What is PET?

PET film, also known as polyester film or polyethylene terephthalate film, is a versatile and widely used packaging material.

PET film possesses excellent mechanical, optical, and barrier properties, making it suitable for various applications in packaging, electronics, industrial, and graphic arts industries.

Ployester Film
Usage Temperature
Common Thickness
12um, 15em, 23um
Excellent mechanical strength
High hardness
High barrier
Good dimensional stability

PET Series

Common PET
High Barrier PET
Special PET
  • General PET: Normal packaging
  • White PET: Sauces packaging
  • Transparent PET:
    KPET: For Snacks pakaging
    TPET:Cover film for jelly
  • MPET: Rewind film for puffed foods
  • Mate PET: Normal packaging
  • Heat Sealing PET: for light weight packaging
  • Stretch PET
  • 1/2 PET
  • MPET: Normarl enhance MPET for zipper pouch and enhance MPET for retort pakaging
  • Recyclable PET
  • The Advantages of PET films

    Polyethylene Terephthalate (PET) film is a versatile packaging material widely employed in both food and non-food packaging due to its comprehensive performance.

    Its advantages mainly include:

    • Excellent Transparency and Gloss:

      PET film exhibits superior transparency and gloss. It can be manufactured in extremely thin layers, providing high clarity. When used as a printing layer in packaging bags, the ink presents a better visual effect, resulting in more vibrant colors.

      Often, the lack of substrate transparency can lead to color misalignment after adjusting the ink to the correct shade. PET’s high transparency effectively addresses this issue, ensuring optimal printing results.

    • Good Airtightness and Aroma Retention:
      PET film boasts outstanding mechanical properties, with the best toughness among all thermoplastic plastics. Its tensile strength and impact resistance are significantly higher than those of general films.

      Additionally, it has good stiffness, and dimensional stability, making it suitable for secondary processing such as printing and paper bag manufacturing.

    • Superior Mechanical Performance.With inherent color, kraft paper allows for artistic beauty in printing without the need for full-page printing, resulting in cost savings and reduced printing cycle time.
    • Excellent Heat and Cold Resistance, Chemical Resistance, and Oil Resistance:
      PET film also features excellent heat and cold resistance, along with good resistance to chemical substances and oils.

      However, it is not resistant to strong alkalis and tends to generate static electricity.

      As of now, there is no specific method to address static electricity, so caution should be exercised when packaging powdery substances.

      Its temperature resistance can reach up to 250 degrees Celsius. After high-temperature oven printing, PET film is less prone to stretching, resulting in higher accuracy in overprinting.

    The Drawbacks of Kraft Paper

    However, PET film also has some potential drawbacks:

    • Not Resistant to Strong Alkalis:
      Due to its intolerance to strong alkalis, special attention is required when packaging powdery substances.
    • Prone to Static Electricity:
      PET film may generate static electricity, leading to unfavorable usage effects.

    In summary, PET film is a material with several notable advantages, but it also comes with certain limitations.

    When deciding whether to use PET film, it is essential to assess based on specific needs and conditions.

    Different Useags of PET Films

    When deciding whether to use PET film, it is essential to assess based on specific needs and conditions.

    • When PET is used as the outermost layer, it is typically employed as the printing layer. The transparency and temperature resistance of PET film makes it highly suitable for use as a printing layer.
    • When PET is used in the middle layer of the structure, it provides the bag with increased stiffness and a more appealing appearance.

      With an oxygen transmittance rate of ≤120cm³/(m²∙24h∙0.1Mpa), it also enhances the overall barrier properties.

    • RCPP will melt at a high temperature of 150 degrees and is not suitable for high-temperature microwaving or ovens, but PET has a temperature resistance of up to 250 degrees.

      When food packaging is intended to go directly into the microwave or oven, bags typically opt for PET/HSPET or Coated Paper/HSPET.

      Coated Paper/HSPET is commonly used for packaging items like bread.

    • Our jelly is typically packaged using PET sheets, and the sealing lid film requires one with the same material for proper sealing. Therefore, we have opted for HSPET.

    Other Applications of PET film

    Speaking solely of PET film, its practical applications are incredibly diverse. For instance, as mentioned earlier, it is used in packaging bags.

    Adhesive tapes for sealing boxes and fixing tasks in various industries.

    Protective films for electronic products to guard against static electricity, dust, and moisture damage to electronic components.

    Due to its high light transmittance and electrical insulation properties, PET serves as an encapsulation material for solar cells.

    In the medical field, it provides good breathability and moisture retention for dressings and substrate materials.

    PET is also utilized in manufacturing automotive interior materials such as roof liners and door panels,

    As well as in construction materials as a covering film for protecting external walls and roof sections.

    In the textile industry, PET is applied for coating and processing to provide waterproof, dustproof, and antistatic functionalities.

    As technology continues to advance and innovate, the applications of PET film across various sectors are continually expanding and deepening.

    Start With KDW

    Please contact us for more info of the flexible packaing, our expert term will get in touch with you timely.

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