What is the purpose of sunflower oil pretreatment?

Sunflower oil making process as following:

Sunflower seeds pretreatment----sunflower seeds press------sunflower oil----sunflower oil extraction---sunflower oil refinery

Sunflower oil pretreatment machine

What is the purpose of sunflower oil pretreatment?
1.Sunflower oil pretreatment can improve the quality of the oil and the cake.
2.Sunflower oil pretreatment can increase rate of productivity and reduce residual oil.
3.Sunflower oil pretreatment can increase the capabilities of the equipment.
4.Sunflower oil pretreatment can lessens wear and lengthens the life of the equipment.
5.Sunflower oil pretreatment can ensure safety.