Process and apparatus for injection-molding product having minut

Details Process and apparatus for injection-molding product having minut Process and apparatus for injection-molding product having minut

1991-09-17

1994-07-19

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264154, 264161, 264163, 264334, 425553, 425557, 425577, 425810, B29C 4538

Patent

active

053306937

ABSTRACT:
A product, such as an optical disk substrate, having a minute surface pattern and a central hole is suitably obtained by an injection molding, wherein a resin is injected into a cavity defined by a mold including a movable half and a fixed half. The movable half is provided with an ejector ring reciprocally movable in a mold opening-and-closing direction and a gate cutter reciprocally movable at two strokes in the mold opening-and-closing direction. After the resin is injected into the cavity to form a product accompanied with a gate, the gate cutter is moved at a first stroke to cut the gate. Then the mold is opened, and substantially simultaneously with commencement of the mold opening, the product is released from the stamper and the gate cutter is moved at a second stage stroke in a direction causing the release of the product from the stamper.

REFERENCES:
patent: 4466934 (1984-08-01), Cane et al.
patent: 4715806 (1987-12-01), Ehrler et al.
patent: 4772196 (1988-09-01), Asai
patent: 5018962 (1991-05-01), Kitamura et al.
patent: 5068065 (1991-11-01), Maus et al.
patent: 5092758 (1992-03-01), Tanaka et al.
patent: 5106553 (1992-04-01), Onisawa et al.

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