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Analysis of the Dimensionless Torque in Cone Drum False Twisting Mechanism  

Lee, Choon-Gil (Department of Textile and Fashion Technology, College of Engineering, Kyungil University)
Kang, Tae-Jin (School of Materials Science and Engineering, Seoul National University)
Publication Information
Fibers and Polymers / v.4, no.4, 2003 , pp. 161-168 More about this Journal
Abstract
An investigation of the dimensionless torque in the newly developed cone drum twister texturing mechanism is reported. The cone drum twister is one of the outer surface contacting friction-twisting devices in false-twist texturing. In this cone drum twister, a filament yam passes over the surface of the cone drum that rotates by the passing yarn without a special driving device. This research is composed of the theoretical analysis of the false twisting mechanism and the experimental analysis at room temperature. The equations have been derived which shows interrelationship of the conical angle of cone drum, the wrapping angle, the drag angle, and the yam helix angle. Theoretical values of dimensionless torque were calculated and were compared with the experimental results. It is shown that, as the conical angle and the projected wrapping angle increased, the dimensionless torque also increased. But the conical angle was reached to ${30.75}^{\circ}C$, the dimensionless torque decreased.
Keywords
Dimensionless torque; Relative velocity of friction surface; Drag angle; Cone drum twister; Outer surface contacting friction-twisting device; Conical angle; Projected wrapping angle;
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