High-Efficiency HDPE Rigid Plastic Pelletizing Line: 300–500 KG/HR Complete Recycling Guide

Categories Videos Posted on Author Andrew Cheng

As global demand for high-quality recycled plastic continues to surge, manufacturing clean, uniform recycled High-Density Polyethylene (HDPE) pellets has become a cornerstone of sustainable plastic production. Converting crushed HDPE rigid flakes—sourced from bottles, containers, pipe scrap, and industrial regrind—into premium re-granule pellets requires stable extrusion, melt filtration, and precise pelletizing technology.

Our 300–500 kg/hr Plastic HDPE Rigid Pelletizing Line offers an automated, energy-efficient solution designed specifically for recycling regrind and rigid flakes into clean, re-usable plastic raw materials.

Why Processing HDPE Rigid Flakes Requires Specialized Extrusion

HDPE rigid plastics (such as blow-molded bottles, heavy-duty crates, and thick pipes) exhibit unique flow characteristics and melt temperatures compared to flexible films. Key challenges in processing rigid HDPE flakes include:

  1. Feeding Consistency: Flakes and regrind can vary in bulk density, leading to unstable feeding in standard extruders.
  2. Impurity Contamination: Residual contaminants and non-melt materials must be efficiently filtered out without stopping production.
  3. Pellet Uniformity: Irregular pellet sizes affect downstream injection molding and blow molding processes.

An optimized HDPE pelletizing system combines automated volumetric/force feeding, continuous melt filtration, and a dedicated water-ring cutting system to ensure consistent pellet output.

Step-by-Step Breakdown of the HDPE Pelletizing Process

Our complete 300–500 kg/hr HDPE rigid plastic pelletizing machine operates as an automated, continuous line to deliver high-density, uniform pellets.

+------------------+      +-------------------+      +-----------------------+
|  Screw Conveyor  | ---> |  Automatic Feeder | ---> | 100 mm Single-Screw   |
|  (Raw Regrind)   |      | (Dosing System)   |      | Extruder (L/D 30:1)   |
+------------------+      +-------------------+      +-----------------------+
                                                                 |
                                                                 v
+------------------+      +-------------------+      +-----------------------+
| Transit Storage  | <--- | Water-Ring Cutting| <--- | Hydraulic Non-Stop    |
| Silo / Packing   |      | & Cooling System  |      | Screen Changer        |
+------------------+      +-------------------+      +-----------------------+

1. Automated Feeding & Conveying

  • Screw Conveyor & Automatic Feeder: Clean HDPE rigid flakes are automatically conveyed into the main feed hopper. The continuous dosing mechanism prevents feeding surges and ensures a constant material volume enters the screw barrel.

2. Homogeneous Plasticization & Degassing

  • 100 mm Single-Screw Extruder (L/D 30:1): The heavy-duty single-screw extruder features precise multi-zone temperature controls. With an optimized L/D ratio of 30:1, the material achieves complete plasticization, thorough melting, and uniform melt pressure while preserving the physical properties of the HDPE polymer.

3. Continuous Melt Filtration

  • Hydraulic Screen Changer: Before the molten plastic reaches the die head, it passes through a hydraulic screen changer. This system filters out microscopic impurities and solid particles without interrupting continuous extrusion.

4. Water-Ring Pelletizing & Cooling

  • Water-Ring Cutting System: The filtered melt is extruded through a circular die face where rotating blades slice the molten streams into precise pellets. The hot pellets immediately enter a high-velocity water ring for instant cooling, preventing agglomeration.
  • Drying & Silo Storage: The water-pellet mixture passes through a centrifugal dewatering dryer to strip away surface moisture before pneumatic transport to the storage silo for packaging.

Core Equipment Components & Technical Specifications

Equipment ComponentTechnical Function & Specification
Material IntakeHeavy-Duty Screw Conveyor & Automatic Feeder
Main Extruder100 mm Single-Screw Extruder (L/D Ratio 30:1)
Melt FiltrationHigh-Pressure Hydraulic Plate / Piston Screen Changer
Pelletizing UnitDie-Face Water-Ring Cutting System
Cooling & DryingStainless Steel Water Channel & Centrifugal Dewatering Machine
System ControlCentralized Electrical Control Cabinet (PLC / Inverter Drive)
Processing Capacity300 – 500 kg/hr (depending on flake bulk density)
Applicable MaterialsCrushed HDPE containers, rigid flakes, bottles, pipe regrind

Key Benefits for Plastic Recycling Operations

  • Stable Extrusion Performance: Designed with a 300–500 kg/hr capacity, the line maintains stable melt pressure and throughput across long production runs.
  • Exceptional Pellet Quality: Water-ring face cutting yields smooth, cylindrical, high-density pellets ideal for extrusion, injection molding, or blow molding applications.
  • Low Labor & High Automation: Automated feeding, continuous screen changing, and pneumatic pellet conveyance enable operation with minimal staff supervision.
  • Energy-Efficient Heating & Drives: High-efficiency heating bands and variable frequency drives reduce overall kilowatt consumption per ton of recycled plastic produced.

Upgrade Your HDPE Recycling Line Today

Whether you are expanding your post-consumer washing and pelletizing plant or processing internal post-industrial scrap, our 300–500 kg/hr HDPE Rigid Pelletizing Line delivers the durability, output quality, and operational reliability your facility needs.

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