Method and extrusion head for extruding a polymeric material
US7927531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Apr 19, 2011 |
| Priority date | — |
| Expiry date | Sep 21, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/254
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.