Patent ID: 7862679
Filing Date: 2011-01-04
Classification: B29C,B29K,Y10T

Abstract:
1. A method of forming a composite part from an uncured layup, comprising the steps of: (A) forming an inner bag comprising a flexible sheet; (B) forming an outer bag comprising a flexible sheet; (C) attaching the inner bag to the outer bag to form a double bag assembly, both of said inner and outer bags comprising opposing faces attached immediately adjacent to one another including over a central region of said inner and outer bags; (D) placing the bag assembly over a tool holding the composite part; (E) sealing each of the bags comprising the bag assembly to the tool, said sealing comprising forming an inner seal between the inner bag and the tool, and forming an outer seal between the outer bag and the tool; and, (F) drawing a vacuum in the inner and outer bags, said vacuum causing compaction pressure to be transferred by said bags to said composite part.