Latest Technology in Thin Film Measurement

摘要

In order to increase the productivity of the WEB coaters and to reduce scrap, a real time online monitoring system is required. Such a system will enable an operator to detect all quality relevant deviations in an accurate and immediate way. Thus necessary corrections can be accomplished and supervised without delay. Today, most WEB coating machines are equipped with monitoring systems to measure and control the metal layer thickness and homogeneity. However, these systems usually measure the optical density or sheet resistance only at few fixed positions across the film width. In addition, the measurement frequency is low. Therefore, only little information is available to control the coating thickness homogeneity.