Answer:
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### **1. Key Points for Operating Aluminum Foil Pull-tab Gaskets**
1. **Pre-installation Preparations**
- Check if the gasket size matches the bottle opening (the diameter should be slightly larger than the bottle opening by 0.5-1mm).
- Confirm whether the gasket material is suitable for the product content (such as food-grade, acid and alkali resistance, etc.).
2. **Hot-Melt Sealing Techniques**
- **Manual Heat Sealing** (without specialized equipment):
- Use an iron or a hair dryer on high heat setting, heat the pad evenly with a layer of cotton cloth (temperature testing is required to avoid burning through).
- Press for 5-10 seconds, then cool and set.
- **Machine Thermal Sealing**：
- Adjust the heat sealing machine parameters (reference values: temperature 180°C ± 10°C, pressure 0.2-0.4MPa, time 1.5-2 seconds).
- Check the edges after sealing to ensure they are flat and free of creases.
3. **Enable Optimization Method**
- If the pull tab is difficult to tear, you can first use your fingernails to make a shallow circle around the edge of the aluminum foil to reduce the resistance of the pull.
- For wide-mouth bottles, it is recommended to choose a "double pull ring" design gasket, which disperses the tension and makes it easier to open.
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### **Section Two: Common Issues and Solutions**
| **问题现象** | **可能原因** | **解决方案** |
|--------------------|----------------------------|--------------------------------|
| Alumina foil edge rises | Heat sealing temperature is insufficient or the time is too short | Adjust the heat sealing parameters and re-seal the pressure |
| The pull tab tear is incomplete | The aluminum foil thickness is insufficient or the cut in the pull tab is too shallow | Replace the aluminum foil with a thicker thickness (e.g., from 30μm to 50μm) |
| Leakage after sealing/air leakage | Bottle mouth is uneven or the gasket is misaligned | Ensure the gasket is centered before sealing and check for burrs on the bottle mouth |
| Residual layers of aluminum foil | The inner layer PE film has not been completely peeled off | Choose the "full tear" gasket or use alcohol to wipe to dissolve the residual |
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### **Section Three: Suggestions for Special Scenario Applications**
1. "High-temperature contents" (e.g., hot-filled sauces):
- Select high-temperature resistant aluminum foil (able to withstand over 120°C), seal the opening, and invert the bottle to test the sealing property.
2. **Liquid Sealing**：
- Prioritize the use of composite aluminum foil gaskets with a 'silicone layer', enhancing the seal's elasticity.
3. **Child-Safe Packaging**:
- Choose the "hidden pull tab" design, which requires the cap's recessed groove to open.
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### **Section 4: Safety and Environmental Protection Tips**
1. Discarded aluminum foil pads should be recycled separately (metal and plastic composite materials should be handled according to local regulations).
2. Avoid discarding torn aluminum foil pieces at will to prevent injuries to people or animals.
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If you are referring to other types of 'foil gaskets' or if you have any further operational questions, please provide more details about the scenario, and we will be happy to assist further!
