The purpose of chemical treatment in the manufacturing process of metallized PET film is to improve the adhesion of the metal coating to the PET substrate. PET (Polyethylene terephthalate) is a type of plastic that has a smooth surface, which can make it challenging for the metal layer to adhere properly during the metallization process.
To overcome this adhesion issue, a chemical treatment is applied to the PET film. The treatment typically involves the application of special chemical agents or primers on the surface of the PET film before the deposition of the metal layer. These chemical agents modify the surface properties of the PET film, creating a receptive surface that allows for better adhesion of the metal layer.
By enhancing the adhesion between the metal and the PET substrate, the chemical treatment ensures that the metal coating remains firmly attached to the film. This results in improved performance and durability of the metallized PET film, making it suitable for various applications such as packaging, insulation, and decorative purposes.
In summary, the chemical treatment in the manufacturing process of metallized PET film plays a critical role in achieving a strong and durable bond between the metal layer and the PET substrate, thereby enhancing the overall quality and functionality of the film.