Patent ID: 8585947
Filing Date: 2013-11-19
Classification: B29B,B29C,B29K,B29L,B60C,Y10T

Abstract:
1. A process for manufacturing a composite block of closed geometry, in the form of a continuous ring of monolithic structure, based on fibres and on a crosslinkable resin, by continuous winding and superposition of several layers of a tape of reinforcement fibres embedded in a matrix based on a composition comprising a crosslinkable resin, said process comprising, from upstream to downstream, the steps of: producing a rectilinear arrangement of reinforcement fibres and conveying this arrangement in a feed direction; degassing the arrangement of fibres by the action of a vacuum; after degassing, impregnating said arrangement of fibres under vacuum with said resin composition in the liquid state; passing the pre-preg thus obtained through a sizing die to make said pre-preg into the form of a tape composed of reinforcement fibres in their liquid resin matrix, the thickness of said tape being less than 0.5 mm; depositing the tape onto a support dictating the final shape of the composite block and winding said tape around said support, unidirectionally, by superposition of a predetermined number, denoted by “Nc”, of layers of said tape in order to directly form said continuous ring of monolithic structure on said support, Nc being less than 15; and once the continuous ring of monolithic structure has thus been formed, subjecting its liquid resin to an at least partial polymerization in order to stabilize said ring before removing it from its support, wherein a tensile stress experienced by the reinforcement fibres in the tape while running between the sizing die and the support is between 0.2 and 5 cN/tex.