Mitchell vacuum
dryers are used where materials to be dried are heat
sensitive or liable to oxidation. Solvents can readily be
recovered by means of a simple condenser system. Toxic
materials can be processed without operator contact.
These dryers can be supplied complete with heating
system, vacuum pump, solvent condensor and service
piping.
Vacuum Shelf Dryer
This is the
simplest type of unit with the wet material carried on
trays which are placed onto heating platens within the
vacuum chamber. High efficiency heating platens in direct
contact with the total tray surface ensure maximum heat
transfer and even drying. Circular or rectangular units
can be supplied and these are ideal for small to moderate
levels of production. Sizes range from 1.25m˛ up to
19m˛ tray area.
Agitated Pan Dryer
This is the
most versatile of the vacuum dryers capable of taking
feed materials in either liquid, paste or powder form.
The cylindrical vessel is jacketed for steam, hot water
or oil and is fitted with an internal agitator to
facilitate drying and discharge of the dry powder. These
units can be used atmospherically as well as under vacuum
and are available with a feed capacity from 75 to 2135
litres.
Double Cone Dryer
The material to
be dried is tumbled in a slow rotating vessel of double
cone construction which is jacketed for steam, hot water
or oil heating. As the dryer rotates the rapid and
thorough intermixing of the entire batch brings every
particle in contact with the heated metal. These dryers
are suitable for damp powders or granules handling batch
charges from 28 to 10,500 litres.
Vacuum Band Dryer
Vacuum band
dryers provide a continuous means of handling heat
sensitive materials which can be fed as a viscous liquid
or paste. The band dryer comprises a vacuum chamber
housing a number of conveyor bands which pass over
platens heated by steam or hot water. These units are
supplied with a range of capacities using single to ten
band configurations. Typical applications; soluble
beverages, extracts, enzymes and pharmaceutical products.