PP HDPE Rigid Plastic Flake Pelletizing System

Advanced PP and HDPE rigid plastic flake pelletizing system in an industrial facility, featuring a blue and white color scheme with multiple modules and control mechanisms.

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 SizeMotor Power (Compactor)Diameter of Screw (mm)L/DMotor Power (Extruder)Throughput Rate (kg/h)
SJ8037 kW803645/55 kW160-220
SJ10055 kW1003690/110 kW300-380
SJ12090 kW12036132 kW450-480
SJ140110 kW14036160/185 kW500-650
SJ160132 kW16034220/250 kW800-1000
SJ180315 kW18034315 kW1000-1200

Additional Images

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Author: Rumtoo Plastic Recycling Machine

Rumtoo Plastic Recycling Machinery, Rumtoo Recycling for short, the leading manufacturer of high quality PET Bottle、PP / PE Film Recycling Machinery. Our PE film washing lines offer reliability, efficiency and maximum durability in recycling dirty and soiled PET bottle、PE film back into plastic granulate. With more than two decades of service to the plastics recycling industry, Rumtoo is proud to be responsible for recycling thousands of tonnes of plastic films such as plastic bags, PP non-woven supersacks and LDPE film every month at hundreds of recycling facilities worldwide.

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