Patent ID: 6875297
Filing Date: 2005-04-05
Classification: B29C,H05K,Y10T

Abstract:
1. A process for manufacturing composite parts of given thickness, comprising reinforcement fibers which are parallel to at least one preferred direction of reinforcement, said fibers being embedded in a matrix based on a composition comprising a resin which can be hardened by ionizing irradiation, the process comprising: arranging said reinforcement fibers substantially parallel to one plane and impregnating them with said composition; exposing the composition containing said fibers, in a layer of thickness less than said given thickness, to ionizing irradiation, in order partially to polymerize the resin and to obtain a precomposite in which said composition is in a solid phase, the exposure to ionizing irradiation being stopped once an index D constituted by the Shore D hardness of the precomposite divided by the Shore D hardness of the final composite has reached a value of the order of 0.5 and before said index D has reached a value of the order of 0.7; taking lengths from the precomposite and applying said lengths to a support, the surface of which is non-planar in shape, by stacking said lengths on one another in a number dictated by said given thickness, and by causing said lengths to fit snugly against said shape of the support, and thus to create a stack of stressed lengths; and subjecting said stack of stressed lengths to final molding at a suitable pressure and temperature to continue the polymerization of the resin and to join said lengths of the precomposite.