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Sealing aluminum foil is widely used for:
| Material Structure | e.g., Paper (40g) / Aluminum Foil (30μm) / PE Sealant (50μm) |
| Total Thickness | Approx. 120 – 200 μm |
| Aluminum Foil Thickness | 20μm – 50μm |
| Heat Seal Layer | PE, PP, or specialized sealant (for PET, PS, etc.) |
| Seal Strength | 5 – 15 N/15mm (peelable) or > 20 N/15mm (destructive) |
| Oxygen Transmission Rate (OTR) | < 1.0 cm³/m²·day·atm (Excellent barrier) |
| Water Vapor Transmission Rate (WVTR) | < 1.0 g/m²·day (Excellent barrier) |
| Printing | Flexo, Gravure, or Offset printing up to 8 colors |
| Form | Sheets, Discs, or Rolls (custom die-cut shapes available) |
| Diameter/Size | Customized to fit your container opening (e.g., 60mm, 80mm, 100mm) |
Q1: What is the difference between induction sealing and conduction sealing?
A: Induction Sealing: Uses an electromagnetic field to heat a thin layer of aluminum foil inside the seal, activating the sealant. Works through non-conductive lids (plastic). Conduction Sealing: Applies heat directly to the seal surface. Used for all types of seals, but requires direct contact. Induction is faster and more common for high-speed lines.
Q2: Can the seal be designed to be easy-peel?
A: Yes, by using a specific sealant formulation and structure, we can produce “peelable” seals that consumers can remove easily by hand, leaving a clean rim. The required peel force can be adjusted.
Q3: Is the aluminum foil layer safe for direct food contact?
A: In a laminated seal, the aluminum foil is typically sandwiched between an outer layer (paper/print layer) and an inner heat-seal layer (food-grade PE/PP). The food contacts only the inner food-grade plastic layer, not the aluminum directly, ensuring safety.
Q4: How do I choose the right seal structure?
A: The structure depends on your container material, filling process, and barrier requirements. Common structures include:
We provide selection guidance.
Q5: What is the MOQ for custom-printed seals?
A: MOQ for printed, die-cut seals typically starts at 100,000 pieces per design/size. For plain/unprinted seals, MOQ can be lower (e.g., 50,000 pieces).
Q6: Do you provide samples for sealing tests?
A: Yes, we strongly recommend and provide free samples of our seal laminates for you to test on your specific containers with your sealing equipment to ensure compatibility and performance.
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