features of oill press 1.it can save 60% labor for the equal output 2.pure oil quality 3.occupiess less space 4.widely used The screw oil press is composed of electric appliance control, hot pressing, adjustment, driving and vacuum oil filter. The squeezing bolt is made of alloy steel treated by carburization to improve it’s hardness wear resistance, squeezing bolt are grinded by surface grinder ...