JPH02231122A - Detection of vent of vent extruder - Google Patents

Detection of vent of vent extruder

Info

Publication number
JPH02231122A
JPH02231122A JP1052504A JP5250489A JPH02231122A JP H02231122 A JPH02231122 A JP H02231122A JP 1052504 A JP1052504 A JP 1052504A JP 5250489 A JP5250489 A JP 5250489A JP H02231122 A JPH02231122 A JP H02231122A
Authority
JP
Japan
Prior art keywords
vent
temperature
molten resin
detection
detecting
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
JP1052504A
Other languages
Japanese (ja)
Inventor
Kunio Takeuchi
邦夫 竹内
Tadaaki Yoshinaka
吉中 忠明
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.)
Toyobo Co Ltd
Original Assignee
Toyobo 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 Toyobo Co Ltd filed Critical Toyobo Co Ltd
Priority to JP1052504A priority Critical patent/JPH02231122A/en
Publication of JPH02231122A publication Critical patent/JPH02231122A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent deterioration in detection response properties, since molten resin is not solidified even if the same is stuck to a temperature detecting sensor by detecting vent-up and taking treatment such as an alarm or a change of an operation condition, by a method wherein the inside of a deaerating part of a vent extruder is heat-controlled at a temperature higher than a molten resin temperature and a detecting temperature of a temperature sensor for vent-up detection provided within the deaerating part is declined. CONSTITUTION:Molten resin on the inside of a cylinder 2 is transferred to the left from the right by a screw 3 and a jacket 4 is controlled at a higher temperature than that of molten resin by a temperature sensor 5. A temperature sensor 6 for vent-up detection detects a temperature of a vent part 8. When vent-up is generated, raised molten resin 9 comes into contact with a tip detecting part. A vent-up detecting signal is sent out by detecting that a detecting temperature of the temperature sensor 6 is declined lower than that of the vent part and instructions such as an alarm or a change of an operation condition are issued. Since the vent part 8 is kept heated at the melting temperature of the resin or higher, even if the molten resin is stuck to a detecting part of the tip of the temperature sensor 6, the stuck resin is not solidified and detection response properties are not deteriorated.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はベント押出機のベントアップを早期に検出し、
警報や運転条件変更などの処置を構ずることによりトラ
ブルを未然に防ぐためのベントアップ検出装置に関する
ものである。
[Detailed description of the invention] (Industrial application field) The present invention detects vent-up of a vent extruder at an early stage,
The present invention relates to a vent-up detection device for preventing troubles by taking measures such as issuing an alarm or changing operating conditions.

(従来の技術及び発明が解決しようする問題点)溶融樹
脂に含まれる揮発分や水分を除去するベント押出機は真
空ポンプにより負圧伏態とされる1個または複数個のベ
ント部を有している。このようなベント押出機では溶融
樹脂がベント部に盛り上がり最悪の場合はベント部の脱
気配管を封鎖して脱気能力を不能にしてしまうベントア
ップと呼ばれるトラブルが発生することがある。
(Problems to be Solved by the Prior Art and the Invention) A vent extruder for removing volatile matter and moisture contained in molten resin has one or more vent parts that are kept under negative pressure by a vacuum pump. ing. In such a vent extruder, a problem called vent-up may occur, in which the molten resin bulges in the vent section and, in the worst case, blocks the degassing piping of the vent section and disables the degassing ability.

このベントアップが発生すると脱気能力が無くなり押出
製品の品質が低下するだけでなくベントアップが無くな
っても脱気能力が回゜復せず押出機を停止してベント部
の付着樹脂を除去せねばならず生産性を著しく低下させ
ることになるためベントアップを早期に検出する方法が
必要とされる。
When this vent-up occurs, not only does the degassing capacity disappear and the quality of the extruded product deteriorates, but also the degassing capacity does not recover even if the vent-up disappears, making it necessary to stop the extruder and remove the resin adhering to the vent area. A method for detecting vent-up at an early stage is needed, as this will significantly reduce productivity.

従来のベントアップ検出方法としてはベント部にレベル
スイッチを設け、上昇してきた樹脂がこのレベルスイッ
チに接触することを検出する方法がある。しかし、レベ
ルスイッチを用いたベントアップ検出方法は一度溶融樹
脂が付着してベントアップを検出すると、溶融樹脂の付
着により検出条件が変化し、ベント7ツブの検出毎に付
着樹脂を除去する必要が有り、生産性を低下するととも
に検出信頼度の点でも問題があった。
As a conventional vent-up detection method, there is a method in which a level switch is provided in the vent section and it is detected that the rising resin comes into contact with the level switch. However, in the vent-up detection method using a level switch, once molten resin adheres and vent-up is detected, the detection conditions change due to the adhesion of molten resin, and it is necessary to remove the adhered resin every time 7 vents are detected. However, there were problems in terms of detection reliability as well as lower productivity.

別のベントアップ検出方法としては実開昭55−102
523号公報に示されるようなベント部ニ温度センサー
を設けベントアップが発生した時は温度センサーに溶融
樹脂が接触し、温度センサーが検出する温度変化によっ
てベントアップを検出するものである。しかしながら、
へ冫ト部に単に温度センサーを設ける方法では一度溶融
樹脂が付着してベントアップを検出すると前記レベルス
イッチを用いたベントアップ検出方法と同様の欠点を有
している。
Another vent-up detection method is
A temperature sensor is provided in the vent section as shown in Japanese Patent No. 523, and when vent-up occurs, molten resin comes into contact with the temperature sensor, and vent-up is detected based on the temperature change detected by the temperature sensor. however,
The method of simply providing a temperature sensor at the bottom part has the same drawbacks as the vent-up detection method using a level switch, once molten resin adheres to the vent-up detection method.

また別のベントアップ検出方法として特公昭62−54
855号公報に示されるような、ベント押出機のシリン
ダ内の溶融樹脂と常に接触する第1温度センサー、ベン
ト部でベントアップ発生時に溶融樹脂と接触するように
設けられた第2温度センサーと、ベント部の溶融樹脂と
接触しない位置に設けられた第3温度センサーの3つの
信号の比較を判定器によりベントアップの報知と検出能
力の不良を報知する方法がある。
Another vent-up detection method is
A first temperature sensor that is always in contact with the molten resin in the cylinder of the vent extruder, as shown in Japanese Patent No. 855, and a second temperature sensor that is provided in the vent section so as to be in contact with the molten resin when venting occurs. There is a method of comparing three signals from a third temperature sensor provided at a position not in contact with the molten resin in the vent part and using a determiner to notify that the vent is up and that the detection ability is defective.

この方法は、検出精度は改善されるものの設備が複雑に
なるとともに一度溶融樹脂が付着してベントアップを検
出すると溶融樹脂の付着により検出応答性が低下する欠
点がある。
Although this method improves detection accuracy, it requires complicated equipment and has the drawback that once molten resin has adhered and vent-up has been detected, the detection response is reduced due to the molten resin.

(問題点を解決するための手段) 本発明は温度コントロールされたベント部に設置された
ベントアップ検出用温度センサーの温度変化によりベン
トアップを検出するとともに、溶融樹脂が付着してベン
トアップを検出して溶融樹脂の付着による検出応答性が
低下しないベントア,ブ検出方法を提供するものである
。すなわち、本発明は、ベント押出機の脱気部内を溶融
樹脂温度より高い温度に加熱コントロールし、脱気部内
に設けたベントアップ検出用温度センサーがベントアッ
プ時は検出温度より低下することによりベントアップを
検出し、警報や運転条件変更などの処置を構ずることが
できるベント押出機のベントアップ検出方法である。
(Means for Solving the Problems) The present invention detects vent-up based on temperature changes in a temperature sensor for detecting vent-up installed in a temperature-controlled vent part, and also detects vent-up due to adhesion of molten resin. The object of the present invention is to provide a vent detection method that does not reduce detection response due to adhesion of molten resin. In other words, the present invention controls heating the inside of the degassing section of the vent extruder to a temperature higher than the temperature of the molten resin, and the vent-up detection temperature sensor installed in the degassing section lowers the temperature below the detection temperature when the vent is up. This is a vent-up detection method for a vent extruder that can detect the vent-up and take measures such as issuing an alarm or changing operating conditions.

(作 用) 押出機内の溶融樹脂温度よりも高い温度にコントロール
されたベント部内のベントアップ検出用温度センサーは
ベントアップによる溶融樹脂と接触すると検出温度が低
下してベントアップを検出する。さらにベントアップ検
出用温度センサーに付着した溶融樹脂はベント部雰囲気
温度が高いために固化せずベントアップ検出用温度セン
サーの検出応答性が低下しない。また従来方法のように
ベントアップ検出時に検出センサーに付着した固化樹脂
の除去も不要となる。
(Function) When the vent-up detection temperature sensor in the vent part, which is controlled at a temperature higher than the temperature of the molten resin in the extruder, comes into contact with the molten resin due to vent-up, the detection temperature decreases and detects vent-up. Furthermore, the molten resin adhering to the temperature sensor for vent-up detection does not solidify because the ambient temperature of the vent portion is high, so that the detection response of the temperature sensor for vent-up detection does not deteriorate. Furthermore, unlike the conventional method, it is not necessary to remove the solidified resin adhering to the detection sensor during vent-up detection.

(発明の効果) ベントアップを検出してベントアップ検出温度センサー
に溶融樹脂が付着しても固化しないため検出応答性が低
下することがなく、付着樹脂の除去も不要となる。
(Effects of the Invention) Even if molten resin adheres to the vent-up detection temperature sensor when vent-up is detected, it does not solidify, so detection responsiveness does not decrease, and there is no need to remove the adhered resin.

(実施例) 以下本発明の実施例を説明する。(Example) Examples of the present invention will be described below.

第1図は本発明によるベントアップ検出装置を備えたベ
ント押出機のベント部の一例を示す。温度調節用のヒー
ター1により加熱されたシリンダー2内にスクリュー3
が設けられている。シリンダ2にはベント部8が設けら
れておりベント部8には脱気口7が設けられ真空ポンプ
(図示せず)により吸引されベント部8が負圧伏態とな
り溶融樹脂に含まれる揮発分や水分が除去される。ベン
ト部8は加熱用ジャケット4が設けられており、ペント
部内の温度を溶融樹脂温度よりも高い温度に温度センサ
ー5によりコント口一ノレする。ベントアップ検出用温
度センサー6の先端検出部は、ベントアップが発生して
いない正常運転時は温度センサー5によりジャケット4
で加熱コントロールされたベット部内の温度を検出する
がベントアップが発生して溶融樹脂が盛上った時には先
端検出部が溶融樹脂と接触する位置に設けられている。
FIG. 1 shows an example of a vent section of a vent extruder equipped with a vent-up detection device according to the present invention. A screw 3 is placed inside a cylinder 2 heated by a heater 1 for temperature adjustment.
is provided. The cylinder 2 is provided with a vent part 8, and the vent part 8 is provided with a deaeration port 7, which is sucked by a vacuum pump (not shown), and the vent part 8 is brought into a negative pressure state to remove volatiles contained in the molten resin. and water are removed. The vent section 8 is provided with a heating jacket 4, and the temperature inside the vent section is controlled by a temperature sensor 5 to a temperature higher than the temperature of the molten resin. The tip detection part of the temperature sensor 6 for detecting vent-up detects the temperature of the jacket 4 by the temperature sensor 5 during normal operation when no vent-up has occurred.
The temperature inside the heated bed section is detected, and when venting occurs and the molten resin rises, the tip detection section is provided at a position where it comes into contact with the molten resin.

シリンダ2内の溶融樹脂はスクリュー3によって図中右
から左へ移送される。ベントアップの発生していない正
常運転時はベント部に樹脂が盛り上っていないので溶融
樹脂温度度より高い温度Tにジャケット4を温度センサ
ー5でコントロールしている。ベントアップ検出用温度
センサー6もベント部8の温度下を検出している。
The molten resin in the cylinder 2 is transferred from the right to the left in the figure by the screw 3. During normal operation when no vent up occurs, resin does not bulge in the vent portion, so the jacket 4 is controlled by the temperature sensor 5 to a temperature T higher than the temperature of the molten resin. The vent-up detection temperature sensor 6 also detects a temperature drop in the vent section 8.

ベントアップが発生すると第2図に示すように上昇した
溶融樹脂9がベントアップ検出用温度センサー6の先端
検出部に接触し、ベントアップ検出用温度センサー6の
検出温度がベント部Tより低下したのを検出してベント
アップ検出信号を出し警報や運転条件変更などの指示を
出す。
When vent-up occurs, the rising molten resin 9 contacts the tip detection part of the vent-up detection temperature sensor 6 as shown in FIG. 2, and the detected temperature of the vent-up detection temperature sensor 6 drops below the vent part T The system detects this and issues a vent-up detection signal to issue an alarm or instructions to change operating conditions.

ベント部内のコントロールする温度Tは溶融樹脂の種類
や押出機の性能により溶融樹脂温度の変動巾が異なるた
め、溶融樹脂温度の変動巾の高い方の温度よりも高くす
ることにより本発明の効果が得られる。
The effect of the present invention can be enhanced by setting the controlled temperature T in the vent section higher than the temperature with a higher fluctuation range of the molten resin, since the range of fluctuation of the molten resin temperature varies depending on the type of molten resin and the performance of the extruder. can get.

さらに、ベントアップを検出してベントアップ検出用温
度センサー6の先端検出部に溶融樹脂が付着してもベン
ト部8の雰囲気温度Tは樹脂が溶融する温度以上にコン
トロールされているため運転条件の変更等で正常運転に
復帰したとき付着樹脂の固化はなく、ベントアップ検出
用温度センサー6の検出応答性が低下することもない。
Furthermore, even if molten resin adheres to the tip detection part of the vent-up detection temperature sensor 6 when vent-up is detected, the ambient temperature T of the vent part 8 is controlled to be higher than the temperature at which the resin melts, so the operating conditions When normal operation is restored due to changes or the like, the adhering resin will not solidify, and the detection response of the vent-up detection temperature sensor 6 will not deteriorate.

さらにベント部8の内壁温度が低いと溶融樹脂から発生
する揮発分等が凝集して堆積するが、本発明ではベント
部8の雰囲気を高くコントロールしているために上記揮
発分等のベント部8の内壁やベントアップ検出用温度セ
ンサー8への凝集堆積が防止される効果も有る。
Furthermore, if the inner wall temperature of the vent section 8 is low, volatile components generated from the molten resin aggregate and accumulate, but in the present invention, since the atmosphere of the vent section 8 is controlled to be high, the volatile components etc. It also has the effect of preventing agglomeration and deposition on the inner wall of the vent-up detection temperature sensor 8.

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

第1図は本発明の実施例を示す図である。第2図は本発
明の実施例でベントアップ発生時の溶融樹脂の上昇時の
例を示す図である。 1;シリンダ加熱用ジャケット 2;シリンダ 3 スクリュー 4;ベント部加熱用ジャケット 5;ベント部コントロール用温度センサー6;ベントア
ップ検出用温度センサー 7;脱気口 8;ベント部 9;ベントアップ時の盛上った溶融樹脂特許出願人  
東洋紡績株式会社 早l 図 昂2図 1  シリンヂ顎舞1弓ジーγヅト 2−:/+1ンタ゛′ 3  入りl l S − 8  ぺ〉ト噌や
FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing an example of when the molten resin rises when vent-up occurs in the embodiment of the present invention. 1; Jacket for cylinder heating 2; Cylinder 3 Screw 4; Jacket for heating the vent part 5; Temperature sensor for vent part control 6; Temperature sensor for detecting vent up 7; Deaeration port 8; Vent part 9; Patent applicant for molten resin patent
Toyobo Co., Ltd. Figure 2 Figure 1 Cylinder Jaw Dance 1 Bow Gee γ Zuto 2-:/+1 Tina' 3 Entering l l S-8 Peto Soya

Claims (1)

【特許請求の範囲】[Claims] ベント押出機の脱気部内を溶融樹脂温度より高い温度に
加熱コントロールし、脱気部内に設けたベントアップ検
出用温度センサーがベントアップ時は検出温度より低下
することによりベントアップを検出し、警報や運転条件
変更などの処置を構ずることができるベント押出機のベ
ントアップ検出方法。
The inside of the degassing section of the vent extruder is heated to a temperature higher than the temperature of the molten resin, and the vent-up detection temperature sensor installed inside the degassing section detects vent-up when the temperature drops below the detection temperature and issues an alarm. A vent-up detection method for a vent extruder that allows you to take measures such as changing operating conditions.
JP1052504A 1989-03-03 1989-03-03 Detection of vent of vent extruder Pending JPH02231122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1052504A JPH02231122A (en) 1989-03-03 1989-03-03 Detection of vent of vent extruder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1052504A JPH02231122A (en) 1989-03-03 1989-03-03 Detection of vent of vent extruder

Publications (1)

Publication Number Publication Date
JPH02231122A true JPH02231122A (en) 1990-09-13

Family

ID=12916558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1052504A Pending JPH02231122A (en) 1989-03-03 1989-03-03 Detection of vent of vent extruder

Country Status (1)

Country Link
JP (1) JPH02231122A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05237907A (en) * 1992-02-26 1993-09-17 Mitsuba Seisakusho:Kk Resin backflow prevention method for foaming resin extruder
JP2001200048A (en) * 2000-01-20 2001-07-24 Mitsubishi Chemicals Corp Method for manufacturing aromatic polycarbonate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05237907A (en) * 1992-02-26 1993-09-17 Mitsuba Seisakusho:Kk Resin backflow prevention method for foaming resin extruder
JP2001200048A (en) * 2000-01-20 2001-07-24 Mitsubishi Chemicals Corp Method for manufacturing aromatic polycarbonate

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