Textile Pigment Ink Coating for Friction Fastness and Soft Texture
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Solution Overview
Problem
Inkjet textile printing methods using pigment inks face challenges in achieving sufficient friction fastness without impairing the fabric's texture, as excessive resin aggregation can lead to poor wet-spreading and surface coverage of the ink layer.
Innovation Solution
An image forming method involving a fabric pretreated with an aggregating agent, where an aqueous ink containing a pigment and a first resin is applied, followed by a coating liquid with a second resin, with the second resin's content being lower than the first resin in the ink and the coating liquid's amount being greater than the ink's, to enhance friction fastness while maintaining fabric texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of the second resin in the coating liquid is increased to improve friction fastness, then friction fastness is improved, but the fabric becomes hard and its texture is impaired
Solution Approach 1:
The patent changes the parameter of resin content ratio between ink and coating liquid. Specifically, the content of the second resin in the coating liquid is set to be smaller than the content of the first resin in the ink (Content ratio: First resin/Second resin > 1). This parameter change prevents excessive resin aggregation while ensuring sufficient friction fastness through the synergistic effect of both resins, thereby maintaining fabric texture.
2Manufacturing precision
If a pretreatment of attaching an aggregating agent to the fabric is performed to thicken the ink and prevent permeation, then color developability is enhanced and fabric texture is protected, but the resin particles in the coating liquid are excessively aggregated and wet-spreading is impaired
Solution Approach 1:
The patent optimizes the parameter of resin content ratio to control aggregation. By setting the content of the second resin in the coating liquid to be smaller than the content of the first resin in the ink, the patent achieves sufficient aggregation for color developability while preventing excessive aggregation that would impair wet-spreading. The synergistic interaction between the two resins maintains proper flow properties.
3Stability of the object's composition
If the content of the first resin in the ink is decreased to improve ejection stability, then ejection stability is enhanced, but fixability becomes insufficient
Solution Approach 1:
The patent combines the functions of two different resins (first resin in ink, second resin in coating liquid) to achieve both ejection stability and fixability. The first resin provides ejection stability when its content is optimized, while the second resin applied in the coating liquid step ensures sufficient fixability. The synergistic effect of both resins resolves the contradiction between ejection stability and fixability.
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 ensures sufficient friction fastness without hardening the fabric, as the reduced second resin content in the coating liquid prevents excessive thickening and allows for uniform coverage, while the increased amount of coating liquid ensures thorough surface coverage.
Implementation Method 1
the second resin is aggregated by the aggregating agent
Implementation Method 2
a coating liquid containing a second resin and water is attached onto the applied aqueous ink
Data Source
Figure 1A~1B
AI summary
To provide an image forming method capable of forming an image having favorable friction fastness without impairing a texture of a fabric (130). An image forming method according to an embodiment of the present invention includes: a step of preparing a fabric (130) to which an aggregating agent is attached; a step of applying an aqueous ink containing a pigment, a first resin, and water onto the fabric (130) to which the aggregating agent is attached; and a step of applying a coating liquid containing a second resin and water onto the applied aqueous ink. The second resin is aggregated by the aggregating agent, the content of the second resin in the coating liquid is smaller than the content of the first resin in the aqueous ink, and the amount of the coating liquid attached to the fabric (130) is larger than the amount of the aqueous ink attached to the fabric (130).