Ink Set Surfactant Balance for Low-Absorption Substrates
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Solution Overview
Problem
Inkjet recording methods using water-based inks on record-receiving materials with low ink absorption capacity often result in bleeding and mottling phenomena, which are difficult to suppress, especially when using materials without an ink receiving layer.
Innovation Solution
An ink set comprising yellow, magenta, cyan, and black inks with specific ranges of silicone surfactant content, between 1.0% and 2.5% for S1, 0.1% to 0.8% for S1 - S2, 0.0% to 0.5% for S3 - S2, and 0.2% to 1.2% for S3 - S4, along with appropriate pigments and additives, is used to minimize bleeding and mottling on low absorption capacity materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water-based pigment ink is used on record-receiving material without ink receiving layer, then recording can be performed on general-purpose plain paper, but bleeding and mottling phenomena occur
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by introducing specific surfactants (anionic or nonionic) and alkane diols in controlled amounts. This modifies the ink's surface tension and wettability characteristics, enabling it to perform well on both coated and uncoated materials without causing bleeding or mottling, thus resolving the contradiction between versatility and image uniformity.
Solution Approach 2:
The patent uses surfactants and alkane diols as intermediary substances that mediate between the ink and the record-receiving material. These additives act as bridges, improving ink penetration and distribution on uncoated materials while preventing excessive spreading that causes bleeding, thereby maintaining image quality across different material types.
2Manufacturing precision
If surfactant and polymer are added to ink to suppress bleeding and mottling, then image quality improves, but ink composition complexity increases
Solution Approach 1:
The patent specifies precise concentration ranges for surfactants (0.1-5 mass%) and alkane diols (1-10 mass%) in the ink formulation. By optimizing these parameters within defined boundaries, the patent achieves effective suppression of bleeding and mottling while avoiding excessive complexity in the ink composition, maintaining manufacturability.
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 effectively reduces bleeding and mottling, ensuring high-quality images on both standard and unabsorbent record-receiving materials, maintaining image smoothness and robustness with excellent abrasion, water, light, and ozone resistance.
Implementation Method 1
each of which comprises at least water, a silicone surfactant and a coloring agent
Implementation Method 2
contents of the silicone surfactant in total masses of the yellow ink, the magenta ink, the cyan ink and the black ink are respectively represented as S1, S2, S3 and S4
Data Source
AI summary
Provided is an ink set that comprises at least four colored inks, that is unlikely to cause bleeding or mottling even when used to record on a recording material having low ink absorption ability, and that yields a recorded image having high print density. The ink set comprises at least four colored inks that include a yellow ink, a magenta ink, a cyan ink, and a black ink and that each contain water, a surfactant, and a colorant. When each of the surfactant contents in each of the total masses of the yellow ink, the magenta ink, the cyan ink, and the black ink is represented respectively by S1, S2, S3, and S4, S1 satisfies 1.0 mass% ≤ S1 ≤ 2.5 mass%, S1 - S2 satisfies 0.1 mass% ≤ S1 - S2 ≤ 0.8 mass%, S3 - S2 satisfies 0.0 mass% ≤ S3 - S2 ≤ 0.5 mass%, S3 - S4 satisfies 0.2 mass% ≤ S3 - S2 ≤ 1.2 mass%, and S3 and S4 are each 0.1 mass% or more.