Molding apparatus and molding method for light-permeable article

Details Molding apparatus and molding method for light-permeable article Molding apparatus and molding method for light-permeable article

1997-10-02

1999-10-05

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

2643281, 425210, 425225, 425546, B29C 4524

Patent

active

059618981

ABSTRACT:
A molding apparatus for light-permeable articles which includes a nozzle that is movable up and down. A suction path and a suction device connected to the suction path are provided so as to suck a gas at a contact face of a sprue bush and its vicinity during the up/down movement of the nozzle. Accordingly, foreign substances, invading the mold can be sucked up before the apparatus performs a molding operation. Therefore, foreign substances are prevented from being mixed into the molded product. The molded product is accordingly improved in quality and yield.

REFERENCES:
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patent: 4921416 (1990-05-01), Green
patent: 5174932 (1992-12-01), Johnson et al.
patent: 5217661 (1993-06-01), Noguchi et al.
patent: 5454991 (1995-10-01), Brew
patent: 5478227 (1995-12-01), Kuse
patent: 5542835 (1996-08-01), Kennedy et al.

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