Process for extrusion coating of a wire with a cellular thermopl

Details Process for extrusion coating of a wire with a cellular thermopl Process for extrusion coating of a wire with a cellular thermopl

1976-10-27

1980-01-01

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264 53, 264 54, 264174, 264211, 264DIG5, 264DIG13, 264DIG18, 366 81, 366 89, B29D 2700

Patent

active

041816471

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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