Aluminum foil pressure-sensitive adhesive is a functional material that combines aluminum foil material with pressure-sensitive adhesive (sticky tape). It has characteristics such as high-temperature resistance, moisture resistance, corrosion resistance, and electromagnetic shielding, and is widely used in packaging, electronics, food, and industrial fields. Here are some guidelines and precautions for the use of aluminum foil pressure-sensitive adhesive:
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### **1. The main application scenarios of aluminum foil adhesive labels**
1. **Food Packaging**
- Suitable for sealing food bags and labels (such as baking food, coffee bags, etc.), which must meet food-grade safety standards.
2. **Industrial Sealing and Labeling**
- High-temperature equipment labels, pipe identification, and electronic component shielding (utilizing the conductivity of aluminum foil).
3. **Pharmaceuticals and Personal Care**
- Sealed drug packaging, cosmetic bottle labels (must be resistant to moisture and chemical corrosion).
4. **Special Protection**
- Electromagnetic shielding stickers, anti-static labels (for electronic devices or sensitive instruments).
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### **Steps for Use**
1. Surface Pretreatment
- **Clean the surface**: Use alcohol or a solvent with no residue to wipe the surface of the item to be adhered, removing oil, dust, or moisture.
- **Drying Process**: Ensure that the surface is completely dry before adhering (moisture can cause the adhesive to fail).
- **Special surface treatment**: For low surface energy materials (e.g., PP, PE plastics), electrostatic corona treatment or primer may be needed to enhance adhesion.
2. **Select the Appropriate Model**
- Choose the aluminum foil adhesive type according to the application scenario:
- **High-temperature resistant type**: suitable for ovens and high-temperature equipment (adhesive must be able to withstand temperatures over 150°C).
- **Food-grade Glue**: Must pass FDA or GB certification for direct contact with food.
- **Conductive/Shielding Type**: Contains conductive adhesive or aluminum foil layer, used for electromagnetic shielding of electronic components.
3. **Cutting and Fitting**
- Cut the aluminum foil adhesive label to the required size, and it is recommended to reserve 1-2mm on the edge to prevent curling.
- Peel off the release paper (protective film), align the adhesive position, and slowly adhere from one end to the other to avoid air bubbles.
- Use a scraping tool or roller to apply even pressure, ensuring that the adhesive fully contacts the surface.
4. Post-curing treatment (optional)
- Some adhesives need to stand for 24 hours to achieve maximum adhesive strength (especially in low temperature or high humidity environments).
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### **三、注意事项**
1. **Environmental Adaptability**
- **Temperature Restrictions**：General adhesive tape can withstand temperatures of about -20°C to 80°C. For high-temperature scenarios, special adhesives are required (e.g., silicone adhesives can withstand temperatures up to 200°C).
- **Humidity Impact**: High humidity environments may reduce the adhesive strength of adhesive tapes, so it is recommended to choose waterproof aluminum foil tapes.
2. **Material Compatibility**
- Avoid adhering to materials with low surface energy, such as silicone and Teflon (PTFE), and use a primer to enhance adhesion.
- When in contact with strong acids, strong bases, or organic solvents, choose a chemically resistant adhesive (such as acrylic adhesive).
3. Long-term maintenance
- Regularly check the edges of aluminum foil tape for rising, and repair or replace in time.
- Long-term outdoor use requires the selection of aluminum foil with UV coating to prevent aging and brittleness.
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### **Section Four: Common Questions and Solutions**
- **Delamination or curling**:
- Cause: Surface contamination, mismatch between adhesive and substrate, insufficient pressure.
- Solution: Re-clean the surface, replace the special adhesive, and increase the application pressure.
- **Aluminum Foil Tearing**：
- Reason: The aluminum foil is too thin or over-bent.
- Solution: Choose thicker aluminum foil (e.g., over 80μm), avoid repeated bending.
- **Printing is blurry**：
- Reason: The aluminum foil surface has not been coated, resulting in poor adhesion of the ink.
- Solution: Use pre-coated aluminum foil (e.g., matte coating) or a specialized printer (e.g., heat transfer printing).
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### **Section Five: Selection Recommendations**
1. **Food Packaging**: Choose aluminum foil tape with food-grade adhesive (certified by FDA or GB 4806.11).
2. **High-temperature scenarios**: Priority should be given to silicone adhesives (temperature resistance of 150°C to 260°C).
3. **Electromagnetic Shielding**: Choose aluminum foil tape with conductive adhesive to ensure good contact with the metal surface.
4. **Outdoor Identification**: Choose UV-resistant aluminum foil with strong acrylic adhesive.
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### **Storage Suggestions**
- Store in a cool and dry place (recommended temperature: 15°C~30°C, humidity: 40%~60%).
- Avoid stacking heavy objects, to prevent the adhesive from becoming stuck and failing after being pressed.
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