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:
Mar. 20, 2001
Filed:
Sep. 17, 1998
Kari Kirjavainen, Espoo, FI;
Jyri Järvenkylä, Hollola, FI;
Nextrom Holdings S.A., Ecublens, CH;
Abstract
An extruder according to the invention comprises at least two annular conical feed gaps (,) one within the other, formed between a rotatable rotor (,) and a stator (4, 5). At least some of the material to be extruded is subjected in the different feed gaps (,) of the extruder alternately to a higher pressure and then to a lower pressure. The rotor (,) or stator (,) between the feed gaps (,) can then be balanced such that the pressure effect provides a hydrodynamic bearing, whereby, when the extruder is used, even at worst a very small force is exerted on die other bearings of the rotor (,) or stator (,). By the method of the invention, a product can also be produced which contains cross-linked and at least partly oriented polyethylene.