What is PCR(Primary Charge Roller)

What is PCR?

The charging roller is an environmentally friendly charging device used in laser printers, copiers and other equipment. It replaces the traditional corona charging method with the contact charging method. Its core function is to transfer uniform charges to the surface of the photosensitive drum to generate electrostatic latent images, which directly affects the printing quality.

This device is composed of a metal core and a conductive elastic rubber layer. The outer layer is treated with a high-resistance surface coating and needs to have characteristics such as constant resistance and resistance to temperature and humidity changes. Compared with corona charging, the charging roller can reduce the ozone emission to 1/25000 of that of the traditional method, and the working voltage is reduced from 5000 - 8000V to 1500V. Meanwhile, it eliminates noise and reduces energy consumption. The main types include hard charging rollers, rubber rollers and polyurethane rollers, and the coating processes are divided into two categories: water-based and oil-based.

In recent years, technological innovations have focused on the design of detachable structures. Through dovetail joints, plug block components and so on, the conductive layer can be replaced separately, which prolongs the service life and reduces material waste. Processes such as the integrated molding of polyurethane conductors and nano-carbon composite materials have further improved the charge conduction efficiency and environmental adaptability. As a core component of the developing device, its application covers more than 80% of the laser printer market and is gradually expanding to the field of low-speed copiers.

Basic requirements: constant resistance value, no pinholes, good stability under high temperature and high humidity conditions, no precipitates, no corona discharge phenomenon (no whistling sound), no pollution to the drum core, no background gray in printing, no ghosting, and certain wear resistance.