Threading method and threading devices for disc-type friction twisters

A method of false-twist texturing of endless filament yarn which consists at least partly of thermoplastic manmade materials, wherein the yarn is textured in a false-twist texturing machine comprising disc-type twisters which consist of three disc sets which rotate in the same direction and which are arranged on three parallel shafts forming the corner points of an equilateral triangle and having fixed spacings in such a way that the discs overlap one another in the manner of spiral stairs and, in operation, the yarn travels through the twisters along a spiral three-dimensional curve, and wherein

• (a) the texturing machine and twisters operate at speeds which correspond to a texturing speed of from 700 to 1500 m/minute,
• (b) the feed yarn is run onto a waste take-up during the threading procedure,
• (c) the yarn is delivered in steps by only one disc of one shaft at a time into the region of the disc overlap,
• (d) the yarn is not subjected to the draft or overfeed required for texturing, determined by the different delivery and take-up speeds, till it is travelling through the twister along its spiral three-dimensional curve, and
• (e) the yarn is transferred from the waste device to the take-up tube on completion of the threading procedure.