Validating a Model-Based Ink Key Presetting System

A model-based ink key presetting system for offset presses was reported at TAGA 97. The system was centered on a steady-state inking system model which comprised the effects of the roller train, vibrators, overall system gain, and density-inkfilm thickness relationship. A number of press tests with specific plate designs were performed for determining the critical parameters of the model. The system was then implemented for ink key presetting based on the plate coverages for various printing jobs. This paper includes a review of the model, determination of the model parameters, results of presetting, and a discussion of issues for further enhancement of the presetting system.