| 摘要 |
<p>The invention relates to a method of grading crops such as bulbous and tuberous crops according to square size into a number of grades using a grading plant comprising a plurality of rollers (30, 31, 32) of corrugated profile mounted in a frame in spaced parallel relation, in which the dips of the profile of two successive rollers facing each other form a plurality of substantially square passageways, the rollers in operation are driven for rotation, and the crops to be graded are fed to the grading plant in a direction substantially transverse to the longitudinal direction of the rollers (30, 31, 32). According to the invention a grading plant is used in which the rollers that correspond to one and the same grade are each shifted in their longitudinal direction relatively to the adjacent rollers over a relatively small distance (A) in comparison with the situation where the respective dips and tops of the corrugated profiles are arranged exactly directly opposite each other.</p> |
