Method for molding a disc with a central aperture

Details Method for molding a disc with a central aperture Method for molding a disc with a central aperture

1994-11-01

1996-08-13

Wu, David W.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264106, 264334, 425556, 425810, B29C 4500

Patent

active

055453651

ABSTRACT:
A central aperture of a molded disc being severed by protruding of the gate cutter and also a molded disc being released from a cavity by blowing of air from the passage provided between an inner periphery of the central stamper holder and an outer periphery of the bushing into the cavity, the molten resin with which the protruded gate cutter is surrounded, is pressed by the first protrusion of an ejector sleeve for preventing occurrence of a round corner D formed along the edge of the central aperture and for preventing generating of the clouds on the surface of the information area of the disc.

REFERENCES:
patent: 4772196 (1988-09-01), Asai
patent: 5092758 (1992-03-01), Tanaka et al.
patent: 5297951 (1994-03-01), Asai

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