鞋硬度测试仪(鞋弯曲试验机)AF44gydF4y2Ba

2022年1月17日,gydF4y2Ba

纱线捻度的知识gydF4y2Ba

纱:纱和线程的通用术语。有很强的条幅,包括单纱和股。单纱:由短纤维处理,使短纤维或电线沿着轴向方向和扭曲。合股纱:它是由两个或两个以上的单纱和扭曲。其强度和耐磨性优于单纱。同时,合股纱也可以组合和扭曲以某种方式获得复合捻合股纱。捻线是什么?如果带的一端,另一端转动时,纱线就可以形成,称为扭曲。短纤维,扭曲的必要手段是使纤维纱条。通常需要浓缩的纤维成纤维带扭转之前,和外层纤维的纤维被挤压到内层。 Thereby, the strip is obtained in the longitudinal direction of the fibers. For long silk yarns and strands, twisted can form a tight structure that is not easily damaged by lateral force, and twisting can also form a variant wire and a fancy line. How many of the twisted and twisted direction not only affect the hand feel and appearance of the fabric, but also affect the intrinsic quality of the fabric. After the strip is twisted, the outer fibers produce a tilted helical roll back, the fiber torsional deformation, the gauze is tightly bored, and the structural form and mechanical physical properties of the fiber collective are changed. (As shown below) When there is an encirclement angle, the fiber has centripetal pressure on the yarn. The greater the encirclement angle, the greater the centripetal pressure. Due to the existence of centripetal pressure, the outer fiber is extruded to the inner layer, which increases the compactness of the yarn and the friction between the fibers, thus changing the structural form and physical and mechanical properties of the yarn, which is the essence of twisting yarn. Evaluation of yarn twist: Twist direction / twist / twist coefficient / twist shrinkage Twist direction: indicates the direction of twisting Twist direction refers to the inclined direction of the fiber in the single yarn or the single yarn in the strand after the yarn is twisted. It is divided into Z-twist and S-twist. After twisting, the twisting direction of yarn tends from the lower right corner to the upper left corner, and the inclined direction is consistent with the middle of "s", which is called s twisting or smooth twisting; The twist direction of yarn tends from the lower left corner to the upper right corner, and the tilt direction is consistent with the middle of "Z", which is called Z twist or backhand twist. Generally, Z-twist is used for single yarn and S-twist is used for ply yarn. The twist direction of the ply yarn is expressed according to the twist direction successively twisted. For example, the twist direction of single yarn with Z twist, initial twist with S twist and com...