Plastic and nonmetallic article shaping or treating: processes – Forming sound grooves in records – Die pressing disk type records
Patent
1980-01-14
1982-02-16
Cannon, James C.
Plastic and nonmetallic article shaping or treating: processes
Forming sound grooves in records
Die pressing disk type records
156219, 156220, 15624419, 15624424, 264106, 264171, 264176R, 2642102, 425810, 428 65, 428323, 428515, 428520, B29C 2400, B29D 1700, B29F 310, B32B 2708, B32B 3130
Patent
active
043158781
ABSTRACT:
It has been found that a layered recording disc having an inexpensive core layer and high quality recording groove-accepting outer layers can be made in a relatively simple manner through an application of the technique known as coextrusion, wherein a common die, e.g. a coextrusion die (10) having a die orifice (11) for a plurality of streams (13, 23, and 33) provides a multilayer coextrudate (60) having a plurality of layers (64, 74, and 84). The coextrudate (60) can be cut into segments (60a) with a suitable cutting means (20). The coextrudate segments can be substantially of record thickness with a circular periphery. Alternatively, coextrudate segments (60b) can be much thicker than a record and much smaller in surface area. In either case, segments can be compression molded into discs (100) having the desired profile and/or grooves.
REFERENCES:
patent: 2039140 (1936-04-01), Barton
patent: 2529683 (1950-11-01), Keefe
patent: 3072519 (1963-01-01), Salzman
patent: 3665136 (1972-05-01), Westermann
patent: 3687769 (1972-08-01), Dague
patent: 3768946 (1973-10-01), Matuschke
patent: 4034033 (1977-07-01), Carrere
Burt, Journal of Audio Engineering, vol. 25 (1977), pp. 712-723.
Chemical Week, Dec. 20, 1978, pp. 51-52.
Lindmark, Jr. Richard C.
Van Dover Dennis W.
Cannon James C.
H. B. Fuller Company
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