Ink Jet Recording Method for Textile Printing
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Solution Overview
Problem
Ink jet textile printing methods often require separate apparatuses for pretreatment and coating liquids, leading to potential deterioration in color developability and fastness of images, especially when attempting to continuously apply these liquids in the same apparatus.
Innovation Solution
An ink jet recording method involving a sequence of steps: discharging an ink composition containing self-dispersing pigments, followed by a reaction liquid composition with an aggregating agent, and then another ink composition, all performed in quick succession to enhance color developability and fastness, with time differences between these steps controlled within 45 milliseconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate apparatuses are used for pretreatment liquid and coating liquid, then the application process is simple and reliable, but the equipment complexity increases and the process becomes complicated
Solution Approach 1:
The patent combines the pretreatment liquid application and coating liquid application into a single ink jet apparatus, eliminating the need for separate apparatuses. The ink jet head can discharge both pretreatment liquid and coating liquid through controlled ejection, reducing equipment complexity while maintaining reliable color developability through precise timing control of the two liquid applications
2Device complexity
If pretreatment liquid and coating liquid are applied continuously in the same apparatus, then equipment complexity is reduced, but color developability may be deteriorated
Solution Approach 1:
The patent applies the pretreatment liquid to the fabric first as a preliminary action, allowing it to be absorbed and prepared for subsequent coating. The ink jet control system then precisely times the coating liquid ejection to occur after the pretreatment liquid has been applied, ensuring proper sequence and maintaining color developability while using a single apparatus for both operations
3Reliability
If time difference between ink composition attachment and reaction liquid composition attachment is large, then the mixing and reaction on fabric surface is insufficient, but if the time difference is small, then the self-dispersing pigment reactivity may be compromised
Solution Approach 1:
The patent optimizes the time difference parameter between ink composition attachment and reaction liquid composition attachment to within 45 milliseconds. This precise parameter control ensures that the self-dispersing pigment reacts effectively with the aggregating agent in the reaction liquid while maintaining proper reactivity and color developability, achieving the optimal balance between mixing time and chemical reaction efficiency
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 method improves color developability and fastness of images by ensuring the ink and reaction liquids are effectively mixed and reacted on the fabric surface, maintaining the self-dispersing pigment's reactivity and stability, thereby enhancing image quality.
Implementation Method 1
a reaction liquid attachment step of discharging a reaction liquid composition containing an aggregating agent that aggregates components of the ink composition
Data Source
AI summary
An ink jet recording method including a first ink attachment step of discharging an ink composition containing a self-dispersing pigment by an ink jet method to attach the ink composition to a fabric, a reaction liquid attachment step of discharging a reaction liquid composition containing an aggregating agent that aggregates components of the ink composition by an ink jet method to attach the reaction liquid composition to the fabric, and a second ink attachment step of discharging an ink composition containing a self-dispersing pigment by an ink jet method to attach the ink composition to the fabric, in which the first ink attachment step, the reaction liquid attachment step, and the second ink attachment step are continuously performed in this order, a time difference from when the ink composition is attached by the first ink attachment step to when the reaction liquid composition is attached to a region to which the ink composition is attached by the reaction liquid attachment step is within 45 milliseconds, and a time difference from when the reaction liquid composition is attached by the reaction liquid attachment step to when the ink composition is attached to a region to which the reaction liquid composition is attached by the second ink attachment step is within 45 milliseconds.