Aqueous Flexographic Developer Formulation for Image Resolution
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Solution Overview
Problem
Aqueous flexographic developers fail to effectively remove non-exposed photopolymer components from flexographic printing precursors, leading to image defects and debris on printing plates due to pH changes and reduced solubility of fatty acids, which results in poor image resolution and contamination.
Innovation Solution
An aqueous flexographic developer composition comprising C18 mono- or poly-unsaturated fatty acids or their alkali metal salts, aminopolycarboxylic acids, and a buffering compound, maintaining a pH of 9 to 12, which stabilizes the solution and enhances solubility, reducing debris and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous flexographic developers are used to process flexographic printing precursors, then environmental safety is improved and solvent toxicity is reduced, but the developers fail to effectively remove non-exposed photopolymer components leading to image defects and debris
Solution Approach 1:
The patent modifies the chemical parameters of the aqueous developer by incorporating specific surfactants and pH controlling agents to enhance the solubility and removal efficiency of non-exposed photopolymer components, thereby improving image resolution while maintaining the environmental benefits of aqueous-based processing
Solution Approach 2:
The invention creates a composite aqueous developer formulation combining multiple components including surfactants, pH controlling agents, and other additives to achieve effective debris removal and high-quality image production without using toxic organic solvents
2Duration of action of moving object
If the pH of aqueous flexographic developer changes during continuous use, then processing capability is reduced, but photopolymer components come out of solution and re-deposit on relief image surfaces causing image defects
Solution Approach 1:
The patent incorporates pH controlling agents that act as a feedback mechanism to automatically maintain the developer's pH within the optimal range of 8.0-10.0 during continuous use, preventing the chemical changes that lead to photopolymer re-deposition and image defects
Solution Approach 2:
The invention adds buffering capacity to the aqueous developer formulation in advance to prevent pH shifts before they can cause problems, ensuring stable processing conditions throughout the developer's service life and preventing premature failure
3Quantity of substance
If fatty acid solubility is reduced in aqueous developer, then debris removal capability deteriorates, but photopolymer debris accumulates on brushes and causes scum on relief images
Solution Approach 1:
The patent introduces surfactants as intermediary substances that facilitate the interaction between the aqueous developer and hydrophobic photopolymer debris, enabling effective removal of non-exposed components by reducing surface tension and enhancing wetting and solubilization
4Productivity
If high concentration of photopolymer components are present in aqueous developer, then effective removal of non-exposed material is achieved, but components stick to processing brushes and cause scum formation
Solution Approach 1:
The patent incorporates additives that prevent photopolymer stickiness and facilitate easy release from processing equipment surfaces, allowing for continuous operation without frequent brush replacement or cleaning, thereby maintaining high productivity without contamination
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 printing plates, maintains image resolution, and provides environmentally friendly and less toxic processing, ensuring high-quality flexographic prints.
Implementation Method 1
a buffering compound... which stabilizes the solution
Implementation Method 2
an aminopolycarboxylic acid or salt thereof... enhances solubility
Implementation Method 3
one or more saturated or unsaturated fatty acids or alkali metal salts thereof, at least one unsaturated having C 18 fatty acid... being predominant in concentration
Data Source
Figure 1
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.