Planographic Printing Plate Precursor Stack Adhesion Prevention
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Solution Overview
Problem
Conventional photopolymerizable planographic printing plate precursors face inefficiencies due to adhesion and scratching issues when stacked without interleaf sheets, leading to reduced productivity and image quality.
Innovation Solution
A planographic printing plate precursor is developed with a support, a photosensitive layer containing a polymerizable compound, an oxygen barrier layer, and a protective layer with a filler, which prevents adhesion and scratches by matting the surface and blocking oxygen permeation, thereby enhancing curing reaction efficiency and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If planographic printing plate precursors are stacked without interleaf sheets to improve productivity, then the time required for removing interleaf sheets is eliminated, but adhesion between precursors and scratching of the photosensitive layer occur
Solution Approach 1:
The patent introduces a protective layer containing inorganic particles (such as silica, alumina, or titania) as an intermediary between the photosensitive layer and the support. This protective layer acts as a mediator that prevents direct contact and adhesion between stacked precursors, while also providing a matting effect that prevents scratching during handling and exposure, thereby enabling stackable storage without interleaf sheets
Solution Approach 2:
The patent modifies the surface properties of the support by forming a protective layer with specific inorganic particles that change the friction and adhesion parameters. The inorganic particles create a rough, matting surface that reduces contact area and adhesion force between stacked precursors, allowing them to be stacked directly without interleaf sheets while preventing both adhesion and scratching
2Reliability
If a protective layer with filler is added to prevent adhesion and scratching, then reliability is improved, but device complexity increases
Solution Approach 1:
The protective layer containing inorganic particles serves multiple functions simultaneously: it prevents adhesion between stacked precursors, provides a matting effect to prevent scratching, and enhances the overall durability of the printing plate precursor. By combining these functions into a single layer, the patent avoids the need for multiple separate layers or components, thereby limiting the increase in device complexity
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 adhesion and scratches between stacked precursors, improves exposure efficiency, and ensures high-quality image formation without defects, even when stacked without interleaf sheets.
Implementation Method 1
an oxygen barrier layer, and a protective layer including a filler formed in this order on or above the support
Implementation Method 2
a photosensitive layer containing a polymerizable compound
Data Source
AI summary
The present invention provides a planographic printing plate precursor, including: a support; and a photosensitive layer containing a polymerizable compound; an oxygen barrier layer; and a protective layer containing a filler (preferably an organic resin particle), the layers being formed in this order on the support. The present invention also provides a stack of planographic printing plate precursors, produced by stacking the planographic printing plate precursors with the photosensitive layer side outermost layer and the support side rear surface of the adjacent plate precursor in direct contact with each other.