Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 31, Issue 7
Displaying 1-9 of 9 articles from this issue
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  • Ettects of UV Irradiation on the In-situ Surface Modification of Calcium Carbonate with a Crosslinked Polymer during Impact Comminution
    Takahiro MURATA, Kenji HAMADA, Takayuki TANAKA, Kenichi WATANABE, Mamo ...
    1994 Volume 31 Issue 7 Pages 468-475
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.468
    JOURNAL FREE ACCESS
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    Irradiation by a 365nm beam onto CaCO3 powder under comminution was carried out for the surface modification of a powder with a photosensitive acrylic oligomer. A commercial impact mill (New Cosmomizer I, Nara Machinery) was modified by providing UV transparent windows on the self-recycling path. The coated fine particles were washed with acetone to remove non-cured oligomer and were then subjected to thermal analyses, TG-DTA. The weight loss increased linearly with the DTA peak area due to thermal decomposition of the surface polymer. The decomposition temperature of the surface polymer was elevated by the irradiation, indicating stabilization of the surface polymer. The existence of the stable surface film was verified from the flocculation behavior of the modified particles in water, the larger apparent particle size, and the decrease in the dissolution rate of CaCO3 into a diluted aqueous solution of HCl.
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  • The Effect of the Amount of Collected Coagulant Droplets on the Coagulation Phenomena of Polymer Latex
    Naoki FURUKAWA, Tomoyuki YOSHIMI, Wataru OKADA
    1994 Volume 31 Issue 7 Pages 476-482
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.476
    JOURNAL FREE ACCESS
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    In this study, the mechanism of the coagula formation from polymer latex droplets by collecting coagulant droplets and the effect of the amount of collected coagulant droplets on the coagulation phenomena were studied. The following results were obtained.
    1) Many traces of coagulant droplets remained as depressions on the surface of the coagulated particles.
    2) A coagulated layer grew toward the center of the latex droplet as time passed with a circular interface between the coagulated layer and the uncoagulated latex.
    3) The relationship between the amount of the coagulant collected by a single particle and coagulation conditions was estimated according to the following equation:
    Q=kFdP2ZC, k=17.1
    4) As the amount of coagulant ions collected by a latex droplet increased, the spherically coagulated particles were more fully recovered because of the higher conversion of the latex droplet.
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  • Compounding Operation of a Thermoplastic Resin Powder-Charge Control Agent and its Triboelectricity
    Takashi TESHIMA, Ayumi KUROKI, Takayuki ITAKURA, Keijiro TERASHITA, Ke ...
    1994 Volume 31 Issue 7 Pages 483-489
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.483
    JOURNAL FREE ACCESS
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    In order to design the toner particles of thermoplastic resin coated with charge countrol agents (CCA), a dry coating method was applied to its complex formation. Experiments were carried out with a high speed-high shear mill by changing operating conditions. The compound states of the particles designed were evaluated by the measurement of lightness. The triboelectricity of the particles obtained were investigated by the Blow-off measurement of triboelectric charge in the case of mixing with magnetic material particles (Carrier).
    The results obtained are summarized as follows:
    1) It was found that the triboelectric charge of composite particles is maximum against operation time under each operating condition. The maximum was obtained at a shorter operation time under the condition of higher rotating speed of the casing and narrower gap between the inner piece and the casing.
    2) It was possible to represent a curve of the triboelectric charge vs. energy consumption despite various operating conditions. Then it was apparent that the triboelectric charge of the CCA-coated composite particles makes a maximum against energy consumption, and the maximum was obtained at about 2×106J/kg.
    Based on these facts, it is possible to design the CCA-coated composite particles which have excellent triboelectricity by the dry coating method, and to determine the optimum operating conditions.
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  • The Effect of Operational Condition on the Powder Composite Process by a Mechanical Method
    Akira KONDO, Makio NAITO, Toyokazu YOKOYAMA
    1994 Volume 31 Issue 7 Pages 490-492
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.490
    JOURNAL FREE ACCESS
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  • Research and Development Trends in Sand Mills
    Yasuhiro MURAKAMI, Toshiyuki TESHIBA
    1994 Volume 31 Issue 7 Pages 493-499
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.493
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Masaaki NAKAMURA
    1994 Volume 31 Issue 7 Pages 509-513
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.509
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Noriyuki YAMADA
    1994 Volume 31 Issue 7 Pages 514-516
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.514
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1994 Volume 31 Issue 7 Pages 517-522
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.517
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Kenichi YOSHIE
    1994 Volume 31 Issue 7 Pages 523-525
    Published: July 10, 1994
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.31.523
    JOURNAL FREE ACCESS
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