Printhead Immiscible Fluid Layer for Nozzle Drying Prevention
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Solution Overview
Problem
Inkjet printers face issues with ejection fluid nozzles drying out, leading to clogging and reduced print quality due to the evaporation of water-based inks, which requires regular maintenance and a separate servicing assembly, increasing the overall cost of the printer.
Innovation Solution
An ejection fluid-impermeable layer of low-volatility, immiscible fluid is formed within the printhead nozzles to prevent evaporation, using an immiscible fluid chamber and ejection mechanism integrated into the printhead, eliminating the need for a separate servicing assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate servicing assembly is provided to prevent nozzle drying, then print quality is maintained, but device complexity and cost increase
Solution Approach 1:
The patent merges the servicing function into the printhead by integrating an immiscible fluid chamber and fluid ejection mechanism directly into the printhead structure. This eliminates the need for a separate peripheral servicing assembly, reducing device complexity while maintaining the ability to prevent nozzle drying through periodic immiscible fluid ejection.
Solution Approach 2:
The printhead performs its own maintenance function by incorporating an autonomous fluid ejection mechanism that periodically ejects immiscible fluid into the nozzles to prevent drying. This self-service capability eliminates the need for external servicing assemblies and reduces overall system complexity.
2Reliability
If regular maintenance is performed to prevent nozzle clogging, then print quality is maintained, but production time is lost
Solution Approach 1:
The patent applies preliminary action by periodically ejecting immiscible fluid into the nozzles during idle periods to prevent drying and clogging before it occurs. This proactive maintenance approach ensures nozzle functionality is maintained without requiring extensive downtime, as the fluid ejection occurs during brief idle moments between printing tasks.
3Manufacturing precision
If water-based ejection fluid is used for printing, then print quality is achieved, but evaporation causes nozzle drying and clogging
Solution Approach 1:
The patent introduces an immiscible fluid as an intermediary substance that forms a protective layer over the water-based ejection fluid in the nozzles. This intermediary layer prevents direct evaporation of the water-based fluid while allowing the printing function to continue, as the immiscible fluid does not mix with or interfere with the ejection fluid's printing capability.
Solution Approach 2:
The immiscible fluid creates an inert environment within the nozzles by forming a barrier that prevents the water-based ejection fluid from evaporating. This protective atmosphere maintains the fluid's composition and prevents clogging, while the printing process continues uninterrupted.
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 reduces downtime and production costs by maintaining the printhead without a peripheral apparatus, ensuring high print quality and efficiency with negligible downtime.
Implementation Method 1
An ejection fluid-impermeable layer of low-volatility, immiscible fluid is formed within the printhead nozzles to prevent evaporation
Implementation Method 2
forming an ejection fluid-impermeable layer of a low-volatility, immiscible fluid
Data Source
AI summary
A printhead of a printer includes a nozzle plate having a first layer, a second layer, and an intermediate channel. The first layer can have at least one fluid chamber for holding an immiscible fluid, and a plurality of ejection fluid chamber for holding an ejection fluid. The second layer can have a plurality of ejection fluid nozzles, one ejection fluid nozzle being in fluid communication with one ejection fluid chamber. The intermediate channel can form a passage between the first layer and the second layer. Further, the intermediate channel is in fluid communication with the fluid chambers to carry the immiscible fluid from the fluid chambers towards each of the ejection fluid nozzles for forming a layer of the immiscible fluid over the ejection fluid chambers to maintain the printhead.