Water-Based Ink Composition for Low-Absorbency Substrate Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin sheets and non-woven fabrics with ink non-absorbency or low ink-absorbency pose challenges for ink adhesion and scratch resistance in image forming methods, as existing techniques fail to provide sufficient adhesion and durability on these substrates.
Innovation Solution
A water-based ink containing polymer particles, an amine compound with a hydroxyl group, and a colorant is applied using an ink jet method, with specific formulations and additives to enhance adhesion and scratch resistance on substrates with ink non-absorbency or low ink-absorbency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin sheet or non-woven fabric with ink non-absorbency or low ink-absorbency is used as a recording substrate, then the substrate maintains its structural integrity and surface properties, but the ink adhesion deteriorates and image scratch resistance becomes low
Solution Approach 1:
The patent introduces a specific binder resin as an intermediary substance between the ink and the resin sheet or non-woven fabric substrate. This binder resin contains functional groups that can chemically or physically bond to both the ink components and the substrate surface, thereby mediating the adhesion interface and solving the problem of poor ink adhesion on low-absorbency substrates while maintaining scratch resistance
Solution Approach 2:
The patent modifies the chemical and physical parameters of the ink formulation by adjusting the binder resin content, molecular weight, and functional group composition. These parameter changes enable the ink to achieve optimal adhesion to the resin sheet or non-woven fabric substrate without compromising the substrate's inherent properties or the image's scratch resistance
2Reliability
If surface treatment such as corona treatment is performed on the substrate, then ink adhesion is improved, but the surface quality deteriorates and the surface becomes roughened considerably
Solution Approach 1:
The patent replaces the mechanical/physical surface treatment method (corona treatment) with a chemical approach by incorporating a specifically designed binder resin in the ink formulation. This substitution achieves improved ink adhesion through chemical bonding mechanisms without the mechanical surface roughening caused by corona treatment, thereby maintaining surface quality
Solution Approach 2:
The binder resin acts as a chemical intermediary that facilitates adhesion between the ink and the untreated substrate surface. This intermediary approach achieves effective ink bonding without requiring aggressive surface treatment, thus preserving the substrate's surface quality and smoothness
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 significantly improves adhesion and scratch resistance of images on resin sheets and non-woven fabrics, ensuring superior durability and image quality on substrates with low ink absorbency.
Implementation Method 1
a method of discharging ink droplets from multiple nozzles, which are provided in an ink jet head, to form an image
Implementation Method 2
A water-based ink containing polymer particles, an amine compound with a hydroxyl group, and a colorant is applied using an ink jet method, with specific formulations and additives to enhance adhesion and scratch resistance
Implementation Method 3
A water-based ink containing polymer particles, an amine compound with a hydroxyl group, and a colorant is applied using an ink jet method, with specific formulations and additives to enhance adhesion and scratch resistance
Data Source
Figure 1
Figure 2
AI summary
Provided is an image forming method capable of obtaining an image which has superior adhesion with a recording substrate having ink non-absorbency or low ink-absorbency and has superior scratch resistance. The ink forming method includes an ink application step of applying a water-based ink containing polymer particles, an amine compound having at least one hydroxyl group, a colorant, and water, onto a recording substrate having ink non-absorbency or low ink-absorbency.