CH444470A - Process for extruding and extruders for carrying out the process - Google Patents

Process for extruding and extruders for carrying out the process

Info

Publication number
CH444470A
CH444470A CH1302865A CH1302865A CH444470A CH 444470 A CH444470 A CH 444470A CH 1302865 A CH1302865 A CH 1302865A CH 1302865 A CH1302865 A CH 1302865A CH 444470 A CH444470 A CH 444470A
Authority
CH
Switzerland
Prior art keywords
screws
extruder
extruded
constant
screw
Prior art date
Application number
CH1302865A
Other languages
German (de)
Inventor
Anger Anton
Original Assignee
Ekma Entwicklungs Und Maschine
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 Ekma Entwicklungs Und Maschine filed Critical Ekma Entwicklungs Und Maschine
Priority to CH1302865A priority Critical patent/CH444470A/en
Publication of CH444470A publication Critical patent/CH444470A/en

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
    • B29C48/252—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
    • 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
    • B29C48/36—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
    • 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)

Description

  

  
 



  Verfahren zum Extrudieren und Extruder zur Durchführung des Verfahrens
Die   vorliegende    Erfindung betrifft ein Verfahren zum Extrudieren von   Kunststoffen    sowie einen Extruder mit mindestens zwei nach der   Ausstossseite    hlin konisch zusammenlaufenden Schnecken.



   Das erfindungsgemässe Verfahren zeichnet sich dadurch aus, dass man dem zu extrudierenden Material im Extruder pro Zeiteinheit und   Mengeneinheit    eine vom Materialeinlauf zum Ausstoss im Extruder hin abnehmende Wärmemenge zuführt oder entzieht.



   Der Extruder zur Durchführung dieses Verfahrens ist   dadurch    gekennzeichnet, dass sowohl das Gehäuse als auch die Schnecken   heiz- und    kühlbar sind.



   Die Erfindung wird anschliessend beispielsweise anhand einer Figur erläutert, welche in schematischer Darstellung den Gehäuseunterteil eines Extruders mit eingelegten konischen Schnecken und Antriebsteilen zeigt.



   In einem Gehäuse 1 eines Extruders sind zur Lagerung zweier Schnecken-Antriebswellen je drei Querlager 3, 5, 6 bzw. 9, 11 und 12 angeordnet sowie je ein   Axialpendelrollenlager    7 bzw. 13. Eine Antriebswelle 15 trägt ein   Kegeiritzel    17 während eine   dlaneben-    liegende   Antriebswelle    19 mit einem mit dem Ritzel 17 kämmenden Kegelritzel 21 versehen ist. Die Antriebswelle   19    wird über einen Keilriementrieb 25 und eine Riemenscheibe 23 von einem Antriebsmotor 27 angetrieben. Die Antriebswellen 15 und 19 und die Kegelnaben 37 und 39 der beiden Förderschnecken 33 und 35 sind über Kupplungen 29 und 31   mibeinander    verbunden.

   Auf den   Kegelnaben    37 und 39 sind Schnekken 41 und 43 angeordnet, welche im dargestellten Beispiel konstante Steigung aufweisen. Die Förderschnecken 33 und 35 stecken in einer konischen Ge  häuseansuehmung    45, welche derart bemessen ist, dass sie mit den Schnecken 33 und 35 pro Ganghöhe am Schneckenanfang Kompartimente 47 und am Schnekkenende Kompartimente 49 festlegen, welche vorzugsweise gleich gross sind. Es sind mit andern Worten die konische Gehäuseausnehmung 45 und die   Förderschnek-    ken 33 und 35 so aufeinander abgestimmt, dass die Grösse der Kompartimente 47 und 49 gleich ist und deren Grösse auch sich längs der Förderschnecke 33   sbzw.    35 nicht ändert.



   In diesem Falle wird das zu extrudierende Material mit praktisch konstanter Geschwindigkeit längs den Schnecken 33 und 35 gefördert. Es ist   jedoch    auch möglich, diese Kompartimente verschieden gross zu gestalten und damit z. B. am Anfang des Extrudierens, d. h. am dicken Ende der Förderschnecken 33 und 35 eine verlangsamte Bewegung des Materials zu erreichen.



   Im Gehäuse 1, und zwar sowohl im   Ober- wie    im Unterteil, befinden sich   Kühigänge    51 und 53, wobei zur Unterteilung in eine Einzugszone, Knetzone, Pla  stifizierungs- und    Ausstosszone vorteilhafterweise eine Unterteilung in vier   Heiz- oder    Kühlzonen möglich ist.



  Diese   Kühl- oder    Heizgänge 51 und 53 im Gehäuse werden über Anschlussnippel 55 und 57 mit entsprechenden   Heiz-oder    Kühlmedien beaufschlagt.



   Auch die   Förderschnecken    33 und 35 sind mit analogen   Kühl- und    Heizgängen 59 und 61 versehen, wobei das   Kühl- oder    Heizmittel über Anschlussnippel 63 und 65 den Schnecken 33 und 35 zugeführt wird.



   Aufgrund der grössern Durchmesser der   Kegelkörper    37 und 39 an   den      dickeres    Ende   sind,    bei gleicher Steigung der Schnecken 41 und 43 über die ganze Länge der Förderschnecken 33 und 35, die   Berührungsflä-    chen der Kompartimente 47 der   Kegelkörper    37 und 39 grösser als der Kompartimente 49;

   denn bei gleicher axialer Breite b ist infolge des grösseren Radius   R1      der Umfang 2R1 7r am dickeren Ende der Kegelkörper    37 und 39 grösser als am Ausstossende mit dem Radius Rx und dem Umfang 2Rx   7G.    Es sind mit anderen Wor  ten die Wärmeübergangsflächen 2 z R1 b pro Gang-    höhe in der Einzugszone des Materials grösser (bei gleicher behandelter Produktmenge als in der Ausstoss  zone, wo sie 2 2aRx-b Rx b beträgt. Es erfolgt daher am    Anfang die grösste Wärmeabgabe an den zu verarbeitenden Rohstoff, was sehr wichtig und nützlich ist.



     Dadurch,    dass die konischen Schnecken 33 und 35 gegen die Ausstosszone hin sich   zusehends    verklei  nernde Wärmeübergangsflächen aufweisen, kann   zus am-    men mit der spezifischen   Heizzonenbelastung    das zu extrudierende Material nicht nur entsprechend seinen Materialeigenschaften, sondern auch bezüglich grössern Ausstossgeschwindigkeiten entsprechend   behandelt    werden. Auf diese Weise ist eine optimale Plastifizierung des zu verarbeitenden Stoffes möglich. Es können damit grosse   Ausstossgeschwindigkeitentbei      geringer    Extruderlänge erreicht werden.

   Zudem wird durch die konische Anordnung ein weiterer Vorteil dadurch geschaffen, dass der Antrieb infolge der grössern Achsdistanzen d als bei parallelen Schnecken   widerstandfähiger    ausgeführt werden kann, so dass die   bekannten    Zahnbrüche, welche bei parallelen   Doppelschnecken    sehr gefürchtet sind, bei dieser Konstruktion   vermieden    werden. Es ist damit auch möglich, alle   Raidal- und    Axiallager im Schneckenantrieb mit schweren Pendelrollenlagern,   die    im Ölbad laufen, auszulegen und' auf diese Weise   grundsätzlich    die gleiche Bauart, die sich bei   Einschneckenextrudern    bewährt hat, für Doppelschneckenextruder oder Mehrfachschneckenextruder zu verwenden.   



  
 



  Process for extruding and extruders for carrying out the process
The present invention relates to a method for extruding plastics and an extruder with at least two screws that conically converge on the discharge side.



   The process according to the invention is characterized in that the material to be extruded in the extruder is supplied with or withdrawn from the material to be extruded in the extruder per unit of time and unit of quantity from the material inlet to the outlet in the extruder.



   The extruder for carrying out this process is characterized in that both the housing and the screws can be heated and cooled.



   The invention will then be explained, for example, with reference to a figure which shows, in a schematic representation, the lower housing part of an extruder with inserted conical screws and drive parts.



   In a housing 1 of an extruder, three transverse bearings 3, 5, 6 or 9, 11 and 12 are arranged to support two screw drive shafts, as well as an axial spherical roller bearing 7 and 13, respectively. A drive shaft 15 carries a bevel pinion 17 while an adjacent one Drive shaft 19 is provided with a bevel pinion 21 meshing with pinion 17. The drive shaft 19 is driven by a drive motor 27 via a V-belt drive 25 and a belt pulley 23. The drive shafts 15 and 19 and the cone hubs 37 and 39 of the two screw conveyors 33 and 35 are connected to one another via couplings 29 and 31.

   On the conical hubs 37 and 39 worms 41 and 43 are arranged, which in the example shown have a constant pitch. The screw conveyors 33 and 35 are in a conical Ge häuseansuehmung 45, which is dimensioned such that they define with the screws 33 and 35 per pitch at the beginning of the screw compartments 47 and at the end of the screw compartments 49, which are preferably the same size. In other words, the conical housing recess 45 and the screw conveyors 33 and 35 are matched to one another in such a way that the size of the compartments 47 and 49 is the same and their size also extends along the screw conveyor 33 and 33, respectively. 35 does not change.



   In this case, the material to be extruded is conveyed along the screws 33 and 35 at a practically constant speed. However, it is also possible to make these compartments of different sizes and thus z. B. at the beginning of the extrusion, i.e. H. to achieve a slowed movement of the material at the thick end of the screw conveyors 33 and 35.



   In the housing 1, both in the upper and in the lower part, there are cooling aisles 51 and 53, whereby a subdivision into four heating or cooling zones is advantageously possible for the purpose of subdividing into a feed zone, kneading zone, pla stiffening and discharge zone.



  These cooling or heating passages 51 and 53 in the housing are acted upon by appropriate heating or cooling media via connection nipples 55 and 57.



   The screw conveyors 33 and 35 are also provided with analog cooling and heating passages 59 and 61, the cooling or heating medium being fed to the screws 33 and 35 via connection nipples 63 and 65.



   Due to the larger diameter of the cone bodies 37 and 39 at the thicker end, with the same pitch of the screws 41 and 43 over the entire length of the conveyor screws 33 and 35, the contact surfaces of the compartments 47 of the cone bodies 37 and 39 are larger than the compartments 49 ;

   because with the same axial width b, due to the larger radius R1, the circumference 2R1 7r at the thicker end of the cone bodies 37 and 39 is larger than at the discharge end with the radius Rx and the circumference 2Rx 7G. In other words, the heat transfer areas 2 z R1 b per aisle in the feed zone of the material are larger (with the same amount of product treated as in the discharge zone, where it is 2 2aRx-b Rx b. The largest is therefore at the beginning Heat transfer to the raw material to be processed, which is very important and useful.



     Because the conical screws 33 and 35 have increasingly smaller heat transfer surfaces towards the discharge zone, the material to be extruded can, together with the specific heating zone load, be treated not only according to its material properties but also with regard to higher discharge speeds. In this way, optimal plasticization of the material to be processed is possible. High output speeds can thus be achieved with a short extruder length.

   In addition, the conical arrangement creates a further advantage in that the drive can be made more resistant due to the larger axis distances d than with parallel screws, so that the known tooth breaks, which are very much feared with parallel twin screws, are avoided with this design. It is thus also possible to design all radial and axial bearings in the screw drive with heavy spherical roller bearings that run in an oil bath and in this way basically use the same design that has proven itself in single-screw extruders for twin-screw extruders or multiple-screw extruders.

Claims (1)

PATENTANSPRÜCHE I. Verfahren zum Extrudieren von Kunststoffen, dadurch gekennzeichnet, dass man dem zu extrudierenden Material im Extruder pro Zeiteinheit und Mengeneinheit eine vom Materialeinlauf zum Ausstoss im Extruder hin abnehmende Wärmemenge zuführt oder entzieht. PATENT CLAIMS I. A process for extruding plastics, characterized in that the material to be extruded in the extruder is supplied or withdrawn from the material to be extruded per unit of time and unit of quantity from the material inlet to the outlet in the extruder. II. Extruder mit mindestens zwei nach der Aus stossseite hin konisch zusammenlaufenden Schnecken zur Durchführung des Verfahrens nach Patentanspruch I, dadurch gekennzeichnet, dass sowohl das Gehäuse als auch die Schnecken heiz- und kühlbar sind. II. Extruder with at least two screws conically converging towards the discharge side for carrying out the method according to claim I, characterized in that both the housing and the screws can be heated and cooled. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass man das Gut längs der Schnecken in mindestens zwei; beispielsweise in vier Stufen tem peraturbehandelt. SUBCLAIMS 1. The method according to claim I, characterized in that the material along the screws in at least two; for example, temperature-treated in four stages. 2. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass man das Material erst in zwei Zonen erhitzt und anschliessend in zwei Zonen kühlt. 2. The method according to claim I, characterized in that the material is first heated in two zones and then cooled in two zones. 3. Extruder nach Patentanspruch II, dadurch gekennzeichnet, dass im Gehäuse und den Schnecken Durchgänge für, z. B. flüssige, Heiz- und Kühlmittel vorgesehen sind. 3. Extruder according to claim II, characterized in that in the housing and the screws passages for, for. B. liquid, heating and cooling means are provided. 4. Extruder nach Patentanspruch II, dadurch gekennzeichnet, dass die Schneckensteigung konstant und daher die Wärmeaustauschfläche pro Ganghöhe der Schnecken, oberfläche nach der Ausstossseite hin ab nimmt 5. Extruder nach Patentanspruch II, dadurch gekennzeichnet, dass das Schneckenfördervolumen pro Ganghöhe konstant ist, um die Bewegungsgeschwindigkeit der zu extrudierenden Masse in axialer Richtung konstant zu halten. 4. Extruder according to claim II, characterized in that the screw pitch is constant and therefore the heat exchange area per pitch of the screws decreases from the surface after the discharge side 5. Extruder according to claim II, characterized in that the screw delivery volume per pitch is constant in order to keep the movement speed of the mass to be extruded constant in the axial direction.
CH1302865A 1965-09-21 1965-09-21 Process for extruding and extruders for carrying out the process CH444470A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH1302865A CH444470A (en) 1965-09-21 1965-09-21 Process for extruding and extruders for carrying out the process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1302865A CH444470A (en) 1965-09-21 1965-09-21 Process for extruding and extruders for carrying out the process

Publications (1)

Publication Number Publication Date
CH444470A true CH444470A (en) 1967-09-30

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ID=4388653

Family Applications (1)

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CH1302865A CH444470A (en) 1965-09-21 1965-09-21 Process for extruding and extruders for carrying out the process

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748918A1 (en) * 1977-11-02 1979-05-03 Heinz Dipl Ing Weber Compact drive for extruder with conical twin screws - has worm-gear normal to axial plane of screws, to allow operating at low rotational speed
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
US5415473A (en) * 1992-11-16 1995-05-16 Kabushiki Kaisha Kobe Seiko Sho Cone type twin screw extruder having gear reduction system
EP0744269A2 (en) * 1995-05-24 1996-11-27 American Maplan Corp. Double-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
EP2179834A2 (en) 2008-10-21 2010-04-28 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Power transmission structure and two-shaft mixer/extruder

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748918A1 (en) * 1977-11-02 1979-05-03 Heinz Dipl Ing Weber Compact drive for extruder with conical twin screws - has worm-gear normal to axial plane of screws, to allow operating at low rotational speed
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
US5415473A (en) * 1992-11-16 1995-05-16 Kabushiki Kaisha Kobe Seiko Sho Cone type twin screw extruder having gear reduction system
EP0744269A2 (en) * 1995-05-24 1996-11-27 American Maplan Corp. Double-screw extruder
EP0744269A3 (en) * 1995-05-24 1997-09-10 American Maplan Corp Double-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
EP2179834A2 (en) 2008-10-21 2010-04-28 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Power transmission structure and two-shaft mixer/extruder
EP2179834A3 (en) * 2008-10-21 2013-04-24 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Power transmission structure and two-shaft mixer/extruder

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