Retort Application in Package Food Field
In the simplest terms, the retort is a closed, pressurized heater that heats the food sealed in the container. A variety of different sterilization pot systems can be used for foods that are packaged and packaged in a container for commercial aseptic sterilization. The retort system has some of the same characteristics:
The system is pressurized and the transfer temperature is much higher than boiling water.
The system uses a medium (called a heating medium or a sterilizing medium) as a means of transferring heat to the product. The medium used in the pan includes pure steam, hot water (the container is completely submerged in water, water spray or water spray) and a steam/air mixture.
Some systems use overpressure during sterilization and cooling to maintain the integrity and balance of the vessel to counteract the pressure inside the tank. This is necessary because some packaging containers have limited tolerance to internal pressure. Some examples of overpressure sterilization containers are semi-rigid plastic containers with heat-sealed or bimetallic seamed can ends, soft bag bags, metal plates, cardboard containers, and glass cans. The pressure at 250 °F is approximately 15 psig, and any pressure applied to the sterilizer that exceeds the 15 psig is referred to as overpressure. An overpressure system, such as a 25-35 psig sterilization system, can be operated at higher temperatures.
The operation of the sterilizer must be appropriate to ensure that the container is sterilized for commercial sterility.