Material Composition: Core Structure: 5-layer or 7-layer coextruded film combining PA (Polyamide), EVOH (Ethylene-Vinyl Alcohol Copolymer), and PE (Polyethylene) layers. The EVOH layer (ethylene content: 29-38 mol%) acts as the primary oxygen barrier, while PA enhances puncture resistance and PE provides moisture sealing Functional Additives: Nano-silver (AgNPs): Embedded in the PA layer (50-100 ppm) for antimicrobial efficacy (>99% inhibition of E. coli and S. aureus) UV Blockers: Titanium dioxide (TiO) or carbon dots (CDs) coating, blocking >90% UV and high-energy blue light (HEBL) to prevent lipid oxidation and color degradation in meat Barrier Performance: Oxygen Barrier: EVOH layer achieves ultra-low oxygen transmission rate (OTR ≤0.05 cc/m²/day at 23°C, 0% RH; ASTM D3985), critical for preserving myoglobin stability and preventing meat discoloration Moisture Barrier: PE layers ensure water vapor transmission rate (WVTR ≤0.5 g/m²/day at 38°C, 90% RH; ASTM F1249), minimizing weight loss and freezer burn in frozen meat Functional Properties: Shrinkage & Sealing: Thermal shrinkage ratio 15-30% at 90°C, enabling vacuum skin packaging for form-fitting seals. Heat-seal strength ≥40 N/15mm (ASTM F88) for leak-proof integrity Mechanical Strength: Puncture resistance ≥45N (ASTM D4833) to withstand bone and ice crystals in meat; tensile strength ≥120 MPa (MD) and ≥200 MPa (TD) (ASTM D882) Optical Clarity: >92% visible light transmittance (ASTM D1003) with ≤1.5% haze, enhancing product visibility in retail displays Safety & Compliance: Direct Food Contact: Complies with FDA 21 CFR, EU 10/2011, Halal, and ISO 22000 certifications. Heavy metal migration (Pb, Cd) ≤0.01 mg/kg Sustainability: Recyclable PE/EVOH structure with >90% re-recyclability rate; carbon footprint ≤1.8 kg CO eq/kg (ISO 14067) Product Specifications Physical Parameters Thickness Range: 80-250 μm (EVOH layer: 15-20 μm; PA layer: 10-15 μm; PE layers: 20-30 μm each) Width: 200-800 mm (±0.2 mm tolerance) for compatibility with vertical form-fill-seal (VFFS) machines Roll Dimensions: Core diameter 76 mm (standard) or 152 mm (heavy-duty); max roll weight Barrier Metrics OTR (23°C, 0% RH): ≤0.05 cc/m²/day (ASTM D3985)WVTR (38°C, 90% RH): ≤0.5 g/m²/day (ASTM F1249) UV/HEBL Blocking: >90% at 200-400 nm (ASTM D4329), critical for preventing photo-oxidation in retail lighting Mechanical & Thermal Properties Tensile Strength: ≥120 MPa (MD), ≥200 MPa (TD) (ASTM D882) Elongation at Break: ≥300% (ASTM D882) Thermal Stability: Operational range -40°C to 121°C; withstands retort sterilization at 121°C for 40 mins Processing & Quality Print Compatibility: Supports 8-color rotogravure printing; ink adhesion strength ≥3.5 N/mm (ISO 2409) Shelf Life: 24 months under dry storage (<25°C, RH<40%) Certifications Global Compliance: REACH, LFGB, GB/T 10004, ISO 9001, and ISO 14001
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