G - Physics – 11 – B
Patent
G - Physics
11
B
18/101, 181/66
G11B 23/00 (2006.01) B29C 43/02 (2006.01) B29C 47/06 (2006.01)
Patent
CA 1144483
Abstract of the Disclosure 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 thorugh an application of the technique known as coextrusion, wherein a common die, e.g. a coextrusion die (10) having a die orifice (11) far 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.
368355
Lindmark Richard C.
Van Dover Dennis W.
Fuller (h.b.) Company
Ridout & Maybee Llp
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