The oilseeds should be pretreated before pressing, and the quality of pretreatment effects the life performance, safety of machine directly as well as the oil output rate. The usual process including:

Selecting: Clear the mud and sand, stones and metals in the oilseeds through selecting. Oilseeds without careful selecting will speed up the wearings of the accessories, and can even lead to damage of the machine.
Shelling and Separating: In order to fully develop the machine’s production capacity and reduce the loss of the oil, raw materials with shells such as groundnuts, bancoulnuts, cottonseeds, and teaseeds, should be shelled, and shells and kernels should be pressed separately (cottonseeds should be off- velveteen).This is the necessary process.
Crushing and flaking: Teaseeds and beans(when cold pressing) can usually be pressed intactly. But the oil output rate would be much higher after crushing and flaking.
Roasting: The key factor of oil output rate is roasting, so it is said “70% lies in roasting, and 30% lies in pressing”. Water content and temperature of raw material should be controlled before pressing. It is suggested and requested that the user should master roasting technology in order to achieve idea economic benefits.