Method for making fibrous preforms for producing annular parts from a composite material
First Claim
1. A method of making fiber preforms for manufacturing annular parts made of composite material, the method comprising:
- providing a strip of spirally- or helically-shaped cloth having substantially helical warp yarns and substantially radial weft yarns, the mass per unit area of the warp of the helical cloth increasing from an inside diameter to an outside diameter an increase in mass per unit area of the warp at least approximately compensating, in terms of density per unit volume of the preform, a decrease in density of the weft from the inside diameter to the outside diameter;
winding superposed layers of the strip of spirally- or helically-shaped cloth; and
needling the layers of the strip of cloth to bond the layers together by fibers pulled from the yarns of the cloth.
7 Assignments
0 Petitions
Accused Products
Abstract
Fiber preforms for use in the manufacture of composite material annular ps are made by winding superposed layers of a strip of cloth (10) of spiral or helical shape comprising substantially helical warp threads and substantially radial weft threads. The mass per unit area of the warp of the helical cloth increases between its inside diameter and its outside diameter, and the layers of the strip of cloth are needled so as to be bonded together by fibers pulled from the yarn of the cloth, the increase in mass per unit area of the warp at least approximately compensating, in terms of density per unit volume of the preform, the decrease in density of the weft between the inside diameter and the outside diameter.
82 Citations
29 Claims
-
1. A method of making fiber preforms for manufacturing annular parts made of composite material, the method comprising:
-
providing a strip of spirally- or helically-shaped cloth having substantially helical warp yarns and substantially radial weft yarns, the mass per unit area of the warp of the helical cloth increasing from an inside diameter to an outside diameter an increase in mass per unit area of the warp at least approximately compensating, in terms of density per unit volume of the preform, a decrease in density of the weft from the inside diameter to the outside diameter; winding superposed layers of the strip of spirally- or helically-shaped cloth; and needling the layers of the strip of cloth to bond the layers together by fibers pulled from the yarns of the cloth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
Specification