. Raffreddamento commerciale di frutta e verdura. Frutta; frutta; verdure. Fig. 12. Consigliato contenitore di cartone ondulato di sfiato ing pattern per la camera di raffreddamento. Con le dimensioni L x 3/2 L, e con sfiati centrata in corrispondenza di una distanza di L/4 da ogni angolo e L/2 oltre, sfiati saranno allineati quando i contenitori sono cross-impilati. effetto su quelli al centro della pila, essere- causa la differenza di temperatura tra l'interno della pila e la camera non produce alcun misurabile circolazione di aria attraverso la colonna di produrre. Schiuma di scatole di plastica forniscono circa lo stesso isolamento termico attraverso le loro pareti come fare due

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. Commercial cooling of fruits and vegetables. Fruit; Fruit; Vegetables. Fig. 12. Recommended corrugated container vent- ing pattern for room cooling. With dimensions of L x 3/2 L, and with vents centered at a distance of L/4 from each corner and L/2 apart, vents will be aligned when containers are cross-stacked. effect on those in the middle of the stack, be- cause the temperature difference between the inside of the stack and the room produces no measurable air movement through the column of produce. Foam plastic boxes provide about the same heat insulation through their walls as do the two layers of corrugated board in the walls of tele- scope containers. Cooling rates for foam plastic and 2-layer corrugated containers are about the same if the venting is the same. Vents of different shapes and sizes show no consistent differences in cooling rates if their total areas are equal. Vents less than l/g-inch across are less effective and should be avoided. Also, vents should not be of a size and shape that can be easily blocked by produce. Larger objects cannot close vents near the corners of a box, but vents near the corners seriously weaken corrugated containers. For best room cooling with corrugated con- tainers: • Avoid round vents if produce can be caught and block vent. • Use a few large vents instead of many small vents. • No top vents needed. • Vents should be l/^-inch wide or greater. • Keep vents 2 to 3 inches from all corners. • Vent area should exceed 2 per cent of the side area. • For cro»S-8tacking use vein arrangement il- lustrated in figure 12. Cooling in rail cars or trucks Total cooling in rail cars or in trucks has been largely abandoned except for a few commodities such as cantaloupes and celery. The trend to- ward cooling before loading is apparently due to growing appreciation of the importance of prompt cooling, to improvement and availabil- ity of other cooling methods, and to the dis- placement of ice by mechanical refrigeration

Parole chiave associate all'immagine

• bo
• bookcentury1900
• bookpublisherberkeley
• booksubjectvegetables