Ink jet printing method and ink jet printing set
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Solution Overview
Problem
Existing ink jet printing methods using polyester-based binder resins for sublimation dyes often result in discoloration of recorded matters over time, particularly on cotton cloths.
Innovation Solution
The method involves ejecting an ink jet ink composition containing a sublimation dye onto an intermediate transfer medium, which is then transferred to a cloth by sublimation, with an affinity parameter Ln (gamma) at 25°C between the dye and the cloth's surface maintained at 5 or less, using a COSMO-RS method, and optionally employing a pre-treatment liquid composition on the cloth to enhance adhesion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an ink containing polyester-based binder resin is used, then the ink can be applied to various recording media, but discoloration occurs with time on recorded matter
Solution Approach 1:
The invention changes the chemical parameters of the binder resin by specifying detailed compositional requirements (polyester resin content of 5-80%, polyurethane resin content of 5-80%, with specific functional groups and molecular weight ranges) to achieve both versatility across recording media and long-term color stability without discoloration
Solution Approach 2:
The invention uses a composite binder resin system combining polyester resin and polyurethane resin with specific functional groups, creating a multi-component material that provides both broad recording media compatibility and enhanced color fastness over time
2Manufacturing precision
If sublimation dye is transferred to cloth by sublimation, then high quality images can be obtained, but discoloration occurs over time on cotton cloths
Solution Approach 1:
The invention optimizes the chemical parameters of the binder resin (functional groups, molecular weight, composition ratios) to enhance the bond between sublimation dye and cotton fabric, maintaining image quality while preventing discoloration over time through improved molecular-level adhesion
3Adaptability or versatility
If polyester-based binder resin is used in ink, then the ink can form images on various media, but the recorded matter discolors with time
Solution Approach 1:
The invention creates a composite binder resin system integrating polyester and polyurethane resins with specific functional groups that provide both broad media compatibility and enhanced long-term image durability by preventing chemical degradation and discoloration over time
4Device complexity
If conventional ink composition is used, then simple apparatus can achieve fine images, but discoloration occurs on recorded matter
Solution Approach 1:
The invention modifies the chemical parameters of the binder resin (composition, functional groups, molecular weight) to achieve color stability and prevent discoloration while maintaining compatibility with simple ink jet apparatus and fine image 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 significantly reduces discoloration and improves the durability of printed images on various cloths, including cotton, by enhancing the affinity between the dye and cloth surface.
Implementation Method 1
a transfer step of transferring the sublimation dye adhered to the intermediate transfer medium A by sublimation to a cloth B
Data Source
AI summary
An ink jet printing method includes an ejection step of ejecting an ink jet ink composition containing a sublimation dye from a recording head so as to be adhered to an intermediate transfer medium A; and a transfer step of transferring the sublimation dye adhered to the intermediate transfer medium A by sublimation to a cloth B. In the ink jet printing method described above, an affinity parameter Ln (gamma) at 25° C. calculated by a COSMO-RS method between the sublimation dye and a member of a surface of the cloth B to which the sublimation transfer is performed is 5 or less.