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Volume 58, Issue 7
Displaying 1-5 of 5 articles from this issue
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Tatuhiko IHARA, Seisirô ITÔ, Tosihide KUWAHARA, Mituo KIBO ...1985 Volume 58 Issue 7 Pages 383-389
Published: July 20, 1985
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDispersion of carbon black in water was remarkably improved by the low temperature oxygen plasma treatment, but the degradation products like humic substance were formed on the carbon black surface by this treatment. In order to depress the amounts of degradation products without lowering the dispersibility in water, the plasma oxidization treatment of carbon black was carried out by using a mixture of oxygen and nitrogen or hydrogen as a plasma gas.
The amounts of the degradation products were decreased with the increase of the amount of the added gas. The effect of added hydrogen was greater than that of nitrogen. The dispersibility in water became lower with decrease of amounts of degradation products, but the sample treated with the mixed gas containing 0.4 volume fraction of hydrogen had minimum amounts of degradation products and showed good dispersibility in water. It was found that the plasma treatment using hydrogen gas without oxygen has the effect of cleaning the sample surface.View full abstractDownload PDF (818K) -
Kazuyuki TACHI, Katsunori YAMADA, Chikaaki OKUDA, Shouichi SUZUKI1985 Volume 58 Issue 7 Pages 390-401
Published: July 20, 1985
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSIn order to clarify the atomization of paint by means of a high-speed electrostatic rotary atomizer, which is usually used at the rotational speeds above 10,000 rpm (or the peripheral speeds above 40 m/s), stroboscopic photographs were taken around the edges of various rotating cups at the various spray conditions, and the diameters of paint particles were measured by means of the immersion liquid method. The results are summarized as follows :
(1) In the case of the rotating cup with a sharp edge, filmlike atomization occurs. Provision of saw-teeth and grooves for the cup edge makes paint to be atomized in filamentlike mode, but it does not affect Sauter's mean diameter of the paint particles.
(2) The atomization mode is not dependent on paint flow rate, paint viscosity and cup rotational speed. However, the particle diameters change remarkably. The atomization mode and particle diameter are little influenced by applied voltages.
(3) The particle diameter increases with film size in the filmlike atomization, and with filament length in the filamentlike atomization. However, the particle diameters are independent of atomization modes.View full abstractDownload PDF (2283K) -
Tsuguo YAMAOKA, Riichirou KUSAKI1985 Volume 58 Issue 7 Pages 402-418
Published: July 20, 1985
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2144K) -
Masami NISHIHARA, Nobuo IWANE, Junichiro IMAI1985 Volume 58 Issue 7 Pages 419-423
Published: July 20, 1985
Released on J-STAGE: November 20, 2012
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Junichi YAMADA1985 Volume 58 Issue 7 Pages 424-432
Published: July 20, 1985
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (888K)
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