Ink Set Ionic Composition for Bleeding Prevention
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Solution Overview
Problem
Ink-jet recording technologies face challenges in preventing bleeding between achromatic and chromatic color inks at boundary portions, which affects the quality of color images.
Innovation Solution
An ink set comprising an achromatic color ink with potassium, lithium, and sodium ions, and a chromatic color ink with specific ion concentration ratios, where the achromatic ink has a higher potassium ion ratio and the chromatic ink has a lower potassium ion ratio, effectively preventing bleeding by controlling ionic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content amount of water-soluble solvent in each ink is adjusted to suppress bleeding, then bleeding is reduced, but the complexity of ink formulation increases
Solution Approach 1:
The patent applies parameter changes by adjusting the ionic composition parameters of the inks. Specifically, it controls the concentration ratios of potassium ions, lithium ions, and sodium ions in both achromatic and chromatic inks. By optimizing these ionic parameters within specific ranges, the patent achieves effective bleeding prevention while maintaining manageable ink formulation complexity.
2Reliability
If different ion concentrations are used in achromatic and chromatic inks to prevent bleeding, then bleeding is suppressed, but the manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for ionic concentrations to balance bleeding prevention with manufacturing feasibility. For achromatic ink, the potassium ion concentration ratio Ka/(Lia+Naa+Ka) is controlled at 0.6 or higher, while for chromatic ink, the ratio Kc/(Lic+Nac+Kc) is controlled at 0.6 or lower. These parameter specifications enable effective bleeding suppression while maintaining reasonable manufacturing precision requirements.
Data Source
AI summary
An ink set for ink-jet recording includes an achromatic color ink containing potassium ion and at least one of lithium ion and sodium ion; and a chromatic color ink containing at least one selected from the group consisting of: the potassium ion, the lithium ion and the sodium ion, wherein the ink set satisfies Condition (X): Ka/(Lia+Naa+Ka)>0.7, and Condition (Y): Kc/(Lic+Nac+Kc)<0.6.