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 Fabrics
InventorsBruno Bompard, Pierre Olry, Renaud Duval, Alain Bruyere, Dominique Coupe, Jean Aucagne
Life of this patent
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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.
Claims48
A method of making a multi-axial fiber sheet comprising the steps of superposing a plurality of unidirectional sheets in different directions and of bonding the superposed sheets together,
- wherein at least one said unidirectional sheets is made by spreading at least one tow so as to obtain a sheet of substantially uniform thickness, having a width of not less than 5 cm and a weight of not more than 300 g/m2, and by imparting a transverse cohesion to the unidirectional sheet enabling it to be handled prior to be superposed with at least one other unidirectional sheet.
Dependencies are inferred from the claim text.