Pretreatment Liquid Inkjet Application for Image Quality
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Solution Overview
Problem
Current ink-jet recording methods consume excessive pretreatment liquids, leading to high costs and image quality deterioration due to increased ink permeability and fiber interactions with recording paper, particularly affecting optical density and feathering.
Innovation Solution
A pretreatment liquid with fine particles and a solvent is applied to a predetermined portion of the recording medium to form a pretreatment layer with a contact angle between 12 degrees and 25 degrees, allowing for reduced consumption while maintaining image quality by optimizing ink penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pretreatment liquid is applied to the entire surface of the recording medium using a roller, then the image quality is improved, but the amount of pretreatment liquid consumed increases and costs increase
Solution Approach 1:
The patent divides the recording medium surface into specific target areas (recording areas) and applies pretreatment liquid only to those areas using an inkjet method, rather than treating the entire surface. This segmentation approach reduces pretreatment liquid consumption while maintaining image quality in the relevant areas.
Solution Approach 2:
The patent applies pretreatment liquid locally to predetermined recording areas rather than uniformly across the entire recording medium. This local quality approach ensures that pretreatment is provided only where needed for image formation, reducing overall liquid consumption while maintaining image quality in the treated areas.
2Speed
If the permeability of the ink is increased to achieve quick-drying, then the printing speed is improved, but the image quality deteriorates due to increased fiber interaction
Solution Approach 1:
The patent applies a pretreatment liquid containing fine particles to the recording medium before ink dispensing. This preliminary action modifies the surface properties of the recording medium, creating a layer that controls ink penetration and reduces fiber interaction, thereby preventing image quality deterioration even when using high-permeability quick-drying inks.
Solution Approach 2:
The pretreatment liquid containing fine particles acts as an intermediary layer between the ink and the recording medium fibers. This intermediary layer controls the interaction between ink and fibers, preventing excessive penetration and feathering while allowing the ink to dry quickly, thus maintaining both printing speed and image quality.
3Manufacturing precision
If a pretreatment liquid containing surfactant is used to improve printing quality, then the image quality is improved, but the cost increases
Solution Approach 1:
The patent uses an inkjet method to apply pretreatment liquid only to specific recording areas rather than the entire surface, reducing the total amount of expensive pretreatment liquid needed while maintaining printing quality in the relevant areas.
Solution Approach 2:
The patent modifies the composition of the pretreatment liquid by incorporating fine particles with specific properties (hydrophobicity, surface energy) to achieve effective pretreatment at lower concentrations and reduced application areas, thereby reducing overall cost while maintaining or improving printing quality.
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
This approach reduces pretreatment liquid consumption, lowers costs, and preserves image quality by controlling ink penetration and preventing ink bleed or color unevenness, thereby enhancing optical density and chroma.
Implementation Method 1
a contact angle between a surface of the pretreatment layer and the at least one ink is between about 12 degrees and about 25 degrees
Implementation Method 2
the pretreatment liquid comprises fine particles and a solvent
Data Source
AI summary
A pretreatment liquid for ink-jet recording by applying the pretreatment liquid to a predetermined portion of a recording medium to form a pretreatment layer on the pretreatment portion in advance of dispensing at least one ink onto the pretreatment layer by an inkjet method, the pretreatment liquid includes fine particles and a solvent. Specifically, a contact angle between a surface of the pretreatment layer and the at least one ink is between about 12 degrees and about 25 degrees.