DE2748918A1 - Compact drive for extruder with conical twin screws - has worm-gear normal to axial plane of screws, to allow operating at low rotational speed - Google Patents

Compact drive for extruder with conical twin screws - has worm-gear normal to axial plane of screws, to allow operating at low rotational speed

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Publication number
DE2748918A1
DE2748918A1 DE19772748918 DE2748918A DE2748918A1 DE 2748918 A1 DE2748918 A1 DE 2748918A1 DE 19772748918 DE19772748918 DE 19772748918 DE 2748918 A DE2748918 A DE 2748918A DE 2748918 A1 DE2748918 A1 DE 2748918A1
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Germany
Prior art keywords
screws
worm
extruder
gear
conical
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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
DE19772748918
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German (de)
Other versions
DE2748918C2 (en
Inventor
Heinz Dipl Ing Weber
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Individual
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Individual
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Priority to DE2748918A priority Critical patent/DE2748918C2/en
Publication of DE2748918A1 publication Critical patent/DE2748918A1/en
Application granted granted Critical
Publication of DE2748918C2 publication Critical patent/DE2748918C2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B30B11/241—Drive means therefor; screw bearings
    • 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
    • B29B7/484—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 two shafts provided with screws, e.g. one screw being shorter than the other
    • 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
    • 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
    • B29B7/489—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
    • B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
    • 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
    • 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
    • B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
    • B29C48/525—Conical 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
    • B29C48/03—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

Landscapes

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

Abstract

Twin screw extruder has conical screws, with the drive installed between the screws and the source of rotary force. The drive is a worm gearing with the wormgear perpendicular to the plane of the axes of the extruder screws, driven by the source of rotary force and driving the wormwheels of the extruder screws. Device has relatively simple construction, taking up little space. Enables the screw axes which, in conical twin screw extruders cross each other, to be driven at low rates of rotation.

Description

"Doppelschneckenextruder mit konischen "Twin screw extruder with conical

Extruderschnecken" Bei Doppelschneckenextrudern mit konischen Extruderschnecken wird üblicherweise eine der Extruderschneckenwellen von einem Untersetzungsgetriebe aus angetrieben, welches seine Drehkraft von der Drehkraftquelle erhält. Die vom Untersetzungsgetriebe aus angetriebene Extruderschneckenwelle ist dabei mit einem Kegelzahnrad versehen, welches ein Gegenkegelzahnrad antreibt, das auf der unteren Eitruderschneckenwelle angeordnet ist. Extruder screws "For twin screw extruders with conical extruder screws is usually one of the extruder screw shafts from a reduction gear powered off, which gets its torque from the torque source. The ones from Reduction gear from driven extruder worm shaft is here with a Provided bevel gear, which drives a counter bevel gear on the lower Eitruder worm shaft is arranged.

Nachteilig ist bei der bekannten Ausbildung des Antriebes, daß der bauliche Aufwand verhältnismäßig hoch ist und daß relativ viel Platz zur Unterbringung dieser Getriebeanordnung notwendig ist. Der Kegelzahnradtrieb, der die unter einem Winkel stehende zweite Extruderschneckenwelle antreibt, wuß die geforderte Leistung bei den niedrigen Drehzahlen der Extruderschneckenwellen übertragen. Das hat entsprechend hohe Zahndrücke zur Folge. Für die eingesetzten Kegelzahnräder steht aber nur ein beschränkter Einbauraum zur Verfügung, woraus sich auch eine dementsprechend beschränkte Drehmomentübertragung ergibt. Hinzu kommt, daß zur Erzeugung der niedrigen Drehzahlen ein eigenes Untersetzungsgetriebe nötig ist. Dabei sind mehrere Getriebe stufen üblich.The disadvantage of the known design of the drive is that the structural effort is relatively high and that a relatively large amount of space for accommodation this gear arrangement is necessary. The bevel gear drive, which is the under one Angular second extruder screw drives, knew the required performance at the low speeds of the extruder screw shafts. That has accordingly result in high tooth pressures. Stands for the bevel gears used but only a limited installation space is available, which accordingly results in one limited torque transmission results. In addition to that, to generate the low Speeds a separate reduction gear is necessary. There are several transmissions levels common.

Die Lösung des Problems, bei konischen Doppelschneckenextrudern die zwei sich kreuzenden Achsen mit gegenläufigen, niedringen Drehzahlen anzutreiben, erfordert somit nach dem Stand der Technik zwei voneinander verschiedene, hintereinander geschaltet Baugruppen, nialich ein Untersetzungsgetriebe und einen Winkeltrieb.The solution to the problem with conical twin screw extruders to drive two intersecting axes at low speeds in opposite directions, thus requires two different, one after the other, according to the prior art switched assemblies, nialich a reduction gear and an angle drive.

Der Erfindung liegt die Aufgabe zugrunde, das gleiche Problem mit relativ wenigen Ble--nt-n in einem einzigen Schritt zu lösen. Demgemäß besteht die Erfindung an einem Doppelschneckenextruder mit konischen Extruderschnecken und zwischen diesen und der Drehkraftquelle eingebautem Getriebe darin, daß das Getriebe als Schneckengetriebe ausgebildet ist, dessen Schnekke, die senkrecht auf der Ebene der Achsen der konischen Extruderschnecken steht, von der Drehkraftquelle angetrieben wird und auf je ein Schneckenrad der konischen Extruderschnekken treibt.The invention is based on the task of having the same problem relatively few Ble-nt-n can be solved in a single step. Accordingly, the Invention on a twin screw extruder with conical extruder screws and between these and the rotary power source built-in gearbox in that the gearbox as Worm gear is formed whose worm, which is perpendicular to the plane the axes of the conical extruder screws is driven by the source of rotation and drives one worm gear each of the conical extruder screws.

Bei der erfindungsgemäßen Ausbildung ist zum einen die Vinkelstellung der angetriebenen Achsen frei wahlbar, zum anderen ermöglichen die eingesetzten Schneckentriebe wegen ihrer Eigenagt einen großen Untersetzungssprung in Richtung auf die verfahrenstechnisch geforderten niedrigen Drehzahlen.In the embodiment according to the invention, on the one hand there is the angular position of the driven axes freely selectable, on the other hand the used Worm drives because of their Eigenagt a large step-down in the direction on the process-technically required low speeds.

Die Schneckenräder können unmittelbar auf den zugehörigen Extruderschneckenwellen befestigt sein. In vielen Fällen wird es sich jedoch empfehlen, zwischen den Schneckenrädern und den Eitruderschneckenwellen noch jeweils eine Getriebestufe mit zylindrischen Zahnrädern anzuordnen. Pfeilverzahnungen und ähnliche Maßnahmen zur Erhöhung der Kraftübertragung sind dabei möglich. Hierdurch ist man frei in der Wahl eines entsprechend starken Schneckentriebes, und die Übersetzung kann so gewählt werden, daß der Schneckentrieb im Bereich des günstigsten Wirkungsgrades liegt. Dabei ist es keinesfalls notwendig, daß die Achsen der Schneckenräder in derselben Ebene liegen wie die Achsen der angetriebenen Zahnräder.The worm gears can be placed directly on the associated extruder worm shafts be attached. In many cases, however, it is recommended to be between the worm gears and the Eitruder worm shafts each have a gear stage to be arranged with cylindrical gears. Herringbone gears and similar measures to increase the power transmission are possible. This means you are free in the choice of a correspondingly strong worm drive, and the translation can be like that be chosen that the worm drive in the range of the most favorable efficiency lies. It is by no means necessary for the axes of the worm gears to be in lie on the same plane as the axes of the driven gears.

Die Erfindung ist nachstehend anhand der Zeichnung erläutert, die ein Ausführungsbeispiel und eine Abwandlung des Antriebes veranschaulicht. Es zeigen: Fig. 1 einen Doppelschneckenextruder mit unmittelbare. Schneckenantrieb, schematisch, im Längsschnitt, Fig. 2 eine Ausführung des Schneckentriebes mit einer nachgeschalteten Zahnradstufe mit xylindris chen Zahnrädern.The invention is explained below with reference to the drawing, which illustrates an embodiment and a modification of the drive. Show it: Fig. 1 shows a twin screw extruder with immediate. Worm drive, schematic, in longitudinal section, Fig. 2 shows an embodiment of the worm drive with a downstream Gear stage with xylindric gears.

Der Doppelschneckenextruder 1 umfaßt im wesentlichen den Zylinder 2 mit den konischen Eitruderschnecken 3 und 4.The twin screw extruder 1 essentially comprises the barrel 2 with the conical egg-row augers 3 and 4.

Der Einfülltrichter1 der in der gewählten Schnittdarstellung nicht sichtbar ist, wird durch die gestrichelte Kreislinie, die mit 5 bezeichnet wurde, angedeutet.The hopper1 in the selected sectional view is not is visible, is indicated by the dashed circle line, which was marked with 5, indicated.

Die Wellen 6 und 7 der konischen Eitruderschnecken 3 und 4 weisen am freien Ende je ein Schneckenrad 8 und 9 auf. Beide Schneckenräder stehen in Eingriff mit der Schnecke 10. Diese erhält ihren Antrieb über einen nichtgezeigten Elektromotor.The shafts 6 and 7 of the conical Eitruder screws 3 and 4 have a worm wheel 8 and 9 each at the free end. Both worm gears are in mesh with the screw 10. This receives its drive via an electric motor, not shown.

Die Achse der Schnecke 10 steht senkrecht auf einer durch das Zentrum beider Extruderschnecken 3 und 4 gelegten Ebene.The axis of the screw 10 is perpendicular to one through the center both extruder screws 3 and 4 laid level.

Damit die Rückdruckkräfte von den konischen Extruderschnecken 3 und 4 nicht an den Schneckentrieb gelangen, sind die Wellen 6 und 7 mittels der Axiallager 11 und 12 am Getriebegehäuse 13 abgestützt.So that the back pressure forces from the conical extruder screws 3 and 4 do not get to the worm drive, the shafts 6 and 7 are by means of the axial bearings 11 and 12 are supported on the gear housing 13.

Bei solcher Ausbildung des Antriebes der konischen Extruderschnecken kann mit einer einzigen Untersetzungsstufe ein äusserst hoher Untersetzungssprung erreicht werden, wobei der Raumbedarf des Gesamtgetriebes äußerst niedrig liegt und sich der zusätzliche Vorteil bietet, daß die Winkelstellung der Extruderschnecken frei wählbar ist.With such a design of the drive of the conical extruder screws can achieve an extremely high reduction step with a single reduction stage can be achieved, the space requirement of the entire transmission is extremely low and there is the additional advantage that the angular position of the extruder screws is freely selectable.

In vielen Fällen kann es zur Erzielung des optimalen Wirkungsgrades des Schneckentriebes günstig sein, die Ausbildung gemäß Fig. 2 zu treffen, wonach zwischen den Schneckenrädern 14 und 15 und den Schneckenwellen 16 und 17 jeweils eine Getriebe beradstufe 18 und 19 angeordnet ist. Bei der Ausführung nach Fig. 2 wird jede Getrieberadstufe mittels zweier zylindrischer Stirnzahnräder 20, 21 bzw. 22, 23 gebildet. Die Schnekke ist in Fig. 2 mit 24 bezeichnet.In many cases it can be used to achieve optimal efficiency of the worm drive be favorable to meet the training of FIG. 2, after which between the worm gears 14 and 15 and the worm shafts 16 and 17, respectively a gear wheel stage 18 and 19 is arranged. In the embodiment according to Fig. 2, each gear wheel stage is provided by means of two cylindrical spur gears 20, 21 and 22, 23 respectively. The screw is designated by 24 in FIG. 2.

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Claims (3)

Ansprttche 1. Doppelschneckenextruder mit konischen Extruderschnecken und zwischen diesen und der Drehkraftquelle eingebautem Getriebe, dadurch gekennzeichnet, daß das Getriebe als Schneckengetriebe ausgebildet ist, dessen Schnecke, die senkrecht auf der Ebene der Achsen der konischen Extruderschnecken steht, von der Drehkraftquell. angetrieben wird und auf je ein Schneckenrad (8,9;14,15) der konischen Extruderschnecken (3,4) treibt. Claim 1. Twin screw extruder with conical extruder screws and between these and the rotary power source built-in gear, characterized in, that the gear is designed as a worm gear, the worm of which is perpendicular stands at the level of the axes of the conical extruder screws, from the source of torque. is driven and on a worm wheel (8,9; 14,15) of the conical extruder screws (3,4) drives. 2. Doppeischneckeneitruder nach Anspruch 1, dadurch gekenn zeichnet, daß die Schneckenräder (8,9) unmittelbar auf den zugehörigen Schneckenwellen (6,7) befestigt sind. 2. twin-screw rudder according to claim 1, characterized in that that the worm wheels (8,9) directly on the associated worm shafts (6,7) are attached. 3. Doppelschneckenextruder nach Anspruch 1, dadurch gekenn zeichnet, daß zwischen den Schneckenrädern (14,15) und den Schneckenwellen (16,17) noch jeweils eine Getrieberadstufe (18,19) angeordnet ist. 3. Twin screw extruder according to claim 1, characterized in that that between the worm wheels (14,15) and the worm shafts (16,17) still each a gear stage (18,19) is arranged.
DE2748918A 1977-11-02 1977-11-02 Twin screw extruder with intermeshing conical extruder screws Expired DE2748918C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2748918A DE2748918C2 (en) 1977-11-02 1977-11-02 Twin screw extruder with intermeshing conical extruder screws

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2748918A DE2748918C2 (en) 1977-11-02 1977-11-02 Twin screw extruder with intermeshing conical extruder screws

Publications (2)

Publication Number Publication Date
DE2748918A1 true DE2748918A1 (en) 1979-05-03
DE2748918C2 DE2748918C2 (en) 1986-10-30

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3420918A1 (en) * 1984-06-05 1985-12-05 Johannes Dr. 8640 Kronach Weber Twin-screw extruder
US5232280A (en) * 1990-08-22 1993-08-03 Masao Moriyama Twin conical screw extruder provided with pressurizing members
EP0598376A1 (en) * 1992-11-16 1994-05-25 Kabushiki Kaisha Kobe Seiko Sho Cone type twin screw extruder
EP0658414A1 (en) * 1993-12-17 1995-06-21 The Gates Rubber Company Twin screw extruder and torque splitting transmission
NL9401105A (en) * 1994-07-01 1996-02-01 Laurentius Gerardus Johannes W Transmission
DE29703158U1 (en) * 1997-02-22 1997-05-22 Rehau Ag + Co, 95111 Rehau Twin screw extruder
US5836681A (en) * 1995-11-21 1998-11-17 Pomini S.P.A. Machine with two converging threaded rotors for the extrusion of plastomers elastomers and the like
US6234661B1 (en) * 1998-12-08 2001-05-22 A. Friedr. Flender Ag Transmission for a double screw extruder with two tapering helical shafts
DE102004012569A1 (en) * 2004-03-12 2005-09-29 A. Friedr. Flender Ag Gearbox for a twin-screw extruder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466934A (en) * 1946-01-05 1949-04-12 Charles E Dellenbarger Extruding machine for plastic material
DE803325C (en) * 1948-10-02 1951-04-02 Karl Moritz Dipl Ing Screw press
US3281899A (en) * 1963-01-28 1966-11-01 Dacco Ernesto Injection molding apparatus with plural reciprocating screws
CH444470A (en) * 1965-09-21 1967-09-30 Ekma Entwicklungs Und Maschine Process for extruding and extruders for carrying out the process
US3416189A (en) * 1967-03-10 1968-12-17 Benjamin P. Welt Shaft seal for extruders of heat-sensitive plastics and like materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466934A (en) * 1946-01-05 1949-04-12 Charles E Dellenbarger Extruding machine for plastic material
DE803325C (en) * 1948-10-02 1951-04-02 Karl Moritz Dipl Ing Screw press
US3281899A (en) * 1963-01-28 1966-11-01 Dacco Ernesto Injection molding apparatus with plural reciprocating screws
CH444470A (en) * 1965-09-21 1967-09-30 Ekma Entwicklungs Und Maschine Process for extruding and extruders for carrying out the process
US3416189A (en) * 1967-03-10 1968-12-17 Benjamin P. Welt Shaft seal for extruders of heat-sensitive plastics and like materials

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3420918A1 (en) * 1984-06-05 1985-12-05 Johannes Dr. 8640 Kronach Weber Twin-screw extruder
DE3420918C2 (en) * 1984-06-05 1987-04-02 Johannes Dr. 8640 Kronach De Weber
US5232280A (en) * 1990-08-22 1993-08-03 Masao Moriyama Twin conical screw extruder provided with pressurizing members
EP0598376A1 (en) * 1992-11-16 1994-05-25 Kabushiki Kaisha Kobe Seiko Sho Cone type twin screw extruder
US5415473A (en) * 1992-11-16 1995-05-16 Kabushiki Kaisha Kobe Seiko Sho Cone type twin screw extruder having gear reduction system
AU675737B2 (en) * 1993-12-17 1997-02-13 Gates Rubber Company, The Twin screw extruder and torque splitting transmission
US5483852A (en) * 1993-12-17 1996-01-16 The Gates Rubber Company Twin screw extruder and torque splitting transmission
EP0658414A1 (en) * 1993-12-17 1995-06-21 The Gates Rubber Company Twin screw extruder and torque splitting transmission
NL9401105A (en) * 1994-07-01 1996-02-01 Laurentius Gerardus Johannes W Transmission
US5836681A (en) * 1995-11-21 1998-11-17 Pomini S.P.A. Machine with two converging threaded rotors for the extrusion of plastomers elastomers and the like
DE29703158U1 (en) * 1997-02-22 1997-05-22 Rehau Ag + Co, 95111 Rehau Twin screw extruder
EP0860269A2 (en) * 1997-02-22 1998-08-26 REHAU AG + Co Twin screw extruder
EP0860269A3 (en) * 1997-02-22 1999-02-17 REHAU AG + Co Twin screw extruder
US6234661B1 (en) * 1998-12-08 2001-05-22 A. Friedr. Flender Ag Transmission for a double screw extruder with two tapering helical shafts
DE102004012569A1 (en) * 2004-03-12 2005-09-29 A. Friedr. Flender Ag Gearbox for a twin-screw extruder
US7185559B2 (en) 2004-03-12 2007-03-06 A. Friedr. Flender Aktiengesellschaft Gear mechanism for twin screw extruder

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