Study on interlaced yarn. Part 4. Yarn posture in interlacer, and relation between yarn positions and number of tangles.:Part 4 : Yarn Posture in Interlacer, and Relation between Yarn Positions and Number of Tangles
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概要
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The yarn posture in an interlacer is investigated by using a still camera to take photographs of yarns on interlacing process and then by analyzing statistically yarn positions by a micro-computer as a fundamental experiment to clarify the yarn motion in the interlacer. The relations between the yarn positions in the interlacer and the number of tangles are also discussed. Results are as follows.<BR> (1) The cross section of yarn path is divided into 6 areas and the yarn positions within each area are examined in the yarn axial direction in order to analyze the yarn posture in the interlacer. As a result, the yarn posture has no distinctive feature in this experiment.<BR> (2) Yarns are located evenly on both sides of the air jet axis and traverse frequently the air jet at the air pressure ranging from 2 to 4 kg/cm<SUP>2</SUP>. However, many opening and tangling parts are not produced because of the low air pressure. Yarns are located on one side of the air jet axis and the frequency of yarn traverses is small at the high air pressure of 5 ∼ 7 kg/cm<SUP>2</SUP>. The reason of a small number of tangles at low air pressure is different from that at high air pressure. Hence, taking the change of not only the air pressure but also the yarn motion into account makes it easy to understand the variation of the number of tangles which takes the maximum value at the air pressure of 4.5 kg/cm<SUP>2</SUP>.<BR> (3) The yarn positions become one-sided and the frequency of traversing the air jet decreases as the yarn speed increases. It is considered that this decrease causes the number of tangles not to be simply in inverse proportion to the yarn speed.<BR> (4) As the feed ratio increases and the resultant yarn tension decreases, the number of tangles decreases since the yarn does not frequently traverse the air jet. In the case of the small feed ratio, the yarn is restricted in its movements near the center of the yarn path and consequently traverses the air jet very often. However, many tangling parts are not produced owing to the large yarn tension. Hence, the number of tangles is maximum when the feed ratio is about 1%.
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