Needle bonded complex

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 5/24 (2006.01) B32B 5/26 (2006.01) B32B 5/28 (2006.01) D04H 13/00 (2006.01)

Patent

CA 2695629

The invention relates to a process for preparation of a complex, which includes a) the production of a sheet associating in a juxtaposed manner at least one layer of a fibrous reinforcing structure and a layer of a thickening material that considerably thickens said sheet, b) the needle bonding of said sheet on the side of the fibrous reinforcing structure by means of barbed needles passing through at least said layer of a fibrous structure and at least partially through the layer of thickening material, the needles moving in the direction of the sheet at essentially the same speed as the sheet when they pass through it, with an impact density ranging from 1 to 25 impacts per cm2. The invention also relates to the complex and to the composite material obtained by impregnation of the complex. The invention makes faster impregnation of the complex possible during manufacture of the composite

L'invention concerne un procédé de préparation d'un complexe, qui comprend a) la production d'une feuille s'associant de manière juxtaposée à au moins une couche d'une structure de renfort fibreuse et une couche d'un matériau d'épaississement qui épaissit considérablement ladite feuille, b) la liaison par aiguille de ladite feuille du côté de la structure de renfort fibreuse au moyen d'aiguilles à barbes, traversant au moins ladite couche d'une structure fibreuse et au moins partiellement la couche de matériau d'épaississement, les aiguilles se déplaçant dans la direction de la feuille essentiellement à la même vitesse que la feuille lorsqu'elles la traversent, avec une densité d'impact allant de 1 à 25 impacts par cm2. L'invention concerne également un complexe et le matériau composite obtenu par imprégnation du complexe. L'invention permet une imprégnation du complexe plus rapide pendant la fabrication du composite.

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