Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1997-01-21
2000-01-25
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
156286, 264102, 264257, 264258, 264571, B29C 7046
Patent
active
060174846
ABSTRACT:
A process and associated apparatus used to prepare a thermoplastic composite from a plurality of plies of thermoplastic resin prepregs. The prepregs are formed into a composite structure under two chambers; a rigid outer chamber (of any convenient size or shape) and a second flexible inner chamber containing a prepreg lay-up. The absolute pressures are reduced concurrently in a stepwise method in both chambers. This concurrent, stepped pressure reduction is accomplished at a rate which prevents the vacuum bag from moving far from the prepregs, and prevents wrinkles from forming in the prepregs. Pinching off the diffusion paths required for the removal of unwanted gases is eliminated. The lay-up is then heated and the absolute pressure in the outer rigid chamber is increased. This pressure constrains the flexible inner chamber during out-gassing of the thermoplastic resin, preventing wrinkles from forming in the prepregs. The absolute pressure in the outer rigid chamber is increased to atmospheric pressure or greater causing the prepregs to consolidate. A low absolute pressure is maintained in the flexible inner chamber. The temperature is then increased to the cure temperature of the resin and held for a time sufficient for the resin to cure. The resulting consolidated thermoplastic resin is substantially void free and detectable wrinkles are absent.
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Hale Harold P.
Vargot Mathieu D.
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