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Circulating Air Drying Ovens

Many industries, including in particular the pharmaceutical, food, and chemical industries, require a Powder Drier. There are a wide variety of means of achieving this either through a Vacuum Tray Drier, Chemical Drier, Conical Drier, or Fluid Bed Drier. Whatever your specific requirements there is a Powder Dryer to suit your purposes.

For drying of product under normal atmospheric pressure as well as heating, tempering and sterilisation, PINK offers a series of circulating air drying ovens in different versions and product tray quantities.

There are a number of equipment classes which can be used as a Chemical Dryer. Foremost amongst these (and available from Powder Technology Ltd) are the Fluid Bed Drier and Vacuum Tray Dryer.

Charging of the ovens can be accomplished very easily using charging carts. Temperature resistant HEPA filters can be used, when particular requirements for cleanliness are placed on the circulating air.

Standard versions of the Circulating Air Oven are available as detailed below:-

Version	Circulating Air tempering oven, e.g. barrel heating oven; Circulating air drying oven; Circulating air drying oven e.g. gas-tight version; Clean room drying oven; Sterilisers; Clean room sterilisers.
Temperature Range	150°C or 250°C Higher temperatures on request.
Heating Medium	Electric Hot water / thermal oil Steam
Explosion Proof Version	Suitable for installation and operation in zone 1, ATEX zone 20

Circulating Air Drying oven with External Solvent Recovery System

Vacuum processes are normally used to dry products containing solvents or water-based moisture. However, as not all products are suitable for drying in a vacuum, a new forced-air dryer with a very high solvent recovery rate has been developed by PINK for use at atmospheric pressure.

In contrast to other designs, external recovery allows you to condense, collect and dispose of solvents even if they are potentially explosive.

As with all PINK Circulating Air Drying ovens, a transfer cart containing the product trays can be used for the easy loading of the oven. After loading has been completed, the internal chamber of the oven is purged with inert gas until the explosive concentration falls below the ignition point. The fans and heater are then turned on, and the drying process starts.

The gas atmosphere that now contains solvents can be fed to the external condenser in partial flow mode. The condensed vapour is collected in a demister unit and moved to a secure container. Because the system uses a closed cycle, the remaining partial flow is returned to the system.