Production of thermoplastic billets and preforms

Details Production of thermoplastic billets and preforms Production of thermoplastic billets and preforms

1976-11-22

1979-05-15

Thurlow, Jeffery R.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

264 25, 264 461, 264173, 264237, 264245, 264325, 264327, B29F 310

Patent

active

041548930

ABSTRACT:
Thermoplastic resin is converted to void free billets and preforms, by techniques including: compaction of heated thermoplastic powders: compactionof heated extruded strands: rolling of heated ingots of plastic: simultaneous extrusion and combining of two or more groups of strands: coextrusion of two or more resin formulations: sequential compaction of dual powders: extrusion with differentially heated dies. The billets may be non-homogeneous in response to dielectric heating, to produce controlled temperature zones within the heated polymers, when used as billets and preforms.

REFERENCES:
patent: 3103409 (1963-09-01), Bohres et al.
patent: 3121130 (1964-02-01), Wiley et al.
patent: 3359130 (1967-12-01), Goldman
patent: 3379799 (1968-04-01), Goldman
patent: 3488747 (1970-01-01), Cleereman
patent: 3608058 (1971-09-01), Coffman
patent: 3739052 (1973-06-01), Ayres et al.
patent: 3846522 (1974-11-01), Goldman
patent: 3857914 (1974-12-01), Aishima et al.
patent: 3956438 (1976-05-01), Schippers

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