Solvent-Based Ink Composition for Stable Jetting and Abrasion Resistance
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Solution Overview
Problem
The ink jet recording method experiences stability issues and image quality degradation due to aggregation irregularity and reduced abrasion resistance when using water-based ink compositions on low- or non-absorbing recording media, particularly with the coffee stain phenomenon.
Innovation Solution
A recording method involving a water-based ink composition with an organic compound that is solid at 25°C, having a standard boiling point of 280°C or less and high solubility in water, along with a primary and optional secondary heating step, to stabilize ink ejection and enhance abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a water-based ink composition containing two types of waxes and a reaction liquid with an aggregating agent is used to improve abrasion resistance, then abrasion resistance is improved, but ejection stability is degraded and aggregation irregularity occurs
Solution Approach 1:
The patent extracts and removes the problematic components (waxes and aggregating agents) from the ink composition. By using a solvent-based ink without these components, the invention eliminates the root cause of aggregation irregularity while maintaining ejection stability, thereby resolving the contradiction between abrasion resistance and ejection stability.
Solution Approach 2:
The patent changes the fundamental parameters of the ink composition by switching from water-based to solvent-based formulation, and from containing waxes/aggregating agents to being free thereof. This parameter change fundamentally alters the ink's behavior, preventing aggregation irregularity while maintaining stable ejection, thus resolving the technical contradiction.
2Strength
If a water-based ink composition with waxes and aggregating agent is used to improve abrasion resistance, then abrasion resistance is improved, but image quality is degraded due to aggregation irregularity
Solution Approach 1:
The patent removes the problematic waxes and aggregating agents from the ink composition. This extraction eliminates the cause of aggregation irregularity that degrades image quality, while the solvent-based formulation provides uniform drying and consistent image formation, thereby resolving the contradiction between abrasion resistance and image quality.
Solution Approach 2:
The patent fundamentally changes the ink composition parameters by using a solvent-based system without waxes or aggregating agents. This parameter change ensures uniform ink distribution and drying, preventing aggregation irregularity and maintaining high image quality while still achieving adequate abrasion resistance through the solvent-based formulation.
3Object-affected harmful factors
If water-based ink is used on low- or non-absorbing recording media for environmental protection, then environmental friendliness is improved, but coffee stain phenomenon occurs and image quality is degraded
Solution Approach 1:
The patent changes the solvent parameter from water-based to organic solvent-based formulation. This parameter change fundamentally alters the drying behavior of the ink, preventing the coffee stain phenomenon that occurs with water-based inks on non-absorbing media. The solvent-based ink provides uniform evaporation and consistent image quality while maintaining environmental considerations through appropriate solvent selection.
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 method ensures stable ink ejection and improved image quality by preventing aggregation irregularity and coffee stain phenomena, while enhancing the abrasion resistance of the recorded matter.
Implementation Method 1
a primary heating step of heating the ink composition adhered to the recording medium in the adhesion step
Implementation Method 2
an organic compound which is a solid at 25° C. having a standard boiling point of 280° C. or less
Data Source
AI summary
A recording method of the present disclosure includes: an adhesion step of ejecting an ink composition from an ink jet head so as to be adhered to a recording medium; and a primary heating step of heating the ink composition adhered to the recording medium in the adhesion step, and the ink composition is a water-based ink containing an organic compound which is a solid at 25° C. having a standard boiling point of 280° C. or less and which has a solubility of 50 [g/100 g of water] or more in water at 25° C.