The raw meal powder is made into a ball core with uniform particle size, and then sent into the ball disc. After the ball core enters the ball disc, it is subjected to centrifugal force, friction force and gravity in the disc, moves along a parabola, and is continuously rolling. The water in the ball is continuously squeezed out of the surface. Due to the cohesiveness and plasticity of the material, the core of the ball and the raw meal powder adhere to each other during the movement and gradually grow up.
