JPS62202712A - Method of extruding parison and its device - Google Patents

Method of extruding parison and its device

Info

Publication number
JPS62202712A
JPS62202712A JP60215957A JP21595785A JPS62202712A JP S62202712 A JPS62202712 A JP S62202712A JP 60215957 A JP60215957 A JP 60215957A JP 21595785 A JP21595785 A JP 21595785A JP S62202712 A JPS62202712 A JP S62202712A
Authority
JP
Japan
Prior art keywords
parison
extrusion
die
accumulation
cylinder rod
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.)
Granted
Application number
JP60215957A
Other languages
Japanese (ja)
Other versions
JPH0460405B2 (en
Inventor
Shuji Higo
肥後　修司
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.)
Kyoraku Co Ltd
Original Assignee
Kyoraku 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 Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Priority to JP60215957A priority Critical patent/JPS62202712A/en
Publication of JPS62202712A publication Critical patent/JPS62202712A/en
Publication of JPH0460405B2 publication Critical patent/JPH0460405B2/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
    • B29C48/03—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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • 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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/388—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a ram or piston
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92076—Position, e.g. linear or angular
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • B29C2948/92104—Flow or feed rate
    • 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
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/92409—Die; Nozzle zone
    • 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
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92466—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • 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

Abstract

PURPOSE:To enable the parison to obtain a precise thickness variation corresponding to a preset profile, by controlling an extrusion speed of resin in the vicinity of an outlet of a die at the time of extrusion of parison by changing a gap at the outlet of the die. CONSTITUTION:Synthetic resin loaded within an extrusion machine 4 is supplied through pressurization by a screw 8, melted through heating and accumulated within a chamber 2a. A vacuum cylinder rod 9 is moved backward according to accumulation and applied to a controller 15 by a position detector 17. When a signal is produced according to a preset profile, a valve 18 is actuated and a sliding speed of the vacuum cylinder 9 becomes fast at a position where a value of the preset profile is high, on the inside of the controller 15. When an extrusion speed of the synthetic resin is made fast by making the sliding speed of the vacuum cylinder rod 9 fast along with making the sliding speed of the vacuum cylinder rod 9 fast along with windening of a space between slits of a die 5 and core 6 by actuating a servocylinder 3 at the time of extrusion of a thick part, the diameter of parison can be made larger. The extrusion speed is measured by an extrusion speed detecting device 20 and a hydraulic cylinder 10 is controlled by applying feed back of the value to a controller 15.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、パリスンの押出方法及びその装置に関するも
ので、さらに詳しくはパリスンのダイ出口近傍の押出速
度を制御することにより設定プロファイルに応じた正確
な肉厚変化が得られかつ肉厚の差の大きいパリスンの押
出も可能なパリスンの押出方法及びその装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a parison extrusion method and apparatus, and more specifically, to an extrusion method and apparatus for extruding a parison, and more specifically, by controlling the extrusion speed near the die exit of the parison, accurate The present invention relates to a parison extrusion method and an apparatus for extruding parisons that can vary in wall thickness and can also extrude parisons with large differences in wall thickness.

従来技術 パリスンの押出技術として、パリスンを押出す際押出ヘ
ッドの出口付近でダイとコアの間隙（所謂スリット）を
変化させてパリスンの肉厚を変化させることが知られて
いる。一般にパリスンコントロールと呼ばれている。BACKGROUND ART As a parison extrusion technique, it is known to change the thickness of the parison by changing the gap between the die and the core (so-called slit) near the exit of an extrusion head when extruding the parison. Generally called parison control.

発明が解決しようとする問題点 ダイとコアのスリットを変化させる従来のパリスンコン
トロールでは、同一パリスンの短い部分で厚肉部分と薄
肉部分を形成することができなかった。つまり短い時間
で所望の肉厚に応じてスリットを変化させても、スリッ
トの調整だけでは、樹脂の流れを規制できないためであ
る。一般に単位時間当りの流量は、スリットの断面積と
流速との積である。そして断面積を急激に変化させると
流速が変化して所望の肉厚が得られなくなるのである。Problems to be Solved by the Invention With conventional parison control that changes the slits in the die and core, it is not possible to form thick and thin portions using short portions of the same parison. In other words, even if the slits are changed in accordance with the desired wall thickness in a short period of time, the flow of resin cannot be regulated just by adjusting the slits. Generally, the flow rate per unit time is the product of the cross-sectional area of the slit and the flow rate. If the cross-sectional area is suddenly changed, the flow velocity will change, making it impossible to obtain the desired wall thickness.

そこで、これらを是正するために、特開昭５４−１３３
５６２号公報、特開昭５６−９５６５０号公報の提案が
されている。Therefore, in order to correct these problems,
No. 562 and Japanese Unexamined Patent Publication No. 56-95650 have been proposed.

しかし、前者は、スリット間の圧力を検出してその変化
に応じてそのスリットを補正するものであるが、これに
於いてもスリットの変化のみで肉厚を規制するので上記
と同様急激な変化に対応することは困難であった。とく
に薄肉部分を押出す場合どうしても流速が早くなりスウ
ェルが発生して所望の肉厚を得ることができない。However, in the former method, the pressure between the slits is detected and the slit is corrected according to the change in pressure, but in this case, the wall thickness is regulated only by the change in the slit, so there is no sudden change as mentioned above. It was difficult to respond to the Particularly when extruding a thin walled portion, the flow velocity inevitably becomes high and swell occurs, making it impossible to obtain the desired wall thickness.

また後者は、パリスンとの肉厚の変化（公報中では重量
の変化と記載されている）を押出すごとにフィードバッ
クして押出機の回転数を微調整して所定の肉厚に調整し
ようとするものであるが、パリスン全体としてとらえシ
ョット毎の重量の変化をなくすことを目的とするもので
パリスン内の所望する各部分の肉厚を制御することがで
きず、厚肉部分と薄肉部分を有するパリスンを押出すこ
とはできない。In addition, the latter attempts to fine-tune the rotational speed of the extruder by feeding back changes in wall thickness (described as weight changes in the bulletin) each time it is extruded to achieve a predetermined wall thickness. However, the purpose is to consider the parison as a whole and eliminate the change in weight from shot to shot, and it is not possible to control the thickness of each desired part of the parison, and it is difficult to control the thickness of the thick and thin parts. It is not possible to extrude a parison that has

問題を解決するための手段及び作月 そこで本発明の製造方法は、 ダイ出口の間隙を変化させてパリスンを押出す際にダイ
出口付近の樹脂の押出速度を制御することを特徴とする
パリスンの押出方法としたことにより、パリスンの厚肉
部分はきわめて厚肉とすることができ、また逆に薄肉部
分は従来発生していたスウェルを取り除くことにより正
確に薄くすることができるので、同一パリスン内の縦方
向の短い距離の間で薄肉部分から厚肉部分へあるいは厚
肉部分から薄肉部分へ急激に変化させることが可能であ
る。Means for Solving the Problems and Production Method Accordingly, the manufacturing method of the present invention is characterized in that the extrusion speed of the resin near the die exit is controlled when extruding the parison by changing the gap at the die exit. By using the extrusion method, the thick parts of the parison can be made extremely thick, and conversely, the thin parts can be thinned accurately by removing the swell that occurs in the past. It is possible to make an abrupt change from a thin section to a thick section or from a thick section to a thin section over a short longitudinal distance.

また本方法に利用する装置として、 樹脂を貯留して押出すアキューム部分とダイとコアマン
ドレルとの軸線方向の相対的位置を変化させてダイとコ
アとのスリットを変化させる部分とを有するパ、リスン
の押出装置において、上記ダイとコアとのスリットを変
化させる部分が コアマンドレルを摺動させるサーボシリンダーと コアマンドレルの位置を検出する検出器とサーボシリン
ダーを制御する弁と 弁を制御する信号を出力する制御系と より構成され、 かつ上記アキューム部分が 樹脂を押出すアキュームシリンダーと アキュームシリンダーのシリンダーロッドの位置を検出
する検出器と アキュームシリンダーロッドを摺動させる油圧駆動部と 油圧駆動部を制御する弁と この弁を制御する制御系と より構成され、アキュームシリンダーロッドの位置を検
出する検出器からの信号に応じて予め設定されたプロフ
ァイルを与えるコントローラーがそれぞれプロファイル
に応じた信号をダイとコアとのスリットを変化させる部
分の制御系とアキューム部分の制御系へ入力することと
したパリスンの押出装置。The apparatus used in this method includes a pump having an accumulation part for storing and extruding resin, and a part for changing the relative position of the die and core mandrel in the axial direction to change the slit between the die and the core. In Listen's extrusion device, the part that changes the slit between the die and the core has a servo cylinder that slides the core mandrel, a detector that detects the position of the core mandrel, a valve that controls the servo cylinder, and a signal that controls the valve. It is composed of a control system that outputs an output, and the above-mentioned accumulation part controls an accumulation cylinder that extrudes resin, a detector that detects the position of the cylinder rod of the accumulation cylinder, a hydraulic drive unit that slides the accumulation cylinder rod, and a hydraulic drive unit. The control system consists of a valve that controls the valve, and a control system that controls the valve.The controller provides a preset profile according to the signal from the detector that detects the position of the accumulation cylinder rod, and the controller sends signals corresponding to the profile to the die and core. A parison extrusion device that inputs input to the control system of the part that changes the slit and the control system of the accumulation part.

としたことにより、ダイとコアとのスリットを変化させ
てパリスンの肉厚を制御する機構とアキュームシリンダ
ーのシリンダーロッドの摺動とを同期させることができ
シリンダーロッドの摺動速度を制御することにより肉厚
を容易に制御できる。By doing this, the mechanism that controls the wall thickness of the parison by changing the slit between the die and the core can be synchronized with the sliding movement of the cylinder rod of the accumulation cylinder.By controlling the sliding speed of the cylinder rod, Wall thickness can be easily controlled.

またアキュームシリンダーを利用することにより流速を
急激にかつ敏速に反応できるのである。Also, by using an accumulation cylinder, it is possible to react rapidly and quickly to the flow rate.

実施例 本発明を図面に基づき説明する。１は押出類、２はアキ
ュームレーターである。押出類１の中心には上下に摺動
可能なシリンダーロフト７を有し、このシリンダーロッ
ド７の下端には円錐台状のコア６を備え、このコア６を
とりまくように押出類１の下端にダイ５を有する。シリ
ンダーロッド７の上方にはサーボシリンダー３を形成し
てシリンダーロッド７を上下に摺動させることができる
。EXAMPLE The present invention will be explained based on the drawings. 1 is an extruder, and 2 is an accumulator. The center of the extrusion 1 has a cylinder loft 7 that can slide up and down, and the lower end of this cylinder rod 7 is equipped with a truncated conical core 6. It has die 5. A servo cylinder 3 is formed above the cylinder rod 7 so that the cylinder rod 7 can be slid up and down.

アキュームレーター２にはそのチャンバー２ａ内に溶融
混練した樹脂を送り込む押出機４及びスクリュウ８を有
する。アキュームレーター２は、チャンバー２ａの内容
量を変化させるアキュームシリンダーロッド９を有し、
そのアキュームシリンダーロット９の一方端には油圧シ
リンダー１０を形成してアキュームシリンダーロッド９
を摺動させる。シリンダーロッド７にはその位置を検出
する検出器１１を有しシリンダーロッド７の位置を制御
系１２に入力する。アキュームシリンダーロッド９の後
端にはアキュームシリンダーロッド９の位置を検出す之
検出器１７を有しその位置をコントローラ１５へ入力す
る。コントローラー１５では予め設定された所望のプロ
ファイルに従って検出器１７より入力されたアキューム
シリンダーロッド９の位置とその比較で制御系１２．１
６へ出力し、制御系１２．１６にて、制御及び増巾され
た命令をサーボシリンダー３及び油圧シリンダー１０の
油圧系統を制御する弁１３．１８へ伝える。ダイ出口近
傍には、パリスンの押出速度を測定する押出速度検出手
段２０を有する。押出速度検出手段２０は、マーカー２
１とマーク検出素子２２とより成り、マーカー２１より
一定時間の間隔でマークを付し、マーク検出素子２２に
てそのマーク通過時間を測定し、コントローラー１５ヘ
フイードバツクする。The accumulator 2 has an extruder 4 and a screw 8 for feeding melted and kneaded resin into its chamber 2a. The accumulator 2 has an accumulation cylinder rod 9 that changes the internal capacity of the chamber 2a,
A hydraulic cylinder 10 is formed at one end of the accumulation cylinder rod 9.
slide. The cylinder rod 7 has a detector 11 for detecting its position, and the position of the cylinder rod 7 is input to a control system 12. The rear end of the accumulation cylinder rod 9 has a detector 17 for detecting the position of the accumulation cylinder rod 9, and inputs the position to the controller 15. The controller 15 compares the position of the accumulation cylinder rod 9 input from the detector 17 according to a preset desired profile and controls the control system 12.1.
6, and the control system 12.16 transmits the control and amplified command to the valve 13.18 that controls the hydraulic system of the servo cylinder 3 and the hydraulic cylinder 10. Near the die exit, there is an extrusion speed detection means 20 for measuring the extrusion speed of the parison. The extrusion speed detection means 20 has a marker 2
1 and a mark detection element 22, marks are attached from the marker 21 at regular time intervals, the mark passing time is measured by the mark detection element 22, and feedback is sent back to the controller 15.

なお、押出速度検出手段２０は、非接触による検出手段
を利用することも可能である。このようにすればパリス
ンにマークを打つことなく検出できる。In addition, the extrusion speed detection means 20 can also utilize a non-contact detection means. In this way, the parison can be detected without marking it.

本発明の製造方法を説明する。原料供給口（図示せず）
より押出機４内に投入された合成樹脂はスクリュウ８に
て加圧供給されるにつれて加熱溶融されチャンバー２ａ
内に供給され貯留される。The manufacturing method of the present invention will be explained. Raw material supply port (not shown)
The synthetic resin fed into the extruder 4 is heated and melted as it is supplied under pressure by the screw 8, and then transferred to the chamber 2a.
It is supplied and stored within.

この時アキュームシリンダーロッド９は貯留にしたがっ
て後退する。アキュームシリンダーロフト９の位置は位
置検出器１７によりコントローラー１５へ入力される。At this time, the accumulation cylinder rod 9 moves back according to the storage. The position of the accumulation cylinder loft 9 is input to the controller 15 by a position detector 17.

樹脂がチャンバー２ａ内に貯留され、アキュームシリン
ダーロッド９が予め設定された位置まで後退すると、コ
ントローラー１５より出力された信号により制御系１６
．１２が働き、弁１８．１３が作動する。コントローラ
ー１５内では、予め設定された出力のプロファイルに従
って信号が出力される。この信号は、アキュームシリン
ダーロッド９の位置信号（つまりコントローラー１５内
の横向きの直線）に応じた設定プロファイル（つまり図
中コントローラー１５内の波線）の高さの値が出力され
る。この信号に応じて弁１８が作動し、管１９ａを通じ
て送られる油圧が制御され、設定プロファイルが高い値
の位置ではアキュームシリンダーロッド９の摺動速度が
早くなり、逆に設定プロファイルが低い値を示す位置で
は、アキュームシリンダーロッド９の摺動速度がおそく
なる。またこの弁１８の動きと同期してシリンダーロフ
ト７が作動する。このシリンダーロッド７は位置検出器
１１でその位置を制御系１２へ絶えずフィードバックし
てコントローラー１５の設定プロファイルの値に応じた
位置を示しているかどうか確認をしながら弁１３へ信号
を送り、サーボシリンダー３を作動させる。このように
厚肉部分を押出す際にサーボシリンダーを作動させてダ
イとコアのスリットの間隔を広げるとともにアキューム
シリンダーロッド９の摺動速度を速くして合成樹脂の押
出速度を速くすると、せん断速度が高くなってパリスン
の径をより大きくすることができる。これを一般にスウ
エルと呼んでいる。スウェルの機構について多くの研究
がされているが現在のところ明確に解明されいない。一
般に流動する間に受ける弾性的変形によるものと信じら
れており、実際にせん断速度の増加とともにスウェルが
大きくなることがわかっている。アキュームレーターに
よる押出速度は、急激に変化させることが可能であるの
で、せん断速度の変化によりスウェルを発生させてスリ
ットに対応するパリスンの肉厚以上の厚肉のパリスンを
押出すことかできる。そこで求めるパリスンの最高肉厚
をｔ１最低肉厚をｔ、とじたときの、パリスンの肉厚ｔ
を与えるパリスン押出速度Ｖはパリスンが厚肉である場
合、 ここで、ｖ、ｖはパリスンの平均肉厚の押出時の押出速
度、ｖｐは樹脂の粘性によって決定される定数である。When the resin is stored in the chamber 2a and the accumulation cylinder rod 9 is retracted to a preset position, the control system 16 is activated by a signal output from the controller 15.
．． 12 is activated and valves 18.13 are actuated. Within the controller 15, signals are output according to a preset output profile. This signal outputs the height value of the set profile (ie, the wavy line in the controller 15 in the figure) according to the position signal of the accumulation cylinder rod 9 (ie, the horizontal straight line in the controller 15). In response to this signal, the valve 18 is actuated to control the hydraulic pressure sent through the pipe 19a, and the sliding speed of the accumulation cylinder rod 9 becomes faster when the setting profile is at a high value, and conversely when the setting profile is at a low value. In this position, the sliding speed of the accumulation cylinder rod 9 is slow. Furthermore, the cylinder loft 7 operates in synchronization with the movement of the valve 18. This cylinder rod 7 constantly feeds back its position to the control system 12 using a position detector 11, and sends a signal to the valve 13 while checking whether the position corresponds to the value of the setting profile of the controller 15. Activate 3. In this way, when extruding a thick part, the servo cylinder is operated to widen the gap between the slits between the die and the core, and the sliding speed of the accumulation cylinder rod 9 is increased to increase the extrusion speed of the synthetic resin, which increases the shear speed. becomes higher and the diameter of the parison can be made larger. This is generally called a swell. A lot of research has been done on the mechanism of swell, but it is not clearly elucidated at present. It is generally believed that this is due to the elastic deformation experienced during flow, and it has been found that swell actually increases as the shear rate increases. Since the extrusion speed by the accumulator can be changed rapidly, it is possible to generate a swell by changing the shear rate and extrude a thicker parison than the thickness of the parison corresponding to the slit. The maximum wall thickness of the parison to be found is t, the minimum wall thickness is t, and the wall thickness of the parison is t.
When the parison is thick, the parison extrusion speed V that gives the following equation is: where v and v are extrusion speeds when extruding the average thickness of the parison, and vp is a constant determined by the viscosity of the resin.

尚押出速度は押出速度検出手段２０により測定し、この
値をコントローラー１５にフィートバックして油圧シリ
ンダー１０を制御する。The extrusion speed is measured by the extrusion speed detection means 20, and this value is fed back to the controller 15 to control the hydraulic cylinder 10.

以上は、パリスンが厚肉の場合について述べたが、次に
パリスンが薄肉の場合について述べる。The case where the parison is thick has been described above, but next, the case where the parison is thin will be described.

スウェルは、同じ流速の場合、スリットの断面積の変化
によっても発生する。流速を一定にしてもスリットが小
さくなったことによりパリスンの肉厚を抑えることはで
きず、パリスンの肉厚を急激に薄肉化させる場合の障害
となっていた。実施例は、スウェルが発生しないように
、あるいはさらに進んで逆スウェル（ダイとコアで形成
されたスリット形状よりも小さいパリスンを押出すこと
）を形成させるものである。このときのパリスンの押出
変速度Ｖは、 で与えられる。Swell also occurs due to a change in the cross-sectional area of the slit for the same flow rate. Even if the flow velocity was kept constant, the thickness of the parison could not be suppressed due to the smaller slit, which was an obstacle in rapidly reducing the thickness of the parison. In the embodiment, swell does not occur, or even further, a reverse swell (extruding a parison smaller than the slit shape formed by the die and core) is formed. The extrusion speed V of the parison at this time is given by:

このような押出しを行うと、スウェルが必要な厚肉部分
はスウェルが得られ、逆にスウェルが発生するために肉
厚制御を阻害されていた薄肉部分ではスウェルを抑さえ
あるいは逆スウェルにより逆に薄肉化がはかられるとい
う特別の効果を期待することができる。By performing such extrusion, swell can be obtained in thick-walled areas that require swell, and conversely, swell can be suppressed or reversed in thin-walled areas where wall thickness control has been inhibited due to swell. A special effect of thinning can be expected.

向上記実施例では肉厚部分は早く押出し、薄肉部分は遅
く押出したが、本発明はこれに限定されない。本発明の
目的を達成するには押出速度を一定にした場合も充分達
成できるものである。In the above-mentioned embodiment, the thick portion was extruded quickly and the thin portion was extruded slowly, but the present invention is not limited to this. The objects of the present invention can also be sufficiently achieved by keeping the extrusion speed constant.

発明の効果 本発明方法によれば、ダイ出口の押出速度を制御するの
でパリスン全体としてｌショット、１シヨツト１各に重
量を均一にできるばかりでなくスリットの変化にともな
う押出速度の変化により発生していた肉厚のバラツキに
対応できる。さらに特に厚肉部分と薄肉部分を正確に押
出すことが可能となった。Effects of the Invention According to the method of the present invention, since the extrusion speed at the exit of the die is controlled, it is possible not only to make the weight uniform for each shot and one shot for the entire parison, but also to prevent the weight from changing due to changes in the extrusion speed due to changes in the slit. It can accommodate variations in wall thickness. Furthermore, it has become possible to extrude particularly thick and thin parts accurately.

本発明装置によれば、アキュームシリンダーロッドによ
り押出すので押出速度を急激に変化させあるいは制御す
ることが可能である。ダイとコアとのスリットの変化に
よる合成樹脂の流速の変化を、スリットの変化と同期し
て改善できるのでパリ、スンの肉厚を正確にかつ短時間
で変えることが可能である。According to the apparatus of the present invention, since extrusion is performed using an accumulation cylinder rod, it is possible to rapidly change or control the extrusion speed. Changes in the flow velocity of the synthetic resin due to changes in the slits between the die and the core can be improved in synchronization with changes in the slits, making it possible to change the thickness of the edges and ends accurately and in a short time.

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

第１図は本発明の実施例に係る説明図、第２図は本発明
により得られたパリスンの一部断面図である。 １・・・押出類　２・・・アキュームレイター３・・・
サーボシリンダー　５・・・ダイ６・・・コア　　７・
・・シリンダーロフト−９・・・アキュームシリンダー
ロッド１０・・・油圧シリンダー １１．１７　・・・位置検出器　１２．１６　・・・制
御系１３、１８　　・・・弁１５・・・コントローラー
２０・・・押出速度検出手段FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is a partial sectional view of a parison obtained by the present invention. 1... Extrusion type 2... Accumulator 3...
Servo cylinder 5...Die 6...Core 7.
...Cylinder loft-9...Accumulation cylinder rod 10...Hydraulic cylinder 11.17...Position detector 12.16...Control system 13, 18...Valve 15...Controller 20...・Extrusion speed detection means

Claims (2)

【特許請求の範囲】[Claims] （１）ダイ出口の間隙を変化させて押出すパリスンの押
出方法において、パリスンの押出時にダイ出口付近の樹
脂の押出速度を制御することを特許とするパリスンの押
出方法。(1) A parison extrusion method in which the parison extrusion method is performed by changing the gap at the die exit, and the parison extrusion method is patented in that the extrusion speed of the resin near the die exit is controlled during extrusion of the parison. （２）樹脂を貯留して押出すアキューム部分とダイとコ
アマンドレルとの軸線方向の相対的位置を変化させてダ
イとコアとのスリットを変化させる部分とを有するパリ
スンの押出装置において、上記ダイとコアとのスリット
を変化させる部分が コアマンドレルを摺動させるサーボシリンダーと コアマンドレルの位置を検出する検出器と サーボシリンダーを制御する弁と 弁を制御する信号を出力する制御系と より構成され、 かつ上記アキューム部分が 樹脂を押出すアキュームシリンダーと アキュームシリンダーのシリンダーロッドの位置を検出
する検出器と アキュームシリンダーロッドを摺動させる油圧駆動部と 油圧駆動部を制御する弁と この弁を制御する制御系と より構成され、アキュームシリンダーロッドの位置を検
出する検出器からの信号に応じて予め設定されたプロフ
ァイルを与えるコントローラーがそれぞれプロファイル
に応じた信号をダイとコアとのスリットを変化させる部
分の制御系とアキューム部分の制御系へ入力することを
特徴とするパリスンの押出装置。(2) In a parison extrusion device having an accumulation part for storing and extruding resin and a part for changing the relative position of the die and core mandrel in the axial direction to change the slit between the die and the core, the above-mentioned die The part that changes the slit between the core and the core consists of a servo cylinder that slides the core mandrel, a detector that detects the position of the core mandrel, a valve that controls the servo cylinder, and a control system that outputs a signal that controls the valve. , and an accumulation cylinder through which the accumulation part extrudes resin, a detector for detecting the position of the cylinder rod of the accumulation cylinder, a hydraulic drive section for sliding the accumulation cylinder rod, a valve for controlling the hydraulic drive section, and a valve for controlling the valve. The control system consists of a controller that gives a preset profile according to a signal from a detector that detects the position of the accumulation cylinder rod, and a controller that sends a signal according to the profile to the part that changes the slit between the die and core. A parison extrusion device characterized by input to the control system and the control system of the accumulation part.
JP60215957A 1985-09-28 1985-09-28 Method of extruding parison and its device Granted JPS62202712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60215957A JPS62202712A (en) 1985-09-28 1985-09-28 Method of extruding parison and its device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60215957A JPS62202712A (en) 1985-09-28 1985-09-28 Method of extruding parison and its device

Publications (2)

Publication Number Publication Date
JPS62202712A true JPS62202712A (en) 1987-09-07
JPH0460405B2 JPH0460405B2 (en) 1992-09-28

Family

ID=16681042

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60215957A Granted JPS62202712A (en) 1985-09-28 1985-09-28 Method of extruding parison and its device

Country Status (1)

Country Link
JP (1) JPS62202712A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04361018A (en) * 1991-06-07 1992-12-14 Ube Ind Ltd Blow molding machine
JPH1110721A (en) * 1997-06-25 1999-01-19 Kishimoto Akira Method and apparatus for controlling thickness of parison
JP2006205746A (en) * 2006-05-11 2006-08-10 Tahara:Kk Blow molding method
JP2006519719A (en) * 2003-03-04 2006-08-31 デイビス − スタンダード コーポレイション Controller and method for bypassing a pressure reducing valve in a blow molding machine
US10035290B2 (en) 2012-12-11 2018-07-31 Kautex Maschinenbau Gmbh Extrusion blow-molding method and device for the performance thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5842437A (en) * 1981-09-08 1983-03-11 Ishikawajima Harima Heavy Ind Co Ltd Method of controlling distribution of sectional area of parison for blow molding

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5842437A (en) * 1981-09-08 1983-03-11 Ishikawajima Harima Heavy Ind Co Ltd Method of controlling distribution of sectional area of parison for blow molding

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04361018A (en) * 1991-06-07 1992-12-14 Ube Ind Ltd Blow molding machine
JPH1110721A (en) * 1997-06-25 1999-01-19 Kishimoto Akira Method and apparatus for controlling thickness of parison
JP2006519719A (en) * 2003-03-04 2006-08-31 デイビス − スタンダード コーポレイション Controller and method for bypassing a pressure reducing valve in a blow molding machine
KR101132511B1 (en) * 2003-03-04 2012-04-03 데이비스-스탠다드, 엘엘씨 A controller for bypassing a presure-reducing valve in a blow-molding machine and method thereof
JP2006205746A (en) * 2006-05-11 2006-08-10 Tahara:Kk Blow molding method
JP4511492B2 (en) * 2006-05-11 2010-07-28 株式会社タハラ Blow molding method
US10035290B2 (en) 2012-12-11 2018-07-31 Kautex Maschinenbau Gmbh Extrusion blow-molding method and device for the performance thereof

Also Published As

Publication number Publication date
JPH0460405B2 (en) 1992-09-28

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