مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

False Twister and its Effect on Yarn Quality

False Twister and its Effect on Yarn Quality
Mohammad Zarrebini, Azam Alirezazadeh, Gholamreza Afkhami, Ali Salehi
Abstract
 Despite of undesirable effects of roving machine on the quality of final yarn and also production costs, this operation cannot be omitted from the conventional yarn manufacturing process. This is because in order to produce good quality yarns, it is vital to process the roving in a drawing operation [1]. It is well known that, irregularity in roving leads to an increase in the level of faults in the final yarn. Yarn quality is affected by various parameters and devices such as false twister unit. Generally twist is inserted due to rotation of the flyer [2]. The amount of twist must not exceed certain value. To observe the amount of twist inserted photographs showing the insertion of twist were taken. These together with dynamic relationships were used to propose an optimum model for the false twister unit. During insertion of twist, the roving is subjected to forces and moments. In the proposed model, twist angle is calculated by evaluation of the above forces and moments. Furthermore, the effect of frictional properties of false twister can be optimized using different values of twist angle. By comparison of the data obtained using the mathematical relations, an indication of the frictional properties of flyer can be made. Results show that false twisters with long grooves not only increase twist value but also intensifies the irregularity of the roving. Twist value will be increased due to the enlargement of the angle between roving and vertical axis.
 Keywords: false twist, roving frame, roving, flyer.


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مدیر سایت سه‌شنبه 3 اردیبهشت‌ماه سال 1392 ساعت 01:57 ق.ظ
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