Anisotropic reinforced ribbon-cast blanket for extended nip...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01) D03D 15/00 (2006.01) D06N 3/14 (2006.01) D06N 7/06 (2006.01)

Patent

CA 2212284

A conventional blanket material, preferably a woven fabric or scrim, is formed into a loop of the desired dimensions and impregnated and coated with a two-component urethane resin. As the urethane is applied to the woven substrate, short fibers are introduced into the urethane through a nozzle which aligns the fibers to run in the cross-machine direction. The fibers are introduced in sufficient quantities to provide significant structural reinforcement of the urethane in the cross-machine direction. The coated blanket is then ground to a desired constant thickness and an array of parallel grooves running in the machine direction are milled into the urethane coating. The anisotropic fiber reinforcement provides sufficient modulus to the urethane system to prevent the grooves from collapsing under the applied loads of the extended nip press. The reinforcing fibers may be glass, carbon fiber, synthetic polymer or other structural fiber material.

Cette invention concerne une toile classique, de préférence un tissu ou un canevas, en boucle sans fin de dimensions voulues et imprégnée et enduite d'une résine uréthanne deux composants. Durant l'application de l'uréthanne sur la toile, des fibres courtes sont injectées dans l'uréthanne au moyen d'une buse qui aligne les fibres en sens travers de la machine. Les fibres sont ajoutées en quantités suffisantes pour renforcer appréciablement l'uréthanne en sens travers de la machine. La toile ainsi revêtue est alors dressée à l'épaisseur voulue, puis le revêtement est soumis à un traitement de rainurage parallèle dans le sens machine. Le renfort de fibres anisotropique confère au revêtement d'uréthanne une résistance suffisante pour s'opposer à l'écrasement des rainures sous les charges subies au passage dans la pince de la presse. Les fibres de renfort peuvent être des fibres de verre, des fibres de carbone, des fibres polymères de synthèse ou des fibres de toute autre matière appropriée.

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