Patent ID: 6179943
Filing Date: 2001-01-30
Classification: B29C,Y10T

Abstract:
A method of forming an acoustic panel comprising:applying a perforated composite sheet on a convex lay-up mandrel;applying a core to the perforated composite sheet;curing the perforated composite sheet and the core so as to form a perforated acoustic core having a perforated side and a core side, the perforated acoustic core having first residual stresses formed therein during curing;applying a second composite sheet on a concave lay-up mandrel;arranging the perforated acoustic core over the second composite sheet with the core side against the second composite sheet so as to form a composite part; andcuring the composite part to form an acoustic panel whereby second residual stresses are formed within the second composite sheet during curing, the second residual stresses being substantially opposite the first residual stresses so that a substantially stable acoustic panel is formed.