Humidity Control for Inkjet Nozzle Clogging and Medium Wrinkles
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Solution Overview
Problem
Existing liquid discharge apparatuses, such as inkjet printers, face issues with nozzle clogging due to low humidity causing foreign substances to suspend in the air, leading to increased cleaning frequency and ink wastage, and fail to address printing failures due to medium irregularities like wrinkles, especially at extreme humidity levels.
Innovation Solution
A liquid discharge apparatus equipped with a humidity detection unit that controls a humidifying unit to maintain optimal humidity levels within the housing, and adjusts the discharge and transport processes to prevent nozzle clogging and medium irregularities by humidifying when humidity is low and lowering heating unit temperature when humidity is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cleaning is performed frequently to prevent nozzle clogging, then nozzle reliability is improved, but ink consumption increases and productivity decreases
Solution Approach 1:
The system performs preliminary humidification of the housing interior before printing operations begin, and maintains optimal humidity levels throughout the printing process. This preliminary and continuous humidity control prevents foreign substances from suspending in the air, thereby preventing nozzle clogging before it occurs and reducing the need for frequent cleaning operations
Solution Approach 2:
The humidity detection unit continuously monitors the humidity level inside the housing and provides feedback to the control unit. Based on this feedback, the system automatically adjusts the humidifying unit to maintain optimal humidity levels, creating a closed-loop control system that dynamically prevents nozzle clogging conditions without requiring manual intervention or frequent cleaning
2Reliability
If cleaning is performed frequently to prevent nozzle clogging, then nozzle reliability is improved, but ink consumption increases
Solution Approach 1:
The system performs preliminary humidification of the housing interior before printing operations begin, and maintains optimal humidity levels throughout the printing process. This preliminary and continuous humidity control prevents foreign substances from suspending in the air, thereby preventing nozzle clogging before it occurs and reducing the need for frequent cleaning operations that waste ink
Solution Approach 2:
The humidity detection unit continuously monitors the humidity level inside the housing and provides feedback to the control unit. Based on this feedback, the system automatically adjusts the humidifying unit to maintain optimal humidity levels, creating a closed-loop control system that dynamically prevents nozzle clogging conditions without requiring manual intervention or frequent cleaning
3Reliability
If humidity is not controlled when excessively high, then medium irregularities such as wrinkles occur, but adding humidity control increases device complexity
Solution Approach 1:
The humidifying unit serves multiple functions: it prevents nozzle clogging by controlling humidity levels to prevent foreign substance suspension, and it also prevents medium irregularities such as wrinkles by maintaining optimal humidity during printing. This multi-functionality allows a single device addition to address multiple printing reliability issues simultaneously
Solution Approach 2:
The humidity detection unit continuously monitors the humidity level inside the housing and provides feedback to the control unit. Based on this feedback, the system automatically adjusts the humidifying unit to maintain optimal humidity levels, creating a closed-loop control system that dynamically prevents both nozzle clogging and medium irregularities without requiring manual intervention
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 solution effectively reduces nozzle clogging and medium irregularities, minimizing ink consumption and maintaining productivity by optimizing humidity conditions and adjusting operational parameters based on detected humidity levels.
Implementation Method 1
a humidifying unit configured to humidify an interior of the housing
Implementation Method 2
a heating unit configured to heat the medium to which the liquid is discharged from the discharge unit
Data Source
AI summary
A liquid discharge apparatus is provided that includes a transport unit configured to transport a medium, a discharge unit configured to discharge a liquid onto the medium, a housing including therein the discharge unit, a humidifying unit configured to humidify an interior of the housing, and a humidity detection unit configured to detect a humidity. When the humidity detection unit detected a humidity less than a lower limit value (one example of a first predetermined value) (positive determination in step S12), the interior of the housing is humidified by the humidifying unit during transport by the transport unit or during discharge by the discharge unit (step S16).