Method and device for making a composite sheet with...

D - Textiles – Paper – 04 – H

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D04H 3/04 (2006.01) B29C 70/20 (2006.01) B29C 70/22 (2006.01) D04H 13/00 (2006.01)

Patent

CA 2450672

The invention concerns the manufacture of composite sheets with multiaxial fibrous reinforcement which consists in: forming a unidirectional layer of reinforcement yarns whereof at least 50 wt. % are commingled yarns consisting of intimately blended reinforcement filaments and filaments of an organic material; providing said layer with cohesion enabling it to be formed into a lap; lap-forming said layer on a moving support, in a direction transverse relative to the direction of displacement; heating the assembly of reinforcing yarns and organic material moving along the displacement direction and fixing it by the action of heat, optionally applying pressure, then cooling it to form a composite strip; and collecting said strip in the form of one or several composite sheets. The invention also concerns a device for implementing said method and the resulting products.

L'invention concerne la fabrication de plaques composites à renfort fibreux multiaxial qui consiste: - à former une nappe unidirectionnelle de fils de renfort dont au moins 50% en poids d'entre eux sont des fils co-mêlés constitués de filaments de renforcement et de filaments d'une matière organique intimement mélangés; - à conférer à ladite nappe une cohésion lui permettant d'être nappée; - à napper cette nappe sur un support en mouvement, dans une direction transversale par rapport à la direction du mouvement; - à chauffer l'ensemble fils de renfort-matière organique se déplaçant suivant la direction de mouvement et à le fixer par l'action de la chaleur, éventuellement en appliquant une pression, puis à le refroidir pour former une bande composite, et; à collecter ladite bande sous la forme d'une ou plusieurs plaques composites. La présente invention concerne également un dispositif de mise en oeuvre du procédé ainsi que les produits obtenus.

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