Aluminum foil bags are a major cause of secondary pollution of products after sterilization. Conventional chemical or physical disinfection methods impair the quality of packaging materials. Microwave disinfection requires less temperature than conventional heat sterilization and does not have a significant impact on product quality. . In the case of plastic packaging sterilization technology, it is mainly for sealed aluminum foil bags. Because this sterilization is sterilization after sterilization of the articles, chemical methods are generally not used. These killing sterilization technologies mainly have the following types:
1. Hot-packing sterilization method
This is a sterilization method in which a food or beverage heated to 80 to 90 ° C is placed in a hot aluminum foil bag and sealed, and stored at a high temperature or a certain temperature. This treatment method is mainly used for acidic foods with large acidity.
2, Cooking sterilization method
This method is mainly used for some foods that are less acidic, such as meat, fish, poultry, milk, eggs, etc. The sterilization temperature is generally 121 ° C or 134 ° C. The method used is to place an aluminum foil bag (retortment bag) in a high-pressure closed container and heat it with steam or pressurized water. According to the different conditions of the retort pouch during sterilization, it can be divided into static sterilization, rotary sterilization and the like. Pressurized high-temperature sterilization can be divided into saturated steam sterilization, air-pressure steam sterilization, and pressurized water sterilization according to the heating medium used. The widely used ones are sterilized by saturated steam, because the method is economical and reasonable, and the humidity control is convenient.
3, UV sterilization
Aluminum foil bags can also be sterilized by high-efficiency ultraviolet light after packaging food or beverage. When this method is adopted, the irradiation intensity and time of ultraviolet rays are determined depending on the size of the package and the amount of the contents.