1. Automatic, simple to operate. 2. The head of grinder has screw thread which is convenient to Control the length of paper tube. 3. Unload by cam, which can ensure the stability of the paper tube''s length . Main technical parameters: Rubbing tube diameter :50-150mm Thickness :3-20mm Rubbing tube length :50-350mm Speed: 18-40/min Working atmospheric pressure :0.3-0.5mpa Way of send and unload the material :automatic Outward appearance size: 2000.1200.1400mm Number of operator:one Power :3.380