DE2650248C2 - Screw extruder for processing plasticizable plastics - Google Patents

Screw extruder for processing plasticizable plastics

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Publication number
DE2650248C2
DE2650248C2 DE2650248A DE2650248A DE2650248C2 DE 2650248 C2 DE2650248 C2 DE 2650248C2 DE 2650248 A DE2650248 A DE 2650248A DE 2650248 A DE2650248 A DE 2650248A DE 2650248 C2 DE2650248 C2 DE 2650248C2
Authority
DE
Germany
Prior art keywords
lugs
screw extruder
screw
mixer shaft
mixer
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.)
Expired
Application number
DE2650248A
Other languages
German (de)
Other versions
DE2650248A1 (en
Inventor
Heinz Dipl.-Ing. 8640 Kronach Weber
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE2650248A priority Critical patent/DE2650248C2/en
Publication of DE2650248A1 publication Critical patent/DE2650248A1/en
Application granted granted Critical
Publication of DE2650248C2 publication Critical patent/DE2650248C2/en
Expired 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
    • B29C48/68—Barrels or cylinders
    • 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
    • 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
    • B29C48/395—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
    • B29C48/41—Intermeshing counter-rotating 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
    • B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • 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
    • B29C48/565—Screws having projections other than the thread, e.g. pins
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

Die Erfindung betrifft einen Schneckenextruder zur Verarbeitung plastifizierbarer Kunststoffe mit mindestens einer in einem Schneckengehäuse drehbaren Schnecke, die an ihrem freien Ende eine Mischerwelle mit einer Mehrzahl radial nach außen gerichteter Nasen oder Nocken trägt, die mit mindestens annähernd gleichmäßigen Winkelabständen voneinander jeweils kreisförmig um die Mischerwelle herum angeordnet sind.The invention relates to a screw extruder for processing plasticizable plastics with at least a screw rotatable in a screw housing, which has a mixer shaft at its free end with a plurality of radially outwardly directed lugs or cams, which with at least approximately Equal angular distances from one another in each case arranged in a circle around the mixer shaft are.

An Schneckenextrudern weist das plastifizierte Extrudat zuweilen erhebliche Unterschiede im Grad der Plastifizierung auf. Dies zeigt sich beispielsweise in Unebenheiten der Innenfläche von extrudierten Rohren. Außerdem können die Festigkeitswerte der extrudierten Produkte auf Grund der ungleichmäßigen Plastifizierung sehr verschieden sein.On screw extruders, the plasticized extrudate sometimes shows considerable differences in the degree of Plasticizing on. This can be seen, for example, in the unevenness of the inner surface of extruded pipes. In addition, the strength values of the extruded products can decrease due to the uneven plasticization be very different.

Bei einem aus der US-PS 36 76 034 bekannten Schneckenextruder der eingangs genannten Art weist die Schnecke zn ihrem freien Ende und auch bereits zwischen den Gängen jeweils radial gerichtete Stifte auf, während der Schneckenzylinder selbst gl?tt ist. Im Betrieb wird die platifizierte Masse in axialer Richtung durch die am freien Schneckenende angeordneten Stifte gedrückt, so daß die Masse in einzelne axiale Strähnen zerteilt wird, die sich hinter den Stiften wieder miteinander vereinigen. Da die thermoplastische Masse dabei als Ganzes rotiert, ist der durch die Stifte hervorgerufene Mischeffekt sehr gering.In a screw extruder of the type mentioned at the beginning known from US Pat. No. 3,676,034 , the screw has radially directed pins at its free end and also already between the flights, while the screw cylinder itself is smoothed. During operation, the platified mass is pressed in the axial direction through the pins arranged at the free end of the screw, so that the mass is divided into individual axial strands which unite with one another behind the pins. Since the thermoplastic mass rotates as a whole, the mixing effect caused by the pins is very low.

Aus der DEAS ! 2 45 584 ist ferner ein Schneckenextruder bekannt, dessen Schnecke an ihrem vorderen Ende ringförmige Rippen aufweist, die durch schraubenförmig gerichtete und in Umfangsrichtunj gegeneinander versetzte Schlitze unterbrochen sind. In dem ringförmigen Zwischenraum zwischen je zwei Ringrippci und in Fortsetzung der Schlitze ragen jeweils Messer, die in der Gehäusewand radial verstellbar angeordnet sind. Diese Messer haben weniger eine Mischwirkung als eine Förderwirkung, indem mit den Messern die Menge beeinflußt werden kann, die aus dem Ringraum zwischen zwei Ringrippen an den in Förderrichtung benachbarten Ringraum abgegeben werden kann. Die Durchmischung des Materials wird durch diese Vorrichtung nur in unwesentlichem Maße beeinflußt. DarüberFrom the DEAS! 2 45 584 is also a screw extruder known, the screw has at its front end annular ribs, which by helically directed and mutually offset in circumferential direction slots are interrupted. In the ring-shaped Between each two ring ribs and in continuation of the slots knives protrude, which are arranged radially adjustable in the housing wall. These knives have less of a mixing effect as a conveying effect, in that the knives can be used to influence the amount that comes out of the annulus can be delivered between two annular ribs to the annular space adjacent in the conveying direction. the Mixing of the material is only influenced to an insignificant extent by this device. About that

ίο hinaus stauen die Ringrippen das Material, so daß nur ein relativ geringer Durchsatz durch diesen Schneckenextruder möglich ist.ίο the ring ribs stow the material so that only a relatively low throughput is possible through this screw extruder.

Der Erfindung liegt die Aufgabe zugrunde, bei einem Schneckenextruder der eingangs genannten Art mit einfachen Mitteln eine wirksame Feinplastifizierung und Durchmischung des Materials unmittelbar vor dem Eintritt der plastifizierten Masse in das Spritzwerkzeug zu erreichen.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daO der die Mischerwelle umgebende Gehäuseabschnitt eine Vielzahl von radial nach innen ragenden Gegennasen trägt, die mit Umfangsabständen voneinander kreisförmig und gegenüber den Nasen der Mischerwelle axial derart versetzt angeordnet sind, daß beim Betrieb des Extruders die Nasen der Mischerwelle zwischen den Gegennasen des Gehäuseabschnittes hindurrhtreten.The invention is based on the object of using simple means to achieve an effective fine plasticization and thorough mixing of the material immediately before the plasticized mass enters the injection molding tool in a screw extruder of the type mentioned at the beginning.
This object is achieved according to the invention in that the housing section surrounding the mixer shaft bears a plurality of radially inwardly projecting counter lugs which are circularly spaced from one another and are axially offset from the lugs of the mixer shaft in such a way that, when the extruder is in operation, the lugs of the mixer shaft between step back against the noses of the housing section.

Bei der °rfindungsgemäßen Ausführungsform wird die im wesentlichen axial vorgeschobene Masse durch die Gegennasen an der Gehäuseinnenwand in einzelneIn the embodiment according to the invention, the essentially axially advanced mass is passed through the counter lugs on the inside wall of the housing in individual

jo axiale Strähnen unterteilt. Diese werden nun ihrerseits durch die zwischen den Gegennasen hindurchtrctcnden Nasen der Mischerwelle zerhackt, wobei jeweils ein Teil einer Strähne in die in Umfangsrichtung benachbarte Strähne verschoben wird. Auf diese Weise wird sichergestellt, daß sich die unterteilten Strähnen nicht wieder in unveränderter Form vereinigen können, wie das bei den oben'beschriebenen Ausführungsformen nach dem Stand der Technik der Fall ist. Mit der erfindungsgemäßen Vorrichtung wird eine zuverlässige Durchmischung des Materials sichergestellt. Gleichzeitig wird durch die Scherwirkung auf Grund der relativ engen Spalte zwischen den Nasen und den Gegennasen eine weitere Plastifizierung des Materials erreicht. Es hat sich in der Praxis gezeigt, daß die Wirkung dieser Mischvorrichtung das Resultat aller bisher bekannten Mischvorrich-. tungen erheblich übersteigt.jo axial strands divided. These will now be your turn chopped up by the noses of the mixer shaft penetrating between the counter noses, with one part each one strand is shifted into the circumferentially adjacent strand. This ensures that that the divided strands cannot unite again in the same way as in the above-described embodiments according to the prior art is the case. With the invention Device ensures reliable mixing of the material. At the same time, the Shear action due to the relatively narrow gap between the noses and the opposing noses causes further plasticization of the material. It has been shown in practice that the effect of this mixing device the result of all previously known mixing devices. significantly exceeds.

Anspruch 2 beinhaltet eine vorteilhafte erfindungsgemäße Ausführungsform eines Doppelschneckenextruders. Claim 2 contains an advantageous embodiment according to the invention of a twin-screw extruder.

Die folgende Beschreibung erläutert in Verbindung mit der Zeichnung die Erfindung anhand zweier Ausführungsbeispiele. Es zeigtThe following description explains the invention in conjunction with the drawing on the basis of two exemplary embodiments. It shows

Fig. 1 einen Einschneckenextruder mit Mischer zwischen der Schnecke und der Düse, schematisch,Fig. 1 shows a single screw extruder with a mixer between the screw and the nozzle, schematically,

F i g. 2 den Mischer bei dem Extruder nach F i g. 1 mit nachgeschalteter Düse und vorgeschalteter Schnecke, vergrößert, im Längsschnitt,
F i g. 3 einen Schnitt entlang der Linie A-A in F i g. 2, F i g. 4 den Mibcherteil an einem Doppelschneckenex-F i g. 2 the mixer in the extruder according to FIG. 1 with downstream nozzle and upstream screw, enlarged, in longitudinal section,
F i g. 3 shows a section along the line AA in FIG. 2, fig. 4 the Mibch part on a twin screw extrusion

bo truder, im Längsschnitt.bo truder, in longitudinal section.

Bei dem Einschneckenextruder nach Fig. 1 ist die antreibbare Schnecke 1 innerhalb des rohrzylindrischen Gehäuses 2 drehbeweglich eingebaut. Von dem Eidfülltrichter 3 kommend, gelangt das Granulat in die Ein-In the single-screw extruder according to FIG. 1, the drivable screw 1 is inside the tubular cylinder Housing 2 installed rotatably. Coming from the oath filling funnel 3, the granules enter the

t>5 zugszone I. Von hier aus wird der Kunststoff in die Umwandlungszone Il und anschließend in die Auss'.oß- oder Meteringzone 111 gefördert. Bei den bisher gebräuchlichen Extrudern schließt an die Meteringzonet> 5 tensile zone I. From here the plastic is fed into the Conversion zone II and then promoted to the Auss'.oß- or metering zone 111. With the previously used Extruding is connected to the metering zone

III der Spritzkopf, also das Werkzeug mit der Düse an.III the spray head, i.e. the tool with the nozzle.

In Abänderung der bekannten Maschine ist gemäßIn modification of the known machine is according to

der Erfindung zwischen dem Werkzeug 4 mit der Düse 5of the invention between the tool 4 with the nozzle 5

, und der Schnecke 1 ein Mischer 6 eingebaut. Bei dem, and the screw 1 has a mixer 6 installed. In which

gezeigten Ausführungsbeispiel besteht der Mischer aus einer Welle 7 mit vorspringenden Nasen 8 und einem ; ; Gehäuseabschnitt 9 mit Gegennasen 10, die mit denThe mixer shown consists of a shaft 7 with protruding lugs 8 and a ; ; Housing section 9 with counter lugs 10, which with the

■ , Nasen 8 zusammenwirken. Die Welle 7 ist fest mit der■, lugs 8 cooperate. The shaft 7 is fixed to the

Schnecke 1 verbunden und führt infolgedessen auch de-Connected screw 1 and consequently also leads

' : ren Drehbewegung aus.': ren rotary motion.

Bei der Ausführung nach F i g. 1 bzw. F i g. 2 sind die j Nasen 8 entlang des Umfanges der Welle 7 in fünf Reihen angeordnet. Auch die Gegennasen 10 sind reihenweise entlang des Innenmantels des Gehäuseabschnittes 9 vorgesehen. Im Längsschnitt (Fig.2) ragen die Nasen 8 in Lücken im Gehäuseabschnitt 9 ein. wogegen die Gegennasen 10 in Lücken zwischen den Nasen 8 sich / einsetzen. Der Gehäuseabschnitt 9 des Mischers 6 stelltIn the embodiment according to FIG. 1 and FIG. 2 are the j lugs 8 along the circumference of the shaft 7 in five rows arranged. The opposing lugs 10 are also in rows along the inner jacket of the housing section 9 provided. In the longitudinal section (Fig. 2) protrude Lugs 8 in gaps in the housing section 9. whereas the opposing lugs 10 are located in gaps between the lugs 8 / insert. The housing section 9 of the mixer 6 represents

sich im übrigen gleichsam als Verlängerung des Extrudergehäuses 2 dar. In Abweichung vom dargestellten Ausführungsbeispiel kann die Zahl der Reihen beliebig gewählt werden. Auch braucht die Reihenzahl an der Welle 7 und am Gehäuseabschnitt 9 nicht übereinstimmen. otherwise, as it were, as an extension of the extruder housing 2. In contrast to the illustrated embodiment, the number of rows can be as desired to get voted. The number of rows on the shaft 7 and on the housing section 9 also need not match.

Bei dem Extrudernach Fig. 1 gelangt der plastifizierte Kunststoffstrom aus der Meteringzone III in den nach Art eines Rührwerkmischers wirksamen Mischer 6, um hier innig durchmischt und zusätzlich feinstplastifiziert zu werden. Vom Mischer 6 aus gelangt der feinstplastifizierte Kunststoffstrom schließlich zum Werk- jo zeug 4 und in die Düse 5.In the extruder according to Fig. 1, the plasticized Plastic flow from metering zone III into the mixer, which works like an agitator mixer 6, in order to be thoroughly mixed here and also finely plasticized. The finely plasticized comes from the mixer 6 Plastic flow finally to the tool 4 and into the nozzle 5.

< Bei Doppelschneckenextrudern (Fig.4) schließt an jede Schnecke 11, 12 im Extrudergehäuse 13 eine fest mit ihnen verbundene Mischerwelle 14, 15 mit Nasen oder Nocken 16, 17 an. die mit Gegennasen 18, 19 im J5 Gehäuseabschnitt 20 zusammenwirken. Nach dem Austritt aus den beiden Mischerbereichen wird das Material zweckmäßigerweise durch ein Hosenstück 21 zu einem ; einzigen String zusammengeführt und dem nicht ge- | zeigten Werkzeug zugeleitet.<In the case of twin-screw extruders (FIG. 4), each screw 11, 12 in the extruder housing 13 is connected to a mixer shaft 14, 15 with lugs or cams 16, 17 that is firmly connected to it. which cooperate with counter lugs 18, 19 in the J5 housing section 20. After exiting the two mixer areas, the material is expediently transformed into one by a trouser piece 21 ; merged a single string and not matched | showed tool forwarded.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (2)

Patentansprüche:Patent claims: 1. Schneckenextruder zur Verarbeitung piastifizierbarer Kunststoffe mit mindestens einer in einem Schneckengehäuse drehbaren Schnecke, die an ihrem freien Ende eine Mischerwelle mit einer Mehrzahl radial nach außen gerichteter Nasen oder Nokken trägt, die mit mindestens annähernd gleichmäßigen Winkelabständen voneinander jeweils kreisförmig um die Mischerwelle herumangeordnet sind, dadurch gekennzeichnet, daß der die Mischerweüe (14 bzw. 15) umgebende Gehäuseabschnitt (9; 20) eine Vielzahl von radial nach innen ragenden Gegennasen (10; 18,19) trägt, die mit Umfangsabständen voneinander kreisförmig und gegenüber den Nasen (8; 16, 17) der Mischerwelle axial derart versetzt angeordnet sind, daß beim Betrieb des Extruders die Nasen (8; 16,17) der Mischerweile zwischen den Gegennasen (10; 18, 19) des Gehäuseabschnittes (9; 20) hindurchtreten.1. Screw extruder for processing plasticizable Plastics with at least one screw rotatable in a screw housing, which is attached to its free end of a mixer shaft with a plurality of radially outwardly directed noses or cams carries, which are circular with at least approximately uniform angular distances from each other are arranged around the mixer shaft, characterized in that the mixer shaft (14 or 15) surrounding housing section (9; 20) a plurality of radially inward protruding counter noses (10; 18,19), with circumferential distances circular from one another and axially opposite the lugs (8; 16, 17) of the mixer shaft are arranged offset in such a way that the lugs (8; 16,17) of the mixing shaft during operation of the extruder pass between the counter noses (10; 18, 19) of the housing section (9; 20). 2. Schneckenextruder nach Anspruch 1, dadurch gekennzeichnet, daß bei Ausbildung des Schneckenextruders als Doppelschneckenextruder beide Schnecken (U, 12) mit jeweils einer Mischerwelle (14,15) mit Nasen (16 bzw. 17) versehen sind und daß der die Mischerwelle umgebende Gehäuseabschnitt (20) zwei vollzylindrische, an ihrer jeweiligen Innenwand die Gegennasen (18, 19) tragende Kamiern ι aufweist.2. Screw extruder according to claim 1, characterized in that when the screw extruder is formed as a twin screw extruder, both screws (U, 12) each with a mixer shaft (14,15) are provided with lugs (16 or 17) and that the housing section surrounding the mixer shaft (20) two fully cylindrical chambers ι bearing the opposing lugs (18, 19) on their respective inner walls having.
DE2650248A 1976-11-02 1976-11-02 Screw extruder for processing plasticizable plastics Expired DE2650248C2 (en)

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DE2650248A DE2650248C2 (en) 1976-11-02 1976-11-02 Screw extruder for processing plasticizable plastics

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DE2650248A DE2650248C2 (en) 1976-11-02 1976-11-02 Screw extruder for processing plasticizable plastics

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DE2650248A1 DE2650248A1 (en) 1978-05-03
DE2650248C2 true DE2650248C2 (en) 1985-06-05

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Publication number Priority date Publication date Assignee Title
JPS57110429A (en) * 1980-12-27 1982-07-09 Ishikawajima Harima Heavy Ind Co Ltd Mixing and dispersing apparatus in molten resin extruder
DE3438649A1 (en) * 1984-10-22 1986-04-24 Windmöller & Hölscher, 4540 Lengerich SINGLE SCREW EXTRUSION FOR THERMOPLASTIC AND ELASTOMERS
CN107428104B (en) * 2014-12-30 2019-05-10 奥特克莱夫高压高温有限公司 Device for material deformation processing
DE102016122277A1 (en) 2016-11-18 2018-05-24 Troester Gmbh & Co. Kg Pin-extruder

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE851691C (en) * 1943-01-17 1952-10-06 Basf Ag Screw injection machine
NL268469A (en) * 1960-08-22 1900-01-01
US3676034A (en) * 1970-05-01 1972-07-11 American Can Co Extruder mixing screw
DE2340499C2 (en) * 1973-08-10 1980-02-14 Barmag Barmer Maschinenfabrik Ag, 5600 Wuppertal extrusion press

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