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Principles and Methods of Food Preservation

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Summary

Thermal processing:
Thermal processing is defined as the combination of temperature and time required to eliminate a
desired number of microorganisms from a food product.

Industrial freezers:
The rate at which heat is removed from a food during freezing depends on how fast heat can
travel within the food and how efficiently it can be liberated from the surface of the food into the
surrounding atmosphere. Industrial freezers remove heat from the surface of a food as rapidly as
possible. There are several types of industrial freezers, including air-blast tunnel freezers, belt
freezers, fluidized-bed freezers, plate freezers, and cryogenic freezers.
In air-blast tunnel freezers and belt freezers, precooled air at approximately -40 °C is blown over
the food products. Packaged foods, such as fruits, vegetables, bakery goods, poultry, meats, and
prepared meals, are usually frozen in air-blast tunnels. The packages are placed onto dollies or
hand trucks and then rolled into the freezer tunnels. In a belt freezer, food is placed on a
conveyor belt that moves through a freezing zone. Bakery goods, chicken parts, and meat patties
are frozen using a belt freezer.
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