PURPOSE: To measure accurately the humidity in the following room and to control it, by computing from three measured value of temperature of a vent hole part of an apparatus carrying out granulation, coating and drying through air, the temperature in a room of the granulation, coating and drying or that of an exhaust hole and absolute humidity of the air for drying.
CONSTITUTION: An intake 1 of air for drying and fluidization is provided with a thermometer 12 and a relative hygrometer 11 and a temperature TD of dried air and an absolute humidity HD, are measured in an apparatus for carrying out aeration type granulation, coating and drying using the air (the apparatus is not limited to the one which carries out the granulation, coating and drying at the same time). The dried air is heated by a heat exchanger 2 and its temperature is measured by an electrically temperature measuring element 8 before a vent hole 13 to a drying room. A material to be coated 4 is taken in a material to be coated housing container 3 of the drying room and a coating material is taken in from a spray gun 5. Then, a room temperature Tw is measured by a temperature measuring element 9 provided at the lower part of a wire net 6 in front of an exhaust hole 7 in the upper part of the room and the temperature of the elements 8, 9 is recorded on a temperature recorder 10. The humidity in the room is made known by a specified operational formula from the room temperature Tw, the temperature TD of the vent hole part and the absolute humidity HD and then, said humidity is controlled.
KATOU KEIICHI
MITSUNAGA TAKAYOSHI
UMETSU TADASHI
