Study on evolution law of lateral thickness difference of polymer-coated steel in laminating process

Abstract In order to meet people's requirements for materials saving and environmental protection, the metal packaging industry has proposed a new functional composite material: the polymer-coated steel, which is designed to replace the tinplate in the traditional packaging industry. In this paper, the three-dimensional contour of the Tin free steel (TFS) surface was measured by a white light interference three-dimensional shape analyzer and the endothermic exothermic curve during Polyethylene terephthalate (PET) heating was measured by TG-DSC. The numerical simulation model of the laminating roll-PET-TFS is established according to the difference of the transverse melting thickness of the polymer film during the laminating process. The numerical results showed that the difference of the transverse melting thickness of the PET film gradually decreases with the increase of the initial temperature of TFS and the increase of the filming speed. The optimum film temperature range is found according to the transverse melting thickness difference of PET film. The model of optimum laminating temperature and allowable laminating temperature is established. The optimum process parameters are proposed to control the thickness difference of the film transverse melting with the initial temperature of TFS is 628.15 K and the laminating speed is 100 m / min.