Method for the manufacture of flexible disks

Details Method for the manufacture of flexible disks Method for the manufacture of flexible disks

1981-12-22

1983-06-07

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

Die pressing disk type records

264155, 264163, B29D 1700

Patent

active

043870686

ABSTRACT:
Method for the manufacture of flexible disks from engraved moulds by means of a compression press comprising starting with a roll of plastic material and bringing a strip of material between the open plates of a compression press without making a preliminary hole in said strip. A preliminary hole is made during the closing of the plates by means of a first punch matched to a complementary punch, said punches serving as centering means for the two moulds, then by the guidance of the first punch in the complimentary punch for the centering of the moulds with respect to one another. The central hole is cut when the plates are closed by means of the complementary punch which is maintained in the raised position throughout the end of the pressing cycle.

REFERENCES:
patent: 1407633 (1964-09-01), Phillipson
patent: 3221367 (1965-12-01), Cavalier
patent: 3298059 (1967-01-01), Sakamoto
patent: 4085178 (1978-04-01), McNeely
patent: 4213927 (1980-07-01), Alberti

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