Period of Drying. - The time required to dry tea varies with temperature and load. The volume of air employed also affects it.According to experimental evidence it takes approximately twice as long to fire a tea at 160°F as to fire it at 190°F, loadand air flow remaining constant. If the load is halved for the lower temperature, the time of firing is the same in each case. At higher temperatures the rate of loading can be proportionately increased to give the same moisture content in the made tea; or by having a set load the period of drying can be shortened. The relationship between these variables, keeping two factors constant, for three levels of temperatures is shown in Table XVIII.
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