Moulding of gramophone records

Details Moulding of gramophone records Moulding of gramophone records

1975-02-03

1976-02-10

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264154, 264161, 264163, B29D 1700

Patent

active

039377792

ABSTRACT:
In a method of moulding gramophone records, the hole is formed by co-operating hole forming members which can extend into the mould cavity and which are pressed together at a position within the thickness of the record. One of the members is subsequently extended further and moves beyond this position, so that any web or flash which may be formed between the hole forming members is separated from the article after which the mould cavity opened and the article is removed. The machine described is for the injection moulding of gramophone records and one of the hole forming members is the nozzle tip of the injection nozzle. The other hole forming member is a counterpiece, which is the member which undergoes the further extension by pushing back the nozzle tip upon decompression of the mould cavity.

REFERENCES:
patent: 2613395 (1952-10-01), Massler
patent: 2698460 (1955-01-01), Amo
patent: 3649728 (1972-03-01), Honsho
patent: 3671158 (1972-06-01), Rand

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