Sage Journals: Discover world-class research

Abstract

We have analyzed false-twist distribution in filaments along core yams produced on a friction spinning machine, considering the effective parameters for imparting twist to the filaments and yarns. The theoretical analysis is based on twist distribution along the conical yarn tail. Twist is applied to the yam tail by suction air pressure and rotation of the friction rollers. The theoretical results are compared with the experimental data. The results show that although, theoretically, the twist imparted to a filament is zero, there is still some twist in the filament in both directions (S and Z) in a short yarn length. As the sample length increases, these twists combine and cancel each other. The resulting twists tend toward zero in longer yam samples. Filament pre-tension also affects the false twist of the filament. The results show that the remaining twist in filaments in non-pre-tensioned yams is greater than that in pre-tensioned yams.

Get full access to this article

View all access options for this article.

References

Konda, F. , Okamura, M. , Merati, A.A. , and Youki. T. , Fiber Speed and Yarn Tension in Friction Spinning, Textile Res. J. 66, 343-348 (1996).

Konda, F. , Okamura, M. , and Merati, A.A. , Effect of Suction Air Pressure in Friction Spinning on Yarn Properties , Textile Res. J. 66, 446-452 (1996).

Konda, F. , Okamura, M. , Merati, A.A. , and Kato, H. , Simultaneous Measuring of Fiber Flow, Yarn Tension and Yarn Diameter in Friction Spinning. "Conference Proc., New Spinning Systems into the Future, Shanghai, China, Nov. 1995.

Lord, P.R. , Joo, C.W. , and Ashizaki. T. The Mechanics of Friction-Spinning, J. Textile Inst. (4), 234-254 (1987).

Lord, P.R. , and Rust, J.P. , Twist Distribution in Open-end Friction-spun Yarn. J. Textile Inst. 81 (2), 211 -213 (1990).

Merati, A.A. , Konda, F. , Okamura , M. , and Marui, M. , Filament Pre-Tension in Core Yarn Friction Spinning, Textile Res. J. (in press).

Merati, A.A. , Konda, F. , Okamura , M. , and Marui, M. Yarn Tension in the Yarn-Forming Zone of Friction Spinning. Textile Res. J. 67 (9), 643-653 (1997).

Miao, Menghe , and Chen, Renzhe , Yarn Twist Dynamics, Textile Res. J. 63 (3). 150- 158 (1993).

Shantong, Z. , A Theoretical Approach to the Fundamental Relationships in the Friction-Spinning Process, J. Textile Inst. 81 (1), 79 -85 ( 1990).

10.

Wei, M. , The Twisting Dynamic Analysis of Friction Spinning, Part 1, J. Textile Inst. 87 (3), 457-466 (1996).

False Twist in Core Yarn Friction Spinning

Abstract

Get full access to this article

References