Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
Search
Advanced search
OR
Browse
Search
Volume 69, Issue 6
Journal of the Society of Fiber Science and Technology
Displaying 1-12 of 12 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Reviews and News
Foreword
Special Issue on New deployment of nanofiber
Report
Serise of Reviews for High Performance Papers, Specialty Papers 6
Serise of Cultural Tradition Associated with Festivals 3
Original Articles
Transaction
  • Development of Fine Stockings to Reduce Shoe Sores
    —In Terms of Shock Absorption—
    Harumi Morooka, Tetsu Sasagawa, Rieko Motoi, Hideo Morooka
    Article type: Original Articles
    Subject area: Transactions
    2013 Volume 69 Issue 6 Pages 101-106
    Published: June 10, 2013
    Released on J-STAGE: June 12, 2013
    DOIhttps://doi.org/10.2115/fiber.69.101
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    To develop fine stockings to reduce shoe sores, we initially clarified the relationship between the compression as well as stress relaxation characteristics of commercially available products to prevent shoe sores and feelings on use. As a result, among the commercially available products to prevent shoe sores, the raising type produced better feelings on use than the gel type. In addition, the greater the compression energy or strain, the better the feelings on use were. Smaller stress relaxation indicates greater viscosity. Subsequently, using trial stockings, the above results were confirmed. Stockings with modified pile kitting using wooly yarn(Sample Ps)as one of the 3 types of trial stocking with a modified pile stitch had characteristics similar to those of the above raising type, and produced the best feelings on use. In addition, stockings with a modified plating stitch only in the part that is the most susceptible to shoe sores(Sample K)were produced. The modified plating stitch is characterized by marked compression energy and strain. In a walking simulation experiment, pressure impulsiveness decreased by about 44% in the modified plating stitch part. Finally, a field survey of Sample K was performed to evaluate its “effects on reducing shoe sores”. About 90% of the subjects answered that they felt the effects of Sample K on reducing shoe sores.
    View full abstract
    Download PDF (1212K)
  • Structure and Mechanical Properties of Poly(trimethylene terephthalate)Fibers Obtained by CO2 Laser Drawing and a Secondary Contact Heater Drawing
    Young-Ah Kang, Kyoung-Hou Kim, Xin Zhao, Yang Hun Lee
    Article type: Original Articles
    Subject area: Transactions
    2013 Volume 69 Issue 6 Pages 107-117
    Published: June 10, 2013
    Released on J-STAGE: June 12, 2013
    DOIhttps://doi.org/10.2115/fiber.69.107
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    CO2 laser drawing heats a running fiber homogeneously and rapidly without contact by laser irradiation and develops a necking in a fixed location. As-spun fibers of bio- and chemo-based poly(trimethylene terephthalate)(PTT)were drawn to draw ratio(DR)of 3.5-5.5 and 3.5-4.8 by CO2 laser-heated drawing, respectively, which was taken as the first drawing. Secondarily the first-drawn fibers were drawn to total draw ratio(TDR)as high as possible by direct contact heater drawing of 150°C, which attained TDR 5.60-5.70 and 5.40-5.46 for bio- and chemo-based PTT fibers, respectively. Drawing stress in situ measured in the two-steps drawing increased roughly proportional to draw ratio, and for bio-based PTT was higher than for chemo-based one when compared at the same DR and TDR. We investigated in this study the structure and mechanical properties of the drawn PTT fibers by wide angle X-ray diffraction(WAXD), birefringence, thermo-mechanical property, and tensile property. The typical WAXD pattern of PTT crystal was observed with orientation-induced crystallization by the two-steps drawing. But, the meridional reflections become blurred and their intensities decrease with increasing draw ratio and by the second drawing. The transverse crystallite sizes, along the normal direction of(010)plane, increased transversely but the longitudinal sizes, along the normal direction of(002)plane decreased longitudinally as draw ratio increased for chemo-based PTT, whereas for bio-based PTT, the crystallite size change with draw ratio was the same trend with the chemo-based by the first drawing but the crystallite became much smaller transversely and longitudinally by the second drawing. By the azimuthal intensity profile, the crystal orientation factor obtained from(010)plane increased, while that from(002)plane decreased with the total draw ratio. The birefringence was a constant value 0.07 with no dependence on draw ratio by two steps drawing, which is over twice a reported intrinsic birefringence of PTT crystal, 0.029 [12]. Also, Young's modulus held an almost constant value of 2.3-2.6 GPa by the two stages drawing, which is very closed to 2.59 GPa, the theoretical modulus of PTT crystal.
    View full abstract
    Download PDF (2841K)
  • Structure of Melt-Electrospun Poly(L-lactic acid)/Poly(D-lactic acid)Blend Fibers
    Goro Nishikawa, Masaki Yamamoto, Hideki Yamane, Amalina M. Afifi, Jae- ...
    Article type: Original Articles
    Subject area: Technical Paper
    2013 Volume 69 Issue 6 Pages 118-124
    Published: June 10, 2013
    Released on J-STAGE: June 12, 2013
    DOIhttps://doi.org/10.2115/fiber.69.118
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Blend fibers consisting of equal amount of poly(L-lactic acid)(PLLA)and poly(D-lactic acid)(PDLA)were prepared by a melt-electrospinning process using a CO2 laser irradiation. The fiber structure was investigated by a differential scanning calorimetry, a scanning and a transmission electron microscopies, and an X-ray diffraction. The average fiber diameter decreased and the width of the diameter distribution tended to be narrower with increasing applied laser output power. The melting endotherm of the stereocomplex crystal(Sc)around 220　°C became larger and sharper while that of the homo-chiral crystal(Hc)around 170　°C became smaller with increasing laser output power. The X-ray diffraction patterns of the annealed fibers indicated the coexistence of an oriented Hc and a randomly oriented Sc. However the selected-area electron diffraction pattern revealed that Sc in the annealed very fine fiber has higher degree of orientations of Hc and Sc to the fiber direction than those in the fiber with larger diameter.
    View full abstract
    Download PDF (6724K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top