Dual-Ink Set Composition for Stable Makeup Image Printing
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Solution Overview
Problem
Existing ink-jet printing technologies face challenges in achieving stable ink ejection and high-quality printing, particularly in cosmetic applications, due to issues with ink droplet size, visibility, and granular rough feel, which affect the natural appearance of makeup images.
Innovation Solution
An ink set comprising two kinds of inks that satisfy specific chromaticity conditions in the CIE L*a*b* color space, with controlled droplet sizes between 100 pL and 5,000 pL, is used to enhance ejection stability and achieve high-quality, natural-looking makeup images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink droplet size is reduced to improve printing precision and avoid visibility, then manufacturing precision is improved, but ejection stability deteriorates
Solution Approach 1:
The patent changes the parameter of ink droplet volume to a specific range (100-5000 pL) that simultaneously satisfies both printing precision requirements and ejection stability requirements. This parameter optimization resolves the contradiction by finding the optimal point where droplets are small enough to be invisible and precise, yet large enough to maintain stable ejection.
2Device complexity
If single ink is used to simplify device structure, then device complexity is reduced, but color control capability deteriorates
Solution Approach 1:
The patent segments the color control function into multiple inks (first ink and second ink with different chromaticity characteristics). By dividing the color control task into separate ink components, the system achieves versatile color control capability while keeping each individual ink simple, thus resolving the contradiction between device complexity and color control capability.
3Reliability
If pigment ink is used to improve weathering and water resistance, then durability is improved, but granular rough feel increases
Solution Approach 1:
The patent changes the parameter of ink droplet volume to an optimized range (100-5000 pL) that controls the size and distribution of pigment particles on the substrate. This parameter optimization allows sufficient pigment content for weathering and water resistance while controlling particle aggregation to minimize granular rough feel, achieving both durability and smooth surface finish.
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 allows for easy hue control and stable ejection, resulting in high-quality makeup images with a natural appearance, free from a granular rough feel, by balancing macroscopic uniformity with microscopic non-uniformity.
Implementation Method 1
In ink-jet printing methods, droplets of ink are directly ejected onto a substrate to be printed from very fine nozzles and allowed to adhere to the substrate
Data Source
AI summary
An ink set where a droplet of ink is ejected in an amount of not less than 100 pL and not more than 5,000 pL. The ink set includes at least two inks including an ink A and an ink B and the ink set satisfies conditions 1 to 3 as measured, on a surface of a solid image with a 100% print duty which is printed on a polyester film using the ink A and the ink B, respectively, with respect to coordinates (L*A, a*A, b*A) of the ink A and coordinates (L*B, a*B, b*B) of the ink B in CIE L*a*b* color space.