Potatoes are one of the most important vegetable crops in Brazil, and are especially important in São Paulo State. After harvesting, potatoes are sorted and classified in a packinghouse, then shipped to consumers. The goal of this research was to describe the main features and working systems used in a potato packing line. Therefore, the material type used was identified taking into account the dimensions of the equipments, brushes rotation on receiving belts and sorting lines, average velocity, tuber displacement velocity and rotation, and employee daily yield. The critical points for drop impact were measured using an instrumented sphere (70 mm), Techmark, Inc. Lansing, Michigan, USA. Results for maximum Acceleration (G) and velocity changes (deltav) were found. This research was done in five packinghouses of São Paulo State. A variation occurred in length among the lines, of about 26,5%. The water consuption varied among the units based on the washing system used, and volume dispended varied from 15,4 to 168 thousand liters/hour. The main brushing composition used on the washing brushes were nylon and coconut fiber, and brushes of animal origin were not used. The average rotation observed on the washing step was 157 ppm, with a variation of 75% (112-196 rpm). For the drying step, the average rotation was 122 rpm, varying from 68 to 210 rpm. The critical points that showed high G were the transfer points (washing entrance and packing). At units A, B and C the high G values were at the initial washing steps, closely to 140 G (m/s²).
Solanum tuberosum L; sorting; packing line washer; instrumented sphere; tuber quality
