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:
Apr. 19, 2011
Filed:
Dec. 21, 2001
Valter Castiglioni, Magenta, IT;
Angelo Riella, Pozzolo Formigaro, IT;
Sergio Belli, Leghorn, IT;
Luca Balconi, Bresso, IT;
Valter Castiglioni, Magenta, IT;
Angelo Riella, Pozzolo Formigaro, IT;
Sergio Belli, Leghorn, IT;
Luca Balconi, Bresso, IT;
Prysmian Cavi E Sistemi Energia S.R.L., Milan, IT;
Abstract
An extrusion method and head for depositing by extrusion a polymeric material intended, in particular, for the production of cables includes a core and a coating layer arranged at a radially outer position with respect of the core. The method includes the steps of feeding the polymeric material in a feeding duct of the extrusion head and of conveying a part of the polymeric material towards an undercut extending in the extrusion head in proximity of an end of the feeding duct. The method provides a sealing force between a head body and a conveyor element of the extrusion head exerted by means of the pushing action exerted by the polymeric material in the undercut in a direction substantially perpendicular to the longitudinal axis of the head body.