Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Removing surface portion of composite workpiece to expose...
Patent
1989-07-10
1991-09-10
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Removing surface portion of composite workpiece to expose...
264159, 264163, 264294, 264300, 264304, 264310, 425296, 425392, 425402, 425403, 425404, B29C 4112, B29C 4142, B29C 4148
Patent
active
050471929
ABSTRACT:
Process of manufacturing a cryogenic regenerator including a plurality of channels for conducting a working fluid, including the steps of providing a cylindrical forming member having a longitudinal axis and a plurality of peripheral slots displaced axially and oriented substantially parallel to the longitudinal axis of the cylindrical forming member, or having a continuous spiral peripheral slot of sufficiently small pitch such that the convolutions thereof are oriented substantially parallel to such longitudinal axis; providing epoxy which is relatively flexible upon hardening, loading the epoxy with thermally conductive material for enhancing the radial thermal conductivity of the cryogenic regenerator, and applying the epoxy to the periphery of the cylindrical forming member to fill the plurality of slots or the spiral peripheral slot with the epoxy and to form a radial layer of the epoxy of a generally first radial thickness allowing the epoxy to harden and thereafter reducing the radial thickness of the peripheral layer of hardened epoxy to a second smaller radial thickness; splitting the hardened relatively flexible epoxy radially and parallel to the axis and thereafter removing the epoxy from the cylindrical forming member to provide a relatively flexible base layer from the epoxy formerly residing on the periphery of the cylindrical forming member and to provide a plurality of substantially parallel corrugations from epoxy formerly residing in the plurality of slots or the spiral peripheral slot, the corrugations extending outwardly from a bottom of the base layer; and rolling the relatively flexible base layer into a generally cylindrical spiral having an axis with the corrugations extending parallel to the axis of the cylindrical spiral and with the corrugations extending radially inwardly and engaging a top of the base layer to cause the base layer and the corrugations to cooperatively form the plurality of channels.
REFERENCES:
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patent: 3997645 (1976-12-01), Dempster
patent: 4268471 (1981-05-01), Breher
patent: 4426340 (1984-01-01), Coller et al.
patent: 4619112 (1986-10-01), Colgate
patent: 4650623 (1987-03-01), Berger
Purcell John R.
Sarwinski Raymond E.
CDC Partners
Nguyen Khanh P.
Rhodes, Jr. R. Gale
Woo Jay H.
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