What distinguishes Aluminum Foil 1235 Double Zero from other alloy types in packaging applications?
Aluminum Foil 1235 Double Zero is characterized by its ultra-thin thickness (typically ≤0.006mm) and high purity (≥99.35%), ensuring superior flexibility and barrier properties for sensitive packaging like pharmaceuticals and high-end food. Its "double zero" designation refers to the near-zero pinhole rate and minimal thickness variation, critical for maintaining consistent sealing performance. Compared to alloys like 8011, 1235 offers better elongation (≥20%) for deep-drawing processes. The foil's excellent light and oxygen barrier properties extend product shelf life significantly.
How is the double-zero thickness achieved in Aluminum Foil 1235 production?
The process involves multiple cold-rolling stages, reducing aluminum ingots to sub-0.006mm thickness through precision rolling mills. A key step is doubling and rolling two foil layers simultaneously, sprayed with release oil to prevent bonding, followed by annealing (300–400°C) to restore ductility. Final slitting ensures width accuracy (±0.1mm). Advanced tension control systems mitigate breakage risks during high-speed rolling.
What are the primary industrial uses of Double Zero 1235 foil?
Dominant applications include:
Pharmaceutical blister packs: The foil's pinhole-free surface ensures moisture and gas barrier integrity.
Capacitor manufacturing: High purity minimizes electrical resistance.
Flexible food packaging: Laminated with polymers for snack bags and dairy lids.
Electronics shielding: Thin yet effective EMI protection.
What quality control measures are critical for Double Zero 1235 foil?
Key tests include:
Pinhole detection using backlight inspection (≤10 pinholes/m²).
Tensile strength verification (60–100 MPa).
Surface hydrophilicity checks for coating adhesion.
Thickness uniformity via laser micrometers (±2% tolerance).
Annealing degree assessment through elongation and hardness tests.
How does Double Zero 1235 foil address sustainability challenges in packaging?
Despite its thinness, 1235 foil is fully recyclable without quality loss, though laminated structures require separation. Innovations like mono-material designs (foil + compatible polymers) simplify recycling. The foil's minimal material usage (0.006mm vs. standard 0.02mm) reduces resource consumption by 70% per unit area. Some manufacturers now use water-based coatings to replace solvent-based adhesives, lowering VOC emissions.
