Model Experiment on Interlaced Yarn

Abstract

An attempt is carried out to make tangling and opening parts in a yarn without conventional interlacer, by running a track which carries the yarn fastened at its both ends and then by exposing the yarn to an air jet a moment. The action of the air jet on the yarn are discussed. Moreover, the effects of the air pressure, the nozzle height which means the distance between the air jet nozzle and the upper surface of track fastening yarn, the track .speed at which the yarn traverses the air jet, and the guide distance at which the yarn is fastened are analyzed. Results obtained are as follows. (1) The yarn subjected to the air jet in the experiment is similar to an interlaced yarn produced by means of a conventional interlacer. Hence, the interlacer is not essential to make tangling and opening parts in a yarn. The interlacer plays only a roll to control cyclic production of tangling and opening parts, and the action of the air jet makes them. (2) The opening part occurs at position where the air jet blows, and the tangling parts do at its both sides. (3) The interlaced yarn are not always made by the present method. Hence, repeating many experiments and introducing the probability of production of interlaced yarn make later analyses easy. As a result, in the experiment the probability increases with increasing the air pressure and is maximum at 4.5 kg/cm2. It rapidly decreases at the air pressure over that value. This tendency agrees well with the relation between the air pressure and the number of tangles of interlaced yarn shown in the previous paper. The interlaced yarn can not be produced under the condition that the air pressure is under 1.5 kg/cm2 or over 7.5 kg/cm2. The air pressure has few influence on the shape of tangling and opening parts. (4) Since the increase of the nozzle height corresponds to the decrease of the force due to the air jet, the probability and the diameter of the opening part reduce and the diameter of the tangling part increases. However, since the region exposed to the air jet acts, the length of the opening part radically increases. (5) In the limit of the experiment, the track speed at which the yarn traverses the air jet has very few effect. (6) The probability increases with increment of the guide distance, and takes the constant value of about 65% for the guide distance over 45 mm. The interlaced yarn does not occur for the guide distance under 20mm. The standard deviation of the length of opening part becomes large with increase of the guide distance.