Structural Analysis of Both Sides Corona Treated Metallized PET Film

Both sides corona treated metallized PET film, with transparent PET (polyethylene terephthalate) as the substrate, lays a solid foundation for the film with its excellent physical properties and chemical stability. One side of the film is aluminized to form a dense metal aluminum layer, which not only gives the film a unique metallic luster, but also plays a key role in barrier performance; the other side is also corona treated to form a special "double-sided protection" structure with the aluminized surface. This double-sided extrusion structure enables the film to achieve optimized arrangement at the molecular level, further enhancing its overall performance. ​

Technical secrets of double-sided corona treatment
As a key technology to improve the surface performance of the film, corona treatment plays an indispensable role in both sides corona treated metallized PET film. When the film passes through the corona discharge equipment, the corona discharge generated between the high-voltage electrode and the ground electrode will form complex physical and chemical changes on the surface of the film. On the one hand, high-energy particles bombard the film surface, causing the surface molecular chains to break and reorganize, increasing the surface roughness; on the other hand, a large number of polar groups are introduced, significantly improving the activity and surface energy of the film surface. The corona treatment of the aluminum-plated surface provides a good foundation for the adhesion of the aluminum layer, enhances the bonding force between the two, and ensures that the aluminum layer is firm and not easy to fall off; the corona treatment on the other side creates conditions for the subsequent composite with other materials, improves the bonding strength of the non-metallic surface with other materials, and allows the film to be closely combined with a variety of materials in the packaging material composite process, expanding the application possibilities. ​

Excellent performance creates packaging advantages​
Both sides corona treated metallized PET film has a smooth and flat texture, which not only improves the visual grade of the product, but also reduces the potential risks caused by roughness on the surface. The film has good stiffness. This physical property enables it to maintain a stable shape during the packaging molding process. Whether it is made into packaging bags, packaging boxes or other packaging forms, it can maintain a regular appearance, which is convenient for the operation and use of automated packaging equipment. In terms of functionality, it has excellent water vapor and gas barrier properties. The aluminum layer acts as a barrier, effectively blocking the intrusion of external water vapor, oxygen and other gases, while preventing the escape of internal gas from the package, providing a stable storage environment for the package contents, and extending the shelf life of products such as food and medicine. After the non-metallic surface is corona treated, the bonding strength with other materials is significantly enhanced, so that the film can be compounded with a variety of materials such as paper and plastic to form a packaging material with better performance and more comprehensive functions, meeting the diverse packaging needs of different products. ​

Meet the stringent requirements of food and drug packaging​
As products that are directly ingested or in close contact with the human body, the safety and functional requirements of their packaging materials are extremely strict. Both sides corona treated metallized PET film, with its own advantages, perfectly meets the packaging needs of these two major fields. In terms of food packaging, it can effectively block external moisture and oxygen, prevent food from getting damp, oxidized and deteriorating, and resist light exposure, avoiding problems such as nutrient loss and flavor change in food due to light, and retaining the quality and taste of food to the greatest extent. For pharmaceutical packaging, its strict barrier properties can prevent the chemical reaction between the drug and the external environment, ensuring the stability of the drug ingredients and the unaffected efficacy; the smooth surface and stable physical and chemical properties also prevent the packaging materials from contaminating the drug and ensure the safety of medication. From snack foods such as biscuits and potato chips to various tablets and capsules, both sides corona treated metallized PET film can provide reliable packaging protection for the product with its own performance. ​