Automated Color Test Value Definition in Offset Printing
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Solution Overview
Problem
Current certification processes for printing standards in lithographic offset printing are complex and time-consuming, particularly when converting wet-state color values to dry-state color values, requiring extensive waiting times for drying and repeated measurements across various paper, ink, and dampening solution combinations.
Innovation Solution
A method that involves using a test form with measuring elements and a color measurement strip to evaluate color deviations in the wet state, allowing for real-time correction via the ink control device, with a color measuring device evaluating substrates in-line or externally, and automated comparison in a computer to determine optimal ink settings before drying, reducing the process duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the traditional certification process is used with drying time, then accurate color measurement can be obtained, but the process time is excessively long
Solution Approach 1:
The patent applies preliminary action by measuring color values in the wet state before drying occurs, and then calculating the corresponding dry-state color values using pre-determined conversion relationships. This eliminates the need to wait for drying while still obtaining accurate dry-state color measurements, thereby resolving the contradiction between measurement accuracy and process time.
2Reliability
If multiple measurements are taken for different paper, ink, and dampening solution combinations, then comprehensive color control is achieved, but the complexity of the process increases
Solution Approach 1:
The patent applies parameter changes by converting the measurement state parameter from wet to dry using calculation relationships. Instead of physically drying multiple samples for different material combinations, the system measures wet-state values and transforms them to dry-state equivalents through predetermined conversion formulas, thereby maintaining comprehensive color control while reducing process complexity.
3Manufacturing precision
If repeated printing and measurement cycles are performed, then color tolerance requirements are met, but productivity is reduced
Solution Approach 1:
The patent applies mechanics substitution by replacing the physical drying process with a computational transformation. Instead of mechanically waiting for drying and performing repeated printing cycles, the system uses mathematical calculations to convert wet-state measurements to dry-state equivalents, thereby maintaining color tolerance compliance while significantly improving certification throughput.
Data Source
AI summary
A method sets the inking in a printing press with multiple ink zones in an inking unit of a printing unit. The method includes: printing a test form onto a printing substrate with an intentional pre-defined color deviation from the intended target color; correcting the previously set ink setting and the defined set color deviation with regard to the respective target value in the wet condition of the printing substrate by a color measuring device; and taking color measurements of the dried printing substrate using the color measuring device. The measured color values established in the dry state and the original of the test form in a computer are compared. The ink setting that belongs to the ink zone with the smallest deviation from the intended target color is used as the target ink setting for the printing process.