JPH05200831A - Nozzle for extrusion - Google Patents

Nozzle for extrusion

Info

Publication number
JPH05200831A
JPH05200831A JP4013507A JP1350792A JPH05200831A JP H05200831 A JPH05200831 A JP H05200831A JP 4013507 A JP4013507 A JP 4013507A JP 1350792 A JP1350792 A JP 1350792A JP H05200831 A JPH05200831 A JP H05200831A
Authority
JP
Japan
Prior art keywords
thickness
slit
bolt
high frequency
molten 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.)
Pending
Application number
JP4013507A
Other languages
Japanese (ja)
Inventor
Yoshiaki Higuchi
喜明 樋口
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.)
Mitsubishi Plastics Inc
Original Assignee
Mitsubishi Plastics Inc
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 Mitsubishi Plastics Inc filed Critical Mitsubishi Plastics Inc
Priority to JP4013507A priority Critical patent/JPH05200831A/en
Publication of JPH05200831A publication Critical patent/JPH05200831A/en
Pending 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
    • B29C48/313—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections by positioning the die lips
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

Landscapes

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

Abstract

PURPOSE:To provide the nozzle for extruding a sheet which is provided with the thickness-regulating mechanism with quickly responding speed. CONSTITUTION:In the nozzle extruding molten resin into a thin film, a piezoelectric element 71 is fitted to the regulating bolt 6 provided on the lip 5 constituting a slit 4, and the piezoelectric element 71 is subjected to high frequency vibration by application of high frequency output, whereby high frequency vibration is applied to the slit. In the vibrating part, its friction coefficient between said part and the molten resin is decreased, and the amount of flowing out is increased, whereby the thickness of the sheet may be regulated. Consequently its responding speed is increased, and the quick thickness-regulation may be obtained, and further its mechanism becomes compact.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、溶融樹脂を薄膜状に押
出す口金の厚さ調整機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die thickness adjusting mechanism for extruding a molten resin into a thin film.

【０００２】[0002]

【従来の技術とその課題】溶融樹脂をフイルム、シート
ないし板状、あるいはチューブ状などの薄膜状に押出す
口金は、樹脂を吐出するスリットを有し、そのスリット
の間隙をリップ調整ボルトにより調整して製品の厚さを
均一にするようになっている。2. Description of the Related Art A die for extruding a molten resin into a film, sheet or plate, or a thin film such as a tube has a slit for discharging the resin, and the gap between the slits is adjusted by a lip adjusting bolt. The product thickness is made uniform.

【０００３】スリット調整機構としては、押引ボルトの
正逆回転によりスリットを構成するリップを変形させる
機械的機構が一般的であるが、この方式はオペレータの
習熟度の差が問題となり、また自動化が困難である。As the slit adjusting mechanism, a mechanical mechanism for deforming the lip forming the slit by rotating the push-pull bolts in the forward and reverse directions is generally used. However, this method has a problem of a difference in operator's proficiency level, and it is automated. Is difficult.

【０００４】そこで最近は、製品厚さの計測結果に基づ
いてスリット間隙を自動調整する口金として、ボルトを
加熱・冷却して、ボルトの熱膨脹差によりリップを所定
量変形させる、いわゆるヒートボルト方式のものが注目
されている。しかしこの方式も厚さ調整の応答速度が遅
く、また調整装置が大型になるという難点がある。Therefore, recently, as a die for automatically adjusting the slit gap based on the measurement result of the product thickness, a so-called heat bolt system is used in which a bolt is heated and cooled to deform a lip by a predetermined amount due to a difference in thermal expansion of the bolt. Things are receiving attention. However, this method also has a drawback that the response speed of the thickness adjustment is slow and the adjusting device becomes large.

【０００５】また、調整ボルトに圧電素子を組み込み、
圧電素子によりボルトを伸縮させる方式もあるが、必要
な調整量を得るために極めて多数の圧電素子を重ね合わ
せる必要があり、ボルトが極めて長くなるという問題が
ある。Further, a piezoelectric element is incorporated in the adjusting bolt,
There is also a method of expanding and contracting the bolt with a piezoelectric element, but there is a problem that the bolt becomes extremely long because it is necessary to stack a large number of piezoelectric elements in order to obtain a necessary adjustment amount.

【０００６】[0006]

【課題を解決するための手段】本発明は、従来のような
スリットの間隙調整ではなく、溶融樹脂と口金との摩擦
係数を変えることにより従来よりも大幅に応答速度が速
く、またコンパクトな厚さ調整機構を有する口金を提供
するものであって、溶融樹脂を薄膜状に押出す口金のス
リット部に、高周波振動素子を装着し、スリット部に高
周波振動を与えて厚さ調整を行なうことを特徴とする。According to the present invention, the response speed is significantly faster than the conventional one by changing the coefficient of friction between the molten resin and the die, rather than the conventional gap adjustment of the slit. The present invention provides a mouthpiece having a height adjusting mechanism, wherein a high-frequency vibrating element is attached to a slit portion of a die for extruding a molten resin into a thin film, and high-frequency vibration is applied to the slit portion to adjust the thickness. Characterize.

【０００７】以下本発明を詳しく説明する。図１は、本
発明口金の一例の断面図である。図１において、口金本
体１には、溶融樹脂が押出機（図略）より樹脂流入孔２
から供給され、マニホールド３にて幅方向に分配され、
樹脂流出スリット４よりフイルム・シート状に吐出され
る。口金本体１は、外面に配されたヒータ９、９により
一定温度に加熱される。The present invention will be described in detail below. FIG. 1 is a cross-sectional view of an example of the die of the present invention. In FIG. 1, molten resin is introduced into a main body 1 of a resin from an extruder (not shown) through a resin inlet 2
And distributed in the width direction in the manifold 3,
The film is discharged from the resin outflow slit 4 in the form of a film sheet. The base body 1 is heated to a constant temperature by the heaters 9 arranged on the outer surface.

【０００８】口金のスリット４を構成する２つのリップ
の内一方は、剛性が低く変形しやすいフレキシブルリッ
プ５となっており、他方は固定リップになっている。フ
レキシブルリップ５側には多数の調整ボルト６を配置す
る。各ボルト６の先端はリップ５外面に当設している。One of the two lips forming the slit 4 of the mouthpiece is a flexible lip 5 having low rigidity and easily deformed, and the other is a fixed lip. A large number of adjusting bolts 6 are arranged on the side of the flexible lip 5. The tip of each bolt 6 is provided on the outer surface of the lip 5.

【０００９】各調整ボルト６の途中には、複数個の圧電
素子７１、７１を重ね合わせた高周波振動素子７が組み
込まれており、パワーコントローラ８からの高周波出力
により個々の圧電素子７１が伸縮して調整ボルト６を振
動させるようになっている。このボルトの振動は、スリ
ット部、すなわちリップ５に伝達され、リップ５を樹脂
流れとほぼ直交方向に振動させる。A high-frequency vibrating element 7 in which a plurality of piezoelectric elements 71, 71 are superposed is incorporated in the middle of each adjusting bolt 6, and each piezoelectric element 71 expands and contracts by the high-frequency output from the power controller 8. The adjusting bolt 6 is caused to vibrate. The vibration of the bolt is transmitted to the slit portion, that is, the lip 5, and vibrates the lip 5 in a direction substantially orthogonal to the resin flow.

【００１０】厚さ調整にあたっては、まず調整ボルト６
を回転させて、概略の厚さ調整を行なう。ついで、押出
されたフイルム・シートなどの厚さを測定し、厚さの薄
い部分に対応する調整ボルト６に対し、高周波振動素子
７へパワーコントローラ８からの高周波出力を送って、
その部分のリップ５に高周波振動を与える。In adjusting the thickness, first the adjusting bolt 6
Rotate to make a rough thickness adjustment. Then, the thickness of the extruded film or sheet is measured, and the high frequency output from the power controller 8 is sent to the high frequency vibrating element 7 to the adjusting bolt 6 corresponding to the thin portion,
High frequency vibration is applied to the lip 5 at that portion.

【００１１】高周波振動の周波数は、振動部分の共振周
波数により異なるが、１０００〜５００００Ｈｚの範囲
が適当であり、また振幅は、修正しようとする厚さ偏差
に応じて、０．５〜５０μｍ程度の範囲とするのがよ
い。振幅は、重ね合わせる圧電素子７１の枚数で調整す
ることができる。The frequency of the high frequency vibration varies depending on the resonance frequency of the vibrating portion, but a range of 1000 to 50000 Hz is suitable, and the amplitude is about 0.5 to 50 μm depending on the thickness deviation to be corrected. It is good to set the range. The amplitude can be adjusted by the number of piezoelectric elements 71 to be overlapped.

【００１２】この振動により、溶融樹脂とスリット部の
口金内壁面との摩擦係数が低減し、その部分からの樹脂
の流出量が、振動を与えない場合よりも増加する。この
ようにして、振動を与えないときの流出量に対し１００
〜１２０％程度の範囲で流出量をコントロールすること
ができる。Due to this vibration, the coefficient of friction between the molten resin and the inner wall surface of the mouthpiece of the slit portion is reduced, and the outflow amount of the resin from that portion is increased as compared with the case where no vibration is applied. In this way, 100% of the outflow without vibration is applied.
The outflow rate can be controlled within the range of about 120%.

【００１３】本発明口金の厚さ調整の応答速度は１秒以
内と極めて速く、迅速な厚さ調整が可能になる。また、
従来の圧電素子により調整ボルトを伸縮させる方式で
は、必要な調整量を得るために極めて多数の圧電素子を
重ね合わせる必要があり、ボルトが極めて長くなるが、
本発明では、ボルトの伸縮ではなく微小な振動を利用す
るので、従来法に比べボルト長さを１／５程度にするこ
とができる。The response speed for adjusting the thickness of the die of the present invention is extremely fast within 1 second, which enables rapid thickness adjustment. Also,
In the conventional method of expanding and contracting the adjustment bolt with the piezoelectric element, it is necessary to stack a large number of piezoelectric elements in order to obtain the necessary adjustment amount, and the bolt becomes extremely long.
In the present invention, since the minute vibration is used instead of the expansion and contraction of the bolt, the bolt length can be reduced to about 1/5 as compared with the conventional method.

【００１４】かくして、本発明口金は、例えば、厚さ計
で計測されたシートの厚さデータをコンピュータで処理
して、各ボルト６毎の制御指令を出力させて目標厚さレ
ベルに制御する、いわゆる自動厚み制御口金としてシス
テム化し、自動運転することができる。また本発明は、
フラット状口金に限らず、チューブ状のシートなどを押
出す環状口金にも適用することができる。Thus, in the die of the present invention, for example, the thickness data of the sheet measured by the thickness gauge is processed by a computer, and a control command for each bolt 6 is output to control the target thickness level. It can be automatically operated by systemizing it as a so-called automatic thickness control die. Further, the present invention is
The present invention can be applied not only to the flat die but also to an annular die for extruding a tubular sheet or the like.

【００１５】[0015]

【発明の効果】本発明によれば、従来に比べ応答速度が
極めて速くなり、１秒以内の応答速度を得ることができ
る。また厚さ調整機構を極めてコンパクトにすることが
できる。According to the present invention, the response speed is much faster than the conventional one, and the response speed within 1 second can be obtained. Further, the thickness adjusting mechanism can be made extremely compact.

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

【図１】本発明口金の一例の断面図。FIG. 1 is a sectional view of an example of a mouthpiece of the present invention.

【符号の説明】[Explanation of symbols]

１ 口金本体 ４ スリット ５ リップ ６ 調整ボルト ７ 高周波振動素子 ７１ 圧電素子 ８ パワーコントローラ 1 Base Body 4 Slit 5 Lip 6 Adjustment Bolt 7 High Frequency Vibration Element 71 Piezoelectric Element 8 Power Controller

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 溶融樹脂を薄膜状に押出す口金のスリッ
ト部に、高周波振動素子を装着し、スリット部に高周波
振動を与えて厚さ調整を行なうことを特徴とする押出用
口金。1. An extrusion die, wherein a high-frequency vibrating element is attached to a slit portion of a die for extruding a molten resin into a thin film, and high-frequency vibration is applied to the slit portion to adjust the thickness.
JP4013507A 1992-01-29 1992-01-29 Nozzle for extrusion Pending JPH05200831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4013507A JPH05200831A (en) 1992-01-29 1992-01-29 Nozzle for extrusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4013507A JPH05200831A (en) 1992-01-29 1992-01-29 Nozzle for extrusion

Publications (1)

Publication Number Publication Date
JPH05200831A true JPH05200831A (en) 1993-08-10

Family

ID=11835057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4013507A Pending JPH05200831A (en) 1992-01-29 1992-01-29 Nozzle for extrusion

Country Status (1)

Country Link
JP (1) JPH05200831A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6398998B1 (en) * 1994-07-08 2002-06-04 3H Inventors Aps Method for producing bodies of consolidated particulate material
US7569173B2 (en) * 2000-01-24 2009-08-04 International Brain System S.A. Method and device for transforming crystalline or semicrystalline polymers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6398998B1 (en) * 1994-07-08 2002-06-04 3H Inventors Aps Method for producing bodies of consolidated particulate material
US7569173B2 (en) * 2000-01-24 2009-08-04 International Brain System S.A. Method and device for transforming crystalline or semicrystalline polymers

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