JP2000127227A - Film extrusion device and manufacture of film - Google Patents

Film extrusion device and manufacture of film

Info

Publication number
JP2000127227A
JP2000127227A JP10308406A JP30840698A JP2000127227A JP 2000127227 A JP2000127227 A JP 2000127227A JP 10308406 A JP10308406 A JP 10308406A JP 30840698 A JP30840698 A JP 30840698A JP 2000127227 A JP2000127227 A JP 2000127227A
Authority
JP
Japan
Prior art keywords
film
flow path
thickness
layer
extruder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10308406A
Other languages
Japanese (ja)
Inventor
Tsukasa Nishimura
司 西村
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.)
Teijin Ltd
Original Assignee
Teijin 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 Teijin Ltd filed Critical Teijin Ltd
Priority to JP10308406A priority Critical patent/JP2000127227A/en
Publication of JP2000127227A publication Critical patent/JP2000127227A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/07Flat, e.g. panels
    • B29C48/08Flat, e.g. panels flexible, e.g. films
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92009Measured parameter
    • B29C2948/92085Velocity
    • B29C2948/92104Flow or feed rate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92009Measured parameter
    • B29C2948/92114Dimensions
    • B29C2948/92152Thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92323Location or phase of measurement
    • B29C2948/92361Extrusion unit
    • B29C2948/92409Die; Nozzle zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/9258Velocity
    • B29C2948/926Flow or feed rate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92609Dimensions
    • B29C2948/92647Thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92857Extrusion unit
    • B29C2948/92904Die; Nozzle zone

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To achieve quickly a target average thickness and its distribution of respective layers of a laminated film by controlling the flow rate in respective branched flow paths formed from a branched point through a manifold and adjusting the width distribution in the die width direction of respective layers corresponding to respective flow paths. SOLUTION: Valves 8a and 8b of a flow rate control means for changing the flow rate are provided respectively on branched flow paths 7a and 7b after being branched in an adapter 5, and respective valves 8a and 8b are connected with a valve connecting means 9 so that the respective valves can be driven independently. Also thickness control means for changing the thickness distribution in the film width direction of respective layers are provided in respective flow paths between manifolds 10a-10c of a multi-manifold die 11 and a junction. Also a thickness control means formed of a bolt driving means 15 for pushing and drawing a flexible lip 13 by a differential bolt 14 is provided on a flow path of the manifold 10b.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明はフィルムの押出装置
及び製造方法に関し、更に詳しくは積層フィルムの積層
数より押出機台数が少ない場合において、各層個別の目
標平均厚み及びその分布を速やかに達成するフィルムの
押出装置及び製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for extruding a film, and more particularly, to quickly attain a target average thickness of each layer and its distribution when the number of extruders is smaller than the number of laminated films. The present invention relates to a film extrusion apparatus and a manufacturing method.

【0002】[0002]

【従来の技術】溶融樹脂の複数層のフィルムを積層した
積層フィルムの製造方法としては、今日では、複数の押
出機を用いて同時に押出し成形する共押出の方法がかな
り一般的な方法となっている。この方法においては、複
数の押出機から押出された樹脂は必要に応じ、異物や未
溶融樹脂などを濾過するフィルタや、増圧や定量性向上
のためのギアポンプを経由して、ダイに導かれる。
2. Description of the Related Art As a method for producing a laminated film in which a plurality of layers of a molten resin are laminated, a co-extrusion method in which a plurality of extruders are simultaneously extruded to form a laminated film has become a quite common method. I have. In this method, the resin extruded from a plurality of extruders is guided to a die via a filter for filtering foreign substances and unmelted resin, etc., as necessary, and a gear pump for increasing pressure and improving quantitativeness. .

【0003】この共押出しの製造方法は、多層化するた
めに樹脂をどこで積層するかによって、いくつかに分類
される。基本的にフィルム幅に拡幅する前に積層するフ
ィードブロック方法と、複数のマニホールドを備えて拡
幅後積層するマルチマニホールド方法と、両者を組み合
わせる方法がある。
[0003] This coextrusion manufacturing method can be classified into several types depending on where the resin is laminated for multilayering. Basically, there are a feed block method in which the layers are laminated before the film is widened to the film width, a multi-manifold method in which a plurality of manifolds are provided and laminated after the width is widened, and a method in which both are combined.

【0004】粘度などの樹脂流動特性が大きく異なる樹
脂の積層では、拡幅する前に積層するフィードブロック
方法では、 各層の厚み分布を細かくコントロールする
ことが難しい。そのため、拡幅後積層するマルチマニー
ホールド方法が有利である。マルチマニーホルド方法で
あれば、各層ごとに流量の均一化を目指した最適設計が
比較的容易であり、積層されるまでの間の流路に厚み分
布を調整する機構を設けることも可能である。厚み調整
機構としてはチョーカーバーを利用する方式はかなり一
般的である。単層ダイの厚み調整機構として一般的であ
る壁面の温度をコントロールする方法を特開昭63−1
20629号公報開示のごとく適用したり、実開平7−
15320号公報開示のごとく薄肉厚のフレキシブルリ
ップを用いる方法もある。
In the case of laminating resins having greatly different resin flow characteristics such as viscosity, it is difficult to finely control the thickness distribution of each layer by a feed block method in which lamination is performed before widening. Therefore, a multi-manifold method of laminating after widening is advantageous. With the multi-manifold method, it is relatively easy to optimize the design aiming at uniform flow rates for each layer, and it is also possible to provide a mechanism for adjusting the thickness distribution in the flow path until the layers are stacked. . As a thickness adjusting mechanism, a method using a choker bar is quite common. A method for controlling the temperature of the wall surface, which is generally used as a mechanism for adjusting the thickness of a single-layer die, is disclosed in JP-A-63-1.
It can be applied as disclosed in Japanese Patent No. 20629,
As disclosed in Japanese Patent Application No. 15320, there is a method using a thin flexible lip.

【0005】一方、積層された各層の厚み比は、それぞ
れの押出し系、すなわち押出機やギアポンプの吐出量比
で決定するのが一般的である。しかし、フィルムの積層
は必ずしも層数分の異なる押出機から押出される必要は
ない。例えば、3層フィルムにおいて、2層の表層は1
台の押出機から押出され、中心の芯層は別の1台の押出
機から押出されるという方が設備投資の面では有利であ
る。この場合は押出機からダイのマニーホールドに至る
前に表層の流れを2流路に分岐するアダプタ手段が必要
である。分岐した各層を目標厚みにコントロールするに
は、所望の厚み比になるように分岐以降の分岐流路につ
いてあらかじめ圧力損失バランスを見込んだ設計とした
り、マニーホールドから合流部までの流路の間隙を変化
させる手段を用いることが考えられる。また特開平2−
286217号公報開示のごとくダイ導入部のアダプタ
と言われる部分に調整バーを組み込む方法も提案されて
いる。
On the other hand, the thickness ratio of each laminated layer is generally determined by the respective extrusion systems, that is, the discharge rate ratio of an extruder or a gear pump. However, the film stack does not necessarily have to be extruded from different extruders for the number of layers. For example, in a three-layer film, the two surface layers are 1
It is advantageous in terms of capital investment that the extruder is extruded from one extruder and the central core layer is extruded from another extruder. In this case, an adapter for branching the surface flow into two flow paths before the extruder reaches the die manifold is required. In order to control each of the branched layers to the target thickness, the branch flow path after branching should be designed with a pressure loss balance in advance so that the desired thickness ratio is achieved, or the gap between the flow path from the manifold to the junction is made. It is conceivable to use means for changing. In addition, Japanese Unexamined Patent Publication
As disclosed in Japanese Patent Publication No. 286217, there has been proposed a method of incorporating an adjustment bar in a portion of the die introduction portion called an adapter.

【0006】[0006]

【発明が解決しようとする課題】近年、フィルムに対
し、異なる特性を持つ樹脂を複層化して付加価値を高め
るニーズが高まっている。さらにこの場合、多層フィル
ムのトータル厚みのみならず、所定の機能を持つ層の幅
方向厚みを斑なくコントロールすることが求められてい
る。
In recent years, there has been an increasing need to increase the added value of a film by forming multiple layers of resins having different properties. Further, in this case, it is required to control not only the total thickness of the multilayer film but also the thickness in the width direction of the layer having a predetermined function.

【0007】多層フィルムで各層の幅方向の厚み分布を
コントロールするには、マルチマニーホールド法で、各
層毎に流量分布を変化させる機構を持たせる必要があ
る。また、フィルム生産工程は幅方向に均一のものとは
なり得ず、ダイから押し出される溶融樹脂の流量分布の
目標値は、必ずしも全幅均一流量であるとは限らない。
しかも製膜条件や経時で変わりうるものである。したが
って運転中に目標厚みに向け厚み分布を変更できるもの
でなければならない。
In order to control the thickness distribution in the width direction of each layer in a multilayer film, it is necessary to provide a mechanism for changing the flow rate distribution for each layer by the multi-manifold method. Further, the film production process cannot be uniform in the width direction, and the target value of the flow rate distribution of the molten resin extruded from the die is not always the uniform flow rate over the entire width.
In addition, it can be changed depending on film forming conditions and aging. Therefore, it must be possible to change the thickness distribution during operation to the target thickness.

【0008】一方設備投資を削減する目的から、積層の
うち同一樹脂の層があるならば、押出機やギアポンプ等
の押出系は共通化したい。したがって一つの押出系から
その流路を分岐し、各々のマニーホルドに接続すること
になるが、その圧力バランスで各層の平均厚みが変わっ
てしまうため、前述の特開平2−286217号公報開
示のごとく絞り弁を設けることが考えられる。しかし各
層の厚み分布を変更する操作自体が層間の厚みバランス
を変更させることになり、折角調整した平均厚み比が運
転中に変わってしまう問題がる。
On the other hand, for the purpose of reducing capital investment, if there are layers of the same resin in the laminate, it is desirable to use a common extrusion system such as an extruder and a gear pump. Therefore, the flow path is branched from one extrusion system and connected to each manifold. However, since the average thickness of each layer changes due to the pressure balance, as disclosed in the above-mentioned JP-A-2-286217. It is conceivable to provide a throttle valve. However, the operation of changing the thickness distribution of each layer itself changes the thickness balance between the layers, and there is a problem that the average thickness ratio adjusted at the angle changes during operation.

【0009】また、絞り弁は保守の観点から単純かつ小
型のものが求められ、フィルムの品質の観点からは滞留
部がないものが求められる。更に、各層の平均厚みも、
単層フィルム並みの精度で保証されることが求められつ
つある。これらの調整はその求められる精度と層数によ
り、煩雑さが増大するため、それらを軽減する必要があ
る。本発明はかかる現状に鑑みてなされたもので、積層
フィルムの各層個別の目標平均厚み及びその分布を速や
かに達成できるフィルムの押出装置及び製造方法を目的
とするものである。
Further, the throttle valve is required to be simple and small from the viewpoint of maintenance, and is required to have no stagnation portion from the viewpoint of film quality. Furthermore, the average thickness of each layer also
It is required to be assured with the same accuracy as a single-layer film. These adjustments increase the complexity due to the required accuracy and the number of layers, and therefore need to be reduced. The present invention has been made in view of such circumstances, and has as its object to provide a film extrusion apparatus and a manufacturing method capable of quickly achieving a target average thickness and distribution of each layer of a laminated film.

【0010】[0010]

【課題を解決するための手段】上述の目的は、以下の本
発明により達成される。すなわち、本発明は、押出系か
らの溶融樹脂を複数の分岐流路に分岐するアダプタ手段
と、分岐流路からの溶融樹脂を受け入れる複数のマニホ
ールドを備え、マニホールドに供給された溶融樹脂を層
状に合流させて積層フィルムとして押出す複層ダイとか
らなるフィルムの押出装置において、分岐点からマニホ
ールドの間の各分岐流路にその流量を調整する流量調整
手段を設けると共に、マニホールドから合流点までの各
流路に当該流路に対応する層のダイ幅方向の厚み分布を
調整する厚み調整手段を設けたことを特徴とするフィル
ムの押出装置であり、この押出装置を用いてフィルムを
製造することを特徴とするフィルムの製造方法である。
The above objects are achieved by the present invention described below. That is, the present invention includes an adapter means for branching the molten resin from the extrusion system into a plurality of branch flow paths, and a plurality of manifolds for receiving the molten resin from the branch flow paths, and forms the molten resin supplied to the manifold into a layer. In a film extruder comprising a multilayer die that is joined and extruded as a laminated film, while providing flow rate adjusting means for adjusting the flow rate in each branch flow path from the branch point to the manifold, and from the manifold to the junction point A film extruder, wherein each channel is provided with a thickness adjusting means for adjusting a thickness distribution in a die width direction of a layer corresponding to the channel, and a film is manufactured using the extruder. A method for producing a film.

【0011】上記の本発明において、流量調整手段が、
流路断面積を変化させて流量を調整するバルブが、滞留
部がなく、運転中にも容易に調整できる点好ましい。こ
の点から、中でも、後述の実施例に用いた、以下の構成
のバルブが好ましく用いられる。すなわち、矩形断面の
流路と、矩形断面の幅とほぼ同じ半径の円柱からなり、
その円周から所定距離の弦まで矩形断面高さとほぼ同じ
長さだけ削り落とした流路面積調整部材とを備え、該流
路面積調整部材をその削除部分が流路内に位置するよう
に流路の側壁に側壁位置が回転中心になるように回転可
能に設けたバルブである。
In the above-mentioned present invention, the flow rate adjusting means includes:
It is preferable that the valve for adjusting the flow rate by changing the flow path cross-sectional area has no stagnation portion and can be easily adjusted even during operation. From this point, the valve having the following configuration, which is used in Examples described later, is preferably used. That is, it is composed of a channel having a rectangular cross section and a column having a radius substantially equal to the width of the rectangular cross section,
A flow path area adjusting member cut down from the circumference to a chord at a predetermined distance by a length substantially equal to the height of the rectangular cross section, and the flow path area adjusting member is flown so that the removed portion is positioned in the flow path. The valve is provided rotatably on the side wall of the road such that the position of the side wall becomes the center of rotation.

【0012】また、中心層の厚み調整手段が、流路の側
壁を薄肉厚部としたフレキシブルリップ方式であり、表
層の厚み調整手段が、流路の壁面温度を変化させる温度
調整方式であることが、ダイの構成面から好ましい。
Further, the thickness adjusting means of the center layer is a flexible lip type in which the side wall of the flow path has a thin-walled portion, and the thickness adjusting means of the surface layer is a temperature adjusting method of changing the wall surface temperature of the flow path. Is preferable from the viewpoint of the configuration of the die.

【0013】一方、本発明の製造方法においては、積層
フィルムの各層の幅方向の平均厚み及び厚み分布を測定
し、その平均厚みの各測定値を各層の流量調整手段にフ
ィードバックし、その厚み分布の各測定値を厚み調整手
段にフィードバックして、各層の厚み制御をすること
が、品質、安定生産、生産性向上面から好ましい。な
お、この厚み測定は、積層フィルムを各層に分離した後
の各単層フィルムにおいて測定する方法が、測定の信頼
性面から好ましい。以下、本発明の詳細を実施例により
説明する。
On the other hand, in the production method of the present invention, the average thickness and the thickness distribution of each layer of the laminated film in the width direction are measured, and the measured values of the average thickness are fed back to the flow rate adjusting means of each layer to obtain the thickness distribution. It is preferable to control the thickness of each layer by feeding back each measured value of the above to the thickness adjusting means from the viewpoint of quality, stable production and productivity improvement. In addition, the method of measuring the thickness of each single-layer film after separating the laminated film into each layer is preferable from the viewpoint of measurement reliability. Hereinafter, details of the present invention will be described with reference to examples.

【0014】[0014]

【発明の実施の形態】上述の本発明は、積層フィルムを
成形するに当たり、そのうち同一溶融樹脂の層は同一の
押出機から押し出した後、流路を分岐し、各々をダイの
各マニーホールドに導き、各層が積層されたシート状体
として押し出し積層フィルムに成形するものであって、
該流路分岐以降からマニーホールドに導入される間に、
流路断面積を変化させ流量を変更可能としたバルブ等の
流量調整手段を設け、かつマニーホールドから積層のた
めの合流点に至る間に、ダイ幅方向に吐出分布を変え得
る厚み調整手段を有するダイを使用し、かつ何れの調整
も運転中に可能としたことを特徴とする。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-mentioned present invention, in forming a laminated film, the same molten resin layer is extruded from the same extruder, the flow path is branched, and each of the layers is connected to each manifold of the die. Guiding and forming each layer into an extruded laminated film as a laminated sheet,
While being introduced into the manifold after the passage branch,
Provide a flow rate adjusting means such as a valve that can change the flow rate by changing the flow path cross-sectional area, and a thickness adjusting means that can change the discharge distribution in the die width direction from the manifold to the junction for lamination. The present invention is characterized in that a die having the same is used, and any adjustment can be performed during operation.

【0015】この厚み調整手段は、各層の厚み分布を目
的の分布に調整するすべく、マルチマニーホールドで各
層毎に流量分布を調整できるものであればよい。その具
体例としては、単層フィルムの厚み制御で実績の多い、
流路断面積を変化させるフレキシブルリップとボルトの
熱膨張を利用したヒートボルト等の駆動手段との組み合
わせのフレキシブルリップ方式や、壁面の温度を変化さ
せる温度リップ等の温度調整方式、あるいはチョーカー
バーをフィルム幅方向に撓み易い構造に工夫した上でヒ
ートボルト等の駆動手段と組み合わせたチョーカーバー
方式等が挙げられる。この駆動手段としては、ヒートボ
ルトの代わりに単なるボルト、或いはピッチ差のあるボ
ルトを組み合わせた差動ボルトを利用してモーター等で
駆動するようにしたものも適用できる。
The thickness adjusting means only needs to be capable of adjusting the flow rate distribution for each layer by a multi-manifold in order to adjust the thickness distribution of each layer to a target distribution. As a specific example, there are many achievements in controlling the thickness of a single-layer film,
A flexible lip system that combines a flexible lip that changes the cross-sectional area of the flow path with a driving means such as a heat bolt that utilizes the thermal expansion of a bolt, a temperature adjustment system such as a temperature lip that changes the temperature of the wall surface, or a choker bar. A choker bar method in which a structure that is easy to bend in the film width direction is devised and then combined with a driving means such as a heat bolt is used. As the driving means, a means driven by a motor or the like using a simple bolt or a differential bolt combining bolts having a pitch difference instead of the heat bolt can be applied.

【0016】また、分岐した各層の平均厚みを目標値に
調整するためには、そのトータル押し出し量の調整が必
要だが、バルブ等の流量調整手段により同一押出機から
繋がる分岐した分岐流路の流量を調整することにより、
その比率を変化させる。この流量調整手段は、分岐部分
にバランス弁を設けるタイプでも良い。また、流量調整
手段を分岐後のすべての分岐流路に設けても良いが、制
御したい層のみに設けるとか、他方の1本には設けない
とかの方が構造は単純になる。
In order to adjust the average thickness of each of the branched layers to the target value, it is necessary to adjust the total extrusion amount. However, the flow rate of the branched branch flow path connected from the same extruder by a flow rate adjusting means such as a valve is required. By adjusting
Change the ratio. This flow rate adjusting means may be of a type in which a balance valve is provided at a branch portion. Further, the flow rate adjusting means may be provided in all of the branched flow paths after branching, but the structure becomes simpler if it is provided only in the layer to be controlled or is not provided in the other one.

【0017】以上の通り、本発明は、厚み分布を変更す
ると、特に分岐した流路の層間の圧力バランスが変わ
り、各層の平均厚み比が変化してしまうので、前述の厚
み調整手段と流量調整手段の両方を設け、それを製膜運
転中に調整可能としたところに特徴がある。
As described above, according to the present invention, when the thickness distribution is changed, particularly the pressure balance between the layers of the branched flow path is changed, and the average thickness ratio of each layer is changed. A feature is that both means are provided and can be adjusted during the film forming operation.

【0018】以下、本発明の詳細を実施例共に説明す
る。図1は、本発明の一実施形態の剥離可能な3層フィ
ルムを生産するフィルム製造工程の説明図である。図示
の通り、3層のうち芯となる中心層の樹脂は押出機2に
て溶融押出され、フィルタ4にて異物等を除去し、アダ
プタ5内の流路6を通りマルチマニーホールドダイ11
のマニホールド10bに導かれる。表層の樹脂は押出機
1にて溶融押出され、フィルタ3を通過した後、アダプ
タ5で一つの流路7から二つの分岐流路7a,7bに分
流され、マルチマニーホールドダイ11のマニホールド
10a,10cに導かれる。
Hereinafter, the present invention will be described in detail with reference to embodiments. FIG. 1 is an explanatory diagram of a film manufacturing process for producing a peelable three-layer film according to one embodiment of the present invention. As shown in the figure, the resin of the central layer, which is the core of the three layers, is melt-extruded by the extruder 2, the foreign matter and the like are removed by the filter 4, and the multi-manifold die 11 passes through the flow path 6 in the adapter 5.
To the manifold 10b. The resin of the surface layer is melt-extruded by the extruder 1, passes through the filter 3, and is divided by the adapter 5 from one flow path 7 to two branch flow paths 7 a and 7 b. It is led to 10c.

【0019】アダプタ5内には分岐した後の分岐流路7
a,7b上に流量を変化させることのできるバルブ8
a,8bを各々設けている。バルブ8a,8bは回転に
より流量を変えられるもので,モーター等のバルブ駆動
手段9(バルブ8aの駆動手段は図示省略)と連結し、
各々独立駆動できるようにしてある。
The branch flow path 7 after branching is provided in the adapter 5.
a, a valve 8 with variable flow rate on 7b
a and 8b are provided respectively. The valves 8a and 8b can change the flow rate by rotation, and are connected to valve driving means 9 such as a motor (driving means for the valve 8a is not shown).
Each can be driven independently.

【0020】また、マルチマニホールドダイ11のマニ
ホールド10a,10b,10cから合流点Pの間の各
流路には各層のフィルム幅方向の厚み分布を変化させる
厚み調整手段が設けられている。本例では、表層の流路
すなわちマニホールド10a,10cからの流路には樹
脂に与える熱量を変化させることにより厚み調整をする
電気ヒータ12a,12bからなる温度調整方式の厚み
調整手段が、また芯層の流路すなわちマニホールド10
bの流路は流路上に設けた薄い肉厚のフレキシブルリッ
プ13とそれを押し引きする差動ボルト14とこれを駆
動するモーター等のボルト駆動手段15とからなるフレ
キブルリップ方式の厚み調整手段が設けられている。こ
の組み合わせによりマルチマニホールドダイ11の構成
が図示の如くコンパクトにできる。
Each flow path between the manifolds 10a, 10b, 10c and the junction P of the multi-manifold die 11 is provided with a thickness adjusting means for changing the thickness distribution of each layer in the film width direction. In the present embodiment, the surface flow path, that is, the flow path from the manifolds 10a and 10c, is provided with a temperature adjusting type thickness adjusting means including electric heaters 12a and 12b for adjusting the thickness by changing the amount of heat applied to the resin. Layer flow path or manifold 10
The flow path b is a flexible lip type thickness adjusting means comprising a thin flexible lip 13 provided on the flow path, a differential bolt 14 for pushing and pulling the flexible lip 13 and a bolt driving means 15 such as a motor for driving the flexible lip 13. Is provided. With this combination, the configuration of the multi-manifold die 11 can be made compact as shown in the figure.

【0021】このマルチホールドダイ11から溶融樹脂
は3層積層状態のシート状体として押し出される。そし
てマルチマニホールドダイ11より押し出されたシート
状体は、キャスティング装置16で平坦な未延伸の積層
フィルム19aとなる。そしてこの積層フィルム19a
は、これに続く工程において必要に応じた処理を施さ
れ、所望の製品フィルムが製造される。
The molten resin is extruded from the multi-hold die 11 as a three-layer laminated sheet. Then, the sheet-like body extruded from the multi-manifold die 11 becomes a flat unstretched laminated film 19 a by the casting device 16. And this laminated film 19a
Is subjected to necessary processing in the subsequent steps to produce a desired product film.

【0022】本例は表層がポリエステル,芯層がポリプ
ロピレンのごとく非相溶な樹脂の組み合わせの積層フィ
ルムに好適な処理工程の例である。すなわち、キャステ
ィング装置16からの積層フィルム19aは、縦延伸機
17及び横延伸機18で3層のまま逐次2軸延伸され、
2軸延伸された積層フィルム19bが得られる。この積
層フィルム19bの表層と芯層は機械的に剥離可能であ
り、分離装置20にてそれを連続的に剥離して3枚の2
軸延伸された単層フィルム21a〜21cに分離し、夫
々巻取機25〜27で連続的に巻き取る.このように3
枚のフィルムが同時に製造できる。
This embodiment is an example of a processing step suitable for a laminated film in which a combination of incompatible resins such as polyester and polypropylene are used for the surface layer and the core layer. That is, the laminated film 19a from the casting device 16 is successively biaxially stretched in three layers by the longitudinal stretching machine 17 and the transverse stretching machine 18,
A biaxially stretched laminated film 19b is obtained. The surface layer and the core layer of the laminated film 19b can be mechanically peeled off.
The film is separated into axially stretched single-layer films 21a to 21c, and continuously wound by winders 25 to 27, respectively. Thus 3
Two films can be manufactured simultaneously.

【0023】ところで、本例では分離装置20から巻取
機25〜27の間で単層フィルム21a〜21cすなわ
ち積層フィルム19の各層の厚みを厚み計22〜24に
て個別に測定し、厚み制御装置28にフィードバックし
て、以下の各層の厚み制御を行なっている。この厚み制
御手段は、公知のフィルムの厚み制御と同様で、厚み計
22〜24で各層の幅方向に走査して各層の幅方向の所
定の各測定点で厚みを測定し、その各測定値を厚み制御
装置28の各層の厚み制御部にフィードバックし、各厚
み制御部からフィルム幅方向の厚み斑を減少させるべく
前述した各層の厚み調整手段の幅方向に並設した各々の
電気ヒータ12a、12b、ボルト駆動手段15に指令
を与えて幅方向の厚み分布を制御するようになってい
る。
In the present embodiment, the thickness of each of the single-layer films 21a to 21c, that is, each layer of the laminated film 19 is individually measured by the thickness gauges 22 to 24 between the separation device 20 and the winders 25 to 27 to control the thickness. The thickness of each of the following layers is controlled by feeding back to the device 28. This thickness control means is similar to known film thickness control, and scans in the width direction of each layer with a thickness gauge 22 to 24 to measure the thickness at each predetermined measurement point in the width direction of each layer, and measures each measured value. Is fed back to the thickness control unit of each layer of the thickness control device 28, and the respective electric heaters 12a arranged in parallel in the width direction of the thickness adjustment means of each layer described above in order to reduce thickness unevenness in the film width direction from each thickness control unit. 12b, a command is given to the bolt driving means 15 to control the thickness distribution in the width direction.

【0024】本例では、さらに厚み制御装置28は以下
の流量制御手段を備えている。すなわち、上記各層のう
ち両側の表層について幅方向の各測定値からその平均厚
みを求め、夫々の流量制御部にフィードバックし、目標
値に制御するためには、流量調整手段のバルブ8a,8
bの駆動手段9に指令を与えて制御し、これにより両表
層の平均厚みのバランスを取るようになっている。
In this embodiment, the thickness control device 28 further includes the following flow control means. In other words, in order to obtain the average thickness from the measured values in the width direction for the surface layers on both sides of each of the above layers and feed it back to the respective flow rate control units to control the average value, the valves 8a and 8 of the flow rate adjusting means are required.
The control is performed by giving a command to the driving means 9 of b, whereby the average thickness of both surface layers is balanced.

【0025】以上、本例によれば、一系列の製造ライン
で同時に3枚の単層フィルムが生産でき、非常に生産性
のよい製造方法が実現される。
As described above, according to this embodiment, three single-layer films can be simultaneously produced on one series of production lines, and a production method with extremely high productivity is realized.

【0026】ところで、本例のアダプタ5及びバルブ8
a,8bは、滞留部が少ない図2、図3に示す構成とな
っている。図2に示すように、アダプタ5の分岐流路7
a,7bの断面形状は、区間Aで円形断面から矩形断面
に滞留部がないように漸進的に変更され、区間B,Cは
矩形断面のままで、区間Dで再び漸進的に円形断面に戻
している。なお、矩形断面は、幅がWで、高さがHとな
っている。
The adapter 5 and the valve 8 of this embodiment
a and 8b have the configuration shown in FIGS. As shown in FIG.
The cross-sectional shapes of a and 7b are gradually changed from a circular cross-section to a rectangular cross-section in section A so that there is no stagnation portion, and sections B and C remain rectangular in cross-section and gradually change to circular cross-section in section D again. I'm back. The rectangular section has a width of W and a height of H.

【0027】この区間B,Cには、図3に示すようなバ
ルブ8a,8bが設けれている。すなわち、図2に示す
ように設置箇所の流路断面の幅Wと同じ半径で弁体とな
る円筒のピン35がその半円部で区間B、Cの矩形断面
の分岐流路7a、7bを遮るように設けられている。こ
のピン35は、図3に示すようにその一端はアダプタ5
の本体36から突き出し、その適所にドーナツ状の止め
片35aが設けられている。また、その他端には、ボタ
ン状の支持部材41aを適所に設けたジャッキボルト4
1を挿入して、その中心孔に螺合させ、支持部材41a
によりピン35の他端を支持し、その取付位置を調整で
きるようになっている。
In sections B and C, valves 8a and 8b as shown in FIG. 3 are provided. That is, as shown in FIG. 2, a cylindrical pin 35 serving as a valve body having the same radius as the width W of the flow path cross section at the installation location forms a branch flow path 7 a, 7 b having a rectangular cross section in sections B and C at its semicircular portion. It is provided so as to block. As shown in FIG. 3, one end of this pin 35
And a donut-shaped stopper 35a is provided at an appropriate position. On the other end, a jack bolt 4 having a button-shaped support member 41a provided at an appropriate position.
1 and screwed into the center hole of the support member 41a.
With this, the other end of the pin 35 is supported, and its mounting position can be adjusted.

【0028】このピン35は図3の如く、本体36に設
けられた取付穴に挿入され、上下のリング状のパッキン
37でシールされ、分岐流路7a,7bの側壁Sの位置を中心
にして回転可能となっている。なお、図の38は、図で
上部のパッキン37を止め片35a共に押さえる上部の
パッキン押えであり、図の39が図で下部のパッキン3
7を皿状のカラー42を介して押さえる下部のパッキン
押えである。
As shown in FIG. 3, the pin 35 is inserted into a mounting hole provided in the main body 36, sealed with upper and lower ring-shaped packings 37, and centered on the position of the side wall S of the branch flow paths 7a, 7b. It is rotatable. Reference numeral 38 in the drawing denotes an upper packing presser for pressing the upper packing 37 together with the stopper 35a, and 39 in the drawing denotes a lower packing 3 in the drawing.
7 is a packing retainer at the lower part that presses 7 through a dish-shaped collar 42.

【0029】ところで、ピン35は流路内に位置する部
分すなわち弁体部において図2に白地で示すように円周
の4分の1の弧を弦に至るまで流路高さHp分だけ削り
取って、切欠部35bを形成している。従って、このバ
ルブは、図2に示すように切欠部35bの切欠面がこれ
に対向する分岐流路7a,7bの側壁と平行な場合が最
大開度で、これより90度回転すると閉止となる。
The pin 35 is used to cut off a quarter arc of the circumference by the flow path height Hp at the portion located in the flow path, that is, the valve body portion, as shown by a white background in FIG. Thus, a notch 35b is formed. Therefore, as shown in FIG. 2, this valve has the maximum opening when the cut surface of the cut portion 35b is parallel to the side walls of the branch flow paths 7a and 7b opposed thereto, and closes when rotated by 90 degrees. .

【0030】以上、本例のバルブ8a,8bは、ピン3
5のアダプタ5から飛び出した端部の連結部にバルブ駆
動手段9を連結して上述のように0から90度まで回転
させることで、ほぼ全閉まで流量を絞る事ができる。樹
脂はどの開度であっても十分に大きな曲率を持ったピン
に沿って流れるため滞留部分は殆どない。また、この構
造は極めて単純であり,工作性も保守性も良い。
As described above, the valves 8a and 8b of this embodiment
By connecting the valve driving means 9 to the connecting portion at the end protruding from the adapter 5 and rotating the valve driving means 9 from 0 to 90 degrees as described above, it is possible to reduce the flow rate to almost fully closed. The resin flows along a pin having a sufficiently large curvature at any opening degree, so that there is almost no stagnation portion. In addition, this structure is extremely simple, and has good workability and maintainability.

【0031】さらに、滞留部を極力減らすため、分岐流
路7a,7bの区間B,Cの高さHb,Hcと幅Wb,
Wcの間に、下記の式が成立するように、分岐流路7
a,7bは下流に向かって僅かづつ縮小するようにした
方が良い。なお、Hp,Wpは、バルブ設置箇所の分岐
流路7a,7bの高さと幅である。 Hb>Hp>Hc、Wb>Wp>Wc
Furthermore, in order to reduce the staying portion as much as possible, the heights Hb and Hc and the widths Wb and Hb of the sections B and C of the branch passages 7a and 7b are reduced.
During Wc, the branch flow path 7 is set so that the following equation is satisfied.
It is better to reduce a and 7b little by little toward the downstream. In addition, Hp and Wp are the height and width of the branch flow paths 7a and 7b at the valve installation location. Hb>Hp> Hc, Wb>Wp> Wc

【0032】なお、バルブ8a,8bは滞留部がなくフ
ィルム品質に悪影響がないものであれば、精密な制御を
するためにはバルブの操作による流量変化が大きく、か
つ温度等の外乱を受け難くするべきである。したがっ
て、理想的にはマニーホールドに極力近い方が良い。極
言すると厚み分布を調整する厚み調整手段の幅方向に配
置した各ユニットを全幅同時に調整すれば良いと考えが
ちだが、一般に厚み調整手段は大きな流量変化を全幅均
一に与えることは難しいので、上述の本例のバルブを用
いるより有利なものではない。したがってダイ導入部に
本例のバルブを組み込んだアダプタを直結、あるいは一
体化した構成が好ましい。
If the valves 8a and 8b have no stagnation portion and have no adverse effect on the film quality, the flow rate changes greatly due to the operation of the valves in order to perform precise control, and the valve 8a is hardly affected by disturbance such as temperature. Should be. Therefore, ideally, it is better to be as close as possible to the manifold. In other words, it is easy to think that it is sufficient to adjust each unit arranged in the width direction of the thickness adjusting means for adjusting the thickness distribution at the same time in the entire width, but since it is generally difficult for the thickness adjusting means to give a large flow rate change over the entire width uniformly, It is not more advantageous than using the valve of this example. Therefore, it is preferable that the adapter incorporating the valve of the present example is directly connected to or integrated with the die introduction portion.

【0033】また、上述の本例の製造方法は、幅方向の
厚み分布制御も緻密さが求められるケースに好ましく適
用される。かかるケースとしては、例えば感熱転写リボ
ン用フィルム等の一般用フィルムや磁気記録用フィルム
等を生産性よく製膜するために、互いに相溶しないポリ
マーを共押出して未延伸の積層フィルムとなし、さらに
少なくとも一軸延伸した後積層フィルムを剥離して製品
の単層フィルムを一挙に2つ以上製膜する方法(特開昭
51−30862号、特開昭56−113427号、特
開昭58−5226号等)や、加工工程において切断が
起こり易い、コンデンサー用等の薄物フィルムと非相溶
な素材のキャリヤーフィルムを積層補強して加工を行
い、加工完了後、加工された積層フィルムをキャリヤー
フィルムから剥離し巻き取ることで、切断を軽減させる
(特開平04−7198号)方法等が挙げられる。
Further, the above-described manufacturing method of the present example is preferably applied to a case where the control of the thickness distribution in the width direction is also required to be fine. As such a case, for example, in order to produce a film for general use such as a film for thermal transfer ribbon or a film for magnetic recording with high productivity, co-extruding mutually incompatible polymers into an unstretched laminated film, and After at least uniaxial stretching, the laminated film is peeled off, and two or more monolayer films of the product are formed at a time (Japanese Patent Application Laid-Open Nos. Sho 51-30862, 56-113427, and 58-5226). Etc.) and a carrier film of a material incompatible with a thin film for capacitors, etc., which is apt to be cut in the processing process, is reinforced and processed, and after processing is completed, the processed laminated film is peeled off from the carrier film A method of reducing cutting by winding (Japanese Patent Laid-Open No. 04-7198) can be cited.

【0034】なお、厚み測定は、本例の剥離後の他、積
層状態すなわち積層フィルムでもよい。そしてこの測定
にはオンラインの厚み計を用いる。厚み計はβ線厚み
計、光干渉式厚み計、赤外線厚み計等を用いれば良く、
積層フィルムのままで測定する場合には反射で測定可能
な光干渉式が適用できる。
The thickness may be measured not only after the peeling in this example but also in a laminated state, that is, a laminated film. An online thickness gauge is used for this measurement. The thickness gauge may be a β-ray thickness gauge, an optical interference thickness gauge, an infrared thickness gauge, etc.
When the measurement is performed with the laminated film as it is, an optical interference method that can be measured by reflection can be applied.

【0035】本発明における熱可塑性樹脂としては、フ
ィルム形成性を有するものであれば特に制約はないが、
ポリエステル、ポリアミド、ポリカーボネート、ポリオ
レフィン等が好ましく例示できる。この中ポリエステ
ル、ポリオレフィンが、特にポリエステルが好ましい。
The thermoplastic resin in the present invention is not particularly limited as long as it has a film forming property.
Preferred examples include polyester, polyamide, polycarbonate, and polyolefin. Among them, polyester and polyolefin are particularly preferable.

【0036】前記ポリエステルとしては芳香族ポリエス
テルが好ましく、特にポリエチレンテレフタレート、ポ
リエチレン−2、6−ナフタレートが好ましい。またポ
リオレフィンとしてはポリエチレン、ポリプロピレンが
好ましく、特にポリオレフィンが好ましい。
The polyester is preferably an aromatic polyester, particularly preferably polyethylene terephthalate or polyethylene-2,6-naphthalate. As the polyolefin, polyethylene and polypropylene are preferable, and polyolefin is particularly preferable.

【0037】前記ポリマーとしてはフィルムの使用目的
によってホモポリマー、コポリマーのいずれも使用でき
る。
As the polymer, either a homopolymer or a copolymer can be used depending on the purpose of the film.

【0038】以下に、上述の装置で実施した本発明のフ
ィルム製造の実施例並びに、これに対比する比較例を説
明する。
Hereinafter, examples of the film production of the present invention carried out by the above-described apparatus and comparative examples for comparison will be described.

【0039】[0039]

【実施例及び比較例】ポリエステル原料として、酢酸カ
リウムをジカルボン酸成分に対し12mmol%、平均
粒子径0.9μmのカオリンを0.3wt%添加した固
有粘度が0.60のポリエチレンテレフタレートのペレ
ットを用い、これを170℃で3時間乾燥した後、押出
機1に供給し、280℃で溶融押出した。
EXAMPLES AND COMPARATIVE EXAMPLES Polyethylene terephthalate pellets having an intrinsic viscosity of 0.60 obtained by adding potassium acetate to the dicarboxylic acid component in an amount of 12 mmol% and kaolin having an average particle diameter of 0.9 μm in an amount of 0.3 wt% were used as polyester raw materials. After drying at 170 ° C. for 3 hours, the mixture was supplied to the extruder 1 and melt-extruded at 280 ° C.

【0040】一方、ポリオレフィン原料としてアナター
ゼ型チタンを1.0wt%と3,5−ジカルボキシベン
ゼンスルホン酸テトラ−n−ブチルホスホニウムを0.
05wt%含有させたポリプロピレン(Tm:152
℃、メルトフローレイト:5g/10分、エチレン共重
合ポリプロピレン、エチレン含有比3mol%)のペレ
ットを用い、100℃で1時間乾燥した後、押出機2に
供給し、ポリエチレンテレフタレートと同様の温度28
0℃で溶融押出した。
On the other hand, 1.0 wt% of anatase type titanium and 0.1% of tetra-n-butylphosphonium 3,5-dicarboxybenzenesulfonate were used as polyolefin raw materials.
Polypropylene (Tm: 152)
C., melt flow rate: 5 g / 10 min, ethylene copolymerized polypropylene, ethylene content ratio: 3 mol%), dried at 100.degree. C. for 1 hour, supplied to the extruder 2, and heated to the same temperature as polyethylene terephthalate.
It was melt extruded at 0 ° C.

【0041】各々の溶融ポリマーはダイ11内部で合流
し、ポリエチレンテレフタレート/ポリプロピレン/ポ
リエチレンテレフタレートの3層が積層された状態で、
ダイ11の幅760mmの口金からシート状に吐出され
た。次いでこのシート状体を20℃に保たれた冷却ドラ
ム16に静電ワイヤ16aで静電荷を印加しながら巻き
付け、冷却固化して3層の未延伸の積層フィルムとし
た。
Each of the molten polymers merges inside the die 11, and three layers of polyethylene terephthalate / polypropylene / polyethylene terephthalate are laminated.
It was discharged in a sheet form from a die having a width of 760 mm of the die 11. Next, the sheet was wound around a cooling drum 16 maintained at 20 ° C. while applying an electrostatic charge with an electrostatic wire 16a, and cooled and solidified to form a three-layer unstretched laminated film.

【0042】この未延伸の積層フィルムを、縦延伸機1
7で加熱ロールに接触させて80℃に加熱した後、長手
方向に3.6倍延伸し、直ちに20℃まで冷却した。続
いて横延伸機18具体的にはテンター式横延伸装置にお
いて90℃で横方向に3.9倍延伸した後、120℃で
熱処理を施し、室温まで冷却した。次いで、分離装置2
0で夫々の単層フィルムに分離して図示のように巻き取
った。
The unstretched laminated film is subjected to a longitudinal stretching machine 1
After contacting with a heating roll at 7 and heating to 80 ° C, the film was stretched 3.6 times in the longitudinal direction and immediately cooled to 20 ° C. Subsequently, the film was stretched 3.9 times in the transverse direction at 90 ° C. in a transverse stretching machine 18, specifically, a tenter-type transverse stretching device, and then heat-treated at 120 ° C. and cooled to room temperature. Next, the separation device 2
At 0, each single layer film was separated and wound up as shown.

【0043】上述の製造において、比較のために、比較
例として流量調整は全く行なわず、各層の厚み分布の調
整のみを、分離後の各単層フィルムの各々の厚み測定結
果を見て、手動により厚み調整手段により実施した。こ
の結果は、ダイ11の表層の流路は図面上完全に対称に
作られているが、両側の表層各層の平均厚み、厚み分布
は異なった物となり、その厚み調整手段のみの操作で
は、一方の表層の厚み斑を修正すると他方の表層の厚み
分布が変わってしまい、両表層の平均厚みを目標の±1
%、厚み斑をR4%以下に調整する事は出来なかった。
In the above-mentioned production, for comparison, the flow rate was not adjusted at all as a comparative example, and only the thickness distribution of each layer was adjusted by manually checking the thickness measurement results of each single-layer film after separation. This was carried out by a thickness adjusting means. As a result, although the flow path of the surface layer of the die 11 is made completely symmetrical in the drawing, the average thickness and the thickness distribution of each surface layer on both sides are different. When the thickness unevenness of the surface layer is corrected, the thickness distribution of the other surface layer changes, and the average thickness of both surface layers is set to ± 1 of the target.
% And thickness unevenness could not be adjusted to R4% or less.

【0044】次いで、本発明の実施例として、アダプタ
5に設けた流量調整手段による調整を厚み調整に組み合
わせて実施したところ、手動調整で実施したにもかかわ
らず,数時間で上記目標を満足できた。流量調整手段の
調整は操作しても各層の厚み分布の傾向は変化しないと
いう特性があり、短時間で調整が完了した。
Next, as an embodiment of the present invention, when the adjustment by the flow rate adjusting means provided on the adapter 5 was performed in combination with the thickness adjustment, the above target could be satisfied in several hours despite the manual adjustment. Was. The adjustment of the flow rate adjusting means has a characteristic that the tendency of the thickness distribution of each layer does not change even if operated, and the adjustment was completed in a short time.

【0045】[0045]

【発明の効果】本発明によれば、押出される溶融樹脂を
ダイ以前に分岐し、再び他の溶融樹脂とマルチマニーホ
ールドダイで拡幅合流押し出するとき、各層厚み斑の修
正途中で発生する層間の平均厚みの変化を是正し、各層
を所望の厚さに速やかな調整を実現し、厚み品質の良好
な多層フィルムを製造する方法を提供できる。
According to the present invention, when a molten resin to be extruded is branched before a die, and is again expanded and extruded with another molten resin by a multi-manifold die, an interlayer generated during correction of thickness unevenness of each layer. And a method for producing a multilayer film having good thickness quality by realizing quick adjustment of each layer to a desired thickness.

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

【図1】図1は、本発明の一つの実施態様のフィルム製
造工程の説明図である。
FIG. 1 is an explanatory diagram of a film manufacturing process according to one embodiment of the present invention.

【図2】図2は、図1の実施態様に用いたアダプタの部
分断面図である。
FIG. 2 is a partial cross-sectional view of the adapter used in the embodiment of FIG.

【図3】図3は、図2のバルブの構成を示す側断面図で
ある。
FIG. 3 is a side sectional view showing the configuration of the valve of FIG. 2;

【符号の説明】[Explanation of symbols]

1,2 押出機 3,4 フィルタ 5 アダプタ 6 流路 7a,7b 分岐流路 8a,8b バルブ 9 バルブ駆動手段 10a,10b,10c マニホールド 11 マルチマニーホールドダイ 12a,12b 電気ヒータ 13 薄肉厚フレキシブルリップ 14 差動ボルト 15 ボルト駆動手段 16 キャスティング装置 17 縦延伸機 18 横延伸機 19a,19b 積層フィルム 20 分離装置 21a,21b,21c 単層フィルム 22,23,24 厚み計 25,26,27 巻取機 28 厚み制御装置 1, 2 Extruder 3, 4 Filter 5 Adapter 6 Flow path 7a, 7b Branch flow path 8a, 8b Valve 9 Valve driving means 10a, 10b, 10c Manifold 11 Multi-manifold die 12a, 12b Electric heater 13 Thin and flexible lip 14 Differential bolt 15 Bolt driving means 16 Casting device 17 Vertical stretching machine 18 Horizontal stretching machine 19a, 19b Laminated film 20 Separator 21a, 21b, 21c Single-layer film 22, 23, 24 Thickness gauge 25, 26, 27 Winder 28 Thickness control device

Claims (8)

【特許請求の範囲】[Claims] 【請求項1】 押出系からの溶融樹脂を複数の分岐流路
に分岐するアダプタ手段と、分岐流路からの溶融樹脂を
受け入れる複数のマニホールドを備え、マニホールドに
供給された溶融樹脂を層状に合流させて積層フィルムと
して押出す複層ダイとからなるフィルムの押出装置にお
いて、分岐点からマニホールドの間の各分岐流路にその
流量を調整する流量調整手段を設けると共に、マニホー
ルドから合流点までの各流路に当該流路に対応する層の
ダイ幅方向の厚み分布を調整する厚み調整手段を設けた
ことを特徴とするフィルムの押出装置。
1. An apparatus comprising: an adapter for branching a molten resin from an extrusion system into a plurality of branch flow paths; and a plurality of manifolds for receiving the molten resin from the branch flow path. The molten resin supplied to the manifold is merged in a layered manner. In a film extruder comprising a multilayer die extruded as a laminated film, while providing a flow rate adjusting means for adjusting the flow rate in each branch flow path from the branch point to the manifold, each from the manifold to the junction A film extruder, wherein a thickness adjusting means for adjusting a thickness distribution in a die width direction of a layer corresponding to the channel is provided in the channel.
【請求項2】 押出系が2台の押出機で、ダイは3個の
マニホールドを備え、アダプタ手段は一方の押出機の流
路を2個に分岐する分岐流路と他方の押出機の流路を分
岐せずそのままとする単流路とを備え、一方の押出機の
分岐流路は夫々外側の層になるマニホールドに、他方の
押出機の単流路は中心層のマニホールドに接続し、両側
の表層が同じ樹脂からなる3層の積層フィルムを押出す
ようにした請求項1記載のフィルムの押出装置。
2. An extruder comprising two extruders, a die having three manifolds, and an adapter means for branching a flow path of one extruder into two and a flow path of the other extruder. With a single flow path that does not branch the path, the branch flow path of one extruder is connected to the manifold that becomes the outer layer, and the single flow path of the other extruder is connected to the center layer manifold, 2. The film extruder according to claim 1, wherein a three-layer laminated film having the same resin on both sides is extruded.
【請求項3】 前記流量調整手段が、流路断面積を変化
させて流量を調整するバルブである請求項1又は2に記
載のフィルムの押出装置。
3. The film extruder according to claim 1, wherein the flow rate adjusting means is a valve that adjusts a flow rate by changing a flow path cross-sectional area.
【請求項4】 前記バルブは、矩形断面の流路と、矩形
断面の幅とほぼ同じ半径の円柱からなり、その円周から
所定距離の弦まで矩形断面高さとほぼ同じ長さだけ削り
落とした流路面積調整部材とを備え、該流路面積調整部
材をその削除部分が流路内に位置するように流路の側壁
に側壁位置が回転中心になるように回転可能に設けたバ
ルブである請求項3に記載のフィルムの押出装置。
4. The valve has a rectangular cross section and a column having a radius substantially equal to the width of the rectangular cross section, and is cut down from the circumference to a chord of a predetermined distance by a length substantially equal to the height of the rectangular cross section. A flow path area adjusting member, wherein the flow path area adjusting member is rotatably provided on a side wall of the flow path such that the removed portion is located in the flow path such that the side wall position is the center of rotation. An apparatus for extruding a film according to claim 3.
【請求項5】 中心層の厚み調整手段が、流路の側壁を
薄肉厚部としたフレキシブルリップ方式であり、表層の
厚み調整手段が、流路の壁面温度を変化させる温度調整
方式である請求項1〜4に記載のいずれかのフィルムの
押出装置。
5. The thickness adjusting means of the central layer is a flexible lip method in which the side wall of the flow path has a thin wall portion, and the thickness adjusting means of the surface layer is a temperature adjusting method of changing the wall surface temperature of the flow path. Item 5. A film extruder according to any one of Items 1 to 4.
【請求項6】 請求項1〜5に記載のいずれかのフィル
ムの押出装置により積層フィルムとして押出してフィル
ムを製造するフィルムの製造方法。
6. A method for producing a film, wherein the film is extruded as a laminated film by a film extruder according to any one of claims 1 to 5.
【請求項7】 多層フィルムの各層の幅方向の平均厚み
及び厚み分布を測定し、その平均厚みの各測定値を各層
の流量調整手段にフィードバックし、その厚み分布の各
測定値を厚み調整手段にフィードバックして、各層の厚
み制御をする請求項6記載のフィルムの製造方法。
7. The average thickness and thickness distribution of each layer of the multilayer film in the width direction are measured, and the measured values of the average thickness are fed back to the flow rate adjusting means of each layer, and the measured values of the thickness distribution are measured by the thickness adjusting means. 7. The method for producing a film according to claim 6, wherein the thickness of each layer is controlled by feedback to the film.
【請求項8】 前記測定は、積層フィルムを各層に分離
した後の各単層フィルムにおいて測定する請求項7記載
のフィルムの製造方法。
8. The method for producing a film according to claim 7, wherein the measurement is performed on each single-layer film after separating the laminated film into each layer.
JP10308406A 1998-10-29 1998-10-29 Film extrusion device and manufacture of film Pending JP2000127227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10308406A JP2000127227A (en) 1998-10-29 1998-10-29 Film extrusion device and manufacture of film

Publications (1)

Publication Number Publication Date
JP2000127227A true JP2000127227A (en) 2000-05-09

Family

ID=17980686

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Application Number Title Priority Date Filing Date
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Country Link
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