The drying method of the object, and a horizontal rotary dryer

A improves the drying capacity of the dryer, drying as well as to facilitate mass treatment of the object to be treated, the drying method of the object that allow miniaturization, horizontal rotary dryer, and the object to be processed to provide a speed evaluation method. With A horizontal rotary dryer, a method for drying an object to be processed, Formula 1, as the critical speed ratio defined by the formula 2 alpha is less than 30% to 100%, the rotating cylinder rotation to, drying the object to be processed. Vc = 2.21D α = V / Vc · 100 ··· Formula 2 Here, Vc is the critical velocity (m / s), D is the inner diameter of the rotary cylinder (m), alpha is the critical speed ratio (%), V is the rotational speed (m / s). .The 14