Method and machine for producing multiaxial fibrous webs
AssigneesSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A.", Hexcel Reinforcements
InventorsBruno Bompard, Pierre Olry, Renaud Duval, Alain Bruyere, Dominique Coupe, Jean Aucagne
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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.
Claims24
A fibrous unidirectional sheet showing transverse cohesion and constituted by juxtaposed unidirectional strips obtained from spreaded tows having at least 12 K filaments per tow, the sheet weighing not more than 300 g/m2 and being of width of not less than 5 cm.
Dependencies are inferred from the claim text.