Method for improving filament cohesiveness of chopped aramid fiber
AssigneeTeijin Aramid B.V.
InventorsStephanus Willemsen, Hendrik Berend Olde
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Abstract
The invention pertains to a method for improving filament cohesiveness of chopped aramid fiber including the steps of impregnating a film-forming binding agent into the fiber, drying the fiber, optionally applying a finish to the fiber, and chopping the fiber to pieces of 1 to 16 mm length, characterized in that the fiber prior to applying the binding agent is subjected to a twisting process to obtain a fiber having a twisting level of 10 to 150 tpm and that the chopping of the fiber is performed in a rotary chopper.
Claims6
A method for improving filament cohesiveness of chopped aramid fiber comprising impregnating a water-soluble or water-dispersible film-forming binding agent selected from the group consisting of a polyurethane, a sulfonated polyester resin, and a mixture thereof, into the fiber, drying the fiber, optionally applying a finish to the fiber, and then chopping the fiber to pieces of 1 to 16 mm length, wherein the fiber prior to impregnating with the binding agent is subjected to a twisting process to obtain a fiber having a twisting level of 10 to 80 tpm (turns per meter) and the chopping of the fiber is performed in a rotary chopper, wherein the chopping of the fiber improves bulk density of the fiber.
Dependencies are inferred from the claim text.