Abstract: A temperature control method of a cut tobacco leaves drying apparatus having a rotary hollow cylinder around which a plurality of heaters are mounted and in which the cut tobacco leaves are dried while they are carried along the rotational axis of the cylinder toward the exit of the cylinder during the rotation of the cylinder.The method is capable of bringing moisture rate of the cut tobacco leaves to a desired value as fast as possible when they are dried for a period of time shortly after the cut tobacco leaves begin to flow into the drying apparatus.The heaters mounted on the cylinder are supplied heat with the amount of heat medium controlled independently of each other. Therefore the inner space of the cylinder defines cascaded drying-spaces of which the temperatures are controlled in response to a fow rate of the cut tobacco leaves flowing through the drying-spaces.

Abstract: A process for controlling the temperature of a drying apparatus including a cylindrical rotor having a plurality of heating means which are independent of each other and arrayed in an advance direction of raw material, the process comprises controlling the heating means in response to measurements of the flow rate and moisture content of the raw material charged into the rotor and measurements of temperatures of respective sections of the rotor, each section corresponding to each heating means so that the temperature of each section is changed in accordance with a flow rate characteristics curve of each section and controlling the heating means so that a bias temperature for compensating for a lag in thermal response dead time of each heating means is applied prior to changing the temperature of each section in accordance with a flow rate characteristics curve by a feed back controlling at least a final heating means in response to the measurement of the moisture content of the dried raw material discharged f

Abstract: A method of controlling the temperature of a drying machine by controlling the heat medium supply thereto in response to a signal representative of the temperature generated by a temperature detector for detecting the temperature of the drying machine comprising the steps of: supplying the heat medium to the drying machine for a period of time which is determined in accordance with an error signal between a reference signal corresponding to a preset target temperature range and said temperature signal and stopping the heat medium supply for a predetermined period of time after the lapse of the heat supplying period of time if said detected temperature does not reach at said predetermined target temperature range and change in temperature per unit time obtained from said temperature signal is equal to or lower than a predetermined value; stopping the heat medium supply if the detected signal does not reach at said target temperature range and said change in temperature per unit time is higher than said predete