Underwater Pelletizing Line

Underwater Pelletizing Line

Underwater Pelletizing Line

The Underwater Pelletizing Line efficiently converts molten polymers into uniform, high-quality pellets using a water bath cutting process. Ideal for recycling, compounding, masterbatch production, and polymer modification, it ensures stable output, precise pellet size, and low dust operation.

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Description

The Underwater Pelletizing Line is a high-efficiency system designed to convert molten polymers into uniform, high-quality pellets directly in water. This line is widely used in recycling plants, compounding facilities, masterbatch production, and polymer modification industries.

By integrating precise extrusion, underwater cutting, and immediate pellet cooling, the system guarantees excellent pellet shape, consistent size, and high throughput. It is ideal for manufacturers seeking reliable, continuous, and efficient pellet production.

System Overview

The line operates by extruding molten polymer through a die head and cutting the strands underwater immediately after extrusion. The underwater environment ensures rapid cooling, high pellet quality, and minimal surface defects.

Its modular design allows customization according to material type, production capacity, and application requirements. The line is compatible with a wide range of polymers including PP, PE, PET, ABS, PS, and engineering plastics.

Key Components

Extruder Unit

High-efficiency extruder ensures stable melting, homogenization, and pressurization of the polymer. Suitable for various polymers including recycled materials.

Die Head & Strand Formation

Precision die head forms strands with uniform diameter. Multi-hole design increases throughput and maintains consistency.

Underwater Cutting Unit

Strands are cut into pellets directly in water using a high-speed underwater pelletizer.

  • Immediate cooling
  • Smooth, uniform pellets
  • Low dust and minimal fines

Water Cooling & Conveying System

Cooled pellets are transported via water flow to the separation and drying units. Adjustable water flow ensures optimal pellet quality.

Pellet Drying & Dewatering Unit

Pellets are separated from water, dewatered, and dried using centrifugal dryers or hot air systems to achieve stable moisture content.

Control & Automation System

PLC-based control system with touch screen interface monitors extrusion, pelletizer speed, water flow, and safety functions.

Advantages of the Underwater Pelletizing Line

  • High Pellet Quality: Uniform, smooth, and precise size
  • Wide Material Compatibility: Supports PP, PE, PET, ABS, PS, and other engineering plastics
  • Stable Continuous Operation: Designed for industrial 24/7 use
  • Low Dust & Environmental Safety: Underwater cutting minimizes dust and emissions
  • Flexible Production Capacity: Modular design allows easy scaling and customization
  • Easy Operation & Automation: PLC control ensures efficient monitoring and minimal operator intervention

Typical Industrial Applications

  • Recycling of plastic flakes and regrind
  • Compounding plants
  • Masterbatch production
  • Polymer modification factories
  • Sheet, film, and pipe manufacturers
  • Injection molding material supply

Products

The Underwater Pelletizing Line is widely used in industries that require high-quality plastic pellets with uniform size and smooth surface. Its high throughput and reliable operation make it suitable for a variety of applications, including:

Recycling Industries

Used to convert washed or regrind plastic flakes into high-quality pellets suitable for resale or further processing.

Compounding Plants

Ideal for producing customized polymer compounds with additives, fillers, colorants, stabilizers, or reinforcement materials.

Masterbatch Production

Commonly used for producing color masterbatches and additive concentrates for extrusion and injection molding applications.

Polymer Modification

Suitable for reactive extrusion processes to improve polymer properties such as viscosity, flexibility, mechanical strength, and thermal stability.

Film Production

Prepares high-quality pellets for blown film, cast film, stretch film, agricultural films, and packaging films.

Sheet and Panel Extrusion

Provides a reliable feedstock for thermoforming sheets, construction panels, and industrial sheets.

Pipe and Profile Extrusion

Used in the production of water pipes, cable ducts, electrical conduits, window profiles, and other structural plastic profiles.

Injection Molding

Supplies pellets for a wide range of molded products, including automotive parts, electronic housings, household appliances, toys, and industrial components.

3D Printing Filament Production

Recycled pellets can be used for producing filaments suitable for FDM-type 3D printers.

General Plastic Manufacturing

Applicable in factories producing containers, packaging materials, home appliances, consumer goods, and engineering plastic parts.

Applications

Gallery

Main Features

Item Specification
Applicable Materials PP, PE, PET, ABS, PS, engineering plastics
Cooling Method Water bath (underwater)
Cutting System Underwater pelletizer
Pellet Size 2–5 mm (adjustable)
Drying System Centrifugal dryer / Hot air dryer
Power Supply 380V / 50Hz (customizable)
Control System PLC + Touch screen
Automation Level Semi / Fully automatic

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