DE1168631B - Device for processing thermoplastic plastics on screw presses and kneaders - Google Patents

Device for processing thermoplastic plastics on screw presses and kneaders

Info

Publication number
DE1168631B
DE1168631B DEB50155A DEB0050155A DE1168631B DE 1168631 B DE1168631 B DE 1168631B DE B50155 A DEB50155 A DE B50155A DE B0050155 A DEB0050155 A DE B0050155A DE 1168631 B DE1168631 B DE 1168631B
Authority
DE
Germany
Prior art keywords
chamber
shaft
shaft journal
discharge nozzle
kneaders
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
Application number
DEB50155A
Other languages
German (de)
Inventor
Dr Fritz Hanusch
August Rettig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to DEB50155A priority Critical patent/DE1168631B/en
Priority to CH7573259A priority patent/CH370916A/en
Priority to GB29065/60A priority patent/GB930828A/en
Priority to US52660A priority patent/US3047907A/en
Publication of DE1168631B publication Critical patent/DE1168631B/en
Priority to DEB77583A priority patent/DE1279313B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29B7/52—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices with rollers or the like, e.g. calenders
    • B29B7/523—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices with rollers or the like, e.g. calenders co-operating with casings
    • 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
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • 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
    • B29C48/50—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
    • 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
    • B29C48/76—Venting, drying means; Degassing 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
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in 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
    • B29C48/03—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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY

DEUTSCHESGERMAN

PATENTAMTPATENT OFFICE

AUSLEGESCHRIFTEDITORIAL

Internat. KL: B29fBoarding school KL: B29f

Nummer:
Aktenzeichen:
Anmeldetag:
Auslegetag:Number:
File number:
Registration date:
Display day:

Deutsche Kl.: 39 a4- 3/04 German class: 39 a4- 3/04

1168 631
B 50155 X/39 a4
29. August 1958
23. April 19641168 631
B 50155 X / 39 a4
August 29, 1958
April 23, 1964

Thermoplastische Kunststoffe werden auf Schneckenpressen und Ko-Knetern zu Strängen, Bändern, Rohren und ähnlichen langgestreckten Formgebilden verarbeitet, wobei entweder die Formgebung oder das Herstellen einer homogenen Mischung aus Kunststoffen und Zusatzstoffen oder auch aus verschiedenen Kunststoffen das Ziel der Verarbeitung sein kann. Sofern man nur auf die Mischwirkung abzielt, wird im allgemeinen von einer Konfektionierung der Kunststoffe gesprochen. Hierbei werden die Stränge oder Bänder nach dem Auspressen und Abkühlen meist zu Schnitzeln oder Körnern zerschlagen und in dieser Form der endgültigen Verarbeitung zugeführt.Thermoplastics are used on screw presses and co-kneaders into strands, tapes, tubes and similar elongated shapes processed, whereby either the shaping or the production of a homogeneous mixture of plastics and additives or from different plastics can be the goal of processing can. If one is aiming only at the mixing effect, in general one of the Plastics spoken. Here, the strands or tapes are pressed out and cooled mostly broken up into chips or grains and fed to the final processing in this form.

Es sind in diesem Zusammenhang bereits Extrudiervorrichtungen bekannt, bei denen an das Austrittsende des Massezylinders eine mit einer Austragsdüse versehene Kammer gleichachsig angesetzt ist. In dieser Kammer dreht sich ein mit der Knetoder Förderschnecke gleichachsig verbundener, zylindrisch oder kegelig ausgeführter Wellenzapfen ohne zusätzliche axiale Bewegungen. Vor dem Massezylinder solcher Vorrichtungen ist somit eine separate Reib- und Mischkammer mit einem ringförmigen Arbeitsraum konstanter Spaltabmessungen gegeben, aus der die aufbereitete Masse etwa senkrecht zur Schneckenwelle lediglich unter dem Einfluß des im Massezylinder aufgebauten Förderdruckes austritt.In this context, extrusion devices are already known in which at the outlet end A chamber provided with a discharge nozzle is attached coaxially to the mass cylinder is. In this chamber a cylinder rotates coaxially connected to the kneading or conveyor screw or tapered shaft journal without additional axial movements. In front of the mass cylinder such devices is thus a separate friction and mixing chamber with an annular Working space of constant gap dimensions given, from which the processed mass is approximately perpendicular to the The worm shaft only emerges under the influence of the delivery pressure built up in the mass cylinder.

Es sind ferner bereits Walzwerke zur Behandlung von thermoplastischen Stoffen bekannt, die einen eigenen Antrieb besitzen, also mit einer anderen Vorrichtung zur Behandlung solcher Stoffe nicht unmittelbar verbunden werden. Diese Vorrichtungen bestehen aus einem prismatischen Arbeitsraum, in dem entweder eine oder zwei Walzen unter Bildung von spaltförmigen Einzugszonen für den zu behandelnden Stoff drehbar gelagert sind. In der Ausführungsform mit nur einer Walze ist diese exzentrisch in einem zylindrischen Gehäuse gelagert, wobei der Einzugsspalt zwischen der Walze und der feststehenden Gehäusewand entsteht. In der Ausführungsform mit zwei Walzen wird der Einzugsspalt zwischen beiden sich gegenläufig drehenden Walzen bei sonst gleichen Abständen von den feststehenden Gehäuseflächen gebildet. In beiden Fällen führen die Walzen in ihrem Arbeitsraum außer der Rotationsbewegung keine zusätzliche hin- und hergehende axiale Bewegung aus.There are also already rolling mills for the treatment of thermoplastic materials are known own drive, so not directly with another device for treating such substances get connected. These devices consist of a prismatic workspace, in either one or two rollers with the formation of gap-shaped feed zones for the to be treated Fabric are rotatably mounted. In the embodiment with only one roller, this is eccentric stored in a cylindrical housing, the nip between the roller and the stationary Housing wall is created. In the embodiment with two rollers, the nip is between the two counter-rotating rollers with otherwise equal distances from the fixed housing surfaces educated. In both cases, the rollers lead in their work space in addition to the rotational movement no additional reciprocating axial movement.

Die Erfindung betrifft demgegenüber eine Vorrichtung zum Verarbeiten von thermoplastischen Kunststoffen auf Schneckenpressen und Ko-Knetern sowie zum gleichmäßigen Austragen des plastifizierten Kunststoffes aus solchen Maschinen, die aus einer Vorrichtung zum Verarbeiten von thermoplastischen Kunststoffen auf Schneckenpressen
und Ko-KneternIn contrast, the invention relates to a device for processing thermoplastics on screw presses and co-kneaders and for evenly discharging the plasticized plastic from machines that consist of a device for processing thermoplastics on screw presses
and kneaders

Anmelder:Applicant:

Badische Anilin- & Soda-FabrikAniline & Soda Factory in Baden

Aktiengesellschaft, Ludwigshafen/RheinAktiengesellschaft, Ludwigshafen / Rhein

Als Erfinder benannt:Named as inventor:

Dr. Fritz Hämisch,Dr. Fritz Haemisch,

August Rettig, Ludwigshafen/RheinAugust Rettig, Ludwigshafen / Rhine

an das Austrittsende des die Förderschnecke bzw. Knetwelle umgebenden Massezylinders angeschlossenen Kammer besteht, wobei in diese Kammer ein mit der Schneckenwelle bzw. mit der in axialer Richtung vor- und zurückbewegbaren Knetwelle koaxial verbundener Wellenzapfen hineinragt. In der Kammer sollen, bedingt durch eine nicht gleichachsige Lage der bewegten und festen Scherflächen, zusätzliche, vom Förderdruck des Massezylinders unabhängige Druckänderungen und Förderwirkungen eintreten. Dies wird erfindungsgemäß dadurch erreicht, daß der innere Durchmesser der den Arbeitsraum des Wellenzapfens bildenden und die Austragsdüse in der Mantelfläche enthaltenden Kammer größer ist als der innere Durchmesser des Massezylinders und daß diese Kammer exzentrisch an den Massezylinder angesetzt ist.connected to the outlet end of the mass cylinder surrounding the screw conveyor or kneading shaft Chamber consists, in this chamber one with the worm shaft or with the in the axial direction protruding forward and backward movable kneading shaft coaxially connected shaft journal. In the chamber should, due to a non-coaxial position of the moving and fixed shear surfaces, additional, Pressure changes and conveying effects that are independent of the delivery pressure of the mass cylinder occur. This is achieved according to the invention in that the inner diameter of the working space of the shaft journal forming and containing the discharge nozzle in the outer surface chamber is larger than the inner diameter of the mass cylinder and that this chamber is eccentric to the mass cylinder is set.

Nach einem weiteren Merkmal der Erfindung ist die durch die exzentrische Lage der Kammer gegenüber dem Wellenzapfen gebildete Engstelle mit Bezug auf die Dreh- und Förderrichtung des Wellenzapfens unmittelbar hinter der Austragsdüse angeordnet.According to a further feature of the invention is due to the eccentric position of the chamber opposite Bottleneck formed on the shaft journal with reference to the direction of rotation and conveyance of the shaft journal arranged directly behind the discharge nozzle.

Die Wirkungsweise der Vorrichtung sei im Zusammenhang mit der Zeichnung erläutert, in der Fig. 1 einen Querschnitt und Fig. 2 einen Längsschnitt durch einen erfindungsgemäß ausgebildeten Spritzkopf zeigt.The operation of the device will be explained in connection with the drawing in which 1 shows a cross section and FIG. 2 shows a longitudinal section shows by a spray head designed according to the invention.

An den Zylinder 1 eines Ko-Kneters ist eine im Durchmesser größere Kammer 2 gesetzt, und zwar exzentrisch zum Zylinder 1. Die Knetwelle 3 wird um den Wellenzapfen 4 verlängert. Auf diese Weise entsteht eine Art Gleitlager mit extrem großer Lagerluft. Der Drehsinn der Knetwelle ist durch einen Pfeil markiert. Infolge der exzentrischen Lage der Kammer zum Zylinder bzw. zur Knetwelle bildet sich im Bereich des Keilspalts eine Einzugszone 5. DieOn the cylinder 1 of a kneader a larger diameter chamber 2 is set, namely eccentric to cylinder 1. The kneading shaft 3 is extended by the shaft journal 4. In this way a kind of slide bearing is created with an extremely large internal clearance. The direction of rotation of the kneading shaft is through a Arrow marked. As a result of the eccentric position of the chamber in relation to the cylinder or the kneading shaft in the area of the wedge gap a feed zone 5. The

' 409 560/418'409 560/418

Austragsdüse 6 wird senkrecht zur Förderrichtung in die Druckzone gelegt. Hierdurch bleibt die Hin- und Herbewegung der Knetwelle ohne Einfluß auf den Fluß des thermoplastischen Materials in der Düse, so daß Stränge mit stets gleichem Querschnitt aus der Düse austreten.Discharge nozzle 6 is placed in the pressure zone perpendicular to the conveying direction. This leaves the back and reciprocating the kneading shaft without affecting the flow of the thermoplastic material in the Nozzle, so that strands with always the same cross-section emerge from the nozzle.

Die Vorrichtung kann ferner mit Vorteil bei Schneckenpressen oder auch Ko-Knetern verwandt werden, um aus dem thermoplastischen Kunststoff leichtflüchtige Bestandteile, z. B. Wasser oder niedermolekulare Anteile, zu entfernen. Da die Oberfläche des Kunststoffs in der Kammer infolge der Walzbewegung ständig erneuert wird und da sich gleichzeitig hinter dem engsten Spaltquerschnitt eine drucklose Zone 7 bildet, können Wasser, Monomere und andere flüchtige Bestandteile leicht verdampfen. Hierzu bringt man eine weitere Öffnung 8 in der Kammerwand in der Hälfte der Kammer an, die dem engsten Spaltquerschnitt gegenüberliegt, und verbindet sie zweckmäßigerweise mit einer Absaugvorrichtung, um den Gasdruck in dieser Kammerhälfte zu erniedrigen.The device can also be used with advantage in screw presses or co-kneaders are to remove volatile components from the thermoplastic such. B. water or low molecular weight Shares, to remove. Because the surface of the plastic in the chamber as a result of the rolling motion is constantly renewed and at the same time there is a pressureless one behind the narrowest gap cross-section Zone 7 forms, water, monomers and other volatile components can easily evaporate. For this purpose, a further opening 8 is made in the chamber wall in half of the chamber, which is the the narrowest gap cross-section, and conveniently connects it to a suction device, to lower the gas pressure in this half of the chamber.

Claims (3)

Patentansprüche:Patent claims: 1. Vorrichtung zum Verarbeiten von thermoplastischen Kunststoffen auf Schneckenpressen und Ko-Knetern sowie zum gleichmäßigen Austragen des plastifizierten Kunststoffes aus solchen Maschinen, bestehend aus einer an das Austrittsende des die Förderschnecke bzw. Knetwelle umgebenden Massezylinders angeschlossenen, in ihrer Wandung die Austragsdüse enthaltenden Kammer, in die ein mit der Schneckenwelle bzw. mit der in axialer Richtung vor- und zurückbewegbaren Knetwelle koaxial verbundener Wellenzapfen hineinragt, dadurch gekennzeichnet, daß der innere Durchmesser der den Arbeitsraum des Wellenzapfens (4) bildenden und die Austragsdüse (6) in der Mantelfläche enthaltenden Kammer (2) größer ist als der innere Durchmesser des Massezylinders (1) und daß diese Kammer (2) exzentrisch an den Massezylinder (1) angesetzt ist.1. Device for processing thermoplastics on screw presses and co-kneaders as well as for the uniform discharge of the plasticized plastic from such Machines consisting of one attached to the exit end of the screw conveyor or kneading shaft surrounding mass cylinder connected, containing the discharge nozzle in its wall Chamber into which one can move back and forth in the axial direction with the worm shaft or with the Kneading shaft projecting coaxially connected shaft journal, characterized in that that the inner diameter of the working space of the shaft journal (4) and the discharge nozzle (6) in the outer surface containing chamber (2) is larger than the inner diameter of the mass cylinder (1) and that this chamber (2) is attached eccentrically to the mass cylinder (1). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die durch die exzentrische Lage der Kammer (2) gegenüber dem Wellenzapfen (4) gebildete Engstelle mit Bezug auf die Dreh- und Förderrichtung des Wellenzapfens unmittelbar hinter der Austragsdüse (6) angeordnet ist.2. Apparatus according to claim 1, characterized in that the through the eccentric Position of the chamber (2) opposite the shaft journal (4) formed bottleneck with reference to the The direction of rotation and conveyance of the shaft journal is arranged directly behind the discharge nozzle (6) is. 3. Vorrichtung nach Anspruch 1 oder 2, gekennzeichnet durch eine Öffnung (8) in jenem freien Raum der Kammer (2), der der Einzugszone (5) zwischen Wellenzapfen (4) und Kammerwand etwa gegenüberliegt.3. Apparatus according to claim 1 or 2, characterized by an opening (8) in that Free space of the chamber (2), that of the feed zone (5) between the shaft journal (4) and the chamber wall about opposite. In Betracht gezogene Druckschriften:
Schweizerische Patentschrift Nr. 317 570;
USA.-Patentschriften Nr. 2 645 813, 2 780 834.Considered publications:
Swiss Patent No. 317 570;
U.S. Patent Nos. 2,645,813, 2,780,834. Hierzu 1 Blatt Zeichnungen1 sheet of drawings 409 560/418 4. 64409 560/418 4. 64 ι Bundesdruckerei Berlinι Bundesdruckerei Berlin
DEB50155A 1958-08-29 1958-08-29 Device for processing thermoplastic plastics on screw presses and kneaders Pending DE1168631B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DEB50155A DE1168631B (en) 1958-08-29 1958-08-29 Device for processing thermoplastic plastics on screw presses and kneaders
CH7573259A CH370916A (en) 1958-08-29 1959-07-14 Device for processing thermoplastics on a screw press or a kneader
GB29065/60A GB930828A (en) 1958-08-29 1960-08-23 Improvements in processing thermoplastic synthetic materials in mixing and kneading machines
US52660A US3047907A (en) 1958-08-29 1960-08-29 Apparatus for processing thermoplastic synthetic materials in screw extruders and ko-kneaders
DEB77583A DE1279313B (en) 1958-08-29 1964-07-08 Device for processing thermoplastics on screw presses and kneaders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB50155A DE1168631B (en) 1958-08-29 1958-08-29 Device for processing thermoplastic plastics on screw presses and kneaders

Publications (1)

Publication Number Publication Date
DE1168631B true DE1168631B (en) 1964-04-23

Family

ID=6969098

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB50155A Pending DE1168631B (en) 1958-08-29 1958-08-29 Device for processing thermoplastic plastics on screw presses and kneaders

Country Status (1)

Country Link
DE (1) DE1168631B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645813A (en) * 1950-06-29 1953-07-21 Union Carbide & Carbon Corp Process and apparatus for continuous milling of plastic material
CH317570A (en) * 1952-10-02 1956-11-30 Pasquetti Carlo Press for mixing and extruding plastic materials
US2780834A (en) * 1955-10-06 1957-02-12 Du Pont Extruder equipped with a mulling head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2645813A (en) * 1950-06-29 1953-07-21 Union Carbide & Carbon Corp Process and apparatus for continuous milling of plastic material
CH317570A (en) * 1952-10-02 1956-11-30 Pasquetti Carlo Press for mixing and extruding plastic materials
US2780834A (en) * 1955-10-06 1957-02-12 Du Pont Extruder equipped with a mulling head

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