Reinforcing material comprising volumized fibers and method...

B - Operations – Transporting – 29 – C

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B29C 44/12 (2006.01) B29C 70/02 (2006.01) B32B 5/18 (2006.01) B32B 5/26 (2006.01) D04H 1/00 (2006.01) D04H 3/02 (2006.01) D04H 3/10 (2006.01) D04H 13/00 (2006.01)

Patent

CA 2416915

The invention relates to a reinforcing material, constituted by volumized fibers that are combined in the form of a mat or a lay. The volumized fibers differ with respect to material or degree of volumization. Alternatively, or additionally, non-volumized fibers are used. The method for producing the inventive reinforcing material is characterized in that in a roving, yarn or weakly twisted yarn continuous monofilaments, arranged in parallel and having a high modulus of elasticity, are expanded with an aqueous binder-containing suspension of particles of the unexpanded precursor of the plastic hollow spheres with a particle size of 5 to 10 µm or spread apart and the interstices so formed are substantially filled with the particles. The material so obtained is subjected to the temperature required for the expansion of the precursor particles for the required duration and is further processed to a mat using differently expanded or unexpanded rovings, yarns or weakly twisted yarns and/or using rovings, yarns or weakly twisted yarns that consist of other materials. The reinforcing material is used for producing light laminates from duroplastic material that are especially strong as compared to known laminates.

L'invention concerne un matériau de renforcement constitué de fibres volumisées assemblées sous forme de natte ou de revêtement de sol. Les fibres volumisées diffèrent au niveau du matériau ou du degré de volumisation. Le matériau selon l'invention peut également faire intervenir des fibres non volumisées de manière alternative ou complémentaire. Le procédé de fabrication du matériau de renforcement selon l'invention consiste à écarter ou séparer les fils élémentaires de module d'élasticité élevé, disposés parallèlement dans un substrat de verre textile, un filé ou un fil légèrement retors, au moyen d'une suspension aqueuse contenant des agents liants de particules provenant de la phase antérieure non soufflée des sphères creuses plastiques de granulométrie comprise entre 5 et 10 µm. Les interstices formés sont remplis largement au moyen des particules et le matériau obtenu est exposé suffisamment longtemps à la température nécessaire au processus de soufflage des particules de la phase antérieure. Lesdits fils élémentaires sont ensuite traités de manière à obtenir une natte au moyen de substrats de verre textile, de filés ou de fils légèrement retors de rigidités différentes ou non soufflés, ou au moyen de substrats de verre textile, de filés ou de fils légèrement retors constitués de matériaux différents. Le matériau de renforcement selon l'invention sert à la fabrication de laminés légers en duroplastique. Les laminés légers fabriqués selon l'invention offrent une résistance supérieure aux laminés habituels.

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