Journal of the Textile Machinery Society of Japan
Online ISSN : 1881-1159
Print ISSN : 0040-5043
Volume 34, Issue 3
Displaying 1-3 of 3 articles from this issue
  • Yo-ichi Matsumoto, Hidehiko Kyuma, Ikuo Tsuchiya
    1988 Volume 34 Issue 3 Pages 65-73
    Published: 1988
    Released on J-STAGE: October 24, 2006
    JOURNAL FREE ACCESS
    A theoretical calculation is made to simulate the effect of drafting upon the sliver irregularity in two-zone drafting of three-over-three roller system. Two types of slivers, i.e., random sliver and optional sliver are considered. The effects of sliver count, staple fiber length, fineness of fiber, draft distribution between two drafting zones, maximal moving distance and distribution type of speed changing point are calculated on a computer. Furthermore, we have a try for clarifying the relation between irregularity of the supplied sliver and irregularity due to the movement of speed changing point upon irregularity of sliver after drafting.
    The results are as follows:
    (1) When the maximal moving distance of speed changing point is 0, the number of fiber ends in every increment remains unchanged, but the sliver thickness is reduced by the drafting action. Therefore, the coefficient of variation in the drafted sliver increases by the square root of the draft ratio.
    (2) When the maximal moving distance of speed changing point is not 0, sliver irregularity vary with the increase in this distance. The increase ratio of sliver irregularity decreases with the increase of British count of sliver, fineness of fiber and staple fiber length. And the staple fiber length has the strongest influence on it. Furthermore, the coefficient of variation varies with the draft distribution and the moving condition of speed changing point on two drafting zones. It can be seen that there is an optimal draft distribution which makes the coefficient of variation minimum, and that the range of the first drafting ratio is about 1.5-3. When the distribution type of moving distance is the same one in each drafting zone, the difference between the maximal and the minimal value of coefficient of variation is the smallest one.
    (3) It is also found that the correlation between the irregularity of the supplied sliver and the irregularity due to the movement of speed changing point is almost always a negative value on each drafting. On the first drafting and the second drafting in which the moving distance of speed changing point is 0, those correlations are regarded as independent of each other because of the small value (Max. -0.2). However, on the second drafting in which the moving distance of speed changing point is not 0, the correlation is not regarded as independent because of the large value (Max. -0.7).
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  • Ryuzo Oinuma, Hiraku Takeda
    1988 Volume 34 Issue 3 Pages 74-78
    Published: 1988
    Released on J-STAGE: October 24, 2006
    JOURNAL FREE ACCESS
    The effects of some factors on the Spirality in plain jersey fabrics knitted of three-ply cotton yarns are investigated experimentally, and the following equation is derived statistically: PS(%)=(a√<l>+b)Sn+c/l+d where PS(%) is the percentage spirality in cotton plain jersey fabrics, Sn the number of snarls per yarn length of 25cm, l the loop length in mm, and a, b, c and d are constants. Let PS(%) and Sn be positive for the Z direction and negative for the S direction.
    The values of a and b are approximately constant and independent of the knitting machine speed and the method of the relaxation treatment used. On the other hand, the values of c and d are dependent on them. The values calculated from this equation agree well with the experimental values.
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  • Part 3: Men's Summer Suiting Fabrics
    A.E. Stearn, R.L. D'Arcy, R. Postle, T.J. Mahar
    1988 Volume 34 Issue 3 Pages 79-82
    Published: 1988
    Released on J-STAGE: October 24, 2006
    JOURNAL FREE ACCESS
    A Factor Analysis is presented of assessments of the handle of a range of 156 men's summer fabrics by a panel of 56 judges drawn from the textile and clothing industries of Japan, Australia, New Zealand, India, the United States and China and a panel of eight Australian consumer judges with no experience in these industries. The analysis has been extended to include KES-F data on the mechanical and physical properties of these fabrics. Expert judges of men's summer fabrics may be classified into two groups, according to their pattern of fabric handle assessment. One group constitutes the Japanese and some Chinese judges, and the other group is associated with “Western” judges. The difference between these two patterns of fabric handle assessment has been related to the mechanical properties of the fabrics.
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