A key stage in preparing onions for sale is sorting them into the appropriate size fractions. Before grading, the onion tops must be removed.

Onions taken from storage are fed into a dosing bunker integrated with the KD-M box pallet tipper (1). The bunker ensures continuous and even feeding of the product onto the processing line. Through an intermediate conveyor (2), onions are transferred to the OM-3 onion topper (3). The trimmed onions are then directed to the first belt grader with a 36×36 mm sorting belt (4). The fraction with a diameter of up to 36 mm is sent to a box pallet (5), while the remaining product is directed to the second belt grader (6), which uses a 50×50 mm belt to separate the product into 35–50 mm (7) and over 50 mm (8) fractions.