Oil Ink Set for High Color Saturation on PVC
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Solution Overview
Problem
Conventional oil inkjet printers face challenges in achieving high color reproduction capabilities and color saturation on polyvinyl chloride base materials, with existing oil ink compositions falling short in comparison to aqueous inks.
Innovation Solution
An oil ink set comprising specific combinations of magenta, yellow, cyan, and black inks, each with unique reflectivity spectra and hue angles, combined with polyoxyethylene glycol dialkyl ether solvents and cyclic ester solvents, to enhance color reproduction and saturation, with the use of (meth)acrylic resin as a fixing agent to improve print stability and drying capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oil ink compositions are used for inkjet printing on polyvinyl chloride base materials, then robustness of coloring materials is improved, but color reproduction capabilities and color saturation deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the reflectivity spectra of each ink in the set. Specifically, it defines that in the wavelength region where the reflectivity of the first ink changes from 80% to 5%, the reflectivity of the second ink must be continuously higher, and similarly for the third ink relative to the second. This spectral parameter control enables both robustness and high color reproduction capabilities to be achieved simultaneously.
2Reliability
If conventional oil ink compositions are used for inkjet printing on polyvinyl chloride base materials, then robustness of coloring materials is improved, but stability upon printing and ability of prints to be dried deteriorate
Solution Approach 1:
The patent uses composite materials by combining multiple inks with specifically controlled reflectivity characteristics into an ink set. The composite ink set comprises at least three inks (first, second, and third inks) whose reflectivity spectra are coordinated according to the invention's criteria, creating a system that achieves both robustness and stability upon printing that cannot be obtained with conventional single-ink or uncoordinated multi-ink compositions.
3Reliability
If conventional oil ink compositions are used for inkjet printing on polyvinyl chloride base materials, then robustness of coloring materials is improved, but ability of prints to be dried deteriorates
Solution Approach 1:
The patent applies parameter changes by defining specific reflectivity spectral parameters for each ink in the set. The coordinated control of reflectivity across different wavelength regions for multiple inks creates an optimized drying characteristic that maintains robustness while significantly improving the ability of prints to be dried compared to conventional oil ink compositions.
4Reliability
If conventional oil ink compositions are used for inkjet printing on polyvinyl chloride base materials, then robustness of coloring materials is improved, but ink storage stability deteriorates
Solution Approach 1:
The patent uses composite materials by formulating an ink set where multiple inks with specifically coordinated reflectivity spectra are combined. This composite ink set structure, with its controlled spectral relationships, achieves both robustness and improved ink storage stability, resolving the contradiction between these two properties.
5Manufacturing precision
If aqueous inks are used for indoor inkjet printing, then color saturation is improved, but robustness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the reflectivity spectral parameters of oil inks to match and exceed the color saturation performance of aqueous inks. By defining that the reflectivity of successive inks must be continuously higher in specific wavelength regions, the invention achieves high color saturation with oil inks while maintaining their inherent robustness advantage.
Data Source
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AI summary
The object of the invention is to provide an oil ink set capable of obtaining images having high color reproduction capabilities and high color saturation in particular. The oil ink set of the invention comprises a first, a second, and a third oil ink having a wavelength region in which the reflectivity of each oil ink on a recording medium changes from 80% to 5% in the wavelength range of 400 nm to 700 nm. In this wavelength region, the reflectivity of the first oil ink is continuously higher than that of the first oil ink, and in the wavelength in which the reflectivity of the second oil ink changes from 80% to 5%, the reflectivity of the third oil ink is continuously higher than that of the second oil ink. Moreover, the coloring materials in the first, the second and the third oil inks are all different.