DE2208238A1 - Tempering device - for a twin screw extruder comprising coolant bore holes around the screw boreholes - Google Patents
Tempering device - for a twin screw extruder comprising coolant bore holes around the screw boreholesInfo
- Publication number
- DE2208238A1 DE2208238A1 DE2208238A DE2208238A DE2208238A1 DE 2208238 A1 DE2208238 A1 DE 2208238A1 DE 2208238 A DE2208238 A DE 2208238A DE 2208238 A DE2208238 A DE 2208238A DE 2208238 A1 DE2208238 A1 DE 2208238A1
- Authority
- DE
- Germany
- Prior art keywords
- tempering
- boreholes
- cylinder
- screw
- twin screw
- 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
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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
- B29C48/682—Barrels or cylinders for twin screws
-
- 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
- B29C48/03—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
Abstract
Description
Temperiereinrichtung Die Erfindung bezieht sich auf eineTernperiereinrichtung für Zylinder, vorzugsweise von Doppelschneckenextrudern. Temperature control device The invention relates to a temperature control device for cylinders, preferably of twin screw extruders.
Bei der Verarbeitung von Kunststoffen wird durch die intensive Scherung der Masse während der Plastifizierung oft eIn grosser Teil mechanischer Energie in Wärme umgewandelt. Diese Wärme erhöht die Massetemperatur unzulass.sg stark, was zur Schddigung der Eigenschaften des Plastifikats sowie zu weiteren Verarbeitungsschwieriakitn führen kann.When processing plastics, the intensive shear Often a large part of mechanical energy of the mass during plasticization converted into heat. This heat increases the mass temperature inadmissibly, resulting in damage to the properties of the plasticate and further processing difficulties can lead.
Es ist bereits vorgeschlagen worden, Temperiereinrichtungen für Extruder vorzusehen. So wurde beispielsweise mit den DBP 1267833 eine Vorrichtung vorgeschlagen, die es ermöglicht, den Wärmeüberschuss der Meteringzone einer Extruderschnecke zum Aufheizen des kalten Materials in der Einlaufzone zu nutzen.It has already been proposed that temperature control devices for extruders to be provided. For example, with the DBP 1267833 a device was proposed, which makes it possible to use the excess heat of the metering zone of an extruder screw Use the heating of the cold material in the inlet zone.
Ausserdem ist es bekannt, den Zylinder des Extruders von aussen zu temperieren und zwar mittels Kühlmäntel Kühlschlangen usw. Besonders bei Doppelschneckenextrudern tritt in der Druckbildungszone an den Schneiden der ineinanderlaufenden Bohrungen eine erhöhte Material scherung und damit auch eine starke Temperaturerhöhung auf. Der Weg, den die Wärme bis zur Zylinderoberfläche von diesen Schneiden zurücklegen muss, ist erheblich länger als der Weg, den die Wärme von anderen Punkten der Bohrung zur Oberflache zurückzulegen hat. Dies ist durch die Geometrie der Doppelscbneckenzylinder bedingt, die aussen rund sind-und innen zwei ineinanderlaufende Bohrungen für die Schnecken aufweisen.It is also known to close the barrel of the extruder from the outside control the temperature by means of cooling jackets, cooling coils, etc. Especially with twin-screw extruders occurs in the pressure-forming zone at the cutting edges of the holes that run into one another an increased material shear and thus a strong increase in temperature. The path that the heat takes to the cylinder surface from these Cut has to travel is considerably longer than the path taken by the heat from other points the hole has to cover to the surface. This is due to the geometry of the twin screw cylinder conditionally, the outside are round and inside two holes for the Have snails.
Das Entstehen eines Wärmestaues wäre auch durch das Üherschneiden der radial abfliessenden Wärme von den Zylinderbohrungen selbst dann nicht zu verhindern, wenn gleiche Wurmedurchtrittsflächen vorhanden wären und gleiche Wärme dichte an der ganzen Bohrungsoberfläche entstehen würde, wobei noch die Aussenkontur des Zylinders der der Innenkontur der Zylinderbohrung entsprechen müsste.The creation of a build-up of heat would also be due to overcutting not to prevent the radially escaping heat from the cylinder bores even then, if there were the same worm passage areas and the same heat seal the entire surface of the bore would arise, with the outer contour of the cylinder which would have to correspond to the inner contour of the cylinder bore.
Um gleiche Wärmedurchtrittsflächen zu erhalten, wird daher mit der Erfindung vorgeschlagen, in das Gebiet der grössten Wärmedichte, also dem Gebiet der Schneiden, dort, wo die beiden Bohrungen ineinander übergehen, Temperlerbohrungen parallel zur Schneide vorzusehen und diese mit einem Temperiermedium zu durchströmen.In order to obtain the same heat transfer areas, the Invention proposed in the area of greatest heat density, so the area the cutting edge, where the two holes merge, are temperer holes to be provided parallel to the cutting edge and to flow through it with a temperature control medium.
Eine Ausführungsvariante der Erfindung sieht vor, dass eine qrössere Anzahl solcher Temperierbohrungen in gleichen Abstand von der Bohrungsobcrfläche um die gesamte Kontur der Zylinderbohrung herura angeordnet sind.One embodiment of the invention provides that a larger Number of such tempering holes at the same distance from the hole surface are arranged around the entire contour of the cylinder bore herura.
Somit ist es möglich, die extrem hohen Temperaturgradienten zu steuern. Überhitzungen des Plastifikats werden also sicher vermieden.It is thus possible to control the extremely high temperature gradients. Overheating of the plastic is thus reliably avoided.
Die rfindung ist nachstehend anhand eines in den Abbildungen Hargestellien Ausführungsbeispieles näher erläutert Es zeigt: Figur 1 - einen Schnitt durch den Zylinder eines Doppelschneckenextruders Figur 2 - einen Schnitt durch Figur 1 und Figur 3 - eine Ausführungsvariante.The invention is shown below using one of the illustrations in Hargelien Exemplary embodiment explained in more detail. It shows: Figure 1 - a section through the Cylinder of a twin screw extruder Figure 2 - a section through Figure 1 and Figure 3 - an embodiment.
Ein Beispiel für die Anwendung der Erfindung bei einet Doppelschneckenextruder zeigt die Abbildung 1. Die Anwendung des Systems ist jedoch nicht auf dieses Beispiel beschränkt, sonnern bei jeder Art von solchen Zylindern anwendbar. Das Beispiel Doppelschneckenextruder wird deshalb gewählt, weil das Temperieren eines derartigen Zylinders besonders schwierig ist und die mit der Erfindung erzielbaren Vorteile offensichtlich sind, In der Meteringzone des Zylinders tritt, bedingt durch die dort entstehende Friktionswärme, eine sehr starke Temperaturerhöhung auf, die durch ein Kühlmedium abgeführt werden dass. Der Schnitt durch den Zylinder 1 zeigt die zwei ineinanderlaufenden Schneckenbohrungen 2 und 3.An example of the application of the invention to a twin screw extruder Figure 1 shows. However, the application of the system is not applicable to this example limited, but applicable to any type of cylinder of this type. The example Twin screw extruder is chosen because the temperature control of such Cylinder is particularly difficult and the advantages that can be achieved with the invention are obvious, in the metering zone of the cylinder occurs, due to the there resulting frictional heat, a very strong increase in temperature caused by a cooling medium can be discharged that. The section through the cylinder 1 shows the two screw bores 2 and 3 running into one another.
Der Zylinder 1 weist daher starke Wanddickenunterschiede auf. Wärme, die von der Schneckenbohrungswand der Schnecken-Bohrungen und 3-nach aussen abfliesst, hat also unterschiedlich lange Wege zu passieren, wobei durch den Zeitfaktor an verschiedenen Stellen ein Wärmestau auftritt.The cylinder 1 therefore has large differences in wall thickness. Warmth, which flows from the screw bore wall of the screw bores and 3-to the outside, So has different long ways to pass, whereby due to the time factor heat build-up occurs in various places.
Friktionswärme entsteht nämlich besonders an den Stellen, die vcir der Aussenwand des Zylinders 1 am weitesten entfernt sind, das heisst an den Schneiden 4 und 5, wo die beiden Schneckenbohrungen 2 und 3 ineinander laufen.Namely, frictional heat is created especially in the areas the vcir are furthest away from the outer wall of the cylinder 1, that is to say at the Cut 4 and 5, where the two screw holes 2 and 3 run into each other.
Dort findet bekanntlich der Druckaufbau und die grösste Scherung des Plastiflkats gleichzeitig statt.It is there that the pressure build-up and the greatest shear of the Plastiflkats take place at the same time.
Erfindungsgemäss wird die Schichtdicke 8 von den Schneiden 4, 5 zur Aussenfläche des Zylinders 1 durch Temperierbohrungen 6 und 7 längs des Schneckenzylinders verringert. Die Tmperierhohrungen 6 ud 7 sind von einem Temperiermedium durchflossen. Somit braucht die Friktionswärine nicht erst nach aussen geleitet zu werden, sondern wird durch das Temperiermedium in den Bohrungen 6 und 7 schnell abgeleitet.According to the invention, the layer thickness 8 from the cutting edges 4, 5 to Outer surface of the cylinder 1 through temperature control bores 6 and 7 along the screw cylinder decreased. The temperature control holes 6 and 7 have a temperature control medium flowing through them. This means that the heat of friction does not need to be directed to the outside first, but rather is quickly diverted by the temperature control medium in bores 6 and 7.
Durch Verlängerung der Temperierbohrurgen 6 und 7 kann gleichzeitig die kalte, in die Maschine eintretende Masse aufgeheizt werden, so dass die Wärmeenergie nicht verloren geht.By lengthening the temperature control bores 6 and 7, you can simultaneously the cold mass entering the machine is heated up, so that the thermal energy is not lost.
Mit 8 und 9 ist je ein Verschluss und mit 10, 11, 12 und 13 Zu- bzw. Abflussbohrungen für das Temperiermedium bezeichnet.With 8 and 9 there is a lock and with 10, 11, 12 and 13 lock or lock. Designated drain holes for the temperature control medium.
Bei der in Figur 3 dargestellten Ausführungsvariante sind die Schneckenbohrungen 15 und 16 in dem Zylinder 14 von einer Anzahl Temperierbohrungen 17, die sämtlich gleichen Abstand von der Oberfläche der Schneckenbohrungen 15 und 16 besitzen, eingerahmt.In the embodiment variant shown in FIG. 3, the screw bores are 15 and 16 in the cylinder 14 of a number of tempering bores 17, all of which have the same distance from the surface of the screw bores 15 and 16, framed.
Bei dieser Ausführungsvariante wird ein besonders hoher Grad der Temperierung der Zylinderbohrungen 15 und 16 erreicht, da das Temperiermedium dicht an deren Oberfläche die entstehende Wärme rasch abführt. Die schädlichen lokal begrenzten Überhitzungen sind somit neutralisiert.In this embodiment variant, a particularly high degree of temperature control is achieved of the cylinder bores 15 and 16 reached because the temperature control medium close to their Surface quickly dissipates the heat generated. The harmful ones local limited overheating are thus neutralized.
Bei anderen Schneckenbohrungen bzw. Düsenformen ist die Anorunllng der Temperierbohrungen für das Temperiermedium ohne weiteres diesen anzupassen.In the case of other screw bores or nozzle shapes, the alignment is the temperature control bores for the temperature control medium easily adapt this.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2208238A DE2208238A1 (en) | 1972-02-22 | 1972-02-22 | Tempering device - for a twin screw extruder comprising coolant bore holes around the screw boreholes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2208238A DE2208238A1 (en) | 1972-02-22 | 1972-02-22 | Tempering device - for a twin screw extruder comprising coolant bore holes around the screw boreholes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2208238A1 true DE2208238A1 (en) | 1973-08-30 |
Family
ID=5836690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2208238A Pending DE2208238A1 (en) | 1972-02-22 | 1972-02-22 | Tempering device - for a twin screw extruder comprising coolant bore holes around the screw boreholes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2208238A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0042466A1 (en) * | 1980-06-23 | 1981-12-30 | HERMANN BERSTORFF Maschinenbau GmbH | Temperature-controllable housing for a double-screw extruder |
DE3045889A1 (en) * | 1980-07-14 | 1982-02-11 | Piero Bandera | Efficient cooling for double-screw extruder - by having two coolant bores on vertical centre line contg. divided low pitch screws |
FR2582252A1 (en) * | 1985-05-25 | 1986-11-28 | Berstorff Gmbh Masch Hermann | ENDLESS EXTRUSION PRESS INCLUDING A THERMAL CYLINDER STABILIZATION DEVICE |
AT391654B (en) * | 1981-10-22 | 1990-11-12 | Cincinnati Milacron Inc | DEVICE FOR EXTRUDING PLASTIC |
US5549383A (en) * | 1990-11-03 | 1996-08-27 | Werner & Pfleiderer, Gmbh | Screw-type extrusion machine with heating elements |
WO2001014121A1 (en) * | 1999-08-24 | 2001-03-01 | Berstorff Gmbh | Cylinder for a twin-screw extruder |
-
1972
- 1972-02-22 DE DE2208238A patent/DE2208238A1/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0042466A1 (en) * | 1980-06-23 | 1981-12-30 | HERMANN BERSTORFF Maschinenbau GmbH | Temperature-controllable housing for a double-screw extruder |
DE3045889A1 (en) * | 1980-07-14 | 1982-02-11 | Piero Bandera | Efficient cooling for double-screw extruder - by having two coolant bores on vertical centre line contg. divided low pitch screws |
AT391654B (en) * | 1981-10-22 | 1990-11-12 | Cincinnati Milacron Inc | DEVICE FOR EXTRUDING PLASTIC |
FR2582252A1 (en) * | 1985-05-25 | 1986-11-28 | Berstorff Gmbh Masch Hermann | ENDLESS EXTRUSION PRESS INCLUDING A THERMAL CYLINDER STABILIZATION DEVICE |
US5549383A (en) * | 1990-11-03 | 1996-08-27 | Werner & Pfleiderer, Gmbh | Screw-type extrusion machine with heating elements |
WO2001014121A1 (en) * | 1999-08-24 | 2001-03-01 | Berstorff Gmbh | Cylinder for a twin-screw extruder |
US6805480B1 (en) * | 1999-08-24 | 2004-10-19 | Berstorff Gmbh | Cylinder for a twin-screw extruder with a helical channel of varying depth |
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