Apparatus for the injection moulding of disc records

Details Apparatus for the injection moulding of disc records Apparatus for the injection moulding of disc records

1985-05-06

1987-07-21

Woo, Jay H.

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

249141, 264107, 425554, 425810, 425812, B29C 4534

Patent

active

046815279

ABSTRACT:
Two matrices, each bearing modulation to form a microgroove disc record, are fixed to half-moulds by means of sleeves, having first and second fixing flanges which extend into the gap between the matrices. One of the flanges is an annular blade whose inner radial surface defines the edge of a moulded disc and whose thickness is slightly less than that of the moulded disc. Formed integrally with, or attached to, the blade is a group of radially outwardly extending lugs which are attached to the body of its associated sleeve. The other flange comprises a second group of lugs mounted to the body of its associated sleeve radially outward of the blade such that the second group of lugs may lie in the spaces between the first mentioned group of lugs. The thickness of the lugs of the second group determines the thickness of the disc and the thickness of the lugs of the first and second groups differs, to determine a gap for escape of air along the first flange. Spaces between the groups of the two interlaced lugs permit a controlled escape of air from the periphery of the record without the formation of peripheral flash.

REFERENCES:
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4374636 (1983-02-01), Holmes
patent: 4431047 (1984-02-01), Takeshima et al.

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