Image forming method and ink set
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Solution Overview
Problem
Existing inkjet textile printing methods using pigment inks face challenges in maintaining friction fastness over time due to issues with interface formation and peeling of post-treatment layers, as well as permeation of resin particles into fabrics, which impair texture.
Innovation Solution
Applying a post-treatment liquid in a wet-on-wet manner with a specific solubility parameter difference (ΔSP) between resin particles and lubricant, ensuring 0.3≤SP1−SP2≤0.8, to enhance affinity and control lubricant diffusion, thereby maintaining friction fastness and fabric texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a post-treatment liquid is applied onto dried ink in a wet-on-dry manner, then the ink layer is formed first, but an interface is easily formed between the ink layer and post-treatment layer causing the post-treatment layer to peel off by friction
Solution Approach 1:
The patent applies the post-treatment liquid onto the ink while the ink is still wet, before complete drying occurs. This preliminary action prevents interface formation by allowing the lubricant to penetrate into the ink layer and resin particles while they are still in a receptive state, creating a unified structure that resists friction-induced peeling.
Solution Approach 2:
The lubricant in the post-treatment liquid acts as an intermediary that penetrates into the ink layer and binds with resin particles. This intermediary substance fills the interface between ink and post-treatment layer, preventing direct contact and potential peeling, while also providing long-term friction resistance.
2Illumination intensity
If resin particles are applied to fabric, then color developability is improved, but resin particles easily permeate the fabric impairing texture
Solution Approach 1:
The patent applies a cationic substance to the fabric before inkjet application, creating a preliminary charged surface that attracts and retains resin particles on the fabric surface. This preliminary action prevents resin particles from permeating into the fabric interior, maintaining texture while enabling sufficient color developability.
Solution Approach 2:
The patent creates different functional zones: the fabric surface is treated with cationic substance to attract and hold resin particles, while the fabric interior remains untreated. This local differentiation ensures resin particles stay on the surface for color development without permeating deep into the fabric structure, preserving texture.
3Reliability
If lubricant is applied to enhance friction fastness, then friction resistance is improved, but lubricant easily diffuses to fabric surface in short time causing premature loss
Solution Approach 1:
The resin particles act as an intermediary carrier for the lubricant. The lubricant penetrates into and binds with the resin particles, which then serve as a reservoir that releases lubricant gradually. This intermediary mechanism prevents rapid diffusion to the fabric surface while ensuring long-term friction fastness.
Solution Approach 2:
The patent controls the solubility parameter difference between the lubricant and resin particles (0.3≤SP1−SP2≤0.8), optimizing the affinity and penetration rate. This parameter optimization ensures the lubricant penetrates sufficiently into the resin particles for long-term retention, while preventing excessive diffusion to the fabric surface that would cause premature loss.
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 achieves long-lasting friction fastness by preventing interface formation and reducing resin particle permeation, ensuring the fabric's texture is maintained without premature lubricant loss.
Implementation Method 1
when a solubility parameter of a resin constituting the resin particles is represented by SP1 (cal/cm3)1/2 and a solubility parameter of the lubricant is represented by SP2 (cal/cm3)1/2, 0.3≤SP1−SP2≤0.8 is satisfied
Data Source
AI summary
An image forming method includes: applying an ink containing a pigment and resin particles onto a fabric by an inkjet method; and applying a post-treatment liquid containing a lubricant onto the ink applied to the fabric in a wet-on-wet manner, wherein when a solubility parameter of a resin constituting the resin particles is represented by SP1 (cal/cm3)1/2 and a solubility parameter of the lubricant is represented by SP2 (cal/cm3)1/2, 0.3≤SP1−SP2≤0.8 is satisfied.