Injection mold for molding discs

Details Injection mold for molding discs Injection mold for molding discs

1996-01-30

1997-12-23

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Mold having movable core or movable pin

264106, 425810, B29C 4538

Patent

active

057005010

ABSTRACT:
An injection mold for molding discs is provided, wherein the injection mold comprises a base die, a board fitted inside the base die, a stamper in the form of a doughnut fitted to the front surface of the board, an outer ring fitted to the front end of the base die, and a sleeve having a flange fitted to the center of the board, the ring and/or the flange fixing the stamper to the board. The injection mold further comprises a thin disc thicker than the stamper interposed closely between the stamper and the board so as that the front surface of the thin disc contacts with the back surface of the stamper. According to the thus constructed injection mold of the present invention, it is possible to prevent dust or dirt from sticking when the stamper is replaced in the field, and to make it unnecessary to replace the mirror surface board, by mounting the combination of the stamper and thin disc on the mold.

REFERENCES:
patent: 5330693 (1994-07-01), Takada

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