Drying occurs in multiple constant rate periods due to periodic bursting of successive layers of foam bubbles, thus exposing new surfaces for heat and mass transfer as the drying progresses
This method is suitable for any heat sensitive, sticky and viscous materials which cannot be dried by spray drying
The foam-mat dried products has better reconstitution properties because of its honeycomb structure and is superior to drum and spray dried products
Foaming of liquid and semisolid materials has long been recognized as one of the efficient methods to shorten drying time
In the recent years, foam mat drying technology has revamped and renewed attention for its added ability to process hard-to-dry materials to produce products of desired properties , retaining its volatiles that otherwise would be lost during the drying of non foamed materials