Cooling and Humidification Control for Ink Ejection Reliability
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Solution Overview
Problem
Existing image forming apparatuses face issues with ink ejection failures due to low water content in the recording medium, which causes moisture absorption from the nozzles, and high water content leading to paper crinkling, along with inefficient humidification that can result in dew condensation on components.
Innovation Solution
An ejection apparatus comprising a cooling unit to lower the temperature of the recording medium, a humidification unit to humidify the medium at a controlled temperature, and an ejection unit that uses a control system to manage the cooling and humidification processes, ensuring the recording medium has a desired water content and preventing component humidification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If humidification is performed without cooling the recording medium, then the humidification process is simpler and faster, but dew condensation occurs on components and the water content control is inefficient
Solution Approach 1:
The recording medium is cooled down before humidification is performed. This preliminary cooling action prevents dew condensation during humidification by ensuring the medium temperature remains below the dew point, while still allowing efficient water absorption. The cooling unit lowers the temperature of the recording medium to a predetermined temperature before the humidification unit adds moisture.
2Reliability
If the recording medium has low water content, then the paper remains flat and stable, but ink ejection failures occur due to moisture absorption from nozzles
Solution Approach 1:
The water content of the recording medium is precisely controlled by adjusting the humidification parameters. The humidification unit supplies water vapor to the cooled recording medium at controlled rates, achieving the optimal water content range (3-7%) that prevents both moisture absorption from nozzles and paper crinkling. This parameter control ensures reliable ink ejection while maintaining paper stability.
3Object-generated harmful factors
If the recording medium has high water content, then moisture absorption from nozzles is prevented, but paper crinkling occurs
Solution Approach 1:
A water content detection unit continuously monitors the water content of the recording medium during the humidification process. The control unit receives this feedback and adjusts the humidification rate accordingly, stopping humidification when the optimal water content range is reached. This feedback control prevents over-humidification that would cause paper crinkling while ensuring sufficient moisture to prevent nozzle moisture absorption.
4Object-affected harmful factors
If cooling is applied to prevent dew condensation, then component humidification is prevented, but the humidification process becomes more complex
Solution Approach 1:
The system is divided into separate functional units: a cooling unit that cools the recording medium, a humidification unit that adds moisture, and a water content detection unit that monitors the process. Each unit operates independently with its own control, allowing precise management of temperature and humidity without interfering with other components. The control unit coordinates these segmented functions to achieve the desired water content while preventing dew condensation on components.
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 apparatus effectively maintains a desired water content in the recording medium, preventing ink ejection failures and component dew condensation, while ensuring efficient image formation and nozzle protection.
Implementation Method 1
a cooling unit that cools a recording medium
Implementation Method 2
a humidification unit that humidifies the recording medium in a state of the recording medium having a temperature lowered by the cooling unit
Data Source
AI summary
An ejection apparatus is provided and includes: a cooling unit that cools a recording medium; a humidification unit that humidifies the recording medium in a state of the recording medium having a temperature lowered by the cooling unit; and an ejection unit that ejects droplets on the recording medium that is humidified by the humidification unit.