PRODUCTION METHOD OF STATIC CHARGE IMAGE DEVELOPING TONER AND SCREEN DEVICE

摘要

A production method of static charge image developing toner capable of producing toner mother particles with good yield and efficiently and being excellent in image characteristics, image quality, scratch resistance of a developing device, and tone consumption, and a screen device capable of continuous screening without clogging. The production method of static charge image developing toner comprising the step of screening the dispersant of toner mother particles with a screen, characterized in that, when the above step is carried out, Y={1/(M<SUP>2</SUP>+r<SUP>2</SUP>+2Mr)}×10<SUP>8</SUP>×0.6 is satisfied assuming that the number of particles existing on the screen and having a size at least the mesh of the screen is Y (pieces/cm<SUP>2</SUP>), the mesh of the screed is M (µm), and the diameter of wire forming the screen is r (µm); a screen device characterized by having a screen wherein the shape of the minimum opening unit of the screen for passing particles in a still state varies when subjected to vibration during the screening step; a screen device characterized by having a screen onto which substantially no tension is applied; and a production method of static charge image developing toner using such a screen device.