METHOD FOR PRODUCING COATED REINFORCING THREADS MADE OF HIGH-PERFORMANCE FIBRES

摘要

The invention relates to a method for producing impregnated reinforcing threads made of high-performance fibres, especially glass fibres, carbon fibres and aramide fibres. The threads are impregnated in a polymer dip at a zerotwist or a producertwist of <= 120 twists/m. The impregnated threads are then drawn through a nozzle and are subsequently dried in a first heating zo ne in a superficial manner, however, are still kept damp in the nucleus. Said threads are then provided with a twist of up to 400 twists/m in a second heating zone and are fixed in said twist by additional heating. Reinforcing threads produced according to the inventive method are characterised by an intimate impregnation with polymers and thus by high stability under load an d fatigue strength under reversed bending stresses. Furthermore, the threads have a compact, constant cross-section over the length thereof. Such reinforcing threads are particularly useful for reinforcing driving belts an d high-pressure hoses. Woven and non-woven fabrics can be produced from said threads and can be used for reinforcing tyres, conveying belts and the like.