Injection molding assembly for producing disk-shaped information

Details Injection molding assembly for producing disk-shaped information Injection molding assembly for producing disk-shaped information

1990-11-16

1992-03-03

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

With means to evacuate mold or provide controlled environment

264107, 425810, 425812, B29C 4534

Patent

active

050927590

ABSTRACT:
A bushing for the axial retention and radial centering of a matrix in an injection mold for producing information carriers such as CD's is formed on the underside of its retention shoulder with channels for carrying away the air which tends to be compressed along the outer edge of the shoulder, thereby eliminating streaks or so called schlieren in the information-carrier disk which is produced.

REFERENCES:
patent: 4374636 (1983-02-01), Holmes
patent: 4795127 (1989-01-01), Asai

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