Patent ID: 9114574
Filing Date: 2015-08-25
Classification: B29C,B29D,B29L,Y02T

Abstract:
1. A process for the production of a stiffened panel made of composite material that comprises a panel that consists of fibers that are woven in a resin matrix, one of the surfaces of the panel being connected to at least one stiffener made of composite material in the form of a section whose cross-section comprises a non-flat central part with caps on either side in contact with the panel in an assembled state, said central part being separated from said panel to be reinforced, the process comprising: depositing the fibers that constitute the panel on a rigid device; depositing said at least one stiffener by inserting a core between each stiffener and the panel; covering a unit comprising at least the panel, the at least one stiffener and the core with a sealed wall connected to the rigid device on the periphery of the panel; and polymerizing the unit by subjecting the unit to pressure, wherein each stiffener is provided with a counter-mold that is rigid in contact with the convex surface of the stiffener, lateral edges of the rigid counter-mold not extending beyond lateral edges of the at least one stiffener, the core in the form of a flexible and sealed bladder is used with each stiffener, the interior of said bladder is subjected to gas pressure during polymerization for compacting the stiffener and the panel, and for each stiffener, the bladder has at least one protruding end at the level of the protruding end of the stiffener to communicate with an outside environment of a chamber formed by at least the panel, the counter-mold, and the bladder to obtain an identical pressure in the bladder and in the outside environment of the chamber.