How does a two-stage tandem PE/PP granulation production line operate efficiently? ​

In the field of plastic processing, the two-stage tandem PE/PP granulation production line has become the first choice of many companies due to its high efficiency and stable performance. But how does it achieve efficient operation? Behind this lies a series of exquisite designs and principles. ​

The two-stage tandem PE/PP granulation production line is mainly composed of a feeding system, an upper extruder, a vacuum exhaust system, a hydraulic screen changing system, a lower extruder, a water ring pelletizing system, a dehydration system, and a wind conveying system. These components work together to complete the transformation from plastic raw materials to high-quality plastic granules. ​

The first step in the operation of the production line is feeding. The feeding system adopts an oblique deep bucket feeding method to ensure that the plastic raw materials enter the upper extruder stably and efficiently. This design effectively avoids raw material blockage and lays the foundation for the smooth progress of subsequent processes. ​

The upper extruder is one of the key links in the entire production line. It uses a specially designed screw to preliminarily plasticize the raw materials. During the high-speed rotation of the screw, the screw uses its own thread structure to push the raw material forward, and at the same time applies pressure and shear force to the raw material, so that the raw material gradually softens and melts in the barrel. In this process, the vacuum exhaust system plays an important role. Since the plastic raw material may contain moisture, air and other volatile substances, if these impurities are not discharged in time, it will affect the quality of the plastic particles. The design of the vacuum exhaust port can extract moisture and waste gas during the plasticization of the raw material, ensuring that the discharge is more stable and the rubber particles are more compact. ​

The material that has been initially plasticized by the upper-stage extruder will enter the hydraulic screen changing system. The system can quickly replace the filter screen without interrupting production, filter out impurities in the material, and ensure that the material entering the lower-stage extruder is purer. ​

The lower-stage extruder further plasticizes and extrude the material delivered by the upper-stage extruder. Compared with the upper-stage extruder, the screw speed of the lower-stage extruder is lower, but it can exert greater pressure on the material to further plasticize the material evenly, thereby obtaining a better extrusion effect.​

The materials that have been plasticized and extruded then enter the water ring pelletizing system. In this link, the rotating cutter moves synchronously with the extruded material strips to cut the material strips into uniform pellets. The pelletizer's feeding surface is all made of stainless steel and chrome-plated, with pneumatic pressing and imported material knives to ensure neat incisions and uniform pellets. ​

The freshly cut plastic pellets contain a certain amount of moisture and need to be dehydrated. The dehydration system removes moisture from the surface of the pellets through a specific mechanical structure and working method to improve the quality of the pellets. ​
The dehydrated plastic pellets are transported to the designated storage container through the air conveying system. The air conveying system uses wind power to efficiently and quickly complete the task of conveying pellets. ​

The two-stage tandem PE/PP pelletizing production line works together with various components, from feeding, plasticization, exhaust, screen changing, secondary plasticization, pelletizing, dehydration to transportation. Each link is closely linked, realizing the efficient conversion from plastic raw materials to high-quality plastic pellets. This efficient operation mode not only improves production efficiency, but also ensures product quality, bringing significant economic and social benefits to the plastic processing industry.