Flexographic Printing Plate Barrier Layer for Oxygen-Blocked UVA Exposure
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Solution Overview
Problem
Existing flexographic printing technologies face challenges in preventing oxygen interference during exposure, leading to insufficient polymerization of relief elements and rounded corners, and require additional equipment or processes to mitigate this issue, which can introduce defects and increase costs.
Innovation Solution
A method for producing flexographic printing plates with an integrated oxygen-blocking barrier layer that is transparent to UVA light, composed of an oxygen-blocking binder and an oligomeric or polymeric basic adhesive component, allowing for solvent-soluble layers and improved adhesion between layers, ensuring high resolution and consistent print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a barrier layer is applied to prevent oxygen interference during exposure, then polymerization completeness is improved, but device complexity increases
Solution Approach 1:
The patent combines the barrier layer function with the mask layer into a single integrated structure. The mask layer is designed to serve dual purposes: as the imaging mask and as the oxygen barrier during exposure. This eliminates the need for a separate barrier layer, reducing structural complexity while maintaining polymerization completeness.
Solution Approach 2:
The mask layer is given multiple functions: it acts as both the imaging mask (defining the printed pattern) and the oxygen barrier (preventing oxygen interference during exposure). This multi-functionality approach resolves the contradiction by eliminating the need for additional specialized components.
2Manufacturing precision
If high-power UVA light is used to overcome oxygen influence, then polymerization completeness is improved, but energy consumption increases
Solution Approach 1:
The patent converts the harmful effect of oxygen (which interferes with polymerization) into a manageable parameter by using a barrier layer that selectively blocks oxygen while allowing UVA light to pass through. This enables the use of standard-power UVA light sources, avoiding the need for high-power equipment and reducing energy consumption.
3Manufacturing precision
If additional equipment is used to expose under protective gas or vacuum, then polymerization completeness is improved, but device complexity increases
Solution Approach 1:
The patent extracts the oxygen barrier function from the exposure environment (protective gas or vacuum) and incorporates it directly into the mask layer structure. This allows exposure to proceed in normal atmospheric conditions without requiring complex gas handling or vacuum equipment, while still achieving complete polymerization.
4Object-affected harmful factors
If lamination of barrier layer is performed after imaging, then oxygen protection is improved, but manufacturing precision deteriorates due to potential defects
Solution Approach 1:
The patent incorporates the oxygen barrier function into the mask layer before imaging occurs. The barrier properties are built into the original mask structure, eliminating the need for post-imaging lamination. This prevents potential defects from lamination processes while maintaining effective oxygen protection throughout the exposure and development steps.
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 integrated barrier layer effectively prevents oxygen diffusion, enabling precise reproduction of fine details and improved ink transfer, while maintaining compatibility with standard processing equipment and solvents, ensuring high-resolution and reliable printing performance.
Implementation Method 1
an organically soluble barrier layer for oxygen
Implementation Method 2
The photopolymerizable layer polymerizes in the areas no longer covered by the mask
Implementation Method 3
the layer is degraded at the points where it is struck by the laser beam
Data Source
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AI summary
The invention relates to a method for producing a flexographic printing form from a digitally imageable, photopolymerizable flexographic printing element comprising, arranged one above the other in the aforementioned order, at least one dimensionally stable carrier (A), at least one photopolymerizable, relief-forming layer (B), a UVA-light transparent, oxygen-blocking barrier layer (C), a laser-ablatable mask layer (D), and a peelable cover film (E), wherein the method comprises at least the steps (i) peeling off the cover film (E), (ii) inscribing a mask into the laser-ablatable mask layer (D) using an IR laser, (iii) exposing the imaged flexographic printing element with UVA light through the formed mask, (iv) removing the residues of the laser-ablatable mask layer (D), the barrier layer (C), and the unpolymerized portions of the relief-forming layer (B).and (v) optionally includes post-exposure of the dried flexographic printing plate with UVA and/or UVC light, wherein layers (B), (C) and (D) are soluble or dispersible in an organic solvent, and the barrier layer (C) contains at least an oxygen-blocking binder and an oligomeric or polymeric basic adhesive component, and that the at least partial removal according to step (iv) is carried out by heating and removing the unexposed areas using a developing material.