Printing Press Color Control Using Roller Gap Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for controlling color characteristics in printed images struggle to accurately adjust ink delivery and roller pressures to achieve desired color accuracy and quality, leading to deviations and defects in printed designs.
Innovation Solution
A system and method that vary control factors such as roller distance and ink viscosity in printing stations to control color characteristics by using a Control Factor to Color Model (CfCM) to determine the required adjustments based on measured color deviations, ensuring accurate color reproduction and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink delivery is adjusted by controlling ink keys, then color accuracy is improved, but the system cannot address roller pressure variations affecting color consistency
Solution Approach 1:
The system changes the control parameter from ink key position to roller gap distance. By measuring the actual roller gap and comparing it to the target gap, the system calculates the required ink delivery adjustment to compensate for pressure variations, thereby maintaining color accuracy despite mechanical variations
Solution Approach 2:
The system replaces direct mechanical control of ink keys with a computational approach. A processor calculates the required ink adjustment based on measured roller gap deviations, substituting mechanical intuition with mathematical modeling of ink transfer characteristics
2Manufacturing precision
If roller pressure is increased to improve ink transfer, then color consistency is improved, but dot gain and image quality deteriorate
Solution Approach 1:
The system implements a feedback loop where the actual roller gap is measured, compared to the target gap, and the deviation is used to calculate the necessary ink delivery compensation. This closed-loop control prevents both under-inking and over-inking that would result from fixed pressure settings
Solution Approach 2:
The system makes the ink delivery system dynamic by continuously monitoring roller gap and adjusting ink compensation in real-time. This allows the system to adapt to varying roller pressures without manually changing mechanical settings, optimizing ink transfer at each moment
3Manufacturing precision
If manual adjustment of roller pressure is performed, then color accuracy is improved, but time consumption and productivity decrease
Solution Approach 1:
The system performs self-adjustment by automatically measuring roller gap, calculating the required compensation, and applying the correction without operator intervention. The printing press self-corrects for roller wear and mechanical variations, eliminating manual calibration time
Solution Approach 2:
The system performs preliminary measurement of the roller gap before printing and pre-calculates the required ink compensation. This advance preparation allows the printing process to proceed immediately with corrected settings, avoiding downtime for manual adjustment
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A method for controlling the color in a printing press, which includes at least one printing station printing a respective color design. The method includes the procedures of determining a control factor to color model, printing a design on a web and acquiring color characteristics corresponding to the printed design on the web. The method further includes the procedures of determining the color quality of the printed color design and determining a required change to at least one control factor when a correction to the color characteristics of the printed design is required. The change to at least one control factor is determined by determining the at least one control factor with respective color related information, which results in a reference color characteristic, according to the control factor to color model. The method returns to the procedure of printing when a correction is not required.