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 inletInfo
- 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- Withdrawn
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
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)
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 |
Family
ID=6062428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2904720A1 (en) |
Cited By (5)
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 |
-
1979
- 1979-02-08 DE DE19792904720 patent/DE2904720A1/en not_active Withdrawn
Cited By (8)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |