1. Impurities remove
Impurities remove by screening machine is the first step for the whole process of oil extraction. Oilseeds often contains
impurities like bad oilseeds, shell, leaves, soil lump, stone, dirt, etc. When the materials mixed with impurities are fed into
the screening machine, a dust blower will vacuum the dust out of the machine, after which the materials will fall into a specific
gravity platform to remove mildewed oilseeds or oilseeds with worm holes according to weight density differences, in which step,
stones will be blocked out of the next step by a dam-board at the bottom the specific gravity platform, and then the materials
will be screened again by a vibrating screen plate to remove fine sand and broken oilseeds.