Ink Set Dynamic Surface Tension Control for Image Density and Bleeding Resistance
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Solution Overview
Problem
Existing ink jet recording technologies face challenges in achieving high image density and bleeding resistance, as they often require a trade-off between image density and bleeding resistance, and are influenced by the type of recording medium, with previous techniques failing to adequately address changes in ink conditions on the medium.
Innovation Solution
An ink set comprising a pigment ink with a surfactant, self-dispersion pigment, and a poor medium or salt, and a dye ink with specific dynamic surface tension characteristics, designed to maintain high dynamic surface tension at 50 milliseconds and adjust accordingly to improve image density and bleeding resistance across various recording mediums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the permeability of inks into the recording medium is controlled to leave coloring materials in a larger quantity, then image density is improved, but the inks take more time to dry causing set-off and reduced bleeding resistance
Solution Approach 1:
The patent applies parameter changes by carefully controlling the dynamic surface tension of the dye ink within a specific range (40-50 mN/m) and the permeability of pigment ink (0.5-2.0 mm²/s). These parameter optimizations allow the ink to achieve sufficient image density while maintaining appropriate drying characteristics, resolving the trade-off between image density and drying time.
2Quantity of substance
If inks are applied in a large quantity to secure a large area factor, then image density is improved, but the inks take more time to dry causing set-off during continuous recording
Solution Approach 1:
The patent optimizes the application quantity parameters by controlling the dynamic surface tension of dye ink (40-50 mN/m) and pigment ink permeability (0.5-2.0 mm²/s). This allows achieving sufficient area factor with optimized ink quantity, preventing both set-off during continuous recording and excessive drying time.
3Reliability
If the permeability of inks into a recording medium is improved to prevent blurring, then bleeding resistance is improved, but coloring materials less remain on the recording medium resulting in insufficient image density
Solution Approach 1:
The patent resolves this contradiction by optimizing two key parameters: dynamic surface tension of dye ink (40-50 mN/m) and pigment ink permeability (0.5-2.0 mm²/s). The controlled permeability prevents excessive blurring and maintains bleeding resistance, while the optimized surface tension ensures sufficient coloring material remains on the recording medium surface to achieve high image density.
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 ink set achieves superior image density and bleeding resistance without regard to the type of recording medium, by controlling the aggregation and permeation of the pigment ink and dye ink, ensuring effective coverage and prevention of bleeding.
Implementation Method 1
a dynamic surface tension of the pigment ink at a lifetime of 50 milliseconds is higher than 47 mN/m
Implementation Method 2
control the permeability of inks into the recording medium
Implementation Method 3
the composition of the pigment ink is designed so as to make coloring materials highly associative or aggregative
Implementation Method 4
improve the permeability of inks into a recording medium
Data Source
AI summary
In an ink set having a plurality of inks, the ink set has at least a pigment ink and a dye ink. The pigment ink contains at least water, a surfactant, a self-dispersion pigment, and a poor medium for self-dispersion pigment and/or a salt; a dynamic surface tension of the pigment ink at a lifetime of 50 milliseconds is higher than 47 mN/m. The dye ink contains at least water, a surfactant and a dye. An ink set is provided which can obtain images having a high image density and a superior bleeding resistance without regard to the types of recording mediums.