Process for manufacturing a layer of yarns, via stitches, in particular for the production of composite material parts

Abstract

A process for producing a layer of yarns grouped into rovings, via stitches, on a base, in particular for the production of composite material parts, by inclusion of the rovings in a matrix. The process includes carrying out the steps of depositing at least two rovings on the base, and stitching the at least two rovings thus deposited on the base with at least one stitch comprising two stitch holes.

1 - 6 . (canceled) 
     
     
         7 . A process for producing a layer of yarns grouped into rovings, via stitches, on a base for production of technical composite material parts, comprising carrying out the following steps:
 depositing at least two rovings on said base, and   stitching the at least two rovings thus deposited on the base, with at least one stitch comprising two stitch holes.   
     
     
         8 . The process for producing the layer of yarns grouped into rovings according to  claim 7 , wherein the stitches are aligned, each roving receiving a stitch hole on either side. 
     
     
         9 . The process for producing the layer of yarns grouped into rovings, according to  claim 8 , wherein the stitch holes are aligned. 
     
     
         10 . The process for producing the layer of yarns grouped into rovings, according to  claim 7 , wherein the stitching is slanted in a direction of the rovings. 
     
     
         11 . The process for producing the layer of yarns grouped into rovings, according to  claim 7 , wherein, when inverting, the rovings are placed alternately and lengths of the deposited rovings are identical. 
     
     
         12 . The process for producing the layer of yarns grouped into rovings, according to  claim 7 , wherein at least two of the at least two rovings are deposited superimposed over a length.