Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1979-05-31
1981-02-10
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264174, 264211, 425113, 425208, 425209, B29F 310
Patent
active
042501326
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.
REFERENCES:
patent: 3287477 (1966-11-01), Vesilind
patent: 3627867 (1971-12-01), Schwarz
patent: 3679788 (1972-07-01), Kiyono et al.
patent: 3762693 (1973-10-01), DeBoo et al.
patent: 3923947 (1975-12-01), Cook
Anderson Philip
Mitchell Robert E.
Murphy Kevin P.
Phillips Cables Limited
Swabey Alan
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