Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1973-03-09
1976-08-17
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264128, 264257, 264DIG53, 264DIG78, B29H 902
Patent
active
039754790
ABSTRACT:
A method of fabricating a reinforced plastic tubular article. A mandrel is positioned within a mold in spaced relation to the inner surface of the mold. Dry reinforcing material, in the form of fibrous or particulate material or a combination of both, is located in the annular space between the mandrel and the mold. The interior of the mold is evacuated to remove gas from the mold as well as from the voids within the reinforcing material. An uncured thermosetting resin system, which was mixed under vacuum conditions to remove gas from the system, is introduced into the mold. Pressure is applied to the resin to thoroughly impregnate the reinforcing material with the resin. The resin is then cured by heating while the pressure is maintained on the resin. The resulting cured product has a smooth outer surface which facilitates the attachment of coupling members and has improved mechanical properties. If a smooth outer surface is not desired, the fibrous material can be impregnated in an over sized mold or chamber, and after impregnation, transferred to a separate oven for curing.
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Balhoff T. E.
McClean Anderson, Inc.
White Robert F.
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