Phase Change Ink Acoustic Mixing for Dark Substrate Print Quality
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Solution Overview
Problem
There is a need for phase change white inks suitable for ink jet printing that provide excellent print quality on colored substrates, particularly dark colors, with improved storage stability and low Newtonian viscosity, and that can change color under UV light for security features.
Innovation Solution
A process involving acoustic mixing of a white colorant at 30-110 g acceleration, combining it with a phase change ink carrier comprising branched triamide and polyethylene or Fischer Tropsch wax, and optionally adding a fluorescent dye to create a phase change ink that changes color under UV light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixing methods are used for white colorant, then manufacturing process is simple, but print quality on dark substrates is poor
Solution Approach 1:
The patent applies acoustic mixing using ultrasonic vibrations to disperse white colorant particles in the ink carrier. The ultrasonic energy creates cavitation and mechanical vibration that effectively breaks up agglomerates and achieves uniform dispersion, directly improving print quality on dark substrates while maintaining a relatively simple process setup.
2Manufacturing precision
If high pigment concentration is used to improve opacity on dark substrates, then print quality improves, but viscosity increases and jetting performance deteriorates
Solution Approach 1:
The patent optimizes the pigment concentration parameter within a specific range (1-10% by weight) and adjusts the ink carrier composition parameters (phase change materials, surfactants, solvents) to achieve the right balance between opacity and jetting performance. The phase change ink carrier specifically modifies viscosity characteristics to maintain jetability despite pigment loading.
Solution Approach 2:
The patent uses a composite ink carrier system combining phase change materials (waxes, fatty acids), surfactants, and solvents to create a multi-component formulation that provides both sufficient opacity through white pigment dispersion and appropriate viscosity for jetting. The composite structure allows each component to contribute specific properties.
3Adaptability or versatility
If fluorescent dye is added for security features, then ink functionality is enhanced, but ink composition complexity increases
Solution Approach 1:
The patent incorporates fluorescent dye into the phase change ink carrier system, allowing the same ink formulation to serve multiple functions: standard printing, security verification under UV light, and maintaining phase change properties. The fluorescent component is integrated into the existing carrier architecture rather than requiring a separate system.
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 resulting ink achieves excellent print quality on dark substrates, offers improved storage stability, and features a unique color change under UV light, enhancing security and esthetic appeal.
Implementation Method 1
subjecting a white colorant to acoustic mixing at an acceleration of from about 30 to about 110 g
Implementation Method 2
Phase change inks for color printing typically comprise a phase change ink carrier composition which is combined with a phase change ink compatible colorant
Implementation Method 3
optionally, adding a fluorescent dye with stiffing
Data Source
AI summary
A process for preparing a phase change ink including (a) subjecting a white colorant to acoustic mixing at an acceleration of from about 30 to about 110 g; (b) optionally, adding a dispersant and subjecting the white colorant and dispersant to further acoustic mixing at an acceleration of from about 30 to about 110 g; (c) separately melt mixing an optional antioxidant, an optional synergist, and a phase change ink carrier comprising (i) a branched triamide and (ii) a polyethylene wax, a Fischer Tropsch wax, or a mixture or combination thereof, to form a melt mixture; (d) adding the melt mixture of (c) to the acoustically mixed white colorant of (a) or (b) with stirring; (e) optionally, adding a fluorescent dye with stirring; and (d) optionally, filtering the phase change ink.