Oxygen Barrier Layer for Flexographic Platemaking
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Solution Overview
Problem
Flexographic printing plates face difficulties in maintaining small graphic elements like fine dots and lines due to the nature of the platemaking process, where small dots are prone to removal or damage, and the curing reaction of photocurable resin compositions is inhibited by molecular oxygen, leading to suboptimal printing quality.
Innovation Solution
A combined laminating and exposure system that automates the production of digital relief image printing elements through simultaneous face and back exposures, with an oxygen barrier layer to limit oxygen diffusion and attenuate actinic radiation, ensuring desirable geometric characteristics and improved printing dot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If photocurable resin composition is used for relief layers, then durability and flexibility are improved, but curing reaction is inhibited by molecular oxygen leading to suboptimal printing quality
Solution Approach 1:
The patent introduces a porous layer that deliberately allows oxygen to reach the relief layer during curing, converting the harmful oxygen inhibition effect into a beneficial process control mechanism. The porous structure enables controlled oxygen permeation that prevents excessive curing in non-image areas while maintaining durability in image areas.
Solution Approach 2:
The patent applies different properties to different regions: the relief layer has high durability through photocurable resin, while the porous layer provides localized oxygen permeability only where needed. This spatial differentiation of properties allows simultaneous achievement of durability and printing quality.
2Manufacturing precision
If small graphic elements like fine dots and lines are printed, then printing detail is improved, but small dots are prone to removal or damage during processing
Solution Approach 1:
The porous layer creates localized oxygen-permeable regions that protect small graphic elements during processing. The oxygen-controlled environment prevents premature or excessive curing in vulnerable areas while maintaining the precision of fine dots and lines.
Solution Approach 2:
The patent prepares the curing environment in advance by introducing the porous layer before the curing process begins. This pre-prepared oxygen-controlled environment cushions and protects small graphic elements from damage during subsequent processing steps.
3Ease of manufacture
If conventional platemaking process is used, then manufacturing simplicity is maintained, but production efficiency and quality consistency are reduced
Solution Approach 1:
The patent combines the porous layer integration and oxygen-controlled curing into a unified process step that occurs during standard platemaking operations. This merging maintains manufacturing simplicity while dramatically improving production efficiency and quality consistency through automated oxygen management.
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
This approach streamlines the platemaking process, enhances the production of printing dots with desirable geometric characteristics, and improves the quality of printed images by reducing dot damage and ensuring uniform curing, thereby addressing the challenges of maintaining small graphic elements and oxygen inhibition in the curing reaction.
Implementation Method 1
an oxygen barrier layer to limit oxygen diffusion
Implementation Method 2
attenuate actinic radiation
Implementation Method 3
The photocurable layer(s) can include any of the known photopolymers, monomers, initiators... undergoes polymerization, cross-linking, or any other curing or hardening reaction in response to actinic radiation
Implementation Method 4
the laser ablatable mask layer is laser ablated to create an in situ negative in the laser ablatable mask layer
Data Source
AI summary
A combined laminating and exposing apparatus for exposing a photosensitive printing blank to actinic radiation in a printing plate manufacturing system and a method of using the same are disclosed. The photosensitive printing blank comprises a backing layer, at least one photocurable layer disposed on the backing layer, and a laser ablatable mask layer disposed on the at least one photocurable layer, wherein the laser ablatable mask layer is laser ablated to create an in situ negative in the laser ablatable mask layer. The exposing apparatus comprises: (a) a laminating apparatus for laminating an oxygen barrier layer to a top of the laser ablated mask layer; (b) a conveyor; (c) a first exposing device for imagewise exposing the at least one photocurable layer to actinic radiation, and (d) a second exposing device for exposing the at least one photocurable layer to actinic radiation through the backing layer.