WAFU
Juicer Airtightness Testing Solution
1. Why conduct airtightness/sealing tests for juicers?
As a kitchen appliance, juicers often operate in humid and splash-prone environments. Poor sealing performance may lead to:
| Issue | Detailed Description |
|---|---|
| Liquid penetration into motor/control chamber | Causes short circuits, electric leakage, or damage |
| Failure to pass IPX4~IPX7 waterproof rating tests | Unable to launch on market or export |
| Liquid leakage contamination | Poor user experience, increased product complaints |
| Increased leakage risk under high-pressure juice impact | Design lacks sealing verification, causing after-sales issues |
| Liquid leakage caused by pressure changes during transportation | Packaging contamination, increased return rate |
Figure 1: Juicer Shell Illustration
Case Study
In 2022, a Guangdong brand juicer was reported for leakage issues after launching on Amazon’s European and American markets. Inspection found that in some batches the motor compartment sealing ring at the base was improperly installed. The company introduced a dual-channel airtightness tester (mass flow method) to perform 100% testing of the motor chamber. The leakage limit was set to ≤0.3 sccm, effectively controlling defect rates below 0.5%, and successfully passed European CE certification and IPX5 whole-machine waterproof testing.
2. Suitable methods for juicer sealing tests
Testing Method Comparison
| Method No. | Method Name | Principle | Features |
|---|---|---|---|
| 1 | Mass Flow Method | Real-time monitoring of the volume of leaked gas per unit time | High accuracy, fast response, suitable for whole machine or key component sealing tests |
| 2 | Pressure Decay Method (Differential Pressure) | Determines leakage by detecting pressure drop | Suitable for component-level testing, such as sealing rings at juice outlet, cup body joints |
| 3 | Water Test (Used in early development) | Immerses whole machine or parts in water to observe bubbles | Highly destructive, low efficiency, not suitable for mass production |
3. Recommended Testing Process (Example: Whole Machine Mass Flow Method)
| Step No. | Detailed Step |
|---|---|
| 1 | Product clamping: Install the juicer main body into the test fixture, sealing the test area (e.g., motor chamber) |
| 2 | Pressurization: Set test pressure (e.g., 80~100kPa) and inject clean compressed gas |
| 3 | Pressure stabilization and monitoring: Maintain constant pressure and detect leakage flow (in sccm) |
| 4 | Judgment criteria: Determine leakage based on flow value and output OK/NG signal |
| 5 | Automatic recording: Log data into system for quality traceability |
4. Conclusion
The airtightness of juicers directly affects their waterproof rating, safety performance, and user satisfaction. Using airtightness testers to check sealing of the whole machine and key areas is a standard procedure to ensure product reliability, leak prevention, and waterproof compliance.