Plastic extruders can be divided into single screw plastic pelletizer, twin screw plastic pelletizer and multi-screw extruders according to the number of extruder screws.

single screw plastic pelletizer

At present, the single-screw plastic pelletizer is the most widely used and is suitable for general material extrusion production and processing. Twin-screw plastic pelletizer has less heat generated by friction, the material is sheared more uniformly, the conveying capacity of the extruder screw is larger, the extrusion volume is more stable, the material stays in the barrel for a long time, and the mixing is uniform.

twin-screw plastic pelletizer

Conical twin-screw plastic pelletizer has the characteristics of forced extrusion, high quality, wide adaptability, long life, small shear rate, the material is not easy to decompose, the good plasticizing performance of mixing rubber, direct molding of granular material, temperature self-control, vacuum exhaust pipe and other devices. Applicable to the production and manufacture of products such as tubes, plates and shaped materials. Single-screw plastic pelletizer whether plasticizing plastic processing machinery or molding processing machinery occupies an important position in recent years, the industry, the single-screw pelletizing machine has been a pretty big development trend.

The current production and manufacturing of large and medium-sized plastic processing with a single-screw pelletizer, extruder screw diameter of 700mm, and an output of 36t / h. Single-screw pelletizer development trend depends on the development trend of its important components extruder screw. In recent years to date, we have conducted a lot of theoretical and experimental research on the extruder screw, so far there are nearly 100 kinds of the extruder screw, the prevalent separation out type, shear type, natural barrier type, separation type and corrugated type, etc.

From the single-screw plastic pelletizer development trend, although in recent years the single-screw plastic pelletizer has been more perfect, with the fiber materials and plastic products continue to develop, will continue to emerge with more characteristics of the new extruder screw and special single-screw pelletizing machine. In general, the single-screw pelletizer is developing towards high speed, high efficiency and specialization. Twin-screw plastic pelletizer feeding characteristics, suitable for granular material production and processing, and better than the single-screw pelletizer mixing rubber, exhaust, reflecting and self-cleaning role, the characteristics of the production and processing of heat-resistant plastic and co-mingled material more show its superiority.

In recent years overseas twin-screw extruder has long had quite a big development trend, a variety of ways of twin-screw pelletizer has been generalized and technical, production and manufacturing manufacturers are also more, probably categorized as follows.

(1) according to the two centerline relativity parts, there are parallel surface and cone types.

(2) According to the two extruder screw engagement procedures, there are engaged and non-engaged types.

(3) according to the two extruder screw rotation orientation, there are the same direction and anisotropy, and in the anisotropy, there are inward and outward.

(4) according to the extruder screw rotation rate, there is high-speed and low-speed gears.

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