Study on interlaced yarn: part 4: yarn posture in interlacer, and relation between yarn positions and number of tangles

摘要

As a fundamental experiment to clarify the yam motion in an interlacer, the yarn posture was statistically analyzed from multiple photographs of yarns during an interlacing process taken with a still camera. The relation between the yam positionsin the interlacer and the number of tangles was also discussed. Results obtained are as follows.(1) The cross section of a yam passage was divided into six areas, and then, the yam positions within each area were examined in the yarn axial direction in order to analyze the yarn posture in the interlacer. This experiment revealed no noteworthycharacteristics of the yarn posture.(2) Yarns are located evenly on both sides of the air jet axis and traverse the air jet frequently at the supplied air pressure of 2~4 kgf/cm{sup}2. However, many opening and tangling parts are not produced because of the low air pressure supplied. On the contrary, yarns are located on one aide of the air jet axis and the frequency of traversing the air jet is low at the high supplied air pressure of 5~7 kgf/cm{sup}2. The reason for the small number of tangles at the low supplied air pressure is obviouslydifferent from that at the high supplied air pressure. Hence, taking into account changes not only in the supplied air pressure hut also in the yam motion makes it easier to understand variations in the number of tangles observed, which is maximized atthe supplied air pressure of 4.5 kgf/cm{sup}2.(3) Yarn positions become one-sided and frequency of traversing the air jet decreases as yarn speed increases. It is thought that the decrease in the frequency of traversing causes the number of tangles not to be simply in inverse proportion to the yarnspeed.(4) As the feed ratio increases, the resultant yarn tension decreases and the number of tangles decreases. This is because the yarn does not traverse the air jet frequently. For a small feed ratio the yarn is restricted to the central area of the yarnduct, and consequently, traverses the air jet frequently. However, many tangling parts are not produced owing to the high yarn tension produced. Hence, the number of tangles is maximized when the feed ratio is about 1%.