Imageable Material for Flexographic Printing Plates
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Solution Overview
Problem
Existing imageable materials for forming relief images in flexographic printing plates face a trade-off between maintaining highlight dot retention and achieving adequate reverse line depths, with increased exposure leading to improved highlight retention but compromised reverse line depths.
Innovation Solution
An imageable material comprising a transparent polymeric carrier sheet, a barrier layer with infrared and ultraviolet radiation absorbing compounds, and a non-silver halide thermally sensitive imageable layer, which allows for the formation of a relief image with excellent reverse line depths without compromising highlight dot retention, using a simpler design with only three essential layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If increased exposure of the relief-forming material through the imageable material is used, then highlight retention is increased, but reverse line depths are decreased
Solution Approach 1:
The imageable material is divided into three distinct functional layers: a carrier sheet providing structural support, a barrier layer controlling radiation transmission, and an imageable layer forming the mask pattern. This segmentation allows each layer to be independently optimized, enabling the barrier layer to precisely control UV radiation transmission for improved reverse line depths while the imageable layer maintains highlight retention through thermal imaging.
Solution Approach 2:
The barrier layer incorporates UV absorbing compounds at controlled concentrations to modify the transmission characteristics of UV radiation. By adjusting the type and amount of UV absorbers, the exposure parameters can be optimized to achieve both adequate reverse line depths and maintain highlight retention, resolving the trade-off between these two critical parameters.
2Device complexity
If a simpler design with fewer layers is used, then manufacturing complexity is reduced, but image quality and exposure latitude may be compromised
Solution Approach 1:
Each of the three layers performs multiple functions: the carrier sheet provides mechanical support and handles; the barrier layer controls UV radiation transmission and protects the imageable layer; the imageable layer forms the thermal mask pattern. This multi-functionality within a simplified three-layer structure achieves excellent image quality and exposure latitude without requiring the five or more layers found in conventional materials.
3Ease of manufacture
If a simpler three-layer design is used, then manufacturing cost is reduced, but performance in achieving both highlight retention and reverse line depths may be compromised
Solution Approach 1:
The imageable material uses composite construction with the barrier layer containing UV absorbing compounds dispersed in a polymer matrix, and the imageable layer containing infrared absorbing compounds and thermal imaging agents. This composite approach enables precise control of radiation interactions at lower cost than conventional multi-layer materials, achieving excellent exposure latitude and image quality.
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 provides a relief image with improved reverse line depths and maintained highlight dot retention, achieving better exposure latitude and image quality compared to more complex materials, while also simplifying the construction and reducing manufacturing costs.
Implementation Method 1
the barrier layer comprising a first infrared radiation absorbing compound
Implementation Method 2
either or both of the transparent polymeric carrier sheet and barrier layer further comprise a first ultraviolet radiation absorbing compound
Implementation Method 3
the non-silver halide thermally sensitive imageable layer comprising a second infrared radiation absorbing compound
Implementation Method 4
exposing a relief-forming material with curing radiation through the imaged mask material to form an imaged relief-forming material
Data Source
AI summary
An imageable material can be used to form a mask image for providing a relief image. This imageable material has a simplified structure and consists essentially of, in order: a transparent polymeric carrier sheet and a barrier layer comprising a first infrared radiation absorbing compound. A first ultraviolet radiation absorbing compound is provided in the transparent polymeric carrier sheet or the barrier layer. A non-silver halide thermally sensitive imageable layer is disposed on the barrier layer and comprises a second infrared radiation absorbing compound and a second ultraviolet radiation absorbing compound. A relief image is formed by imaging the imageable material to form an imaged mask material, exposing a relief-forming material with curing radiation through the imaged mask material to form exposed regions and non-exposed regions, and developing the imaged relief-forming material to form a relief image by removing its non-exposed regions.