Industry Info

Principle and operation advantages of roller press granulator

The roller press granulator is commonly used fertilizer equipment in the NPK fertilizer production line. It uses powder granulation technology to adopt dry and wet granulation. The roller extrusion granulator has a wide range of raw materials and is suitable for granulation of various raw materials such as compound fertilizers, medicines, chemicals, feeds, etc. The product has a high granulation rate. In the development of compound fertilizer production, the development of roll extrusion granulators can be said to be very promising. Here we come to understand its working principles and advantages.


Generally speaking, there are two types of powder granulation technology: dry granulation and wet granulation. Like the roller press granulator, dry granulation is adopted. When the material is not sticky, it is extruded into pellets or tablets. , Then crushed and sieved into granular products. In contrast to wet granulation, there are mainly drum granulators and disc granulators, which have been introduced before and will not be described in detail here.

With the continuous development of granulation technology, binderless extrusion granulation technology is a very competitive technology. Generally, particles are not formed by solid bridges between particles, but by the strength of particles formed by the force between molecules.
Due to the short distance of this force, the size of the particles is required to be similar, and external pressure is required. The pressure can be by extrusion (using a fixed diameter hole pressure material) or extrusion method, that is, pressing on both sides of the material. To granulate, so what are the operating advantages of the roller extrusion granulator? Mainly reflected in 3 points:
1. The use of a pair of roller extrusion granulators can reduce dust pollution and improve labor operating conditions.

2. The use of double-roll extrusion granulators to meet production process requirements, such as increasing porosity and specific surface area, improving heat transfer, etc.

3. Improve the physical properties of the product to avoid the adverse effects of segregation, pulsation, agglomeration, and bridging of materials during subsequent use, and improve the granulation efficiency of materials.