Glitter Inkjet Overlap Control for Metallic Image Lightfastness
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Solution Overview
Problem
Metallic images produced using glitter inkjet inks suffer from rapid degradation and discoloration due to light exposure, particularly UV rays, leading to reduced gloss and lightfastness issues, with existing additives posing safety and environmental concerns.
Innovation Solution
An inkjet recording method that varies the amount of glitter ink ejected in overlapping regions compared to non-overlapping regions, using a specific ratio and adjusting according to the type and content of color ink, to enhance lightfastness and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a glitter ink containing metal particles is used to produce metallic images, then high shininess and metallic gloss are achieved immediately after printing, but the images deteriorate rapidly under light exposure with reduced gloss and discoloration
Solution Approach 1:
The patent applies different ink compositions to different regions: the glitter ink containing metal particles is applied to specific first regions to create metallic gloss, while a protective ink layer is applied to overlapping regions where the glitter ink intersects with color ink regions. This local differentiation allows the metallic areas to maintain their shine while being protected from light-induced degradation.
Solution Approach 2:
The patent creates a composite structure by layering the glitter ink with metal particles over a color ink base, and then applying a protective ink layer in overlapping regions. This multi-layer composite approach combines the aesthetic properties of metallic glitter with the protective properties of the outer layer, achieving both high initial gloss and improved lightfastness.
2Reliability
If additives such as discoloration inhibitors and UV absorbers are added to glitter ink to prevent degradation, then lightfastness is improved, but safety and environmental friendliness are compromised and ink properties are adversely affected
Solution Approach 1:
The patent removes harmful additives from the glitter ink formulation by using a separate protective ink layer applied in overlapping regions. This extraction approach eliminates the need to include discoloration inhibitors and UV absorbers in the glitter ink itself, thereby maintaining safety and environmental friendliness while still providing protection against light-induced degradation.
Solution Approach 2:
The protective ink layer acts as an intermediary between the glitter ink and the environment (light exposure). This mediator layer provides the lightfastness protection that would otherwise require harmful additives, allowing the glitter ink to remain free of unsafe chemicals while still achieving the desired durability.
3Reliability
If the amount of glitter ink is increased to suppress degradation, then lightfastness is improved, but the complexity of ink composition and printing control increases
Solution Approach 1:
The patent segments the printing process into distinct regions: first regions containing only glitter ink for metallic effects, second regions containing color ink for standard coloring, and overlapping regions where both inks are applied. This segmentation allows precise control of glitter ink quantity in each region, improving lightfastness in overlapping areas without requiring complex formulation changes to the glitter ink itself.
Solution Approach 2:
The patent implements dynamic control of glitter ink ejection based on region type. The ink jet system adjusts the amount of glitter ink ejected differently for first regions versus overlapping regions, with higher amounts in overlapping regions to enhance protection. This dynamic adjustment achieves improved lightfastness through process control rather than complex ink composition.
Data Source
AI summary
An ink jet recording method includes forming a first image by applying by an ink jet method a glitter ink in which a glitter pigment is dispersed to a first region of a recording medium in which the glitter first image is to be formed, and forming a second image by applying by an ink jet method a color ink containing a coloring material to a second region of the recording medium in which the colored second image is to be formed, the amount per unit area of the glitter ink ejected in an overlapping region in which the first region overlaps the second region being larger than the amount per unit area of the glitter ink ejected in the first region excluding the overlapping region.