Studies on the Technique During the Distribution Process of Citrus Unshu (Part I):Improvement of the Drying Process of Sorting Equipmet

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The drying process of Citrus Unshu which follows the water-washing and waxing processes. was investigated and the following results were obtained.1. The mean air velocities over the net-convyer were 2.22m/s at the present equipment and 1.33m/s at the improved one.2. The amount of water adhered to citrus during the present washing process weighed 0.3 to 0.4 grams for Citrus Natsu and 0.08 grams for Citrus Unshu.Removal of the water during the drying process was not sufficient in either citrus.3. The water removed from the surface of later-ripened Citrus Unshu, during drying process was 61.4 percent at the present-type-apparatus and 75.9 percent at the improved one, and 78.4 percent and 91.8 percent respectively when including the process of wax-drying, The effect of improvement was perceived.4. Difference in quality of products was not detected between present-type-equipment and improved one. Waxing had a tendency to decelerate the decay of early-ripened Citrus Unshu, whereas to accelate the decay of later-ripened one.5. When the wetted Citrus Unshu was dried by heated air, the result was given as the following.Q=W0(1-e-ct)whereQ: weight of evaporated moisture (kg)W0: initial weight of water adhered to product (kg)t: hour (h)c: drying constant (kg/kg′·h)
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