Journal of the Society of Powder Technology, Japan

Effect of Hydrophobic Surface Treatment of Quartz Particles on Packing and Flowability of Powder

Michitaka Suzuki, Masayoshi Kobayashi, Kenji Iimura, Mitsuaki Hirota

2001 Volume 38 Issue 7 Pages 468-472
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.468

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The present work studied the effect of surface property of quartz particles on the packing and flowability of powder bed. The hydrophobic quartz powders were prepared by mechano-chemical reaction during ball mill grinding of quartz sand with hexane solution of cetyl alcohol. Tapping test, compressive test and shear test of the ground quartz powders were performed in dry, standard and humidified conditions. The tapping and compressive tests showed that the hydrophobic surface treatment is effective to achieve high-density packing of powder, and the shear test revealed that the hydrophobic surface treatment improves the flowability of fine powders. The hydrophobic surface treatment of quartz particles was effective not only in humidified condition but also in dry or standard conditions.

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Consideration on Dynamics of Decelerated Ascent Motion of Grains in Inclined Disc Pelletizer

Tohru Moriwaki

2001 Volume 38 Issue 7 Pages 473-481
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.473

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In an inclined disc pelletizer used for build-up granulation of powder, grains are circulated on an inclined rotating disc. The circulation of grains consists of three periods; the ascent period of grains with the same velocity as the disc rotation rate, the subsequent decelerated ascent period, A, and the rolling-down period, B. In this paper, dynamic analysis is applied to the grain motion in both period A and B, and the trajectories and velocity change of grains are numerically calculated. Through the analysis, criterion adequate for determining relationships among the frictional coefficient of grains, the inclination angle of disc and Froude number of disc rotation during the operation of pelletizer is presented in place of Bhrany's equation.

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Improved Dispersibility of Iron Oxide Particle Coated by Ether-modified Poly-Siloxane for Water-based Paint

Kazuyuki Hayashi, Mineko Ohsugi, Hiroko Morii, Kikuo Okuyama

2001 Volume 38 Issue 7 Pages 482-486
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.482

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Iron oxide pigments, such as hematite, goethite and magnetite particles are used as coloring material because of their suitable natural colors and chemical stability. Water-based paints with better dispersibility are strongly required in terms of environmental influence and for harmless handling recently.
In this paper, we have investigated the coating by ether-modified poly siloxane onto iron oxide particles in order to improve the dispersibility in water-based paint. The coated iron oxide particles not only have better dispersibility but also good storage stability because of the larger negative charge on the modified siloxane coated particle surface in water-based paint.

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Material Separation from Automobile Shredder Dust by Pneumatic Separation Method

Jun Oshitani, Kouji Kiyoshima, Zennosuke Tanaka

2001 Volume 38 Issue 7 Pages 487-492
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.487

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Material separation from automobile shredder dust containing urethane, plastic, rubber, wire harness, and nonferrous metals is performed by pneumatic separation method. When the dust is blown and entrained by a horizontal wind, lighter components are carried a longer distance, resulting in the rough separation of components due to weight difference. The entrained distance difference of component becomes larger with the air velocity. In the present work, the weight of each component at every 25cm interval in the scattered region is measured, and the purity and recovery are obtained in order to evaluate the separation efficiency. Both the purity and the recovery of urethane are about 90% at each air velocity, whereas the recovery of other components is not as high but the purity is increased with the air velocity.

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Measurement and Reduction Technology for Diesel Exhaust Particulate

Keizo Saito

2001 Volume 38 Issue 7 Pages 493-502
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.493

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Quality Control and Advancement of Function on the Toner Technology

Jun Shimizu

2001 Volume 38 Issue 7 Pages 503-511
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.503

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[title in Japanese]

Takehiko Yasuji

2001 Volume 38 Issue 7 Pages 512-513
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.512

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[title in Japanese]

Teruo Suzuki

2001 Volume 38 Issue 7 Pages 514-515
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.514

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[title in Japanese]

Fumio Saito

2001 Volume 38 Issue 7 Pages 516-518
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.516

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[title in Japanese]

[in Japanese]

2001 Volume 38 Issue 7 Pages 519
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.519

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[title in Japanese]

[in Japanese], [in Japanese]

2001 Volume 38 Issue 7 Pages 520
Published: July 10, 2001
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.4164/sptj.38.520

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