Disperse Black Ink Composition for Light-Fast Polyester Printing
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Solution Overview
Problem
Existing inkjet printing technologies for fabrics, particularly those using disperse dyes, face challenges with light-fastness and color degradation due to exposure, resulting in a loss of intensity and shade change over time.
Innovation Solution
A black ink formulation comprising a specific mixture of disperse dyes (disperse blue 165, disperse orange 29, and disperse blue 60) dispersed in an aqueous vehicle, optimized for inkjet printing on polyester fabrics, which maintains intense color strength and high light-fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional disperse dye mixtures are used for black inkjet printing on polyester, then the ink can be applied and initial color strength is achieved, but the color degrades under light exposure losing intensity and changing shade
Solution Approach 1:
The patent changes the chemical parameters of the dye mixture by selecting specific disperse dyes (disperse blue 165, disperse orange 29, disperse red 82, and disperse blue 60) with particular molecular structures and light-absorption properties. This parameter change in dye composition resolves the contradiction by achieving both good initial color strength and high light-fastness, preventing color degradation under light exposure
Solution Approach 2:
The patent creates a composite dye system by combining four different disperse dyes in specific proportions. This composite approach allows the mixture to benefit from the complementary light-fastness properties of each individual dye, achieving superior overall light-fastness and color stability that none of the individual dyes could provide alone, while maintaining ease of manufacture through a standardized ink formulation
2Productivity
If existing black ink formulations are used, then printing can be performed on polyester fabrics, but the printed color shows degradation and shade change after light exposure
Solution Approach 1:
The patent converts the potentially harmful effect of light exposure into a beneficial demonstration of the dye mixture's superior light-fastness. By carefully selecting dyes that are inherently resistant to photo-degradation, the formulation transforms what would normally be a damaging condition into a test that validates the high light-fastness index and color stability of the printed fabric
Solution Approach 2:
The patent modifies the chemical composition parameters of the ink by using a specific quadruple dye mixture rather than conventional single or dual dye formulations. This parameter change ensures that the printed color maintains its intensity and shade after light exposure, eliminating color degradation while preserving printing efficiency through optimized ink jetting properties
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 inkjet printing method using this black ink formulation achieves a high light-fastness index, ensuring the printed color remains resistant to degradation and maintains its intensity, significantly improving the quality and longevity of the printed fabric.
Implementation Method 1
there is a small channel surrounded by a piezoelectric crystal below each nozzle; an electric pulse causes the crystal to deform and consequently to suddenly throttle the small channel and to eject the ink
Implementation Method 2
at each nozzle, there is a resistor through which current pulses are supplied; at each pulse, the resistor heats to the temperature of some hundred degrees in few microseconds, and generates in the ink in contact with it a vapor bubble. The expansion of the latter causes the ejection of a drop from the overlying nozzle
Data Source
AI summary
The invention refers to a disperse black ink comprising: an aqueous vehicle and a black dye dispersion comprising: disperse blue 165, disperse orange 29, disperse red 82 and disperse blue 60, and the use of such black ink in a method for inkjet-printing on a fabric.