Method for treating an extruded plastic section and extrusion installation therefor
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United States of America Patent
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Apr 10, 2001
Grant Date -
N/A
app pub date -
Oct 29, 1997
filing date -
May 3, 1995
priority date (Note) -
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Abstract
Method for treating an extruded plastic section having a hollow space and installation suitable for carrying out such a treatment. The installation includes an extruder which has a core for forming the hollow space in the section and, at a distance downstream from the extruder in the extrusion direction of the section, a closing means having a rigid circumferential wall. The installation also has a first conduit connected to a supply orifice which is provided in the circumferential wall of the closing means, a fluid feeder connected to the first conduit and a second conduit connected to a discharge orifice. The discharge orifice is upstream of the supply orifice to provide a fluid film flowing opposite to the extrusion direction between the circumferential wall of the closing means and the extruded section.
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