Process for extrusion coating of a wire with a cellular thermoplastic resin material
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United States of America Patent
Stats
-
Jan 1, 1980
Issued Date -
N/A
app pub date -
Oct 27, 1976
filing date -
Jan 11, 1973
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus are provided for the extrusion of a thermoplastic material in modified form in which the thermoplastic material is introduced into the barrel of a screw extruder, and is heated and forced through the barrel: the material is passed through valve means which together with the temperature of the material is effective to produce a melt transition in the material at a predetermined point and to thoroughly mix the material; subsequently, the material is forced into a low pressure zone in the barrel where a modifying agent is introduced into the material; the resultant mass is forced out of the low pressure zone, and is passed through a mixing means effective to intensify the dispersion of the modifying agent in the mass, the mass is extruded and the extruded material collected.
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