Experimental Drying Equipment for Alimentary Pastes

An apparatus is described whereby the experimental drying of alimentary pastes may be conducted automatically under a pre-determined program of temperature, time and humidity relations.The air employed for drying is continuously recirculated, dehumidification being obtained by by-passing an increasing proportion over refrigerating coils through the medium of an especially designed valve, operated electromagnetically and timed by an electric clock.Complete control of the time-humidity relation is obtained by a regulated steam input from a water resistance boiler controlled by the action of the wet bulb recording pen in conjunction with a conducting strip placed on the recorder chart.While specifically designed for drying alimentary pastes, the apparatus should be well adapted to other classes of drying studies and may also be employed to maintain constant conditions of temperature and humidity.