Printing Press Ink Regulation via Zone Density Correlation
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Solution Overview
Problem
Existing color control methods in printing presses are not effectively automated to ensure active control only in relevant operating states, leading to potential destabilization of the control behavior and unnecessary interruptions during the printing process.
Innovation Solution
Implementing a condition-based automatic color control system that checks the plausibility of measured color density values across adjacent zones, ensuring only stable and plausible values are used for control, and delaying active control until the printing process reaches a stable state, thereby preventing brief disturbances from affecting the control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic color control is continuously active during the entire printing process, then color control precision is improved, but control stability deteriorates due to brief disturbances during startup and operation changes
Solution Approach 1:
The control system dynamically adjusts its operational state based on printing conditions. During startup and operation changes, the system transitions to a monitoring-only state without active control intervention. Once stability criteria are met, it switches to active color control mode, making the control behavior adaptive to different operational phases
Solution Approach 2:
The system continuously monitors color density values and compares them against stability criteria to determine when active control should be activated or suspended. This feedback mechanism prevents control intervention during unstable periods while enabling precise control during stable operation
2Measurement precision
If color control is activated during unstable printing states, then color control precision is improved, but control behavior becomes unstable due to brief singular disturbances
Solution Approach 1:
The system performs preliminary monitoring of color density values during startup and operation changes to assess stability before activating color control. By evaluating stability criteria in advance, the system ensures that control intervention only begins when conditions are favorable, preventing premature control activation during unstable states
Solution Approach 2:
The system prepares for potential disturbances by implementing a stability assessment phase before active color control. This preliminary monitoring period acts as a buffer that protects the control system from brief singular disturbances, ensuring reliable control behavior when activated
3Stability of the object's composition
If automatic color control is suspended during stable operation, then control stability is maintained, but manufacturing precision deteriorates due to lack of active control
Solution Approach 1:
The control system dynamically transitions between monitoring-only mode and active color control mode based on real-time stability assessment. During stable operation, it activates precise color control to maintain high manufacturing precision, while suspending control only during inherently unstable phases like startup and operation changes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes the control behavior of the printing press, ensuring high-quality output by filtering out singular disturbances and maintaining efficient operation, thus avoiding unnecessary interruptions and ensuring accurate color control.
Implementation Method 1
at least one detection device (11) with at least one sensor (24) directed onto a surface of a printing material (09) printed in the printing press detects the quality of the print
Data Source
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AI summary
The invention relates to a method for regulating the ink in a printing press, in which a stock (09) is continuously printed in an on-going printing process of the printing press, at least one ink is applied to the stock (09) in several inking zones (22; 22A; 22B; 22C; 22D), a measured value indicating an ink density is determined for the at least one ink applied to the stock (09) in said printing process within the printing press, and a relation is formed between the measured ink density value for a specific ink in a selected inking zone (22; 22B) and a measured ink density value determined for the same ink in at least one other inking zone (22; 22A; 22C). The relation between the measured ink density values in different inking zones (22; 22A; 22B; 22C; 22 D) is formed only if the majority of the inking zones (22; 22A; 22B; 22C; 22D) of a specific inking unit (07) of the printing press supply one respective measured ink density value for an ink supplied by said inking unit (07), said measured ink density value reaching at least a predefined fraction of a preset desired value in the respective inking zone (22; 22A; 22B; 22C; 22D).