HDPE Hard Plactic Pelletizing Machine

Are You Facing These Challenges?

• Your raw materials contain dust, oil stains, or label residues, and you're unsure which pelletizing configuration is right for you

• You're producing pellets for injection-molded pallets, cable conduits, or similar applications, and wondering if two-stage degassing and filtration are required

• You already operate a plastic washing line, but don't know whether it can be directly connected to a pelletizing system

• You're concerned about choosing the wrong machine, not reaching your target capacity, or poor odor control in your final pellets

Boxin’s Two-Stage HDPE Pelletizing Line Is Designed to Solve These Exact Problems

We don’t just supply machines—we deliver turnkey pelletizing lines that are engineered with your material, product goals, and production challenges in mind.

What sets us apart:

• Systems tailored to handle real-world contamination levels

• Proven output for high-quality, low-odor pellets

• Engineering team focused on consistency, integration, and long-term stability

Double Stage Pelletizing Machine Process

Feeding System Transfers HDPE or mixed plastic flakes smoothly and continuously to the first-stage extruder for melting and processing. Key Features: Anti-bridging structure design prevents material clogging or buildup Auto-buffer feeding control ensures steady throughput and accommodates various material types and densities	Primary Extrusion System Performs the first-stage melting and homogenization of HDPE flakes while removing coarse impurities from the material stream. Key Features: Equipped with a high-torque screw system Custom-designed flow channel geometry optimized for HDPE material behavior Ensures stable melt pressure and consistent material feed into the secondary extruder	Vacuum Degassing Module Eliminates residual water vapor and volatile organic compounds (VOCs) from the HDPE melt to ensure low-odor, high-quality pellet output. Key Features: Dual-stage vacuum ports for enhanced degassing performance Effectively removes gases, fumes, and odors generated by contaminated materials Helps prevent yellowing, voids, and surface defects in final pellets	Dual-Station Screen Changer Intercepts solid impurities in real time to ensure stable and uninterrupted extrusion, even with contaminated HDPE feedstocks. Key Features: Hydraulic quick-change design for fast, tool-free screen replacement Non-stop operation during screen changes — no downtime, no material loss Prevents pressure fluctuations and improves melt consistency

Special Note: Custom-Engineered Extrusion Components by Boxin

All core extrusion components used in Boxin systems — including the screw, barrel, vacuum degassing unit, and die head — are independently developed and custom-designed by our in-house engineering team.

This allows us to tailor structural configurations based on specific HDPE feedstocks, such as:

Bottle-grade flakes      /     Drum and container regrind     /     Blow-molded shells and industrial scrap

Optional configurations available:

• High-precision dual-stage vacuum degassing system
   → For enhanced odor removal and volatile control

• Variable-diameter screw design
   → Improves processing of difficult-to-melt materials

• Multiple pelletizing options:
   → Strand, water ring, or underwater pelletizing to match desired pellet shape and performance requirements

How to Choose Between Single-Stage and Two-Stage Pelletizing Systems?

Both single-stage and two-stage pelletizing systems serve different application needs.

• A single-stage system is ideal for clean, low-contamination materials, where minimal filtration and degassing are required.

• A two-stage system is recommended for dirtier or more complex feedstocks, especially those containing label residues, oil contamination, or fine dust.

At Boxin, we evaluate your raw material type and quality requirements to recommend the most suitable configuration — ensuring both optimal pellet quality and production efficiency.

Quick Decision Guide:

• If your recycled material is relatively clean and free from complex contaminants, a single-stage system is a cost-effective and efficient choice.

• If your raw material quality varies significantly or you require higher-grade pellets, the two-stage system is the recommended solution.

Frequently Asked Questions

Straight Answers to the Questions You Might Be Hesitant to Ask