Patent ID: 9551094
Date: 2017-01-24
CPC Classifications: B29B,B29C,D03D,Y10T

Claim:
1. A fiber preform of π-shaped section, the preform comprising: a base with a first face and an opposite second face; legs extending from the second face; a fiber structure woven as a single piece by three-dimensional weaving with a plurality of layers of warp yarns interlinked by weft yarns in a plurality of layers of weft yarns, wherein in each weft plane of the fiber preform, the weft yarns of a first group of weft yarns extend continuously through the base between two opposite edges thereof, and weft yarns of a second group of weft yarns extend continuously from an end of one of the legs to an end of the other leg, passing via the base, each yarn of the second group crossing a plurality of yarns of the first group in only two distinct mutual crossing zones, each mutual crossing zone being located between two adjacent columns of warp yarns.