Fuel oil is squeezed out of the process:

When the fuel into the oil press virgin bore, with the oil equipment chamber rotates, the pressure increases. As the seed material extruded continuously squeezing oil, virgin material particles in direct contact with each other and cause a pressure deformation of seed machine for pellets, particularly in the oil film rupture and the adhesive body. Such bombing bore after being squeezed, squeezed material is not a loose body to form a plastic body, called the cake. Squeeze due to the dual role of temperature and pressure, will continue to deteriorate protein, thereby affecting virgin plastic material, in short, in order to ensure an appropriate level of protein denaturation best squeeze out the oil effect.