Inkjet Head and Ink Composition for Wash-Fast Textile Printing
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Solution Overview
Problem
Ink jet printing methods face challenges in achieving excellent washing fastness of ink-coated films on fabrics without causing nozzle intermittency, especially when using pigment inks, and in ensuring clear color development on non-white fabrics.
Innovation Solution
The method involves using an ink composition with a resin content of 10% to 26% by mass, an organic solvent ratio of 0.3 to 0.7, and a total solid and solvent content of 37% or less, discharged through a printer head with a connection portion distance of 500 μm or more between the pressure chamber and nozzle, which prevents nozzle drying and enhances washing fastness and color development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the content of pigment in white ink is increased to secure image concealment on dark color cloth, then image concealment is improved, but the ink attachment amount on the cloth is increased causing mist contamination and strike through
Solution Approach 1:
The patent controls the pigment content and ink composition parameters to achieve sufficient image concealment on dark color cloth while preventing excessive ink attachment. By limiting the resin content to 10-26% by mass and organic solvent ratio to 0.3 to 0.7, the patent reduces mist generation and strike through while maintaining adequate concealment.
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 excellent washing fastness and color development properties without nozzle intermittency, even with increased resin content for improved adhesion, and provides clear images on both white and non-white fabrics.
Implementation Method 1
a pressure chamber for imparting pressure to the ink composition to cause the nozzle to discharge the ink composition
Implementation Method 2
an ink in a shape of a liquid droplet is discharged from nozzles of a head and attached to the cloth to form an image of an ink coated film on the cloth
Data Source
AI summary
An ink jet printing method includes attaching an ink composition to a cloth by using a printer head which has a nozzle discharging the ink composition, a pressure chamber for imparting pressure to the ink composition to cause the nozzle to discharge the ink composition, and a connection portion connecting the pressure chamber and the nozzle, and in which a distance of the connection portion is 500 μm or more, the distance of the connection portion being from a portion of the pressure chamber where the ink flows out from a pressure chamber to the nozzle side to the nozzle, in which the ink composition includes the resin as a solid content in the amount of 10% by mass to 26% by mass with respect to the ink composition, the ratio of the total content of the organic solvent to the total content of the solid content of the resin is 0.3 or more, and a sum of the total content of the solid content of the resin and the total content of the organic solvent is 37% by mass or less with respect to the ink composition.