Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 63, Issue 6
Displaying 1-7 of 7 articles from this issue
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Commentation
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  • The Influence of Succinylation on Moisture Sorption of Wool Fibers
    Natsuko Kohara, Toshinari Nakajima, Naoko Yamaguchi
    2007 Volume 63 Issue 6 Pages 139-145
    Published: 2007
    Released on J-STAGE: August 01, 2007
    DOIhttps://doi.org/10.2115/fiber.63.139
    JOURNAL FREE ACCESS
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    Sorption isotherms of reduced and succinylated wool and then desalted completely or partially were obtained and the moisture sorption behaviors on these treated wools were compared with those on reduced and intact wools in order to clarify the influence of succinylation on the moisture sorption. COO.M+ group introduced into wool keratin by succinylation is more effective to improve the moisture sorpability than decrease of the crystallinity. OH and NH2 groups which are reaction sites in succinylation, contribute to the moisture sorption slightly more than COOH group. The sorption behaviors on these treated wools were explained by BET multilayer sorption theory combined with polymer solution theory.
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  • Effect of Microwave Heating on Dyeing
    Yurika Yoshimura, Takeru Ohe, Mitsuo Ueda, Tomoe Kurokawa, Haruo ...
    2007 Volume 63 Issue 6 Pages 146-151
    Published: 2007
    Released on J-STAGE: August 01, 2007
    DOIhttps://doi.org/10.2115/fiber.63.146
    JOURNAL FREE ACCESS
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    In order to apply the microwave technique to textile processing, the properties of heat generation of polar substances by microwave and the effects of microwave irradiation on dyeing were investigated. Microwave is absorbed by dipoles of the molecule of the substance, transforming their energy into heat. It was found that the apparent absorption efficiency increased with increasing the volume of the substance. The electrical field decreased exponentially in the substance, depending on the penetration depth. The ionic molecule absorbed microwave strongly, with increasing the concentration of the ions in the substance. The microwave absorption led to the change of the electric field in the substance, and the heterogeneous generation of the substance was occurred. The dye uptake on the fabric increased with increasing the microwave irradiated to the dye solution. With increasing the irradiation, the polar molecules of the dye staff and the fiber begin to absorb the microwave and generate heat in the vicinity region. This feat generation seems to give an effect on the absorption of the dye on the fiber.
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  • Formation Mechanism of Pores Contained in PVDF-based Carbon Films Derived through Chemical and High-temperature Heat-treatments
    Haruki Kobayashi, Masatoshi Shioya, Junya Yamashita, Toyonari Hira ...
    2007 Volume 63 Issue 6 Pages 152-158
    Published: 2007
    Released on J-STAGE: August 01, 2007
    DOIhttps://doi.org/10.2115/fiber.63.152
    JOURNAL FREE ACCESS
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    A mesoporous carbon can be derived from poly(vinylidene fluoride) (PVDF) via chemical dehydrofluorination (DHF), carbonization at high temperature and activation in carbon dioxide gas. The pore size of this activated carbon is determined by the pore size of the carbon before activation and controllable by adjusting the extent of DHF. The present study has aimed at elucidating the formation mechanism of pores in this carbon before activation. By comparing the porous structures of the carbon derived in this way and the carbon derived by applying the DHF treatment to a PVDF solution, it has been shown that the inhomogeneity in the extent of DHF between the amorphous and the crystalline regions of PVDF is the key factor of the formation of pores. It has been also demonstrated that this carbon before activation shows a selective absorption.
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Technical Papers
  • Evaluation of Kinetic Performance for Men's Suit Jacket in Exercise of Shoulder Joint
    Hiroyuki Kanai, Hajime Tsuji, Masayoshi Kamijo, Yo-ichi Matsumoto, ...
    2007 Volume 63 Issue 6 Pages 159-164
    Published: 2007
    Released on J-STAGE: August 01, 2007
    DOIhttps://doi.org/10.2115/fiber.63.159
    JOURNAL FREE ACCESS
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    This paper describes the kinetic performance evaluation of suit jacket by measurement of clothing pressure. Subjects wearing three suit jacket of different size performed three different exercises involving the rotation of the upper limbs. The clothing pressure was measured by the air-pack sensor and the partial compression feeling and the constrained feeling were evaluated by subjects. From the result, it was found that (1) the values of clothing pressure at the arm, the front of armhole and the scapula were correlated with the scores of compression feeling at same points, (2) the Weber-Fechner's law was applicable to the relation between the clothing pressure and the compressive feeling, and the clothing pressure values which gave subjects the low and the moderate compression feelings were 1.2kPa and 3.6 kPa, (3) the values of clothing pressure at the arm, the front and back of armhole and the scapula were correlated with the constrained feeling, and the clothing pressure measurement at these points was available to evaluate the kinetic performance of suit jacket.
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