Model Experiment on Interlaced Yarn

Abstract

We clarify the effects of various process factors on the number of tangles and the yarn tension using an equipment by which a yarn can be intermittently exposed to air jets. Process characteristics of this equipment are discussed. Results obtained are as follows. (1) The increase of the air pressure in this experiment corresponds to only the increase of the force due to the air jet. Hence, the number of tangles increases monotonously with the air pressure. For the comparatively large air pressure, the degree of increase of the number of tangles is small and the number of tangles approaches a constant asymptotically. The yarn tension shows the same tendency as the number of tangles. (2) When the rotation radius is 60mm, against the yarn speed (the disk rotation number) the number of tangles takes a constant for the frequency of air jet blowings of 20/m. For the frequencies of air jet blowings of 50 and 80/m, the number of tangles decreases linearly with the increase of the yarn speed. This reason is that the period of air jet blowing becomes short due to the increase of the air jet nozzle speed. When the rotation radius is 30mm, the number of tangles stays constant for every frequency of air jet blowings. The yarn tension indicates the same tendency as the number of tangles. (3) The number of tangles takes the maximum against the feed ratio, which is the same tendency as the result of a conventional interlacer. The feed ratio at which the number of tangles becomes maximum is 1% for every frequency of air jet blowings. The yarn tension decreases with the feed ratio and shows the different behaviour from the number of tangles. (4) The increase of the nozzle height corresponds to the decrease of the force due to the air jet and to the increase of the extent where a yarn is subjected to the air jet. Consequently, the number of tangles monotonously decreases with the nozzle height. The yarn tension stays almost constant. (5) The number of tangles shows the maximum against the nozzle diameter. The nozzle diameter at which the number of tangles is maximum depends upon the frequency of air jet blowings. The smaller the frequency of air jet blowings, the larger this value. The yarn tension shows a monotonous increase with the nozzle diameter, which is the different tendency from the number of tangles. (6) Against the increase of the frequency of air jet blowings, the number of tangles linearly increases when the frequency of air jet blowings is less than 2030/m When the frequency of air jet blowings is more than this value, the number of tangles is not so high as the expected value because of the mutual interference of effects of air jets on the yarn The yarn tension increases less than 30/m of the frequency of air jet blowings and is constant at the further value of the frequency of air jet blowings (7) The maximum number of tangles obtained by the use of the present equipment is 77/m at the air pressure of 4kg/cm2 A comparison with the result of a conventional mterlacer makes it clear that the present equipment is certainly put to practical use.