Apparatus for molding a recorded disc

Details Apparatus for molding a recorded disc Apparatus for molding a recorded disc

1981-02-03

1982-06-15

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Severing means is perforator

264107, 264155, 264163, 425810, 425DIG51, B29D 1700

Patent

active

043348491

ABSTRACT:
An apparatus for molding recorded discs includes a pair of opposed mold plates at least one of which is adapted to move toward and away from the other. The mold plates have opposed surfaces which are adapted to form a mold cavity therebetween. A center plate is mounted in each of the mold plates with each center plate having a surface adjacent the opposed surface of the mold plate. One of the center plates has a passage therethrough with a center hole forming pin slidably mounted in the passage. The one center plate has an annular groove in the surface of the passage adjacent the end surface of the center plate. The groove is adapted to receive some of the molding material to form a seal between the center plate and the center hole forming pin and thereby minimize the extent of the formation of flash on the surface of the molded disc.

REFERENCES:
patent: 1576642 (1926-03-01), Bishop
patent: 3833328 (1974-09-01), Palmer
patent: 3989436 (1976-11-01), McNeely
patent: 4185955 (1980-01-01), Holmes

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