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 40, Issue 9
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Noboru Suzuki
    2003 Volume 40 Issue 9 Pages 623
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.623
    JOURNAL FREE ACCESS
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  • Shape Separation of Particles by a Newly Developed Separator with Flowing Liquid Film
    Kenichi Yamamoto, Takashi Nishikawa, Toshiaki Miyajima, Ryohei Yamazak ...
    2003 Volume 40 Issue 9 Pages 624-630
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.624
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    A new shape separator with flowing liquid film was developed and the performance of the separator was evaluated through the experiments with mixtures of spherical and irregularly shaped particles having diameters of about 150-420μm. As a result, this separator was capable of effectively separating particles according to the particle shape in liquid with a small inclination angle of the conical disk under the optimal operating conditions, such as rotational speed of the disk, liquid flow rate of flowing-film and particle feed position. The separation efficiency under various operating conditions was determined mostly by the frictional characteristics of irregularly shaped particles on the rotating conical disk.
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  • Toner Size Selectivity in Electrophotographic Transfer Process
    Akihiko Noda, Manabu Takeuchi, Yoshiro Yamaguchi, Nobuhiro Katsuta, Ta ...
    2003 Volume 40 Issue 9 Pages 631-638
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.631
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    Graininess of electrophotographic images can be improved by using small size toner. However, small size toner often causes mottles in multiplex transfer full color images. This study investigated the cause of mottle in the multiplex transfer process. The top toner layer in the multiplex transfer process was observed in detail, and size distributions of toner particles were measured before and after the transfer process. It was found that small size toner was apt to have partial lacks of toner particles in the top toner layer of multiplex transfer. The small size toner was difficult to transfer, especially when using a weak transfer electric field. Furthermore, the mottle was found to be caused because the particle size dependency of the force due to transfer electric field was stronger than that of van der Walls force.
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  • Dependence of Toner Charging Characteristics on Toner/Carrier Mixing Ratio
    Hisao Okada, Manabu Takeuchi
    2003 Volume 40 Issue 9 Pages 639-648
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.639
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    Toners which have a charge-to-mass ratio with little dependence on the toner/carrier mixing ratio are suitable for two component developer. The charging characteristics of toners are investigated experimentally and theoretically based on the surface state model. We measured the relationship between the toner's charge-to-mass ratio and toner/carrier mixing ratio as well as the charging rate and the environmental stability, which are of practical importance. The experimentally obtained relationship between the toner's charge-to-mass ratio and toner/carrier mixing ratio are well explained by the surface state model.
    The introduction of conductive materials into the coating resin of carrier is effective for the improvement of charging characteristics. This increases the changing sites on the surface of carriers, and weakens the dependence of toner charge-to-mass ratio on toner/carrier mixing ratio.
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  • Structure and Properties of Thiol-Functionalized Silica Gels Prepared by Sol-Gel Process
    Hidekazu Tanaka, Masahiro Yokoji, Ryozi Hino
    2003 Volume 40 Issue 9 Pages 649-654
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.649
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    The thiol-functionalized silica gels were prepared from a mixture of Si(OEt)4 (TEOS) and C3H6SHMeSi(OMe)2 (MPDMS) in n-octane solvent by sol-gel process. The pore structure and the adsorption characteristics for metal ions such as Ag+, Hg2+, Pb2+ and Zn2+ were investigated as the fundamental properties. The thiol-functionalized silica gels were formed at a mole fraction of MPDMS (Xm=MPDMS/(TEOS+MPDMS)) smaller than 0.3. The amount of thiol groups in the silica gels increased with Xm. For Xm=0-0.1, the pore diameter of silica gels also increased with Xm. These results suggested that the pore structure of silica gels is altered by the introduction of C3H6SH groups in the gels. The thiol-functionalized silica gels adsorbed Ag+ and Hg2+ more than Pb2+ and Zn2+.
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  • R & D of Milling Technology in Pharmaceutical Industry
    Tadashi Fukunaka, Jean W. Tom
    2003 Volume 40 Issue 9 Pages 655-663
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.655
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    In the pharmaceutical industry, milling process is important to improve the solubility of the bulk drug by grinding them into the small particle size. Small particles as the bulk drug help patients to be easily dissolved in their body, because most of them have very low solubility. However, the grinding characteristics and scale-up methodologies of ordinary milling techniques for pharmaceutical compounds have hardly ever been reported. In this study, five kinds of milling techniques (jet-mill, fluidized jet-mill, pin-mill, cosmomizer and cavitation-mill) for the drug: MK-J1, which we have developed, were evaluated on the basis of the particle size of the milled material and the durability and the scale-ability of these techniques. From this study, the fluidized jet-mill can be found to obtain the finest particle in size and the sharpest distribution and show the most durability. The scale-up number, Fn, derived from the dynamic balance of a centrifugal classifier was defined as the scale-up factor and its application-ability was also evaluated using the larger scale equipment.
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  • New Functional Materials Created by the Techniques of Particle Assemblage
    Mikihiko Kobayashi, Hideki T. Miyazaki, Norio Shinya
    2003 Volume 40 Issue 9 Pages 664-671
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.664
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  • Producing Uniformly Sized Hollow Silica Particles by Applying Electrostatics
    Masayuki Sato
    2003 Volume 40 Issue 9 Pages 672-677
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.672
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  • [title in Japanese]
    Akihiko Ema
    2003 Volume 40 Issue 9 Pages 678-679
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.678
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  • [title in Japanese]
    Katsura Takano
    2003 Volume 40 Issue 9 Pages 680-681
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.680
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 40 Issue 9 Pages 683
    Published: September 10, 2003
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.40.683
    JOURNAL FREE ACCESS
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