White Pigment Inkjet Recording for Low Nozzle Adhesion
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Solution Overview
Problem
Existing image recording methods face challenges in maintaining continuous jettability and covering property of ink, particularly when using larger liquid droplet amounts, leading to ink overflow and adhesion on the jetting surface, which causes jetting failures.
Innovation Solution
An image recording method involving an ink composition with a white pigment, specifically titanium dioxide particles, and a polymer dispersant, ensuring a liquid droplet amount of 1.0 pL or greater with an ink adhesion rate of 40% or less after a dripping property test, improving both continuous jettability and covering property.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid droplet amount is increased to improve covering property, then the covering property is improved, but ink adhesion on the jetting surface increases causing jetting failures
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by incorporating specific surfactants and adjusting the ratio of water-soluble organic solvents to reduce surface tension and prevent ink adhesion on the jetting surface, allowing larger droplet amounts without compromising continuous jettability
Solution Approach 2:
The patent introduces surfactants as intermediary substances that mediate between the ink and the jetting surface, reducing the adhesion force and preventing ink from sticking to the nozzle, thereby enabling reliable jetting of larger droplet amounts
2Manufacturing precision
If the liquid droplet amount is increased to improve covering property, then the covering property is improved, but ink overflow occurs on the jetting surface
Solution Approach 1:
The patent modifies the physical parameters of the ink by adjusting surface tension through surfactant addition and organic solvent selection, enabling the ink to resist overflow when larger droplet amounts are jetted while maintaining improved covering property
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 enhances ink jettability and covering property by minimizing ink adhesion on the jetting surface, preventing jetting failures and ensuring effective image formation even with larger droplet sizes.
Implementation Method 1
the pigment surface of the titanium oxide is treated with an organic compound
Implementation Method 2
jetting the ink from an ink jet head in a liquid droplet amount of 1.0 pL (picoliter) or greater to apply the ink onto a base material
Data Source
Figure 1
AI summary
Provided is an image recording method including a step of preparing an ink containing water and a white pigment, and a step of jetting the ink from an ink jet head in a liquid droplet amount of 1.0 pL or greater to apply the ink onto a base material, in which in a case where an ink jetting surface of the ink jet head is immersed in the ink in a vertically standing state for 2 seconds, the jetting surface is pulled up from the ink in the state, and the jetting surface is allowed to stand in the state for 1 minute, a ratio of an area of a region to which the ink is adhered to an area of the jetting surface is 40% by area or less.