biaxially oriented polyester film

biaxially oriented polyester film, top leader plastic.

Biaxially oriented polyester film BOPET film is used as the outer material of retort packaging bags. Commonly used thicknesses are 12-15 μm.

BOPET film has the following advantages:

Good mechanical properties, good rigidity and high strength.

Excellent cold resistance and heat resistance. The applicable temperature range is -70~150℃.

Good water blocking, gas blocking and fragrance retention properties.

It has good antistatic properties, is easy to carry out vacuum aluminum plating, and can be coated with PVDC to improve its heat sealing properties, barrier properties and printing adhesion.

Resistant to grease, most solvents, and weakly acidic and alkaline liquids.

After a slight corona treatment, the surface tension of the BOPET film is sufficient to meet the needs of printing and lamination.

When BOPET film is combined with other heat-sealable materials (such as CPP film) to make bags, even if the temperature of the heat sealing knife is as high as 220~C, the BOPET film will not melt, deform, or stick to the knife, which is beneficial to the composite film. The bag making process proceeds smoothly. Sometimes, composite packaging bags with a BOPA//BOPET//CPP structure are also produced. At this time, both sides of the BOPET film must be bonded and laminated with adhesive. Therefore, a BOPET film that has been corona-treated on both sides should be used. That’s it. And the surface tension on both sides must reach above 50mN/m to ensure strong adhesion on both sides.

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