Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 71, Issue 7
Journal of the Society of Fiber Science and Technology
Displaying 1-13 of 13 articles from this issue
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Reviews and News
Foreword
Special Issue on Institute Fiber Engineering Shinshu University
Review
Series of Fiber Basic Course Lectured by Professional Engineers-10
Serise of Historical Reviews of Japanese Textile Industry Supported by the Technology-History of the Production,Sales,and Product Development-22
Foreign News Letter
Original Articles
Transactions
  • Design of Girdles with Waist Support Function Considering Muscle Load, Autonomic Nerves, and Sensations
    Yuhi Murasaki, Harumi Morooka, Yoko Shinojima
    2015 Volume 71 Issue 7 Pages 217-223
    Published: July 10, 2015
    Released on J-STAGE: July 10, 2015
    DOIhttps://doi.org/10.2115/fiber.71.217
    JOURNAL FREE ACCESS
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    The purpose of this research was to develop guidelines for designing comfortable girdles with a waist support function, such as reducing the muscle load. We conducted the following experiments: (i) measuring the electrocardiogram (ECG) and electromyogram (EMG) when using low‐elastic spats with high‐elastic tape and (ii) evaluating the effects of three types of trial girdles based on the results of the first experiment. During the first experiment, we developed a taping method for reducing the muscle load and sympathetic activity (psychological stress). During the second experiment, it was found that the girdle types (A, B, and C) are effective at reducing the muscle load. In particular, the Type A girdle, which placed the hard elastic fabric on the back horizontally and surrounding the ilium, provided a less compressive feeling than the others. Finally, we objectively evaluated the emotion through brain wave analysis. The Type A girdle was found to be less irritating than the regular one on the market. The results of this research confirmed that the Type A design provides a comfortable girdle with a waist support function.
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  • A Novel Random Preferential Orientation of the Crystal A‐axis Along the Radial Direction Confirmed on the Poly‐p‐phenylenebenzobisoxazole (PBO) Fiber Made with a Water
    Tooru Kitagawa, Kohei Kiriyama, Yusuke Shimizu
    2015 Volume 71 Issue 7 Pages 224-231
    Published: July 10, 2015
    Released on J-STAGE: July 10, 2015
    DOIhttps://doi.org/10.2115/fiber.71.224
    JOURNAL FREE ACCESS
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    This article concerns PBO fiber structure, especially a preferential orientation of the a‐axis of the PBO crystal in the fiber. It has been reported that the a‐axis of the PBO crystal aligns parallel to the radial direction on the round cross section for PBO AS and HM fibers. This observation was proved by selected‐area electron diffraction and micro‐focus X‐ray diffraction. An application of water vapor coagulation is carried out in this study. It is proved that the fiber so made shows a random orientation of the PBO crystal a‐axis on the cross section. This fact has never been reported on any scientific or engineering journals before as far as the authors have concerned and it becomes state‐of‐the‐art in this study. A mechanism to explain the presence and/or absence of such preference is proposed. The authors believe that the presence of this radial preferential orientation comes from a combination or a balance of polymer‐solvent interaction and the direction of diffusion for solvent from the center to the outside of the fiber.
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Note
  • Effects of Laser Beam Width on the Diameter and Molecular Weight of Laser‐Electrospun Polylactide Fiber
    Midori Takasaki, Morie Kengo, Yutaka Ohkoshi, Toshihiro Hirai
    2015 Volume 71 Issue 7 Pages 232-235
    Published: July 10, 2015
    Released on J-STAGE: July 10, 2015
    DOIhttps://doi.org/10.2115/fiber.71.232
    JOURNAL FREE ACCESS
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    Effects of spinning conditions (laser beam width, applied voltage, and laser power) on reduction of molecular weight by thermal degradation, fiber diameter, and its evenness were investigated for the laser‐heated electrospinning process of polylactide fiber webs. Thinner fibers were obtained under the conditions of the narrower laser beam width, the lower applied voltage, and the higher laser power. Moreover, the thinner, the more uniform, and less degraded fiber can be obtained for the narrower beam width, while thermal degradation was inevitable for producing thinner fiber by varying applied voltage and laser power.
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