Abstract
A new method to measure the adhesive strength distribution between toner and magnetic carrier particles has been developed. When a small amount of two-component magnetic developer is distributed on a piece of magnet, carrier particles are aligned in chains perpendicular to the wall surface, i. e. a magnetic brush is formed. This magnet is mounted in a rectangular airflow channel, 1mm high and 8mm wide, and then by increasing the air velocity at a constant rate, the toner particles are removed from the carrier particles. The quantity of toner particles entrained into the airflow is measured with a light scattering detector, and adhesive strength distribution is obtained from the relationship between the quantity of the particles entrained and the air velocity. The amount of sample required for the measurement is 20mg and the measurement time is 5min. In this research, chemical toner and pulverized toner were used, and the effect of the charge-to-mass ratio of the toner on the adhesive strength distribution was evaluated.
