Nippon Paper Industries Co., Ltd.

Aikawa Iron Works Co., Ltd.

Minoru Ishida

Yoshihiko Aikawa

Tatsumi Hosaka

Tomoaki Koyanagi

Munetaka Sonoda

Masami Kashibo

A flotation apparatus F includes a tankfor receiving a liquid raw material, and introduces air into the tankto generate bubbles for adsorbing print ink in the liquid raw material to the bubbles, thereby floating and separating the print ink. The flotation apparatus F includes a circulating device for circulating the liquid raw material by raising and then lowering the liquid raw material in the tank, an air supply tubefor supplying air into the tank, and an agitating memberprovided in the tankfor taking the air from the air supply tubeand agitating the air for forming the air into fine bubbles. The agitating memberhas a rotary shaftheld horizontally and a plurality of membershorizontally separately provided around an outer periphery. On a cross section transverse to a longitudinal direction of the tank, an outer periphery of the agitating memberis arranged on a lower side of the tankand in a position at a downstream side of the liquid raw material relative to a vertical line V passing through a center of the tank

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Tomakomai, Japan

Minoru Ishida