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 26, Issue 1
Displaying 1-7 of 7 articles from this issue
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  • The Effects of the Filler Concentration and Preforming Pressure on the Physical Properties for the Composite Material of PTFE-Polyaramid Fiber
    Munetake SATOH, Yukihiko TSUDA, Takeshi NAKANISHI, Kei MIYANAMI, Shouj ...
    1989 Volume 26 Issue 1 Pages 4-11
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.4
    JOURNAL FREE ACCESS
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    A fundamental experiment on the development of polymer-based composite materials having a low friction coefficient and wear-resistance has been carried out. Chopped fiber of polyaramid (aromatic polyamide: Kevlar) was employed as the filler and mixed with fine powder of poly-tetra-fluoro-ethylene (PTFE) using a high-speed mixer. The critical pressure Pc, defined as the value at the point of unchanged bulk density, before and after the sintering process, was introduced as an index for the optimal preforming pressure. The relationship between Pc and the concentration of the fiber was expressed as a simple experimental equation. It was shown that the testpiece with a riber content of 14.9vol% preformed at the critical pressure Pc indicated a high modulus of elasticity, fracture energy and strong wearing resistance.
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  • A Consideration of the Mechanism of Particle Shape Separation by a Rotating Conical Disk with a Spiral Scraper
    Kenichi YAMAMOTO, Tatsuo TSUKADA, Masunori SUGIMOTO
    1989 Volume 26 Issue 1 Pages 12-22
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.12
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    To study the shape separation mechanism of solid particles of differing shapes on a rotating conical disk with a spiral scraper, the behaviors of particles travelling along the scraper wall were discussed by using some cylindroid particles differing in cross-sectional shape. In this paper, for the simulation of the particle's motion along the scraper, three types of the motion were proposed and combined each other.
    Simulations were carried out under various operating conditions, anti the values of θs(: the vectorial angle at which a particle leaves the scraper wall) were calculated for each particle.
    The following results were obtained.
    (1) θs decreases with increase in the shape index k over a comparatively wide range of k, where k is the ratio of the semi-minor axis b to semi-major axis a of an ellipse at cross section of a cylindroid. The correlation between θs and k is considerably affected by the rotating speed of the disk n and inclination angle of the disk surface β.
    (2) The particles of differing shapes could be effectively sorted along the scraper on the disk.
    (3) θs values estimated by the simulation agree approximately with the ones observed for various cylindroid particles.
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  • Heat of Immersion of Various Si3N4 Powders
    Keikichi INOUE, Rihito SHOJI, Atsushi SAKON, Masafumi ARAKAWA
    1989 Volume 26 Issue 1 Pages 23-26
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.23
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    The heat of immersion of various Si3N4's were measured using different liquides. The electrostatic field strengths of solid surfaces were estimated from the relationship betweeen the heat of immersion and the dipole moment of the liquid.
    Results of the heat of immersion isotherm show that the surface of Si3N4 had a heterogeneously active site for the -OH radical in the form of butanol. In addition, the mechanism of the interaction during immersion was discussed.
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  • Measurements of the Angle of Repose of Rice Granules Under Ambience in Air and Water
    Yusaku FUJIO, Yoshitake KAWAI
    1989 Volume 26 Issue 1 Pages 27-32
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.27
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    The angles of repose of nonglutinous and glutinous rice as typical biological particles were measured by the revolving cylinder test under variable ambiences ranging from air to water.
    The results were as follows:
    1) Almost the same angle of repose of glass beads resulted under the ambience in air and in water. When comparing the angle of repose of rice under ambience in water with that in air, angles of repose of 8 and 10 degrees were given for nonglutinous rice and for glutinous rice, respectively. for glutinous rice, respectively.
    2) As the amount of water was increased, defined as the total kg of water per 100kg of dried rice particles, the angle of repose of rice suddenly increased at 30 to kg of water. When the amount of water was 50 to 150×10-3kg, the angle of repose could not be determined because of strong cohesive force among the particles.
    3) Both the increase in the bulk volume and the decrease of the apparent density of rice caused by an increase of granule size since the adsorption of water had little on the measures of the angle of repose.
    4) A strong minus correlation existed between the apparent density and the angle of repose in water up until water was noticed on the surface of the rice granules.
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  • Fundamentals and Applications of Cell Size Distribution
    Kazuhisa OHTAGUCHI
    1989 Volume 26 Issue 1 Pages 33-39
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.33
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  • [title in Japanese]
    Masahiko KIKUCHI
    1989 Volume 26 Issue 1 Pages 49-51
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.49
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  • [title in Japanese]
    1989 Volume 26 Issue 1 Pages 52-57
    Published: January 10, 1989
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.26.52
    JOURNAL FREE ACCESS
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