Powder treating method and apparatus used therefor

Details Powder treating method and apparatus used therefor Powder treating method and apparatus used therefor

B - Operations, Transporting

01

J

204/181, 204/96

B01J 2/00 (2006.01) B01J 2/10 (2006.01) B01J 19/08 (2006.01) B01J 19/12 (2006.01) B01J 19/18 (2006.01) B01J 19/28 (2006.01) C09C 3/04 (2006.01)

Patent

CA 1327769

- 1 - Abstract The powders e.g. pigments, are treated with low temperature plasma so that chemical properties are improved. In the low temperature plasma treatment, if a plurality of powders coagulate into one lump, or if powders cohere on the vessel's inside wall surface, it is difficult to conduct a uniform and efficient treatment. The present invention provides powder treating methods and apparatus used therefor which makes possible a uniform and efficient treatment of powders with low temperature plasma. In a first embodiment there is a powder treating method characterized in that powders are treated with low temperature plasma while stirring them by vibration. The second embodiment is a powder treating apparatus, comprising a treating chamber for housing powders, said treating chamber being formed by an upper vessel and a lower vessel each having an opening mated to one another, a means for vibrating this treating chamber to stir said powders to form a fluidized layer and a plasma producing means, in which the powders in the treating chamber are treated under reduced pressure and with low temperature plasma while stirring them by vibration, and an insulator is provided at a junction between the upper and lower vessels so as to electrically insulate these upper and lower vessels, so that these two vessels may be utilized as mutually facing exciting electrode and grounding electrode. The third embodiment is a powder treating method characterized in that powders - 2 - are treated with low temperature plasma while being stirred by a precessional movement of a spiral screw which is being rotated.

539941

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