Ink Presetting
The objective of the presetting system is to achieve uniform target density across the print as quickly as possible after start-up. To accomplish this, other variables that affect proper key setting must be controlled. Ink key zero settings must be properly calibrated in order for the calculated key settings to accurately produce the expected blade opening. Fountain lock-ups must consistently close the fountain to the same position each time in order for zero settings to be accurate. Micro rollers, if used, must be set parallel and within manufacturers specifications for gap. Other variables that effect ink key settings at start-up, such as ink ball speed, ductor settings, and water settings, must be standardized or under control of the presetting software. In addition, the proper non-linear curves or formulas for converting percent coverage to key setting must be determined, a process determined by the system you choose. To maintain optimum preset results, periodic evaluation of preset performance is required.