Flexographic Printing Element With Polar Ultra-Thin Oxygen Barrier
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Solution Overview
Problem
Existing flexographic printing elements face challenges in achieving complete polymerization of relief elements due to oxygen interference during exposure, leading to insufficient surface polymerization and compromised fine detail imaging, and the use of oxygen-blocking barrier layers is hindered by compatibility issues with commercially available wash-out agents and mechanical handling.
Innovation Solution
A digitally imageable flexographic printing element with a polar, ultra-thin oxygen-blocking barrier layer between the photopolymerizable and laser-ablatable layers, allowing exposure in a hydrocarbon-based wash-out agent and enabling flexible assembly without damage, while maintaining high detail and fine structure quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is added to block oxygen during exposure, then polymerization completeness is improved, but layer structure complexity increases
Solution Approach 1:
The laser-ablatable mask layer is designed to serve dual functions: as the imaging layer that absorbs laser radiation and as the oxygen barrier layer that protects the photopolymerizable layer during exposure. This eliminates the need for a separate oxygen barrier layer, resolving the contradiction between polymerization completeness and structural complexity
Solution Approach 2:
The patent combines the oxygen barrier function with the laser-ablatable mask layer by positioning it between the mask and photopolymerizable layer. This merging of functions achieves complete polymerization while maintaining a simple three-layer structure (carrier film, photopolymerizable layer, mask layer)
2Object-affected harmful factors
If a thick barrier layer is used to block oxygen, then oxygen diffusion prevention is improved, but mechanical flexibility and handling ease deteriorate
Solution Approach 1:
The patent employs an ultra-thin oxygen barrier layer (1 nm to 10 nm) that maintains flexibility and mechanical integrity while providing effective oxygen diffusion prevention. This thin film approach resolves the contradiction between oxygen blocking and mechanical flexibility
Solution Approach 2:
The barrier layer thickness is optimized to an ultra-thin range (1-10 nm) that provides sufficient oxygen barrier properties while maintaining mechanical flexibility and ease of handling, eliminating the need for thick rigid barrier layers
3Reliability
If a polar barrier layer is used to block oxygen, then oxygen-blocking performance is improved, but compatibility with hydrocarbon-based wash-out agents worsens
Solution Approach 1:
The oxygen barrier layer is designed with polar groups that provide effective oxygen blocking while maintaining chemical compatibility with hydrocarbon-based wash-out agents through controlled polarity, resolving the contradiction between oxygen-blocking performance and wash-out compatibility
Solution Approach 2:
The polarity of the barrier layer is optimized to provide sufficient oxygen barrier properties while remaining compatible with hydrocarbon-based wash-out agents, allowing effective development without requiring non-polar materials that would fail to block oxygen
4Object-affected harmful factors
If conventional thick barrier layers are used, then oxygen diffusion is blocked, but fine detail imaging capability deteriorates
Solution Approach 1:
An ultra-thin oxygen barrier layer (1-10 nm) is used that provides effective oxygen diffusion prevention while maintaining optical transparency and not interfering with laser ablation or fine detail imaging, resolving the contradiction between oxygen blocking and imaging precision
Solution Approach 2:
The oxygen barrier function is achieved in the thickness dimension (ultra-thin 1-10 nm layer) rather than through lateral expansion, allowing fine detail imaging to proceed without obstruction while oxygen diffusion is blocked through the nanoscale barrier
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 ensures complete polymerization of relief elements down to the surface, enabling finer details and improved ink transfer, and allows for efficient wash-out and assembly without mechanical damage, enhancing the quality and usability of flexographic printing plates.
Implementation Method 1
a polar, ultra-thin, oxygen-blocking barrier layer between the photopolymerizable layer and the digitally imageable layer
Implementation Method 2
The photopolymerizable layer polymerizes in the areas no longer covered by the mask, while no polymerization occurs in the covered areas
Implementation Method 3
a mask can be written into the laser-ablatable layer using an IR laser, i.e. the layer is decomposed at the points where it is hit by the laser beam
Data Source
AI summary
The invention relates to flexographic printing elements which can be digitally imaged, for producing flexographic printing plates which can be developed using hydrocarbon-including washout products, and which have a polar, ultra-thin oxygen-blocking barrier layer between the photopolymerizable layer and the layer that can be digitally imprinted. The invention also relates to a method for producing flexographic printing plates using said flexographic printing elements which can be digitally imaged, by imaging, exposure, washout, drying and post-treatment, the washout being done by means of hydrocarbon-including washout products.