Lithographic Printing Plate Processing with Basic Coloring Matter
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Solution Overview
Problem
The on-press development method for lithographic printing plates faces challenges in preventing ink contamination and ensuring proper image quality control, especially when the printing plate has minimal colorant and lacks absorption in the visible region, making it difficult to confirm image registration and calibration.
Innovation Solution
A method involving an aqueous solution with a basic coloring matter, such as Crystal Violet or Methylene Blue, is used to stain the image recording layer, allowing for plate inspection and quality control, while minimizing ink contamination and enabling effective image registration and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the printing plate uses minimal colorant to prevent ink contamination, then ink contamination is reduced, but image quality control and registration become difficult
Solution Approach 1:
The patent introduces a basic coloring matter (such as Crystal Violet or Methylene Blue) that stains the image recording layer in the image area. This coloring matter provides visible coloration that enables inspection and quality control without interfering with the printing function, thus resolving the contradiction between minimizing ink contamination and maintaining detectability for registration and calibration.
Solution Approach 2:
The basic coloring matter acts as an intermediary substance that allows visual detection and inspection of the printing plate. It mediates between the need for minimal colorant to prevent ink contamination and the need for sufficient coloration to enable registration and calibration, by providing a stable, non-interfering stain that persists through the printing process.
2Manufacturing precision
If conventional development methods are used, then image recording layer removal is effective, but wet processing and waste treatment requirements increase
Solution Approach 1:
The patent replaces the conventional wet chemical development process with a dry processing method using a printing press. Instead of using alkaline developers or organic solvents to remove the image recording layer, the invention uses mechanical pressure and heat from the printing press to achieve the same result, thereby eliminating wet processing and waste treatment requirements.
Solution Approach 2:
The invention changes the processing parameters from chemical (pH, solvent concentration) to physical (pressure, temperature). By using the printing press's mechanical action and heat instead of chemical developers, the patent achieves effective removal of the image recording layer without requiring wet processing, thus simplifying the overall process and eliminating waste treatment needs.
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
The method facilitates enhanced plate inspection and image quality control, reduces paper loss, and ensures accurate image registration and calibration by utilizing a basic coloring matter in the aqueous solution to stain the image area, thereby improving the printing process.
Implementation Method 1
a compound capable of interacting with a basic coloring matter... when a compound capable of interacting with a basic coloring matter is added to the image recording layer and brought into contact with an aqueous solution containing a basic coloring matter
Data Source
AI summary
A method for processing a lithographic printing plate precursor, the method comprising: imagewise exposing a lithographic printing plate precursor, so as to form an exposed lithographic printing plate precursor; and then bringing the exposed lithographic printing plate precursor into contact with an aqueous solution containing a basic coloring matter, wherein the lithographic printing plate precursor comprises: a support; and an image recording layer containing a compound which interacts with a basic coloring matter and being removable by at least one of a printing ink and a fountain solution; methods for plate inspection and image quality control of a lithographic printing plate precursor, using the processing method; and a basic coloring matter-containing aqueous solution used for the processing.