Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1975-05-22
1976-10-26
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 50, 264 53, 264 407, 264 54, 264328, 264DIG5, 264DIG14, 264DIG83, 428320, 428409, B29D 2700, B29F 106
Patent
active
039884031
ABSTRACT:
A process is disclosed for producing a structural foam article having a surface that reproducibly and faithfully replicates the surface of the mold within which the article was made. The process is an improvement in the "low pressure" process for producing structural foam, wherein the improvement resides in introducing the molten mixture of foamable thermoplastic material and blowing agent into the mold under such conditions that a no-slip boundary condition is maintained at an interface between the flowing thermoplastic and a predetermined portion of the interior surface of the mold, and by maintaining the temperature at said interface at or above a certain temperature (termed "replication temperature"), while the thermoplastic is flowing in the mold.
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Anderson Robert J.
Angell, Jr. Richard G.
Hobbs Kenneth E.
James David E.
Marsh B. Duane
Anderson Philip
Metz Charles J.
Union Carbide Corporation
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