Inkjet Printing Method for Permeative Substrates Using Differential Heating
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Solution Overview
Problem
Inkjet printing on permeative substrates like fabric and cloth results in poor coloring due to ink permeation, and sticky inks degrade discharging stability and abrasion resistance.
Innovation Solution
A printing method involving the discharge of ink onto a substrate, followed by selective heating of the non-ink and ink-discharged sides, using an ink composition with specific organic solvents and resin proportions to maintain image quality and stability, where the ink contains an organic solvent A with a boiling point below 250°C, an organic solvent B with a boiling point above 250°C, and a resin, with a viscosity range that prevents permeation and enhances drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sticky ink is used to enhance coloring on permeative substrates, then coloring quality improves, but discharging stability and abrasion resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by controlling the proportion of organic solvent A (boiling point <250°C) to be 30% or less and organic solvent B (boiling point ≥250°C) to be 1-3%, along with resin content of 5-15%. This parameter optimization prevents excessive stickiness while maintaining adequate coloring performance on permeative substrates.
Solution Approach 2:
The patent uses a composite ink formulation combining multiple organic solvents with different boiling points and resin components. This composite approach creates a balanced ink system that provides both sufficient adhesion for coloring and appropriate flow characteristics for discharging stability.
2Ease of manufacture
If ink is discharged to permeative substrates, then printing process is simple, but coloring quality deteriorates due to ink permeation
Solution Approach 1:
The patent optimizes ink parameters including viscosity (8.0-11.0 mPa-s at 25°C, 5.5-11.0 mPa-s at 36°C) and solvent composition to control the balance between ink flow and permeation resistance. This allows simple printing processes while preventing excessive ink absorption by permeative substrates.
Solution Approach 2:
The patent uses a droplet-based ink discharge system where precise control of droplet volume (2.5 μL) and shrinkage rate (to 0.1 μL or less in 10 seconds) replicates optimal ink placement patterns that prevent permeation while maintaining printing simplicity.
3Productivity
If heating temperature difference between ink-discharged side and non-ink side is large, then drying efficiency improves, but image quality deteriorates
Solution Approach 1:
The patent optimizes the temperature difference parameter between T1 (non-ink side) and T2 (ink-discharged side) to satisfy 0≤T2-T1≤90°C. This controlled temperature gradient achieves adequate drying efficiency while preventing excessive heat-induced image degradation such as bleeding or distortion.
Solution Approach 2:
The patent applies different heating conditions to different regions of the substrate: the ink-discharged side receives heating at T2 while the non-ink side receives heating at T1. This localized quality approach ensures proper drying of inked areas without causing overall substrate overheating that would compromise image quality.
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 excellent image quality and discharging stability on permeative substrates by controlling ink viscosity and drying properties, while preventing ink permeation and improving abrasion resistance.
Implementation Method 1
heating a non-ink-discharged side of the substrate at a temperature of T1, and heating an ink-discharged side of the substrate at a temperature of T2
Implementation Method 2
the ink contains an organic solvent A having a boiling point of lower than 250 degrees C., an organic solvent B having a boiling point of 250 degrees C. or higher
Data Source
AI summary
A printing method includes discharging ink to a substrate, heating a non-ink-discharged side of the substrate at T1, and heating an ink-discharged side of the substrate at T2, wherein the ink contains an organic solvent A (boiling point lower than 250 degrees C.), an organic solvent B (boiling point of 250 degrees C.), and a resin, where 0 degrees C. C≤T2−T1≤90 degrees C. is satisfied, the proportion (organic solvent A/ink) is 30 percent by mass or less, the proportion (organic solvent B/ink) is 1 to 3 percent by mass, the proportion (resin/ink) is 5 to 15 percent by mass, the ink has a viscosity of 8.0 to 11.0 mPa-s at 25 degrees C. and 5.5 to 11.0 mPa-s at 36 degrees C., and a 2.5 μL ink droplet discharged to the substrate shrinks to 0.1 μL within 10.0 seconds at 25 degrees C.