DE3712749C1 - Use of a secondary extruder of a tandem system for cooling a plastic blowing agent mixture melt produced in a primary extruder - Google Patents

Use of a secondary extruder of a tandem system for cooling a plastic blowing agent mixture melt produced in a primary extruder

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Publication number
DE3712749C1
DE3712749C1 DE3712749A DE3712749A DE3712749C1 DE 3712749 C1 DE3712749 C1 DE 3712749C1 DE 3712749 A DE3712749 A DE 3712749A DE 3712749 A DE3712749 A DE 3712749A DE 3712749 C1 DE3712749 C1 DE 3712749C1
Authority
DE
Germany
Prior art keywords
extruder
cooling
blowing agent
central spindle
melt
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
DE3712749A
Other languages
German (de)
Inventor
Werner Dipl-Ing Mueller
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.)
KraussMaffei Extrusion GmbH
Original Assignee
Hermann Berstorff Maschinenbau GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6325666&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3712749(C1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hermann Berstorff Maschinenbau GmbH filed Critical Hermann Berstorff Maschinenbau GmbH
Priority to DE3712749A priority Critical patent/DE3712749C1/en
Priority to IT8820046A priority patent/IT1216670B/en
Priority to GB08808237A priority patent/GB2204524A/en
Priority to JP63091866A priority patent/JPS63278818A/en
Application granted granted Critical
Publication of DE3712749C1 publication Critical patent/DE3712749C1/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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29B7/485—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 three or more shafts provided with screws
    • 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
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • 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
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • 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
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/38—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in the same barrel
    • 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
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/385—Plasticisers, homogenisers or feeders comprising two or more stages using two or more serially arranged screws in separate barrels
    • 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
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • 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
    • B29C48/405—Intermeshing co-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
    • B29C48/395—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
    • B29C48/435—Sub-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
    • 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
    • B29C48/435—Sub-screws
    • B29C48/44—Planetary 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/834—Cooling
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/84—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders by heating or cooling the feeding screws
    • B29C48/85—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Landscapes

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

Abstract

A first extruder (A, Fig 1) produces a fused mass of a mixture of the plastics material and foaming propellant, and feeds it under pressure at inlet (3) into a second extruder (B) comprising a housing (4) having internal helical toothing (11). a central spindle (1) having external helical toothing, and a plurality of planetary spindles (2) having untoothed regions (13), between toothed regions (12) which mesh with both the housing and central spindle toothing, cooling means (15, 16, 17) being provided for cooling the mixture as it passes through the extrusion device (B) e.g. via a gear pump, to a discharge nozzle (21) for discharging the material as a tube. The pressure feed into the extruder (13) avoids foaming of the mixture during the enhanced cooling, effected in the extruder (B) by the toothed and untoothed regions (12, 13) which repeatedly roll the mixture into a thin film, and then reconstitute it. <IMAGE>

Description

Die Erfindung betrifft die Verwendung eines Sekundärextru­ ders, wie dargelegt im Patentanspruch.The invention relates to the use of a secondary extru otherwise, as set out in the claim.

Aus der DE-AS 11 35 652 ist eine Tandemanlage zum Her­ stellen einer Material-Treibmittelschmelze bekannt, die einen Primär­ extruder für den Aufschmelzvorgang des Polystyrols und für die Vermischung der Schmelze mit einem Treibmittel aufweist.From DE-AS 11 35 652 is a tandem system to Her announce a material blowing agent melt that is a primary extruder for the melting process of the polystyrene and for the Mixing the melt with a blowing agent.

Die Polystyrol-Treibmittelschmelze wird anschließend in einen Sekundärextruder gefördert, in dem eine Kühlung der Schmelze durchgeführt wird.The polystyrene blowing agent melt is then in one Secondary extruder promoted by cooling the melt is carried out.

Die Polystyrol-Treibmittelschmelze muß auf eine Temperatur un­ terhalb der kritischen Temperatur des normalerweise gasför­ migen Treibmittels heruntergekühlt und dann zu einem Folien­ schlauch extrudiert werden.The polystyrene blowing agent melt must be at a temperature un below the critical temperature of the normally gas coolant and then to a film hose can be extruded.

Der in dieser DE-AS gezeigte Sekundärextruder weist eine ge­ kühlte Welle mit paddelförmig darauf angeordneten Flügeln auf. The secondary extruder shown in this DE-AS has a ge cooled wave with paddle-shaped wings on it.  

Der Mantel des Sekundärextruders ist ebenfalls gekühlt.The jacket of the secondary extruder is also cooled.

Beim Einsatz eines derartigen Sekundärextruders hat sich ge­ zeigt, daß die Schmelze überwiegend zusammen mit der mittigen Welle und den Paddeln mitrotiert, ohne daß es zu nennenswer­ ten Schmelzeumschichtungen und somit nur zu einem geringen Kühleffekt kommt.When using such a secondary extruder has ge shows that the melt predominantly together with the middle The shaft and the paddles rotated without mentioning it melt layers and thus only to a small extent Cooling effect comes.

Als weiterer Nachteil muß die fehlende Förderleistung dieses Sekundärextruders angesehen werden.Another disadvantage is the lack of delivery capacity Secondary extruders.

Die Schmelze muß daher mittels des Primärextruders durch den Sekundärextruder und auch noch durch eine Blasdüse gepreßt werden. Der dafür erforderliche Förderdruck verursacht eine weitere Einleitung von Scherenergie in die Schmelze, was zu einer Temperaturerhöhung im Sekundärextruder führt.The melt must therefore by means of the primary extruder through the Secondary extruder and also pressed through a blow nozzle will. The required delivery pressure causes one further initiation of shear energy into the melt, leading to leads to a temperature increase in the secondary extruder.

Um diese Temperaturerhöhung durch eine verstärkte Kühlung zu kompensieren, ist viel Energie erforderlich. Kunststoff ist ein schlechter Wärmeleiter. Da der gezeigte Sekundärextruder von seiner Arbeitsweise her nur eine schlechte Kühlung ermöglicht und zudem noch Scherwärme in die Schmelze einleitet, muß, um eine vertretbare Kühlwirkung zu erzielen, viel Kühlfläche, d. h. ein sehr langer Extruder, eingesetzt werden. Je länger der Extruder wird, um so größer muß der Förderdruck des Pri­ märextruders sein, um den Sekundärextruder zu überfördern und um noch eine Schlauchfolie extrudieren zu können. Mit der Ver­ längerung steigt jedoch wiederum die Einleitung von Scherener­ gie in die Schmelze.To increase this temperature through increased cooling to compensate, a lot of energy is required. Is plastic a bad heat conductor. Because the secondary extruder shown only allows poor cooling due to its mode of operation and also introduces shear heat into the melt, in order to to achieve an acceptable cooling effect, a lot of cooling surface, d. H. a very long extruder. The longer the extruder becomes, the higher the delivery pressure of the Pri mary extruders to convey the secondary extruder and to be able to extrude a tubular film. With the Ver However, the initiation of Scherener increases pour into the melt.

Aus der DE-OS 33 16 838 ist eine Tandemanlage mit einem Sekundärextruder bekannt, der gekühlt wird und eine ähnliche Schnecke aufweist, wie beschrieben in der DE-AS 11 35 652. Die hinsichtlich der DE-AS 11 35 652 geschilderten Nachteile tref­ fen ebenfalls auf diese Anlage zu, weil die Kühlleistung die­ ses Sekundärextruders nur dann halbwegs zufriedenstellend ist, wenn der Extruder sehr lang ausgebildet ist und zusätzlich mit sehr geringer Drehzahl, d. h. mit geringem Ausstoß, gefahren wird.From DE-OS 33 16 838 is a tandem system known a secondary extruder that is cooled and a like Has snail, as described in DE-AS 11 35 652. Die regarding the disadvantages described DE-AS 11 35 652 tref also access this system because the cooling capacity  its secondary extruder is only reasonably satisfactory if the extruder is very long and also with very low speed, d. H. with low output, driven becomes.

Aus der DE-OS 27 19 095 ist ein Extruder mit um eine Zentralspindel herum angeordneten Planetspindeln bekannt, von denen auch teilweise die Schrägverzahnung entfernt ist.From DE-OS 27 19 095 is an extruder with one Central spindle arranged around planet spindles known, of which the helical toothing is also partially removed.

Aus dieser Schrift ist nicht bekannt, einen derartigen Extru­ der als Sekundärextruder für das Kühlen einer Polystyrol- Treibmittelschmelze einzusetzen, wobei die Kühlung unter Auf­ rechterhaltung eines hohen Polystyrol-Treibmitteldruckes ohne erneute Einleitung von Scherwärme erstellt werden muß.Such an extru is not known from this document which acts as a secondary extruder for cooling a polystyrene Use blowing agent melt, with the cooling under Auf maintaining a high polystyrene propellant pressure without reintroduction of shear heat must be created.

Bei der Verarbeitung einer Polystyrol-Treibmittelschmelze muß ein Herunterkühlen unterhalb der kritischen Temperatur des üblicherweise gasförmigen Treibmittels erreicht werden, bei gleichzeitiger Aufrechterhaltung des für die Extrusion eines Blasschlauches erforderlichen Werkzeugdruckes. Der Druck muß außerdem gehalten werden, um ein vorzeitiges Aufschäumen des Gemisches im Sekundärextruder und im Blaskopf zu vermeiden.When processing a polystyrene blowing agent melt cooling down below the critical temperature of the usually gaseous blowing agent can be achieved at while maintaining the extrusion for a Blow hose required tool pressure. The pressure must also be kept to prevent premature foaming of the Avoid mixtures in the secondary extruder and in the blow head.

Aus der DE-OS 29 05 717 ist ein kombinierter Extruder bekannt, der teilweise als üblicher Einschneckenextruder und teilweise als Planetwalzenextruder ausgebildet ist. Alle Schneckenteile, d. h. die Einschneckenteile und die jeweiligen Zentralspindeln der Planetwalzenextruderteile, sind drehfest miteinander ver­ bunden, so daß sich nur eine Drehzahl in dem kombinierten Ex­ truder verwirklichen läßt. Da eine aus Primär- und Sekundär­ extruder sich zusammensetzende Tandemanlage mit stark vonein­ ander abweichenden Drehzahlen betrieben werden muß, kann die­ ser Extruder nicht zum Kühlen einer Material-Treibmittelmi­ schung eingesetzt werden.A combined extruder is known from DE-OS 29 05 717, partly as a conventional single-screw extruder and partly is designed as a planetary roller extruder. All snail parts, d. H. the single-screw parts and the respective central spindles the planetary roller extruder parts are non-rotatably ver bound so that there is only one speed in the combined Ex truder can be realized. Because one of primary and secondary extruder composite tandem system with strong of each other must be operated at different speeds, the This extruder is not for cooling a material blowing agent mixture be used.

Es ist die Aufgabe der Erfindung, einen neuen Verwendungszweck eines Extruders einer Tandemanlage als Sekundärextruder aufzu­ zeigen, mit dem eine kontinuierliche intensive Kühlung bei gleichzeitiger Aufrechterhaltung eines hohen Material-Treib­ mittelgemischdruckes durchgeführt werden kann, ohne daß durch die Umschichtung der Mischung in nennenswerter Weise erneut Scherenergie, die sich als Wärme freisetzen würde, erzeugt wird.It is the object of the invention, a new purpose an extruder of a tandem system as a secondary extruder show with a continuous intensive cooling while maintaining a high material blowing rate medium mixture pressure can be carried out without the shifting of the mixture again in a noteworthy manner Shear energy that would be released as heat is generated becomes.

Die Aufgabe wird durch die Verwendung eines Sekundärextruders wie beschrieben im Patentanspruch gelöst.The task is accomplished through the use of a secondary extruder solved as described in the claim.

Durch die fast drucklose Förderung und ständige abrollende Um­ schichtung und Auswalzung der Schmelze in sehr dünne Schichten zwischen der gekühlten Zentralspindel, den Planetspindeln und der Schrägverzahnung des gekühlten Innenzylinders und auf­ grund der Schmelzeentspannung in den verzahnungsfreien Ab­ schnitten der Planetenspindeln, erfolgt eine hochwirkungsvolle Kühlung in einem sehr kurzen Bauteil.Thanks to the almost pressure-free delivery and constant rolling around Layering and rolling out the melt in very thin layers between the cooled central spindle, the planetary spindles and the helical teeth of the cooled inner cylinder and on due to the melt relaxation in the toothless Ab cut the planetary spindles, there is a highly effective Cooling in a very short component.

Ein Ausführungsbeispiel der Erfindung wird in den Zeichnungen gezeigt und nachfolgend beschrieben. Es zeigtAn embodiment of the invention is shown in the drawings shown and described below. It shows

Fig. 1 eine schematisierte Tandem-Extruderan­ lage für die Herstellung einer mit Treib­ mittel vermischten Polystyrolschmelze, Fig. 1 is a schematic tandem Extruderan location for the preparation of a, with blowing agent mixed polystyrene melt

Fig. 2 einen schematisierten Sekundärextruder im Detail, Fig. 2 is a schematic secondary extruder in detail,

Fig. 3 einen Querschnitt gemäß Linie III-III in Fig. 2. Fig. 3 shows a cross section according to line III-III in Fig. 2.

Die in Fig. 1 gezeigte Schaumpolystyrol-Tandemanlage besteht aus einem Primärextruder A und einem Sekundärextruder B.The foam polystyrene tandem system shown in Fig. 1 consists of a primary extruder A and a secondary extruder B.

Das aufzuschäumende, in Granulatform vorliegende Polystyrol wird in den Einfülltrichter 5 eindosiert und mittels der Ex­ truderschnecke 6 aufgeschmolzen. In dem Primärextruder A wird ein hoher Materialschmelzedruck bis zu 200 bar aufgebaut. Dann wird durch die Treibmitteleinspritzleitung 7 ein Treibmittel mit einem geringfügig höheren Druck als der Schmelzedruck in den Primärextruder injiziert und mit der Polystyrolschmelze gleichmäßig vermischt.The polystyrene to be foamed, in granular form, is metered into the hopper 5 and melted by means of the extruder screw 6 . A high material melt pressure of up to 200 bar is built up in the primary extruder A. Then, a blowing agent with a slightly higher pressure than the melt pressure is injected into the primary extruder through the blowing agent injection line 7 and mixed uniformly with the polystyrene melt.

Das Material-Treibmittelgemisch wird ohne merkliche Druckredu­ zierung weitergefördert. Eine Druckreduzierung würde bereits im Primärextruder zu einem Aufschäumvorgang führen.The material-blowing agent mixture is reduced without noticeable pressure adornment further promoted. A pressure reduction would already be cause foaming in the primary extruder.

Das Materialtreibmittelgemisch wird danach durch die Leitung 3 in den Sekundärextruder gefördert, in dem es heruntergekühlt werden muß, ohne daß ein bestimmter Druck in diesem Extruder unterschritten werden darf, um ein vorzeitiges Aufschäumen zu verhindern. Die Materialtemperatursenkung ist erforderlich, um zu vermeiden, daß beim Aufschäumen, d. h. beim Austritt der Schmelze aus dem Blaskopf die Zellwände des Schaumes zerplat­ zen.The material blowing agent mixture is then conveyed through line 3 into the secondary extruder, in which it must be cooled down without falling below a certain pressure in this extruder in order to prevent premature foaming. The lowering of the material temperature is necessary in order to prevent the cell walls of the foam from breaking up when foaming, ie when the melt emerges from the die.

Um einen Kühlvorgang durchzuführen, wird das Material in einen Sekundärextruder B eingegeben, der eine relativ kurze Baulän­ ge aufweist und dem ggf. ein normaler Schneckenabschnitt 8 vorgeschaltet ist.In order to carry out a cooling process, the material is fed into a secondary extruder B , which has a relatively short overall length and which may be preceded by a normal screw section 8 .

Es ist auch möglich, ohne einen vorgeschalteten Schneckenab­ schnitt 8 zu arbeiten. In einem solchen Fall würde die Mate­ rial-Treibmittelschmelze direkt in das Planetwalzenkühlteil 9 eingegeben. It is also possible to work without an upstream screw section 8 . In such a case, the material blowing agent melt would be input directly into the planetary roller cooling part 9 .

Das Planetwalzenkühlteil 9 besteht aus der Zentralspindel 1 und den Planetspindeln 2, die in einem mit einer schrägen Innenverzahnung 11 ausgebildeten Gehäuse 4 zusammenwirken.The planetary roller cooling part 9 consists of the central spindle 1 and the planetary spindles 2 , which cooperate in a housing 4 formed with oblique internal teeth 11 .

Da die Zentralspindel 1 einen runden Kühlkanal 15 für den Vor­ lauf und einen koaxialen Ringkühlkanal 16 für den Rücklauf des Kühlmediums aufweist, wird eine sehr effektive Kreislaufküh­ lung dieser Zentralspindel 1 erreicht. Das Gehäuse 4 weist zusätzlich umlaufende Kühlkanäle 17 auf, die an einen Kühlmediumeinlauf­ stutzen 18 und einen Auslaufstutzen 19 für einen kontinuier­ lichen Durchlauf angeschlossen sind.Since the central spindle 1 has a round cooling channel 15 for the run before and a coaxial ring cooling channel 16 for the return of the cooling medium, a very effective circulation cooling this central spindle 1 is achieved. The housing 4 also has circumferential cooling channels 17 which are connected to a cooling medium inlet 18 and an outlet 19 for a continuous flow.

Die Planetspindeln 2 weisen teilweise eine Schrägverzahnung 12 auf, die sich mit verzahnungsfreien Abschnitten 13 abwechseln, wie auch aus dem Querschnitt in Fig. 3 zu ersehen ist.The planetary spindles 2 partially have helical teeth 12 which alternate with toothless sections 13 , as can also be seen from the cross section in FIG. 3.

In Umlaufrichtung der Planetspindeln 2 (in Fig. 3 mit Pfeil 14 angezeigt) wechseln sich jeweils verzahnungsfreie, d. h. wal­ zenförmige Abschnitte 13 mit Abschnitten mit Schrägverzahnung 12 ab, so daß das eingegebene Material-Treibmittelgemisch zu sehr dünnen Schichten, die schneller gekühlt werden können, ausgewalzt wird und zusätzlich zwischen sich gegeneinander abrollenden Teilen eine sehr schonende, fast keine Scherenergie erzeugende Umschichtung erfährt.In the direction of rotation of the planetary spindles 2 (indicated by arrow 14 in FIG. 3), tooth-free, ie, wal-shaped sections 13 alternate with sections with helical teeth 12 , so that the material-propellant mixture entered into very thin layers that can be cooled more quickly. is rolled out and additionally undergoes a very gentle, almost no shear energy-shifting between parts rolling against each other.

Die vielfache Umschichtung der mit den gekühlten Bauteilen in Berührung kommenden dünnen Schmelzeschichten erzeugt die ef­ fektive Kühlung.The multiple redeployment of the with the cooled components in Touching thin layers of enamel creates the ef fective cooling.

Ein derartiger Umschichtungsvorgang wird in dem Planetwalzen­ kühlteil 9 verwirklicht. Durch die teilweise Entfernung der Schrägverzahnung der Planetspindeln erfährt die Schmelze in diesen Bereichen eine völlige Entspannung. Auch in dieser Ent­ spannungsphase kommt die Schmelze mit dem gekühlten Mantel des Gehäuses 4 und der gekühlten Zentralspindel 1 in Berührung, wodurch der Kühlvorgang ohne Scherbeanspruchung der Schmelze fortgesetzt wird, bis die Schmelze erneut von dem nächsten, eine Schrägverzah­ nung 12 aufweisenden Teil einer Spindel überrollt wird. Aber auch in den schrägverzahnten Beaufschlagungsbereichen ist die Scherbeanspruchung der Schmelze gering.Such a shifting process is implemented in the planetary roller cooling part 9 . Due to the partial removal of the helical toothing of the planetary spindles, the melt experiences complete relaxation in these areas. Also in this tension phase, the melt comes into contact with the cooled jacket of the housing 4 and the cooled central spindle 1 , whereby the cooling process is continued without shear stress on the melt until the melt rolls over again from the next part of a spindle having a helical toothing 12 becomes. But the shear stress of the melt is also low in the helical gearing areas.

Die auf diese Weise in kurzer Zeit heruntergekühlte Schmelze wird dann von einer Zahnradpumpe 20 erfaßt und mittels einer Blasdüse 21 als Schlauch 22 ausgestoßen. The melt cooled down in this way in a short time is then captured by a gear pump 20 and ejected as a hose 22 by means of a blowing nozzle 21 .

  • Bezugszeichenliste  A = Primärextruder
     B = Sekundärextruder
     1 = Zentralspindel
     2 = Planetspindeln
     3 = Leitung
     4 = Gehäuse
     5 = Einfülltrichter
     6 = Extruderschnecke
     7 = Treibmitteleinspritzleitung
     8 = Schneckenabschnitt
     9 = Planetwalzenkühlteil
    11 = Innenverzahnung des Gehäuses
    12 = Schrägverzahnung der Planetspindeln
    13 = verzahnungsfreie Abschnitte
    14 = Pfeil
    15 = Kühlkanal
    16 = Ringkühlkanal
    17 = Kühlkanäle
    18 = Kühlmediumeinlaufstutzen
    19 = Auslaufstutzen
    20 = Zahnradpumpe
    21 = Blasdüse
    22 = Schlauch
    M = Motor     A = primary extruder
    B = secondary extruder
    1 = central spindle
    2 = planetary spindles
    3 = line
    4 = housing
    5 = hopper
    6 = extruder screw
    7 = propellant injection line
    8 = screw section
    9 = planetary roller cooling unit
    11 = internal toothing of the housing
    12 = helical toothing of the planetary spindles
    13 = toothless sections
    14 = arrow
    15 = cooling channel
    16 = ring cooling duct
    17 = cooling channels
    18 = Coolant inlet spigot
    19 = outlet connection
    20 = gear pump
    21 = blow nozzle
    22 = hose
    M = motor

Claims (1)

Verwendung eines unabhängig vom Primärextruder (A) einer Tandemanlage antreibbaren Sekundär­ extruders (B) mit einer schrägverzahnten, an­ treibbaren Zentralspindel (1), die Kühlkanäle (15, 16) und ein daran angeschlossenes Kühl­ kreislaufsystem aufweist, mit um die Zentralspin­ del (1) herum angeordneten Planetspindeln (2), die eine wendelförmige, teilweise entfernte Schrägverzahnung (12) aufweisen und mit einem die Zentralspindel (1) und die Planetspindeln (2) koaxial aufnehmenden, radiale oder axiale Kühlkanäle (17) aufweisenden Gehäuse (4), das eine mit der Schrägverzahnung (12) der Planet­ spindeln (2) zusammenwirkende, schräge Innen­ verzahnung (11) aufweist, zum kontinuierlichen drucklosen Kühlen einer aus dem Primärextruder (A) angelieferten Kunststoff-Treibmittelgemisch- Schmelze.Use of a secondary extruder (B) which can be driven independently of the primary extruder (A) of a tandem system and has a helical toothed, drivable central spindle ( 1 ) which has cooling channels ( 15, 16 ) and a cooling circuit system connected to it, with around the central spindle del ( 1 ) arranged around planet spindles ( 2 ), which have a helical, partially removed helical toothing ( 12 ) and with a housing ( 4 ) having the central spindle ( 1 ) and the planet spindles ( 2 ) coaxially receiving, radial or axial cooling channels ( 17 ), the one with the helical teeth ( 12 ) the planet spindles ( 2 ) cooperating, oblique internal teeth ( 11 ) for the continuous pressure-free cooling of a plastic blowing agent mixture melt supplied from the primary extruder (A) .
DE3712749A 1987-04-15 1987-04-15 Use of a secondary extruder of a tandem system for cooling a plastic blowing agent mixture melt produced in a primary extruder Expired DE3712749C1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE3712749A DE3712749C1 (en) 1987-04-15 1987-04-15 Use of a secondary extruder of a tandem system for cooling a plastic blowing agent mixture melt produced in a primary extruder
IT8820046A IT1216670B (en) 1987-04-15 1988-03-31 USE AS A SECONDARY EXTRUDER OF A DEVICE FOR THE COOLING OF A MELT MIXED MIXED IN SYNTHETIC MATERIAL AND EXPANSION AGENT PRODUCED IN A PRIMARY EXTRUDER.
GB08808237A GB2204524A (en) 1987-04-15 1988-04-08 A method and apparatus for producing foamed tubes of plastics materials
JP63091866A JPS63278818A (en) 1987-04-15 1988-04-15 Method of using device for cooling molten mixture of synthetic resin manufactured by primary extruder and foaming agent as secondary extruder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3712749A DE3712749C1 (en) 1987-04-15 1987-04-15 Use of a secondary extruder of a tandem system for cooling a plastic blowing agent mixture melt produced in a primary extruder

Publications (1)

Publication Number Publication Date
DE3712749C1 true DE3712749C1 (en) 1988-07-07

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JP (1) JPS63278818A (en)
DE (1) DE3712749C1 (en)
GB (1) GB2204524A (en)
IT (1) IT1216670B (en)

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EP0376671A2 (en) * 1988-12-27 1990-07-04 The Dow Chemical Company Method and apparatus for preparing thermoplastic foam
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DE19815695A1 (en) * 1998-04-08 1999-10-14 Battenfeld Extrusionstech Planetary roll extruder, especially for producing plastic melts for extruding endless profiles of shear and temperature sensitive polymers
DE20003297U1 (en) * 2000-02-23 2000-07-06 Battenfeld Extrusionstechnik Gmbh, 32547 Bad Oeynhausen Device for plasticizing plastic material
WO2002026471A1 (en) * 2000-09-28 2002-04-04 Berstorff Gmbh Screw extruder and gear pump arrangement for highly viscous media
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WO2004091889A1 (en) * 2003-04-15 2004-10-28 3+Extruder Gmbh Multiple-shaft extruder
DE4308098B4 (en) * 1993-03-15 2005-03-10 Rust & Mitschke Entex Planetary roller extruder
DE10356350A1 (en) * 2003-11-28 2005-06-30 Battenfeld Extrusionstechnik Gmbh Temperature control for a Kustoffverarbeitungsanlage
DE19812889B4 (en) * 1998-03-24 2008-05-29 Entex Rust & Mitschke Gmbh Liquid-cooled planetary roller extruder
WO2011064651A3 (en) * 2009-11-25 2011-11-24 Polymtec Engineering Ag, Mauren (Fl), Succursale Di Lugano Closed-cell expanded article based on extruded polystyrene, method and plant to obtain said article
DE102013008201A1 (en) * 2013-05-14 2014-12-04 Gneuss Gmbh Process for producing a foam body by extrusion and extrusion apparatus for producing a foam body
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EP0376671A2 (en) * 1988-12-27 1990-07-04 The Dow Chemical Company Method and apparatus for preparing thermoplastic foam
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EP0629479A2 (en) * 1993-06-16 1994-12-21 Union Carbide Chemicals And Plastics Company, Inc. Continuous system for processing synthetic thermoplastic materials
EP0629479A3 (en) * 1993-06-16 1995-05-17 Union Carbide Chem Plastic Continuous system for processing synthetic thermoplastic materials.
DE19812889B4 (en) * 1998-03-24 2008-05-29 Entex Rust & Mitschke Gmbh Liquid-cooled planetary roller extruder
DE19815695A1 (en) * 1998-04-08 1999-10-14 Battenfeld Extrusionstech Planetary roll extruder, especially for producing plastic melts for extruding endless profiles of shear and temperature sensitive polymers
DE19815695C2 (en) * 1998-04-08 2001-09-20 Battenfeld Extrusionstech Planetary roller extruder
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Also Published As

Publication number Publication date
IT1216670B (en) 1990-03-08
GB8808237D0 (en) 1988-05-11
JPS63278818A (en) 1988-11-16
GB2204524A (en) 1988-11-16
IT8820046A0 (en) 1988-03-31

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