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AssigneeP-D Tec Fil GmbH Technische Filamente
InventorsJohannes Frenken, Horst-Dieter Rector
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An improved method for producing impregnated reinforcing threads is disclosed. The method involves impregnating glass, carbon or aramid fibers with a twist ≦120 turns/m with a polymer dip, drawing the impregnated threads through a nozzle, drying the threads superficially in a first heating zone where they are kept moist in the core, and then providing them with a twist up to 400 turns/m in a second heating zone in which they are heated to fix this twist. The fibers are intimately impregnated with polymer, so that the impregnated threads have high fatigue strength, and a compact, constant cross section throughout their length. The impregnated threads are particularly suitable for reinforcing driving belts and high pressure hoses; they can be made into wovens and scrims which, in turn, can be used for reinforcing tires, conveyor belts and the like.
A method of producing impregnated reinforcing threads made of glass, carbon or aramid fibers, characterized in that the fibers are impregnated in polymer dip with 0 twist or with a protective twist of ≦120 turns/m, in that the impregnated threads are then drawn through a nozzle, in that the impregnated threads after being drawn through the nozzle are dried superficially in a first heating zone, but left with a moist core, in that the superficially dried threads are subsequently provided with a twist or with an increased twist up to 400 turns/m and fixed at this twist by heating in a second heating zone, and in that the above method steps are carried out in one continuous run.
Dependencies are inferred from the claim text.