STUDIES ON THE WEAVING OPERATION

Abstract

The relation between the tension of warp yarn and the number of picks to the unit length is studied with a view to studying the operations of letting-off and taking-up by series of the experimental researches.Tension of warp yarn is measured by the momentary total warp tension measuring method by appling the strain-gauge, and following three weaving tests are studied to make an easy comparison with the theoretical researches.(a) With nylon filament (dia.=0.255mm) for warp yarn and brass wire (dia.=0.235mm) for weft yarn.The following formula is obtained; where T′: tension of warp yarn when the reed beats the cloth-fell T0: tension of warp yarn before the reed beats the cloth-fell D: number of picks to the unit length A2, A′2: constants(b) With brass wire (dia.=0.233mm) for warp yarn and brass yarn (dia.=0.254mm) for weft yarn. The results obtained are similar to the above (a).(c) With saran filament (360d) for warp yarn and saran filament (1, 000d) for weft yarn.It is found that the tendency of experimental result nearly coincides with the calculated result of the theoretical formula; where μ: Frictional coefficient between warp and weft yarn β: Shedding angle x: Interlacing angleThe increased tension of warp yarn owing to the beating, Tc=T′-T0, where T0 and D are the functional factors. This formula was applied in solving the operation of letting-off and taking-up, but as T0 changes with D no definite solution was obtainable.