In a vacuum tumbler dryer, wet
particulate matter can be dried by indirect heat transfer to the material
while the material is in a gentle rolling and folding motion due to gravity.
These tumbler dryers have the potential to produce a finally dry mix rather
than dry cake. Drying occurs at a reasonable rate at relatively low temp.
The jacket temp can range upto 300°C while the vacuum in the dryer can
be as low as 1m bar. The batch usually occupying upto 60% at the dryer
volume. Drying cycles upto 20 hr.
Pharmaceutical Products
Sterilization of powders
» VERTICAL THIN FILM DRYER (VTFD)
This equipment has originated from the
thin film evaporator that was used to concentrate solutions. The design is
sturdy and can convert solutions to pastes and powders.
Due to the presence of agitator the product moves in a spiral shaped path
along the wall. The agitators have a huge halfway between the shaft and the
wall, this safe guard against damage..