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 34, Issue 4
Displaying 1-11 of 11 articles from this issue
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  • Coating on Barium Sulfate and Magnetite by Hydrolysis of Metal Alkoxides
    Mitsumasa KIMATA, Mitsuhiro KOIZUMI, Masahiro HASEGAWA
    1997 Volume 34 Issue 4 Pages 206-211
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.206
    JOURNAL FREE ACCESS
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    Silica and titania were coated on barium sulfate and magnetite by hydrolysis of metal alkoxides. The reaction of tetraethoxysilane (TEOS) and titaniumtetraisopropoxide (TTIP) were independent on the seed particles because the over-all reaction constants of TEOS and TTIP were comparable with those obtained using monodispersed silica seed particles. The characterization of composite particles suggested the possibility of silica and titania coating on inorganic particles by the hydrolysis of metal alkoxide. The uniform coating on the inorganic particles was depended on the types of dispersants and coating conditions.
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  • The Stress-strain Rate Relationship for Flowing Coarse Particle Powder Beds Obtained by the 3-Dimensional Distinct Element Method and Experiments
    Shinichi YUU, Akihisa HAYASHI, Masahiro WAKI, Toshihiko UMEKAGE
    1997 Volume 34 Issue 4 Pages 212-220
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.212
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    The relationship between stresses and rates of the strains of flowing coarse particle powder beds (ceramic particles diameter Dp=5mm) were calculated by the 3-dimensional Distinct Element Method (D. E. M.). The experimental relationships were also obtained under the same conditions. The comparison of calculated and experimental stress-strain rate relationships shows that both the dynamic shear and the dynamic normal stresses, which are the values of the differences between measured and static stresses divided by the static normal stress, are expressed by the linear relationships of the strain rates of the flowing particulate beds over a fairly broad strain rate. The following equations show the stress-strain rate relationships in the results of the present investigation.
    τxy=-1/2A1(∂u/∂y)|σy0|+τxy0
    σy=-A2(∂v/∂y)|σy0|+σy0
    , where τxy and σy are the stresses of the flowing powder beds, τxy0 and σy0 are the static stresses, and u and v are the strain rates. These equations show that the product of the strain rate and the static stress indicates the importance of the constitution relationships in the particulate matter.
    Coefficient A1, and A2 in these equations in the present investigation show that A2 of the particulate matter is mush larger than A1. This means that shear deformation occurs more easily than normal deformation in the particulate matter.
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  • The Improvement of a New Estimation Method of Particle Size Distribution by Anisokinetic Sampling
    The Estimation of both Median Diameter and the Deviation of Distribution by Changing the Particle Inertial Parameter
    Hirofumi TSUJI, Hisao MAKINO, Masayoshi KIMOTO, Hideto YOSHIDA, Koichi ...
    1997 Volume 34 Issue 4 Pages 221-227
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.221
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    This paper describes a method for the advanced measurement of the particle size distribution in a gas-particle flow. This method uses the “classification effect” which occurred by anisokinetic sampling. If the sampling velocity is different from that of the main flow, the measured particle concentration deviates from the true value in the main flow. This anisokinetic sampling error is expressed as a function of both the velocity ratio (main flow velocity/sampling velocity) and the particle size.
    The authors have proposed a simplified method for the estimation of both the median diameter and the deviation of the distribution, utilizing the classification effect. In particular particle collection using sampling probes of two different diameters or at points in two different main flow velocities are studied under anisokinetic sampling conditions. It becomes clear that a relationship between the median diameter and the deviation is obtained corresponding to the sampling conditions from the relationship between the velocity ratio and the concentration ratio, when a logarithmic normal distribution or Rosin-Rammler distribution as the particle size distribution function is assumed.
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  • The Fluidization of Fine Particles under Vibrated or Reduced Pressure Conditions
    Katsuji NODA, Yasuhiro SAKAE, Hideyuki IIJIMA, Shigeo UCHIDA, Takanori ...
    1997 Volume 34 Issue 4 Pages 228-232
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.228
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    A vibrated-fluidized bed under reduced pressure was constructed for the fluidization of fine particles. The behaviors in fluidization of glass beads (100μm, 6μm) in vibrated conditions were investigated under atmospheric or reduced pressures. For 100μm particles, the pressure drop through the fixed bed under vibrated conditions was larger than that without vibration at the same gas velocity. Therefore, umf with vibration is smaller than that without it. The effect of vibration upon umf or its behavior in fluidization is insignificant under lower pressure than that at atmospheric pressure. The relatively stable fluidization of Geldant'C (6μm) is achieved under vibration, but it is not obtained without vibration.
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  • The Mechanism of the Break-down and Coalescence by Impacting Particles
    Sadashi TANIGUCHI, Masahiko NAKAMURA, Toshiaki HIGUCHI
    1997 Volume 34 Issue 4 Pages 233-240
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.233
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    Cement powder has already been treated by a high-velocity double-stage impactor (DSI) so as to obtain globular particles. Particle shape and the size distribution of cement particles has been improved.In the application to vinylon fiber-reinforced building materials using globular cement, improvement of the performance (the densification of structure, the strength and the frost resistance) has been reported.
    In this study, portland cement as a model powder, having different particle size distributions has been treated by DSI, and the variation in the particle size distributions was investigated to analyze the breakdown mechanism and coalescence by impacting particles. The study deals with the analysis of particle behavior by computer simulation with a different particle bond-force and using different impacting methods. The simulation results indicate precisely the micromechanism of deformation, densification, breakdown and the coalescence of particles by impacting particles.
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  • The Application of Spray-dried Material to Crude Drug Tablets
    Mitsuhiro SOFUE, Yoshinori UEDA, Masanori YAMAMOTO, Tomoko YAMASAKI, T ...
    1997 Volume 34 Issue 4 Pages 241-243
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.241
    JOURNAL FREE ACCESS
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  • A Method for Comparing the Tablet Compressibility of Crude Drugs
    Mitsuhiro SOFUE, Yoshinori UEDA, Masanori YAMAMOTO, Tomoko YAMASAKI, T ...
    1997 Volume 34 Issue 4 Pages 244-246
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.244
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  • Waste Incineration and Dust Collection Technology
    Hisao MAKINO, Shigeo ITO
    1997 Volume 34 Issue 4 Pages 247-254
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.247
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  • The Impact of Particle Processing Technology on U. S. Industry and Academia
    Reg Davies, Hiroyuki KOHAMA
    1997 Volume 34 Issue 4 Pages 263-268
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.263
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  • [title in Japanese]
    Tadatsugu TANINO
    1997 Volume 34 Issue 4 Pages 269-271
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.269
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  • [title in Japanese]
    Koichi YANAI
    1997 Volume 34 Issue 4 Pages 272
    Published: April 10, 1997
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.34.272
    JOURNAL FREE ACCESS
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