Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 68, Issue 4
Displaying 1-12 of 12 articles from this issue
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  • Curing Kinetics of Lignin-based Epoxy Resins
    Yuki Hasegawa, Kazuhiro Shikinaka, Shinya Kajita, Eiji Masai, Yoshihir ...
    2012 Volume 68 Issue 4 Pages 73-78
    Published: 2012
    Released on J-STAGE: June 25, 2012
    DOIhttps://doi.org/10.2115/fiber.68.73
    JOURNAL FREE ACCESS
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    Curing kinetics of an epoxy resin containing 2-pyrone-4,6-dicarboxylic acid (PDC) nuclei which is obtained from lignin biodegradation intermediates was studied. Activation energy of the resin was estimated according to Kissinger and Ozawa methods. From Kamal equation, reaction constants and reaction rates were calculated. These constants were approximately coincident to those estimated from the results of in situ FT-IR measurement.
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  • Improving Adhesion between Fiber and Coating Material
    Hangjin Cho, Isao Tabata, Kenji Hisada, Kazumasa Hirogaki, Teruo Hori
    2012 Volume 68 Issue 4 Pages 79-87
    Published: 2012
    Released on J-STAGE: June 25, 2012
    DOIhttps://doi.org/10.2115/fiber.68.79
    JOURNAL FREE ACCESS
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    The supercritical fluid method was used to copper-plate poly(ethylene terephthalate) fibers. First, selected Pd-complexes were impregnated into the fibers and free Pd metal was decomposed in the fibers by heat reduction. Using precipitated Pd, electroless copper plating was successfully performed. Poly(ethylene terephthalate) fibers having different shapes of cross section were investigated to improve the adhesion property of the copper plated on the fibers. The fibers having peanut shape of cross section had higher conductive properties than the other fibers having triangle or circular cross section, even after abrasion and washing tests. To improve adhesion between fiber and plated metal much more, an attempt has been done to change surface modification of fiber by UV or plasma. The copper plated fibers after treating surface modifications had higher conductivity than the non-treated fiber. Better adhesion property was obtained by these pretreatments.
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  • Sol/gel Pretreatment of Various Fabrics for Electroless Plating
    Mitsuru Mizuno, Tsutomu Takagi, Kazumasa Hirogaki, Teruo Hori
    2012 Volume 68 Issue 4 Pages 88-92
    Published: 2012
    Released on J-STAGE: June 25, 2012
    DOIhttps://doi.org/10.2115/fiber.68.88
    JOURNAL FREE ACCESS
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    3-aminopropyl triethoxysilane was hydrolyzed in water or water and ethanol mixture for several hours to produce its trihydroxysilane (silanol) derivative. This silanol derivative was then fixed on the surfaces of cotton, vinylon, and oxygen-plasma-pretreated PP and PET fabrics by pad-cure method. The fixation of hydrolyzed APS on the fabrics was confirmed by XPS analysis. APS-fixed fabrics were easily metalized by usual electroless cupper plating. The amount of plated cupper and the electric resistivity of the Cu-plated fabrics were measured. The electric resistivity in the cases of the Cu-plated PP and PET fabrics was kept even after washing.
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  • Super High Water-Repellent Treatments of Various Kinds of Cloths Using Sol/Gel Method
    Mitsuru Mizuno, Yuri Chaya, Tsutomu Takagi, Kazumasa Hirogaki, Teruo H ...
    2012 Volume 68 Issue 4 Pages 93-97
    Published: 2012
    Released on J-STAGE: June 25, 2012
    DOIhttps://doi.org/10.2115/fiber.68.93
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    Using mixtures of two kinds of silane compounds, tetraethoxysilane and triethoxy-1H,1H,2H,2H- tridecafluoro-n-octylsilane (commercial name : Fluowet FS600, Clariant Co., Ltd. ), super high water-repellent treatments were investigated on several kinds of fabrics. First, the mixtures with different mixing ratio were adjusted to pH 4.0 by adding acetic acid and they were aged for several hours under agitation to be proceeded condensation reaction of silane compounds. Then, the fabrics were immersed in such prepared silane mixtures. The excess of the mixtures on the fabrics were removed and then the fabrics were heated to 150°C to fix the silane compounds on the fabrics surface. The reaction of silane compounds were confirmed using FT-IR and EDX analysis. Very high contact angle of water droplet was observed even after enough washing.
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Technical Paper
  • Instrument for Measuring the Appearance Width of Running Double Ply Staple Yarn Using Lightness Threshold for Yarn Image
    Keizo Koganeya, Youichi Yukishita, Hirotaka Fujisaki, Yasutaka Jintoku ...
    2012 Volume 68 Issue 4 Pages 98-105
    Published: 2012
    Released on J-STAGE: June 25, 2012
    DOIhttps://doi.org/10.2115/fiber.68.98
    JOURNAL FREE ACCESS
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    The yarn thickness has been defined in the relationship between length and weight of the yarn. However, the appearance width (diameter) of the yarn plays an important role in the dimension of knit wear products. In addition, the appearance width is related with final twist number and affects yarn properties. In this study, a measuring instrument of the appearance width of running double ply staple yarn with yarn tension control is developed. The image of the yarn can be obtained with a CCD camera and a flat type LED panel with brightness control. A method to exploit a certain threshold to divide the core and fluff in the image of the running double ply staple yarn is introduced. Experimental results show the validness of the obtaining appearance width.
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