PET (Polyester) for Flexible Packaging

Advantages of PET Films

PET film is a versatile packaging material widely used in both food and non-food applications due to its balanced performance.

• High Transparency & Print Quality
  Ensures sharp graphics, vibrant colors, and accurate registration during printing.

• Excellent Mechanical Strength
  High tensile strength and toughness provide resistance to handling, transport, and impact.

• Good Airtightness & Aroma Retention
  Supports product freshness when laminated with suitable barrier layers.

• Thermal Stability
  Maintains dimensional accuracy during high-temperature printing and processing.

• Chemical & Oil Resistance
  Suitable for a wide range of packaged products.

Limitations of PET Films

While PET offers strong performance, certain limitations should be considered.

Considerations

• Not resistant to strong alkalis

• Prone to static electricity generation

• Limited barrier properties when used alone

PET is best used in laminated structures, combined with sealing or barrier layers for optimal performance.

Different Uses of PET Films

• Outer Printing Layer
  PET is commonly used as the outer layer due to its clarity, strength, and heat resistance.

• Middle Structural Layer
  Adds stiffness, strength, and enhanced appearance to packaging.

• High-Temperature Applications
  Suitable for ovenable and microwave-ready packaging when combined with HSPET or coated paper structures.

• Food & Specialty Packaging
  Used in jelly packaging, bakery items, snack packs, and retort applications.

PET-based structures such as PET/HSPET and Coated Paper/HSPET are preferred where heat resistance and sealing compatibility are required.