CPP (cast polypropylene) film is a polypropylene film produced by a casting process, which has the characteristics of high transparency, good gloss, excellent stiffness, strong moisture barrier and stable heat resistance. Among them, the softening point of high bonding metallized CPP film is relatively high, usually reaching about 140°C, which provides a solid foundation for its application in high-temperature environments.
The high transparency of CPP film makes the products in the package clearly visible, enhancing consumers' desire to buy; its good glossiness improves the overall aesthetics of the product. At the same time, CPP film has excellent moisture barrier properties, which can effectively prevent the products in the package from getting damp and extend the shelf life of the products. In addition, CPP film has good stiffness and is not easy to deform, providing good support and protection for packaging.
High-viscosity aluminized CPP film is a thin layer of aluminum film formed by vacuum aluminizing process on the basis of CPP film. This layer of aluminum film not only gives the film a bright metallic luster, but more importantly, it combines the high heat resistance of the CPP film, allowing the high-viscosity aluminum-plated CPP film to withstand higher temperatures and show excellent high-temperature resistance.
During the hot filling process, high-temperature liquids often cause certain thermal shocks to the packaging materials. If the heat resistance of the packaging material is insufficient, it is easy to deform, crack or leak at high temperatures, thus affecting the quality and safety of the products in the package. The high-viscosity aluminum-plated CPP film can stably withstand this high-temperature environment to ensure the quality and safety of the products in the package.
The high-temperature resistance of the high-viscosity aluminum-plated CPP film is mainly due to its unique structure and material properties. On the one hand, the high softening point of the CPP film enables it to maintain a stable shape and structure at high temperatures, and it is not easy to deform or crack. On the other hand, the aluminum layer can reflect part of the heat and reduce the temperature of the film surface, thereby further improving its high-temperature resistance.
Due to its excellent high-temperature resistance, the high-viscosity aluminum-plated CPP film has been widely used in the field of high-temperature packaging. The following are some typical application cases:
Hot-fill beverage packaging: Hot-fill beverage refers to the production process of directly pouring high-temperature liquid into the packaging container. This production process has extremely high requirements for the heat resistance of the packaging material. High-viscosity aluminized CPP film can withstand the impact of high-temperature liquid, maintain the shape and structure of the packaging container, and ensure the hygiene and quality of the beverage. Its bright metallic luster can also enhance the visual effect of the beverage and enhance consumers' desire to buy.
Retort bag: Retort bag is a packaging method that puts food into a bag and then retorts it at high temperature. This packaging method can maintain the freshness and nutrition of food and extend the shelf life of food. High-viscosity aluminized CPP film can withstand the high-temperature and high-pressure retort process, maintain the shape and structure of the bag, and prevent food from being contaminated or deteriorating during the retort process. At the same time, its aluminized layer can also reflect part of the heat, reduce the temperature inside the bag, and further protect the quality and safety of the food.
High-temperature retort food packaging: In addition to retort bags, high-viscosity aluminized CPP film can also be used for other food packaging that requires high-temperature retort, such as meat, vegetables, etc. These foods need to withstand high temperature and high pressure during the cooking process, and the heat resistance of the packaging materials is extremely high. High-viscosity aluminized CPP film can meet these requirements and ensure the quality and safety of food during the cooking process.
Other high-temperature applications: In addition to the above typical applications, high-viscosity aluminized CPP film can also be used in other packaging fields that need to withstand high temperature environments. For example, in electronic product packaging, high-viscosity aluminized CPP film can protect electronic products from the influence of high temperature environments; in medical product packaging, high-viscosity aluminized CPP film can ensure the hygiene and safety of medical products.
High-viscosity aluminized CPP film has significant advantages in the field of high-temperature packaging, but it also faces some challenges.
In terms of advantages, high-viscosity aluminized CPP film has excellent high-temperature resistance, can withstand the impact of high-temperature liquids and high-temperature and high-pressure cooking processes, and ensure the quality and safety of the products in the package. At the same time, its bright metallic luster can also enhance the visual effect of the product and enhance consumers' desire to buy. In addition, high-viscosity aluminized CPP film also has good moisture resistance and stiffness, providing good support and protection for packaging.
In terms of challenges, the production cost of high-viscosity aluminum-coated CPP film is relatively high, which limits its application scope to a certain extent. At the same time, with the improvement of environmental awareness, how to reduce energy consumption and waste emissions in the production process of high-viscosity aluminum-coated CPP film is also a problem that companies need to face.
