Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
Volume 21, Issue 4
Displaying 1-5 of 5 articles from this issue
  • Zhong-qi HAN, Hiroaki MASUDA, Takashi KADOWAKI
    1984Volume 21Issue 4 Pages 199-205
    Published: April 10, 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    The flow-pattern of particles in a storage vessel of a table feeder was studied with particular attention to the effects of inclination of the storage vessel or a turn table, with or without hopper contraction and scraper. It was found that the width of the plug-flow region under normal condition (without inclination) became smaller when particles were continuously fed on the top of the powder bed. Inclination of a storage vessel or a turn table caused flow distortion which was found to be more intensive for the vessel inclination. The flow-distortion was, however, controlled by using a scraper at a suitable position. For controlling the powder flow rate without flow distortion, it was recommended to utilize more than two scrapers simultaneously. It was also found that the converging hopper or an unsuitable scraper caused intense flow distortion.
    Furthermore, the velocity of the distorted flow and the expansion speed of the distorted region were also studied.
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  • Preliminary Investigation on Explaining the Defects of Conventional Methods and Their Improvement
    Yoshihisa SAGAWA, Teruo SAKAMOTO
    1984Volume 21Issue 4 Pages 206-211
    Published: April 10, 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In the conventional methods of fluidized bed granulating only the porous and surfacecoarse granules have been able to be produced.
    In this study, the new method was developed to improve these defects that the conventional methods had possessed.
    In the conventional methods, the drying process comes after the spraying process is finished. As only the agglomeration of particles occurred in the spraying process, even the weak structure of granules were not destroyed in this process. As a result, porous. granules are produced in this method.
    On the other hand, when the spraying and the drying are mutually repeated in the spraying process, the growth of particle is promoted while the weak structure of granules, are destroyed. As a result, the compactness and the smoothness of granules is promoted.
    When spraying and agitating are mutually repeated instead of spraying and drying in the spraying process, the compactness and the smoothness of granules are greatly promoted.
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  • Investigation of the Granulating Conditions to Promote Compactness, Smoothness and the Growth of Granules
    Yoshihisa SAGAWA, Teruo SAKAMOTO
    1984Volume 21Issue 4 Pages 212-217
    Published: April 10, 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
    In the previous paper, we studied the method to improve the compactness and smoothness of granules produced by the fluidized bed granulating method. As results, it was found that compactness and smoothness were promoted when spraying and the agitating were mutually repeated, in the process of spraying.
    In this paper, the effect of crushing and plastic deformation, both by agitating, on the compactness and smoothness of granules were compared. The following results were obtained.
    1. The plastic deformation of granules by agitating was more effective than the crushing of granules by agitating, to promote the compactness and smoothness of granules.
    2. Considering the above findings, the most suitable sequence of fluidiaed bed granulating was the one composed of spraying, pre-drying, agitating and drying.
    3. To promote the growth of particles by the use of this sequence, it was found that the method of repetition and gradually increasing the feed-rate of spraying solution was very effective.
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  • Kazutaka MAKINO, Masaharu YAMADA, Masayoshi KAWAHARA, Kohtaro KURAMITS ...
    1984Volume 21Issue 4 Pages 218-223
    Published: April 10, 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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  • Ryuichi MORIYAMA
    1984Volume 21Issue 4 Pages 232-235
    Published: April 10, 1984
    Released on J-STAGE: April 30, 2010
    JOURNAL FREE ACCESS
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