JPH08164519A - Granulation of polymer - Google Patents
Granulation of polymerInfo
- Publication number
- JPH08164519A JPH08164519A JP33310194A JP33310194A JPH08164519A JP H08164519 A JPH08164519 A JP H08164519A JP 33310194 A JP33310194 A JP 33310194A JP 33310194 A JP33310194 A JP 33310194A JP H08164519 A JPH08164519 A JP H08164519A
- Authority
- JP
- Japan
- Prior art keywords
- polymer
- cutter
- melt viscosity
- value
- nozzle
- 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
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融ポリマーをノズル
から押し出し、冷却固化後、カッターで切断するポリマ
ー造粒方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer granulation method in which a molten polymer is extruded from a nozzle, cooled and solidified, and then cut by a cutter.
【０００２】[0002]
【従来の技術】溶融ポリマーを粒状化する場合、溶融ポ
リマーをノズルからストランド状に押し出し、冷却固化
後、カッターで切断するポリマー造粒装置が広く使用さ
れている。このような造粒装置において、ノズルからの
押し出し量が変化した場合、粒状物 (ペレット) の形状
が変化するという問題があった。そして、ペレットの形
状を一定に保つには、作業員がペレットの形状を測定
し、押し出し量の変化に応じてカッター速度を調節する
必要があった。このため、押し出し量の変化に対する応
答性が悪く、均一な形状のペレットを得ることは困難で
あった。2. Description of the Related Art When granulating a molten polymer, a polymer granulating apparatus is widely used in which the molten polymer is extruded from a nozzle in a strand shape, cooled and solidified, and then cut by a cutter. In such a granulating apparatus, there is a problem that the shape of the granular material (pellet) changes when the amount of extrusion from the nozzle changes. Then, in order to keep the shape of the pellet constant, it was necessary for an operator to measure the shape of the pellet and adjust the cutter speed according to the change in the extrusion amount. For this reason, the responsiveness to changes in the amount of extrusion is poor, and it is difficult to obtain pellets of uniform shape.
【０００３】この問題を解決するものとして、ペレット
の形状を自動的に測定する装置を設け、その測定値によ
りカッター速度を調節するようにした装置が提案されて
いる(特開平４− 25408号) 。しかし、この装置では、
ペレットの形状が変化してからの応答であるため、形状
不良のペレットが製品中に混入することは避けられなか
った。As a solution to this problem, a device has been proposed in which a device for automatically measuring the shape of pellets is provided and the cutter speed is adjusted based on the measured value (Japanese Patent Laid-Open No. 25408/1992). . However, with this device,
Since the response was after the pellet shape changed, it was unavoidable that defective pellets were mixed in the product.
【０００４】本発明者らは、先に、溶融ポリマーをノズ
ルへ送る配管に圧力検出端を設け、その検出圧力値によ
りカッター速度を制御するようにしたポリマー造粒装置
を提案した（実開平５− 95710号) 。この装置によれ
ば、ポリマー流量の変化にカッター速度を速やかに対応
させることができるため、均一な形状のペレットを得る
ことができた。しかし、ポリマーの溶融粘度が変化した
場合、ポリマー配管中の圧力も変化してポリマー流量が
変化したかのように誤指示されてしまうという問題があ
った。The present inventors have previously proposed a polymer granulating apparatus in which a pressure detecting end is provided in a pipe for sending a molten polymer to a nozzle, and a cutter speed is controlled by the detected pressure value (actually developed flat plate 5). − 95710). According to this apparatus, the cutter speed can be quickly made to correspond to the change in the polymer flow rate, so that pellets having a uniform shape can be obtained. However, when the melt viscosity of the polymer changes, the pressure in the polymer pipe also changes, and there is a problem that the polymer flow rate is erroneously instructed.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、ノズルから
の押し出し量の変化に即応し、かつポリマーの溶融粘度
変化の影響を排除してカッター速度を調節することがで
き、均一な形状のペレットを得ることのできるポリマー
造粒方法を提供しようとするものである。DISCLOSURE OF THE INVENTION The present invention provides a pellet having a uniform shape, which can respond to a change in the amount of extrusion from a nozzle and eliminate the influence of a change in the melt viscosity of a polymer to adjust the cutter speed. It is intended to provide a polymer granulation method capable of obtaining the above.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記の課題を
解決するもので、その要旨は、溶融ポリマーをノズルか
ら押し出し、冷却固化後、カッターで切断するポリマー
造粒方法において、溶融ポリマーをノズルへ送る配管に
ポリマーの溶融粘度検出端及び圧力検出端を設け、これ
らの検出値によりカッター速度を制御することを特徴と
するポリマー造粒方法にある。Means for Solving the Problems The present invention is to solve the above problems, and its gist is to extrude a molten polymer from a nozzle, cool and solidify it, and then cut with a cutter to obtain a molten polymer. A polymer granulation method is characterized in that a pipe for sending to a nozzle is provided with a melt viscosity detection end and a pressure detection end of the polymer, and the cutter speed is controlled by these detection values.
【０００７】次に、本発明の方法について、図面により
具体的に説明する。図１は、本発明の方法で用いられる
装置の一例を示す概略説明図であり、１は溶融ポリマー
をノズル２へ送る配管、３は溶融粘度検出端、４は圧力
検出端、５はカッター速度調節計、６はカッター、７は
ペレットである。Next, the method of the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic explanatory view showing an example of an apparatus used in the method of the present invention, 1 is a pipe for sending a molten polymer to a nozzle 2, 3 is a melt viscosity detecting end, 4 is a pressure detecting end, 5 is a cutter speed. A controller, 6 is a cutter, and 7 is a pellet.
【０００８】溶融ポリマーは配管１を通ってノズル２か
ら押し出されるが、その流量が定常値よりも多くなった
場合、ノズル２での圧力損失が大きくなり、圧力検出端
４での圧力値が定常値より上昇する。この検出圧力値の
信号をカッター速度調節計５に送る。また、溶融粘度検
出端３で配管中を流れるポリマーの溶融粘度を検出し、
溶融粘度値の信号をカッター速度調節計５に送る。溶融
粘度値が一定であれば、カッター速度調節計５は圧力値
の信号のみを使って演算を行い、ペレット７のサイズが
一定となるような値までカッター６の回転数制御の設定
値を上げる。溶融粘度値が低下していれば、カッター速
度調節計５は圧力値の信号に溶融粘度が低下したことに
よる圧力損失の低下分を加算して演算し、カッター６の
回転数制御の設定値を適正な値まで上げる。溶融粘度値
が高くなっていれば、カッター速度調節計５は圧力値の
信号に溶融粘度が高くなったことによる圧力損失の上昇
分を減算して演算し、カッター６の回転数制御の設定値
を適正な値まで上げる。The molten polymer is extruded from the nozzle 2 through the pipe 1, but when the flow rate becomes larger than the steady value, the pressure loss at the nozzle 2 becomes large and the pressure value at the pressure detecting end 4 becomes steady. Higher than the value. The signal of the detected pressure value is sent to the cutter speed controller 5. Further, the melt viscosity of the polymer flowing in the pipe is detected by the melt viscosity detecting end 3,
A signal of the melt viscosity value is sent to the cutter speed controller 5. If the melt viscosity value is constant, the cutter speed controller 5 calculates using only the pressure value signal, and raises the setting value of the rotational speed control of the cutter 6 to a value at which the size of the pellet 7 becomes constant. . If the melt viscosity value has decreased, the cutter speed controller 5 calculates by adding the decrease in pressure loss due to the decrease in melt viscosity to the signal of the pressure value to calculate the setting value for the rotational speed control of the cutter 6. Increase to a proper value. If the melt viscosity value is high, the cutter speed controller 5 subtracts the increase in the pressure loss due to the increase in the melt viscosity from the pressure value signal to calculate the value, and sets the rotational speed control value of the cutter 6. To a proper value.
【０００９】配管１を流れるポリマーの流量が定常値よ
りも少なくなった場合、ノズル２での圧力損失が小さく
なり、圧力検出端４での圧力値が定常値より低下する。
この検出圧力値の信号をカッター速度調節計５に送る。
また、溶融粘度検出端３で配管中を流れるポリマーの溶
融粘度を検出し、溶融粘度値の信号をカッター速度調節
計５に送る。そして、カッター速度調節計５で上記と同
様に溶融粘度値の信号による補正をした演算を行い、ペ
レット７のサイズが一定となるような値までカッター６
の回転数制御の設定値を下げる。When the flow rate of the polymer flowing through the pipe 1 becomes smaller than the steady value, the pressure loss at the nozzle 2 becomes small and the pressure value at the pressure detecting end 4 becomes lower than the steady value.
The signal of the detected pressure value is sent to the cutter speed controller 5.
Further, the melt viscosity detecting end 3 detects the melt viscosity of the polymer flowing in the pipe, and sends a signal of the melt viscosity value to the cutter speed controller 5. Then, the cutter speed controller 5 performs a calculation in which the melt viscosity value is corrected in the same manner as described above, and the cutter 6 reaches a value at which the size of the pellet 7 becomes constant.
Decrease the setting value of the rotation speed control of.
【００１０】配管１を流れるポリマーの流量が一定であ
って、溶融粘度が上昇又は低下した場合、圧力検出端４
での圧力値は上昇又は低下するが、カッター速度調節計
５で溶融粘度値の信号による補正をした演算が行われ、
カッター６の回転数制御の設定値は一定のまま運転が続
行される。When the flow rate of the polymer flowing through the pipe 1 is constant and the melt viscosity increases or decreases, the pressure detecting end 4
However, the cutter speed controller 5 performs the calculation with the correction of the melt viscosity value signal,
The operation is continued with the set value of the rotational speed control of the cutter 6 kept constant.
【００１１】なお、カッター速度調節計５としては、ア
ナログ式、デジタル式のいずれを採用してもよく、コン
ピュータを使用することもできる。The cutter speed controller 5 may be either an analog type or a digital type, and a computer may be used.
【００１２】[0012]
【発明の効果】本発明によれば、溶融ポリマーの流量や
溶融粘度が変化しても、これに即応してカッターの回転
数を制御することができ、形状の一定したペレットを得
ることが可能となる。According to the present invention, even if the flow rate or melt viscosity of the molten polymer changes, the rotational speed of the cutter can be controlled in response to the change and pellets having a uniform shape can be obtained. Becomes
【図１】本発明の方法の実施に用いられる装置の一例を
示す概略説明図である。FIG. 1 is a schematic explanatory view showing an example of an apparatus used for carrying out the method of the present invention.
【符号の説明】 １ 溶融ポリマーをノズルへ送る配管 ２ ノズル ３ 溶融粘度検出端 ４ 圧力検出端 ５ カッター速度調節計 ６ カッター[Explanation of Codes] 1 Piping for sending molten polymer to nozzle 2 Nozzle 3 Melt viscosity detecting end 4 Pressure detecting end 5 Cutter speed controller 6 Cutter
Claims (1)
却固化後、カッターで切断するポリマー造粒方法におい
て、溶融ポリマーをノズルへ送る配管にポリマーの溶融
粘度検出端及び圧力検出端を設け、これらの検出値によ
りカッター速度を制御することを特徴とするポリマー造
粒方法。1. A polymer granulation method in which a molten polymer is extruded from a nozzle, cooled and solidified, and then cut by a cutter, and a pipe for sending the molten polymer to the nozzle is provided with a melt viscosity detection end and a pressure detection end of the polymer, A method for polymer granulation, which comprises controlling a cutter speed according to a value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33310194A JPH08164519A (en) | 1994-12-13 | 1994-12-13 | Granulation of polymer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33310194A JPH08164519A (en) | 1994-12-13 | 1994-12-13 | Granulation of polymer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08164519A true JPH08164519A (en) | 1996-06-25 |
Family
ID=18262297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33310194A Pending JPH08164519A (en) | 1994-12-13 | 1994-12-13 | Granulation of polymer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08164519A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2127839A2 (en) | 2008-05-30 | 2009-12-02 | Mitsubishi Gas Chemical Company, Inc. | Process and apparatus for producing thermoplastic resin pellets |
-
1994
- 1994-12-13 JP JP33310194A patent/JPH08164519A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2127839A2 (en) | 2008-05-30 | 2009-12-02 | Mitsubishi Gas Chemical Company, Inc. | Process and apparatus for producing thermoplastic resin pellets |
| CN101590670A (en) * | 2008-05-30 | 2009-12-02 | 三菱瓦斯化学株式会社 | The manufacture method of thermoplastic resin particle and manufacturing installation |
| TWI457366B (en) * | 2008-05-30 | 2014-10-21 | Mitsubishi Gas Chemical Co | Process and apparatus for producing thermoplastic resin pellets |
| US8985987B2 (en) | 2008-05-30 | 2015-03-24 | Mitsubishi Gas Chemical Company, Inc. | Apparatus for producing thermoplastic resin pellets |
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