Influence factors of acetaldehyde content in PET bottles on filling beverages

In the production process of ordinary bottles, especially non-pressure bottles, there is a higher requirement for reducing the acetaldehyde content. This is because non-pressure bottles are mainly used to hold pure water or mineral water with a lighter taste. Acetaldehyde is non-toxic, However, a very small amount of acetaldehyde can make the taste of water change and the hot-fill bottle is basically used to hold heavy beverages. A small amount of acetaldehyde does not affect its taste. In addition, acetaldehyde can be above 21 degrees Celsius. Volatilization is released. Under the premise of higher mold and preform temperature, a considerable amount of acetaldehyde will be volatilized.

AA in PET bottles comes from the process of polycondensation of PET bottles, but also from bottle drying and injection molding. After the resin is heated, its molecular chain will be broken, resulting in vinyl (or olefin) compounds that will generate AA; the chain ends of PET will also generate AA after oxidation.
If there is AA in the bottle, it will soon be transferred into the beverage; the longer the drink is stored, the more AA will be transferred to the beverage; a test shows that the AA in the beverage is initially 0, 20 days and is 90 ppm. 130 ppm after 60 days and 170 ppm after 160 days

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