Aqueous Flexographic Developer Composition for Photopolymer Debris Removal
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Solution Overview
Problem
Aqueous flexographic developers struggle to effectively remove non-exposed photopolymer debris without damaging crosslinked areas, leading to image deterioration and environmental concerns due to the use of solvent-based systems, and pH changes cause solubility issues and debris re-deposition.
Innovation Solution
An aqueous flexographic developer composition comprising a fatty acid composition with at least 85% C18 mono- or poly-unsaturated fatty acids or their alkali metal salts, aminopolycarboxylic acids like EDTA, and a buffer compound, which stabilizes pH and reduces debris formation and re-deposition, while using water as the primary solvent to minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic solvent-based developers are used, then effective removal of non-exposed photopolymer is achieved, but environmental concerns and safety issues arise
Solution Approach 1:
The invention changes the fundamental parameter of the developer composition from organic solvent-based to aqueous-based, while adjusting the pH and adding specific additives (surfactants, chelating agents) to maintain effective development performance without the environmental and safety hazards of organic solvents
Solution Approach 2:
The invention creates a composite aqueous developer system combining water with multiple functional components including surfactants, chelating agents, and pH controllers to achieve the complex requirements of effective photopolymer removal while avoiding organic solvent hazards
2Object-affected harmful factors
If aqueous developers are used to avoid environmental concerns, then environmental safety is improved, but effective removal of non-exposed photopolymer and maintenance of high resolution are compromised
Solution Approach 1:
The invention introduces surfactants as intermediary substances that facilitate the interaction between the aqueous developer and the photopolymer, enabling effective removal while maintaining resolution by mediating the solubility and wetting properties of the system
Solution Approach 2:
The invention carefully controls and adjusts pH parameters and additive concentrations in the aqueous developer to optimize the balance between effective photopolymer removal and prevention of debris re-deposition, thereby maintaining high resolution
3Productivity
If aqueous developers are used continuously, then productivity is improved, but pH changes cause photopolymer components to re-deposit on relief images
Solution Approach 1:
The invention incorporates pH buffering systems and chelating agents that provide feedback control to maintain stable chemical conditions during continuous use, preventing the pH drift that would otherwise cause photopolymer components to re-deposit on the relief images
Solution Approach 2:
The invention adds excess buffering capacity and chelating agents to the developer formulation to compensate for pH changes that occur during continuous processing, ensuring that the pH remains within the optimal range throughout extended use
4Duration of action of moving object
If developer pH becomes more acidic during continuous use, then processing continues, but debris re-deposition on relief images increases
Solution Approach 1:
The invention incorporates buffering agents and chelating agents in advance to cushion against pH changes before they can cause debris re-deposition, maintaining image quality throughout continuous processing by pre-establishing chemical stability
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 significantly reduces debris on flexographic printing members, maintains image resolution, and is more environmentally friendly by using water-based systems, improving the quality and sustainability of the printing process.
Implementation Method 1
a buffering compound... stabilizes pH
Implementation Method 2
an aminopolycarboxylic acid or salt thereof... reduces debris formation and re-deposition
Data Source
AI summary
Flexographic printing members are prepared by developing an exposed flexographic printing member precursor with an aqueous flexographic developer. The aqueous flexographic developer comprises: a) a fatty acid composition consisting of one or more saturated or unsaturated fatty acids or alkali metal salts thereof, each saturated or unsaturated fatty acid or alkali metal salt thereof independently having 12 to 20 carbon atoms, the fatty acid composition being present in an amount of 0.25-2.0 weight %, and at least 85 weight % of the fatty acid composition is composed of one or more C18 mono- or poly-unsaturated fatty acids or alkali metal salts thereof; b) an aminopolycarboxylic acid or alkali metal salt thereof in an amount of 0.05-0.30 weight %; c) a buffer compound in an amount of 05-0.60 weight %; and d) water. Such aqueous flexographic developers can also be provided in concentrated form and appropriately diluted before or during use.