Inkjet printing on dyed synthetic fabrics
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Solution Overview
Problem
Inkjet printing on polyester fabrics is limited by dye migration, where the dye entangles with the ink at elevated temperatures, causing discoloration and image degradation, especially with aqueous-based inks that are typically basic, displacing cationic dyes and leading to dye migration issues.
Innovation Solution
Applying an acidic wetting composition to a polyester fabric with negatively charged functional groups, followed by inkjet printing with a basic colored ink composition, which immobilizes the ink droplets upon curing, preventing dye migration by maintaining the dye's position within the fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aqueous-based basic inkjet inks are used for printing on polyester fabric, then the ink can be applied and cured, but dye migration occurs causing discoloration and image degradation
Solution Approach 1:
An acidic composition is applied to the polyester fabric before inkjet printing to pre-condition the substrate. This preliminary acidic treatment creates a controlled environment that prevents basic ink components from displacing cationic dyes during subsequent printing and curing, thereby preventing dye migration while allowing the inkjet printing process to proceed
Solution Approach 2:
The acidic composition acts as an intermediary layer between the basic inkjet ink and the cationic dye in the polyester fabric. This intermediary acidic treatment modifies the substrate surface to create a protective environment that prevents direct interaction between the basic ink and the dye, eliminating the displacement reaction that causes dye migration
2Manufacturing precision
If the fabric is heated to cure the ink, then the ink sets properly, but the elevated temperature causes dye entanglement to reverse and dye to migrate
Solution Approach 1:
The acidic composition is applied beforehand to counteract the harmful effect of heat-induced dye migration. This preliminary acidic treatment creates a protective environment that prevents the reversal of dye entanglement during heating, allowing the fabric to be cured at elevated temperatures without experiencing dye migration or discoloration
3Adaptability or versatility
If basic species in the ink are used to achieve proper ink formulation, then the ink performs well, but the basic species displace cationic dye leading to dye migration
Solution Approach 1:
The acidic composition serves as an intermediary that modifies the substrate surface before ink application. This intermediary acidic layer prevents direct contact between the basic ink species and the cationic dye, eliminating the displacement reaction while allowing the basic ink formulation to maintain its performance characteristics
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 effectively prevents dye migration during the curing process, ensuring high-resolution, stretchable images on polyester fabrics without color loss or image distortion, as demonstrated by reduced dye migration assessed through Lab* analysis.
Implementation Method 1
Applying an acidic wetting composition to a polyester fabric with negatively charged functional groups, followed by inkjet printing with a basic colored ink composition, which immobilizes the ink droplets upon curing
Implementation Method 2
curing the image
Data Source
AI summary
A process and a kit for inkjet printing high resolution color and stretchable images on dyed synthetic substrates are provided.