How the air tightness of Biaxially Oriented Polypropylene Film improves product freshness?

1. Air tightness properties of Biaxially Oriented Polypropylene Film
Biaxially Oriented Polypropylene Film has undergone a biaxial stretching process during the production process, resulting in good orientation of the polypropylene molecular chains in both the longitudinal and transverse directions. This process not only increases the mechanical strength and toughness of the film, but also significantly improves its air tightness. Biaxial stretching makes the molecular arrangement of the film more uniform, reducing the formation of tiny pores and cracks, thereby effectively blocking the penetration of outside air, moisture and oxygen.

In addition, the surface flatness of Biaxially Oriented Polypropylene Film also helps improve its air tightness. During the production process, the surface of the BOPP film undergoes high-temperature stretching treatment to eliminate surface roughness and make it smoother. This smooth surface not only enhances the gloss of the film, but also reduces the path for gas penetration, thereby improving the sealing and airtightness of the film.

2. Effect of biaxial stretching process on air tightness
The biaxial stretching process of Biaxially Oriented Polypropylene Film is the key to improving its air tightness. By stretching the film longitudinally and transversely during the production process, the molecular chains of the film are elongated and oriented, making the film more uniform and dense. This process not only significantly improves the mechanical properties of the film, but also gives it better gas barrier capabilities.

The stretched Biaxially Oriented Polypropylene Film can effectively prevent the penetration of external air, moisture and oxygen due to its optimized molecular structure. For food packaging, oxygen is one of the main factors causing food oxidation, deterioration and nutrient loss. Through its excellent air tightness, BOPP film can greatly reduce the transmittance of oxygen and moisture, thereby maintaining the freshness and nutrients of food and extending its shelf life.

3. Surface treatment and air tightness of Biaxially Oriented Polypropylene Film
In addition to the biaxial stretching process, the air tightness of Biaxially Oriented Polypropylene Film is also closely related to its surface treatment. In order to further improve the air tightness, BOPP films are usually coated or corona treated during the production process. These surface treatment processes can make the film surface smoother and reduce the possibility of gas penetration.

The coating process is to apply a thin layer of coating on the surface of the film to make the surface of the film more dense, thereby further enhancing its air tightness. The coating layer usually uses polymer materials, which can effectively isolate air and moisture to ensure that the products in the package are not affected by the external environment.

4. Application and freshness improvement of Biaxially Oriented Polypropylene Film
The excellent air tightness of Biaxially Oriented Polypropylene Film makes it an important material in the food packaging industry. Through its excellent barrier properties, BOPP film can effectively isolate air and moisture, thereby delaying the oxidation process of food and maintaining the color, taste and nutritional content of food.

5. Equipment and technical support
The six German Bruckner film production lines used by the company provide strong technical support for the airtightness of Biaxially Oriented Polypropylene Film. The Bruckner production line uses advanced stretching and production technology to ensure a more precise molecular orientation and stretching process of the film, thereby improving the air tightness and barrier properties of the BOPP film.

In addition, the company has 36 coating machines. These equipment allow BOPP films to be surface-coated according to different application requirements, further improving the airtightness and functionality of the film. Customized surface treatment can not only enhance air tightness, but also improve the durability and adaptability of the film to meet the packaging needs of various products.