Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1990-03-22
1992-11-03
Dawson, Robert A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 51, 264DIG13, B29C 6722
Patent
active
051606747
ABSTRACT:
A method for producing microcellular foam from a semi-crystalline polymeric material. The material is heated to its melting point at an elevated pressure and then saturated with a uniform concentration of a gas. The pressure is then lowered causing bubble nucleation and growth within the material. The material is then quenched to prevent further foaming. Bubbles on the order of 5 .mu.m in diameter are produced with a bubble density of approximately 10.sup.10 bubbles/cm.sup.3.
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Brydson, J. A. Plastics Materials, Princeton, N.J., D. Van Nostrand, .COPYRGT.1966, pp. 296-305; 341-349.
Colton Jonathan S.
Suh Nam P.
Dawson Robert A.
Kuhns Allan R.
Massachusetts Institute of Technology
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