Flexographic Printing Plate Intermediate Layer Oxygen Blocking
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Solution Overview
Problem
Conventional flexographic printing plates using polyvinyl alcohol resin barrier layers suffer from poor bending resistance, cracking, and wrinking, leading to pin holes in the infrared ablation layer, which inhibit the formation of deep relief images with micro-sized dots due to oxygen blocking failure.
Innovation Solution
A flexographic printing raw plate with an intermediate layer containing a hydrophilic resin and a layered inorganic compound, such as water-swellable synthetic mica, between the photosensitive resin composition layer and the infrared ablation layer, enhancing oxygen blocking, pin hole resistance, and cleanability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyvinyl alcohol resin barrier layer is used to block oxygen, then oxygen blocking is improved, but the layer cracks and wrinkles due to poor bending resistance, leading to pin holes
Solution Approach 1:
The patent changes the material composition of the barrier layer from polyvinyl alcohol resin to a composite containing polyvinylidene fluoride and inorganic filler. This parameter change maintains oxygen blocking capability while improving bending resistance and eliminating cracking and wrinkling issues
Solution Approach 2:
The patent creates a composite barrier layer by combining polyvinylidene fluoride with inorganic filler particles. This composite structure provides both the oxygen blocking properties needed for micro dot formation and the mechanical strength to prevent cracking during handling and processing
2Productivity
If the infrared ablation layer is made thin to allow laser penetration, then lithography speed is improved, but pin holes occur due to physical damage and oxygen infiltration
Solution Approach 1:
The patent introduces a protective layer as an intermediary between the infrared ablation layer and the environment. This protective layer shields the thin infrared ablation layer from physical damage and oxygen infiltration, allowing it to maintain thin thickness for fast lithography while preventing pin hole formation
Solution Approach 2:
The protective layer uses a composite structure with polyvinylidene fluoride and inorganic filler, providing both mechanical protection and oxygen barrier properties that prevent pin holes in the underlying thin infrared ablation layer
3Measurement precision
If micro-sized dots are formed for highlight areas, then image definition is improved, but oxygen radicals inhibit photocuring reaction, resulting in insufficient curing
Solution Approach 1:
The patent creates an oxygen-free environment by using the polyvinylidene fluoride-based barrier layer to exclude oxygen from the vicinity of micro-sized dots during photocuring. This inert environment prevents oxygen radicals from inhibiting the photocuring reaction, ensuring complete curing even at very small dot dimensions
Solution Approach 2:
The patent employs a sacrificial protective layer that can be removed after serving its purpose of protecting during storage and processing. This disposable layer provides temporary oxygen exclusion and physical protection, enabling micro dot formation without compromising photocuring completeness
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 enables the formation of deep relief images with high definition and micro-sized dots, improving the printing characteristics of flexographic printing plates by preventing oxygen inhibition and physical damage to the infrared ablation layer.
Implementation Method 1
a layered inorganic compound (B), wherein the intermediate layer has a film thickness of 2 μm or more and 30 μm or less
Implementation Method 2
lithography is performed by irradiating, with a laser, an infrared ablation layer on the photosensitive resin composition layer to remove a part of the infrared ablation layer
Implementation Method 3
a uniform cured layer is formed by performing back exposure in which the entire surface of a photosensitive resin composition layer is irradiated with ultraviolet light through a substrate of a film of PET resin or the like
Data Source
AI summary
A flexographic printing raw plate comprising at least a support, a photosensitive resin composition layer, an intermediate layer, and an infrared ablation layer sequentially stacked, whereinthe intermediate layer comprises a hydrophilic resin (A) and a layered inorganic compound (B), andthe intermediate layer has a film thickness of 2 μm or more and 30 μm or less.