Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Reexamination Certificate
2006-12-12
2006-12-12
Staicovici, Stefan (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
C264S102000, C264S257000, C264S258000, C264S511000, C264S324000
Reexamination Certificate
active
07147818
ABSTRACT:
A vacuum assisted resin transfer molding (VARTM) process wherein a preform, release film, distribution medium layer, resin inlet(s), vacuum outlet(s), and vacuum bag(s) are positioned on a mold. After the resin has fully impregnated the preform by a vacuum process, the resin feed source is closed and a vacuum crossover line is opened. The resin inlet(s) are then used as a vacuum source to continue the process of removal of the excess resin. Further, secondary vacuum outlets may be placed on the preform to aid in the removal of excess resin after resin impregnation. This imposes a uniform vacuum pressure across the preform to improve the structural characteristics such as the fiber volume fraction and the compaction of the wetted preform over the conventional VARTM process.
REFERENCES:
patent: 6270603 (2001-08-01), Westerman et al.
patent: 6558608 (2003-05-01), Haraldsson et al.
patent: 6586054 (2003-07-01), Walsh
patent: 2002/0020934 (2002-02-01), Hinz
patent: 2002/0022422 (2002-02-01), Waldrop, III et al.
Mulkern Thomas J.
Rigas Elias J.
Adams William V.
Miller Guy M.
Staicovici Stefan
Stolarun Edward L.
The United States of America as represented by the Secretary of
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