Analysis on structure of two layered spun yarn by a helical path.

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  • Hua Dongping
    Department of Materials Science & Engineering Nagoya Institute of Technology
  • Harakawa Kazuhisa
    Department of Materials Science & Engineering Nagoya Institute of Technology
  • Kon Yuji
    Department of Materials Science & Engineering Nagoya Institute of Technology

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Other Title
  • 平均らせん長さによる２層糸の構造解析法
  • ヘイキンラ センナガサ ニ ヨル 2ソウシ ノ コウゾウ カイセキホウ

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Abstract

A method for analysing the structure of two layered spun yarn is proposed. In this method, structure variation is analyzed by using the cumulative curve of helical path differences (L (n)). L (n) contains two different kinds of components; one has relatively long wave length and the other has relatively short one. We consider that the former is 'trend' and that the latter shows the yarn structure change (migration) which is caused by variation of mutual dynamic balance of fibers.<BR>The variation component with relatively short wave length, named 'HPD', is, derived by removing 'trend' which is calculated by the 5th polynominal regression. Measurement is done about two layered yarns made of polyester staples of 2.0 denier 51 mm in length. Experimental results indicates that ΔHPD, which is the difference of HPD from the beginning of increase or decrease to the end of it, shows almost the same distribution with average 12.4μm, while the trend characterisfically shows the difference of the spinning direction.<BR>It is concluded experimentally that migration occurs when helical path difference becomes about 12.4μm, which is independent of spinnirig direction.

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