Ricoh Company, Ltd.

Makoto Hirai

Nobuyasu Makino

Fumitoshi Murakami

Mutsumi Takahashi

Tetsuya Tanaka

Shinya Hanatani

Kaoru Aoki

Hiroki Morioka

A classifying apparatus including: a rotor with a plurality of annularly disposed blades, which rotates; and a louver with a plurality of blades which are disposed at an outer circumferential portion of the rotor so as to supply from the outer circumferential portion a fluid for dispersing and classifying a powder material, wherein the powder material is supplied to a gap between the rotor and the louver and centrifugally classified into fine powder and coarse powder, and wherein at least one of the following relationships is satisfied: Relationship (1): &#x3b1;&#x2267;50&#xb0; Relationship (2): D/D&#x2267;1.17 where &#x3b1; denotes an angle formed between imaginary lines connecting the center of the rotor with both ends of each blade of the louver, Ddenotes a diameter of the rotor, and Ddenotes an inner diameter of the louver.

Classifying apparatus, classifying method, and method for producing toner

A fluidized bed pulverizing and classifying apparatus is disclosed having a vessel that includes a pulverizing section having a pulverizing nozzle spraying compressed air to pulverize a powder, a classifying section located over the pulverizing section, including a classifying rotor classifying the powder, and a fluidized bed. The vessel also contains a supply of secondary air.

Fluidized bed pulverizing and classifying apparatus, and method of pulverizing and classifying solids

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Fuji, Japan

Makoto Hirai