Patent ID: 8277590
Filing Date: 2012-10-02
Classification: B29C,B29D

Abstract:
1. A process for manufacturing a composite block of closed geometry, in the form of a continuous ring, based on reinforcing fibres and as a cross-linkable resin, by continuously winding in superposition a predetermined number Nc of layers of a tape of the reinforcing fibres embedded in a matrix based on a composition comprising the cross-linkable resin, the process comprising, from the upstream end downstream, the steps of: producing a rectilinear arrangement of reinforcing fibres, and conveying this arrangement in a feed direction; degassing the arrangement of fibres under the action of a vacuum; after degassing, impregnating said arrangement of fibres with the resin composition in the liquid state; passing the pre-preg thus obtained through a die to impose on said pre-preg the shape of a tape consisting of the reinforcing fibres in their liquid resin matrix, the thickness (denoted “Er”) of said tape being between 0.1 mm and 0.5 mm; on leaving the die, applying a surface treatment to the upper face of said tape in order to create a solid skin the thickness (denoted “Ep”) of which represents less than 10% of the thickness Er of the tape, so that said skin acts as a base for the subsequent winding of the tape on itself; and depositing the thus superficially treated tape on a support that dictates the final shape of the composite block, and winding said tape onto said support, in a single direction, by superposing the number Nc of layers in order directly to form the continuous ring on the support, Nc being less than 15.