Ink Set Optimizing Light and Ozone Resistance Balance
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Solution Overview
Problem
Ink sets for ink-jet recording face challenges in achieving simultaneous satisfactory light fastness and ozone resistance, leading to disruption of color fading balance when prints are exposed to both light and ozone over time.
Innovation Solution
The ink set is formulated with specific color inks that satisfy certain optical density reduction rate criteria through controlled light and ozone resistance tests, ensuring the total OD reduction rate is less than 40% and the difference between maximum and minimum total OD reduction rates is less than 15%, thereby minimizing color fading and maintaining balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color inks with good light fastness are selected, then light resistance is improved, but ozone resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of colorants by selecting specific cyan, magenta, and yellow dyes/pigments with balanced molecular structures that exhibit both good light fastness and ozone resistance. This parameter optimization resolves the contradiction by finding colorant formulations that simultaneously satisfy both resistance requirements rather than prioritizing one over the other
Solution Approach 2:
The patent employs composite ink formulations combining multiple colorants (cyan, magenta, yellow) with carefully selected properties. By creating a composite system where different colorants work together, the patent achieves overall good light fastness and ozone resistance across the complete color printout, balancing the contradictory requirements through material composition
2Object-affected harmful factors
If color inks with good ozone resistance are selected, then ozone resistance is improved, but light fastness deteriorates
Solution Approach 1:
The patent optimizes the chemical parameters of colorants by selecting specific cyan, magenta, and yellow dyes/pigments with balanced molecular structures that exhibit both good light fastness and ozone resistance. This parameter optimization resolves the contradiction by finding colorant formulations that simultaneously satisfy both resistance requirements rather than prioritizing one over the other
Solution Approach 2:
The patent employs composite ink formulations combining multiple colorants (cyan, magenta, yellow) with carefully selected properties. By creating a composite system where different colorants work together, the patent achieves overall good light fastness and ozone resistance across the complete color printout, balancing the contradictory requirements through material composition
3Manufacturing precision
If conventional ink sets are used, then initial color quality is achieved, but color fading balance is disrupted over time
Solution Approach 1:
The patent applies preliminary action by pre-selecting and formulating colorants with specifically balanced light fastness and ozone resistance properties before the printing process. This advance preparation ensures that the color printout maintains balanced color fading characteristics over time when exposed to both light and ozone, preventing future color disruption rather than correcting it later
Solution Approach 2:
The patent optimizes the chemical parameters of colorants by selecting specific cyan, magenta, and yellow dyes/pigments with balanced molecular structures that exhibit both good light fastness and ozone resistance. This parameter optimization resolves the contradiction by finding colorant formulations that simultaneously satisfy both resistance requirements rather than prioritizing one over the other
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
This approach effectively suppresses significant color fading and maintains a satisfactory color fading balance even when prints are exposed to both light and ozone, ensuring minimal change in colors over time.
Implementation Method 1
irradiating the first single-color patch at an illuminance of 93 klx with light, emitted from a xenon lamp
Implementation Method 2
exposing the second single-color patch to an atmosphere with an ozone concentration of 2 ppm
Data Source
AI summary
An ink set for ink-jet recording includes a plurality of color inks, wherein the following formulae (a) to (d) are satisfied.Light OD reduction rate (X %)=[(A−B)/A]×100 (a)Ozone OD reduction rate (Y %)=[(C−D)/C]×100 (b)Total OD reduction rate (Z %)=X+Y<about 40% (c)Zmax−Zmin<about 15% (d)“A” and “B” are OD values before and after a light fastness test for a first single-color patch, respectively, and “c” and “D” are OD values before and after an ozone resistance test for a second single-color patch, respectively. “Zmax” and “Zmin” are a maximum and a minimum of all the total OD reduction rates (Z), respectively.