Material Composition Multilayer Structure: Combines 3-7 coextruded layers, typically including polyethylene (PE) as the base polymer blended with TiO pigment (2.5-4.0 wt%) to achieve uniform milk-white opacity and UV-blocking properties1 Functional layers may incorporate EVOH or metallized coatings for enhanced barrier performance7 Barrier Enhancement: Utilizes high-density polymers and nano-additives (e.g., hollow ceramic microbubbles or ZnO nanoparticles) to minimize moisture and gas permeation, achieving Water Vapor Transmission Rate (WVTR) ≤0.3 g/m²/day and Oxygen Transmission Rate (OTR) ≤0.05 cc/m²/day1 Surface Treatment: Corona-treated surfaces (≥38 dyne/cm) ensure superior ink adhesion for printing, while oleic acid amide (0.1-0.3 wt%) reduces the coefficient of friction (COF) to 0.2-0.4 for smooth processing on packaging lines Functional Properties Moisture Resistance: Aluminum foil or EVOH layers block >99.9% moisture ingress, preventing condensation and preserving product integrity in high-humidity environments1 Thermal Stability: Withstands temperatures from -50°C to 85°C, making it suitable for frozen storage, pasteurization, and boiling sterilization1 Mechanical Robustness: High puncture resistance (≥45-50N) and tensile strength (≥120 MPa MD, ≥150 MPa TD) ensure durability during filling, transport, and handling8 Optical Performance: Light transmittance ≤5% (visible spectrum) and UV blocking >90% (200-400 nm) protect light-sensitive contents (e.g., vitamins, dairy products)9 Safety & Compliance Food Contact: Complies with FDA 21 CFR §177.1520, EU 10/2011, and GB 9685 for direct food contact, with heavy metal migration (Pb, Cd) <0.01 mg/kg1 Sustainability: Recyclable PE content (>90%); variants available with **>30% recycled PET or PLA-based** biodegradable options Product Specifications Physical Parameters Thickness: 50-500 μm (customizable; standard ranges: 50-180 μm for packaging, 300-500 μm for insulation) Width: 200-1,500 mm (±0.2 mm tolerance; pre-cut sizes available for e-commerce logistics) Roll Dimensions: Core ID 76 mm/152 mm; max. roll weight 150 kg Barrier & Mechanical Metrics Water Vapor Transmission Rate (WVTR): ≤0.3 g/m²/day (38°C, 90% RH; ASTM F1249) Oxygen Transmission Rate (OTR): ≤0.05 cc/m²/day (23°C, 0% RH; ASTM D3985) Tensile Strength: ≥120 MPa (MD), ≥150 MPa (TD) (ASTM D882) Elongation at Break: ≥300% (ASTM D882) Heat Seal Strength: ≥35 N/15mm (120-160°C sealing range; ASTM F88) Optical & Surface Properties Whiteness Index (WI): ≥85 (Hunter Lab scale; ISO 2813) Haze: ≤10% (ASTM D1003) Gloss: 20-85 GU (60° angle; customizable for matte or metallic finishes) Processing & Quality Control Printability: Supports 8-10 color rotogravure printing with ink adhesion **≥3.5 N/mm** (ISO 2409) Machine Compatibility: Optimized for vertical form-fill-seal (VFFS) machines at speeds of 80-150 bags/minute Shelf Life: 24 months (storage at <25°C, RH<40%) Certifications: ISO 22000, Halal, REACH, and GRS (for recycled variants)
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