The main components are two counter-rotating hollow roll inward or drilling roller device in front of the operator side is called the roll, you can move through the manual or electrical operation level before, in order to adjust the roll gap, adapt operational requirements; After the roll is fixed, can not move back and forth. Two rolls generally the same size, each at different speeds relative rotation, raw rubber or plastic material with the rotation of the roller nip caught two strong shearing by mastication or mixing to achieve the purpose. Open mill is also used in plastics processing and other sectors. Open mill is open for short chain presses, plastic products factory, people are accustomed to call it two-roll machine. Open mill plastic products manufacturing plant application earlier a plastic mixing equipment. In the rolling machine production line, open mill before rolling machine, after mixing, the role is to mix the raw material mixing, plastics, providing mixed for calender calender molding plastic products more uniform mixing of molten plastic material. The production of cable materials, mixing function directly by a good mix powdered formula molded material refining of molten material, and then compression molded sheet with that cutter and cut into granules. In floor leather production line can be directly provided uniform mixing plastics primer for Burkina leather. Also the recycling of waste plastic film (film) at the mill and re-refining plastic back system.