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.
PAMUK İPLİKLERİNDE İPLİK TÜYLÜLÜĞÜ VE TÜYLÜLÜĞE ETKİ EDEN FAKTÖRLER (KAYNAK TARAMASI)
Son yillarda iplik tuylulugu; tuyluluk olcumundeki gelismeler sayesinde ve iplikten beklentilerin artmasi sonucu,onemli bir kalite parametresi halini almistir. Bu calismada; oncelikle iplik tuylulugunun onemi vurgulanmis dahasonra iplik tuylulugu tanimlanarak, % 100 pamuk ring ipliklerinde tuyluluge etki eden faktorler ayrintili birsekilde incelenmistir. Iplik tuylulugu; lif ozeliklerinden, iplik ozelliklerinden, egirme prosesindekiparametrelerden ve egirme prosesinden sonra gelen islemlerden etkilenmektedir. Iplik tuylulugune etki edenfaktorlerin coklugu sebebiyle, tuyluluk problemi tamamen cozulememektedir.
Modeling the Dynamic Behavior of the Fiber Bundle in a Roll-Drafting Process
Roll drafting is a mechanical operation that is indispensable when manufacturing staple yams. However, a fiber bundle throughout this operation has a certain number of defects in its regularity of linear density, causing many problems not only for the quality of the textile product but also for the efficiency of the manufacturing processes. In this research, we attempt to set up a mathematical model for the dynamic behavior of the flowing bundle on the basis of general physical laws. Mass balance and momentum balance are applied under certain assumptions. A constitutive model for relating the surface force and the deformation of the fiber bundle is introduced by considering a representative physical variable that stands for the characteristics of the bundle and its constituent fibers. A fundamental equation system can then be simplified in the steady state of the process, and the mathematical problem is reduced to such an extent that mathematical tools can solve the equations. From a simplified model, the simulation results are confirmed by the experiments. The results show that the mathematical model can be adjusted very easily to the experimental outcomes. The fiber bundle accelerates as the bundle attenuation pro ceeds. But near the front roll, the bundle of fibers might experience a jerk, because a discontinuity of the slope of the velocity profile could take place near the nip line of the front roll, which could cause irregularities in the linear density of the output sliver.