Processing device and method for performing single-yarn pre-twisting in Siro-spinning

Abstract

The invention relates to a processing device for performing single-yarn pre-twisting in Siro-spinning and a processing method for performing single-yarn pre-twisting in Siro-spinning and based on the processing device. The processing device and method has the advantages that two groups of friction rotation roller devices vertical to a sliver transfer direction are added between a twisting convergent point and a front roller front jaw so as to solve problems in the Siro-spinning; the device adds false twist to single-yarn slivers through rotation, two single yarn is allowed to have sufficient pre-twist before twisting and plying by utilizing twist transfer, and twisting is performed on surface hairiness; vertical fluctuation degree of yarn sections, not controlled by external force, between the convergent point and a twisting device is reduced evidently under the support effect of the two groups of friction rotation rollers, and the yarn evenness of the Siro-spinning is increased favorably.

Description

technical field [0001] The invention relates to a device for pre-false-twisting the single yarn sliver output by the front roller during the siro spinning process, so as to reduce the end-breakage rate, reduce yarn hairiness, improve yarn strength and expand the adaptability of processed products. Background technique [0002] Siro spinning is a spinning method that produces yarns with a strand-like structure on conventional ring spinning machines. After two rovings kept at a certain distance are drafted by the spinning frame, the two single yarn strands are output by the front roller, and the final yarn has a small amount of twist on the single yarn, similar to strands. Therefore, siro-spun yarns are used in many cases to replace ply yarn products. And compared with ply yarn, its production advantage lies in that it does not require parallel twisting, so the process flow is short, the production cycle can be greatly shortened, and production energy can be saved. [0003] ...

AI Technical Summary

Problems solved by technology

First of all, the siro-spun yarn is wound by two weakly twisted rovings as the center of each other. Although siro spinning has made great improvements in many aspects compared with similar conventional yarns, there is still a certain distance to truly achieve woolen single yarn weaving without sizing; In the process of converging from output port to twisting point, because the strands are in an uncontrolled state, the periodic jitter of the twisting balance makes the twist direction of the strands constantly change, and produces considerable changes; in addition, the strands The balanced twist depends on the balance between the torque of the strands above the convergence point and the torque in the yarn during twisting. Therefore, for the final product, the twist of the two single yarns that make up the product can be adjusted in a small range; finally, in Siro In the spinning process, the drafting state of a single roving is twice the count of the spun spun yarn, so the sliver between the nip of the front roller and the twisting point is prone to breakage

[0004] To sum up, it can be seen that the main problems existing in the process of spinning stranded yarn products in siro spinning are: 1. Compared with stranded yarn, there is still a gap in hairiness, twist size and stability of siro spun yarn; 2. The inherent characteristics of the siro spinning process cause the sliver to break easily before the twisting point converges

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