Material mixing, which is an important procedure in mold production, refers to a process in which external forces that change both in speed and direction move mold materials (including grinding material, binder and accessories) to evenly mix the grinding material and other materials and to evenly spread the binder on the surface of the grinding material. The more even the binder is spread on the surface of the grinding material, the more likely a high quality mold with even texture will be produced.