Inkjet Printing Dot Pattern Dispersibility Rub Resistance
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Solution Overview
Problem
Inkjet printing systems face challenges in achieving high rub resistance and image density due to the surface tension properties of inks, where pigment ink tends to remain on the print medium's surface, leading to weak rub resistance and potential image damage.
Innovation Solution
An image processing apparatus and method that utilize a printing unit to eject inks with different surface tensions, where a first ink with higher surface tension is quantized to produce a dot pattern with higher dispersibility than a second ink, ensuring improved rub resistance and stable high-density image output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pigment ink is used to achieve high image density, then image density is improved, but rub resistance deteriorates because the ink remains on the surface
Solution Approach 1:
The patent changes the surface tension parameter of the ink by selecting ink with lower surface tension to improve permeation into the print medium, preventing the pigment from remaining on the surface while maintaining image density
Solution Approach 2:
The patent uses a solvent as an intermediary substance that facilitates the permeation of pigment ink into the print medium by reducing surface tension, allowing the ink to penetrate deeply without remaining on the surface
2Quantity of substance
If ink with high surface tension is used to maintain pigment on surface for density, then image density is improved, but permeation ability deteriorates
Solution Approach 1:
The patent changes the surface tension parameter from high to low to improve permeation ability, selecting ink with lower surface tension that can penetrate the print medium more effectively
3Reliability
If multiple inks with different surface tensions are printed to improve rub resistance, then rub resistance is improved, but device complexity increases
Solution Approach 1:
The patent makes the image processing apparatus universally applicable to multiple ink types by implementing ink-type-specific quantization processing that can handle different surface tension characteristics without requiring separate dedicated processing systems for each ink type
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 enhances rub resistance and maintains high image density by optimizing the dot patterns of inks with varying surface tensions, preventing pigment ink from remaining on the surface and ensuring smooth image formation.
Implementation Method 1
moisture and a solvent in the ink permeate into the print medium
Data Source
AI summary
An image processing apparatus for printing an image on a print medium by using a printing unit that ejects a first ink in accordance with first quantized data and ejects a second ink in accordance with second quantized data, the image printing apparatus has a first quantization configured to quantize multi-valued data corresponding to the first ink to generate the first quantized data, the multi-valued data indicating intermediate density; and a second quantization unit configured to quantize multi-valued data corresponding to the second ink to generate the second quantized data, the multi-valued data indicating intermediate density. Surface tension of the first ink is larger than surface tension of the second ink, and a first dot pattern printed on the print medium in accordance with the first quantized data has higher dispersibility than a second dot pattern printed on the print medium in accordance with the second quantized data.