Selective Ionizer Control for UFP Emission in Printers
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Solution Overview
Problem
Image forming systems, such as printers, generate ultrafine particles (UFP) during the printing process, which can be excessive and affect air quality, and existing systems lack efficient control mechanisms to manage UFP emission based on printing activity levels.
Innovation Solution
An ionizer and control unit are integrated into the image forming system to selectively turn on or off based on elapsed time since the last printing operation and the cumulative number of printed sheets, controlling the voltage applied to the ionizer to manage UFP emission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the ionizer is continuously operated to reduce UFP emission, then air quality is improved, but the ionizer's lifespan is reduced and energy consumption increases
Solution Approach 1:
The ionizer is operated periodically rather than continuously. The control unit activates the ionizer based on elapsed time since last printing operation and cumulative printed sheet count, turning it on during high-risk periods (frequent printing) and off during low-risk periods (infrequent printing), thus reducing overall operation time while maintaining air quality when needed
Solution Approach 2:
The ionizer operation is dynamically adjusted based on real-time printing activity conditions. The control unit monitors elapsed time and cumulative sheet count to dynamically switch the ionizer on or off, adapting the operation status to current system conditions rather than maintaining a fixed state
2Object-affected harmful factors
If the ionizer is continuously operated to reduce UFP emission, then air quality is improved, but energy consumption increases
Solution Approach 1:
The ionizer operates periodically based on printing activity patterns. The control unit determines operation intervals by monitoring elapsed time and cumulative printed sheets, activating the ionizer only during periods when UFP accumulation is likely, thereby reducing total energy consumption while maintaining air quality during high-risk periods
Solution Approach 2:
The operation parameters of the ionizer are changed based on printing conditions. The control unit adjusts the ionizer's operational status (on/off) according to elapsed time and cumulative sheet count parameters, optimizing energy usage by activating the ionizer only when printing activity indicates a need for UFP control
3Duration of action of stationary object
If selective ionizer control is implemented based on printing activity, then ionizer lifespan is extended and energy consumption is reduced, but UFP emission control may be insufficient
Solution Approach 1:
The control unit uses feedback from monitoring elapsed time since last printing operation and cumulative printed sheet count to determine ionizer operation. This feedback mechanism ensures the ionizer is activated when printing activity patterns indicate UFP accumulation risk, maintaining effective UFP control while reducing unnecessary operation during low-activity periods
Solution Approach 2:
The system performs preliminary assessment of printing activity conditions (elapsed time and cumulative sheets) before activating the ionizer. By evaluating these parameters in advance, the control unit proactively activates the ionizer when conditions suggest UFP control is needed, preventing excessive UFP accumulation while avoiding unnecessary operation
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 approach significantly reduces UFP emission by turning on the ionizer only when necessary, thereby minimizing unnecessary operation and extending the ionizer's lifespan while maintaining low UFP levels below 3.5×10^11 particles/10 min.
Implementation Method 1
An ionizer and control unit are integrated into the image forming system to selectively turn on or off based on elapsed time since the last printing operation and the cumulative number of printed sheets, controlling the voltage applied to the ionizer to manage UFP emission effectively
Data Source
AI summary
An imaging system includes a fixing device, a collection device, and a controller. The collection device collects ultrafine particles (UFP) emitted by the fixing device. The collection device includes an ionizer. The controller turn on the ionizer.