620219A1 (en) * 1986-06-16 1987-12-17 Hoechst Ag METHOD FOR PRODUCING BIAXIAL STRETCHED FILMS AND DEVICE FOR IMPLEMENTING THE METHOD
JPH0745181B2 (en) * 1987-04-01 1995-05-17 富士写真フイルム株式会社 Laminated product manufacturing method
JP5528980B2 (en) * 2010-10-06 2014-06-25 東洋鋼鈑株式会社 Film manufacturing apparatus and manufacturing method
CN104085070A (en) * 2014-07-02 2014-10-08 湖南紫皇冠新能源技术服务有限公司 Air knife for tape casting of battery diaphragm

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117173U (en) * 1974-03-14 1975-09-25

Also Published As

Publication number Publication date
JPS6036123A (en) 1985-02-25

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