Improvements in or relating to a process for the manufacture of after twisted yarns having at least 500 turns per metre

摘要

650,959. Spinning highly twisted yarns. NAAMLOOZE VENNOOTSCHAP HOLLANDSCHE KUNSTZIJDE INDUSTRIE. Dec. 29, 1947, No. 34492. Convention date, March 24. Drawings to Specification.- [Class 120(iii)] Highly twisted yarns having at least 500 turns per metre are after-twisted from. cross-wound bobbins rotated at a speed of at least 8,000 revolutions per minute, the bobbins having been wound with a traverse ratio greater than 5, determined by the formula K = c TL + d, where K is the traverse ratio evolved from the winding spindle speed in revolutions per minute and the number of complete traverse strokes per minute, T is the speed of the twisting spindle, L is the length of the yarn mass in centimetres and c and d are constants depending on the properties of the materials forming the yarns. For viscose rayon c as given 1/20,000 and d as L/10. Preferably, the weight of the yarn on thebobbin is not less than 500 grams.