Sen'i Gakkaishi
Online ISSN : 1884-2259
Print ISSN : 0037-9875
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Volume 71, Issue 9
Journal of the Society of Fiber Science and Technology
Displaying 1-11 of 11 articles from this issue
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Reviews and News
Foreword
Special Issue on Fiber for Sports Users(2)
Review
Series of Fiber Basic Course Lectured by Professional Engineers-12
Serise of Historical Reviews of Japanese Textile Industry Supported by the Technology-History of the Production, Sales, and Product Development-24
Foreign News Letter
Original Articles
Transactions
  • Effect of Drawing Speed on Infusion and Drawing Behaviors of Poly(ethylene terephthalate)Filaments upon Cold Drawing in Ethanol
    Rina Khanum, Dong Woo Go, Wataru Takarada, Arun Aneja, Takeshi Kikutan ...
    2015 Volume 71 Issue 9 Pages 273-283
    Published: September 10, 2015
    Released on J-STAGE: September 08, 2015
    DOIhttps://doi.org/10.2115/fiber.71.273
    JOURNAL FREE ACCESS
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    We have reported previously that multiple neck appears, yield and drawing stresses decrease and natural draw ratio increases if drawing of low oriented amorphous poly(ethylene terephthalate) (PET) filament is carried out in ethanol rather than in the air or water. Crystallization of PET at room temperature took place in the cold drawing through the infusion of ethanol into filament. Based on these results, investigation on the effect of drawing speed on infusion and drawing behaviors of PET filament upon cold drawing in ethanol was carried out in this research. The decrease in drawing speed caused the reduction of number of neck, reduction of yield and drawing stresses and increase of natural draw ratio. Even though number of neck was larger at higher drawing speeds, analyzed propagation speed of individual neck point increased with the increase of drawing speed. On the other hand, amount of infused ethanol in filament at a high draw ratio increased with the reduction of drawing speed, which lead to the appearances of more distinct crystalline reflections in the wide-angle X-ray diffraction pattern and equatorial streaks of higher intensity in the small-angle X-ray scattering pattern. When the drawing was carried out in the ethanol mixed with dye, infusion of dye molecules was more distinct at lower drawing speeds, and vividly colored fiber was obtained at room temperature.
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  • The Cluster Size and Change of Water Molecules in Poly(vinyl alcohol) Film by Heating
    Saori Tamura, Ryo Oono
    2015 Volume 71 Issue 9 Pages 284-290
    Published: September 10, 2015
    Released on J-STAGE: September 08, 2015
    DOIhttps://doi.org/10.2115/fiber.71.284
    JOURNAL FREE ACCESS
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    The cluster size of water molecules in poly(vinyl alcohol) (PVA) film was determined using the cohesive energy equation and the heat of evaporation of water. On the heating process of PVA film, the mass of evaporated water was measured by thermogravimetric analysis (TGA) and the heat of evaporation was measured by differential scanning calorimetry(DSC). The evaporation energy and the cluster size are closely related each other, and the size was calculated using the equation of cohesive energy which contains surface energy. As a result, the size of water cluster in 0% relative humidity (RH) film was about 13.2 molecules, 40% RH film was 6.6 molecules and 80% RH film was 3.5 molecules, respectively. The cluster size in 0% RH and 40% RH films are likely to contain errors caused by the overestimation of evaporation energy. In the film of 80% RH, the clusters of 3.5 molecules were absorbed at a ratio of one cluster per 5.3 repeating units of PVA chain. The cluster size was calculated at various temperatures in the order of evaporation. The average cluster size in 80% RH film was about 1-2 molecules on the film surface and it was about 3.5 molecules in the inside of film.
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  • Effects of Carboxymethyl Cellulose Sodium Addition on Properties of Beaten Recycled Reed Pulps and the Handsheets
    Hailan Jin, Junhyung Cho, Takayuki Okayama, Lihui Chen, Jian Li
    2015 Volume 71 Issue 9 Pages 291-296
    Published: September 10, 2015
    Released on J-STAGE: September 08, 2015
    DOIhttps://doi.org/10.2115/fiber.71.291
    JOURNAL FREE ACCESS
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    In this study, the effect of adding CMC (Carboxyl methyl Cellulose Sodium) on freeness and WRV (water retention value) of pulps and properties of handsheets was evaluated. In any case, the freeness and WRV of pulps and tensile strength of the handsheets increased with the additive amount of CMC before beating. The increase in tensile strength of the handsheets was dependent on the increase in interfiber bonding strength based on the Page equation. Experimental results showed that the addition of CMC before to reed pulp beating resulted in improvement of paper strength due to enhanced fiber swelling.
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