DH series dry roll press granulator adopts dry rolling technology to compress the powdery materials with moisture
content ≤ 5% into pieces or tablets, then going through the processes of breaking into granules and screening to
make the lump materials into granules that meet the requirements of application. Dry roll press granulator mainly
depends on the manner of external pressure to force the material going through the gap between two relatively
turning rollers to compress into laminar particles. During course of roller pressing, the real density of materials can
increase 1.5~3 times thus reaching certain demands of granular strength.
Raw materials are sent into hopper by quantitative feeder , compactors use the pair of roller with the hole roll,
leaving certain gap and rotation with the same speed reversely. Shaft holders of one group of rolls are fixed, and
the other one of group can slide to help the hydraulic cylinder press the rolls for abutting closely against each other
. Many arc grooves with the same shape and size are arrayed regularly on the roll surface. In accordance with
different compressing ratios of target materials, the wave trough of arc groove of one roll shall be directed at that
of one roll. When two rolls parallel each other horizontally, powder grained materials are, continuously and evenly
fed in the gap between two rolls by means of their gravities and through a forced charger from above of two rolls.
After entering the nip area, the materials are gradually nipped by the rolls. With continuous rotation of the rolls, the
space that the materials occupy reduces gradually and is compressed step by step and reaches the maximum
shaping pressure. And then, as the pressure reduces gradually later, pressed blocks drop off the arc grooves
of the rolls for recovered elasticity and gravity of the flaking machine and enter a crushing device for crushing
and then enter a sieving device for sieving. At last, grained products are obtained. The powder materials and
large particles which are substandard will return to bucket elevator and enter into the next process with new
products.