Inkjet Color Transformation Table for Nozzle Defect Compensation
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Solution Overview
Problem
Inkjet printing machines face challenges with defective printing nozzles, which affect print quality due to deposits that reduce droplet volume and alter trajectory, and existing methods are not effective in compensating for nozzle fluctuations between maintenance cycles, especially in multicolor printing operations.
Innovation Solution
A method using a computer-generated color transformation table with optimized ICC profiles that includes replacement color combinations with minimal color distance, created by printing and measuring test charts, to proactively minimize the impact of defective nozzles on print quality, reducing sensitivity to nozzle failures and optimizing color transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maintenance cycles with intensive nozzle operation are carried out at regular intervals, then deposits in printing nozzles are reduced, but print quality is affected between maintenance cycles due to nozzle fluctuations
Solution Approach 1:
The system performs preliminary detection of nozzle defects before they significantly impact print quality. By continuously monitoring nozzle performance and identifying deviations from nominal behavior, the system can compensate for emerging defects proactively rather than reactively, maintaining print quality between maintenance cycles.
Solution Approach 2:
The system implements a feedback mechanism where actual print results are measured and compared against expected values. This feedback loop enables real-time detection of nozzle performance degradation and triggers compensatory actions or maintenance scheduling, bridging the gap between maintenance cycles.
2Loss of substance
If conventional color composition methods are used, then ink consumption is minimized, but the image impression becomes highly sensitive to fluctuations in nozzle throughput
Solution Approach 1:
The system dynamically adjusts color composition parameters based on detected nozzle performance. When nozzle throughput fluctuates, the system modifies ink proportions and color distribution parameters to compensate, maintaining consistent image appearance while adapting to changing nozzle conditions without excessive ink consumption.
Solution Approach 2:
The color composition system transitions from static, pre-defined ink ratios to dynamic, adaptive color management. The system continuously adjusts color parameters based on real-time nozzle performance data, enabling flexible compensation for nozzle fluctuations while maintaining ink efficiency.
3Adaptability or versatility
If the number of printing inks is increased to provide more degrees of freedom for color composition, then color flexibility is improved, but the complexity of managing nozzle defects increases
Solution Approach 1:
The system extracts and isolates the problem of nozzle defects by detecting and identifying specific defective nozzles individually. By separating the defect detection and compensation processes from the overall printing operation, the system can manage multiple ink channels and nozzle defects independently, reducing the perceived complexity despite using multiple inks.
Data Source
AI summary
A method for reducing the effect of defective printing nozzles in a multicolor printing process on an inkjet printing machine. A computer creates a color transformation table that, for every process color of the inkjet printing machine, includes a replacement combination of the respective other process colors with a minimum color distance to the process color in question. The color transformation table is used to compensate for a defective printing nozzle. The color transformation table is created by printing and measuring a test chart with all process colors and interpolated by the computer. The color transformation table is then optimized to avoid undesired transitions between supporting points of the color transformation table and the resultant color transformation table accordingly contains process color combinations with minimum sensitivity to defective printing nozzles and the optimized table is used to carry out the multicolor printing operation on the inkjet printing machine.