ALTERNATE TWISTING BY INTERMITTENT AIR-VORTEX

Shimizu Jiro, Toriumi Koichiro, Kabeya Hisayoshi

doi:10.2115/fiber.32.11_t479

In the previous paper, it has been reported the twisting mechanism and the twist distributions caused by the air-jet false twister. In this paper it is shown that the filament yarn can be twisted by the new twister designed by using the air-jet false twister, in which the air can be supplied intermittently. Generally yarn twisting was thought to take place usually in the form of real twisting (especially in the case of spun yarn), however several new spinning methods (fasciated yarn by Du Pont., ST yarn by Repco Co. and etc.) have been developed recently to overcome the difficulty of speed limitation due to real yarn twisting. The apparatus in this paper can be used easily as one of the high speed methods for the twisting of fleece and the convergence of filaments. The twist distributions along the twisted yarn axis are discussed in the case of using one twister and two twisters, when the air was supplied in a form of step changes and intermittently. The results are as follows: 1) The twist distribution at the step input of the air is more variable at the time of start than at stoppage. 2) The intermittent supply of the air generates the alternate twists in the yarn, and the ratio of the lengths between the alternating points of the twist direction does not always agree with the ratio of the time of air supply to interruption. 3) The twist number of the alternate twist varies in accordance with the ON-OFF ratio of the supplied air. There exists an optimum ON-OFF ratio which generates the maximum twist. 4) In the plied yarn the twist appears more under the tensionless than under the tension of twisting process.

ALTERNATE TWISTING BY INTERMITTENT AIR-VORTEX

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