Method for spinning colorful slub or dotted yarn based on two-component two-stage drafting

Abstract

The invention discloses a method and device for weaving colorful bunchy yarn and dotted yarn based on two-component secondary traction. The device specifically comprises a traction and twisting system which comprises a primary traction unit on the front side and a secondary traction unit on the rear side. The primary traction unit comprises a combined rear roller and a middle roller. The secondary traction unit comprises a front roller and a middle roller. The two-component mixing proportion and yarn density dynamic change are controlled through primary asynchronous traction, and the datum line density or equivalent line density of yarn is controlled through secondary asynchronous traction. By means of the method and device, the changes of yarn density such as dot shape and bunchy shape of datum yarn can be accurately controlled, and the changes of yarn color such as dot color and bunchy color of datum yarn can be accurately controlled as well. Meanwhile, by controlling the middle rollers to rotate at a constant set speed, the reproducibility of pattern shape and color of yarn-density-variable yarn is ensured, and the weaving effect is more stable.

Description

technical field [0001] The invention relates to the field of spinning in textile engineering, in particular to a method and device for spinning multicolored slub yarns or dotted yarns based on two-component two-stage synchronous drafting. Background technique [0002] Yarn is an elongated fiber assembly formed by twisting fibers in parallel orientation. When the fibers are not evenly distributed in the length direction of the yarn, its linear density (or appearance) will increase a dynamic linear density (dynamic thickness) on the basis of the reference linear density (reference thickness), resulting in the yarn line Density (or thickness) changes. According to the size of this uneven distribution, it can be classified into slub yarn, dot yarn, etc., or collectively referred to as fancy yarn with linear density change. If the blending ratio can be changed while the linear density of the yarn is changed, fancy yarns with variable linear density and color can be formed. We d...

AI Technical Summary

Problems solved by technology

[0005] ① When two different raw materials (or different colors) of roving are used as the main and auxiliary yarn strands, the blending ratio (mixing color ratio) of the yarn cannot be randomly adjusted online;

[0007] ③ The reproducibility of the pattern is poor

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