Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Reexamination Certificate
2004-03-22
2008-05-20
Davis, Robert B. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
C425S381000, C425S462000, C425S465000, C425S466000, C425S467000
Reexamination Certificate
active
07374412
ABSTRACT:
In an extrusion head and an extrusion method for the production of a tubular multilayer preform the extrusion head includes at least two feed paths for feeding plasticised plastic material from one or more extruders to an annular passage arrangement. The annular passage arrangement includes mutually concentric annular passages forming mutually separate flow paths for the various layers of the preform. An annular gap nozzle has an annular gap communicating with the annular passage arrangement, and at least one flow passage communicates with an annular passage of the annular passage arrangement, for the introduction of a translucent viewing strip. The flow passage communicates with the annular passage in question upstream of the annular gap in the region of separation of the flow paths.
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EPO Search Report dated Jul. 7, 2004, received in co-pending EPO Application No. 04002867.2, 3 pgs.
Balzer Martin
Doehmen Willi
Eckerskorn Heinz-Werner
Forst Lutz
Kluesener Peter
Davis Robert B.
Grossman Tucker Perreault & Pfleger PLLC
Kautex Maschinenbau GmbH
Leyson Joseph
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