The relevance of false-twist addition on ring spun yarns by means of rotary threaded surfaces. Issue 11 (June 2022)

• Record Type: Journal Article
• Authors: Xu, Duo; Gao, Chong; Fan, Hang; Yang, Wangwang; Fang, Jian; Liu, Keshuai; Xu, Weilin
• Is Part Of: Textile research journal. Volume 92:Issue 11/12(2022)
• Page Start: 1796
• Page End: 1806
• Publication Date: 2022-06
• Subjects: Threaded contact surface -- false twist -- cyclical stress fluctuation -- hair wrapping -- original spinning -- yarn property; Textile industry -- Periodicals; Textile fabrics -- Periodicals; Textile research -- Periodicals; Textiles et tissus -- Industrie et commerce -- Périodiques; Textiles et tissus -- Périodiques; Textiles et tissus -- Recherche -- Périodiques; Electronic journals; 677.005
• DOI: 10.1177/00405175211063908
• Languages: English
• ISSNs: 0040-5175

Abstract

A novel concept of producing false-twist yarns by cyclical stress fluctuation was developed. The forming principle was introduced to analyze the formation process of false twists on rotary threaded contact surfaces. Geometric analysis indicates that cyclical stress variations produce extra rotations (false twists) on fiber strands in the yarn formation area, causing twist redistribution and fiber arrangement remodeling with the appearance of local fiber reversion. Theoretical analysis reveals that more false twists are produced when the spun yarn is in contact with surfaces of high traverse speeds. Then, a motion simulation model using different traverse speeds of the threaded contact surface was established to compare the yarn internal stress variation, verifying the false-twist efficiency at different traverse speeds. Finally, a systematic comparison was conducted between the yarns spun at different traverse speeds. It was shown that the yarn properties improved with higher traverse speeds of the threaded contact surface, achieving less hairiness, high yarn strength, and low residual torque.