At present, the production method of HDPE plastic bottle milk beverage on the market is mainly secondary sterilization. That is, after the milk beverage is subjected to the ultra-high temperature sterilization treatment and the filling and sealing process is completed, the milk beverage is subjected to heat sterilization treatment at a temperature of 85° C. or higher for 15 minutes. This processing method makes the product heat for a long time, high energy consumption, has a certain negative impact on the maintenance of the product's nutrient content and flavor, basically belongs to the eliminated production methods. However, due to the low investment in equipment for secondary sterilization and the high profitability of products, it still occupies a major position in the production of children's milk beverages.
Hot filling and super clean filling are the two forms of production that occupy a dominant position in the production of PET bottle acidic milk beverages. After ultra-high temperature sterilization, the milk beverage is filled into a PET bottle at a temperature of 87° C. or more, and then cooled through a cooling tunnel to form a finished product. This kind of production method makes the heating time of the product longer; at the same time, the grammage of the PET bottle is required to be relatively high, and in the shape design, there must also be ribs to prevent the shape of the bottle from changing after the high-temperature filling.
Aseptic cold filling technology is an advanced filling production method that has risen in foreign countries in recent years. When using aseptic cold filling technology, milk beverages are rapidly cooled to 25°C after ultra-high temperature sterilization and filled into sterilized PET bottles in a sterile environment. With the aseptic cold filling technology, the gram weight of the bottle can be reduced much more than the hot filling method. The shape of the bottle can also be designed flexibly and is no longer limited by the ribs. At the same time, the aseptic cold-filled milk beverage has a short heating time, and the flavor and nutrient content can be well maintained. The energy consumption is also the most economical in comparison with the above three production methods. Due to the large investment in aseptic cold filling equipment, the requirements for the production environment and the factory building are relatively strict, and there is no domestic manufacturer temporarily introducing aseptic cold filling technology into the production of acidic milk beverages.
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