Abstract: A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

Abstract: A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

Abstract: A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

Abstract: A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

Abstract: Method and machine for producing multiaxial fibrous webs. A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

Abstract: A plurality of unidirectional sheets (30a, 30b, 30c) are superposed in different directions and they are bonded together. At least one of the unidirectional sheets is made by spreading a tow so as to obtain uniform thickness, width not less than 5 cm, and a weight of no more than 300 g/m2, cohesion being imparted to the sheet so as to enable it to be handled prior to being superposed with other sheets. Advantageously, the unidirectional sheets are made of carbon fibers and are obtained by spreading out large tows.

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.

Abstract: A woven fabric to be used in formation of a composite material includes multifilament warp and weft threads. Each of the warp threads and the weft threads have a total weight less than 80% of the weight of the fabric. The woven warp and weft threads have O twist/m and a torsion no greater than an original torsion of the threads before weaving. Each woven warp and weft thread has a width over the entire length thereof that is greater than or equal to an original width before weaving. The fabric is woven to have a given weight per unit area and a fiber volume ratio that is approximately constant throughout the fabric and that is satisfactory for use of the fabric in a composite material. The warp and weft threads of a yarn count that is greater than a yarn count traditionally used to achieve the fiber volume ratio for the given weight per unit area.

Abstract: A woven fabric to be used in formation of a composite material includes multifilament warp and weft threads. Each of the warp threads and the weft threads have a total weight less than 80% of the weight of the fabric. The woven warp and weft threads have 0 twist/m and a torsion no greater than an original torsion of the threads before weaving. Each woven warp and weft thread has a width over the entire length thereof that is greater than or equal to an original width before weaving. The fabric is woven to have a given weight per unit area and a fiber volume ratio that is approximately constant throughout the fabric and that is satisfactory for use of the fabric in a composite material. The warp and weft threads of a yarn count that is greater than a yarn count traditionally used to achieve the fiber volume ratio for the given weight per unit area.

Abstract: Textile reinforcing material useful for producing composite laminated articles by a general injection-molding technique, which is fabricated by arranging a stack of layers having textile reinforcements in a mold of a shape corresponding to that of the article to be fabricated and, after the mold has been closed, injecting a resin into it. At least one layer of the stack of textile reinforcements has a structure in which ducts extend in at least one direction therein to facilitate the flow of the resin during injection.

Abstract: A spiral-shaped textile structure comprises warp yarns (1-17) across which are passed successive rows of weft yarns (A-S), whereby the warp yarns (1-17) are essentially arranged in spirals having the same axis, so that the textile structure forms superimposed annular spirals centered on an axis (O). According to the invention, each weft yarn (A-S) extends between a warp yarn, known as a starting yarn, and another warp yarn, known as a reference yarn, according to a radius of one of the textile structure's turns. Each warp yarn (1-17) serves, in at least one annular region of the textile structure, as a reference yarn for at least one weft yarn (A-S), the reference yarns being distributed so at to obtain a uniform textile structure in the annular region.

Abstract: The invention relates to a textile structure comprising a superposition of unidirectional layers of yarns, the directions of which are crossed in relation to one another and which are tied by tying yarns. According to the invention, the number of superposed layers is at least equal to. The tying rate lies between 2 and 15%, approximately, and each tying yarn (20) ties at least one set of yarns of superposed layers, this set being defined by at least a first yarn (24) of a first layer (16) and at least a second yarn (25) of a second layer (19). The second yarn (25) is offset in relation to the first (24), and the connection of the layers is thus sufficiently loose in order to keep the structure in position and allow it to deform.

Abstract: Textile structure based on filaments impregnated and/or coated with thermoplastic material (FIT filaments) is formed from at least two layers of such FIT filaments, arranged perpendicularly to one another in the manner of a warp and a weft, but without being interlaced, and a binding weave consisting of a warp and a weft holding each of the FIT filaments in position. The textile structure is particularly applicable to the production of laminates exhibiting high mechanical stength.

Abstract: The present invention relates to a fiber-based, fire-resistant fabric comprising a mixture of:(a) about 50-90% by weight of textured fire-resistant fibers;(b) about 10-50% by weight of technical fibers of stiffness greater than that of textured glass, provided that if fibers (a) are fibers of textured glass, fibers (b) are not carbon fibers.The preferred textured fibers are glass fibers. Fibers (b) can be fibers of carbon, aramide or silicon carbide. The fabrics are useful for the manufacture of fire-resistant composite articles impregnated with phenolic resin.

Abstract: A fiber-based fabric having a high fire resistance, a low weight per unit area and a good mechanical strength, comprising a mixture of:(a) about 50-90% by weight of textured glass fibers,(b) about 10-50% by weight of carbon fibers.Said fabric is useful for the construction of articles for fitting out the interior of aircraft.

Abstract: The invention relates to a new complex filiform textile element comprising fibers of an inorganic material.The element in accordance with the invention is characterized by the fact that the fibers are contained on the outside by an enveloping but open structure of metal, the total area of the openings (So) being greater than the total area of the enveloping structure (Se) covering the apparent peripheral surface of all the entire fibers.