JPH0655600A - Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle - Google Patents

Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle

Info

Publication number
JPH0655600A
JPH0655600A JP4231603A JP23160392A JPH0655600A JP H0655600 A JPH0655600 A JP H0655600A JP 4231603 A JP4231603 A JP 4231603A JP 23160392 A JP23160392 A JP 23160392A JP H0655600 A JPH0655600 A JP H0655600A
Authority
JP
Japan
Prior art keywords
screw
cylinder
resin
temperature
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
Application number
JP4231603A
Other languages
Japanese (ja)
Inventor
Nobuhiko Nishiwaki
脇 信 彦 西
Airei Sai
愛 玲 崔
Tadashi Hanada
田 忠 花
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.)
MECHATRO TOKIWA INTERNATL KK
Original Assignee
MECHATRO TOKIWA INTERNATL KK
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 MECHATRO TOKIWA INTERNATL KK filed Critical MECHATRO TOKIWA INTERNATL KK
Priority to JP4231603A priority Critical patent/JPH0655600A/en
Publication of JPH0655600A publication Critical patent/JPH0655600A/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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
    • B29C48/9185—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling in the direction of the stream of the material
    • 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
    • B29C2948/92209—Temperature
    • 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
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/924—Barrel or housing
    • 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
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/92895—Barrel or housing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To prevent defective molding by a method wherein a thermocouple is inserted near the internal surface of a heating cylinder for an injection molding machine with a screw, the temperature and temperature change of the position of the thermocouple is measured, the plasticized state of the resin in the cylinder is detected and the number of revolutions of the screw and back pressure are changed in response to the plasticized state. CONSTITUTION:A large number of holes are bored near an internal surface from the external surface of heating cylinder 1 respectively at positions corresponding to a feed zone 2a, a compression zone 2b and a metering zone 2c in a screw 2 for the heating cylinder 1, and thermocouples 3 are inserted into the holes respectively. Temperatures near the internal surfaces of each zone 2a, 2b, 2c in the screw 2 are measured at a plurality of spots. Accordingly, a calorific value by the friction, etc., of a raw resin under the state of a solid layer, a shearing calorific value in a melting section in the cylinder 1 and the state of a temperature change at the time of a change to a liquid layer in the melting section can be detected easily, and the number of revolutions, back pressure, etc., can be set and varied so as to be brought to a plasticized state coinciding with the original function of the screw 2 in the cylinder 1.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は射出成形機や押出成型機
における原料樹脂の溶融温度を熱電対を設けて測定し、
その測定結果を基礎にして前記原料樹脂の可塑化状態を
検出する方法と前記測定に加え、又は、別個にノズルか
ら射出される溶融樹脂の温度を熱電対により検出するこ
とにより、成形条件に合致したスクリュ−の回転数など
を制御する樹脂の可塑化制御方法に関するものである。BACKGROUND OF THE INVENTION The present invention measures the melting temperature of a raw material resin in an injection molding machine or an extrusion molding machine by providing a thermocouple,
In addition to the method of detecting the plasticized state of the raw material resin based on the measurement result and the measurement, or by separately detecting the temperature of the molten resin injected from the nozzle with a thermocouple, the molding conditions are met. The present invention relates to a plasticization control method for a resin, which controls the rotation speed of the screw.

【０００２】[0002]

【従来の技術】従来からよく知られているように、射出
成形機や押出成形機では、その加熱筒シリンダ−の外表
面にはヒ−タ−が巻かれており、加熱筒シリンダ−の温
度を測定して制御するために、その加熱筒シリンダ−に
はその肉厚内の略中央部分に熱電対が挿入設置されてい
る。即ち、その熱電対で測定される温度が所定温度とな
るようにヒ−タ−の加熱状態が制御されているのであ
る。As is well known in the prior art, in an injection molding machine or an extrusion molding machine, a heater is wound around the outer surface of the heating cylinder cylinder, and the temperature of the heating cylinder cylinder is In order to measure and control the temperature, a thermocouple is inserted and installed in the heating cylinder cylinder at a substantially central portion within its thickness. That is, the heating state of the heater is controlled so that the temperature measured by the thermocouple becomes a predetermined temperature.

【０００３】この場合において、ヒ−タ−は主に加熱筒
シリンダ−内で可塑化された原料樹脂の温度が下がるの
を防止するための手段として用いられていて、実際に原
料樹脂の可塑化に要するエネルギ−の大部分は、スクリ
ュ−の回転により生じる原料樹脂とスクリュ−、或は、
原料樹脂シリンダ−内面との摩擦によって生じる熱エネ
ルギ−によりまかなわれている。また、熱電対による温
度の測定位置は、加熱筒シリンダ−の肉厚における略中
央付近であるため、前記スクリュ−の回転によって発生
し、加熱筒シリンダ−の内面において原料樹脂に直接流
入する熱量によるその樹脂の温度変化はほとんど検出さ
れていないのが現状である。In this case, the heater is mainly used as a means for preventing the temperature of the raw material resin plasticized in the heating cylinder cylinder from decreasing, and actually the plasticizing of the raw material resin is carried out. Most of the energy required for the material resin and screw generated by the rotation of the screw, or
It is covered by the heat energy generated by the friction with the inner surface of the raw material resin cylinder. Further, since the temperature measurement position by the thermocouple is near the center in the wall thickness of the heating cylinder cylinder, it depends on the amount of heat generated by the rotation of the screw and directly flowing into the raw material resin on the inner surface of the heating cylinder cylinder. At present, almost no change in temperature of the resin is detected.

【０００４】一般に、スクリュ−を具えた射出成形機や
押出成形機ではスクリュ−の回転によりもたらされる摩
擦熱やせん断熱によって原料樹脂を加熱し該樹脂を固層
から液層へと可塑化させている。そして、この可塑化を
効率的に行なわせるため、一般にスクリュ−の形状を、
その軸方向においてフィ−ドゾ−ン（送りゾ−ン）、コ
ンプレッションゾ−ン（圧縮ゾ−ン）、メ−タリングゾ
−ン（計量ゾ−ン）に分けてそれぞれ異なるスクリュ−
形状としている。しかし、実際にはスクリュ−の各ゾ−
ンにおいて原料樹脂が設計時に予測、或は、予定した可
塑状態となっていないことがある。Generally, in an injection molding machine or an extrusion molding machine equipped with a screw, a raw material resin is heated by frictional heat or shear heat produced by rotation of the screw to plasticize the resin from a solid layer to a liquid layer. There is. And in order to efficiently perform this plasticization, the shape of the screw is generally
In the axial direction, the screw is divided into a feed zone (feed zone), a compression zone (compression zone), and a metering zone (measuring zone).
It has a shape. However, in reality, each zone of the screw
In some cases, the raw material resin may not be in the plastic state predicted or planned at the time of design.

【０００５】一方、前記成形機のノズルから金型へ溶融
樹脂が充填されるときもこの樹脂温度を正確に測定する
必要があるが、従来のスクリュ−を有する成形機ではノ
ズル先端付近にヒ−タが無く、しかもこのノズルが加熱
筒シリンダ−のヒ−タから少し離れて位置しているた
め、送られて来る溶融樹脂に温度低下が生じることが考
えられる。しかし乍ら、現状では加熱筒シリンダ−の測
定温度とノズルから射出される樹脂の温度は等しいもの
とみなして射出成形しているのが現状であり、従って、
例えば、粘度が高い樹脂を成形する場合にはノズル内で
発熱することがあることは全く考慮されていない。On the other hand, when the molten resin is filled from the nozzle of the molding machine into the mold, it is necessary to measure the temperature of the resin accurately, but in the molding machine having the conventional screw, the heat near the nozzle tip is Since the nozzle is located at a distance from the heater of the heating cylinder cylinder, it is conceivable that the temperature of the molten resin being sent will drop. However, under the present circumstances, it is the current situation that the temperature measured by the heating cylinder cylinder and the temperature of the resin injected from the nozzle are considered to be equal, and injection molding is performed.
For example, when molding a resin having a high viscosity, the fact that heat may be generated in the nozzle is not considered at all.

【０００６】このように、従来の射出成形や押出成形で
は、加熱筒シリンダ−内で可塑化されている樹脂自体の
温度、或は、ノズルから金型内に射出される溶融樹脂自
体の温度が厳密には検出されておらず、これによって種
々の問題、例えば、ヒケやソリ等の成形不良の問題が解
決できていないのが現状である。As described above, in conventional injection molding or extrusion molding, the temperature of the resin itself plasticized in the heating cylinder cylinder or the temperature of the molten resin itself injected from the nozzle into the mold is It has not been detected rigorously, and various problems such as molding defects such as sink marks and warps cannot be solved.

【０００７】[0007]

【発明が解決しようとする課題】本発明は上記のような
従来の射出成形や押出成形における樹脂温度の検出や温
度状況の判断の現状に鑑み、スクリュ−を有する成形機
の加熱筒シリンダ−内面近くの温度や温度変化、或は、
加熱筒シリンダ−の軸方向における温度分布を測定する
ことによって、成形機のシリンダ−内における樹脂自体
の可塑化状態や成形される樹脂自体の温度状態を測定
し、これに加えて金型へ充填される際のノズル内での樹
脂の温度をより正確に測定し、これらの測定値を利用し
た樹脂の可塑化制御方法を提供することを課題とするも
のである。SUMMARY OF THE INVENTION The present invention has been made in view of the present circumstances of detection of resin temperature and judgment of temperature condition in the conventional injection molding and extrusion molding as described above, and the inner surface of the heating cylinder of the molding machine having the screw. Nearby temperature or temperature change, or
By measuring the temperature distribution in the axial direction of the heating cylinder, the plasticization state of the resin itself in the cylinder of the molding machine and the temperature state of the molded resin itself are measured, and in addition to this, the mold is filled. An object of the present invention is to provide a method for controlling plasticization of a resin by more accurately measuring the temperature of the resin in the nozzle at the time of performing the measurement and utilizing these measured values.

【０００８】[0008]

【課題を解決するための手段】上記課題を解決すること
を目的としてなされた、請求項１の発明の構成は、スク
リュ−を有する成形機における加熱筒シリンダ−の内面
近傍まで該シリンダ−外表面側から穴をあけてこの穴内
に熱電対を取り付け、その熱電対によって測定される温
度変化と、あらかじめ数値計算により求められる加熱筒
シリンダ−の内面における樹脂に或るユニットの熱量が
流入したときの温度変化曲線（シリンダ−へ流入する熱
量による温度上昇の曲線であって、温度上昇の時間微分
が流入熱量に相当し、温度の絶対値がシリンダ−内面の
温度に相当する）とを比較することにより、シリンダ−
内での可塑化時の発熱と樹脂の温度を測定し、かつ前記
シリンダ−の軸方向における温度分布の変化の状況から
スクリュ−の各ゾ−ンでの可塑化状況を検出し、この可
塑化状況が適正でないときそれに対応して可塑化条件を
変化させることにより適正な可塑化状態（スクリュ−に
おける本来の各ゾ−ンの機能に合わせた可塑化状態）を
得ることを特徴とするものである。The structure of the invention of claim 1 made for the purpose of solving the above-mentioned problems, has a heating cylinder in a molding machine having a screw, the outer surface of the cylinder up to the vicinity of the inner surface of the cylinder. A hole is drilled from the side and a thermocouple is installed in this hole, the temperature change measured by the thermocouple and the amount of heat of a certain unit flowing into the resin on the inner surface of the heating cylinder cylinder, which is obtained by numerical calculation in advance, Comparing with a temperature change curve (a curve of temperature rise due to the amount of heat flowing into the cylinder, the time derivative of the temperature rise corresponds to the amount of heat input, and the absolute value of the temperature corresponds to the temperature of the inner surface of the cylinder). Cylinder-
The heat generated during plasticization and the temperature of the resin are measured, and the plasticization status in each zone of the screw is detected from the status of the change in the temperature distribution in the axial direction of the cylinder, and this plasticization is performed. When the situation is not proper, the plasticization condition is changed correspondingly to obtain the proper plasticization state (the plasticization state matching the original function of each zone in the screw). is there.

【０００９】また、上記課題を解決することを目的とし
てなされた請求項３の発明の構成は、ノズルでの樹脂の
温度変化を、加熱筒シリンダ−の場合と同様の手法によ
り測定することによって、樹脂がノズル内を通過する際
の温度及びせん断による発熱がもたらす温度上昇量を測
定し、実際に金型へ充填されるときの樹脂温度をより正
確に検出して、成形機での成形条件を改善することを特
徴とするものである。Further, according to a third aspect of the present invention made to solve the above problems, the temperature change of the resin in the nozzle is measured by the same method as in the case of the heating cylinder cylinder. By measuring the temperature rise when the resin passes through the nozzle and the heat rise due to shearing, the temperature of the resin when it is actually filled in the mold is detected more accurately, and the molding conditions in the molding machine are set. It is characterized by improving.

【００１０】上記の本発明による各温度測定手法を用い
れば、射出成形機や押出成形機における加熱筒シリンダ
−内の可塑化状態やノズルから射出されるときの樹脂温
度を測定することができるので、これらの成形機におけ
る原料樹脂の可塑化状態を正確に把握できる。また、こ
れによって、原料樹脂が本来の可塑化状態になるように
前記成形機の可塑化条件を変化させることができ、その
結果、ノズルから金型へ充填される溶融樹脂の温度を正
確に把握してより良好な成形状態を常に保つことが可能
になる。By using each temperature measuring method according to the present invention, it is possible to measure the plasticized state in the heating cylinder in the injection molding machine or the extrusion molding machine and the resin temperature at the time of injection from the nozzle. The plasticized state of the raw material resin in these molding machines can be accurately grasped. Further, this allows the plasticizing conditions of the molding machine to be changed so that the raw material resin is in the original plasticized state, and as a result, the temperature of the molten resin filled from the nozzle into the mold can be accurately grasped. Therefore, it becomes possible to always maintain a better molding state.

【００１１】[0011]

【実施例】次に、添付図面を参照にして本発明の実施例
を説明する。図１に示すように本発明の実施例では、射
出成形機又は押出成型機の加熱筒シリンダ−１におい
て、スクリュ−２のフィ−ドゾ−ン2a，コンプレッショ
ンゾ−ン2b，メ−タリングゾ−ン2cに対応する部位にそ
れぞれシリンダ−１の外面から内面近傍に向け多数の穴
を、一例として等ピッチであけ、これらの各穴にそれぞ
れ熱電対３を挿入設置して加熱筒シリンダ−１における
スクリュ−２の各ゾ−ン2a，2b，2cの内面近傍の温度を
複数地点で測定できるようにする。図１において、４は
前記シリンダ−１の軸方向に複数を巻き付けたバンドヒ
−タ、５は前記シリンダ１の先端のノズル、６は原料樹
脂Ｐのホッパである。Embodiments of the present invention will now be described with reference to the accompanying drawings. As shown in FIG. 1, in the embodiment of the present invention, in a heating cylinder 1 of an injection molding machine or an extrusion molding machine, a feed zone 2a, a compression zone 2b, a metering zone 2a of a screw-2 are used. A large number of holes from the outer surface to the vicinity of the inner surface of the cylinder-1 are formed at the portions corresponding to 2c at equal pitches as an example, and thermocouples 3 are inserted and installed in these holes, respectively, and the screw in the heating cylinder cylinder-1 is installed. -The temperature near the inner surface of each zone 2a, 2b, 2c of -2 shall be measured at multiple points. In FIG. 1, 4 is a band heater in which plural cylinders are wound in the axial direction, 5 is a nozzle at the tip of the cylinder 1, and 6 is a hopper for the raw material resin P.

【００１２】ここで、スクリュ−２が回転するとホッパ
６の樹脂Ｐが前記スクリュ−２のフィ−ドゾ−ン2aから
コンプレッションゾ−ン2b、メ−タリングソ−ン2cを経
てノズル５側に搬送され、この間に樹脂Ｐが可塑化され
て溶融状態でノズル５から金型（図示せず）に射出され
る。When the screw-2 rotates, the resin P of the hopper 6 is conveyed from the feed zone 2a of the screw-2 to the nozzle 5 side through the compression zone 2b and the metering zone 2c. During this time, the resin P is plasticized and is injected in a molten state from the nozzle 5 into a mold (not shown).

【００１３】樹脂Ｐの可塑化は、スクリュ−２が回転す
ることによる加熱筒シリンダ−１の内面等と樹脂Ｐとの
摩擦による発熱によりなされる。加熱され可塑化状態に
なった樹脂Ｐは、図２に示すように、図１のコンプレッ
ションゾ−ン2bにおいて任意の熱電対３に対し、その部
分における温度の経時的な上昇をもたらす。この温度上
昇の状態は、可塑化条件（スクリュ−の回転数や背圧
等）が適正であれば、図３，図５に示す予め計算した単
位ユニットの熱量がシリンダ−１内の樹脂Ｐに経時的に
流入したときの温度上昇状態と比例する。つまり、コン
プレッションゾ−ン2bにおいて熱電対３によってシリン
ダ−１の内面近くの温度を測定することには、当該シリ
ンダ−１内で可塑化されつつある樹脂Ｐの温度上昇の状
態が当該樹脂Ｐにシリンダ−１内で実際に流入する熱量
によってもたらされている状態を把握できることを意味
する。The plasticization of the resin P is performed by the heat generated by the friction between the resin P and the inner surface of the heating cylinder 1 due to the rotation of the screw-2. As shown in FIG. 2, the resin P that has been heated to be in a plasticized state causes an arbitrary thermocouple 3 in the compression zone 2b of FIG. In this state of temperature increase, if the plasticizing conditions (screw rotation speed, back pressure, etc.) are appropriate, the pre-calculated heat quantity of the unit unit shown in FIGS. It is proportional to the temperature rise state when flowing in over time. That is, in order to measure the temperature near the inner surface of the cylinder-1 by the thermocouple 3 in the compression zone 2b, the temperature increase state of the resin P which is being plasticized in the cylinder-1 corresponds to the resin P. This means that the state brought about by the amount of heat actually flowing into the cylinder-1 can be grasped.

【００１４】即ち、例えば、コンプレッションゾ−ン2b
のある熱電対３の位置において、図４に一例として示し
たように、スクリュ−の回転数や背圧等に基づいて予め
計算されたシリンダ−１内の樹脂Ｐに経時的に流入する
熱量を、時間について微分すると、図４に示した総熱量
は図５の(a)〜(f)に示すように単位時間当りに流入する
熱量の総計である。一方、図５の(a)〜(f)に示した単位
時間当りの流入熱量がもたらす樹脂Ｐの温度上昇の実際
の状態は、前記熱電対３によってそれぞれ図３の(a)〜
(f)に示す温度上昇状態を示すことが測定される。そし
て、図４の(a)〜(f)に示した個々の温度上昇の総計が前
記熱電対３により経時的に検出した図２の温度上昇状態
となるのである。本発明では、スクリュ−２の各ゾ−ン
2a〜2c並びにノズル５において、上記と同様の手法によ
る温度測定を行う。That is, for example, the compression zone 2b
At a certain position of the thermocouple 3, as shown as an example in FIG. 4, the amount of heat flowing into the resin P in the cylinder-1 calculated in advance based on the rotation speed of the screw, the back pressure, etc. When differentiated with respect to time, the total amount of heat shown in FIG. 4 is the total amount of heat flowing in per unit time as shown in (a) to (f) of FIG. On the other hand, the actual state of the temperature rise of the resin P caused by the inflowing heat quantity per unit time shown in (a) to (f) of FIG.
It is measured that the temperature rise state shown in (f) is exhibited. Then, the total of the individual temperature rises shown in (a) to (f) of FIG. 4 becomes the temperature rise state of FIG. 2 detected by the thermocouple 3 with time. In the present invention, each zone of the screw-2 is
In 2a to 2c and the nozzle 5, temperature measurement is performed by the same method as described above.

【００１５】このことから、例えば、コンプレッション
ゾ−ン2bにおいて、シリンダ−１の内径やスクリュ−２
の回転数、或は、使用する樹脂Ｐの材質等によって、予
め計算できるシリンダ−１内においてスクリュ−２の回
転によりもたらされる摩擦熱等によって当該樹脂Ｐにシ
リンダ−１内で流入される熱量を示すデ−タと、熱電対
３により計測したこのコンプレッションゾ−ン2bのシリ
ンダ−１の内面近くにおける検出温度とを比較して、実
際に熱電対３により測定した樹脂Ｐの温度上昇が当初予
測した流入熱量がもたらす温度上昇変化を示さないとき
には、可塑化条件、例えば、スクリュ−２の回転速度、
バンドヒ−タ４の加熱状態などを上，下或は増，減変化
させることにより、実際の温度上昇状態を、当初計算し
て予測した樹脂に注入される熱量がもたらす温度分布に
近付けるように成形機側の作動内容、例えば、スクリュ
−の回転数や背圧等の制御を行うのである。From this, for example, in the compression zone 2b, the inner diameter of the cylinder-1 and the screw-2
Of the resin P used, or the amount of heat that flows into the resin P in the cylinder 1 due to frictional heat generated by the rotation of the screw-2 in the cylinder 1 that can be calculated in advance depending on the material of the resin P to be used. By comparing the data shown with the temperature detected by the thermocouple 3 near the inner surface of the cylinder-1 of this compression zone 2b, the temperature rise of the resin P actually measured by the thermocouple 3 is initially predicted. When there is no change in temperature rise caused by the amount of inflowing heat, the plasticizing conditions such as the rotation speed of the screw-2,
By changing the heating state of the band heater 4 up, down, or by increasing or decreasing, the actual temperature rising state is made to approach the temperature distribution brought about by the amount of heat injected into the resin that was initially calculated and predicted. The operation contents on the machine side, for example, the number of revolutions of the screw and the back pressure are controlled.

【００１６】上記説明はスクリュ−２のコンプレッショ
ンゾ−ン2bにおける例であるが、本発明ではフィ−ドゾ
−ン2a，メ−タリングゾ−ン2cに関しても、夫々に熱電
対３による温度実測値と予め計算により求めたシリンダ
−１の内部での流入熱量とを比較して上記と同様の操作
を行う。また、ノズル５においても、ノズル５の内面近
くに熱電対31を設置しノズル５を通過する溶融樹脂の温
渡や温度変化と、この部位における予め計算された注入
熱量とを比較して上記のシリンダ−内における場合と同
様の制御を行う。Although the above description is an example of the compression zone 2b of the screw-2, the present invention also relates to the feeding zone 2a and the metering zone 2c and the measured temperature values by the thermocouple 3, respectively. The inflow heat quantity inside the cylinder-1 obtained by calculation in advance is compared and the same operation as above is performed. Also in the nozzle 5, a thermocouple 31 is installed near the inner surface of the nozzle 5 to compare the temperature and the temperature change of the molten resin passing through the nozzle 5 with the pre-calculated amount of injected heat at this portion. The same control as in the cylinder is performed.

【００１７】[0017]

【発明の効果】以上のように、本発明に係る可塑化状態
の検出方法を採用することにより、固層状態の原料樹脂
の摩擦等による発熱量とシリンダ−内の溶融部でのせん
断による発熱量及び原料樹脂が固層から溶融部で液層へ
変化するときの温度変化状態が容易に検出できるので、
原料樹脂が加熱筒シリンダ−内でスクリュ−の本来の機
能（フィ−ドゾ−ン（送りゾ−ン）、コンプレッション
ゾ−ン（圧縮ゾ−ン）、メ−タリングゾ−ン（計量ゾ−
ン））とほぼ合致した可塑化状態になるように、可塑化
条件（スクリュ−の回転数、背圧など）を任意に設定，
変更することが可能となり、しかも、金型内にノズルか
ら排出される樹脂自体の温度も正確に把握できるので、
常に良好な成形状態を実現するため温度制御を行うこと
が可能となる等の優れた効果が得られる。As described above, by adopting the method for detecting the plasticized state according to the present invention, the amount of heat generated by the friction of the raw material resin in the solid layer state and the heat generated by the shear in the melting portion in the cylinder Since the amount of temperature and the temperature change state when the raw material resin changes from the solid layer to the liquid layer at the melting portion can be easily detected,
The raw resin is the original function of the screw in the heating cylinder (feed zone (feed zone), compression zone (compression zone), metering zone (measuring zone).
The plasticization conditions (screw speed, back pressure, etc.) can be set arbitrarily so that the plasticized state almost matches
It is possible to change it, and moreover, the temperature of the resin itself discharged from the nozzle in the mold can be accurately grasped,
An excellent effect is obtained such that temperature control can be performed in order to always realize a good molding state.

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

【図１】本発明の温度測定を適用した例を示す加熱筒シ
リンダ−の断面図。FIG. 1 is a cross-sectional view of a heating cylinder cylinder showing an example to which the temperature measurement of the present invention is applied.

【図２】本発明におけるシリンダ−内の樹脂の温度上昇
状態を示す温度線図。FIG. 2 is a temperature diagram showing a temperature rising state of resin in a cylinder according to the present invention.

【図３】図２の温度線図の単位時間当りの温度上昇を示
す温度線図。FIG. 3 is a temperature diagram showing a temperature rise per unit time of the temperature diagram of FIG.

【図４】予め計算されるシリンダ−内での流入熱量を示
す温度線図。FIG. 4 is a temperature diagram showing a pre-calculated inflow heat quantity in a cylinder.

【図５】図３の流入熱量を単位時間当りの流入熱量で示
した温度線図。FIG. 5 is a temperature diagram showing the inflow heat amount in FIG. 3 as the inflow heat amount per unit time.

【符号の説明】[Explanation of symbols]

１ 加熱筒シリンダ− ２ スクリュ− ３ 熱電対 ４ バンドヒ−タ ５ ノズル 1 heating cylinder cylinder 2 screw 3 thermocouple 4 band heater 5 nozzle

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 スクリュ−を有する成形機の加熱筒シリ
ンダ−の内面近くに熱電対を挿入設置して、その部位の
温度及び温度変化を測定することにより該シリンダ−内
の樹脂の可塑化状態を検出し、検出したシリンダ−内の
樹脂の可塑化状態に対応してスクリュ−の回転数や背圧
等の可塑化要因の状態を変化させることを特徴とする可
塑化制御方法。1. A plasticizing state of the resin in the heating cylinder of a molding machine having a screw, in which a thermocouple is inserted and installed near the inner surface and the temperature and temperature change at that portion are measured. Is detected and the state of a plasticizing factor such as the number of revolutions of the screw or back pressure is changed in accordance with the detected plasticizing state of the resin in the cylinder. 【請求項２】 スクリュ−を有する成形機の加熱筒シリ
ンダ−の内面近くに熱電対を挿入設置して、前記シリン
ダ−の軸方向における温度分布の時間的変化を測定する
ことにより該シリンダ−内に於ける樹脂の可塑化状態を
検出し、検出したシリンダ−内の樹脂の可塑化状態に対
応してスクリュ−の回転数や背圧等の可塑化要因の状態
を変化させる請求項１の可塑化制御方法。2. A thermocouple is inserted and installed near the inner surface of a heating cylinder cylinder of a molding machine having a screw, and the time variation of the temperature distribution in the axial direction of the cylinder is measured to measure the inside of the cylinder. 2. The plasticization according to claim 1, wherein the plasticization state of the resin in the cylinder is detected, and the states of the plasticization factors such as the rotation speed of the screw and the back pressure are changed according to the detected plasticization state of the resin in the cylinder. Control method. 【請求項３】 スクリュ−を有する成形機のノズル部分
の内面近くに熱電対を挿入設置して、その部位の温度及
び温度変化を測定することにより該ノズル内を通過する
溶融樹脂のせん断による発熱状態と温度状態を検出し、
検出したノズル内の樹脂の発熱状態と温度状態に対応し
て加熱筒シリンダ−の加熱温度，スクリュ−の回転数，
背圧等を制御する可塑化制御方法。3. A thermocouple is inserted and installed near the inner surface of the nozzle portion of a molding machine having a screw, and the temperature and temperature change at that portion are measured to generate heat due to shearing of the molten resin passing through the nozzle. Detects the condition and temperature condition,
The heating temperature of the heating cylinder, the number of revolutions of the screw, and the heating temperature of the resin in the nozzle
A plasticization control method for controlling back pressure and the like. 【請求項４】 スクリュ−を有する成形機のノズル部分
の内面近くに熱電対を挿入設置して、前記ノズルの軸方
向における温度分布を測定することにより、該ノズル内
で流動する樹脂のせん断による発熱と金型へ充填される
樹脂の温度状態を検出し、検出したノズル内の樹脂の発
熱状態と温度状態に対応して加熱筒シリンダ−の加熱温
度，スクリュ−の回転数，背圧等を制御する請求項３の
可塑化制御方法。4. A thermocouple is inserted and installed near the inner surface of the nozzle portion of a molding machine having a screw, and the temperature distribution in the axial direction of the nozzle is measured to measure the shearing of the resin flowing in the nozzle. Detects the heat generation and the temperature condition of the resin filled in the mold, and determines the heating temperature of the heating cylinder, screw rotation speed, back pressure, etc. according to the detected heat generation condition and temperature condition of the resin in the nozzle. The plasticization control method according to claim 3, which is controlled.
JP4231603A 1992-08-07 1992-08-07 Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle Pending JPH0655600A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4231603A JPH0655600A (en) 1992-08-07 1992-08-07 Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4231603A JPH0655600A (en) 1992-08-07 1992-08-07 Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle

Publications (1)

Publication Number Publication Date
JPH0655600A true JPH0655600A (en) 1994-03-01

Family

ID=16926104

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4231603A Pending JPH0655600A (en) 1992-08-07 1992-08-07 Control method of plasticized state of resin in molding machine with screw by measuring temperature of heating cylinder and nozzle

Country Status (1)

Country Link
JP (1) JPH0655600A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8287264B2 (en) * 2005-09-28 2012-10-16 Konica Minolta Opto, Inc. Injection molding machine
WO2017099298A1 (en) * 2015-12-08 2017-06-15 (주)유도 Heating cylinder for injection-molding machine
WO2019177040A1 (en) * 2018-03-14 2019-09-19 日精樹脂工業株式会社 Temperature control device for injection molding machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8287264B2 (en) * 2005-09-28 2012-10-16 Konica Minolta Opto, Inc. Injection molding machine
WO2017099298A1 (en) * 2015-12-08 2017-06-15 (주)유도 Heating cylinder for injection-molding machine
WO2019177040A1 (en) * 2018-03-14 2019-09-19 日精樹脂工業株式会社 Temperature control device for injection molding machine
US11772314B2 (en) 2018-03-14 2023-10-03 Nissei Plastic Industrial Co., Ltd. Temperature control device for injection molding machine

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