Manufacture of a molding from a thermoplastic powder or granular

Details Manufacture of a molding from a thermoplastic powder or granular Manufacture of a molding from a thermoplastic powder or granular

1983-06-29

1984-12-11

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 71, 4251742, B29F 500

Patent

active

044877285

ABSTRACT:
Moldings, for example hollow articles, are produced by sintering a thermoplastic powder or granular material and then reshaping the resulting blank by thermoforming. Sintering is carried out in a mold cavity under pressure, by exposure to high-frequency vibrations, which heats the plastic to a temperature intermediate between its softening point and its melting point. In this way, grain boundary adhesion between the individual plastic particles constituting the blank results, and the directly subsequent thermoforming can be carried out without additional supply of heat.

REFERENCES:
patent: 3471601 (1969-10-01), Goetgheluck
patent: 3717427 (1973-02-01), Bodine
patent: 4014965 (1977-03-01), Stube et al.
Saechling-Zebrowski, "Kunststoff-Taschenbuch", 19th Edition, 1974, p. 55-57 and pp. 174-182.

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