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:
Feb. 07, 2006
Filed:
Feb. 13, 2003
Didier Calvar, Beaumont, FR;
Bernard Marechal, Orleat, FR;
Didier Calvar, Beaumont, FR;
Bernard Marechal, Orleat, FR;
Michelin Recherche et Technique S.A., Granges-Paccot, CH;
Abstract
The invention concerns a process and apparatus for the coextrusion of rubber mixtures, comprising a main extruder () with an extrusion head () having at least two flow channels (), each for a rubber mixture (A, B), the channels opening into an extrusion orifice () through which the two rubber mixtures (A, B) are propelled. The extrusion orifice () is delimited by a first wall () and a second wall (). The apparatus also comprises at least one micro-extruder () for a third rubber mixture (C), whose extrusion head () is provided at its end with a nozzle () passing through the two flow channels () such that the third rubber mixture (C) is inserted into each rubber mixture (A, B) upstream from the extrusion orifice ().