UHT thermal process is based in the application of high temperature in a short time (at least, 140°C in a few seconds).
There are several ways to do this treatment:
• Direct systems: the product to be sterilized is in direct contact with the fluid used to sterilize.
• Indirect systems: heat is transferred through an exchange surface, and there is no direct contact between both fluids.
• Mixed systems: It is a mix of the above mentioned systems.
After UHT process, products are cooled and aseptic packaged.