Fountain Solution Thickness Control via Diagnostic Image Analysis
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Solution Overview
Problem
Conventional lithographic printing systems lack an accurate method to quantify the amount of fountain solution used in offset lithography, leading to undesirable image distortions due to either too much or too little fountain solution.
Innovation Solution
A digital offset lithography printing system that uses a processor and storage device to receive fountain solution control values, print diagnostic images, analyze image density, and derive a window of fountain solution control values to optimize the solution thickness, thereby minimizing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fountain solution control values are manually set based on operator experience, then the system is easy to operate, but the manufacturing precision of image quality deteriorates due to inability to accurately quantify and optimize fountain solution thickness
Solution Approach 1:
The system prints diagnostic images with varying fountain solution control values, analyzes the optical density of printed patches, and uses the analysis results to automatically determine optimal control values. This closed-loop feedback mechanism enables precise quantification of fountain solution thickness and optimization of image quality without requiring manual operator judgment.
Solution Approach 2:
The patent replaces manual operator experience and judgment with an automated optical analysis system. The system uses optical density measurements and processor-based analysis to objectively determine optimal fountain solution control values, substituting the subjective mechanical process of operator adjustment with an automated optical-mechanical system.
2Manufacturing precision
If fountain solution thickness is not accurately controlled, then the system is simple to operate, but image distortion occurs due to too much or too little fountain solution
Solution Approach 1:
The system performs self-diagnosis and self-optimization by automatically printing diagnostic images, analyzing optical density patterns, and determining optimal fountain solution control values without requiring external operator intervention. The system serves itself to identify and correct fountain solution thickness issues, ensuring sharp images while simplifying operator tasks to merely initiating the optimization process.
3Manufacturing precision
If diagnostic images are printed and analyzed to determine optimal fountain solution control values, then the manufacturing precision of fountain solution thickness is improved, but the loss of time for additional printing and analysis occurs
Solution Approach 1:
The system uses a limited set of diagnostic control values (e.g., five predetermined values) to print a small number of diagnostic images for analysis. By testing only specific critical values rather than exhaustively testing all possible control settings, the system achieves effective optimization with minimal additional printing and analysis time.
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 allows for precise control of fountain solution thickness, ensuring clear and sharp images by determining the optimal range of fountain solution application, thus improving image quality and operational efficiency.
Implementation Method 1
An imaging system then evaporates regions of the fountain solution layer in an image area by exposure to a focused radiation source (e.g., a laser light source, high power laser) to form pockets.
Implementation Method 2
exposure to a focused radiation source (e.g., a laser light source, high power laser)
Data Source
AI summary
According to aspects of the embodiments, there is provided a method of determining the amount of fountain solution employed in a digital offset lithography printing system. Fountain solution thickness is determined from diagnostic images that are printed and analyzed using the existing Image Based Controls (IBC). An analysis of the density of solids, halftones, and background as a function of the fountain solution control parameter is performed to decide on the appropriate level of fountain solution. A latitude window of control parameters is then derived for which the digital offset lithography printing system in operation minimizes the undesirable effects of too much or too little fountain solution.