Under refrigerated conditions, what is the effect of the gas barrier properties of PET milk bottles on the shelf life of milk?

Under refrigerated conditions, the gas barrier properties of PET milk bottles are crucial to extending the shelf life of milk. PET materials have good gas barrier properties and can effectively block the penetration of gases such as oxygen and water vapor, thereby reducing the oxidative effects of oxygen on milk and preventing changes in taste, color, and nutrient loss. In addition, PET milk bottles can also prevent water vapor from entering the bottle, maintain the texture and flavor of milk, and prevent deterioration caused by moisture penetration. For milk or dairy products with added carbon dioxide, the gas barrier properties of PET bottles can also help maintain the carbon dioxide content and maintain the texture and flavor of the product.

Under refrigerated conditions, the molecular structure of PET materials is relatively stable, and its gas barrier properties will not weaken due to temperature reduction, so it can effectively maintain the quality and safety of milk at low temperatures. The shelf life of milk is closely related to the refrigeration time. PET milk bottles with good gas barrier properties can extend the storage time of milk under refrigerated conditions, keeping it fresh and nutritious during the shelf life. The gas barrier performance of PET milk bottles is also related to the thickness of the bottle wall. The thicker the bottle wall, the better the barrier effect. Therefore, the thickness design of the bottle wall needs to be optimized according to the shelf life requirements of milk. Some PET milk bottles also adopt a multi-layer structure design, which further reduces the permeation of gas by adding a barrier layer, significantly extending the shelf life of milk.

The gas barrier performance of PET milk bottles needs to be combined with appropriate refrigeration conditions, such as maintaining a constant low temperature environment and avoiding direct sunlight to ensure the stability of milk quality during storage. Through reasonable bottle wall thickness design, the application of multi-layer structure and good refrigeration conditions, PET milk bottles can effectively extend the shelf life of milk, ensuring its freshness and safety during the cold chain process.