Canoglu S., Yukseloglu S. M.; Hairiness Values of the Polyester/Viscose Ring-Spun Yarn Blends. FIBRES & TEXTILES in Eastern Europe 2008, Vol. 16, No. 4 (69) pp. 34-38. 34 n Introduction As it is well known, hairiness is one of the important parameters for spinners and for further processors in textiles; some researchers [1] indicated that for cotton yarns the statistical distribution of the number of protruding ends of different lengths is exponential. On the other hand, due to the hairiness in the yarn some de- faults on the fabric may be appeared. Warp drawer-in and warp yarn tangling during weaving process and hence warp yarn breakages, pilling on the knitted and woven fabrics and some defaults on the appearance of fabrics can be given as an example [2]. Hairiness has become one of the measurable yarn parameters from the beginning of 1950’s and since then is used regularly in yarn testing. Yarn hairiness does not only depend on a sin- gle parameter and is diffcult to be pre- vented [3]. Hairiness is defned as yarn protruding ends from the yarn body and the factors that affecting it are fber pa- rameters, processes of production, yarn and machine parameters etc. Some of the studies carried out previously [4, 5] have expressed that the cause of hairiness that are due to fber characteristics such as short fbers, long fbers, fber bridges, fber loops, loose fbers, vertical fbers etc. are due to the positioning within the yarn body itself were examined from the photographs by the scanning electron mi- croscope. The aim of the research work presented in the article was frstly to confrm the hairiness values, which are measured us- ing three different test methods, of the fve different blends of polyester/viscose ring-spun yarns when any results related to the fber of mixed blends are known from literature and secondly are or to indicate with same lengths of two differ- ent fbers of almost same linear densities which may cause various fber protrud- ing ends that may effect the percentage of yarn hairiness and hence its pilling value Hairiness Values of the Polyester/Viscose Ring-Spun Yarn Blends Suat Canoglu, S. Muge Yukseloglu Marmara University, Faculty of Technical Education, Department of Textile Education, Göztepe-34722, Istanbul, TURKEY E-mail: myukseloglu@marmara.edu.tr Abstract In this work, 0.133 - 0.166 tex and 38 mm of fber length of polyester and viscose rovings of 591 tex (α tex 8) were blended variously (polyester/viscose 35/65%; polyester/viscose 50/50%; polyester/viscose 65/35%; polyester 100% and viscose 100%) and the yarns were produced at spindle speed of 18000 rev/min with 48 mm of ring diameter and C type of traveller 50 mg (No.1/0) in ring frames. Later, the resulted 20 tex yarns were examined by measuring its tenacity, elongation, irregularity and hairiness. The aim of this study is to investigate the hairiness of ring-spun polyester/viscose blends, which are commonly used in the textile industry, by using three different test methods. The pilling values of these produced samples were also determined. The outcomes have been assessed according to the blend ratios and fber locations which were scanned on the scanning electron microscope; the observations were concluded both on the hairiness and pilling values depending on the blend proportions. As a result, within the produced yarns the worse hairiness was obtained on the viscose (100%) yarns and the worse pilling values were existed on the knitted fabrics which are formed from these spun yarns. Key words: polyester, viscose, blends, ring-spun yarn properties, hairiness, pilling. Table 3. Data of yarn processing. Machine Parameters Doubling Drafting tex input tex output α tex n spi , rpm Card 1 100 492,118 4,922 - - Drawframe I 8 9.3 4,922 4,219 - - Drawframe II 6 5.5 4,219 4,543 - - Rowing frame 1 7.6 4,543 591 8 1100 Ring frame 1 30 591 20 35.4 18,000 Table 1. Fiber properties. Fiber Fiber linear density, tex Fiber length, mm Polyester 0.166 38 Viscose 0.133 38 Table 2. Ring machine parameters. Parameters Values Spindle speed, rev/min 18000 Ring diameter, mm 48 Flange, mm 3.2 Traveller speed, m/s 45 Spool length, mm 210