Chemical treatments for fibers and wire-coated composite...

B - Operations – Transporting – 29 – B

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Details

B29B 15/12 (2006.01) B29B 9/06 (2006.01) C03C 25/26 (2006.01) C03C 25/32 (2006.01)

Patent

CA 2262935

In one general aspect, the invention involves applying a chemical treatment to fibers (10), such as reinforcing fibers (12) suitable for making a composite article, so as to size and/or preimpregnate the fibers. The chemical treatment has a relatively low viscosity and is substantially solvent-free and non-radiation curable. Heat energy may be employed to lower the viscosity and improve the wetting ability of the applied treatment and/or to increase the molecular weight of, or otherwise cure, the treatment with essentially no generation of solvent vapor. The treated fibers (32) are used to form a composite strand (14), which may be subsequently processed in-line or off-line into a composite article having fibers disposed in a polymeric matrix. Another general aspect relates to encased composite strands, in thread or pellet form and to wire-coating methods and apparatus for making them. The strands are moldable into fiber-reinforced thermoplastic composite articles. Each strand is made from fibers, including reinforcing fibers and optionally fibers of a matrix material, that are impregnated with a chemical treatment so that the treatment is disposed between substantially all of the fibers.

Dans un premier aspect, cette invention consiste à appliquer un traitement chimique sur des fibres (10), telles que des fibres renforçatrices (12) conçues pour la fabrication d'un article composite, de manière à ensimer et/ou imprégner préalablement ces fibres. Ce traitement chimique présente une faible viscosité, est sensiblement dépourvu de solvant et peut se durcir sans être soumis à un rayonnement. On peut utiliser de l'énergie thermique pour abaisser la viscosité et améliorer la capacité de mouillage du traitement appliqué et/ou augmenter la masse moléculaire de celui-ci, ou encore son durcissement, essentiellement sans production de vapeur de solvant. On utilise les fibres traitées (32) pour former un fil de base composite (14), lequel peut être ultérieurement traité en continu ou en discontinu dans un article composite présentant des fibres disposées dans une matrice polymère. Dans un second aspect, cette invention concerne des fils de base composites encastrés, sous forme de fil ou de pastille, ainsi que des procédés d'enrobage de fils et des appareils de fabrication de ceux-ci. On peut mouler ces fils de base dans des articles composites thermoplastiques à fibres renforcées. On fabrique ces fils de base à l'aide de fibres, notamment de fibres renforçatrices et éventuellement de fibres d'un matériau matriciel, que l'on imprègne d'un traitement chimique, de façon que ce traitement soit placé essentiellement entre toutes les fibres.

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