DE2744583A1 - Twin-screw extruder with intermeshing mixing cams at metering section - to achieve complete compounding and avoid inhomogeneities of plastics melt - Google Patents

Twin-screw extruder with intermeshing mixing cams at metering section - to achieve complete compounding and avoid inhomogeneities of plastics melt

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Publication number
DE2744583A1
DE2744583A1 DE19772744583 DE2744583A DE2744583A1 DE 2744583 A1 DE2744583 A1 DE 2744583A1 DE 19772744583 DE19772744583 DE 19772744583 DE 2744583 A DE2744583 A DE 2744583A DE 2744583 A1 DE2744583 A1 DE 2744583A1
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Germany
Prior art keywords
cams
screw
screw extruder
twin
screws
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.)
Ceased
Application number
DE19772744583
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German (de)
Inventor
Heinz Dipl Ing Weber
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to DE19772744583 priority Critical patent/DE2744583A1/en
Publication of DE2744583A1 publication Critical patent/DE2744583A1/en
Ceased 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
    • B29B7/483—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs the other mixing parts being discs perpendicular to the screw axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/486—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with screws surrounded by a casing provided with grooves or cavities
    • 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
    • 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
    • B29C48/05—Filamentary, e.g. strands

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Twin-screw extruder has a mixer, in form of cams at the screws and counter-cams at the barrel, adjacent the metering zone in machine direction. The cams at the 1st screw extends, near its shortest distant from the 2nd screw, into the circle of sweep of the 2nd screw whose cams extend into the circle of sweep of the 1st screw. Max. homogenizing efficiency adjacent the metering zone is achieved, to complete exclusion of differences in the characteristics of the strands produced by the 2 screws.

Description

"Doppelschneckenextruderw "Twin screw extruder

Um an der Düse eines Doppelschneckenextruders eine optimal durchmischte Kunststoff-Schmelze zu erhalten, ist empfohlen worden, anschließend an die Meteringzone des Extruders eine Einrichtung zur zusätzlichen Durchmischung und damit verbundener Feinplastifizierung vorzusehen. Diese Zusatzmischeinrichtung war mittels je eines die Schnecke zur Düse verlängernden zylindrischen Ansatzes mit radial nach außen vorstehenden Nocken sowie Gegennocken am Schneckenzylinder gebildet worden. Die Ansätze durchsetzten Büchsen, welche die Gegennocken trugen, die radial nach innen ragten und mit den Nocken an den Schnecken zusammenwirkten. Bei dem bereits vorgeschlagenen Doppelschneckenextruder mit einer an die Meteringzone anschließenden Zusatzmischeinrichtung wurden die Kunststoffstränge in der Zusatzmischeinrichtung völlig getrennt voneinander gehalten. Weil die Radialkräfte im Bereich der Schneckenspitze von den Büchsen mit den Gegennokken aufgenommen wurden, ergab sich eine relativ leichte Bauweise des Extruders. Es mußte allerdings in Kauf genommen werden, daß die Bohrungen für die Schnecken mit den Gegennocken im Durchmesser kleiner bemessen werden mußten als im Bereich der Meteringzone.In order to achieve an optimally mixed at the nozzle of a twin screw extruder Melting plastic has been recommended following the metering zone of the extruder a device for additional mixing and associated Fine plasticization to be provided. This additional mixing device was by means of one each the screw to the nozzle lengthening cylindrical extension with radially outward protruding cams and counter cams have been formed on the screw cylinder. the Lugs penetrated bushings, which carried the counter-cams, which were radially inward and cooperated with the cams on the snails. With the one already proposed Twin screw extruder with an additional mixing device connected to the metering zone the plastic strands were completely separated from each other in the additional mixer held. Because the radial forces in the area of the screw tip from the bushes the Gegenennokken were recorded, resulted in a relatively light construction of Extruders. It had to be accepted, however, that the holes for the Screws with the counter cams had to be dimensioned smaller in diameter than in the area of the metering zone.

Die Tatsache, daß bei dem früher vorgeschlagenen Doppelschneckenextruder die Kunststoffstränge in der zusätzlichen Durchmischungseinrichtung getrennt gehalten werden, kann sich u.U. dahingehend auswirken, daß der Kunststoffstrang der einen Schnecke beispielsweise in der Temperatur von dem Kunststoffstrang der anderen Schnecke abweicht. Dies könnte etwa dann der Fall sein, wenn die Kühlung der einen Schnecke - aus welchen Gründen auch immer - von der Kühlung der anderen Schnecke abweicht.The fact that in the previously proposed twin screw extruder the plastic strands are kept separate in the additional mixing device can have the effect that the plastic strand of one Screw, for example, in the temperature of the plastic strand of the other screw deviates. This could be the case, for example, when the cooling of one screw - for whatever reason - differs from the cooling of the other screw.

Der Erfindung liegt die Aufgabe zugrunde, einen Doppelschnekkenextruder mit zusätzlicher Durchmischuiigseinrichtung anschlieP#nd an die Meteringzone zu schaffen, der die Entste-I#ung unterschiedlicher Eigenschaften der Kunststoffstränge der beiden Schnecken ausschließt.The invention is based on the object of a twin-screw extruder with additional mixing equipment then to the metering zone create the development of different properties of the plastic strands which excludes the two snails.

Zur Lösung der Erfindungsaufgabe wird ausgegangen von einem Doppelschneckenextruder mit an die Meteringzone in Richtung zur Düse anschließendem Mischer in Form von Nocken an den Schnecken und Gegennocken am Zylinder. An einem solchen Doppclschneckenextruder besteht die Erfindung in der Ausbildung derart, daß die Nocken an der ersten Schnecke im Bereich der kürzesten Entfernung derselben von der zweiten Schnecke in den Flugkreis der zweiten Schnecke und deren Nocken in den Flugkreis der ersten Schnecke ragen. Dabei ist es günstig, wenn die Nocken der einen Schnecke in kämmendem Eingriff mit den Nocken der anderen Schnecke stehen.To achieve the object of the invention, a twin-screw extruder is assumed with a mixer following the metering zone in the direction of the nozzle in the form of Cams on the screws and counter-cams on the cylinder. On such a twin-screw extruder the invention consists in the formation such that the cams on the first screw in the area of the shortest distance of the same from the second screw in the flight circle of the second worm and its cams protrude into the flight circle of the first worm. It is advantageous if the cams of one worm are in meshing engagement with the cam of the other snail.

Besonders vorteilhaft ist es darüberhinaus, wenn die Bohrungen im Schneckenzylinder im Bereich der Nocken an deren Grund den gleichen Durchmesser aufweisen wie in der Meteringzone.In addition, it is particularly advantageous if the bores in the Screw cylinders in the area of the cams have the same diameter at their base as in the metering zone.

Wie durchgeführte Versuche gezeigt haben, ergibt sich mit erfindungsgemäßen Doppelschneckenextrudern im Zusatzmischerbereich eine völlig gleichmäßige Schmelze, selbst unter ungünstigen Verhältnissen, wenn etwa die Kühlung einer Schnecke völlig ausfällt. Hinzu kommt, daß der Durchmesser der Bohrungen für die Ziegel im Grund der Nocken mit dem Durchmesser der Schneckenzylinderbohrungen und der Durchmesser der Kerne der ~gel" mit dem Durchmesser der Schnecken im Schneckengrund praktisch übereinstimmt. Auch wird die Herstellung des Doppelschneckenextruders wesentlich vereinfacht.As carried out tests have shown, results according to the invention Twin screw extruders in the additional mixer area a completely uniform melt, even under unfavorable conditions, such as when a snail is completely cooled fails. In addition, the diameter of the holes for the brick in the ground the cam with the diameter of the screw cylinder bores and the diameter the cores of the "gel" with the diameter of the snail in the bottom of the snail are practical matches. The manufacture of the twin screw extruder also becomes essential simplified.

Die Erfindung ist nachstehend an Hand der Zeichnung erläutert.The invention is explained below with reference to the drawing.

Es zeigen: Fig. 1 einen Längsschnitt durch den vorderen Teil eines Doppelschneckenextruders, Fig. 2 einen Schnitt entlang der Linie II-II in Fig. 1.1 shows a longitudinal section through the front part of a Twin-screw extruder, FIG. 2 shows a section along the line II-II in FIG. 1.

Der Doppelschneckenextruder weist die Schnecken 1 und 2 in den Bohrungen 3 und 4 des Schneckenzylinders 5 auf. Anschliessend an die Meteringzone 6 ist an jede Schnecke 1, 2 ein in Richtung zur Extruderdüse sich erstreckender, im wesentlichen zylindrischer Ansatz 7 bzw. 8 angebracht, der jeweils in die Schneckenspitze 9 bzw. 10 ausläuft. Die Bohrungen 3, 4 gehen im Bereich der Ansätze 7, 8 in die Bohrungen 11, 12 über, deren Durchmesser völlig mit demjenigen der Bohrungen 3, 4 übereinstimmt.The twin screw extruder has screws 1 and 2 in the bores 3 and 4 of the screw cylinder 5. Following the metering zone 6 is on each screw 1, 2 is a substantially extending in the direction of the extruder nozzle cylindrical extension 7 or 8 attached, each in the screw tip 9 or 10 expires. The holes 3, 4 go into the holes in the area of the approaches 7, 8 11, 12 above, the diameter of which completely coincides with that of the bores 3, 4.

Die Schnecken 1, 2 und auch die Ansätze 7, 8 sind zur Innenkühlung hohl ausgebildet.The screws 1, 2 and also the lugs 7, 8 are for internal cooling hollow.

Jeder Ansatz 7, 8 weist nach außen vorstehende Nocken auf, die weitgehend den Stacheln eines Igelfisches entsprechen.Each approach 7, 8 has outwardly projecting cams that largely correspond to the spines of a porcupine fish.

Diese Nocken, die am Ansatz 7 mit 17 und am Ansatz 8 mit 18 bezeichnet sind, sind beim gezeigten Ausführungsbeispiel an den Ansätzen gleichmäßig verteilt angeordnet. Zwischen je zwei Nocken ist eine Lücke, etwa 19 und 20 vorhanden. Diese Lücken sind so bemessen, daß ein Nocken mit Spiel einragen kann.These cams, denoted by 17 on the approach 7 and 18 on the approach 8 are, in the embodiment shown, are evenly distributed at the approaches arranged. There is a gap, approximately 19 and 20, between every two cams. These Gaps are dimensioned so that a cam can protrude with play.

An der Verlängerung 21 mit den Bohrungen 11 bzw. 12 sind radial nach innen ragende Gegennocken 23, 24 angebracht. Auch sie sind sowohl in axialer Richtung der Bohrungen als auch in Umfangsrichtung derselben mit Lücken 25 bzw. 26 zwischen sich nach Art der Stacheln eines Igelfisches angeordnet. Die Höhe H der Gegennocken stimmt bei dem gezeigten Ausführungsbeispiel etwa mit der Höhe H1 der Nocken überein. Die rechtwinklig zu der Längserstreckung der Ansätze verlaufenden Ebenen, in welchen die Nocken 17 angeordnet sind, fluchten mit den gleichfalls rechtwinklig zu den Ansätzen verlaufenden Ebenen, in welchen die Nocken 18 angeordnet sind. Infolgedessen kommen die Nocken 17 jeweils im Bereich des kürzesten gegenseitigen Abstandes der Schnecken 1, 2 in Eingriff mit den Nocken 18. Es kämmen also die Nocken der einen Schnecke mit den Nocken der anderen Schnecke. Die Kunststoffmasse wird infolgedessen nicht in getrennten Strängen gehalten, vielmehr zusätzlich innig durchmischt und plastifiziert. Die Durchmischung erfolgt also nicht nur zwischen den Nocken und Gegennocken, sondern auch noch aufgrund des gegenseitigen Eingriffes der Nocken der beiden Schnecken.At the extension 21 with the bores 11 and 12 are radially inside protruding counter cams 23, 24 attached. They too are both in the axial direction the bores as well as in the circumferential direction of the same with gaps 25 and 26 between arranged like the spines of a porcupine fish. The height H of the counter cams in the embodiment shown corresponds approximately to the height H1 of the cams. The planes in which the cams 17 are arranged, are aligned with the also at right angles to the Approaches extending planes in which the cams 18 are arranged. Consequently come the cams 17 each in the area of the shortest mutual distance Screws 1, 2 in engagement with the cams 18. So the cams of the one mesh Snail with the cams of the other snail. The plastic mass will as a result not kept in separate strands, but also intimately mixed and plasticized. The mixing does not only take place between the cams and Counter-cams, but also because of the mutual engagement of the cams of the two snails.

Die erläuterte Ausführungsform der Erfindung basiert auf dem Grundgedanken, die Nocken 17 am Ansatz 7 einer ersten Schnekke 1 im Bereich der kürzesten Entfernung derselben von der zweiten Schnecke 2 bzw. deren Ansatz 8 in den Flugkreis dieser zweiten Schnecke 2 bzw. deren Ansatz 8 und die Nocken 18 am Ansatz 8 der zweiten Schnecke 2 in den Flugkreis der ersten Schnecke 1 bzw. deren Ansatz 7 einragen zu lassen. Dieser Grundgedanke kann nun so verwirklicht werden, daß die Nocken der einen Schnecke in beliebiger Weise in den Flugkreis der anderen Schnecke einragen. Er kann selbstverständlich auch in der an Hand der Zeichnung erläuterten Weise verwirklicht werden. Auch ist es möglich, die Nocken der einen Schnecke in Längsrichtung versetzt von den Nocken der anderen Schnecke anzuordnen, so daß ein kämmender Eingriff der Nocken nicht eintritt.The illustrated embodiment of the invention is based on the basic idea the cams 17 on the extension 7 of a first screw 1 in the region of the shortest distance the same from the second screw 2 or its approach 8 in the flight circle of this second Screw 2 or its extension 8 and the cams 18 on the extension 8 of the second screw 2 to protrude into the flight circle of the first screw 1 or its extension 7. This basic idea can now be implemented in such a way that the cams of one worm protrude in any way in the flight circle of the other snail. Of course he can can also be implemented in the manner explained with reference to the drawing. Also is it is possible to have the cams of one worm offset in the longitudinal direction from the cams to arrange the other worm, so that a meshing engagement of the cams does not entry.

Claims (4)

Ansprüche Doppelschneckenextruder mit an die Meteringzone in Richtung zur Düse anschließendem Mischer in Form von Nocken an den Schnecken und Gegennocken am Zylinder, gekennzeichnet durch die Ausbildung derart, daß die Nocken (17) an der ersten Schnecke (1) im Bereich der kürzesten Entfernung derselben (1) von der zweiten Schnecke (2) in den Flugkreis der zweiten Schnecke (2) und deren Nocken (18) in den Flugkreis der ersten Schnecke ragen. Claims twin screw extruder with towards the metering zone mixer connected to the nozzle in the form of cams on the screws and counter cams on the cylinder, characterized by the design such that the cams (17) on the first screw (1) in the area of the shortest distance of the same (1) from the second worm (2) in the flight circle of the second worm (2) and its cams (18) protrude into the flight circle of the first snail. 2. Doppelschneckenextruder nach Anspruch 1, dadurch gekennzeichnet, daß die Nocken (17,18) in Längsrichtung der Schnecken (1,2) versetzt zueinander angeordnet sind.2. Twin screw extruder according to claim 1, characterized in that that the cams (17,18) offset from one another in the longitudinal direction of the screws (1,2) are arranged. 3. Doppelschneckenextruder nach Anspruch 1, dadurch gekennzeichnet, daß die Nocken (17) der einen Schnecke (1) in kämmendem Eingriff mit den Nocken (18) der anderen Schnekke (2) stehen.3. Twin screw extruder according to claim 1, characterized in that that the cams (17) of one worm (1) in meshing engagement with the cams (18) of the other screw (2). 4. Doppelschneckenextruder nach einem oder mehreren der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Bohrungen (11,12) im Schneckenzylinder im Bereich der Nokken (17,18) an deren Grund den gleichen Durchmesser aufweisen wie die Bohrungen in der Meteringzone (6).4. Twin screw extruder according to one or more of the preceding Claims, characterized in that the bores (11, 12) in the screw cylinder in the area of the cams (17, 18) have the same diameter at their base like the holes in the metering zone (6).
DE19772744583 1977-10-04 1977-10-04 Twin-screw extruder with intermeshing mixing cams at metering section - to achieve complete compounding and avoid inhomogeneities of plastics melt Ceased DE2744583A1 (en)

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DE19772744583 DE2744583A1 (en) 1977-10-04 1977-10-04 Twin-screw extruder with intermeshing mixing cams at metering section - to achieve complete compounding and avoid inhomogeneities of plastics melt

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DE19772744583 DE2744583A1 (en) 1977-10-04 1977-10-04 Twin-screw extruder with intermeshing mixing cams at metering section - to achieve complete compounding and avoid inhomogeneities of plastics melt

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911834A1 (en) * 1978-04-03 1979-10-04 Cincinnati Milacron Austria DOUBLE SCREW EXTRUDER
EP0039957A2 (en) * 1980-05-14 1981-11-18 Bühler AG Extrusion process
EP0346757A2 (en) * 1988-06-15 1989-12-20 Krauss-Maffei Aktiengesellschaft Twin screw extruder
EP1247454A1 (en) * 2000-11-13 2002-10-09 MORINAGA & CO., LTD. Kneading device and forming device

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US3169752A (en) * 1960-08-22 1965-02-16 Plastus S A Sa Homogenizing device for extruding or injecting machines in the treatment of thermoplastics
DE7103071U (en) * 1971-10-07 Barmag Barmer Maschinenfabrik Ag Screw extruder for thermoplastics with at least two interacting screws with mixing cams
DE2311946A1 (en) * 1973-03-07 1974-09-19 Siemens Ag Screw press for crosslinkable olefin polymers - with rows of studs on screw in mixing zone
DE2340499B1 (en) * 1973-08-10 1975-01-02 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal Multi-part screw for a screw extrusion press for processing plastics

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7103071U (en) * 1971-10-07 Barmag Barmer Maschinenfabrik Ag Screw extruder for thermoplastics with at least two interacting screws with mixing cams
US3169752A (en) * 1960-08-22 1965-02-16 Plastus S A Sa Homogenizing device for extruding or injecting machines in the treatment of thermoplastics
DE2311946A1 (en) * 1973-03-07 1974-09-19 Siemens Ag Screw press for crosslinkable olefin polymers - with rows of studs on screw in mixing zone
DE2340499B1 (en) * 1973-08-10 1975-01-02 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal Multi-part screw for a screw extrusion press for processing plastics

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2911834A1 (en) * 1978-04-03 1979-10-04 Cincinnati Milacron Austria DOUBLE SCREW EXTRUDER
EP0039957A2 (en) * 1980-05-14 1981-11-18 Bühler AG Extrusion process
EP0039957A3 (en) * 1980-05-14 1982-09-15 Gebruder Buhler Ag Extrusion process and extrusion apparatus for realizing this process
EP0346757A2 (en) * 1988-06-15 1989-12-20 Krauss-Maffei Aktiengesellschaft Twin screw extruder
EP0346757A3 (en) * 1988-06-15 1991-02-06 Krauss-Maffei Aktiengesellschaft Twin screw extruder
US5000900A (en) * 1988-06-15 1991-03-19 Krauss-Maffei A.G. Twin screw extruder
EP1247454A1 (en) * 2000-11-13 2002-10-09 MORINAGA & CO., LTD. Kneading device and forming device
EP1247454A4 (en) * 2000-11-13 2007-01-10 Morinaga & Co Kneading device and forming device

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