Injection compression molding method for compact discs or the li

Details Injection compression molding method for compact discs or the li Injection compression molding method for compact discs or the li

1994-01-19

1995-05-23

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

2643287, 425149, 425150, B29C 4556, B29C 4576

Patent

active

054178991

ABSTRACT:
An injection compression molding method for compact discs or the like, includes the step of changing the clamping pressure or compression pressure, after the internal cavity pressure in the mold after injection has reached its peak, stepwise or continuously as the cooling proceeds, thereby making the applied pressure per unit area with respect to the effective pressure range constant. In a compact disc formed by this method, the residual stress after cooling is uniform, so that its optical properties are improved substantially.

REFERENCES:
patent: 4131596 (1978-12-01), Allen
patent: 4863651 (1989-09-01), Koten
patent: 4917840 (1990-04-01), Harada et al.
patent: 5002706 (1991-03-01), Yamashita

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