Dry rolling granulation mainly relies on external pressure to force the material to pass through the gap between two relatively rotating rollers and forcibly compress it into pieces. During the rolling process, the actual density of the material can be increased by 1.5 to 3 times. So as to meet the specified particle strength requirements. The dry rolling granulator can compress the powdery materials with moisture content ≤5% into flakes or blocks, and then through the process of crushing, granulating and sieving, the flake materials can be turned into granular materials that meet the requirements of use. Under normal circumstances, the subsequent drying and cooling steps can be eliminated.
The raw materials are evenly fed into the feeding hopper through a quantitative feeder. The dry extrusion type of granules making facility uses a pair of rollers with holes, leaving a gap between them, and the two rotate in opposite directions at the same speed.
One set of roll chocks does not move in the rack, while the other set of roll chocks moves upstream on the rack guide rail, and presses against each other by hydraulic cylinders.

Many holes of the same shape and size are regularly arranged on the surface of the roll, and the troughs are aligned with the troughs. At this time, the dry powder material enters the double roller granulator of extrusion craft continuously and uniformly from the top of the two rolls by its own weight and forced feeding. The material flows freely first, and then is gradually bitten into the trough by the rolls after entering the biting area.
With the continuous rotation of the roll, the space occupied by the material gradually decreases and is gradually compressed, and reaches the molding pressure value.
Then the pressure is gradually reduced, and the pressed blocks fall off the holes due to elastic recovery and their own weight, and enter the crushing and sieving device. The finished product is a granular qualified product and is weighed and packaged.
The fine powder and unqualified particles from the powder feed port are re-entered into the feed port of the hoist by the return auger and mixed with fresh materials into the pre-feeding hopper to enter the next round of the process flow. When you require to know more information about the double roller granulating equipment, you can visit the following link.
https://www.fertilizerfactorymachine.com/double-roller-granulator/










