JPH04214320A - Screw extruder - Google Patents
Screw extruderInfo
- Publication number
- JPH04214320A JPH04214320A JP2401562A JP40156290A JPH04214320A JP H04214320 A JPH04214320 A JP H04214320A JP 2401562 A JP2401562 A JP 2401562A JP 40156290 A JP40156290 A JP 40156290A JP H04214320 A JPH04214320 A JP H04214320A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- barrel
- length
- screw
- 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
Links
- 239000011347 resin Substances 0.000 claims abstract description 79
- 229920005989 resin Polymers 0.000 claims abstract description 79
- 238000002844 melting Methods 0.000 claims abstract description 39
- 230000008018 melting Effects 0.000 claims abstract description 39
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000013213 extrapolation Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 description 12
- 239000002994 raw material Substances 0.000 description 8
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 235000012438 extruded product Nutrition 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000000611 regression analysis Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、バレル内の溶融樹脂の
圧力分布を押出操業中に計測することができ、以て樹脂
の溶融長を算出できるスクリュ押出機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw extruder that is capable of measuring the pressure distribution of a molten resin within a barrel during extrusion operation, and thereby calculating the melting length of the resin.
【０００２】0002
【従来の技術】スクリュ押出機では、ホッパから導入さ
れた固体状原料は、バレルからの加熱とスクリュとバレ
ルの間のせん断作用により昇温し、ついには溶融する。
この樹脂の溶融長さ（以下、樹脂溶融長という）は、加
熱温度、スクリュ構造、スクリュ回転数等の種々の要因
により定まり、また、スクリュ回転数やフィーダの回転
数が一定でも、原料の温度、混練度、吸水の度合い等に
よってかさ比重が変わるため、樹脂溶融長は変化する。2. Description of the Related Art In a screw extruder, a solid raw material introduced from a hopper is heated by heating from a barrel and by shearing action between the screw and barrel, and is finally melted. The melting length of this resin (hereinafter referred to as resin melting length) is determined by various factors such as heating temperature, screw structure, and screw rotation speed.Also, even if the screw rotation speed and feeder rotation speed are constant, the temperature of the raw material Since the bulk specific gravity changes depending on the degree of kneading, degree of water absorption, etc., the resin melting length changes.
【０００３】そして、この樹脂溶融長は、長くなり過ぎ
ると押出機に過大な負荷がかかったり、ベント孔に溢流
してその孔を閉塞することにつながり、発泡不良などの
製品不良の問題ともなり、一方、樹脂溶融長が短くなり
過ぎると、押出製品の衝撃強度などの物性低下を惹起す
る。このように、樹脂溶融長の長短は、押出操業を円滑
に進め、押出製品の物性向上を図るため重要な意味を有
し、従って、樹脂溶融長を適切な範囲に制御することは
、押出成形においては非常に重要なことである。しかし
、従来は樹脂溶融長を押出操業中に測定する方法は存在
しなかった。[0003] If the resin melting length is too long, it may put an excessive load on the extruder, overflow into the vent hole and block it, and cause product defects such as poor foaming. On the other hand, if the resin melting length becomes too short, physical properties such as impact strength of the extruded product will deteriorate. In this way, the length of the resin melting length has an important meaning in order to proceed with extrusion operations smoothly and improve the physical properties of extruded products. Therefore, controlling the resin melting length within an appropriate range is important for extrusion This is extremely important. However, conventionally there has been no method for measuring resin melt length during extrusion operation.
【０００４】従来、樹脂溶融長を観測するには、押出機
を停止し、その後速やかにスクリュまたはバレルを抜き
去って、スクリュに付着した溶融樹脂を観測すると言う
方法が取られていた。また、バレルを縦割りに開くこと
が出来るようになっていて押出機停止後速やかに樹脂の
溶融状態を観測することが可能な押出機も知られている
（商品名：コ・ニーダー、Ｂｕｓｓ社（スイス））。
しかし、これらの方法乃至装置では、いずれにしても
操業中のバレル内の樹脂の挙動を観測することは出来な
い。Conventionally, in order to observe the resin melt length, the extruder was stopped, the screw or barrel was immediately removed, and the molten resin adhering to the screw was observed. There is also an extruder known that has a barrel that can be opened vertically so that the melted state of the resin can be observed immediately after the extruder has stopped (product name: Co-Kneader, Buss Co., Ltd.). (Switzerland)).
However, with these methods and devices, it is not possible to observe the behavior of the resin inside the barrel during operation.
【０００５】特開平１−２９５８１４号公報には、スク
リュ押出機またはスクリュ式射出成形機のバレルに観測
用のガラス窓を設け、内部の樹脂の溶融状態を観測可能
としている。しかし、このような方法を用い得るのは実
験用の成形機に対してだけであり、生産機に適用するこ
とは困難である。その理由の一つは、ガラスのような割
れやすい材料を、高温高圧下の苛酷な条件下で使用しな
ければならないことであり、第二の理由は、観測用窓を
設けることによって、その部分の外部からの加熱が出来
なくなり、不均一加熱を招く可能性があることである。
さらに観測用開口部におけるガラスと金属の境界には段
差が出来ることが多く、特に塩化ビニル系樹脂のような
熱安定性の悪い材料を使用する場合には、このような段
差部分に材料が滞留し、熱分解を起こす可能性が非常に
大きい。[0005] Japanese Patent Laid-Open No. 1-295814 discloses that a glass window for observation is provided in the barrel of a screw extruder or screw type injection molding machine, so that the molten state of the resin inside can be observed. However, such a method can only be used for experimental molding machines, and is difficult to apply to production machines. One of the reasons for this is that fragile materials such as glass must be used under harsh conditions of high temperature and pressure, and the second reason is that by providing an observation window, it is possible to heating from the outside may become impossible, leading to uneven heating. Furthermore, there is often a step at the boundary between glass and metal in the observation aperture, and especially when using materials with poor thermal stability such as vinyl chloride resin, material may accumulate in such steps. However, there is a very high possibility that thermal decomposition will occur.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、生産機を用
いて押出操業中に、生産上のトラブルを生ずることなく
、簡単かつ正確にバレル内の樹脂溶融長を計測出来るス
クリュ押出機を提供することを目的とし、更に、これを
適切な範囲に制御出来るスクリュ押出機を提供すること
を目的とする。[Problems to be Solved by the Invention] The present invention provides a screw extruder that can easily and accurately measure the resin melt length in the barrel during extrusion operation using the production machine without causing production troubles. It is an object of the present invention to provide a screw extruder that can control this within an appropriate range.
【０００７】[0007]
【課題を解決するための手段】本発明者は、以上の点を
考慮して種々検討した結果、バレル内の溶融樹脂の圧力
分布を求め、その圧力が零になる点を押出機上流側への
外挿によって求めると、この点からバレル先端までの長
さは、実際の樹脂溶融長と良く一致することを見出し、
本発明を完成した。[Means for Solving the Problems] As a result of various studies in consideration of the above points, the present inventor determined the pressure distribution of the molten resin in the barrel, and determined the point where the pressure becomes zero to the upstream side of the extruder. It was found that the length from this point to the barrel tip corresponds well to the actual resin melting length when calculated by extrapolation of
The invention has been completed.
【０００８】すなわち、発明１は、バレルの軸方向にバ
レル内の溶融樹脂の圧力値を出力する複数個の圧力セン
サを設けたスクリュ押出機であり、これにより軸方向の
溶融樹脂の圧力値分布が測定される。そして、発明２は
、上記押出機に、圧力センサから出力した圧力分布値を
外挿処理して樹脂溶融長を求める計算機能装置を付加す
ると共に、この計算機能装置から算出した樹脂溶融長が
設定範囲を外れた時発する警報装置を具備したことを特
徴としている。That is, invention 1 is a screw extruder equipped with a plurality of pressure sensors that output the pressure value of the molten resin in the barrel in the axial direction of the barrel, thereby controlling the pressure value distribution of the molten resin in the axial direction. is measured. Invention 2 adds a calculation function device to the extruder to obtain the resin melt length by extrapolating the pressure distribution value output from the pressure sensor, and the resin melt length calculated from this calculation function device is set. It is characterized by being equipped with an alarm device that sounds when it is out of range.
【０００９】また、発明３は、さらに計算機能装置から
算出した樹脂溶融長が設定範囲を外れた時、スクリュ回
転数を変化させることにより、樹脂溶融長を設定範囲に
戻すための制御装置を具備したことを特徴としている。
なお、スクリュ押出機で測定されるバレル内の樹脂圧力
は、スクリュ溝の部分とスクリュフライトの部分では異
なるし、また、スクリュ溝の測定値でも、スクリュの１
回転を周期として周期的に変化する。従って、ある特定
の圧力センサによる樹脂の圧力は、常にスクリュ溝上の
同じ点の値を測定するようにすることが好ましい。この
ため、スクリュの回転状態をエンコーダを用いて探知し
、常にスクリュ溝の同じ位置での圧力を測定し得るよう
配慮することが好ましい。[0009] Invention 3 further includes a control device for returning the resin melting length to the set range by changing the screw rotation speed when the resin melting length calculated by the calculation function device is out of the set range. It is characterized by what it did. Note that the resin pressure inside the barrel measured in a screw extruder differs between the screw groove and the screw flight, and the measured value for the screw groove also differs from the screw groove to the screw flight.
Changes periodically with rotation as a period. Therefore, it is preferable that the pressure of the resin by a certain pressure sensor is always measured at the same point on the screw groove. For this reason, it is preferable to detect the rotational state of the screw using an encoder so that the pressure at the same position in the screw groove can always be measured.
【００１０】また、本発明が適用できる押出機は、後述
の実施例で例示した２軸スクリュ押出機に止まるもので
はなく、シングルスクリュ押出機にも適用できるもので
ある。そして、ベント設備の有無は関係なしに本発明は
適用可能である。さらに、本発明の押出機において用い
られる原料も、押出可能でさえあれば、全ての合成樹脂
にわたるものである。[0010] Furthermore, the extruder to which the present invention can be applied is not limited to the twin screw extruder exemplified in the examples described later, but can also be applied to a single screw extruder. The present invention is applicable regardless of the presence or absence of vent equipment. Furthermore, the raw materials used in the extruder of the present invention include all synthetic resins as long as they can be extruded.
【００１１】[0011]
【作用】以上の構成により、発明１、２及び３は、下記
の作用を奏する。すなわち、発明１においては、軸方向
の溶融樹脂の圧力値分布が操業中に測定され、この測定
された軸方向の樹脂圧力値分布、すなわち測定圧力値対
バレル先端から押出機上流方向への長さの関係は、後述
する実施例に示されるように、多くの場合上流方向の右
下がりの直線となる。このような場合には、この直線を
押出機上流方向すなわち右方へ外挿することにより、圧
力零の点を求めることが出来、上記関係が曲線になる場
合でも、押出機上流側の数点の圧力センサによる圧力分
布が直線的となるので、この部分の外挿により、圧力零
の点を求めることが出来る。このようにして得られた圧
力零の点からバレル先端までの長さをもって樹脂溶融長
とすることができる。[Function] With the above configuration, inventions 1, 2, and 3 exhibit the following effects. That is, in invention 1, the pressure value distribution of the molten resin in the axial direction is measured during operation, and the measured resin pressure value distribution in the axial direction, that is, the measured pressure value vs. the length from the barrel tip to the upstream direction of the extruder. As shown in the examples described later, the relationship between the heights is often a straight line downward to the right in the upstream direction. In such a case, by extrapolating this straight line to the upstream direction of the extruder, that is, to the right, the point of zero pressure can be found. Even if the above relationship is a curve, several points upstream of the extruder can be found. Since the pressure distribution by the pressure sensor is linear, the point of zero pressure can be found by extrapolating this part. The length thus obtained from the point of zero pressure to the tip of the barrel can be taken as the resin melting length.
【００１２】そして、発明２においては、操業時に上記
樹脂溶融長が設定範囲を外れた時の警報により、押出の
異常を知ることが出来、押出操業上の不具合点や押出製
品の品質上の欠陥発生を早期に発見し、それらに対し、
樹脂溶融長を設定範囲内に戻すように操作条件を変更す
る等の対策を講ずることが可能となる。また、発明３に
おいては、制御装置により直接的にスクリュ回転数を変
化させて樹脂溶融長を上記設定範囲に戻すことを可能と
し、よって、樹脂溶融長の変化による押出操業上の不具
合や押出製品の品質不良を未然もしくは可及的速やかに
防止でき、無人運転の場合でも、常に安定した操業、安
定した品質が得られるようになる。[0012] In invention 2, abnormality in extrusion can be known by an alarm when the resin melt length is out of the set range during operation, and problems in extrusion operation or defects in quality of extruded products can be detected. Detect outbreaks early and take measures against them.
It becomes possible to take measures such as changing the operating conditions so as to return the resin melting length to within the set range. In addition, in invention 3, it is possible to return the resin melt length to the above-mentioned setting range by directly changing the screw rotation speed using the control device. It is possible to prevent quality defects in advance or as quickly as possible, and even in the case of unmanned operation, stable operation and stable quality can be obtained at all times.
【００１３】[0013]
【実施例】スクリュ押出機の構成
図１は、本発明に係わるスクリュ押出機の一実施例であ
る。この押出機は、２個のスクリュ１が互いに噛み合っ
てバレル２内に装着され、バレル２の中途にベント孔３
が設けられた、いわゆるベントタイプの２軸押出機Ａで
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a screw extruder according to the present invention. This extruder is installed in a barrel 2 with two screws 1 meshing with each other, and a vent hole 3 in the middle of the barrel 2.
This is a so-called vent type twin-screw extruder A equipped with a.
【００１４】ベント孔３より先端方向のバレル２に複数
個の圧力センサ４、４─が設けられ、各点において溶融
樹脂圧力を測定できるようになっている。この圧力セン
サ４、４─によって測定された圧力値は制御装置５に入
力され、制御装置５に内蔵されたコンピュータ（図示せ
ず）によって、測定された樹脂圧力対バレル先端から押
出機上流方向への長さの関係の回帰分析が行われて樹脂
溶融長が求められるようになっている。A plurality of pressure sensors 4, 4- are provided in the barrel 2 toward the tip of the vent hole 3, so that the pressure of the molten resin can be measured at each point. The pressure values measured by the pressure sensors 4, 4- are input to the control device 5, and a computer (not shown) built in the control device 5 calculates the measured resin pressure from the tip of the barrel to the upstream direction of the extruder. A regression analysis of the length relationship is performed to determine the resin melting length.
【００１５】また、この樹脂溶融長が設定範囲を外れた
時発する警報装置が備えられるか、樹脂溶融長が設定範
囲を外れた時、スクリュ回転数を変化させる制御装置が
具備されている。なお、６は制御装置５の表示部、７は
原料供給部、８は押出金型である。
成形例１
上記スクリュ押出機を用い、溶融樹脂原料としては硬質
塩化ビニル樹脂配合物を用い、その供給はスクリュフィ
ーダ７によって行った。溶融樹脂の圧力分布は圧力セン
サ４、４─によって測定され、制御装置５に入力され、
圧力値分布が表示部６に図２に示したような形に表示さ
れた。なお、図２の上部のスクリュ１と、バレル２に設
置された圧力センサとは、圧力値の測定位置関係を示し
ている。[0015] Furthermore, an alarm device is provided that issues an alarm when the resin melting length is out of a set range, or a control device is provided that changes the screw rotation speed when the resin melting length is out of a set range. In addition, 6 is a display part of the control device 5, 7 is a raw material supply part, and 8 is an extrusion mold. Molding Example 1 The above-mentioned screw extruder was used, and a hard vinyl chloride resin compound was used as the molten resin raw material, and the screw feeder 7 was used to supply the compound. The pressure distribution of the molten resin is measured by pressure sensors 4, 4--, and is input to the control device 5,
The pressure value distribution was displayed on the display unit 6 in the form shown in FIG. Note that the screw 1 in the upper part of FIG. 2 and the pressure sensor installed in the barrel 2 show a positional relationship for measuring pressure values.
【００１６】この圧力値は制御装置５において内蔵コン
ピータにより回帰分析され、その相関関係数０．９８〜
１．００で直線関係となり、その圧力零への外挿値が得
られ、樹脂溶融長が求められた。この計測された樹脂溶
融長から樹脂のかさ比重の変化など、原料の状態の変化
が推定され、より好適な押出条件を知ることができる。This pressure value is regression-analyzed by a built-in computer in the control device 5, and the correlation coefficient is 0.98~
A linear relationship was obtained at 1.00, and the extrapolated value to zero pressure was obtained, and the resin melting length was determined. From this measured resin melting length, changes in the state of the raw material, such as changes in the bulk specific gravity of the resin, can be estimated, and more suitable extrusion conditions can be determined.
【００１７】成形例２
スクリュ１’の計量部分形状が二つのゾーンに分けられ
、ベント孔を有していないスクリュ押出機であって、図
１の押出機と同様に圧力センサ、制御装置が具備された
押出機を用い、原料は成形例１と同じく硬質塩化ビニル
樹脂を使用して成形を行った。図３に示すとおり、それ
ぞれのゾーンにおいて圧力Ｐ１ 〜Ｐ６ を測定し、こ
れらの値を用いて回帰分析を行い、上流側の圧力分布を
外挿することにより、実施例１と同じようににして樹脂
溶融長を求めることが出来た。Molding Example 2 This is a screw extruder in which the shape of the metering part of the screw 1' is divided into two zones and does not have a vent hole, and is equipped with a pressure sensor and a control device like the extruder shown in FIG. Molding was carried out using the same extruder as in Molding Example 1, using hard vinyl chloride resin as the raw material. As shown in Figure 3, the pressures P1 to P6 are measured in each zone, regression analysis is performed using these values, and the pressure distribution on the upstream side is extrapolated in the same manner as in Example 1. We were able to determine the resin melting length.
【００１８】成形例３
スクリュ、バレル、圧力センサは実施例１と同じであっ
て、制御装置には警報装置が備えられ、樹脂溶融長が設
定した特定の範囲から外れた時、警報を発するようにな
っている押出機を用い、成形例１と同じ原料を使用して
成形を行った。この押出成形された硬質塩化ビニルパイ
プの落錘衝撃値は、樹脂溶融長が短くなると低下し、４
００ｍｍを切ると規格値４００ｍｍを切ってしまう。ま
た、ベント孔の位置は、バレル先端から５２５ｍｍの位
置にあり、ベント孔の閉塞を起こさないようにする為に
は、樹脂溶融長を５００ｍｍ以下とする必要があった。
従って樹脂溶融長の適切な範囲は４００〜５００ｍｍと
なる。これらの関係は図４に示したとおりであった。Molding Example 3 The screw, barrel, and pressure sensor are the same as in Example 1, and the control device is equipped with an alarm device to issue an alarm when the resin melting length deviates from a specified range. Molding was carried out using the same extruder as in Molding Example 1. The falling weight impact value of this extruded hard PVC pipe decreases as the resin melting length becomes shorter;
If it is less than 00mm, it will be less than the standard value of 400mm. Furthermore, the vent hole was located 525 mm from the tip of the barrel, and in order to prevent the vent hole from clogging, the resin melting length had to be 500 mm or less. Therefore, the appropriate range of resin melting length is 400 to 500 mm. These relationships were as shown in FIG.
【００１９】このような操業領域で押出成形を行うため
、制御ボックスの警報装置の下限値を４００ｍｍに、ま
た上限値を５００ｍｍに設定して運転を行った。このよ
うなシステムの採用により、押出操業中のベント孔の閉
塞は全くなくなり、また、落錘衝撃値の規格割れの問題
も解消した。
成形例４
成形例３で用いた押出機に、樹脂溶融長が操業範囲から
一定時間外れた場合、この制御装置からスクリュ駆動用
モータに信号が送られてスクリュ回転数を変化させる制
御機構を付与した押出機を用い、成形例１と同じ原料を
使用して成形を行った。In order to carry out extrusion molding in such an operating range, operation was carried out with the lower limit of the warning device of the control box set to 400 mm and the upper limit to 500 mm. By adopting such a system, there was no clogging of the vent holes during extrusion operations, and the problem of falling weight impact values falling outside the specifications was also resolved. Molding Example 4 The extruder used in Molding Example 3 is equipped with a control mechanism that changes the screw rotation speed by sending a signal from this control device to the screw drive motor when the resin melt length deviates from the operating range for a certain period of time. Molding was carried out using the same extruder as in Molding Example 1.
【００２０】樹脂溶融長は操業範囲に維持することがで
きた。スクリュ回転数と樹脂溶融長の相関は、図５に示
すように相関係数０． ９５〜１．００の逆相関であり
、この場合、１ｒｐｍ のスクリュ回転数の変化で樹脂
溶融長を３０ｍｍ変化させることが出来る。スクリュ回
転数変更のきざみは、０．５ｒｐｍ 、その変化の速度
は１ｒｐｍ ／分と設定した。[0020] The resin melt length was able to be maintained within the operating range. The correlation between the screw rotation speed and the resin melting length has a correlation coefficient of 0.0 as shown in FIG. This is an inverse correlation of 95 to 1.00, and in this case, a change in the screw rotation speed of 1 rpm can change the resin melting length by 30 mm. The step of changing the screw rotation speed was set to 0.5 rpm, and the speed of change was set to 1 rpm/min.
【００２１】上記した制御装置の採用により、操業上の
トラブルもなく、また品質的に優れた硬質塩化ビニルパ
イプを安定して生産することが出来た。By employing the above-mentioned control device, it was possible to stably produce hard vinyl chloride pipes of excellent quality without any operational troubles.
【００２２】[0022]
【発明の効果】本発明により、生産用押出機の操業中に
、生産を妨げることなく、バレル各位置における溶融樹
脂圧を測定出来、その測定結果から樹脂溶融長を計測で
きるようになった。その結果として、先ず第一に原料供
給量の変動を知り得るようになり、その対策を早めに打
つことが可能となった。According to the present invention, the pressure of the molten resin at each position of the barrel can be measured during the operation of the production extruder without interfering with production, and the resin melt length can be measured from the measurement results. As a result, it has become possible to know first of all fluctuations in the amount of raw materials supplied, and it has become possible to take countermeasures early on.
【００２３】また、発明２においては、樹脂溶融長が長
くなって、ベント孔が閉塞されそうになった場合も、そ
れを未然に知って対応することが出来るようになる。さ
らに樹脂溶融長とある特定の品質との相関が知れている
場合には、その特定の品質が規格値を割る値に対応する
樹脂溶融長を限界値とし、警報を発するなどして品質不
良を未然に防止し得るようになる。Furthermore, in the second aspect of the invention, even if the resin melting length becomes long and the vent hole is about to be clogged, it is possible to know this in advance and take appropriate measures. Furthermore, if the correlation between the resin melting length and a certain quality is known, the resin melting length corresponding to the value that the specific quality divides the standard value is set as the limit value, and an alarm is issued to prevent quality defects. It will be possible to prevent it from happening.
【００２４】その上、発明３においては、品質上、操業
上の限界値に対応する樹脂溶融長を設定値として制御装
置に入力し、この制御装置をスクリュ駆動装置につなげ
ることによりスクリュ回転数を変化させ、以て樹脂溶融
長を設定範囲内にコントロール出来、無人運転の場合で
も、常に安定した操業、安定した品質の押出製品が得ら
れる。Furthermore, in invention 3, the resin melting length corresponding to the limit value for quality and operation is inputted to the control device as a set value, and this control device is connected to the screw drive device to control the screw rotation speed. By changing the length, the resin melting length can be controlled within the set range, and even in unmanned operation, stable operation and extruded products of stable quality can be obtained.
【００２５】以上述べたように、本発明により従来知る
ことのできなかった押出機バレル内の樹脂の溶融挙動が
解明され、その結果得られた知見は押出機の操業の安定
化や押出製品の品質向上に資する所が非常に大きい。こ
のように本発明の工業的価値は極めて大きいものがある
。As described above, the present invention has clarified the melting behavior of the resin inside the extruder barrel, which was previously unknown, and the knowledge obtained as a result can be used to stabilize the operation of the extruder and improve the quality of extruded products. This greatly contributes to quality improvement. As described above, the industrial value of the present invention is extremely large.
【図１】本発明のスクリュ押出機の概略断面図である。FIG. 1 is a schematic cross-sectional view of a screw extruder of the present invention.
【図２】上記押出機のバレル内の溶融樹脂の樹脂圧力分
布値である。FIG. 2 shows resin pressure distribution values of the molten resin in the barrel of the extruder.
【図３】押出機の計量部のスクリュ形状が前半と後半で
違っている場合の樹脂圧力分布図である。FIG. 3 is a resin pressure distribution diagram when the screw shape of the measuring section of the extruder is different between the first half and the second half.
【図４】押出製品の落錘衝撃値と樹脂溶融長の関係を示
すグラフである。FIG. 4 is a graph showing the relationship between falling weight impact value and resin melting length of an extruded product.
【図５】スクリュ回転数の変化と樹脂溶融長の関係を示
すグラフである。FIG. 5 is a graph showing the relationship between changes in screw rotation speed and resin melting length.
１ 、１’ スクリュ ２ バレル ３ ベンド孔 ４ 圧力センサ ５ 制御装置 ６ 表示部 Ａ 押出機。 1, 1’ screw 2 Barrel 3 Bend hole 4 Pressure sensor 5 Control device 6 Display section A. Extruder.
Claims (3)
る複数個の圧力センサをバレルの軸方向に設けたことを
特徴とするスクリュ押出機。1. A screw extruder characterized in that a plurality of pressure sensors are provided in the axial direction of the barrel to output pressure values of molten resin within the barrel.
挿処理して、該バレル内の樹脂溶融長を求める計算機能
装置と、該樹脂溶融長が設定範囲を外れた時、警報を発
する警報装置とを具備したことを特徴とする請求項第１
項記載のスクリュ押出機。[Claim 2] A calculation function device that extrapolates the pressure value distribution of the molten resin in the barrel to determine the resin melting length in the barrel, and that issues an alarm when the resin melting length is out of a set range. Claim 1, characterized in that it is equipped with an alarm device.
Screw extruder as described in section.
挿処理して該バレル内の樹脂溶融長を求める計算機能装
置と、該樹脂溶融長が設定範囲を外れた時、スクリュ回
転数を変化させることにより、該樹脂溶融長を設定範囲
に戻すための制御装置とを具備したことを特徴とする請
求項第１項記載のスクリュ押出機。3. A calculation function device for calculating the resin melting length in the barrel by extrapolating the pressure value distribution of the molten resin in the barrel; The screw extruder according to claim 1, further comprising a control device for returning the resin melt length to a set range by changing the resin melt length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2401562A JPH04214320A (en) | 1990-12-12 | 1990-12-12 | Screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2401562A JPH04214320A (en) | 1990-12-12 | 1990-12-12 | Screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04214320A true JPH04214320A (en) | 1992-08-05 |
Family
ID=18511391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2401562A Pending JPH04214320A (en) | 1990-12-12 | 1990-12-12 | Screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04214320A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018066304A1 (en) * | 2016-10-07 | 2018-04-12 | 株式会社神戸製鋼所 | Screw extruder |
-
1990
- 1990-12-12 JP JP2401562A patent/JPH04214320A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018066304A1 (en) * | 2016-10-07 | 2018-04-12 | 株式会社神戸製鋼所 | Screw extruder |
| TWI641472B (en) * | 2016-10-07 | 2018-11-21 | 日商神戶製鋼所股份有限公司 | Screw extruder |
| CN109863011A (en) * | 2016-10-07 | 2019-06-07 | 株式会社神户制钢所 | Screw-type extruder |
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