Moisture Retention Cap Overflow Structure for Nozzle Protection
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Solution Overview
Problem
Existing liquid jetting apparatuses face issues with nozzle drying due to solvent evaporation when not in use, leading to jetting abnormalities, and previous solutions fail to effectively manage moisture retention liquid levels to prevent both swelling and evaporation, affecting jetting performance.
Innovation Solution
A moisture retention device with a cap featuring an overflow starting point on its wall, which allows the moisture retention liquid to be discharged when it reaches a certain level, preventing contact with the nozzle surface and maintaining a stable liquid surface, thereby enhancing jetting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between the cap and the nozzle surface is increased to prevent bridge formation, then the bridge between moisture retention liquid and nozzle surface is prevented, but evaporation of moisture retention liquid occurs and the amount of liquid decreases
Solution Approach 1:
The overflow starting point is positioned in advance at a specific height from the nozzle surface, enabling the liquid level to be controlled before contact with the nozzle occurs. This preliminary positioning prevents both bridge formation and excessive evaporation by establishing a safe liquid level threshold.
Solution Approach 2:
The overflow starting point acts as an intermediary structure between the moisture retention liquid and the nozzle surface. It mediates the liquid level control, allowing the liquid to reach a certain height without causing bridge formation while preventing excessive evaporation through controlled overflow.
2Quantity of substance
If the liquid surface of moisture retention liquid swells due to surface tension, then the liquid level rises, but a bridge between the liquid and nozzle surface is formed deteriorating jetting performance
Solution Approach 1:
The overflow starting point provides a feedback mechanism where the liquid level is automatically controlled. When the liquid rises due to surface tension, the overflow starting point activates to discharge excess liquid, maintaining the liquid level within a safe range and preventing bridge formation.
Solution Approach 2:
The system uses the liquid's own surface tension and gravity to automatically control the liquid level. The overflow starting point enables the liquid to self-regulate by overflowing when the level becomes too high, eliminating the need for external control mechanisms.
3Manufacturing precision
If a sensor and precision supply mechanism are used to control liquid level, then the liquid surface swelling is controlled, but the device complexity increases
Solution Approach 1:
The overflow starting point creates a self-regulating system that uses the liquid's own properties (surface tension, gravity) to control the liquid level. This eliminates the need for complex sensors and precision supply mechanisms, achieving simple and effective liquid level control.
Solution Approach 2:
The invention extracts and utilizes the natural physical properties of the liquid (surface tension and gravity) to achieve liquid level control, removing the need for complex external control systems. The overflow starting point leverages these inherent properties for automatic regulation.
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 overflow starting point effectively manages moisture retention liquid levels, preventing nozzle surface contact and maintaining a stable liquid surface, thus improving jetting performance by avoiding both swelling and evaporation issues.
Implementation Method 1
the liquid surface of moisture retention liquid stored in a cap swells due to the surface tension of the moisture retention liquid
Implementation Method 2
a wall of the housing is provided with an overflow starting point having a structure that penetrates the wall
Data Source
AI summary
Provided are a moisture retention device, a maintenance device, and a liquid jetting apparatus with which it is possible to avoid contact between moisture retention liquid stored in a cap and a nozzle surface. The moisture retention device includes the cap for moisture retention of the nozzle surface of a liquid jetting head, the cap includes a liquid retention portion (488D) in which moisture retention liquid is retained, the liquid retention portion is a housing of which an upper surface (488C) is open, and a wall (488B) of the housing is provided with an overflow starting point (510) having a structure that penetrates the wall.