Ink Formulation for Non-Permeable Vinyl Chloride Substrates
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Solution Overview
Problem
Inkjet printing on non-permeable substrates like vinyl chloride resin films faces issues with image quality due to insufficient drying, leading to uneven images and beading, as existing inks struggle to balance high performance with high image quality.
Innovation Solution
An ink formulation containing water, an organic solvent with a contact angle of 20 degrees or less against vinyl chloride resin, and a resin with a glass transition temperature between 0 to 70 degrees C., ensuring a contact angle relationship that prevents excessive coalescence and enhances fixability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional inks are used for printing on non-permeable substrates like vinyl chloride resin films, then printing speed and performance can be maintained, but image quality deteriorates due to insufficient drying, leading to uneven images and beading
Solution Approach 1:
The patent modifies the chemical composition parameters of the ink by incorporating specific organic solvents with controlled contact angles (20 degrees or less against vinyl chloride resin) and resins with specific glass transition temperatures (0 to 70 degrees C.). This parameter optimization enables the ink to achieve both rapid drying on non-permeable substrates and high image quality, resolving the contradiction between printing speed and image quality
Solution Approach 2:
The patent creates a composite ink formulation combining water, specifically selected organic solvents (such as esters, ketones, or carbonates with appropriate contact angles), and resins with controlled glass transition temperatures. This composite material approach allows the ink to exhibit both rapid drying characteristics and excellent image quality on vinyl chloride resin films, simultaneously achieving high productivity and manufacturing precision
2Productivity
If ink formulation is optimized for rapid drying on non-permeable substrates, then productivity improves, but image quality and uniformity worsen due to beading and uneven distribution
Solution Approach 1:
The patent precisely controls the contact angle parameter of organic solvents (20 degrees or less against vinyl chloride resin) and the glass transition temperature parameter of resins (0 to 70 degrees C.). These parameter optimizations enable the ink to spread uniformly across non-permeable substrates while maintaining rapid drying speed, thus improving both productivity and image uniformity without causing beading
Solution Approach 2:
The patent tailors the ink's wetting and drying properties specifically for vinyl chloride resin substrates by selecting organic solvents with contact angles of 20 degrees or less against this specific material. This localized optimization ensures the ink achieves rapid drying and uniform distribution on the target substrate without compromising image quality, resolving the contradiction between drying speed and uniformity
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 achieves improved drying properties, fixability, and image quality on non-permeable substrates, with enhanced abrasion resistance and glossiness, suitable for high-performance printing.
Implementation Method 1
an organic solvent having a contact angle θ3 of the organic solvent of 20 degrees or less against the vinyl chloride resin film
Implementation Method 2
a resin having a glass transition temperature Tg of from 0 to 70 degrees C.
Implementation Method 3
the contact angle θ1 of the ink against a vinyl chloride resin film and the contact angle θ2 of the ink against an ink image formed with the ink satisfies the following relationship: θ1
Data Source
AI summary
An ink contains water, an organic solvent, and a resin having a glass transition temperature Tg of from 0 to 70 degrees C., wherein a contact angle θ1 of the ink against a vinyl chloride resin film and a contact angle θ2 of the ink against an ink image formed with the ink satisfies the following relationship: θ1<θ2.