An alternative to flash pasteurization and sterile filtration is tunnel pasteurization. Tunnel pasteurization is employed after bottles have been filled and crowned. The bottles are loaded at one end of the pasteurizer and passed under sprays of water as they move along the conveyor. The sprays are so arranged that the bottles are subjected to increasingly hot water until the pasteurization temperature is reached by the beer in the bottles (16). The bottles are then gradually cooled with water until they are discharged from the end of the pasteurizer.
Advantages and Disadvantages
Tunnel pasteurization, although reliable and simple to operate, is an expensive method of ensuring microbiological stability.
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