Relation between Tangling Strength and Structure of Interlaced Yarns.

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  • インターレース糸の交絡強度と構造の関係
  • インターレースイト ノ コウラク キョウド ト コウゾウ ノ カンケイ

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Abstract

Tangling strengths represent the preservation characteristic of tangling parts of interlaced yarns subjected to force. The number of tangles, tangling angle, lengths of tangling and non-tangling parts, yarn diameter and so on are structural characteristics of interlaced yarns. They are important characteristics of interlaced yarns. However, the relation between tangling strengths and structures has not been clarified yet. In this study, for the purpose of evaluating and controlling interlaced yarns, we discussed the two followings : the effects of interlacing factors (supplied air pressures, yarn speeds and feed ratios) on the tangling strength, and the relation between the tangling strength and the structure. Results obtained are as follows.<BR> (1) When the supplied air pressure is high, an air force acting on a yarn is great. When the yarn speed is low, a time for which an air jet acts on a yarn of a unit length is long. When the feed ratio is large, a great amount of filaments is fed to tangling production. Hence, these cases give large tangling strengths to interlaced yarns.<BR> (2) Modified tangling angles are defined by tangling angles divided by dimensionless cross-sectional areas of tangling parts (ratios of average apparent cross-sectional areas of tangling parts to average apparent crosssectional areas of raw yarns). Then, the tangling strength has a linear relation to the modified tangling angle, in one-to-one correspondence independent of processing factors (supplied air pressures, yarn speeds and feed ratios). The tangling strength increases with the modified tangling angle. This is because filaments in tangling parts are long for large tangling angles, tangling is strong for small apparent cross-sectional areas of tangling parts, and frictional force between filaments is large for large yarn counts with wide contact areas.<BR> (3) It was suggested that the tangling strength can be evaluated, on an on-line real time system because both tangling angles and dimensionless cross-sectional areas of tangling parts can be measured on an on-line real time system.

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