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 18, Issue 2
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Masashi AONO, Mikio AOYAMA, Akiko IKEGAWA, Kikaku IKEMORI, Kou UEDA, K ...
    1981 Volume 18 Issue 2 Pages 79-94
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.79
    JOURNAL FREE ACCESS
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  • Determination of the Bottom Pressure Distribution of Pressed Powder Bed by Pressure Detecting Sheet
    Isao KURI, Hiroshi KUNO
    1981 Volume 18 Issue 2 Pages 95-101
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.95
    JOURNAL FREE ACCESS
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    The bottom pressure distribution of the pressed powder bed was determined using commercial pressure detecting sheet. As a model powder, glass beads (0.105mm-0.088mm) was charged into stainless steel cylinder of 44.0mm, 29.6mm and 18.2mm diameter respectively, From photo-densitometry of the colored sheets, the local pressure was determined within the relative error of ±10%.
    From the results of varying applied pressures (0.291kg/mm2-0.584kg/mm2) and thicknesses of the bed (9.2mm-48.6mm), a simple empirical equation
    σz/Po=a(γ/R)2+b
    where σz is the bottom pressure, Po is the applied pressure, γ is the distance from center, R is the inner radius of the cylinder and a and b are constants, was obtained.
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  • Characteristics of Storage and Flowability of Finely Particulated Masses
    Suk-Ho KANG, Moon-Jung WOO
    1981 Volume 18 Issue 2 Pages 101-109
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.101
    JOURNAL FREE ACCESS
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    The angle of repose of some fine powders as a means to evaluate their flowability is measured in a rectangularr test box under various experimental parameters, such as shape, particle size, and relative humidity., At any constant relative humidity, the angle of repose of the finely particulated solids increases with decrease in the particle size from 120 to 60μm, but it remains nearly constant for the size range of less than 60 through 70μm. It is concluded that the powder flowability reveals its lowest behavior at 120μm. The powder flowability decreases continuously with increase in the relative humidity above 50%. By using the rectangular test box, it is possible to evaluate the powder flowability more conveniently than by other methods.
    The above experimental parameters are examined for the bottom pressure exerted by the fine powders in a test silo. The bottom pressure is directly proportional to the average particle size of the powder, as expected in the Janssen equation which was theoretically developed. The relative humidity more complicatedly affects the bottom pressure exerted by finely particulated solid powders than by coarsely particulated masses, such as harvest grains and the glass beads. At 70% relative humidity, the bottom pressure reaches the highest value. It is not appropriate to predict the bottom pressure of the fine powder with the Janssen equation, so it is recommendable to include the cohesion term into the equation estimating the bottom pressure of the fine powders.
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  • [title in Japanese]
    Masayoshi ADACHI, Kazuo SAITOH
    1981 Volume 18 Issue 2 Pages 110-113
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.110
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Tatsuo TANAKA
    1981 Volume 18 Issue 2 Pages 114-123
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.114
    JOURNAL FREE ACCESS
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  • Weather Modification
    Norihiko FUKUTA
    1981 Volume 18 Issue 2 Pages 124-133
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.124
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Woo Sik CHOI
    1981 Volume 18 Issue 2 Pages 134-136
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.134
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Yutaka TSUJI
    1981 Volume 18 Issue 2 Pages 137-138
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.137
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1981 Volume 18 Issue 2 Pages 139-152
    Published: February 10, 1981
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.18.139
    JOURNAL FREE ACCESS
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