Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 68, Issue 1
Displaying 1-20 of 20 articles from this issue
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  • Electrochemical Performance of Polyvinyl Alcohol Nano-fiber based Nonwoven Separator for Lithium ion Battery
    Masanao Tanaka, Tae-Hyung Cho, Tatsuo Nakamura, Takashi Tarao, Masaaki ...
    2012 Volume 68 Issue 1 Pages 1-5
    Published: January 10, 2012
    Released on J-STAGE: February 10, 2012
    DOIhttps://doi.org/10.2115/fiber.68.1
    JOURNAL FREE ACCESS
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    Micro porous nonwoven as separator for lithium ion battery has been developed using electrospun polyvinyl alcohol (PVA) nano-fibers with diameter of around 250 nm. The PVA nonwoven showed higher porosity, lower Gurley value and better wettability in an electrolyte solution than polyolefin micro porous membrane separator. The nonwoven was electrochemically stable in the voltage range of 3 to 4.5 V vs. Li+/Li on a cyclic voltammetry measurement. In spite of its high porosity and low Gurley value, any internal short circuit was not observed for cell using it during charge-discharge test. The cell also showed better cycle stability and rate capability than that using a polyolefin one, which could be attributed to low Gurley value, high porosity and better wettability of the PVA nonwoven.
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Technical Papers
  • Development of Non-Contact Measuring Method for Final Twist Number of Double Ply Staple Yarn
    Keizo Koganeya, Youichi Yukishita, Hirotaka Fujisaki, Yasunori Jintoku ...
    2012 Volume 68 Issue 1 Pages 6-10
    Published: January 10, 2012
    Released on J-STAGE: February 10, 2012
    DOIhttps://doi.org/10.2115/fiber.68.6
    JOURNAL FREE ACCESS
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    The twist of yarn is one of its important properties. The amount of twist inserted in a yarn is a factor on which are dependent, not only tensile strength, but also a number of properties which contribute to yarn quality. The common method for testing final twist, an attribute of double-ply yarn generally used with flat knitting machines, consists of untwisting the yarn. We propose a method for extracting an outer profile from an image of yarn which is scanned by running the yarn in front of a CCD camera. The number of peaks in the outer profile is related to the number of final twists in the yarn. The number of final twists can be estimated by calculating their frequency in the outer profile using FFT. This paper shows the results of this new method, compared with those of the ordinary method of untwisting yarn.
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Notes
  • Development of Heating Fabrics by Printing Graphite Powder
    Koki Onda, Tetsuro Yamada, Shota Sumi, Yoshiro Noguchi, Yutaka Suzuki, ...
    2012 Volume 68 Issue 1 Pages 11-13
    Published: January 10, 2012
    Released on J-STAGE: February 10, 2012
    DOIhttps://doi.org/10.2115/fiber.68.11
    JOURNAL FREE ACCESS
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    Flexible heating elements have been developed by printing graphite powder on the fabrics using commercial binders. Tensile properties for the fabric were almost unchanged when the treatment was applied to the fabric made of nylon or polyester filament yarns. On the one hand the cotton fabric lowered its flexibility. The surface temperature of the heating element made of polyester could be raised over than 40 oC from room temperature. Polyester fabric seems to be one of the most suitable materials for producing flexible heating elements.
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  • Effects of the Treatments with the Peptides Extracted from Human Hairs on the Physical Properties of Bleached Human Hairs
    Shingo Washika, Noboru Yoshii, Sayaka Fukuta, Shoko Nishiyama, Sayaka ...
    2012 Volume 68 Issue 1 Pages 14-17
    Published: January 10, 2012
    Released on J-STAGE: February 10, 2012
    DOIhttps://doi.org/10.2115/fiber.68.14
    JOURNAL FREE ACCESS
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    Two types of peptide fractions were extracted from the human hairs and the properties for the fractions were investigated. The molecular weight of A fractions was 11 kDa, and that of B fractions 9.7 kDa. Artificially damaged human hairs were prepared by repeating the bleach treatments, and the recoveries in physical properties for the damaged hairs were estimated by impregnating those extracted peptide fractions. When the A fractions were impregnated into the damaged hairs, the formation of permanent waves was slightly recovered. As for the B fractions the tensile strengths for the damaged hairs were regained to some extent.
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