Black Ink Dye Composition for High Optical Density at Low Ink Volume
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Solution Overview
Problem
Existing black inks for inkjet printing on polyester fabrics tend to lose intensity and become lighter when less ink is used, leading to suboptimal printing quality and speed.
Innovation Solution
A black ink formulation comprising a mixture of disperse blue 291, disperse red 82, and disperse red 54 dyes, which maintains high optical density even with reduced ink amounts, allowing for increased printing definition and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional black ink formulations are used, then good color intensity is achieved with large amounts of ink, but the ink rapidly lightens to grey when lower amounts are used
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by using a specific mixture of disperse dyes (disperse blue 291 and/or 291:1, disperse red 82, and disperse red 54) in optimized proportions. This chemical parameter change enables the ink to maintain high optical density even at lower concentrations, resolving the contradiction between ink amount and color intensity
Solution Approach 2:
The patent creates a composite dye system by combining multiple disperse dyes with complementary color properties. The specific combination of blue and red disperse dyes produces a black ink that maintains intensity at lower volumes, solving the problem of rapid lightening when less ink is applied
2Illumination intensity
If larger amounts of ink are deposited to maintain intensity, then good color intensity is achieved, but printing speed and definition decrease
Solution Approach 1:
By changing the chemical composition to a optimized mixture of disperse dyes, the ink achieves higher intensity per unit volume. This allows smaller ink drops to produce the same visual intensity, enabling faster ejection frequencies and higher printing speed while maintaining color intensity
3Illumination intensity
If larger amounts of ink are deposited to maintain intensity, then good color intensity is achieved, but printing definition deteriorates
Solution Approach 1:
The changed chemical parameters of the ink formulation allow concentrated color intensity in smaller ink volumes. This enables precise printing with well-defined edges and higher resolution, as smaller drops can be positioned more accurately without requiring large ink amounts to maintain intensity
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 set achieves high optical densities at lower printing resolutions and higher ejection frequencies, ensuring intense black coloration without significant lightening, even with smaller ink volumes, thus enhancing printing definition and speed.
Implementation Method 1
A black ink comprising a mixture of the dyes disperse blue 291 and/or 291:1, disperse red 82 and disperse red 54... gives the fabrics a high optical density coloration
Data Source
AI summary
The invention relates to a black ink comprising a black dye dispersion in an aqueous vehicle comprising disperse blue 291 and/or 291:1, disperse red 82 and disperse red 54 and the use of such black ink in a method for digital inkjet-printing of a fabric, preferably on polyester.