Magenta Ink Formulation for Line Head Printer Stability
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Solution Overview
Problem
Conventional magenta inks exhibit insufficient storage stability and discharge stability, leading to issues such as curved ink droplet discharge and clogging in line head type printers, especially when left idle for extended periods, and poor image quality due to beading and blurring.
Innovation Solution
An ink formulation incorporating a quinacridone pigment and an organic solvent with a solubility parameter of 9.00 to 11.80, in a ratio of 30% to 60% by mass, which undergoes a heating treatment to maintain viscosity and particle diameter stability, ensuring high dispersion stability and preventing beading and blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pigment concentration in the ink is increased to improve image density, then the image density increases, but the ink becomes viscous, thereby degrading the discharging stability of the ink
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by introducing a specific organic solvent mixture (carboxylic acid ester and cyclic carbonate) with controlled ratios. This parameter change allows the ink to maintain low viscosity even at high pigment concentrations (5-20 mass%), thereby achieving both high image density and stable discharging performance without the trade-off that normally exists between these two properties.
Solution Approach 2:
The patent uses a composite solvent system combining carboxylic acid ester and cyclic carbonate in specific proportions (30-80 mass% and 20-70 mass% respectively). This composite material approach creates synergistic effects where the combination of solvents provides both the solubility needed for high pigment loading and the viscosity control needed for stable jetting, resolving the contradiction between image density and discharging stability.
2Productivity
If a permeating agent, such as a hydrophobic solvent, is added to an ink to improve printing speed and image quality, then the printing speed and image quality improve, but the pigments require high dispersion stability even in inks containing hydrophobic solvent in large amount
Solution Approach 1:
The patent changes the solvent composition parameters by using a specific ratio of carboxylic acid ester to cyclic carbonate (30-80 mass% to 20-70 mass%). This parameter optimization allows the ink to function as a permeating agent for fast drying and high image quality while simultaneously maintaining excellent dispersion stability of pigments, even at high pigment concentrations, thus resolving the contradiction between productivity and composition stability.
3Device complexity
If conventional magenta ink is used in line head type printers that cannot cap the nozzle surface, then the printing process is simple, but the ink exhibits insufficient storage stability and discharge stability, leading to curved ink droplet discharge and clogging
Solution Approach 1:
The patent changes the chemical parameters of the magenta ink by formulating it with a specific combination of carboxylic acid ester and cyclic carbonate solvents in controlled proportions. This parameter optimization ensures that the ink maintains appropriate viscosity and surface tension characteristics for reliable jetting and storage stability, enabling simple line head printers without capping mechanisms to operate reliably without curving or clogging issues.
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 excellent storage and discharge stability, preventing beading and blurring, and maintaining image quality over time, even when used with line head type printers that cannot cap the nozzle surface.
Implementation Method 1
an organic solvent having a solubility parameter of from 9.00 to 11.80
Implementation Method 2
heated at 80° C. for 4 weeks in a sealed state
Data Source
AI summary
An ink is provided. The ink includes a quinacridone pigment and an organic solvent having a solubility parameter of from 9.00 to 11.80 in an amount of from 30% to 60% by mass of total mass of the ink. Both a viscosity change rate and a particle diameter change rate of the ink, before and after the ink is heated at 80° C. for 4 weeks in a sealed state, are in the range of from −5% to 1%.