Thermal Ink Jet Ink Composition for Fast Drying and Adhesion
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Solution Overview
Problem
Commercial thermal ink jet systems face issues with long ink dry times and poor adhesion to semi-porous and non-porous substrates due to the limitations of water-based inks, necessitating the development of inks with improved performance characteristics.
Innovation Solution
A thermal ink jet ink composition comprising volatile organic solvents, solvent dyes soluble in these solvents, and humectants, which is free or substantially free of tetrahydrofuran, binder resin, and water, allowing for short dry times and long decap times with good adhesion to various substrates without requiring heat assist.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-based inks are used in thermal ink jet systems, then the ink can be easily vaporized and printed, but the ink dry time becomes long and adhesion to substrates becomes poor
Solution Approach 1:
The patent changes the fundamental parameter of the solvent from water to volatile organic compounds (VOCs) such as alcohols, ketones, esters, and ethers. This parameter change fundamentally alters the evaporation characteristics and adhesion properties, achieving both fast dry times and good adhesion while maintaining thermal ink jet compatibility
Solution Approach 2:
The patent creates a composite ink formulation combining multiple VOC solvents with specific dyes and additives. This composite approach optimizes the balance between evaporation rate, adhesion, and print quality, resolving the contradiction between fast drying and maintaining print performance
2Productivity
If water-based inks are used in thermal ink jet systems, then the ink can be easily vaporized and printed, but adhesion to semi-porous and non-porous substrates becomes poor
Solution Approach 1:
The patent changes the solvent parameter from water to VOCs with different surface tension and molecular structure. These parameter changes enable the ink to penetrate and bond with semi-porous and non-porous substrates effectively, achieving strong adhesion while maintaining easy vaporization for printing
Solution Approach 2:
The patent develops a complete ink formulation that replicates the successful thermal vaporization mechanism of water-based inks while using VOCs as the solvent base. This copying approach maintains the simplicity and efficiency of thermal printing while achieving superior adhesion through the different chemical properties of VOCs
3Ease of operation
If traditional thermal ink jet inks are used, then the printing process is simple and efficient, but the ink requires heat assist for drying which increases process complexity
Solution Approach 1:
The patent formulates the ink with VOC solvents that evaporate at ambient temperatures without requiring external heat assist. The ink composition itself provides the drying mechanism through the natural evaporation of volatile components, eliminating the need for additional heating devices or complex drying processes while maintaining printing simplicity
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 composition achieves short unassisted dry times, extended decap times, and excellent adhesion to both semi-porous and non-porous substrates, enhancing material compatibility and safety, while maintaining the efficiency of thermal ink jet printing.
Implementation Method 1
Thermal ink jet (TIJ) print heads produce ink droplets from thermal vaporization of the ink solvent. In the jetting process, a resistor is heated rapidly to produce a vapor bubble which subsequently ejects a droplet from the orifice.
Implementation Method 2
The invention provides a thermal ink jet ink composition including one or more volatile organic solvents... The thermal ink jet ink composition may provide increased decap time and short dry times.
Data Source
AI summary
A solvent-based ink composition for a thermal inkjet printhead includes (a) 55-90 wt. % of an organic solvent including a ketone and a C1 to C4 alcohol; and (b) 0.01-10 wt. % of a colorant.