Ink Jet Recording Method Coagulating Agent Barrier
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Solution Overview
Problem
Ink jet recording methods fail to achieve high-speed printing with high-quality images on plain paper due to issues with drying time, fixation, optical density, bleeding, and intercolor bleeding, especially when double-sided printing is involved, as the existing technologies do not adequately balance coagulation and permeability, leading to dirty images and poor image quality.
Innovation Solution
An ink jet recording method that uses an ink set comprising a first liquid with a colorant, water, and a water-soluble solvent, and a second liquid with a coagulating agent, water, and a water-soluble solvent, where the application amounts per unit area in both double-sided and single-sided printing modes satisfy the relationship 0.01 < RD2 × RM1 / (RD1 × RM2) < 1, ensuring improved optical density, bleeding, and intercolor bleeding properties while maintaining satisfactory drying times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed printing is pursued with double-sided printing mode, then productivity is improved, but image quality deteriorates due to colorant sticking to paper conveying structural elements and re-transfer to image area causing dirty images
Solution Approach 1:
The patent applies preliminary action by introducing a treatment liquid containing a coagulating agent before the colorant is fully fixed. This coagulating agent precipitates before the colorant, forming a barrier that prevents colorant from sticking to paper conveying structural elements during high-speed double-sided printing, thus preventing dirty images while maintaining productivity
Solution Approach 2:
The treatment liquid acts as an intermediary substance between the colorant and the paper conveying structural elements. It contains a coagulating agent that forms a precipitate barrier, mediating the interaction to prevent direct contact between colorant and conveying elements, thereby preventing colorant transfer to the image area during high-speed printing
2Manufacturing precision
If coagulation is enhanced to improve optical density and reduce bleeding, then image quality is improved, but drying time increases causing colorant to stick to conveying elements
Solution Approach 1:
The coagulating agent is applied preliminarily before the colorant is fully deposited and dried. This preliminary coagulation forms a barrier that prevents colorant from migrating to conveying elements during the subsequent drying process, allowing enhanced coagulation for improved optical density without excessive drying time
Solution Approach 2:
The treatment liquid with coagulating agent serves as an intermediary that facilitates controlled coagulation. It provides a mechanism for coagulation to occur at the right time and place, improving optical density while the coagulated precipitate acts as a barrier preventing colorant sticking to conveying elements
3Manufacturing precision
If treatment liquid is applied to improve coagulation and fixation, then image quality is improved, but the complexity of the recording process increases
Solution Approach 1:
The treatment liquid application is merged with the colorant ejection process. The recording head can eject both the colorant and the treatment liquid in an integrated manner, or the treatment liquid is applied through the same nozzle system, combining multiple functions into a single process to avoid adding significant complexity
Solution Approach 2:
The recording system is designed with multi-functionality where the same recording apparatus can handle both colorant ejection and treatment liquid application. The system can operate in different modes (single-sided, double-sided, treatment liquid print mode) using the same hardware, avoiding the need for separate dedicated equipment and reducing overall system complexity
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 method achieves improved image quality with reduced dirty images, faster drying times, and enhanced optical density and bleeding performance, effectively addressing the limitations of existing technologies by optimizing the interaction between coagulation and permeability in both double-sided and single-sided printing modes.
Implementation Method 1
a second liquid includes at least a coagulating agent, a water soluble solvent and water
Implementation Method 2
a water soluble solvent
Data Source
AI summary
The invention provides an ink jet recording method which includes ejecting an ink set. The ink set includes a first liquid which includes a colorant, a water soluble solvent and water, and a second liquid which includes a coagulating agent, a water soluble solvent and water. Recording in a double sided print mode and recording in a single sided print mode are possible. The following Expression (1) is satisfied.0.01<RD2×RM1RD1×RM2<1Expression(1)In Expression (1), RD1 is an application amount per unit area of the first liquid in double sided printing mode. RD2 is an application amount per unit area of the second liquid in double sided printing mode. RM1 is an application amount per unit area of the first liquid in single sided printing mode. RM2 is an application amount per unit area of the second liquid in single sided printing mode.