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Volume 19, Issue 3
Displaying 1-3 of 3 articles from this issue
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Sei Uchiyama, Yoshiaki Miyagawa, Masahiro Kobayashi1973 Volume 19 Issue 3 Pages 57-63
Published: 1973
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSSpreading multifilament yarns into each mono filament by electro static method is studied.
The separation is performed while the yarn is passing through cylindrical electrodes charged at high voltage without touching them.
Several items concerning electrical separation of multifilaments are clarified as follows:
1) Separation of multifilaments takes place by repulsive force due to surface electric charge on each filament, the amount of which can be determined by the following theoretical equation σ=±2√<2T>/Ly1; ∫u1; 0; e-u2du where σ: surface charge density (e. s. u/cm) T: yarn tension (dyne) L: length of yarn (cm) y1; : maximum spreading width of a yarn when charged (cm) y0; : Width of a yarn when not charged (cm) u1; ;=√<logy0; /y1; >
2) There is a critical relative humidity which gives the maximum electric charge onto yarn.
A new effective method to make multifilament yarns separate is devised which uses a pair of electrodes having different polarity to get intensive electric field.
In this apparatus, an additional voltage onto multifilaments yarn is much lower than in the single electrode method.View full abstractDownload PDF (734K) -
Tsuneyo Tsuboi, Koji Nihira, Toshihiro Gunji1973 Volume 19 Issue 3 Pages 64-73
Published: 1973
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThis paper discusses the optical properties of the so-called Tamamushi Fabrics (iridescent fabrics) measured with a goniophotometer.
The results obtained are:
(1) The factors governing the optical properties of Tamamushi fabrics are considered to be the surface structure of the fabrics, fabric construction, gloss and combination of the colors of warp ends and filling yarns.
(2) In order to analyse their optical properties, the reflected light from Tamamushi fabrics should be separated into the specular and the diffuse components.
(3) The optical properties of warp ends and filling yarns have an important bearing on the iridescence of Tamamushi fabrics.
(4) The color change of Tamamushi fabrics should be discussed from the goniophotometric reflection curves obtained under a monochromatic light resembling the warp ends and filling yarns in color.
(5) The larger the hue difference between the warp ends and filling yarns, the larger the change of color on the chromatic diagram.View full abstractDownload PDF (1262K) -
Michikazu Tanaka, Takao Wachi1973 Volume 19 Issue 3 Pages 74-81
Published: 1973
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThis paper seeks the computerized solution for laying out the garment pieces in the most efficient manner. This technique is hitherto dependent on the feeling and experience of the marker making expert, taking much time and producing many cut wastes. The authors discuss the algorithm on the arrangement of garment pieces under the fundamental rules for arranging them. Using this algorithm the programmed scheme is developed on FACOM 270 20/30 (65K) XY plotter. Some examples of this algorithm shows it commercially competitive with the present industry practice.View full abstractDownload PDF (820K)
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