A typical pasteurizer is completely automatic. You pour milk in one end and it flows between a set of heating pipes or plates for a set period of time (long enough to kill off most of the harmful bacteria), then between a set of cooling pipes, before emerging from an outlet pipe into the bottles.

How does the pasteurization process work?

Pasteurisation makes sure milk is safe to drink (by killing any bacteria) and also helps to prolong its shelf life. The process of pasteurisation involves heating milk to 71.7°C for at least 15 seconds (and no more than 25 seconds). ... Once the milk has been heated, it is then cooled very quickly to less than 3°C.

How does a flash pasteurizer work?

With flash pasteurization, the beer undergoes a special process called the thermal bypass system. ... The beer flows one way in one pipe, and heated water or steam flows the other way in the other pipe. As they pass each other, the beer's temperature goes up. It then runs through a heat exchanger and is cooled.