Resin Printing Plate Precursor Laser Engravability Toughness
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Solution Overview
Problem
Resin printing plate precursors for laser engraving face challenges in achieving durability and preventing relief cracks under printing tension, as well as managing residues post-engraving, with existing solutions not fully addressing these issues.
Innovation Solution
A resin printing plate precursor is developed with a modified partially saponified polyvinyl acetate containing reactive groups in its side chain, combined with a polyamide having basic nitrogen, and additional components to enhance flexibility and residue removability, including a photopolymerization initiator and polyhydric alcohols, to create a robust and easily removable relief structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a partially saponified polyvinyl acetate is used as a polymer for laser engraving, then the resin printing plate precursor can be engraved by laser to form projections and depressions, but the relief becomes fragile and cracks occur during printing under repeated impacts
Solution Approach 1:
The patent uses a composite polymer system combining partially saponified polyvinyl acetate with polyvinyl alcohol and polyacrylic acid. This composite structure provides both laser engravability from the polyvinyl acetate component and crack resistance from the polyvinyl alcohol and polyacrylic acid components that form a more resilient matrix
Solution Approach 2:
The patent modifies the degree of saponification of the polyvinyl acetate and controls the molecular weight and composition ratios of the polymer blend to optimize both laser engraving response and mechanical durability. By adjusting these parameters, the material achieves a balance between being laser-responsive and mechanically robust
2Strength
If polyvinyl acetate derivative and polyamide with basic nitrogen are added to improve crack resistance, then some toughness is achieved, but the relief still cracks under pulling tension when wrapped around a cylinder drum
Solution Approach 1:
The patent creates a three-component polymer composite combining partially saponified polyvinyl acetate, polyvinyl alcohol, and polyacrylic acid. This composite provides synergistic effects where each component contributes to overall toughness and elasticity, enabling the relief to withstand wrapping tension without cracking
Solution Approach 2:
The patent creates local regions with different polymer compositions and crosslinking densities to provide varying mechanical properties. The polymer network is designed to have flexible regions that can accommodate stress during wrapping while maintaining structural integrity in critical areas
3Manufacturing precision
If reactive groups are introduced into the side chain of partially saponified polyvinyl acetate, then photosensitivity is improved, but the material becomes more brittle and prone to cracking
Solution Approach 1:
The patent combines photosensitive components with toughening agents in a composite polymer system. The photosensitive resin provides manufacturing precision while the polyvinyl alcohol and polyacrylic acid components provide mechanical toughness, preventing the brittleness that would result from photosensitive groups alone
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 significantly reduces relief crack occurrence during printing and facilitates easy removal of residues, providing improved printing durability and reproducibility while maintaining flexibility and resistance to impacts.
Implementation Method 1
a photopolymerization initiator (D)
Implementation Method 2
laser engraving, which forms projections and depressions, i.e., a relief, by literally engraving with a laser
Data Source
AI summary
It is an object of the present invention to provide a resin printing plate precursor for laser engraving that is able to form a relief by laser engraving, the relief having excellent image reproducibility, and moreover has toughness and improved printing durability. The present invention is a resin printing plate precursor for laser engraving comprising a substrate and a resin layer on the substrate, the resin layer containing: (A) a modified partially saponified polyvinyl acetate having reactive groups in its side chain; (B) a polyamide having basic nitrogen; (C) a compound having a 5- to 7-membered ring and a polymerizable ethylenic double bond; and (D) a photopolymerization initiator.