Flexographic Printing Plate Template Layer Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing high-resolution flexographic printing plates using digital information transmission face challenges in achieving high resolution for low and high tonal values, require expensive excimer lasers, and are prone to oxygen attack during exposure, necessitating costly exposure units and unstable arylazophosphonate-containing compounds.
Innovation Solution
A recording element comprising a carrier film, a photopolymerizable relief layer, an intermediate layer transparent to actinic radiation, and a recordable template layer based on monomeric diazonium compounds sensitive to actinic laser radiation, which can be imaged and developed to improve resolution and reduce oxygen exposure without needing short-wave lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photopolymerizable layers are used for flexographic printing plates, then the basic printing function is achieved, but the resolution of fine print elements and low/high tonal values is insufficient
Solution Approach 1:
The patent uses a composite recordable layer consisting of a photopolymerizable layer containing arylazophosphonate compounds combined with a diazonium compound. This composite structure leverages the high resolution capability of arylazophosphonate while adding the stability and laser sensitivity of diazonium compounds, achieving both fine detail reproduction and process reliability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the recordable layer by incorporating specific ratios of arylazophosphonate compounds (with different n values from 1 to 10) and diazonium compounds. This parameter optimization enables the layer to achieve high resolution while maintaining stability against oxygen attack and ensuring reliable imaging.
2Manufacturing precision
If arylazophosphonate-containing compounds are used as recordable layers, then high resolution is achieved, but the compounds are unstable and age quickly
Solution Approach 1:
The patent combines arylazophosphonate compounds with diazonium compounds in a composite recordable layer. The diazonium component acts as a stabilizing agent that reduces the aging tendency of arylazophosphonate compounds while maintaining the high resolution capability, effectively resolving the stability issue.
Solution Approach 2:
The diazonium compound serves as an intermediary that mediates between the high resolution capability of arylazophosphonate and the stability requirements. It provides laser sensitivity and stabilizes the composite layer against oxidation and aging during storage and handling.
3Manufacturing precision
If excimer lasers are used for imaging, then high resolution is achieved, but the equipment becomes expensive
Solution Approach 1:
The patent changes the optical parameters of the recordable layer by incorporating diazonium compounds that are sensitive to standard laser wavelengths (e.g., 405 nm, 532 nm). This allows the use of conventional, less expensive laser sources instead of expensive excimer lasers, while maintaining high resolution through the optimized chemical composition.
4Ease of manufacture
If oxygen is present during exposure, then the process is simple, but oxygen attack occurs and intensifies with double exposure
Solution Approach 1:
The patent converts the harmful effect of oxygen attack into a beneficial selective crosslinking process. The arylazophosphonate compounds are specifically designed to crosslink in the presence of oxygen during laser exposure, creating a protective crosslinked structure that prevents further oxygen attack and ensures stable image formation without requiring inert atmospheres.
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 enhances the resolution of screen dots across low and high tonal values, shortens imaging and crosslinking processes, and reduces oxygen attack, enabling the production of high-resolution flexographic printing plates without the need for expensive excimer lasers or additional nitrogen atmospheres.
Implementation Method 1
a photopolymerizable layer/relief layer soluble in organic and/or aqueous solvents which is crosslinkable by actinic radiation
Implementation Method 2
a recordable template layer comprising a monomeric diazonium compound which is photosensitive to actinic laser radiation and undergoes a change in actinic density upon development
Data Source
AI summary
This document describes a recording element suitable for producing high-resolution flexographic printing plates by digital information transfer and imageable using actinic laser radiation. The recording element contains or consists of the following layers: (A) a carrier film, (B) a photopolymerizable layer/relief layer that can be crosslinked by actinic radiation, (C) optionally an intermediate layer or film transparent to actinic radiation as a separating element, (D) a recording-capable template layer comprising a monomeric diazonium compound, or (Da) an imaged template layer. A semi-finished product and a process for producing the recording element, as well as a process for producing flexographic printing plates, are also described.