During the production and processing of film-coated products, parameters such as heating temperature and rate, cooling temperature, lamination pressure, drying temperature, as well as material pretreatment and post-printing processes, have a significant impact on the quality of film coating. Selecting effective production process technologies can reduce phenomena such as white spots and cracks in metal packaging film-coated products, thus producing high-quality metal packaging film-coated products. The temperature of TFS, the temperature and diameter of lamination rollers, and the quenching conditions after roller pressing all affect the thickness of the amorphous layer.
When TFS is slowly cooled after film coating, the adhesion of the film to TFS deteriorates due to the recrystallization of amorphous PET. Simultaneously, in the process of metal steel plate coating, the control of strip steel temperature has a significant impact on product quality. Finite element method simulations of the temperature field during the coating process revealed that during the contact between the steel plate and the film, the inner surface of the film quickly reached the highest temperature. Around 0.03 seconds, the outermost layer of the film was heated to the highest temperature, and the temperature of the inner and outer surfaces of the film decreased over time. Process parameters during the coating process have a significant impact on the structure and properties of the product. In actual production processes, modifying polymer films and treating the surface of metal substrates can change the state of the substrate surface. By controlling production process conditions, the quality of metal-coated products can be ensured, the adhesion strength between the film and the metal plate can be improved, thus reducing defects in metal packaging coating.
