US 5,304,053 AGranted

Apparatus for extrusion of plastic and/or rubber mixtures

AssigneePaul Troester Maschinenfabrik

InventorsHans-Joachim Gohlisch, Wilfried Baumgarten

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Abstract

Apparatus for extruding plastic and/or rubber material has a screw extruder, which plasticizes the material and delivers it to a gear pump which develops sufficient pressure for extrusion of the material through an extrusion head. The apparatus is characterized by the fact that the axes of gears of the gear pump and the axis of the screw of the extruder are parallel to one another. The housing of the gear pump has a side opening into which a cylindrical bushing and the screw of the extruder extend so that the material is delivered by the extruder directly to the gear pump as a non-oriented plasticized mass. The extrusion head may be a transverse extrusion head with an axis parallel to the axes of the gear wheels of the gear pump and the axis of the screw of the extruder. A second like extrusion apparatus including a screw extruder and a gear pump may be connected to an opposite side of the extrusion head.

Claims4

Dependent claims

Apparatus for extrusion of viscous material selected from the group consisting of plastic material and elastomeric material comprising

a gear pump comprising a housing having a gear chamber, an inlet passage opening into said gear chamber and a discharge passage opening out of said gear chamber, two intermeshing gears rotatable in said gear chamber about parallel axes, said intermeshing gear wheels having an inlet bight opening into said inlet passage and a discharge bight opening into said discharge passage, said housing having a blind cylindrical bore which extends into said housing parallel to said axes of said gear wheels and has an inner end closed by a wall of said housing, said cylindrical bore communicating with said inlet passage of said housing,
a screw extruder comprising an extruder cylinder, a cylindrical bushing in said cylinder and an extruder screw rotatable in said bushing, said extruder screw having at least one continuous helical flight through its length,
said screw extruder being assembled with said gear pump with an end portion of said cylindrical bushing extending into said cylindrical bore of said gear pump housing and with an axis of rotation of said extruder screw parallel to and spaced laterally from said axes of rotation of said gears of said gear pump.

Dependencies are inferred from the claim text.

Facts

Application: 07/880,232Filed 8 May 1992
Priority: DE 411524610 May 1991
Granted: 19 Apr 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B29C 48/645
Screws with two or more threads: neighbouring threads and channels having identical configurations
B29C 48/12
Characterised by the shape of the extruded material at extrusion: articles with an irregular circumference when viewed in cross-section, e.g.…
B29C 48/34
With annular openings, e.g. for forming tubular articles: cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding…
B29C 48/37
Using pumps, e.g. piston pumps: gear pumps