Planographic Printing Plate Precursor Edge Stain Prevention
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Solution Overview
Problem
Planographic printing plates experience edge stain and adhesion issues during newspaper printing, particularly when using on-press development methods, due to ink transfer from the plate's end portions onto the paper, and existing solutions either fail to adequately prevent edge stain or cause adhesion problems with interleaving paper.
Innovation Solution
A planographic printing plate precursor with a support and an image recording layer, where a water-soluble compound with a molecular weight of 60 to 300 and solubility of 10 g/L or greater is applied in higher concentrations near the end portions, preventing edge stain and adhesion by enhancing dampening water permeability and using specific compounds like polyols, betaines, and phosphoric acid compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a treatment solution containing organic solvent and hydrophilic resin or surfactant is applied to prevent edge stain, then edge stain is reduced, but adhesion to interleaving paper occurs and the water width becomes narrow
Solution Approach 1:
The patent changes the chemical parameters of the treatment by using water-soluble compounds with specific molecular weights (60-300) and solubilities (10 g/L or greater), replacing the conventional organic solvent-based treatments. This parameter change maintains edge stain prevention while avoiding adhesion to interleaving paper and preserving adequate water width for stable printing
Solution Approach 2:
The patent applies different concentrations of water-soluble compounds to different regions of the printing plate. Specifically, the compound is applied in higher concentrations near the end portions (first region) and in lower concentrations in other areas (second region), creating local quality differences that prevent edge stain at critical areas while maintaining overall printing stability
2Object-affected harmful factors
If water-soluble compound with higher concentration is applied near end portions to prevent edge stain, then edge stain and adhesion are prevented, but the complexity of the treatment process increases
Solution Approach 1:
The patent implements local quality by concentrating the water-soluble compound application in the first region (near end portions) at higher levels than the second region. This targeted approach prevents edge stain and adhesion at critical areas while avoiding unnecessary treatment complexity across the entire plate surface
Solution Approach 2:
The patent simplifies the treatment process by changing from complex organic solvent and surfactant mixtures to water-soluble compounds with defined molecular weight and solubility parameters. This parameter standardization reduces treatment complexity while maintaining effectiveness
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 solution effectively prevents edge stain and adhesion to interleaving paper, ensuring a wider water width for stable printing and maintaining the quality of printed materials.
Implementation Method 1
enhancing dampening water permeability
Implementation Method 2
preventing adhesion to interleaving paper
Data Source
AI summary
Provided are a planographic printing plate precursor for furnishing a planographic printing plate in which edge stain does not occur, adhesion to interleaving paper is prevented, and the water width with respect to edge stain at the time of printing is wide; a method of producing the same, and a printing method using the same. The planographic printing plate precursor including: a support; an image recording layer formed on the support; and a water-soluble compound having a molecular weight in a range of 60 to 300 and a solubility of 10 g/L or greater in water at 20° C., in which a content of the compound per unit area in a region 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 a content of the compound per unit area in a second region other than the first region by an amount of 50 mg/m2 or greater.