The agglomeration process has been developed as a
solidifying process for liquids. A (or more) powdery adsorbent (for example:
sugar, starch) is used as a carrier and saturated by the liquid. The final
granules integrate spray-dry components from the liquid and the carrier powder.
Because a considerable volume of liquid must be evaporated, the drying
efficiency of the processor should be high. Vanguard recommends two series fluid
beds VFL and VPL for this process.
VFL and VPL have been
successfully applied to make the granules of all types of natural herbs and
herbal formulas. It is even great for making granules with more than ten different
herbs in a single formula. The
herbal fluid extracts are viscous and difficult to be dried. Comparing with the
traditional wet-granulation process, the high efficient and potent of VFL and
VPL processes save energy, time and reduce the quantity of the excipient significantly.
Agglomeration is the
first technologic innovation developed from the original fluid bed dryer.
Vanguard offers two types top spray systems - VPL and VFL. The powder is
charged in the container of the fluid bed and fluidized by the hot air. The
binding liquid such as solution, suspension is sprayed on the fluidized powder
to build liquid bridges among them. The liquid bridges are dried by the hot
fluid air to stick the powder together. While the liquid sprayed continuously,
the particles grow bigger to a desire grain size.