False twister yarn feed tube - has structured air jets to carry yarn along long tubes with low friction

摘要

The tube assembly to feed and lay a yarn at the heater of a false twister appts., has compressed air jets aligned on a secant to a tangent with one direction component directed along the tube feed direction. One air stream within the tube rotates in a spiral. ADVANTAGE - The yarn is advanced along the whole length of the tube, and not just at the entry section, preventing the development of major friction forces so that the tube can be very long with a strong curvature.