Oil-Based Inkjet Ink Reduces Roller Transfer Contamination
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Solution Overview
Problem
Oil-based inkjet inks often suffer from roller transfer contamination and strike-through issues due to the adhesion of ink to printer rollers, leading to contamination of the recording medium and reduced image quality.
Innovation Solution
The development of an oil-based inkjet ink containing colored resin particles, an ionic dispersant, and a non-aqueous solvent, where the colored resin particles comprise a colorant and a urethane-urea resin with a soft segment and hard segment, which reduces roller transfer contamination and improves rub fastness and image density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional oil-based inkjet ink is used, then the ink can be jetted from fine nozzles, but roller transfer contamination occurs and strike-through issues arise due to adhesion of ink to printer rollers
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating specific surfactants and resins that modify the ink's adhesion properties. This allows the ink to have reduced affinity for roller surfaces while maintaining jetability and image quality, directly resolving the roller transfer contamination issue
Solution Approach 2:
The patent introduces surfactants as intermediary substances that mediate between the ink and roller surfaces. These surfactants reduce the adhesion force between ink and rollers, preventing transfer contamination while allowing the ink to maintain its functional properties for jetting and image formation
2Manufacturing precision
If ink adhesion to rollers is increased to improve image density, then rub fastness improves, but roller transfer contamination worsens
Solution Approach 1:
The patent modifies the chemical parameters of the ink composition, specifically the ratios and types of surfactants and resins, to achieve a balanced state where the ink has sufficient adhesion to the recording medium for good image density and rub fastness, while having reduced adhesion to roller surfaces to prevent transfer contamination
Solution Approach 2:
The patent creates different adhesion characteristics for different surfaces: the ink is formulated to have high adhesion to the recording medium (where image quality is needed) while having low adhesion to roller surfaces (where transfer contamination must be prevented). This localized differentiation of adhesion properties resolves the contradiction
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 inkjet ink effectively minimizes roller transfer contamination and enhances the rub fastness and image density of printed items, while maintaining low viscosity and stability, thereby improving the overall printing process.
Implementation Method 1
JP 2011-57812 A discloses the use, in an oil-based inkjet ink, of an encapsulated pigment that has been surface-treated with a comb-like polyurethane compound
Implementation Method 2
removing the water from the water-in-oil emulsion
Implementation Method 3
oil-based inks mainly dry as a result of penetration into the recording medium
Data Source
AI summary
An oil-based inkjet ink is disclosed that contains colored resin particles, an ionic dispersant and a non-aqueous solvent, wherein the colored resin particles contain a colorant and a urethane-urea resin. A method for producing an oil-based inkjet ink is also disclosed.