Importance

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Abstract

The invention pertains to a method for producing heavy-duty yarn prepregs of glass fibers or aramide fibers or carbon fibers, wherein the fibers are soaked in a PTFE dispersion, subsequently conveyed through a nozzle and simultaneously pressure-impregnated, and wherein the air that is still situated between the individual filaments of the fibers is pressed out and the individual filaments are completely encased with PTFE and then dried. The objective of the invention consists of achieving an additional increase in the strength of the yarns, in particular, in the resistance to abrasion, with a method of this type. The invention proposes that the narrowest cross section of the nozzle is 15-170% greater than the sum of the cross sections of the individual yarn filaments, and that the PTFE used for encasing the individual filaments is sintered out before the yarn is rolled up. An outlet attachment may be advantageously connected to the outlet end of the nozzle, wherein this outlet attachment forms a linear extension of the nozzle outlet end in the form of a guide channel, the profile of which corresponds to that of the nozzle outlet end.

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First Claim