Developer Particle Circularity and Additive Peeling Control

The patent changes the peeling rate parameter from the conventional high peeling (typically 50% or more) to a controlled low peeling rate of 30.6% or less. This parameter change is achieved through specific ultrasonic wave application conditions (frequency, power, time) and polyoxyethylene lauryl ether solution concentration (5%), which optimizes the fusion between external additive and mother particle while maintaining transferability and preventing excessive peeling during image formation

The patent introduces polyoxyethylene lauryl ether solution as an intermediary medium to facilitate the dispersion of developer particles and enhance the fusion between external additive and mother particle. The ultrasonic waves are applied to this intermediary solution, which acts as a carrier that enables effective energy transmission and uniform distribution, thereby improving fusion reliability while keeping the processing method relatively simple and scalable

The patent optimizes the average circularity degree parameter to a specific range (0.960 to 0.970) to achieve high transferability and image quality. This parameter optimization is accomplished through controlled pulverization and classification processes that efficiently produce particles with consistent near-spherical shapes, making the manufacturing process more predictable and easier to control while maintaining high image quality standards