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Yarn twisting

Palaniswamy K., Mohamed P.

Autex Research Journal

2005

Vol. 5, no. 2

87--90

The mechanism of twist insertion to the strand during ring spinning has been studied. The twisting of the strand occurs not only due to the rotation of twisting elements, but also due to the winding of yarn on the package. When the yarn is wound on a stationary cop by gripping and winding the yarn by hand, for every coil of yarn wind one turn of twist to the yarn is inserted. But the same yarn is over-end withdrawn from the cop, and all twists inserted during winding are removed during unwinding. Over-end unwinding rotates the yarn in the opposite direction. Since the yarn from the cop is over-end withdrawn during winding, the spindle speed is taken for calculating the twist in the yarn, whereas the flyer speed is taken for calculating twist in the roving due to the parallel unwinding of roving during spinning.

Influence of Ring Traveller Weight and Coating on Hairiness of Acrylic Yarns

Usta I., Canoğlu S.

Fibres & Textiles in Eastern Europe

2002

Vol. 8, no. 4 (39)

20--24

This study involves the results of an investigation concerning the influence of ring travellers of different weights, types and coatings on the hairiness of acrylic yarns spun from microfibres. 30 tex yarn was produced using C-type travellers with a twist factor of αtex=31.6. Travellers of 8 different weights and 4 different coatings were used working with two spindle speeds of 7000 rpm and 10,000 rpm. Yarn hairiness was evaluated with the use of a Shirley Yarn Hairiness Tester. The values of tension, breakage rate, count, twist, evenness, elongation and tensile strength of the yarn produced were measured. In addition the yarns were knitted into fabrics to observe and evaluate pilling. Some conclusions were drawn considering yarn hairiness.

Omówiono wyniki badań, dotyczących wpływu kilku typów biegaczy o różnej masie i pokryciu, na włochatość przędz akrylowych przędzionych z mikrowłókien. Produkowano, używając biegaczy typu C, włókno o masie liniowej 30 tex i współczynniku skrętu 31.6. Stosowano 8 typów biegaczy o różnych masach i 4 różnych pokryciach. Przędziono przy prędkości wrzecion 7.000 obr/min i 10.000 obr/min. Włochatość przędzy określano za pomocą przeznaczonego do tego celu aparatu firmy Shirley. Mierzono również wartości naprężeń, ilość zrywów, masę liniową, gładkość, wydłużenie i siłę zrywającą przędzę. Dodatkowo przędze przerabiano na dzianiny i oceniano na nich pilling. Wyciągnięto wnioski dotyczące powstawania włochatości.