Abstract: A roll mill for a milling-dispersing treatment has a fixed roll fixed to a frame, and a transfer roll displaceable into and out of contact with the fixed roll in a direction perpendicular to the fixed roll by a servomotor and a ball screw. A laser sensor disposed between the fixed roll and the transfer roll measures the distance between the rolls, and a load sensor measures a pressing force between the rolls. An electronic automatic control device maintains a constant distance and a constant pressing force between the fixed roll and the transfer roll by feedback of detection signals sent from the respective sensors, wherein the servomotor is driven by the electronic automatic control device to adjust the position of the transfer roll.

Abstract: A roll mill for a milling-dispersing treatment has a fixed roll fixed to a frame, and a transfer roll displaceable into and out of contact with the fixed roll in a direction perpendicular to the fixed roll by a servomotor and a ball screw. A laser sensor disposed between the fixed roll and the transfer roll measures the distance between the rolls, and a load sensor measures a pressing force between the rolls. An electronic automatic control device maintains a constant distance and a constant pressing force between the fixed roll and the transfer roll by feedback of detection signals sent from the respective sensors, wherein the servomotor is driven by the electronic automatic control device to adjust the position of the transfer roll.

Abstract: A material to be treated containing solid particles in a liquid is stirred together with milling media, and irradiated with ultrasonic waves during stirring to finely mill the solid particles to nanometer size and disperse the solid particles in the liquid. The ultrasonic waves create cavitation in the liquid and upon decay of the cavitation, shock waves are produced that cause the solid particles to vigorously collide with one another and with the milling media and these collisions, together with the shearing forces created by collision of the milling media, can produce on a commercial scale nano particles having an average particle size of at most 100 nm.

Abstract: A material to be treated containing solid particles in a liquid is stirred together with milling media, and irradiated with ultrasonic waves during stirring to finely mill the solid particles to nanometer size and disperse the solid particles in the liquid. The ultrasonic waves create cavitation in the liquid and upon decay of the cavitation, shock waves are produced that cause the solid particles to vigorously collide with one another and with the milling media and these collisions, together with the shearing forces created by collision of the milling media, can produce on a commercial scale nano particles having an average particle size of at most 100 nm.