A printed PET film can pass a dry tape test and still lose adhesion after contact with water. To evaluate this risk, a primed PET film was checked after ice-water exposure.

What Happened?

The PET film was first coated with a water-based primer, then printed with UV ink and placed in ice water.

After removal from the water, adhesive tape was pressed onto the printed area and peeled away. The tape came away without visible ink transfer.

Why the Primer Matters

On PET film, the primer forms the bonding interface between the film and UV ink. Its wet adhesion can be affected by surface treatment, coating uniformity, drying and UV curing.

SA-235 PET film primer is designed for corona-treated PET and BOPET films.

Test According to Final Use

The result applies only to the evaluated film, primer, UV ink and ice-water condition.

Room-temperature water, boiling water, detergent and humidity exposure should be tested separately when relevant to the final application.

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