Water-Based Developer Composition for Printing Plate Scum Control
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Solution Overview
Problem
Conventional water-based developers for CTP and negative systems face issues with poor dispersibility of image mask layers containing carbon black, leading to scum deposition on brushes and printing plates, which deteriorates surface quality and requires frequent developer changes, increasing environmental and manufacturing costs.
Innovation Solution
A developer composition comprising alkali metal salts of saturated and unsaturated fatty acids in specific ratios, along with optional alkali agents, is used to enhance the dispersibility of image mask layers, preventing scum deposition and maintaining surface quality even during repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-based developers are used for CTP and negative systems, then the development process can be carried out, but poor dispersibility of image mask layers containing carbon black occurs, leading to scum deposition on brushes and printing plates
Solution Approach 1:
The patent changes the chemical composition parameters of the developer by incorporating specific surfactants (anionic, nonionic, and/or cationic types) and alkali agents to optimize the dispersibility of carbon black-containing image mask layers. This chemical parameter modification prevents scum deposition while maintaining effective development
Solution Approach 2:
The patent introduces surfactants as intermediary substances that mediate between the hydrophobic carbon black particles and the aqueous developer solution. These surfactants act as intermediaries that improve wetting and dispersion, preventing scum formation on brushes and printing plates
2Productivity
If the same water-based developer is used repeatedly, then manufacturing cost is reduced, but the non-crosslinked composition (scum) dispersed in the developer sticks to brushes and printing plate surface, deteriorating quality
Solution Approach 1:
The patent modifies the developer composition with specific surfactants and alkali agents that maintain stable dispersibility over repeated use. These compositional changes ensure that scum does not re-deposit on brushes or printing plates even after multiple development cycles, allowing extended developer reuse without quality deterioration
3Manufacturing precision
If frequent developer changes are made to prevent scum deposition, then plate surface quality is maintained, but environmental burden and manufacturing cost increase
Solution Approach 1:
The patent optimizes the chemical composition of the developer with specific surfactants and alkali agents that enable long-term stable performance. This compositional optimization allows the same developer to be reused extensively while maintaining plate surface quality, thereby reducing waste and associated environmental and cost burdens
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 developer composition effectively prevents scum from sticking to brushes and printing plates, reducing the need for frequent developer changes and minimizing environmental and cost burdens, while maintaining high surface quality throughout the printing process.
Implementation Method 1
the non-image area protected from light by an image mask during the active ray irradiation is removed by washing with a water-based developer. At that time, the image mask layer and the non-crosslinked resin composition are dissolved or dispersed in the developer
Implementation Method 2
As to the surfactant, it has been said that sodium alkylnaphthalene sulfonate, sodium alkylbenzene sulfonate, etc. may be used
Implementation Method 3
it has been said to be suitable to use water of pH 5.0 to 9.0 including the common household water or that in which an alkaline compound such as sodium hydroxide or sodium carbonate, a surfactant or a water-soluble organic solvent is made to contain
Data Source
AI summary
The present invention provides a water-based developer where the dispersibility of an image mask layer in a developer is good in a developing step of a water-developable printing original plate of a CTP system. Also, the present invention also provides a water-based developer where the scum dispersibility in the developer is good even the developing is repeatedly conducted in large quantities using the same developer in a developing step of a water-developable printing original plate of a negative system. According to the present invention, there is provided a developer composition for a printing plate containing (a) alkali metal salt of saturated fatty acid having carbon number of 12 to 18 and (b) alkali metal salt of unsaturated fatty acid having carbon number of 12 to 18 in a weight ratio of from 20:80 to 80:20 in terms of (a) : (b) . The developer composition may further contain an alkali agent (c) . In this case, a weight ratio of (a) : (b) may be from 20:80 to 80:20, and the alkali agent (c) may be contained in amount of 0. O1 to 10 part (s) by weight to 100 parts by weight in total of the components (a) and (b).