The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2008
Filed:
Mar. 22, 2004
Martin Balzer, Sankt Augustin, DE;
Willi Doehmen, Moenchengladbach, DE;
Heinz-werner Eckerskorn, Neunkirchen-Seelscheid, DE;
Lutz Forst, Hennef, DE;
Peter Kluesener, Bonn, DE;
Roger Stehr, Duesseldorf, DE;
Michael Pappert, Eitorf, DE;
Martin Balzer, Sankt Augustin, DE;
Willi Doehmen, Moenchengladbach, DE;
Heinz-Werner Eckerskorn, Neunkirchen-Seelscheid, DE;
Lutz Forst, Hennef, DE;
Peter Kluesener, Bonn, DE;
Roger Stehr, Duesseldorf, DE;
Michael Pappert, Eitorf, DE;
Kautex Maschinenbau GmbH, Bonn, DE;
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.