1. When oil press is on work, material enters the extruding chamber from the hopper and then moves forwards by the rotating pressing screw and is pressed.
2. Under high temperature condition in the chamber, there is quite strong friction among press screw, chamber and the oil materials.
3. On the other hand, root diameter of the pressing screw carries larger from one end to the other. Hence when rotating, the thread not only pushes particles moving forwards but also turns them outwards as well.
4. Meanwhile, particles adjacent the screw will rotate along with screw’s rotating, causing every particle inside the chamber to possess different speed.
5. Therefore, relative movement among particles creates neat which is necessary during manufacturing because of helping protein change property, damage colloid, increase plasticity, decrease oil’s elasticity, resulting in high oil.
