Process for improving the quality of injection moulded parts

Details Process for improving the quality of injection moulded parts Process for improving the quality of injection moulded parts

1990-03-09

1991-10-29

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264259, 264327, 2643287, H05B 646

Patent

active

050614150

ABSTRACT:
Sunk spots in critical regions of a plastics injection moulded part are prevented by localized heating of the marginal zone of the part in the course of the production cycle by means of a high frequency electromagnetic field and application of a pressure in this region.

REFERENCES:
patent: 3350487 (1967-10-01), Hofer et al.
patent: 4439492 (1984-03-01), Wada et al.
patent: 4489018 (1984-12-01), Ball
patent: 4536242 (1985-08-01), Gripenholt et al.
patent: 4548773 (1985-10-01), Suh et al.
patent: 4562026 (1985-12-01), Mosher
patent: 4707310 (1987-11-01), Debeaud
"Ullmann's Encyclopedia of Industrial Chemistry", vol. B3, pp. 15-5 to 15-8.

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