Printing method, printing device, printed matter, and set of processing fluid and ink
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Solution Overview
Problem
Existing printing methods for direct printing on fabrics face challenges in achieving excellent laundry fastness and flexibility while preventing fabric twisting, especially when using dark color fabrics.
Innovation Solution
A printing method involving the application of a processing fluid containing a flocculant, humectant, and surfactant to the fabric, followed by the application of an ink that includes a pigment, a resin with cross-linkable functional groups, a pH regulator, and compounds like block isocyanate, carbodiimide, or polymers with oxazoline groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If white ink and color ink are printed in sequence with white ink applied first, then excellent coloring and fastness are achieved, but fabric twisting occurs and flexibility deteriorates
Solution Approach 1:
A processing fluid containing a flocculant is applied to the fabric before ink printing. This preliminary action modifies the fabric surface to improve ink adhesion and reduce the need for excessive white ink, thereby preventing fabric twisting while maintaining excellent laundry fastness and flexibility.
2Reliability
If more white ink is applied to dark color fabric, then excellent coloring and fastness are achieved, but fabric twisting occurs and flexibility deteriorates
Solution Approach 1:
The processing fluid with flocculant is applied beforehand to dark color fabrics to prepare the surface for optimal ink adhesion. This reduces the quantity of white ink needed to achieve excellent coloring and fastness, thereby preventing the harmful effect of fabric twisting.
Solution Approach 2:
The invention changes the chemical parameters of the fabric surface by applying a processing fluid containing a flocculant. This modification improves ink adhesion and allows for reduced ink application, preventing fabric twisting while maintaining excellent laundry fastness on dark color fabrics.
3Illumination intensity
If pigment ink is used for direct printing, then light resistance is improved, but ink adhesion and laundry fastness deteriorate
Solution Approach 1:
A processing fluid containing a flocculant acts as an intermediary between the pigment ink and the fabric. This intermediary substance improves ink adhesion to the fabric surface, enabling pigment ink to achieve both excellent light resistance and laundry fastness through enhanced bonding.
Solution Approach 2:
The processing fluid is applied to the fabric before pigment ink printing to prepare the surface for optimal adhesion. This preliminary treatment ensures that pigment ink achieves excellent both light resistance and laundry fastness by improving the bonding between ink and fabric.
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 produces printed matter with enhanced laundry fastness and flexibility, while minimizing fabric twisting, by ensuring proper ink adhesion and cross-linking on the fabric surface.
Implementation Method 1
a resin having a cross-linkable functional group
Implementation Method 2
at least one member selected from the group consisting of a block isocyanate compound, a carbodiimide compound, and a polymer having an oxazoline group
Implementation Method 3
a processing fluid containing a flocculant
Implementation Method 4
a processing fluid containing a flocculant, humectant, and surfactant
Data Source
AI summary
A printing method contains applying a processing fluid to a fabric and applying an ink to the fabric to which the processing fluid has been applied, wherein the ink contains a pigment, a resin having a cross-linkable functional group, a pH regulator, and at least one member selected from a block isocyanate compound, a carbodiimide compound, and a polymer having an oxazoline group.