What is vacuum drying?

Vacuum drying equipment eliminates the need for workers to wear protective clothing.

Vacuum drying is a process in which materials are dried in a reduced pressure environment, which reduces the heat required for rapid drying. It doesn’t take place in a true vacuum, despite the name. The devices used for this process are known as vacuum dryers and can range in size from small units designed to fit under kitchen counters to huge rooms that are used to handle things like wood products.

Drying involves reducing the moisture in an object and is done in environments where the air is drier than the object being dried, which causes the moisture to evaporate. This is usually done with heat to reduce the humidity in the air, but in a vacuum dryer, the temperature doesn’t need to be as high and drying is usually faster. It is also possible to achieve a very high level of dryness, which may be desirable in some cases.

An advantage of vacuum drying is that it conserves energy. Less energy is required for drying, reducing the economic and environmental costs associated with drying a product for storage, sale or other purposes. This process also tends to work faster than other drying methods, reducing processing time, which can be important in some facilities where products are moved quickly.

Another advantage of drying materials in this way is a less harmful drying process. Some materials may have problems at high temperatures, such as the development of hard, leathery crusts due to exposure to heat during the drying process. Vacuum drying tends to retain the integrity of the original item without heat damage. For food, this can be valuable as other drying processes can degrade the quality and make the food less appealing.

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The use of vacuum drying equipment also reduces risks to workers. With other types of drying equipment, vapors and particles are expelled that can make people sick or force people to wear protective clothing. With a vacuum dryer, ventilation does not occur and workers around the dryer are safer. It is also possible to recover the precipitated moisture collected during drying for later use or study.

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