... , manufacturing and accessories for machine USE: YX-670 three layer plastic sheet extruding machine was designed and make by absorbing & digesting advanced ... at home and abroad. It is mainly used to produce plastic sheet of PP, PS, PE, HIPS, they are the materials for ... the extrusion unit; 2. Screw, die head and crust are made of high quality of alloy steel with optimum hardness, strong ...