Ink set, fluid applying apparatus, fluid applying method, and printed product
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Solution Overview
Problem
Pigment inks used in inkjet printing face challenges with lower color development and image peeling/flaking on substrates like polyester, requiring improved image density and rubbing fastness.
Innovation Solution
An ink set comprising a pre-treatment fluid with an organic acid and amine compound, an aqueous pigment ink, and a post-treatment fluid with cationic resin particles, applied in a specific sequence to enhance pigment aggregation and layer formation for improved image density and fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pigment inks are used instead of dye inks, then environmental burden is reduced and substrate compatibility is improved, but image density and color development deteriorate
Solution Approach 1:
A pre-treatment fluid containing an organic acid and an amine compound is applied to the substrate before applying the pigment ink. This preliminary treatment modifies the substrate surface to improve pigment aggregation and adhesion, thereby enhancing image density while maintaining the environmental benefits of pigment inks.
Solution Approach 2:
The invention uses a composite approach by combining multiple components: pre-treatment fluid (organic acid + amine compound), pigment ink, and post-treatment fluid (cationic resin particles). This composite system works synergistically to achieve both high image density and environmental friendliness, as the pre and post treatments compensate for the inherent limitations of pigment inks.
2Device complexity
If pigment inks are used instead of dye inks, then post-treatment complexity is reduced, but rubbing fastness deteriorates due to image peeling and flaking
Solution Approach 1:
The pre-treatment fluid containing organic acid and amine compound is applied before the pigment ink to prepare the substrate surface. This preliminary action enhances pigment adhesion and prevents peeling, thereby improving rubbing fastness without adding complex post-treatment steps.
Solution Approach 2:
The invention changes the chemical parameters of the substrate surface through the pre-treatment fluid (organic acid and amine compound), which modifies surface properties to improve pigment bonding. This parameter change enhances rubbing fastness while keeping the overall process simple.
3Adaptability or versatility
If pigment inks are used on polyester substrates, then substrate versatility is improved, but image density and color development deteriorate
Solution Approach 1:
The pre-treatment fluid containing organic acid and amine compound is applied to polyester substrates before pigment ink application. This preliminary treatment specifically addresses the low image density issue on polyester by modifying the substrate surface to enhance pigment aggregation and adhesion, thereby achieving good image density across diverse substrates including polyester.
Solution Approach 2:
The pre-treatment fluid and post-treatment fluid system is designed to be universally applicable to various substrates including cotton, polyester, and blended fabrics. The same treatment system achieves improved image density across different substrate types, demonstrating multi-functionality and broad substrate compatibility.
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 ink set achieves good image density and high rubbing fastness on a variety of substrates, including polyester, by forming distinct layers that enhance reflectance and protect the print layer.
Implementation Method 1
enhance pigment aggregation and layer formation for improved image density and fastness
Implementation Method 2
forming distinct layers that enhance reflectance and protect the print layer
Implementation Method 3
forming distinct layers that enhance reflectance and protect the print layer
Data Source
AI summary
An ink set contains: a pre-treatment fluid containing an organic acid and an amine compound; an aqueous pigment ink containing water; a pigment; and an organic solvent, and a post-treatment fluid containing a cationic resin particle.