DE2904720A1 - Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet - Google Patents

Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet

Info

Publication number
DE2904720A1
DE2904720A1 DE19792904720 DE2904720A DE2904720A1 DE 2904720 A1 DE2904720 A1 DE 2904720A1 DE 19792904720 DE19792904720 DE 19792904720 DE 2904720 A DE2904720 A DE 2904720A DE 2904720 A1 DE2904720 A1 DE 2904720A1
Authority
DE
Germany
Prior art keywords
tool
strand
thermoplastic material
extruded
open space
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.)
Withdrawn
Application number
DE19792904720
Other languages
German (de)
Inventor
Arnold Grotemeyer
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.)
GROTEMEYER GEB
Original Assignee
GROTEMEYER GEB
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 GROTEMEYER GEB filed Critical GROTEMEYER GEB
Priority to DE19792904720 priority Critical patent/DE2904720A1/en
Publication of DE2904720A1 publication Critical patent/DE2904720A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/043—Skinned foam

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

An open space is left between the outlet of the extrusion tool and the inlet of the calibrating arrangement in the prodn. of a continuous strand of foamed thermoplastic material with a closed smooth surface structure. The outlet of the tool through which the mixt. of foam cpds. is extruded is smaller than the inlet of the calibrating device, which has cooling channels and is also connected to a vacuum. The arrangement accelerates the prodn. of the strand and at the same time prevents the collapse of the surface.

Description

"Vorrichtung zum Herstellen eines Schaumstoffstranges aus"Device for producing a foam strand from

thermoplastischem Kunststoff" Die Erfindung bezieht sich auf eine Vorrichtung zum Herstellen eines endlosen Schaumstoffstranaes aus thermoplastischem Kunststoff mit gleichmäßiger Zellenstruktur und einer geschlosDenen glatten Oberflächenhaut durch Strangpressen einer schäumbaren Kunststoffmischung und mit einer Kalibriervorrichtung sowie einer Kühleinrichtung zum Kühlen des Stranges unter die Erstarrungstemperatur der Kunststoffmischunq.thermoplastic plastic "The invention relates to a Device for producing an endless foam strand made of thermoplastic Plastic with a uniform cell structure and a closed, smooth surface skin by extrusion of a foamable plastic mixture and with a calibration device and a cooling device for cooling the strand below the solidification temperature the plastic mixture.

Die Anwendung extrudierter Schaumprofile ist dann besonders interessant und sinnvoll, wenn ein niedriger Volumenpreis des Enderzeugnisses gewünscht wird. Thermoplastische extrudierte Schaumstoffprofile sind daher seit vielen Jahren bekannt und ihre Anwendung nimmt laufend zu.The use of extruded foam profiles is then particularly interesting and useful if a low volume price of the end product is desired. Thermoplastic extruded foam profiles have therefore been known for many years and their use is increasing all the time.

,'3blicherweise wird bei diesen Verfahren so vor«egange.n, cad @n eie Werkzeug des Extruders die vorläufige Formgebung des thermoplastischen Kunststoffes erfolgt. Der Aufbau des Werkzeuges verhindert dabei weitgehend bei den bekannten Verfahren ein Expandieren des Werkstoffes innerhalS des Werkzeuges, und zwar cad ch, daß der Werkstoff, d.h. also die Ausgangsmasse, unter Vermeidung von starken Umlenkungen des Massestromes geführt wird, wobei die Werkzeuglängen auf die Profilquerschnitte und damit auf die Materialmassen abgestimmt sind.'' 3Usually, in these procedures, this is preceded by «egange.n, cad @n eie tool of the extruder the preliminary shaping of the thermoplastic material he follows. The construction of the tool largely prevents the known ones Method of expanding the material inside the tool, namely cad ch that the material, i.e. the initial mass, avoiding strong Deflections of the mass flow is performed, with the tool lengths are matched to the profile cross-sections and thus to the material masses.

Das Erzeugen ungleicher Profilquerschnitte kann durch den Einbau von Verdrängern als Fließbremse bei gleicher Fließgeschwindigkeit erreicht werden.The creation of unequal profile cross-sections can be achieved by installing Displacement can be achieved as a flow brake at the same flow speed.

Der Erfindung liegt die Aufgabe zugrunde, die bisher bekannten Werkzeuge dadurch zu verbessern, da3 ein schnelleres Arbeiten möglich ist und daß ein Einfallen der Oberfläche verhindert wird.The invention is based on the object of the previously known tools to be improved by the fact that a faster work is possible and that a fall in the surface is prevented.

Diese der Erfindung zugrundeliegende Aufgabe wird gelöst durch einen Freiraum zwischen Werkzeugmundstück und Kalibriervorrichtung, wobei die Werkzeugöffnung kleiner als die Eingangsöffnung der Kalibriervorrichtung ist, so daß in diesem vorstehend definierten Freiraum ein Expandieren des Schaumstoffes erfolgen kann, wobei aber die Oberfläche des Schaumstoffes schon ausreichend ausgehärtet oder fest ist, um problemlos in die Kalibriervorrichtung eingeführt zu werden, in der dann ein endgültiges .xusschäumen des Werkstoffes erfolgt. Hierbei wird so vor(3eganben, daß an die Kalibriervorrichtung oder an das alibrierwrz Kühlkanäle angeschlossen sind und um ein Einfallen des aterials in der Kalibriervorrichtung zu verhindern ist vorgesehen, daß eine Vakuumquelle an die Kalibriervorrichtung angeschlossen wird, die den Expansionsvorgang des Kunststoffes weiterhin unterstützt.This object on which the invention is based is achieved by a Free space between the tool mouthpiece and the calibration device, the tool opening is smaller than the inlet opening of the calibration device, so that in this above defined free space an expansion of the foam can take place, but the surface of the foam is already sufficiently hardened or firm to to be easily introduced into the calibration device, in which a final .xus foaming of the material takes place. This is done in such a way that the calibration device or cooling channels are connected to the calibration tool and prevent the aterials from collapsing In the calibration device it is provided that a vacuum source is connected to the calibration device, the expansion process of the plastic still supported.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnung erläutert.An exemplary embodiment of the invention is described below with reference to FIG Drawing explained.

In der Zeichnung ist mit 1 das Mundstück des Werkzeuges bezeichnet, mit 2 der Massestrom des Kunststoffes und allgemein mit 3 die Kalibriervorrichtung. An diese Kalibriervorrichtung schließen bei 4, 5 und 6 Kühlkanäle an, wobei bei dem dargestellten Ausführungsbeispiel durch die Pfeile angedeutet ist, wie das Kühlmedium durch diese Kanäle geführt wird.In the drawing, 1 denotes the mouthpiece of the tool, with 2 the mass flow of the plastic and generally with 3 the calibration device. This calibration device is connected to cooling channels at 4, 5 and 6, where at the illustrated embodiment is indicated by the arrows, as the cooling medium is guided through these channels.

Bei 7 ist der Anschluß einer Vakuumquelle angedeutet, wobei diese Vakuumquelle auf die Außenhaut des Ziehstückes einwirkt und dadurch ein Zusammenfallen des Kunststoffprofiles in der Kalibriervorrichtung verhindert.At 7 the connection of a vacuum source is indicated, this The vacuum source acts on the outer skin of the drawing piece, causing it to collapse of the plastic profile in the calibration device prevented.

Zwischen der Mündung des Werkzeuges 1 und der eigentlichen Kalibriervorrichtung 3 ist ein Freiraum 8 erkennbar, in welchem der Massestrom des Kunststoffes leicht expandiert hat und nahezu die endgültige Form erreicht hat. In diesem Zustand wird er in das Kalibrierwerkzeug 3 einer.Between the mouth of the tool 1 and the actual calibration device 3 a free space 8 can be seen in which the mass flow of the plastic is easy has expanded and has almost reached its final shape. In this state will he into the calibration tool 3 one.

Selbstverständlich ist die Erfindung nicht auf das dargesteiffite Ausführungsbeispiel beschränkt, sondern es sind demgegenüber ,+ änderungen möglich, ohne den Grundgedanken der Erfindung zu verlassen.Of course, the invention is not limited to that shown Embodiment is limited, but there are, on the other hand, + changes possible, without departing from the basic idea of the invention.

LeerseiteBlank page

Claims (3)

"Vorrichtung zum Herstellen eines Schaumstoffstranges aus thermoplastischem Kunststoff" Patentansprüche: Vorrichtung zum Herstellen eines endlosen Schaumstotf stranges aus thermoplastischem Kunststoff mit c;leichmäßiger Zellenstruktur und einer geschlossenen glatten Oberflächenhaut durch Stranqpressen einer schäumbaren Kunststoffmischung und mit einer Kalibriervorrichtung sowie einer Kühleinrichtung zum Kühlen des Stranges unter die Erstarrungstemperatur der Kunststoffmischung, gekennzeichnet durch einen Freiraum (o) zwischen ;verkzeugmundstuck (1) und Kalibriervorichtung (3), wobei die Werkzeugöffnung kleiner jls die Eingangsöffnung der Kalibriervorrichtung ist. "Device for producing a strand of thermoplastic foam Plastic "claims: device for producing an endless foam stump strand made of thermoplastic material with c; light cell structure and a closed smooth surface skin by extruding a foamable one Plastic mixture and with a calibration device and a cooling device for cooling the strand below the solidification temperature of the plastic mixture, characterized by a free space (o) between; tool mouthpiece (1) and calibration device (3), the tool opening being smaller than the inlet opening of the calibration device is. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Kalibrierwerkzeug (3) Kühlkanäle (4, 5, 6) aufweist.2. Apparatus according to claim 1, characterized in that the calibration tool (3) has cooling channels (4, 5, 6). 3. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Kalibrierwerkzeug (3) an eine Vakuumquelle (bei 7) anschließbar ist.3. Apparatus according to claim 1 and 2, characterized in that the calibration tool (3) can be connected to a vacuum source (at 7).
DE19792904720 1979-02-08 1979-02-08 Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet Withdrawn DE2904720A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792904720 DE2904720A1 (en) 1979-02-08 1979-02-08 Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792904720 DE2904720A1 (en) 1979-02-08 1979-02-08 Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet

Publications (1)

Publication Number Publication Date
DE2904720A1 true DE2904720A1 (en) 1980-08-21

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DE19792904720 Withdrawn DE2904720A1 (en) 1979-02-08 1979-02-08 Calibrated foamed strand of thermoplastic material - extruded across open space from smaller outlet to larger inlet

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3104167A1 (en) * 1980-11-05 1982-06-16 Lavorazione Materie Plastiche L.M.P. S.p.A., Torino METHOD FOR PRODUCING A CONTINUOUS FOAM SHEET FROM THERMOPLASTIC SYNTHETIC POLYMER BY MEANS OF EXTRUSION AND DEVICE FOR CARRYING OUT THE METHOD
EP0925900A1 (en) * 1997-12-26 1999-06-30 Sumitomo Chemical Company, Limited Device for manufacturing foamed thermoplastic resin sheet
EP2420373A2 (en) 2010-08-20 2012-02-22 Rundpack AG Method for producing an opaque moulded part
EP2743051A1 (en) 2012-12-14 2014-06-18 Promix Solutions AG Method for cooling of foamed plastic materials
WO2015097060A1 (en) * 2013-12-23 2015-07-02 Solvay Specialty Polymers Usa, Llc Method for producing a foamed extruded film

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3104167A1 (en) * 1980-11-05 1982-06-16 Lavorazione Materie Plastiche L.M.P. S.p.A., Torino METHOD FOR PRODUCING A CONTINUOUS FOAM SHEET FROM THERMOPLASTIC SYNTHETIC POLYMER BY MEANS OF EXTRUSION AND DEVICE FOR CARRYING OUT THE METHOD
EP0925900A1 (en) * 1997-12-26 1999-06-30 Sumitomo Chemical Company, Limited Device for manufacturing foamed thermoplastic resin sheet
AU751954B2 (en) * 1997-12-26 2002-09-05 Sumitomo Chemical Company, Limited Manufacturing device of foamed thermoplastic resin sheet
US6520759B2 (en) 1997-12-26 2003-02-18 Sumitomo Chemical Company, Limited Manufacturing device of foamed thermoplastic resin sheet
EP2420373A2 (en) 2010-08-20 2012-02-22 Rundpack AG Method for producing an opaque moulded part
WO2012021915A2 (en) 2010-08-20 2012-02-23 Greiner Packaging International Gmbh Process for producing an opaque moulding
EP2743051A1 (en) 2012-12-14 2014-06-18 Promix Solutions AG Method for cooling of foamed plastic materials
WO2015097060A1 (en) * 2013-12-23 2015-07-02 Solvay Specialty Polymers Usa, Llc Method for producing a foamed extruded film

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