A pultruded part reinforced by longitudinal and transverse...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 70/22 (2006.01) B29D 99/00 (2010.01) B29C 70/06 (2006.01) B29C 70/20 (2006.01) B29C 70/52 (2006.01)

Patent

CA 2485531

A method for forming a pultruded part includes collating reinforcing fibers by providing a first layer of reinforcing rovings extending in the longitudinal pultrusion direction, applying onto the first layer an intermediate layer of reinforcing fibers at least some of which include at least portions thereof which extend in the transverse direction and covering the intermediate layer with a second layer of rovings extending in the longitudinal direction. To the collated fibers is applied a resin so as to permeate through the layers and the materials are passed through a die to set the resin. The first and second layers are arranged to form first and second opposed surfaces of the part with the intermediate layer therebetween. The resin is a two part urethane resin which has sufficient strength to prevent the fibers from the first and second layers at the first and second surfaces respectively from breaking through the surface on bending of the wall thus allowing the use of the rovings at the surfaces with the transverse fibers therebetween so that the transverse fibers can be formed from loose or chopped fiber material from rovings rather than more expensive mat.

L'invention concerne une méthode de fabrication d'une pièce pultrudée qui consiste à regrouper des fibres de renforcement au moyen d'une première couche de mèches discontinues de renforcement à pultrusion longitudinale et à appliquer, sur la première couche, une couche intermédiaire de fibres de renforcement, dont au moins un certain nombre s'étendent en direction transversale et couvrent la couche intermédiaire d'une deuxième couche de mèches discontinues en sens longitudinal. On applique aux fibres regroupées une résine qui imprègne les couches, et les matériaux passent à travers une matrice pour durcir la résine. La première et la deuxième couches sont disposées de manière à former une première et une deuxième surfaces opposées de la pièce, la couche intermédiaire y étant intercalée. La résine est constituée d'uréthane à deux parties qui est assez rigide pour empêcher la rupture des fibres de la première et de la deuxième couches sur la première et la deuxième surfaces respectivement lorsque la paroi est pliée, permettant ainsi l'utilisation de mèches discontinues intercalées de fibres transversales, de sorte qu'on puisse obtenir des fibres transversales à partir de fibres lâches ou coupées des mèches discontinues, au lieu d'utiliser un matériau plus dispendieux.

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