... ball press machine: 1, Round, square, oval and any shape can be custom-made; 2, Test at workshop with the customer. Coal , Ball ... machine can press the raw materials for pelletize or press ball, such as coal dust, aluminum powder, active carbon, ... clay ,braize ,coal, cryolite, chemical fertilizer, plastic, lime stone, pigment, urea, etc. 2,Ball Forming Machines working Principle This series of type ...