Ink Set Fatty Acid Layer Anti-Bleeding on Low-Absorbent Media
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Solution Overview
Problem
Existing ink jet recording methods face issues with color bleeding and poor water and light fastness when using water-soluble dyes on low-absorbent recording media, particularly when combining different inks.
Innovation Solution
An ink set comprising a first ink with a fatty acid and self-dispersing pigment, a second ink with resin-dispersed pigment and no fatty acid, and optionally a third ink with self-dispersing pigment and no fatty acid, is used to prevent bleeding by forming a fatty acid layer on the recording medium, enhancing anti-bleeding effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water-soluble dyes are used in ink jet recording, then the ink can be easily deposited on recording media, but the images show poor water fastness and light fastness
Solution Approach 1:
The patent introduces a binder resin as an intermediary substance that mediates between the water-soluble dye and the recording medium. The binder resin forms a film that anchors the dye particles, preventing them from dissolving or fading, thereby improving water and light fastness while maintaining ease of deposition
Solution Approach 2:
The ink composition is formulated as a composite material system combining water-soluble dyes with binder resins, surfactants, and other additives. This composite approach allows the ink to simultaneously achieve easy deposition (from water solubility) and high fastness (from the binder resin matrix)
2Ease of operation
If a single ink containing water-soluble dye is used for recording on plain paper, then the recording process is simple, but color bleeding occurs and images show poor fastness
Solution Approach 1:
The patent divides the recording system into multiple segmented components: different inks are assigned to different color channels (CMYK), each with optimized compositions. This segmentation allows each ink to be tailored for specific performance characteristics while collectively achieving anti-bleeding effects through their interactions on the recording medium
Solution Approach 2:
The patent modifies key parameters of the ink composition, specifically adjusting the molecular weight, glass transition temperature, and chemical structure of the binder resin. These parameter changes enable the resin to form a effective film that prevents bleeding while maintaining the simplicity of the recording process
3Productivity
If inks are used for recording on low-absorbent recording media, then the recording speed can be maintained, but abnormal bleeding occurs
Solution Approach 1:
The binder resin performs a preliminary action by forming a protective film on the recording medium surface before the dye fully penetrates or dries. This pre-formed film acts as a barrier that prevents abnormal bleeding, allowing the ink to be deposited at high speeds without sacrificing anti-bleeding performance
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 effectively prevents color bleeding and maintains high color developability and glossiness on low-absorbent media, even when used for high-density and high-gloss printing applications.
Implementation Method 1
by selecting inks for an ink set so that each of the inks has a specific relationship between the pigment and the presence or absence of a fatty acid... forming a fatty acid layer on the recording medium, enhancing anti-bleeding effects
Data Source
AI summary
An ink set includes a first ink containing a fatty acid and a self-dispersing pigment, and at least either a second ink containing a resin-dispersed pigment and substantially no fatty acid or a third ink containing a self-dispersing pigment and substantially no fatty acid.