By R. C. Balls ANCAE (auth.)
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Here they can be accurately graded, without being carried beyond their sizing point by the flow of the rest of the product. Capacity varies between 250-350 kgjh for tomatoes or other delicate objects and 1 tonnejh for root crops, for each roller unit in the grader. 6 Parallelbelt Diverging belts have limited accuracy because it is difficult to choose the exact point where each grade starts and ends, and the object might not be rotated to its minimum dimension by the grade change . The parallel belt is more accurate since the gap is constant, and an object is correctly sized anywhere along the belt where it is orientated to its ..
The chute angle and fruit flow are arranged to allow a single layer to amass at the lower end of the chute, so that the lowest row is continually carried away by becoming lodged in the tray dep ressions . The chute is oscillated gently to help fru it flow and to aid its distribution into the depressions. The filled trays move to a pos ition from which an operator can place them in the outer box. On current machines the trays are also placed manually, but automatic destackers and loaders are under development.
The sleeve is loosely held, so that the produce weight draws the net off the tube ; its descent is halted at a point where the top of the net can be gathered . The clipping head is activated by each filled bag end dropping away from the tube end. The tube holding the net sleeve is detachable from the pre-packer, so that it can be replaced by another when its net is exhausted, and the empty one refilled without loss of runn ing time. 38 Horticultural Engineering Technology The polyethylene sleeve unit works in a similar manner, except that it is heat sealed into a flat end, rather than being bunched.