Ink Set Granularity via Pigment Density Ratio
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Solution Overview
Problem
Previous ink sets for inkjet recording methods tend to degrade the granularity of printed images, despite various attempts to improve quality, resulting in insufficiently high-quality images.
Innovation Solution
An ink set comprising a magenta ink composition and a light magenta ink composition with specific pigment densities, using C.I. Pigment Violet 19 and C.I. Pigment Red 122 respectively, and employing resin or surfactant dispersants to enhance granularity, with a preferred density ratio of 4:3 to 14:1, is used in conjunction with an inkjet recording method that ejects droplets onto a recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ink sets are used for inkjet recording, then printing can be performed with high speed and relatively inexpensive apparatus, but the granularity of the recorded images is degraded
Solution Approach 1:
The patent applies parameter changes by carefully controlling the pH range (5.0-7.0) and pigment concentration (0.01-5.0% by weight) of the aqueous pigment ink compositions. Different pH ranges and concentration levels are used for different color inks (cyan, magenta, yellow, black) to optimize both image quality and printing performance, thereby improving granularity while maintaining printing speed
Solution Approach 2:
The patent uses composite materials by combining specific pigments with aqueous carriers and optional polymers to create optimized ink formulations. The ink set comprises multiple aqueous pigment ink compositions with different pigment types (cyan, magenta, yellow, black) and complementary formulations, creating a composite system that achieves excellent granularity across the entire color range while maintaining high-speed printing capability
2Manufacturing precision
If various means are tried to improve granularity, then image quality may be enhanced in some aspects, but sufficient quality images have not been obtained
Solution Approach 1:
The patent applies local quality by optimizing each color ink composition individually with specific pigment types and concentration ranges tailored to each color's requirements. Each aqueous pigment ink (cyan, magenta, yellow, black) has its own optimized formulation parameters, allowing granular control over the quality characteristics of different color regions in the printed image, resulting in consistently high overall image quality
Solution Approach 2:
The patent systematically varies critical parameters including pH range (5.0-7.0), pigment concentration (0.01-5.0% by weight), and pigment type selection for each color to achieve optimal and consistent image quality. This controlled parameter adjustment ensures reliable reproduction of high-quality images across different printing conditions
Data Source
AI summary
An ink set includes at least a magenta ink composition and a light magenta ink composition. The light magenta ink composition is formed with a pigment density lower than a pigment density of the magenta ink composition. A pigment used in the magenta ink composition is C.I. Pigment Violet 19, and a pigment used in the light magenta ink composition is C.I. Pigment Red 122.