Conformable Support for Thermal Development of Flexographic Printing Elements
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Solution Overview
Problem
Thermal processing of flexographic printing elements often fails to adequately clean out uncured photopolymer material from recessed areas, leading to non-uniform relief depth and poor print performance, especially with thick photopolymerizable layers, due to inadequate contact and increased heat which can cause distortion.
Innovation Solution
A method and apparatus that uses a conformable material with a compression modulus between 3 and 1500 psi disposed between the photosensitive element and the base member to enhance conformity and contact with the development medium, allowing for efficient removal of uncured material at lower temperatures, reducing the need for high pressure and heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high heat and high pressure are applied during thermal development, then removal of uncured material is improved, but distortion of the photosensitive element increases
Solution Approach 1:
A conformable support member is introduced as an intermediary between the photosensitive element and the base member. This support member conforms to the element's contours and applies distributed contact pressure, enabling effective removal of uncured material from recessed areas without concentrating heat or pressure that would cause distortion. The conformable support acts as a mediator that transmits force uniformly across the element surface.
Solution Approach 2:
The invention changes the pressure distribution parameter by using a conformable support member with specific mechanical properties (compression modulus between 3 and 1500 psi). This parameter change allows the system to achieve adequate contact pressure for material removal while preventing localized stress concentrations that would cause distortion. The support member's compliance enables adaptive pressure distribution.
2Stability of the object's composition
If the photosensitive element is supported on a rigid base member, then structural stability is improved, but contact with development medium is insufficient
Solution Approach 1:
The base member is designed with a conformable support member that has flexible characteristics (compression modulus between 3 and 1500 psi). This flexible support member can deform to conform to the photosensitive element's contours, ensuring uniform contact with the development medium while maintaining structural stability during the thermal development process.
3Adaptability or versatility
If thick photopolymerizable layers are used, then printing capability is improved, but removal of uncured material becomes inadequate
Solution Approach 1:
The conformable support member serves as a mediator that applies distributed contact pressure across the thick photopolymerizable layer. This pressure distribution enables the development medium to effectively remove uncured material from recessed areas and throughout the layer thickness, while the support member's compliance prevents distortion even in thick layer configurations.
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 improves the removal of uncured material from recessed areas, achieving uniform relief depth and reducing the risk of distortion, resulting in better print performance and energy efficiency.
Implementation Method 1
a conformable material having a compression modulus between 3 and 1500 psi disposed between the base member and the side of the photosensitive element
Implementation Method 2
heating the exterior surface to a temperature sufficient to cause a portion of the layer to liquefy
Implementation Method 3
cause the composition in the unexposed portions of the photosensitive layer to soften or melt
Implementation Method 4
The absorbent material collects the softened un-irradiated material
Data Source
AI summary
The present invention provides a method and apparatus for forming a printing form from a photosensitive element to form a relief pattern. The method and apparatus thermally develop the photosensitive element by heating a composition layer of the element to cause a portion of the layer to liquefy and providing a development medium to the element to remove the liquefied composition. A conformable layer is disposed between the photosensitive element and a base support, which improves the compressibility and the contact between the photosensitive element and the development medium. The method and apparatus improve the efficiency of the removal of liquefied portions from the photosensitive element and the uniformity of the relief pattern formed.