When the oil press is running, the processed raw material enters the press chamber from the hopper. It
is pushed inward by the screw of the snail, and squeezed. Because the material embryo is in motion in the press chamber of the oil
press, under the condition of high pressure in the press chamber, a great frictional resistance is generated between the material
embryo, the snail and the press chamber, causing the material to generate Friction produces relative movement.