DE1554905B2 - CONTROL ARRANGEMENT FOR EXTRUDER FOR THE PRODUCTION OF FILMS OR FEDES FROM PLASTIC - Google Patents

CONTROL ARRANGEMENT FOR EXTRUDER FOR THE PRODUCTION OF FILMS OR FEDES FROM PLASTIC

Info

Publication number
DE1554905B2
DE1554905B2 DE19651554905 DE1554905A DE1554905B2 DE 1554905 B2 DE1554905 B2 DE 1554905B2 DE 19651554905 DE19651554905 DE 19651554905 DE 1554905 A DE1554905 A DE 1554905A DE 1554905 B2 DE1554905 B2 DE 1554905B2
Authority
DE
Germany
Prior art keywords
extruder
extruder head
control arrangement
housing
temperature
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
DE19651554905
Other languages
German (de)
Other versions
DE1554905A1 (en
Inventor
Kurt Dipl.-Ing. 7500 Karlsruhe Fuchs
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of DE1554905A1 publication Critical patent/DE1554905A1/en
Publication of DE1554905B2 publication Critical patent/DE1554905B2/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
    • B29C48/92—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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/9259—Angular velocity
    • 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
    • B29C2948/92885—Screw or gear
    • 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
    • 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
    • B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films

Description

Die Erfindung betrifft eine Regelanordnung für Extruder zur Herstellung von Folien oder Fäden aus Kunststoff mit einer in einem Gehäuse drehbar angeordneten Extruderschnecke, einem Antriebsmotor und einem Extruderkopf. Es ist bekannt, in Extrudern Heizvorrichtungen anzuordnen, durch welche das zugeführte Kunststoffmaterial auf die für den Herstellungsprozeß günstigste Temperatur erwärmt wird. Bei der Herstellung von dünnen Folien und feinen Fäden muß die Temperatur im Extruderkopf sowie der dort herrschende Druck in engen Grenzen konstant gehalten werden.The invention relates to a control arrangement for extruders for the production of films or threads Made of plastic with an extruder screw rotatably arranged in a housing, a drive motor and an extruder head. It is known to arrange heating devices in extruders, through which the fed Plastic material is heated to the most favorable temperature for the manufacturing process. at The production of thin foils and fine threads requires the temperature in the extruder head as well as that there prevailing pressure can be kept constant within narrow limits.

Der Erfindung liegt die Aufgabe zugrunde, eine Regelanordnung zu schaffen, welche die Anforderungen für die Konstanthaltung von Druck und Temperatur im Extruder erfüllt. Zur Lösung der genannten Aufgabe wird gemäß der Erfindung vorgeschlagen, daß im Extruderkopf mindestens ein durch einen ersten Regler regelbares Heizelement und im Gehäuse weitere Heiz-' elemente angeordnet sind, die von einem zweiten Regler regelbar sind, dem als Sollwert die Temperaturdifferenz gegenüber der Temperatur des Extruderkopfes vorgegeben ist. Da Temperaturdifferenzen sehr genau gemessen werden können und ihre relativen Schwankungen verhältnismäßig groß sind, ermöglicht eine solche Anordnung eine sehr genaue Temperaturregelung. The invention is based on the object of a control arrangement to create what the requirements for keeping pressure and temperature constant met in the extruder. To solve the problem mentioned, it is proposed according to the invention that in Extruder head has at least one heating element that can be regulated by a first controller and further heating elements in the housing elements are arranged, which can be controlled by a second controller, the setpoint is the temperature difference is given in relation to the temperature of the extruder head. Because temperature differences are great can be measured accurately and their relative fluctuations are relatively large, enables such an arrangement provides very precise temperature control.

Nach einer Ausgestaltung der Erfindung weist der Antriebsmotor für die Extruderschnecke eine Drehzahlregelung mit unterlagerter Stromregelung auf, deren Führungsgröße der Druck im Extruderkopf ist. Eine weitere Ausführungsform der Erfindung besteht darin, daß der Sollwert für die Temperaturdifferenz zwischen Extruderkopf und dem Gehäuse in Abhängigkeit von der Drehzahl der Schnecke nachführbar ist.According to one embodiment of the invention, the drive motor for the extruder screw has a speed control with subordinate flow control, the reference variable of which is the pressure in the extruder head. One Another embodiment of the invention is that the target value for the temperature difference between Extruder head and the housing can be tracked depending on the speed of the screw.

Ein Ausführungsbeispiel der Erfindung ist nachstehend an Hand der Zeichnung erläutert.An embodiment of the invention is explained below with reference to the drawing.

In der Zeichnung ist mit 1 ein durch die Heizelemente 2, 3, 4 beheiztes Gehäuse bezeichnet, in welchem die Extruderschnecke 5 angeordnet ist, die von dem Antriebsmotor 6 angetrieben wird. Der Extruderkopf 7, aus welchem das Material den formgebenden Düsen zugeführt wird, enthält ebenfalls ein Heizelemente, welches über die Stelleinrichtung 9 gespeist wird. Zur Regelung des Heizelementes 8 dient der Regler 10, an dessen Eingang die Ausgangsgröße des Temperaturmeßumformers 11 liegt. Der Temperaturmeßumformer 11 ist mit einem Temperaturfühler 12 im Extruderkopf 7 verbunden. Der am Eingang des Reglers 10 liegende Sollwert S1 ist demnach die Solltemperatur im Extruderkopf. Der Sollwert S1 wird zusammen mit dem Sollwert S2, der die Solltemperaturdifferenz Δ ϋ-soii zwischen Extruderkopf und dem Gehäuse 1 darstellt, an den Eingang des Reglers 13 geführt, dessen Führungsgröße die Temperatur in der Nähe des Ausganges des Gehäuses 1 ist. Hierzu ist im Gehäuse 1 ein Temperaturfühler 14 angeordnet, der über einen Temperaturmeßumformer 15 auf den Regler 13 wirkt. Der Regler 13 wirkt seinerseits über die Steller für die Temperaturverteilung 16, 17, 18 auf die Stelleinrichtungen 19,20,21, mittels deren die Heizelemente 2,3,4 veränderbar sind. Die Stelleinrichtungen 9, 19, 20, 21, 22 können in bekannter Weise als Thyristorstelleinrichtungen ausgebildet sein.In the drawing, 1 denotes a housing which is heated by the heating elements 2, 3, 4 and in which the extruder screw 5, which is driven by the drive motor 6, is arranged. The extruder head 7, from which the material is fed to the shaping nozzles, also contains a heating element which is fed via the actuating device 9. The controller 10, at the input of which the output variable of the temperature measuring transducer 11 is located, is used to regulate the heating element 8. The temperature measuring transducer 11 is connected to a temperature sensor 12 in the extruder head 7. The setpoint S 1 at the input of the controller 10 is accordingly the setpoint temperature in the extruder head. The setpoint S 1 , together with the setpoint S 2 , which represents the setpoint temperature difference Δ ϋ-soii between the extruder head and the housing 1, is fed to the input of the controller 13, the reference variable of which is the temperature near the output of the housing 1. For this purpose, a temperature sensor 14 is arranged in the housing 1, which acts on the controller 13 via a temperature measuring transducer 15. The controller 13 in turn acts via the controller for the temperature distribution 16, 17, 18 on the setting devices 19, 20, 21, by means of which the heating elements 2, 3, 4 can be changed. The adjusting devices 9, 19, 20, 21, 22 can be designed in a known manner as thyristor adjusting devices.

Der Extruderkopf 7 enthält ferner einen Druckfühler 23 a, von dem über den Druckmeßumformer 23 derThe extruder head 7 also contains a pressure sensor 23 a, of which the pressure transducer 23 of the

ίο Eingang des Reglers 24 beaufschlagt wird. Als Sollwert S3 ist der Solldruck im Extruderkopf 7 dem Regler 24 vorgegeben. „Die Ausgangsgröße des Reglers 24 stellt den Sollwert der Drehzahl nsou dar, der zusammen mit dem Istwert der Drehzahl mst aus dem Dreh-ίο input of controller 24 is applied. The setpoint pressure in the extruder head 7 is given to the controller 24 as the setpoint S 3. "The output variable of the controller 24 represents the nominal value of the speed n so u , which together with the actual value of the speed m s t from the rotational speed

«5 zahlgeber25 dem Drehzahlregler 26 zugeführt wird. Dem Drehzahlregler 26 ist der Stromregler 27 nachgeschaltet, dessen Eingang zusätzlich der Iststromwert Iut zugeführt wird, welcher dem Drehzahlgeber 25 entnommen wird. Der Stromregler 27 wirkt auf die Stelleinrichtung 22, die zweckmäßig als Thyristorstelleinrichtung ausgebildet ist und den Speisestrom des Antriebsmotors 6 beeinflußt.«5 Zahlgeber25 is fed to the speed controller 26. The speed controller 26 is followed by the current controller 27, the input of which is additionally supplied with the actual current value Iut, which is taken from the speed sensor 25. The current regulator 27 acts on the adjusting device 22, which is expediently designed as a thyristor adjusting device and influences the feed current of the drive motor 6.

In manchen Fällen kann es zweckmäßig sein, den Sollwert S2, der die Temperaturdifferenz Δ &soii zwisehen Extruderkopf 7 und Gehäuse 1 des Extruders darstellt, entsprechend der Belastung des Antriebsmotors 6 nachzuführen. Hierzu dient ein Nachführgerät 28, welches in bekannter Weise, ζ. Β über einen Nachlaufmotor, in Abhängigkeit vom Drehzahl-Istwert nut die Stelleinrichtung für den Sollwert S2 verändert. In some cases it can be useful to adjust the setpoint S 2 , which represents the temperature difference Δ & so ii between the extruder head 7 and the housing 1 of the extruder, in accordance with the load on the drive motor 6. For this purpose, a tracking device 28 is used, which in a known manner, ζ. Β a follower motor, in dependence on the actual speed value nut, the adjusting device for the set value S 2 changes.

Claims (3)

Patentansprüche:Patent claims: 1. Regelanordnung für Extruder zur Herstellung von Folien oder Fäden aus Kunststoff mit einer in einem Gehäuse drehbar angeordneten Extruderschnecke, einem Antriebsmotor und einem Extruderkopf, dadurch gekennzeichnet, daß im Extruderkopf (7) mindestens ein durch einen ersten Regler (10) regelbares Heizelement (8) und im Gehäuse (1) weitere Heizelemente (2, 3, 4) angeordnet sind, die von einem zweiten Regler (13) regelbar sind, dem als Sollwert (S2) die Temperaturdifferenz {Δ ftsoii) gegenüber der Temperatur (&Son) des Extruderkopfes (T) vorgegeben ist.1. Control arrangement for extruders for the production of films or threads made of plastic with an extruder screw rotatably arranged in a housing, a drive motor and an extruder head, characterized in that in the extruder head (7) at least one heating element (8) which can be regulated by a first regulator (10) ) and 1) further heating elements (2, 3, 4) are arranged in the housing (which can be regulated by a second regulator (13), which as a setpoint value (S 2), the temperature difference {Δ ftsoii) versus temperature (& S on ) of the extruder head (T) is specified. 2. Regelanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Antriebsmotor (6) für die Extruderschnecke (5) eine Drehzahlregelung mit unterlagerter Stromregelung aufweist, deren Führungsgröße der Druck (Psoii) im Extruderkopf (7) ist.2. Control arrangement according to claim 1, characterized in that the drive motor (6) for the extruder screw (5) has a speed control with subordinate current control, the reference variable of which is the pressure (Psoii) in the extruder head (7). 3. Regelanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Sollwert (S2) für die Temperaturdifferenz {Δ dsoii) zwischen Extruderkopf (7) Und dem Gehäuse (1) in Abhängigkeit von der Drehzahl (mst) der Extruderschnecke (5) nachführbar ist.3. Control arrangement according to claim 1 or 2, characterized in that the setpoint (S 2 ) for the temperature difference {Δ d so ii) between the extruder head (7) and the housing (1) depending on the speed (m s t) of the Extruder screw (5) can be tracked.
DE19651554905 1965-10-12 1965-10-12 CONTROL ARRANGEMENT FOR EXTRUDER FOR THE PRODUCTION OF FILMS OR FEDES FROM PLASTIC Pending DE1554905B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0100022 1965-10-12

Publications (2)

Publication Number Publication Date
DE1554905A1 DE1554905A1 (en) 1970-01-22
DE1554905B2 true DE1554905B2 (en) 1971-10-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909870A1 (en) * 1979-03-09 1980-09-18 Siemens Ag Controlling extruder output rate - by heating or cooling grooved infeed section with decreasing or increasing output rate
DE3526050A1 (en) * 1985-07-20 1987-01-22 Krupp Gmbh METHOD FOR OPERATING AN EXTRUDER

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623679A1 (en) * 1986-07-12 1988-01-28 Werner & Pfleiderer METHOD FOR OPERATING A SNAIL EXTRUDER AND SNAIL EXTRUDER FOR IMPLEMENTING THE METHOD
CN111136886A (en) * 2019-12-31 2020-05-12 浙江亚设塑业有限公司 Film extrusion speed control device for plastic extrusion wire drawing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2909870A1 (en) * 1979-03-09 1980-09-18 Siemens Ag Controlling extruder output rate - by heating or cooling grooved infeed section with decreasing or increasing output rate
DE3526050A1 (en) * 1985-07-20 1987-01-22 Krupp Gmbh METHOD FOR OPERATING AN EXTRUDER

Also Published As

Publication number Publication date
DE1554905A1 (en) 1970-01-22

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