Abstract - Charge Roller Testing: Fundamentals and Practice
This presentation describes the design, charging mechanisms and functional requirements of charge rollers and introduces an advanced dielectric relaxation analysis (DRA) system employing electrostatic charge decay (ECD) technology to test charge rollers and other semi-insulating EP components. It discusses the limitations of conventional measurement techniques and demonstrates the reliability and practicality of the non-contact ECD approach for predicting charge roller performance.
A case study of OEM and aftermarket charge rollers demonstrates how charge transport performance affects print quality. The study uses the DRA system to measure dielectric relaxation; a drum test system to measure OPC voltage with the same set of rollers; and a hand-held image analysis system to correlate the electrical results with print quality. The study demonstrates the utility of the DRA system for roller development, production QC, recycled component testing and problem-solving in a wide variety of applications.
