Method and extrusion head for extruding a polymeric material

Details Method and extrusion head for extruding a polymeric material Method and extrusion head for extruding a polymeric material

2011-04-19

2011-04-19

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

Reexamination Certificate

active

07927531

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.

REFERENCES:
patent: 3229012 (1966-01-01), Garner
patent: 3530916 (1970-09-01), Williams
patent: 5690971 (1997-11-01), Buluschek
patent: 2001/0010828 (2001-08-01), Beckmann et al.
patent: 2006/0182831 (2006-08-01), Balconi et al.

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