Plastic molding method

Details Plastic molding method Plastic molding method

1994-05-12

1995-05-30

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 64, 264336, 425577, 425468, B29C 3936

Patent

active

054198658

ABSTRACT:
A method of making plastic molding consists of a boxlike body having an field of multiple fine conical holes. The internal diameter of the fine conical holes gradually decreases from the inner surface of the plastic molding toward the outer surface of the plastic molding, and is in the range 0.1-0.5 mm at the outer surface. The fine conical holes are hardly visible when the outer surface of the box is viewed; ventilation is provided without detriment to the aesthetic appearance of the exterior of the box, and it is not necessary to cover the ventilation holes in the box to keep them out of sight. Conical projection on a male mold are withdrawn before the plastic molding hardens completely and the male mold is separated from a female mold after the plastic material has hardened completely.

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patent: 3397441 (1968-08-01), Rich
patent: 3595337 (1970-03-01), Furey et al.
patent: 4395075 (1983-07-01), Barrett et al.
patent: 4395079 (1983-07-01), Barrett et al.
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patent: 4600622 (1986-07-01), Carlson et al.
patent: 4873043 (1989-10-01), Meyers
patent: 5167898 (1992-12-01), Luther
patent: 5252279 (1993-10-01), Gore et al.

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