Flexographic Printing Plate Protective Layer Modulus Control
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Solution Overview
Problem
Flexographic printing plates developed using water-based photosensitive resin layers, particularly those with latex as a main component, suffer from poor reproducibility of fine lines due to deformation of the protective layer when attached and detached from a drum, leading to wrinkles and inadequate resolution.
Innovation Solution
A flexographic printing original plate with a photosensitive resin layer and a protective layer that has a Young's modulus of 4 MPa to 35 MPa and a layer thickness of 0.2 μm to 2.0 μm, ensuring that the protective layer does not deform the photosensitive resin layer, thereby improving reproducibility and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a water-based photosensitive resin layer with latex as main component is used, then the plate becomes flexible and can be developed by water, but wrinkles are formed and reproducibility of fine lines is poor
Solution Approach 1:
The patent applies parameter changes by precisely controlling the elastic modulus of the protective layer within 0.3-5 MPa and its thickness within 0.1-5 μm. These parameter adjustments optimize the protective layer's mechanical properties to prevent deformation of the photosensitive resin layer during drum attachment and detachment, thereby eliminating wrinkles while maintaining water developability
Solution Approach 2:
The patent employs composite materials by combining the water-based photosensitive resin layer containing latex particles with a specifically designed protective layer. This composite structure leverages the flexibility and water developability of the latex-based resin while the protective layer provides mechanical stability, preventing wrinkles and fine line degradation through its optimized elastic modulus and thickness
2Shape
If the protective layer is made thinner or more flexible to reduce wrinkles, then the plate flexibility improves, but the protective layer deforms and sinks into the photosensitive resin layer
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing optimal ranges for the protective layer's elastic modulus (0.3-5 MPa) and thickness (0.1-5 μm). This precise parameter control ensures the protective layer maintains sufficient mechanical strength to support fine line patterns during processing while remaining thin and flexible enough to prevent wrinkle formation on the plate surface
3Reliability
If a conventional protective layer is used on water-based latex plates, then oxygen inhibition is prevented, but the plate develops wrinkles and poor fine line reproduction
Solution Approach 1:
The patent applies parameter changes by optimizing the protective layer's elastic modulus (0.3-5 MPa) and thickness (0.1-5 μm) to achieve a balance between functional performance and dimensional stability. This ensures the protective layer is sufficiently thin and compliant to conform to fine line patterns without deformation, while still providing adequate barrier function against oxygen inhibition
Solution Approach 2:
The patent uses composite materials by creating a multi-layer structure where the protective layer is specifically engineered with optimized mechanical properties to be compatible with the water-based latex photosensitive resin layer. This composite design ensures both layers work together harmoniously, preventing both oxygen inhibition and fine line degradation
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 results in a flexible aqueous developing plate with excellent reproducibility of fine lines, resolution, and printing properties, while preventing wrinkles and polymerization inhibition by oxygen.
Implementation Method 1
a protective layer for preventing the polymerization inhibition due to oxygen in the photosensitive resin layer
Implementation Method 2
a photosensitive resin layer which is able to be developed by water
Data Source
AI summary
The present invention aims to provide a flexographic printing original plate where, although it is a flexible aqueous developing plate, reproducibility of fine lines is good. A flexographic printing original plate which is a photosensitive printing original plate where at least (A) a supporting member, (B) a photosensitive resin layer, (C) a protective layer for preventing the polymerization inhibition due to oxygen in the photosensitive resin layer and (D) a heat-sensitive mask layer are successively layered, characterized in that, the photosensitive resin layer (B) is a layer which is able to be developed by water, Young's modulus of the protective layer (C) is 4 MPa to 35 MPa, layer thickness of the protective layer (C) is 0.2 μm to 2.0 μm and Young's modulus (MPa) and layer thickness (μm) of the protective layer (C) satisfy the following formula 1:1≦(Young's modulus)×(Layer thickness)2≦18 (Formula 1).