Method and extrusion head for extruding a polymeric material
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United States of America Patent
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Apr 19, 2011
Grant Date -
May 19, 2005
app pub date -
Dec 21, 2001
filing date -
Dec 21, 2001
priority date (Note) -
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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.
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