Ink Jet Recording Method Yield Value Control
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Solution Overview
Problem
Ink jet recording methods face challenges with color bleeding when depositing one color ink over another, leading to indistinct boundaries and reduced image sharpness due to the spreading of ink colors.
Innovation Solution
The method involves ejecting ink compositions onto a recording medium such that the second ink composition has a higher yield value than the first, resulting in lower fluidity and reduced spreading, thereby preventing color bleeding and enhancing image sharpness. This is achieved by controlling the yield values and fluidity of the ink compositions using the Casson Equation and optimizing the ink jet head arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one color ink is deposited over another color ink in conventional ink jet recording, then multi-color images can be formed, but color bleeding occurs at the boundaries between different colors
Solution Approach 1:
The patent changes the rheological parameters of the ink compositions, specifically setting different yield values for different color inks. The first color ink has a lower yield value (0.01-0.1 Pa) allowing it to spread and form a uniform background, while the second color ink has a higher yield value (0.1-1.0 Pa) preventing it from spreading and maintaining sharp boundaries. This parameter differentiation resolves the contradiction by enabling multi-color formation while preventing color bleeding through controlled fluidity differences.
2Ease of operation
If ink composition has high fluidity for easy deposition, then ink spreads readily on recording medium, but color bleeding occurs between adjacent different colors
Solution Approach 1:
The patent applies local quality by assigning different rheological properties to different ink compositions based on their functional roles. The first color ink (background layer) has high fluidity (low yield value) localized for easy spreading and uniform coverage, while the second color ink (detail layer) has low fluidity (high yield value) localized to prevent spreading and maintain sharp edges. This spatial and functional differentiation of ink properties eliminates color bleeding while ensuring easy deposition of each layer.
Data Source
AI summary
An ink jet recording method includes ejecting at least two color ink compositions onto a recording medium so as to be deposited one on another. When one ink composition is deposited to form a first image and then another ink composition is deposited to form a second image on the first image, the ink composition forming the second image has a higher yield value than the ink composition forming the first image.