Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1979-12-13
1981-11-03
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 467, 264 53, 264257, 521130, B29D 2704
Patent
active
042985560
ABSTRACT:
A fiber reinforcement is positioned on the female part of a matched die, and a reactive foaming mixture of polyol and isocyanate is placed on the reinforcement, the male part of the die set being then closed on the female part so as to compress the reinforcement and holding the die parts together while the mixture's foaming reaction occurs. So that the reinforcement can comprise finer than usual individual fiber thicknesses and be compressed more than usual by closing of the die while still filling all the voids between the fibers of the reinforcement with the foam produced by the mixture's reaction, from 5 to 30% by weight of a neutral ester having a boiling temperature higher than the foaming reaction temperature of the mixture, is initially added to the mixture before it is placed on the reinforcement and prior to closing of the die. This results in the foaming penetrating the voids between the fibers throughout the reinforcement between the mold parts more completely than is possible without using the ester.
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Brehm Michael
Rutsch Peter W.
Anderson Philip
Firma Carl Freudenberg
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