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HANGZHOU FENGYI TEXTILE CO.,LTD

Add:No.212 Yaqian Road, Yaqian Town, Xiaoshan, Hangzhou, China

Contact us:Doris Ding

Tel:+86-571-83717108

Fax:+86-571-83717108

Mob:+8618668232609

E-mail:dorisding81@fypolyester.com


High Twisted Yarn Sizing Process

HANGZHOU FENGYI TEXTILE CO.,LTD | Updated: Aug 11, 2017

               The hydrogen bonding between macromolecules in cotton fibers keeps its form, and in the process of spinning and twisting, the fiber form in the yarn is distorted, and the bonding and entanglement between the fibres can maintain the twisted state of the fiber to a certain extent. With the further increase of twist, the twisting state becomes more and more difficult to maintain, so the yarn has the tendency of the back twisting under the effect of the internal stress of the fiber twist. The yarn is relaxed and twisted at both ends of the grip, resulting in a twist-and-shrink kink.Twisted Yarn

               In order to prevent this twist-and-shrink phenomenon of yarn, the yarn should be hot-wet-shaped. Fiber in hot and wet processing due to the water lubrication, easy to make the combination of slow fiber, and heat energy will make hydrogen bond lively, break, breaking the original equilibrium state, in the new position after drying, cooling the molecular structure of the shape is fixed. The twisted state of the fiber in the yarn is maintained, and the twist and kink of the back twist disappears as the inside force weakens or disappears.Twisted Yarn

               The strong twist yarn enters the hot and humid environment again, the hydrogen bond break is active, the original balance is broken again, the fiber macromolecule absorbs the water to expand slack, and the twist and kink phenomenon occurs under the action of the twist internal stress. This kind of twist and kink phenomenon of the yarn, on the one hand, will produce the broken end in the dry split, seriously causing the whole warp to break, unable to drive normally, on the other hand, in weaving, causing the beheading or producing the warp cloth.

               The sizing process (1) increases the viscosity of the slurry appropriately, slows down the speed of swelling and relaxation of the strong twist yarn in the slurry tank, and controls the twist and contraction kink. Reduce the pressure grouting force, under the premise of ensuring a certain penetration, so that the yarn into the tin forest drying area, enhance the size of the yarn on the grip and control capacity, maintain its shape. (2) Increase the proportion of starch and propylene type slurry reasonably. Increase the softness of the film to prevent the loss of the serous membrane due to the difficulty of dry splitting, thus reducing the grip control ability of the yarn. (3) The appropriate increase in the unwinding tension. The yarn in the slurry to maintain a certain tension, while in the sizing process should pay attention to speed can not too fast. Zuk S432 type sizing machine through the axial unwinding tension * tension friction belt, slow down too fast through the axis under the action of inertia can not fall down in time, will cause the yarn relaxation to produce twist and contraction phenomenon. (4) The use of single slurry groove, double dip pressure, control the depth of immersion in the CM, to prevent the bottom of the slurry tank spray steam out of the yarn into wicker-like arrangement, resulting in entanglement and winding. (5) using single slurry groove to reduce the influence of external factors on yarn. With the production of double slurry trough, the distance of the original yarn on the shaft is too long, and the influence of the heat vapor, airflow and other factors in the process of sizing is easy.Twisted Yarn

HANGZHOU FENGYI TEXTILE CO.,LTD

Add:NO.212 YAQIAN ROAD,YAQIAN TOWN,XIAOSHAN,HANGZHOU,CHINA

Contact us:DORIS DING

Tel:+86-571-83717108

Fax:+86-571-83717108

Mob:+8618668232609

E-mail:dorisding81@fypolyester.com