PET/VMPET/LLDPE High Barrier Flexible Packaging film

This is a classic three-layer laminated high-barrier flexible packaging structure. It combines the strength and printability of PET, the exceptional gas and moisture barrier of Metallized PET (VMPET), and the excellent heat-sealability and flexibility of LLDPE. It is a workhorse material for demanding packaging applications requiring extended shelf life.

1. Product Structure & Function

Total Thickness: Typically between 60 - 120 μm, customizable based on requirements.

2. Key Performance & Technical Parameters

1. Exceptional Barrier Properties:

   • Oxygen Transmission Rate (OTR): Can be as low as ≤ 2.39 cm³/(m²·24h·0.1MPa), with high-performance grades reaching below 0.6 cm³/(m²·24h·0.1MPa).

   • Water Vapor Transmission Rate (WVTR): Can be as low as ≤ 2.2 g/(m²·24h), with high-performance grades reaching 0.35 g/(m²·24h).

2. Excellent Physical & Mechanical Properties:

   • High Strength & Stiffness: PET and VMPET provide high tensile strength and good dimensional stability.

   • Good Heat Seal Performance: The LLDPE sealing layer ensures a wide sealing temperature window and strong seal strength.

   • High Bond Strength: Layers are laminated with professional adhesives, ensuring high peel strength to prevent delamination.

3. Other Characteristics:

   • Light Barrier: The aluminum layer provides complete opacity, protecting light-sensitive contents.

   • Aesthetic Appeal: The metallized layer gives a brilliant metallic sheen, enhancing shelf appeal.

   • Moderate Temperature Resistance: Suitable for mild thermal processes like pasteurization.

3. Primary Applications

This laminate is a standard choice for premium packaging in:

• Food Packaging: Coffee, milk powder, tea, nuts, fried snacks (chips), dried foods, condiments—any product requiring high moisture and oxygen barrier.

• Pharmaceutical & Medical Device Packaging: Sachets for powders/granules, and sterile packaging for some medical devices.

• Cosmetics & Personal Care: Premium sheet masks, wet wipes, and single-use shampoo sachets.

• Other: Moisture-sensitive packaging for precision instruments and electronic components (using specific grades of VMPET).

4. Production Process & Suppliers

• Production Process: Mainly produced via dry lamination​ (using solvent-based or solvent-free adhesives) or extrusion lamination​ (using molten polyethylene like LDPE as the adhesive layer).

• Key Suppliers: Numerous flexible packaging converters globally supply this structure. Major global film producers like Toray, DuPont Teijin Films, Jindal Films, and Cosmo Films​ supply the high-quality base films. Many converters in Asia (China, India, Vietnam) are major manufacturers of the finished laminate.

5. Comparison with Similar Structures

• vs. BOPP/VMPET/LLDPE: Replaces the outer PET with BOPP. BOPP is slightly lower cost with good printability and gloss, but generally has lower mechanical strength and temperature resistance than PET.

• vs. PET/AL/LLDPE: Replaces the middle VMPET with aluminum foil (AL). Foil offers the absolute best barrier and complete light block but can develop pinholes when flexed, is opaque, and is often more expensive.

• vs. Transparent High-Barrier Structures (e.g., PET/SiOx/LLDPE): Uses a transparent ceramic coating (like SiOx) instead of metallization, allowing product visibility. Typically higher cost, and mechanical barrier (puncture) still relies on the base films.

Summary: PET/VMPET/LLDPE is a balanced, mature, and cost-effective heavyweight high-barrier flexible packaging solution. It is ideally suited for dry, crispy foods and certain pharmaceutical products with stringent shelf-life requirements.