Why is Overpressure Important in Retort Packaging?

Why is Overpressure Important in Retort Packaging?

If overpressure isn’t introduced to the retort package during cooling, pressure can drop. This can lead to a vacuum in the retort, which can be very problematic. If a vacuum is created, the pressure between the outside environment and what’s present in the chamber can become too significant and the end result is often a damaged product or package. It’s a big part of the reason why overpressure must be very carefully controlled during the initial cooling stage. Failure to do so could cause product buckling or crushing.