Patent ID: 8590818

Claim:
A dry granulation apparatus for producing granules from a powdered bulk, comprising compacting means capable of producing compaction and granulation and fractioning means adapted to separate fine particles from acceptable granules by entraining the fine particles in a gas stream, wherein: the gas stream is entering into the apparatus from one aperture ( 4 ) located in the upper part of a compaction chamber ( 3 ), and is dragged through a granulator ( 5 ) to a fractioning device ( 12 ) wherein the separation of the acceptable granules from the fine particle happens; said fractioning device ( 12 ) is connected in an upper part to a pipe line where the fine particles are entrained in the carrier gas stream and conveyed to a filterless cyclone ( 11 ) together with the powdered bulk to be granulated coming from a feed bin ( 1 ), while the acceptable granules are collected in a bin ( 6 ), avoiding that air or other gas comes from outside the fractioning device when collecting the acceptable granules; said filterless cyclone ( 11 ), where a vortex drags the powdered bulk and the fine particles into an expansion bin ( 8 ) lying below, is connected in his upper part to a fan ( 15 ) which creates said gas stream, through a security filter system ( 8 A), where the gas much lighter than the powders is cleaned up from possible residual powders, the bottom of said expansion bin ( 8 ) is connected with a vessel ( 10 ) from which the material to be compacted flow down to a feeder box from where it is pushed forward to enter the compaction chamber ( 3 ) where rolls compress the bulk into ribbons, there by obtaining that the bulk to be compacted from ( 1 ), and the fine particles to be compacted again have the same flow direction as the carrier gas stream and the total quantity of gas coming inside the apparatus during the process can be strictly controlled.