PP HDPE Rigid Plastic Flake Pelletizing System

This two-stage HDPE flakes pelletizing system consists of two sets of single screw extruders and integrates the function of feeding, plasticization, and pelletizing into a single step. The final product generated by this pelletizing machine are high-grade pellets/granules (see additional images below) that can be directly put into plastic injection machines or other applications.

Working Principle

Feeding: The flakes are fed into the extruders by screw conveyors that are managed by VFD. The VFD feeding system halts automatically when the electric current in the extruder is elevated and will only resume when the electrical current returns to standard parameters.

Plasticization and degassing: A specialized single-screw extruder delicately melts the pre-compacted material. The plastic scraps are melted and plasticized in the first-stage extruder and then extruded by the second-stage extruder. With this “dual-zone” vacuum degassing system, volatiles such as low molecular weight substances and moisture are effectively removed. This results in more consistent final products.

Melt filtration: This system utilizes segmented filtration. The first extruder is tasked with removing coarse contaminants via pre-filtration. A high mesh filter is then applied to the second extruder to eliminate fine particles. This lowers the frequency for changing filtration media and sieves.

Pelletizing: To convert the extruded plastic into granules, a standard die-face water ring pelletizing system is employed. Once the pellets are formed, an advanced dewatering vibration sieve is paired with a horizontal-type centrifugal dewatering machine to dry the pellets for storage.

Technical Specifications

Machine Size	Motor Power (Compactor)	Diameter of Screw (mm)	L/D	Motor Power (Extruder)	Throughput Rate (kg/h)
SJ80	37 kW	80	36	45/55 kW	160-220
SJ100	55 kW	100	36	90/110 kW	300-380
SJ120	90 kW	120	36	132 kW	450-480
SJ140	110 kW	140	36	160/185 kW	500-650
SJ160	132 kW	160	34	220/250 kW	800-1000
SJ180	315 kW	180	34	315 kW	1000-1200

Additional Images

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