Pretreatment Solution for Inkjet Printing
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Solution Overview
Problem
Conventional pretreatment solutions for inkjet printing face challenges in achieving high-quality image formation at high speed and high resolution on various recording media, particularly due to issues with coating uniformity, drying properties, and storage stability, leading to problems like bleeding, color irregularities, and adhesion to printing apparatus.
Innovation Solution
A pretreatment solution comprising an inorganic or organic metal salt, an organic solvent with hydroxyl groups, and a surfactant, applied in specific concentrations to form an ink aggregation layer, which improves wetting, drying, and storage stability, ensuring uniform coating and high-quality image formation across different media types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pretreatment solutions are used to improve image quality on non-absorptive media, then bleeding between colors is reduced, but coating uniformity deteriorates and adhesion to the printing apparatus occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of polyvalent metal ions (2-8% by weight) and organic solvent (50-100% by weight relative to total organic solvent), and by selecting organic solvents with specific surface tension (20-32 mN/m). These parameter optimizations resolve the contradiction by achieving both good image quality and coating uniformity simultaneously.
2Manufacturing precision
If conventional pretreatment solutions are used to improve image quality on non-absorptive media, then bleeding between colors is reduced, but drying properties worsen and storage stability deteriorates
Solution Approach 1:
The patent optimizes parameters by limiting high-boiling point organic solvents to 15% or less by weight and controlling the overall composition ratios. This resolves the contradiction by achieving both good image quality and storage stability through balanced formulation.
3Productivity
If high-speed inkjet printing is performed to improve productivity, then output increases, but image quality deteriorates due to bleeding and color irregularities
Solution Approach 1:
The patent applies preliminary action by pre-treating the recording medium with an optimized pretreatment solution before inkjet printing. This creates an ink aggregation layer that prevents bleeding and color irregularities, enabling high-speed printing while maintaining image quality.
4Object-affected harmful factors
If aqueous inkjet ink is used to replace solvent inks for environmental reasons, then harmful organic solvents are reduced, but image quality on non-absorptive media deteriorates due to bleeding
Solution Approach 1:
The patent introduces a pretreatment solution containing polyvalent metal ions as an intermediary between the aqueous inkjet ink and non-absorptive recording media. This intermediary layer promotes ink aggregation and prevents bleeding, enabling high image quality with environmentally friendly aqueous inks.
5Manufacturing precision
If ink aggregation layer is formed to improve image quality, then bleeding is reduced, but drying properties worsen and adhesion to apparatus occurs
Solution Approach 1:
The patent resolves this contradiction by optimizing the composition parameters: controlling polyvalent metal ion concentration at 2-8% by weight, selecting organic solvents with surface tension of 20-32 mN/m, and limiting high-boiling point solvents to 15% or less. These changes enable effective ink aggregation while maintaining good drying properties and preventing adhesion.
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 enables high-quality image formation with improved drying properties and storage stability, reducing bleeding and adhesion issues, while maintaining uniformity and density, even at high printing speeds and resolutions.
Implementation Method 1
pretreatment solutions that form a layer (ink aggregation layer) that causes intentional aggregation of the solid components such as colorants and resins contained in the aqueous inkjet ink, thereby preventing bleeding between liquid droplets and color irregularities
Implementation Method 2
the organic solvent contains a compound having one or more hydroxyl groups in each molecule, wherein the organic solvent having a surface tension at 25°C of from 20 to 32 mN/m
Implementation Method 3
the pretreatment solution comprises an inorganic metal salt and/or an organic metal salt, an organic solvent and a surfactant
Implementation Method 4
the ink dries as a result of the liquid components penetrating into the recording medium and/or evaporating from the recording medium, thereby fixing the ink to the recording medium and forming the pattern
Data Source
AI summary
A pretreatment solution which is used together with an aqueous inkjet ink that contains at least a pigment, wherein the pretreatment solution contains an organic solvent, and an inorganic metal salt and/or an organic metal salt that exists in a dissolved state, the organic solvent contains a compound having one or more hydroxyl groups in each molecule, and the amount of the organic solvent is from 0.1 to 50% by weight based on the total weight of the pretreatment solution.