False twist may be used as follows:
a) To produce effects, e.g. 1. the entanglement of fibres while false-twisted;
2. a measure of permanence to the twisted form by heat-setting the false-twisted yarns.
b) To assist processing, e.g. 1. the passage of sliver from "noble" comb to can;
2. the attenuation of rovings (q.v.) on a condenser ring frame