Liquid Discharge Valve Timing for Stable Coating Quality
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Solution Overview
Problem
Existing liquid discharge apparatuses face issues with unstable discharge amounts and coating quality due to pressure fluctuations when the number of nozzles to be driven changes, leading to inconsistent application of liquids.
Innovation Solution
The liquid discharge apparatus adjusts the valve opening time based on the head pressure and number of nozzles to be driven, using a controller to maintain a constant discharge amount by altering the valve opening time in response to pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of nozzles to be driven changes, then the discharge amount becomes unstable, but maintaining a fixed valve opening time simplifies the control mechanism
Solution Approach 1:
The control mechanism monitors the actual discharge amount and adjusts the valve opening time based on feedback signals. When the number of driven nozzles changes, the system detects the resulting pressure fluctuations and automatically modifies the valve opening duration to maintain stable discharge, resolving the contradiction between reliability and control simplicity
Solution Approach 2:
The valve opening time is made dynamic rather than fixed, allowing it to adapt in real-time based on the number of active nozzles and resulting pressure conditions. This dynamic adjustment enables the system to maintain stable discharge performance while accommodating changes in nozzle configuration without requiring complex manual reconfiguration
2Manufacturing precision
If the valve opening time is adjusted based on head pressure, then the coating quality improves, but the control process becomes more complex
Solution Approach 1:
Pressure sensors provide real-time feedback on head pressure conditions, and the control mechanism uses this information to automatically adjust the valve opening time. This closed-loop control ensures consistent coating quality by compensating for pressure variations without requiring complex manual intervention or multiple separate control systems
Solution Approach 2:
The system dynamically changes the valve opening time parameter based on detected head pressure conditions. By adjusting this single critical parameter in response to pressure variations, the system maintains optimal coating quality while avoiding the need for complex multi-parameter control processes
3Reliability
If the valve opening time is extended to compensate for pressure drops, then the discharge amount stability improves, but the discharge time increases
Solution Approach 1:
The valve opening time is dynamically optimized based on real-time pressure conditions rather than using a consistently extended duration. The system extends the opening time only when and to the extent necessary to compensate for actual pressure drops, minimizing unnecessary time loss while maintaining discharge consistency
Solution Approach 2:
The control mechanism adjusts the valve opening time parameter adaptively, extending it only when pressure drops are detected and calculating the precise extension needed. This selective parameter adjustment maintains discharge amount consistency while avoiding excessive valve opening durations that would unnecessarily increase processing time
Data Source
AI summary
A liquid discharge apparatus includes a liquid discharge head and circuitry. The liquid discharge head has a nozzle hole from which a liquid is discharged and includes a valve to open and close the nozzle hole and a valve driver to drive the valve. The circuitry causes the valve driver to drive the valve to open the nozzle hole for a valve opening time to discharge the liquid onto an object, and changes the valve opening time based on a head pressure applied to the liquid in the liquid discharge head.