DE2909870A1 - Controlling extruder output rate - by heating or cooling grooved infeed section with decreasing or increasing output rate - Google Patents

Controlling extruder output rate - by heating or cooling grooved infeed section with decreasing or increasing output rate

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Publication number
DE2909870A1
DE2909870A1 DE19792909870 DE2909870A DE2909870A1 DE 2909870 A1 DE2909870 A1 DE 2909870A1 DE 19792909870 DE19792909870 DE 19792909870 DE 2909870 A DE2909870 A DE 2909870A DE 2909870 A1 DE2909870 A1 DE 2909870A1
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DE
Germany
Prior art keywords
output
output rate
heating
extruder
decreasing
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.)
Granted
Application number
DE19792909870
Other languages
German (de)
Other versions
DE2909870C2 (en
Inventor
Harald Dipl Ing Bender
Ulrich Ing Grad Triebsch
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
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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
Priority to DE2909870A priority Critical patent/DE2909870C2/en
Publication of DE2909870A1 publication Critical patent/DE2909870A1/en
Application granted granted Critical
Publication of DE2909870C2 publication Critical patent/DE2909870C2/en
Expired legal-status Critical Current

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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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/834—Cooling
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C2948/92466—Auxiliary unit, e.g. for external melt filtering, re-combining or transfer between units
    • 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
    • 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
    • B29C48/06—Rod-shaped

Abstract

Output and/or quality of an extruder having a grooved section adjacent the feed opening is/are controlled by cooling or heating the grooved section (12) with progressively increasing or decreasing output rate. Pref. the grooved section is provided with a temp. controlling thermocouple which is effective to induce the heating of the plasticised material when a transition from high output to low output, i.e. redn. of extruder worm screw speed takes place, is signalled. Cooling takes place when the opposite condition is established.

Description

Verfahren zum Verändern der AusstoßmengeMethod of changing the discharge amount

und/oder -aualität eines Extruders Die Erfindung bezieht sich auf ein Verfahren zum Verändern des Durchsatzes und Ausstoßes eines Extruders, der mit einer Nutenbuchse in seinem Einzugsbereich ausgerüstet ist.and / or -auality of an extruder The invention relates to a method for changing the throughput and output of an extruder that is connected to is equipped with a grooved bushing in its catchment area.

Für eine Vielzahl von Extrusionsprozessen ist es erwünscht, die Ausstoßmenge und/oder -qualität eines Extruders gezielt beeinflussen zu können. Insbesondere für die Aufrechterhaltung einer kontinuierlichen Fertigung ist ein Verringern und Wiederanheben der Extruderdrehzahl und damit des Extruderausstoßes notwendig, wie z. B. in der Kabelherstellung in den Fällen, in denen die hohe Fertigungsgeschwindigkeit ein fliegendes Verbinden zweier Trommellängen ohne Eingriff in den Extrusionsprozeß nur schwer ermöglicht.For a variety of extrusion processes, it is desirable to adjust the output rate and / or to be able to influence the quality of an extruder in a targeted manner. In particular to maintain continuous production is a decrease and Raising the extruder speed and thus the extruder output is necessary, such as z. B. in cable production in those cases where the high production speed a flying connection of two drum lengths without intervention in the extrusion process difficult to do.

Verändert man aber die Extruderdrehzahl, so verändert sich gleichzeitig auch der thermische Gleichgewichtszustand des Systems. Dabei nimmt der dissipative Energieanteil zu oder ab. Das führt zu einer teilweise drastischen Temperaturänderung im Extrudat. Das kann soweit gehen, daß die für die Produktion notwendigen Qualitätsgrenzen über- oder unterschritten werden.But if you change the extruder speed, it changes at the same time also the thermal equilibrium of the system. It takes the dissipative energy component increases or decreases. That leads to a sometimes drastic one Change in temperature in the extrudate. That can go as far as that for production necessary quality limits are exceeded or undercut.

Mit Hilfe von Kaskadenregelungen hat man bereits versucht, die Massetemperatur vor der Schneckenspitze und/oder des Extrudats zu beeinflussen bzw. zu regeln.With the help of cascade controls one has already tried to measure the mass temperature to influence or regulate before the screw tip and / or the extrudate.

Wegen der beteiligten großen Systemmassen, den damit verbundenen trägen Regelkreisen und wegen der schlechten Wärmeleitfähigkeit von Kunststoffen können derartige Systeme aber nur auf relativ langsame Temperaturänderungen reagieren. Außerdem ist mit einer Kaskadenregelung die mögliche Eingriffsbreite beschränkt.Because of the large system masses involved and the associated sluggishness Control loops and because of the poor thermal conductivity of plastics such systems only react to relatively slow changes in temperature. In addition, with a cascade control, the possible range of intervention is limited.

Weitere allgemein bekannte Lösungen arbeiten mit verstellbaren Drosselspalten entlang der Schnecke oder an der Schneckenspitze. Derartige Systeme reagieren zwar spontan, sind jedoch wegen maschinenbaulich schwer zu lösender Dichtprobleme und großer notwendiger Verstellkräfte sehr problematisch. Außerdem wird durch die hervorgerufene Drosselungsänderung der Ausstoß verändert.Other generally known solutions work with adjustable throttle gaps along the snail or at the tip of the snail. Such systems do react spontaneous, but are difficult to solve in terms of mechanical engineering and sealing problems large adjustment forces required very problematic. In addition, the evoked Throttling change the output changed.

Das führt in konventionellen Extrudern zu stark veränderten Homogenisierungsvorgängen.In conventional extruders, this leads to greatly changed homogenization processes.

Der Erfindung liegt daher die Aufgabe zugrunde, möglichst unter Zuhilfenahme der konventionellen Extruderbauweise Mittel und Wege aufzuzeigen, mit deren Hilfe die Ausstoßmenge, seine Qualität und auch die Drehzahl des Extruders beeinflußt werden können. Zur Lösung dieser Aufgabe wird gemäß der Erfindung vorgeschlagen, daß die Nutenbuchse für einen relativ abnehmenden Ausstoß erwärmt und für einen relativ zunehmenden Ausstoß gekühlt wird. Auch beim Ubergang zu geringeren Drehzahlen (geringerer Ausstoß) soll die Nutenbuchse erwärmt und beim Ubergang zu höheren Drehzahlen (höherer Ausstoß) gekühlt werden.The invention is therefore based on the object, if possible with the aid to show the conventional extruder design ways and means with their help influences the output quantity, its quality and also the speed of the extruder can be. To solve this problem it is proposed according to the invention, that the grooved sleeve is heated for a relatively decreasing output and for one relatively increasing output is cooled. Even when transitioning to lower speeds (lower output) should heat the grooved bushing and when transitioning to higher speeds (higher output) be cooled.

Einzige Voraussetzung für die Anwendbarkeit der Erfindung ist der Einsatz eines Extruders mit genuteter Einzugsbuchse, die intensiv temperierbar gestaltet ist, und außerdem mit einer Schnecke mit guter Aufschließ- und Homogenisierungswirkung ausgerüstet ist. Die Gestaltung der Nuten im Bereich der Einzugsbuchse ist dabei so, daß unterschiedliche Temperaturen des Temperierungsmediums (z. B. Wasser, Ol oder ein anderes Wärmeträgermedium in einem geregelten, offenen oder geschlossenen Kreislauf) gut auf das eingezogene Material durchgreifen, und zwar sowohl im Hinblick auf eine Verschiebung des Aufschmelzbeginns im Extruder als auch durch eine sich verändernde Förderaktivität des Einzugsteiles. Mit Hilfe dieses Verfahrens erreicht man eine relativ spontan reagierende Beeinflussung bzw. Steuerung der Schmelzetemperatur.The only requirement for the applicability of the invention is Use of an extruder with a grooved feed bush, which is designed to be temperature-controlled is, and also with a screw with good opening and homogenizing effect is equipped. The design of the grooves in the area of the pull-in bush is included so that different temperatures of the temperature control medium (e.g. water, oil or another heat transfer medium in a regulated, open or closed Circulation) take good care of the drawn-in material, both in terms of to a shift in the start of melting in the extruder as well as by itself changing conveying activity of the catchment part. Achieved with the help of this procedure one has a relatively spontaneously reacting influence or control of the melt temperature.

Die #esentliche Erkenntnis der Erfindung ist demnach darin zu sehen, durch Temperaturveränderungen einer gut temperierbaren, genuteten Einzugsbuchse den Ausstoß eines Extruders und die Extruderqualität deutlich zu verändern. Eine solche Veränderung führt schon bei konstanter Extruderdrehzahl zu einer Änderung des Schmelzeausstoßes und der Schmelzetemperatur. Dieser Effekt kann aber auch bei notwendigen größeren Drehzahlveränderungen herangezogen werden, um die aus den großen Drehzahl sprüngen resultierende starke Veränderung des dissipativen Energieanteils dadurch zu reduzieren, daß ein so großer Drehzahlsprung einerseits nicht mehr in diesem Maße notwendig ist und andererseits durch Verlagerung des Aufschmelzbeginns im gleichen Sinne beeinflußt wird.The # essential knowledge of the invention can therefore be seen in due to temperature changes in a grooved pull-in bushing that can be easily adjusted to its temperature to significantly change the output of an extruder and the extruder quality. One Such a change leads to a change even at a constant extruder speed the melt output and the melt temperature. However, this effect can also be achieved with necessary larger speed changes are used to get those from the large Speed jumps resulting in a strong change in the dissipative energy component to reduce by the fact that such a large jump in speed on the one hand no longer in this measure is necessary and, on the other hand, by shifting the start of melting is influenced in the same sense.

In Ausgestaltung des Erfindungsgedankens kann man bei einem rechnergesteuerten Extruder den Einfluß der Temperierung der Nutenbuchse auf Ausstoß- und Extrudat- temperatur meßtechnisch festhalten und wieder in den Prozeß einbringen. Es ist damit möglich, einen relativ großen Ausstoßbereich, z. B. ein Verhältnis von 1 : 10, mit deutlich geringeren Drehzahl sprüngen und im Verhältnis zur unbeeinflußten Betriebsweise deutlich geringeren Massetemperaturänderungen zu realisieren. Dies ist insbesondere für eine qualitativ gleichbleibende, kontinuierliche, aber mit Ausstoßveränderungen behaftete Fertigung notwendig.In an embodiment of the inventive concept, one can use a computer-controlled Extruder the influence of the temperature control of the grooved bushing on the discharge and extrudate temperature Metrologically hold it and bring it back into the process. It is thus possible a relatively large discharge area, e.g. B. a ratio of 1:10, with clear jumps lower speed and in relation to the unaffected mode of operation to realize significantly lower mass temperature changes. This is particular for constant quality, continuous, but with output changes afflicted manufacturing necessary.

Zur Erläuterung der Erfindung dient das in der Zeichnung dargestellte Prinzipbild.The illustration shown in the drawing serves to explain the invention Principle picture.

Die einzige Figur zeigt das Schemabild eines Extruders 10 und seines Spritzkopfes 20. Darin ist der zu beschichtende Leiter mit 8 und der beschichtete Leiter mit 9 bezeichnet.The single figure shows the schematic diagram of an extruder 10 and its Spray head 20. There is the conductor to be coated with 8 and the coated one Head with 9 designated.

Der Extruderschnecke 16 wird leber den Trichter 11 das erforderliche Material des Extrudats zugeführt. Der Extruder weist im wesentlichen eine genutete und mit Hilfe eines Temperaturregelkreises 16 intensiv temperierbare Einzugsbuchse 12 und eine Reihe heiz- und kühlbarer Zonen 14 auf. Im Bereich der Schneckenspitze dient eine Meßvorrichtung 15 zur Bestimmung der Massetemperatur an der Schneckenspitze. Eine entsprechende Vorrichtung 25 ist für die Ermittlung der Massetemperatur des Extrudats vorgesehen.The extruder screw 16 will liver the funnel 11 the required Material of the extrudate fed. The extruder is essentially grooved and with the help of a temperature control circuit 16 intensively temperature-controllable draw-in bushing 12 and a number of heatable and coolable zones 14. In the area of the snail tip A measuring device 15 is used to determine the mass temperature at the screw tip. A corresponding device 25 is for determining the mass temperature of the Extrudate provided.

1 Figur 3 Ansprüche L e e r s e i t e1 Figure 3 claims L e r s e i t e

Claims (3)

Pa tentanstrüche Verfahren zum Verändern der Ausstoßmenge und/oder alität eines E#truders, der mit einer Nutenbuchse in einem Einzugsbereich ausgerüstet ist, d a d u r c h g e k e n n z e i c h n e t , daß die Nutenbuchse (12) für einen relativ abnehmenden Ausstoß erwärmt und für einen relativ zunehmenden Ausstoß gekühlt wird.Pa tentanstrüche method for changing the output quantity and / or ality of an E # truder equipped with a grooved bushing in a feed area is that the grooved bushing (12) for a heated for relatively decreasing output and cooled for relatively increasing output will. 2. Verfahren nach Anspruch 1, d a d u r c h g e -k e n n z e i c h n e t , daß die Nutenbuchse (12) beim Uebergang zu geringeren Drehzahlen (geringerer Ausstoß) erwärmt und beim Ubergang zu höheren Drehzahlen (höherer Ausstoß) gekühlt wird.2. The method according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the grooved bushing (12) at the transition to lower speeds (lower Output) and cooled when transitioning to higher speeds (higher output) will. 3. Verfahren nach Anspruch 1 oder 2 für rechnergesteuerten Extruder, d a d u r c h g e k e n n z e i c h -n e t , daß der Einfluß der Temperierung der Nutenbuchse (12) auf die Sxtrudattemperatur meßtechnisch festgehalten und wieder in den Prozeß eingebracht wird.3. The method according to claim 1 or 2 for computer-controlled extruders, d a d u r c h e k e n n n z e i c h -n e t that the influence of the temperature control of the Grooved bushing (12) recorded on the extrudate temperature by measurement and again is brought into the process.
DE2909870A 1979-03-09 1979-03-09 Method for controlling the output rate of an extruder for plastics Expired DE2909870C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2909870A DE2909870C2 (en) 1979-03-09 1979-03-09 Method for controlling the output rate of an extruder for plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2909870A DE2909870C2 (en) 1979-03-09 1979-03-09 Method for controlling the output rate of an extruder for plastics

Publications (2)

Publication Number Publication Date
DE2909870A1 true DE2909870A1 (en) 1980-09-18
DE2909870C2 DE2909870C2 (en) 1985-09-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1939248A1 (en) * 1969-08-01 1971-02-11 Metallgesellschaft Ag Arrangement for temperature control of melt extruders
DE1554905B2 (en) * 1965-10-12 1971-10-28 Siemens AG, 1000 Berlin u. 8000 München CONTROL ARRANGEMENT FOR EXTRUDER FOR THE PRODUCTION OF FILMS OR FEDES FROM PLASTIC
US3733059A (en) * 1971-08-10 1973-05-15 Rosemount Inc Plastic extruder temperature control system
DE2119136B2 (en) * 1971-04-20 1974-06-06 Gerhard Prof. Dr.-Ing. 7000 Stuttgart Schenkel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1554905B2 (en) * 1965-10-12 1971-10-28 Siemens AG, 1000 Berlin u. 8000 München CONTROL ARRANGEMENT FOR EXTRUDER FOR THE PRODUCTION OF FILMS OR FEDES FROM PLASTIC
DE1939248A1 (en) * 1969-08-01 1971-02-11 Metallgesellschaft Ag Arrangement for temperature control of melt extruders
DE2119136B2 (en) * 1971-04-20 1974-06-06 Gerhard Prof. Dr.-Ing. 7000 Stuttgart Schenkel
US3733059A (en) * 1971-08-10 1973-05-15 Rosemount Inc Plastic extruder temperature control system

Also Published As

Publication number Publication date
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