Ink jet printing method and ink jet printing apparatus
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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, particularly when using pigment inks, and in ensuring clear image development with non-white inks.
Innovation Solution
The method involves using an ink jet printing apparatus with a printer head that includes a nozzle discharging ink composition, a pressure chamber, and a connection portion with a distance of 500 μm or more between the pressure chamber and nozzle, along with an ink composition containing 10% to 26% resin by mass and an appropriate organic solvent ratio, to prevent ink drying on the nozzle surface and enhance washing fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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 content of resin must be increased corresponding to pigment increase, which increases ink attachment amount and causes mist contamination or strike through
Solution Approach 1:
The patent changes the concentration parameters of the ink composition by increasing pigment content (5-30 mass%) while simultaneously optimizing resin content (5-20 mass%) and solvent composition. This balanced parameter adjustment allows high pigment content for image concealment while controlling total solid content to prevent excessive ink attachment, mist generation, and strike through on the fabric.
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 allows for ink jet printed matter with improved washing fastness and color developing properties without impairing intermittency, even with increased resin content for white inks, and ensures clear image development on 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
the ink may become dried from a nozzle surface and a problem of intermittency occurs
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.