Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 63, Issue 10
Displaying 1-15 of 15 articles from this issue
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Column
Feature
Reports
Report from Research Committee
Prize for New Fiber Technology
Transactions
  • Near-Infrared Green Camouflage of PET Fabrics Using Disperse Dyes
    Zhang Hui, Zhang Jianchun
    2007Volume 63Issue 10 Pages 223-229
    Published: 2007
    Released on J-STAGE: November 15, 2007
    DOIhttps://doi.org/10.2115/fiber.63.223
    JOURNAL FREE ACCESS
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    In order to match the reflectance profile of greenish leaf at NIR region, four commercially disperse dyes were used to dye PET fabric, and the reflectance of dyed fabric and the transmittance of dye liquor in alcohol solution were measured by using a UV-Vis-NIR spectrometer with an integrating sphere. The effect of the combination dyeing, dyeing concentration (% owf) and fabric weave on the reflectance were also studied. The results show that the reflectance of the combination dyeing is determined by one of the dyes whose reflectance curve emerges at longer wavelengths. C.I. Disperse Blue 56 plays an important role in green camouflaging. When the dyeing concentration of C.I. Disperse Blue 56 is 1 - 2% owf, the reflectance of dyed fabric almost overlaps that of greenish leaf in red shift region (region A). Fabric weave has little effect on the reflectance for the same dyeing program.
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  • Structural Study on Electrospun Nanofibers of Polydioxanone
    Atsushi Nakayama, Yutaka Kawahara, Yoshitaka Hayakawa, Ryosuke Tak ...
    2007Volume 63Issue 10 Pages 230-234
    Published: 2007
    Released on J-STAGE: November 15, 2007
    DOIhttps://doi.org/10.2115/fiber.63.230
    JOURNAL FREE ACCESS
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    Nanofibers of polydioxanone (PPDX) were electrospun from 3.0-wt% solution in 1,1,1,3,3,3-hexafluoro-2- propanol. Structure and morphology of the electrospun nanofibers were investigated by transmission electron microscopy (TEM). In order to align and collect nanofibers parallel to each other, we used a homemade collector with separated electrodes which was specially designed. TEM revealed that thus aligned nanofibers on the collector are partially crystallized. The SAED patterns of nanofibers, which were drawn and/or heat-treated with being deposited on the collector, showed a well-developed fiber pattern. In the dark-field image of heat-treated nanofibers, many striations which are running perpendicular to the fiber axis were observed. These striations appear to be a part of stacked-lamellar structure oriented in the direction of fiber axis. This result indicated that heat-treated PPDX nanofibers have stackedlamellar structure.
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  • Properties of Partially Extracted Hairs and their Degradability by Proteases
    Chikara Yamauchi, Wataru Okazaki, Tadashi Yoshida, Aya Karasawa, K ...
    2007Volume 63Issue 10 Pages 235-240
    Published: 2007
    Released on J-STAGE: November 15, 2007
    DOIhttps://doi.org/10.2115/fiber.63.235
    JOURNAL FREE ACCESS
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    Protease degradation of the major components in human hair, matrix (Ma) protein and microfibril (Mf) protein, was investigated. Ma protein or Mf protein was extracted partially from human hair and two types of keratins : Ma-rich-fiber and Mf-rich-fiber were prepared. The two keratin-fibers treated with five kinds of proteases, Mf-richfiber showed much higher degradation than that of Ma-rich-fiber and the most effective degradation was found when Proteinase K was used. From amino acid analysis, the degradable fraction of the keratin-fibers was similar to Mf protein. Furthermore, the keratin-fibers treated with Proteinase K showed Mf protein degraded appearance.
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Technical Papers
  • Physical Properties of the Traditional Stitched Fabric, Kogin, of Tsugaru District
    Toshio HAGA, Sadaharu NARITA
    2007Volume 63Issue 10 Pages 241-245
    Published: 2007
    Released on J-STAGE: November 15, 2007
    DOIhttps://doi.org/10.2115/fiber.63.241
    JOURNAL FREE ACCESS
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    The original Kogin fabric, a hemp fabric decoratively stitched in the weft direction with cotton thread , is a traditional farmer's product of the Tsugaru district. Most of bending, shear and compression properties of the original Kogin were larger than respective averaged values of 220 types of lady's suit garment fabrics available today. The front surface of the original Kogin was geometrically smoother. We examined the change in the property values of the hemp fabric caused by the stitching in the weft direction with cotton thread. The stitching generally reduced anisotropy of the property values between the warp and weft directions of the hemp fabric. The stitching increased warmth retention slightly and decreased air permeability drastically. Also, the stitching remarkably improved breaking strength in the weft direction and abrasion resistance.
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