What are the differences between rod granulators?

Differences between single screw granulator and twin screw granulator

According to the number of extruder screws, plastic extruders can be divided into single screw granulator, twin-screw granulator and multi screw extruder. Now single screw granulator is widely used, suitable for extrusion production and processing of general information. The twin-screw granulator has the advantages of less heat generated by collision, more uniform shearing of materials, larger conveying capacity of extruder screw, more stable extrusion capacity, long stay of materials in the barrel and even mixing. The conical twin-screw granulator has the characteristics of forced extrusion, high quality, wide adaptability, long service life, low shear rate, difficult material differentiation, good plasticizing performance of rubber mixture, direct molding of granular materials, temperature control, vacuum exhaust pipe and other equipment. It is suitable for the production of pipes, plates, profiled materials and other products. Single screw granulator plays an important role in both plastic processing machinery and molding processing machinery. In recent years, single screw granulator has a great development trend. Now the large and medium-sized single screw granulator for plastic processing is produced in Germany. The screw diameter of the extruder is 700mm and the output value is 36t / h. The important indication of the development trend of single screw granulator depends on the development trend of extruder screw. In recent years, we have done a lot of theoretical and Experimental Research on the extruder screw. Up to now, there are nearly 100 kinds of extruder screw, including separate type, shear type, natural barrier type, separate type and wavy type. From the development trend of single screw granulator, although the single screw granulator has been relatively perfect in recent years, with the continuous development trend of fiber materials and plastic products, new extruder screw and special single screw granulator with more characteristics will continue to emerge. In general, the single screw granulator is developing towards high speed, high energy and specialization. Twin screw granulator has good feeding characteristics, which is suitable for the production and processing of granular materials, and has better mixing, exhaust pipe, reflection and self-cleaning functions than single screw granulator. Its characteristics are that it has more advantages in producing and processing plastics and blends with poor heat resistance. In recent years, overseas twin-screw extruders have already had a great development trend. A variety of twin-screw granulators have been popularized and technicalized, and many manufacturers have produced them. They are roughly classified as follows:

(1) According to the relative position of the two center lines, there are parallel plane and cone type;

(2) According to the meshing program of two extruder screws, there are meshing type and non meshing type;

(3) According to the rolling direction of the two extruder screws, there are the same direction and different direction, and there are inward and outward in different direction;

(4) According to the rolling speed of extruder screw, there are high speed and low speed;

(5) According to the structure of extruder screw and barrel, there are integration and composition.

Single screw granulator