Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1985-05-20
1987-01-27
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 54, 264158, 264321, 264DIG14, 425395, 425408, 425817R, C08J 934, C08J 902, B29C 4300, B29C 6722
Patent
active
046393439
ABSTRACT:
A method of re-shaping polyimide and modified polyimide foam sheets into selected shapes. Polyimide foam sheets can be made by any of a number of methods, some of which produce sheets of selected thicknesses directly and others of which produce blocks or buns of foam which are sliced into sheets. A sheet is placed in a mold having the desired configuration, such as a half-pipe. The sheet is compressed to about 0 to 99% of the original thickness with heating of one or both major surfaces of the sheet to a temperature of from about 250.degree. to 320.degree. C. for about 0.5 to 5 minutes. Upon removal from the mold, the polyimide foam is found to be self-supporting and to have taken on the mold shape. A moisture impervious densified skin is found on the heated side(s).
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Gagliani John
Long John V.
Anderson Philip
Gilliam Frank D.
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