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The effects of frequency and amplitude on the powder coating of fluidizing particles in a vibro-fluidized bed

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—Glass beads were coated in a vibro-fluidized bed by atomizing a fine silica powder and polyvinyl alcohol solution. The coating efficiency and weight fraction of the agglomerated particles were measured under various experimental conditions, and their dependencies on the amplitude and frequency of vibration were investigated. When the humidity of the outlet gas was high, high coating efficiency and agglomeration of core particles were observed. The efficiency of the powder coating decreased as the amplitude and the frequency increased, while the agglomeration was prevented by the addition of vibration. It was confirmed that high-quality and high-efficiency coating, where few agglomerates were produced and silica powder was utilized efficiently, was possible using the vibro-fluidized bed with adequate amplitude and frequency.

Affiliations: 1: Department of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu-shi 804-8550, Japan; 2: Kyushu Plant, Mitsubishi Chemical Corp., 1-1 Shiroishi Kurosaki, Yahatanishi-ku, Kitakyushu-shi 806-0004, Japan

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