When selecting bottle cap liners, the material is typically chosen based on product characteristics, sealing performance requirements, and bottle neck compatibility. Below are the most common types of liner materials along with their features:
Aluminum Foil Liner
Structure: Composed of cardboard, wax layer, aluminum foil, and heat-seal coating
Feature: Seals tightly to the bottle mouth using an induction sealing machine
Advantages: Excellent sealing, moisture-proof, leak-proof, and oxygen barrier
Typical Applications: Food, health supplements, pharmaceutical products.
Heat-seal Foil with Hot Melt Adhesive
Structure: Aluminum foil with a layer of hot melt adhesive on the back
Feature: The adhesive melts during heating and bonds securely to the bottle mouth
Advantages: No need for backing board, efficient sealing
Compatible Bottle Materials: PET, PE, PP
Typical Applications: Medicine, infant formula, cosmetic packaging.
Pressure-sensitive Liner
Structure: Single-layer material that adheres when pressure is applied
Feature: No heating required; adheres naturally when the cap is tightened
Advantages: Easy to use, cost-effective, suitable for dry contents
Limitations: Less secure seal; not suitable for liquids
Typical Applications: Supplements, candy, granular food.
One-piece Foil Liner
Structure: Aluminum foil with a sealing coating; simple construction
Feature: Directly sealed by induction heating; easy for automation
Suitable for: Products that require high sealing performance and automated filling lines.
Peel-off Tab Foil
Structure: Aluminum foil with an integrated pull-tab
Advantages: Easy for consumers to peel off by hand, improving user experience
Typical Applications: Children's supplements, nutritional powders.