Flexographic Printing Plate Dry Development for Thickness Uniformity
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Solution Overview
Problem
Conventional heat development methods for flexographic printing plates face issues with thickness uniformity and image uniformity, particularly for large-size plates, leading to deterioration in print quality.
Innovation Solution
A method combining a photosensitive resin composition with specific storage and loss elastic moduli and a development medium with defined elastic recovery rates to enhance thickness uniformity, using a wiper for dry development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat development scheme is used to remove unexposed portion, then developing process becomes cleaner and faster, but thickness uniformity deteriorates due to poor developability and residues
Solution Approach 1:
The patent applies parameter changes by controlling the storage elastic modulus of the photosensitive resin composition to be within 100 Pa to 4000 Pa at the development temperature. This specific parameter range enables the resin to have appropriate fluidity for complete removal while maintaining thickness uniformity, resolving the contradiction between development speed and precision.
Solution Approach 2:
The patent replaces the mechanical pressing action required in conventional heat development with a controlled elastic deformation mechanism. By selecting resin compositions with specific elastic modulus ranges, the system achieves effective development through material properties rather than mechanical force, eliminating the need for hard pressing and subsequent thickness reduction.
2Area of stationary object
If original flexographic printing plate has larger size, then printing capacity increases, but development medium cannot be pressed uniformly leading to thickness non-uniformity
Solution Approach 1:
The patent resolves the contradiction between large plate size and thickness uniformity by changing the material parameter of the photosensitive resin composition. By controlling the storage elastic modulus to be within 100 Pa to 4000 Pa, the resin maintains appropriate fluidity across large areas, enabling uniform development without requiring high pressing forces that would compromise thickness uniformity.
3Reliability
If pressing action is applied to enhance developability, then removal of unexposed portion improves, but plate thickness decreases
Solution Approach 1:
The patent replaces mechanical pressing with controlled elastic deformation by selecting resin compositions with specific elastic modulus ranges (100 Pa to 4000 Pa). This substitution eliminates the need for hard pressing while achieving complete removal of unexposed portions, thereby maintaining plate thickness and preventing deformation.
Solution Approach 2:
The patent changes the material parameter of the photosensitive resin composition to resolve the contradiction between developability and thickness maintenance. By controlling the storage elastic modulus within the specified range, the resin achieves appropriate fluidity for complete removal without requiring mechanical pressing that would reduce thickness.
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 method produces printing plates with improved thickness uniformity and image quality, addressing the limitations of conventional heat development techniques.
Implementation Method 1
the whole surface of a photosensitive resin composition layer is subjected to ultraviolet exposure (called back exposure) through a support to establish a uniform photocured layer
Implementation Method 2
a heat development scheme, which performs development by heating an original flexographic printing plate after relief exposure to melt an unexposed portion
Implementation Method 3
a developing step of performing development by attaching or adsorbing the photosensitive resin composition of an unexposed portion in the exposure step to a development medium
Data Source
AI summary
A method for producing a printing plate, containing: an exposure step of forming a relief by the exposure of a photosensitive resin composition; and a developing step of performing development by attaching or adsorbing the photosensitive resin composition of an unexposed portion in the exposure step to a development medium, wherein a storage elastic modulus of the photosensitive resin composition of the unexposed portion at a development temperature of the developing step is 100 Pa or more and 4000 Pa or less, and the development medium is a wiper having an elastic recovery rate of 30% or more and 99% or less.