Types of screens are used in upgrading cleaned seeds

a) Width and thickness sizing and grading machines: Clipper corn sizer, Superior rock-it-corn grader, Dockins seed grader, Carter-day precision grader, Superior high-capacity sizer.

b) Length sizing and grading machines: Disc separator, Cylinder separator.

c) Gravity or weight separation machine: Gravity separators, Stoners.

d) Air separation machine: Pneumatic separators, Aspirators, Scalping aspirators, Fractioning aspirators.

e) Surface texture separation machine: Roll mill, Magnetic separators, Inclined draper.

f) electronic separation machine: Electric color sorter, electrostatic separators.

g) other separation machines: Spiral separator, Polishers, Picker belts, Vibratory separators.