As the core process for the preparation of semi-metallized PET film, the secret of vacuum aluminum plating technology lies in the physical evaporation principle under high vacuum environment. In a closed vacuum chamber, metallic aluminum is heated to the evaporation temperature and then escapes in the form of gaseous aluminum atoms. These atoms diffuse freely in the vacuum and finally deposit on the surface of the PET film to form an extremely thin and uniform aluminum layer. This process requires not only a high degree of vacuum to avoid contamination or scattering of aluminum atoms during the deposition process, but also precise control of parameters such as the distance, angle and deposition time between the evaporation source and the PET film to ensure the uniformity and thickness of the aluminum layer.
The first major feature of semi-metallized PET film given by vacuum aluminum plating technology is the extremely thin and uniform aluminum layer formed on its surface. Although the thickness of this aluminum layer is only nanometers, it is enough to give the film a metallic luster, making it shine in the sun. More importantly, this aluminum layer also gives the film excellent reflective properties. Due to the high reflectivity of aluminum, the semi-metallized PET film can effectively reflect the incident light back to form a bright glossy effect. This reflective property not only enhances the visual beauty of the film, but also makes it widely used in reflective materials, optical films and other fields.
In addition to metallic luster and reflective properties, another major feature of semi-metallized PET film given by vacuum aluminum plating technology is the strong bonding force between the aluminum layer and the PET film. The formation of this bonding force is due to the interaction between aluminum atoms and surface molecules of the PET film during the vacuum aluminum plating process. During the vacuum aluminum plating process, aluminum atoms hit the surface of the PET film at an extremely high speed, collide with the surface molecules and embed into them, forming a chemical bond. This chemical bonding not only enhances the bonding force between the aluminum layer and the PET film, but also makes the aluminum layer less likely to fall off or peel off when subjected to external forces. This strong bonding force provides a strong guarantee for the wide application of semi-metallized PET film in packaging materials, building materials and other fields.
In order to further improve the quality of semi-metallized PET film, vacuum aluminum plating technology is also being continuously optimized and innovated. On the one hand, by improving the design of the evaporation source and the selection of materials, the evaporation efficiency and uniformity of aluminum atoms can be improved, thereby further improving the thickness and uniformity of the aluminum layer. On the other hand, by introducing advanced technologies such as ion bombardment and laser-assisted evaporation, the interaction between aluminum atoms and the surface molecules of PET film can be enhanced, and the bonding force between aluminum layer and PET film can be further improved. In addition, the performance and structure of aluminum layer can be optimized by adjusting the process parameters in vacuum aluminum plating, such as evaporation temperature, deposition time, vacuum degree, etc., to meet the diversified needs of semi-metallized PET film in different fields.
Thanks to the exquisite application of vacuum aluminum plating technology, semi-metallized PET film has shown excellent quality and application value in many fields. In the field of packaging materials, semi-metallized PET film has become an ideal packaging material for high-end tobacco, alcohol, gift boxes and other products with its metallic luster and excellent barrier properties. In the field of reflective materials, semi-metallized PET film has become the first choice for reflective materials such as traffic signs and safety warning signs with its high reflectivity and good weather resistance. In the field of optical films, semi-metallized PET film has become an important component of optical films such as liquid crystal displays and touch screens with its high light transmittance and excellent reflective properties. In the field of building materials, semi-metallized PET film has become the preferred material for building materials such as solar collectors and thermal insulation windows with its good thermal insulation properties and beautiful appearance.
