Corona treatment, as a surface modification technology, is based on the discharge phenomenon generated by high-frequency and high-voltage electric fields in gases. When the electric field intensity exceeds the breakdown voltage of the gas, the gas molecules are ionized to form plasma. These high-energy plasma particles collide with the film surface, resulting in the breakage of surface molecular chains and the formation of free radicals and polar groups. This process not only increases the roughness of the film surface, but also significantly increases its surface tension, providing more favorable conditions for subsequent material processing.
In the production of both sides corona treated metallized pet film, double-sided corona treatment means corona treatment on both the upper and lower surfaces of the film at the same time. The introduction of this step aims to create an ideal substrate for the uniform deposition of aluminum atoms by changing the physical and chemical properties of the film surface.
The microstructure of the film surface after double-sided corona treatment has changed significantly, and the surface has become more uniform and has moderate roughness. This change is conducive to the uniform distribution of aluminum atoms during the deposition process and avoids the problem of uneven thickness of the aluminum coating caused by uneven surfaces. At the same time, a uniform surface structure can also reduce the "shadow effect" during the aluminum plating process, which is the uneven deposition of aluminum atoms caused by tiny bumps or depressions on the surface.
The uniformity of the aluminum coating not only affects the appearance quality of the product, but is also directly related to its barrier performance, reflective performance and corrosion resistance. Double-sided corona treatment optimizes the surface structure of the film so that the aluminum coating can form a continuous and dense metal film, thereby improving the overall quality of the aluminum coating. This not only enhances the aesthetics of the product, but also significantly improves its performance in practical applications.
Glossiness and reflectivity are important indicators for evaluating the quality of aluminized PET films. Double-sided corona treatment makes the surface of the aluminum coating smoother and flatter by promoting the uniform deposition of aluminum atoms, thus improving its gloss and reflectivity. This change not only makes the product more beautiful and attractive, but also enhances its application value in packaging, printing and other fields.
The uniformity and quality of the aluminum plating layer directly affects the durability and stability of the product. Double-sided corona treatment improves the bonding force with the PET base film by optimizing the structure of the aluminum coating, reducing possible shedding or peeling during use. At the same time, the uniform aluminum plating layer can effectively resist the erosion of the external environment and extend the service life of the product.
As consumers' requirements for product packaging quality and aesthetics continue to increase, the application fields of aluminized PET films are also expanding. Double-sided corona treatment improves the uniformity and quality of the aluminum coating, enabling the product to meet more high-end and special application requirements. For example, in high-end food packaging, the bright appearance and excellent barrier properties of aluminized PET film can effectively protect the freshness and safety of food; in the field of anti-counterfeiting labels, a uniform aluminum coating can provide clearer and more accurate anti-counterfeiting information.
Today, with the increasing awareness of environmental protection, double-sided corona treatment, as an efficient and environmentally friendly surface modification technology, is gradually being favored by more and more companies. By optimizing the production process and reducing waste emissions, double-sided corona treatment not only improves the overall quality of the product, but also promotes the environmental protection and sustainable development of the enterprise.
Although double-sided corona treatment plays an important role in the production of aluminized PET films, its development still faces some challenges. For example, how to further improve the efficiency and uniformity of corona treatment and reduce production costs; how to optimize corona treatment parameters to adapt to different types and thicknesses of PET films; and how to achieve a more environmentally friendly and sustainable product while ensuring product quality. production process, etc.
In response to these challenges, future double-sided corona treatment technology will pay more attention to technological innovation and intelligent development. For example, by introducing advanced sensors and control systems to achieve real-time monitoring and precise control of the corona treatment process; by developing new corona treatment equipment and processes to improve treatment efficiency and uniformity; and by exploring more environmentally friendly and sustainable solutions. Materials and processes promote the green development of the aluminized PET film industry.
