Mechanical Analysis of Garabo and Related Experiments.

Abstract

In Gara-bo spinning, relations among spinning conditions and structural parameters of yarn are very complicated and have not been formulated. when the spinning is in a steady state, some formulae were derived about a relation among the yarn thickness D, the twist rate A, the established yarn tension T and the fiber density pp. Namely, where, CuA, Cm and CdA are coefficients without relation to T and pp.Moreover, based upon the essential principle of Gara-bo, a device was developed for the precise measurement by using electronic technology. Through some experiments done with the device, it is ascertained that Cu, Cm and CdA can be almost considered as a constant and the theoretical formulae can be used with sufficient suitability.Therefore, when the yarn thickness deviated from the hoped value in spinning process, the compensation quantity of the established tension, which modifies the deviation, can be decided by the formulae.

Developing a Twist Draft Spinning System for Small-Scale Production of Special Material Yarns

“…First, we studied the throstle-spinning machine [6,7], a kind of twist draft spinning, since this machine has some desirable properties: simplicity of the pretreatment process and ability to process extremely small lots and lowspinnability materials. We are now developing a new spinning system based on the throstle-spinning machine, tension control twist draft spinning (TCTDS) (Figure 1 ), which improves yarn productivity [3,5].…”

Yarn Property Control on a Twist Drafting Frame1

“…The relation permits control of the linear density and twist rate of the yarn independently to a certain extent and systematically, which is impossible with conventional twist drafting. I Twist drafting [3][4][5][6][7]9] produces a yarn directly from a large mass of material fibers, without dealing with some se i-manufactures such as sliver and roving, by using th twist of the yarn to supply the nip force to select fibers from the mass. Twist drafting has some desirable properties for small-scale production of various functional yarns: ability to process extremely small lots, high adaptability to low spinnability materials, simplicity of the pretreatment process, and low frame-making costs due to the simple frame mechanism [7,9].…”