Protective Layer Design for Planographic Printing Plate Misfeeding
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Solution Overview
Problem
Planographic printing plate precursors face challenges in preventing multiple plates from being fed incorrectly, projections on the surface from falling or causing scratches, and development delays when interleaving paper is not used, as existing solutions fail to simultaneously address these issues effectively.
Innovation Solution
A planographic printing plate precursor is designed with an aluminum support and an image recording layer, along with a protective layer that is at least 0.2 µm thick, ensuring a Bekk smoothness of 1000 seconds or less on the outermost surface, which prevents plate misfeeding, projection falling, and scratches, while maintaining development efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaving paper is inserted between planographic printing plate precursors to prevent dislocation and adhesion, then the precursors are protected during stacking and transportation, but the cost increases and disposal treatment is required, and the interleaving paper must be removed before exposure which adds load to the plate-making step and risks peeling failure
Solution Approach 1:
The invention extracts and eliminates the interleaving paper from the system by providing a protective layer with specific properties (inorganic layered compound or silica-coated organic resin particles) that enables direct lamination without interleaving paper, thus removing the need for paper insertion and subsequent removal steps
Solution Approach 2:
The invention replaces the disposable interleaving paper with a permanent protective layer integrated into the printing plate precursor structure, eliminating the need for continuous paper consumption and disposal
2Object-affected harmful factors
If interleaving paper is used to prevent scratches on the surface, then the surface is protected during handling, but the removal process increases plate-making load and risks peeling failure
Solution Approach 1:
The protective layer is applied in advance during the manufacturing of the printing plate precursor, providing surface protection before the plates are put into service, eliminating the need for subsequent removal actions that would slow down plate-making
3Object-affected harmful factors
If the protective layer thickness is increased to prevent projection falling and scratches, then surface protection is improved, but the Bekk smoothness may increase which could affect development efficiency
Solution Approach 1:
The invention changes the material composition and surface properties of the protective layer by using inorganic layered compounds or silica-coated organic resin particles with specific characteristics, enabling the layer to provide protection while maintaining Bekk smoothness of 1000 seconds or less
Solution Approach 2:
The protective layer uses composite material structures (inorganic layered compounds or silica-coated organic resin particles) that combine the protective function with smooth surface properties, achieving both protection and acceptable Bekk smoothness
Data Source
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AI summary
Provided are a planographic printing plate precursor including an aluminum support, and an image recording layer and a protective layer in this order, in which a thickness of the protective layer is 0.2 µm or greater, and specific Expression (1) is satisfied in a case where a Bekk smoothness of a surface of an outermost layer at a side where the image recording layer is provided is denoted by A seconds; a planographic printing plate precursor laminate; a plate-making method for a planographic printing plate; and a planographic printing method.