Comparison Of Hot Filling And Aseptic Cold Filling

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There are many packaging forms for liquid foods, including glass bottles, metal cans, composite flexible packaging, and PET packaging. At present, the most popular packaging method is PET bottle packaging. The following is a simple comparison between PET hot filling technology and aseptic cold filling technology.

1. Production process comparison

From the comparison of packaging materials, the requirements for PET bottles in the two filling methods are different. Hot filling requires PET bottles to withstand high temperatures of 85 ° C ~ 92 ° C and maintain good heat resistance, so the PET bottle wall used is thicker, the bottle wall ribs have thermal shrinkage prevention, but this also greatly limits the bottle design The degree of freedom, and the price of heat-resistant PET bottles and caps is higher. The aseptic cold filling can use ordinary lightweight bottles (up to 60 ° C to 70 ° C) and standard cover, which greatly reduces the cost of the bottle and lid, in addition to the ordinary bottle can also freely choose the design bottle type.

In terms of process flow, the hot filling technology does not need to separately sterilize the bottle and the cap before filling, but after the filling, the bottle pouring process is carried out, and the cap of the product is sterilized by the heat of the product. For medium-temperature hot filling, subsequent pasteurization is required. Aseptic cold filling technology sterilizes products, bottles, caps and filling equipment before sterilization to achieve sterility. Since ordinary PET bottles and caps are not heat-resistant, they need to be sterilized with chemical reagents. To ensure that the bottles and lids are effectively sterilized, and chemical agents are not allowed to affect the materials, the following measures are generally adopted for aseptic filling techniques: a) the number of original colonies of the blown bottles does not exceed 5 cf/bottle; b) Bacterial air transport bottle; c) disinfection of the inside and outside of the bottle at the same time; d) automatic recovery and concentration measurement system for disinfectant to ensure stable concentration of disinfectant; e) disinfectant remaining in the bottle with sterile water Rinse thoroughly and then dry with sterile air; f) Since the PET bottle will not shrink after cold filling, there will be some air between the material and the cap, and the oxygen will slowly dissolve the oxide during storage. Causes the beverage to deteriorate. Therefore, the aseptic cold filling equipment will add a nitrogen (or other inert gas) replacement system to blow off the air at the top to ensure that the material is not oxidized.

In terms of production management, the aseptic cold canning technology is very high, and it requires a high level of technical personnel and high-quality management personnel for unified management. Generally, the HACCP management system is applied. All management must form a document system, and there is special personnel responsible for implementation. The environment of the aseptic cold tank workshop is also strictly controlled. The filling area has reached 100-level purification, and the filling line and the pre-filling line have reached 10,000-level purification. At the same time, when the operator enters the 10,000-level purification room, it must be spray-sterilized to reduce man-made pollution.

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