When a biaxially oriented polyethylene terephthalate (PET-BO) film is laminated on tin free steel (TFS) at 260°C (melting point of PET) or slightly higher temperatures, the interfacial layer fuses and transforms into an amorphous, non-oriented film. The amorphous PET layer contributes to adhesion to TFS, while the remaining PET-BO layer affects formability and corrosion resistance; a higher fraction of PET-BO leads to better resistance to water permeation and mechanical properties of the overall PET film. On the other hand, adhesion to TFS improves with decreasing fraction of PET-BO in particular for the deep drawn articles of TFS laminated with PET film. Therefore, adhesion and corrosion resistance must be optimized. Optimization is found to be achieved if the fraction of PET-BO in PET film is controlled within 30 to 70%, . Furthermore rapid quenching after lamination of PET-BO film to TFS prevents recrystallization of the amorphous PET and ensures good adhesion to TFS.
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Tanaka et al. (1987) studied this question.
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