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The PET film is a polar film that has 45 to 50 dynes without treating the surface tension, that is, the PET film is a film that is very strong regardless of the type of plastic ink printed.

However, after the two-component polyurethane adhesive is applied, after the same film is dry-composited, especially after being laminated with the PE film, the printing ink layer may be adhered to the PET glue to cause delamination (composite thick PE). The phenomenon of film adhesive ink is even worse, that is, the phenomenon that the printing ink layer on the PET film is partially or completely transferred to the inner film after compounding. Because the PET film has excellent barrier properties and is highly resistant to leakage, the solvent is difficult to penetrate, and the solvent inhalation property of the ink is inferior. The connecting material (resin) of the plastic surface printing ink has a good affinity with the PET film, so the printing on the PET film is more secure than the plastic composite printing ink.