Textile Printing Ink Composition for Rubbing Fastness and Texture
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Solution Overview
Problem
Conventional textile printing methods, such as screen and roller printing, are not suitable for high-mix low-volume manufacturing and result in significant wastewater discharge, while existing inkjet textile printing inks may not provide sufficient fastness to rubbing and texture improvements.
Innovation Solution
A textile printing ink composition comprising a combination of two resins with specific elongation and tensile strength properties, along with a pigment and aqueous medium, to enhance the ink's adhesion and flexibility, thereby improving fastness to rubbing and fabric texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional screen or roller printing methods are used, then printing quality can be achieved, but the methods are not suitable for high-mix low-volume manufacturing and cause significant wastewater discharge
Solution Approach 1:
The patent replaces conventional screen printing and roller printing mechanical systems with inkjet printing technology. This substitution eliminates the need for physical screens and rollers, enabling digital printing that is suitable for high-mix low-volume manufacturing while significantly reducing wastewater discharge through contactless printing and elimination of rinsing processes
Solution Approach 2:
The patent changes the fundamental printing parameters by transitioning from paste-based conventional printing to inkjet-based printing with controlled ink composition. This includes modifying ink viscosity, particle size distribution, and chemical composition to achieve proper inkjet ejection and fabric penetration without requiring extensive rinsing, thereby reducing wastewater
2Ease of operation
If existing inkjet textile printing inks are used, then the printing process is simplified, but the fastness to rubbing and fabric texture are insufficient
Solution Approach 1:
The patent employs a composite ink formulation containing multiple resin types (polyester resin and polyurethane resin), pigments, and auxiliary agents in specific proportions. This composite material approach provides both the ease of inkjet printing operation and the required fastness to rubbing, while the resin-pigment-aqueous medium composite structure also improves fabric texture
Solution Approach 2:
The patent optimizes critical ink parameters including resin content (6-15 mass%), pigment particle size (0.1-2.0 μm), viscosity (10-100 cP), and pH (5.0-9.0) to achieve the balance between printability and fastness. These parameter adjustments ensure proper inkjet ejection while forming a durable, flexible film on the fabric that resists rubbing and maintains texture
3Stability of the object's composition
If resin particles with high elongation are used, then fabric flexibility is improved, but tensile strength may be insufficient
Solution Approach 1:
The patent uses a composite resin system combining polyester resin (providing flexibility with 500-750% elongation) and polyurethane resin (providing tensile strength with 55-90 MPa). This composite approach allows the ink film to simultaneously exhibit the flexibility needed for fabric movement and the strength required for durability, resolving the contradiction between elongation and tensile strength
Data Source
AI summary
An aspect of the present disclosure relates to an ink composition for textile printing containing: a resin; a pigment; an aqueous medium; and an organic solvent, wherein the resin includes: a first resin having an elongation of 500% or more and 750% or less and a tensile strength of 25 MPa or more and 40 MPa or less; and a second resin having an elongation of 250% or more and 550% or less and a tensile strength of 55 MPa or more and 90 MPa or less.