Effects of Fingth and Finenss on the Formation of Yarn Structure.

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  • Hua Dongping
    Department of Materials Science & Engineering, Nagoya Institute of Technology. Gokiso-cho, Showa-ku, Nagoya
  • Harakawa Kazuhisa
    Department of Materials Science & Engineering, Nagoya Institute of Technology. Gokiso-cho, Showa-ku, Nagoya
  • Kon Yuji
    Department of Materials Science & Engineering, Nagoya Institute of Technology. Gokiso-cho, Showa-ku, Nagoya

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  • 糸の構造形成に対する繊維長および繊度の効果
  • イト ノ コウゾウ ケイセイ ニ タイスル センイチョウ オヨビ センド ノ

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The effects of fiber dimensions on the yarn structure formation have been investigated by using polyester fibers which differ in length (35mm, 51 mm) and/or in fineness (1 .5D, 2.0D). The effects of coupling and arrangement of the different fibers have been also investigated. The structure analysing method with two layered spun yarn applied to this investigation, is based on HPD (Helical Path Difference) defined as the accumulation of differences between the helical paths of the each fibers which the yarn consists of. When HPD is monotonically increasing or decreasing in an interval, it is considered that the yarn structure formation has been in the same process and that the increment or decrement of HPD in the interval ζ, which is called ΔHPD, is the critical value inducing fiber migration.<BR>Following results have been observed experimentally.<BR>1) The two layered yarn which consists of finer and/or shorter fibers, shows larger ΔHPD, index-μ it and ζ.<BR>2) The LHPD of the yarn consisting of different fibers shows approximately mean value of ΔHPDs observed at the yarns consisting of each original fibers only.<BR>3) The coupling of different fibers causes some tendency of index-μ : the shorter and/or the coarsers tend to appear in the outer.<BR>4) The tendency of index-μ depending on the spinning direction is promoted or restrained according to the way of arrangement of the different fibers.

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