Ink and Processing Liquid Set for Image Quality Control
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Solution Overview
Problem
Inkjet recording methods face challenges in achieving optimal image quality on various paper types due to issues like color bleed, beading, and blocking, particularly on plain and coated papers, where the aggregation reaction of processing liquids with inks can lead to poor image density and saturation, and excessive reactivity can damage application members.
Innovation Solution
An ink and processing liquid set is developed, where the ink contains a urethane resin, styrene-acrylic resin, and a pigment, with specific surface tension ratios between the ink and processing liquid to ensure uniform wet-spreading and aggregation, reducing color bleed and blocking, and enhancing fixability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a processing liquid with high reactivity is used to enhance aggregation reaction with ink, then image density and saturation improve, but application members are damaged
Solution Approach 1:
The patent changes the chemical composition parameters of the processing liquid by incorporating specific surfactants and controlling the concentration of multivalent metal salts. This modification reduces the reactivity aggressiveness while maintaining effective aggregation with ink, thereby preventing damage to application members like rollers and belts while still achieving sufficient image density and saturation.
Solution Approach 2:
The patent introduces surfactants as intermediary substances between the multivalent metal salt and the ink. These surfactants mediate the aggregation reaction, allowing the processing liquid to effectively aggregate ink particles for good image density while the surfactant layer protects application members from direct contact with highly reactive metal salts.
2Manufacturing precision
If processing liquid is applied to enhance ink aggregation, then image quality improves, but color bleed and beading occur
Solution Approach 1:
The patent optimizes the surface tension parameters of the processing liquid by carefully selecting and combining surfactants. This parameter adjustment ensures that the processing liquid has appropriate wettability to promote ink aggregation for good image quality while maintaining enough surface tension to prevent excessive spreading that would cause color bleed and beading.
Solution Approach 2:
The patent creates local quality differences in the processing liquid application by controlling the distribution and concentration of surfactants. This allows effective aggregation in the ink deposition areas while maintaining boundaries that prevent color bleed into adjacent areas, thus improving image quality without causing harmful spreading effects.
3Manufacturing precision
If processing liquid composition is optimized for aggregation, then image density improves, but gloss and dryness are compromised
Solution Approach 1:
The patent uses a composite formulation of the processing liquid containing multiple components including multivalent metal salts, surfactants, and other additives in specific proportions. This composite composition enables simultaneous achievement of ink aggregation for image density while the surfactant and additive components contribute to surface gloss and drying properties, resolving the trade-off between these properties.
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 effectively reduces color bleed and blocking, improves image density and saturation, and enhances fixability on both plain and coated papers, while maintaining the stability of application members.
Implementation Method 1
0.5≤B/C≤0.7, where B represents a static surface tension of the ink and C represents a static surface tension of the processing liquid; and 0.5≤E/D≤0.9, and 35 (mN/m)≤E≤55 (mN/m), where D represents a dynamic surface tension at 15 ms of the processing liquid and E represents a dynamic surface tension at 1500 ms of the processing liquid
Data Source
AI summary
An ink and processing liquid set contains a processing liquid to be applied to a recording medium, the processing liquid including a multivalent metal salt and an ink to be applied to an area of the recording medium where the processing liquid has been applied, the ink including a urethane resin, a styrene-acrylic resin, and a pigment, wherein the following relations are satisfied: 0.5≤B/C≤0.7, where B represents a static surface tension of the ink and C represents a static surface tension of the processing liquid; and 0.5≤E/D≤0.9, and 35 (mN/m)≤E≤55 (mN/m), where D represents a dynamic surface tension at 15 ms of the processing liquid and E represents a dynamic surface tension at 1500 ms of the processing liquid.