What is a Gas-Permeable Sealing liner?
A high-end sealing solution
Vented sealing liner
The core technology involves welding a high-performance microporous membrane onto a perforated sealing film. This design retains the film's spill-proof and freshness-preserving properties while the membrane equalizes internal and external pressure.
Leak Prevention: Seals out contaminants and moisture.
Pressure Equalization: Releases fermentation gases or compensates for altitude-induced pressure changes, preventing bottles from cracking or collapsing.
Customization: Key Parameters of Breathable Membranes
Breathable membranes are tailored based on the chemical nature of the product and the application environment.
Functional Types: Choose from Waterproof, Oil-Proof, Corrosion-Resistant, etc.Air Flow Rate (Critical Metric): Measured in ml/min/cm²@7kPa.
- High Flow (e.g., Liquid Fertilizers, Bleach): Minimum >1000, typically 2000.
- Medium/Low Flow (e.g., Pesticides, Coffee, Protein Powder): Generally ranges between 350~800.
Three Main Types of Permeable Gaskets & Their Applications
Based on cap structures and sealing processes, gaskets are categorized into:
01. One-piece Induction Sealing vented liner (Aesthetic Premium)
Structure: 5-layer composite, 0.21-0.35mm thick, with PET film and EPE foam backing.
Advantages: Sleek appearance with customizable Logo printing for enhanced branding.
Applications: Food Packaging (e.g., protein powder cans, coffee jars). It balances pressure to prevent burst cans while keeping desiccants or contents dry.
02.Two-Piece Induction Sealing vented seals (High Durability & Security)
Structure: Cardboard backing, thicker (0.6-1mm), typically a two-piece design.
Advantages: High corrosion resistance and superior sealing. Requires tools for opening, deterring tampering and preventing leaks.
Applications: Pesticides and Chemical Products. The two-piece structure combined with a corrosion-resistant membrane ensures bottles remain intact and leak-free under harsh chemical conditions.
03.EPE Foam vented Gasket (Lightweight & Cost-Effective)
Structure: Made of EPE foam, integrating sealing and breathability in a single lightweight layer.
Applications: Hydrogen Peroxide (H₂O₂) and other special chemicals, utilizing the foam's elasticity for effective sealing and gas release.
Conclusion