Investigation of Effect of Roller Setting on Yarn Quality Properties in Draw Frame
In the scope of the study, it was aimed to determine the effect of the variation of the roller setting on the selected yarn properties in the first and second passage draw frame stages. For this purpose, two different draft distances were chosen for both passages and draw frame strip was produced. Then, these strips were made into yarn with constant production parameters. The hairiness, unevenness and strength properties of the yarns were tested with standard method. As a result, it was observed that increasing the draft distance affects negatively the selected three yarn properties. In this case, it has been determined that the shorter draft distance has more positive results in terms of yarn quality parameters for Şanlıurfa GAP cotton selected as the sample in the study.
Farklı İplik Tüylülüğü Test Cihazlarından Elde Edilen Sonuçların Karşılaştırılması
Bu calismada, esas olarak olcum sistemleri birbirinin benzeri olan Uster Tester 3, Uster Tester 4 ve Premier Pt 7000 cihazindan alinan tuyluluk test sonuclari ayri ayri karsilastirilarak, ayni iplik numunesine ait farkli cihaz sonuclari arasinda istatistiksel acidan anlamli fark olup olmadigi arastirilmistir. Calismada ozellikle UT4 ile Pt 7000'den alinan sonuclar arasinda fark olup olmadigi arastirilmistir. Ayrica ring ve OE-rotor ipliklerinin tuylulukleri, iplik isletmelerinde iplik tuylulugu testinde yaygin olarak kullanilan UT3, UT4, Pt 7000 ve Zweigle G 566 cihazlarinda test edilerek, soz konusu farkli test cihazlarindan elde edilen tuyluluk degerlerinin iplik numarasina bagli olarak degisim egilimi degerlendirilmistir. Elde edilen sonuclar degerlendirildiginde, ring ipliklerin UT4 ve Pt7000 test cihazlarindan alinan tuyluluk sonuclarinda ince ipliklerde (Ne 50-60) onemli fark olmamasina ragmen, orta incelikteki ipliklerde (Ne 20-30) tuyluluk degerinin Pt7000 cihazinda daha yuksek olarak olculdugu ve aradaki farkin istatistiksel acidan anlamli oldugu tespit edilmistir. OE-rotor ipliklerde ise Ne 12 numara iplige ait sonuclar haric incelenen UT4 ve Pt7000 tuyluluk sonuclari arasinda onemli bir fark gorulmemistir. Farkli cihazlardan alinan iplik tuylulugu sonuclarina ait egilimler degerlendirildiginde ise, penye triko, penye dokuma ve OE-rotor iplikleri icin dort cihazdan alinan sonuclarin beklenildigi gibi iplik inceldikce azalma egilimi gosterdigi, buna karsin penye dokuma iplikleri icin Zweigle G 566 cihazindan alinan sonuclarin tam tersi bir egilim gosterdigi belirlenmistir.
MEASURING THE HAIRINESS OF A ROTOR-SPUN YARN ON THE USTER TESTER 3 AT DIFFERENT SPEEDS
A low-twist rotor-spun yarn of 18.5 tex was tested for yarn hairiness and evenness on an Uster Tester 3 at speeds of 25, 100, and 400 m/min. Both spinning and rewound packages were tested. The results show that yarn hairiness measured at 25 and 100 m/min is lower than that obtained at 400 m/min, and the difference is statistically significant at the 5% level. This is true for both the original and rewound yarns. However, in contrast to the original yarn, the standard deviation of hairiness for the rewound yarn is significantly lower at 400 m/min than at 25 and 100 m/min. Test speed has little effect on the yarn-irregularity CV% for both the original and the rewound yarn, but the irregularity of the rewound yarn is consistently higher. The difference in yarn hairiness can be largely attributed to the frictional rubbing of the yarn surface by the yarn guides on the tester. The air flow generated during hairiness testing is also believed to play a part in the hairiness difference. Furthermore, it is shown th...