Lithographic Printing Plate Edge Stain Prevention
Solution Overview
Problem
Planographic printing plate precursors experience edge stain and image layer transfer issues when stored stacked, leading to contamination of exposure machines and printing press components.
Innovation Solution
A planographic printing plate precursor design with increased fine particle content in the end portion regions, specifically a 10 mg/m² or greater difference in fine particle content per unit area from the end portion to 5 mm inside, prevents edge stain and image layer transfer by enhancing the edge stain prevention properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a treatment is performed on the end portions using a solution containing organic solvent and hydrophilic resin, then edge stain is improved, but the image recording layer peels off and transfers to the rear surface of the support when plates are stored stacked
Solution Approach 1:
The patent applies different fine particle contents to different regions of the printing plate. Specifically, the end portion region (within 5mm from the end) has a fine particle content that is 10mg/m² or more greater than the non-end portion region. This local differentiation allows the end portions to have enhanced properties that prevent both edge stain and image layer transfer, while the main printing areas maintain their original functionality.
2Reliability
If fine particle content is increased in end portion regions, then edge stain prevention and image layer stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the parameter of fine particle content to resolve the contradiction. By increasing the fine particle content specifically in the end portion region by 10mg/m² or more compared to the non-end portion, the patent achieves improved reliability for edge stain prevention and image layer stability. This parameter change can be implemented through controlled coating processes during manufacturing.
Data Source
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AI summary
Provided is a planographic printing plate precursor including: a support; and an image recording layer formed on the support, in which the content of fine particles per unit area in a region on a plate surface on the image recording layer side from an end portion of the planographic printing plate precursor to a portion inside the end portion by 5 mm is greater than the content of the fine particles per unit area in a region other than the region by an amount of 10 mg/m2 or greater, edge stains are not generated therein, and transferring of the image recording layer is prevented even in a case where planographic printing plate precursors are stored in a stacked state. Further, provided are a method of producing the same and a printing method using the same.