Maintenance Liquid for Conductivity Detection in Ink Jet Heads
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Solution Overview
Problem
Conductivity-based sensors in printing apparatuses are ineffective in detecting maintenance liquids, and existing maintenance liquids do not provide sufficient performance for maintaining ink jet heads, leading to issues like corrosion and clogging.
Innovation Solution
Aqueous maintenance liquid containing inorganic alkalis, ethylenediaminetetraacetic acid compounds, organic acids, and organic alkalis, with a conductivity of 100 μS/cm or more and pH of 6.0 to 11, designed to be detectable by conductivity-based sensors and prevent corrosion and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional maintenance liquids are used, then they can provide moisturization for the ink jet head, but they cannot be effectively detected by conductivity-based sensors
Solution Approach 1:
The patent changes the electrical conductivity parameter of the maintenance liquid by adding specific inorganic salts (sodium chloride, potassium chloride, calcium chloride, magnesium chloride) to achieve a conductivity of 50-500 μS/cm. This parameter modification enables reliable detection by conductivity-based sensors while maintaining the liquid's moisturization and maintenance functions for the ink jet head.
2Reliability
If existing maintenance liquids are used, then they can be supplied to the capping device, but they do not provide sufficient performance for preventing corrosion and clogging
Solution Approach 1:
The patent creates a composite maintenance liquid formulation that combines multiple functional components: inorganic salts for conductivity and corrosion prevention, chelating agents (EDTA or GLDA) for metal ion binding and clogging prevention, and buffering agents for pH control. This composite composition provides enhanced maintenance performance by addressing multiple issues (corrosion, clogging, detection) simultaneously.
Solution Approach 2:
The chelating agents (EDTA or GLDA) act as intermediary substances that bind metal ions in the maintenance liquid and on capping device surfaces, preventing corrosion and clogging. These intermediaries mediate between the maintenance liquid and the capping device members, protecting the device while maintaining liquid stability.
3Reliability
If the maintenance liquid conductivity is increased for better sensor detection, then detection reliability improves, but the liquid may become more corrosive
Solution Approach 1:
The patent converts the potentially harmful effect of high conductivity (which could indicate high corrosiveness) into a beneficial detection feature. By carefully selecting inorganic salts and controlling their concentrations to achieve 50-500 μS/cm conductivity, the liquid becomes easily detectable by sensors. Simultaneously, the addition of chelating agents neutralizes the corrosive potential by binding metal ions, thus converting what could be a harmful high-conductivity liquid into a beneficial, detectable, and non-corrosive maintenance liquid.
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 maintenance liquid effectively maintains ink jet heads by preventing corrosion and clogging, ensuring reliable detection and prolonged apparatus performance.
Implementation Method 1
a conductivity-based sensor for measuring the electrical conductivity of the maintenance liquid is used to detect the state of the remaining maintenance liquid
Data Source
AI summary
A maintenance liquid is used to maintain an ink jet head of a printing apparatus configured to eject an ink for printing from the ink jet head. The maintenance liquid is aqueous and subject to detection by a conductivity-based sensor. The maintenance liquid includes at least one selected from the group consisting of inorganic alkalis and ethylenediaminetetraacetic acid compounds and at least one selected from the group consisting of organic acids and organic alkalis. The maintenance liquid has an electrical conductivity of 100 μS/cm or more and a pH of 6.0 to 11.