Patent ID: 6325854
Filing Date: 2001-12-04
Classification: B05B,B05D

Abstract:
An apparatus for controlling an amount of electric charge on a finely divided powder, comprising:a gas supplying source;a dew-point controller for controlling the dew-point of the compressed gas supplied from the gas supplying source to a prescribed dew-point of 0.degree. C. or less;a dew-point hygrometer for measuring the dew-point of the compressed gas having passed through said dew-point controller;a finely divided powder transportation pipe for transporting the finely divided powder in a discrete particle state by a stream of the compressed gas which has passed through said dew-point hygrometer and whose dew-point has been controlled; anda finely divided powder supplying device for supplying the finely divided powder into said finely divided powder transportation pipe in a substantially discrete particle state,wherein the amount of electric charge produced by friction on the finely divided powder by the collision thereof against the inner wall of said finely divided powder transportation pipe is controlled in accordance with the dew-point of the compressed gas.