Twin-Screw Extruder Pelletizer

The twin-screw extruder pelletizer is the core equipment for modern polymer material modification, blending, filling, reinforcement and pelletizing production. It is widely used in high-end pelletizing fields such as general plastic modification, engineering plastic alloys, thermoplastic elastomers (TPE/TPV), color masterbatches, filling masterbatches, chemical crosslinking and dynamic vulcanization. Through the co-rotating parallel twin-screw structure, it realizes continuous conveying, shearing, melting, mixing, dispersion, homogenization, degassing and extrusion molding of materials, and finally cooperates with the pelletizing system to produce uniform, stable and high-performance plastic pellets.

1. Working Principle

After materials enter the barrel through the precision metering feeding system, they are gradually heated and melted under the forced conveying and shearing action of the screw elements, and fully mixed and dispersed with fillers, additives, elastomers, oils and other components. The equipment removes moisture and small-molecule volatiles through multi-stage vacuum degassing to ensure that the materials are dense and free of pores. The melted and homogenized melt is extruded under stable pressure through the die head, and then the cooling, cutting and post-processing are completed through the strand water-cooled pelletizing, water-ring pelletizing or underwater pelletizing system, and finally the finished particles with uniform particle size and stable performance are obtained.

2. Structural Features

2.1 High Torque and High Speed Transmission System

Adopting a high-precision gearbox, it has large output torque and stable operation, which can adapt to heavy-load working conditions such as high filling, high viscosity and dynamic vulcanization, ensuring mixing intensity and production stability.

2.2 Screw and Barrel System with Large Length-to-Diameter Ratio

The commonly used length-to-diameter ratio L/D is 48:1 ~ 52:1, providing sufficient residence and reaction space, which is suitable for multi-stage process requirements such as melting, dispersion, crosslinking and homogenization of complex formulas.

2.3 Modular Combined Screw Structure

Screw elements can be freely combined according to the process to realize functions such as strong shearing, weak shearing, conveying, kneading and reverse pressure building, which can accurately adapt to different processes such as TPE blending, TPV dynamic vulcanization, glass fiber reinforcement and inorganic filling.

2.4 High-Precision Coordination of Screw and Barrel

The screw and barrel have small clearance, strong wear resistance and high processing precision, ensuring mixing uniformity, material stability and service life of the equipment.

2.5 Multi-Stage Vacuum Degassing System

Equipped with single-stage or multi-stage vacuum degassing ports, it can effectively remove moisture, volatile components and small-molecule substances, improving the compactness of particles and the appearance performance of products.

2.6 Intelligent Closed-Loop Control System

Adopting PLC + touch screen full-automatic control, it can real-time monitor key parameters such as temperature, screw speed, melt pressure, main engine torque and feeding capacity, realizing automatic and stable continuous production.

3. Process Application Scope

• Thermoplastic elastomer pelletizing: TPE (SBS/SEBS) blending modification, TPV dynamic vulcanization pelletizing

• Plastic filling modification: calcium carbonate, talcum powder, glass fiber reinforcement, flame-retardant modification

• Functional masterbatches: color masterbatches, filling masterbatches, toughening masterbatches, antibacterial masterbatches

• Engineering plastic alloys: PC/ABS, PA, PBT, PET and other modified pelletizing

• Degradable materials: PLA, PBAT biodegradable plastic blending modification

• Special materials such as low-smoke halogen-free cable materials, chemical crosslinking materials and hot melt adhesives

4. Core Advantages

4.1 Excellent Mixing Effect

The materials are uniformly dispersed without white spots or lumps, which is suitable for the production of high-demand elastomers and modified plastics.

4.2 Strong Process Adaptability

It can realize complex processes such as one-step extrusion pelletizing, two-step dynamic vulcanization, multi-stage side feeding and liquid oil injection.

4.3 Continuous and Stable Production

Suitable for large-batch and long-time continuous production, with high product consistency and low energy consumption.

4.4 High Automation

Precision metering, automatic temperature control, fault alarm and data recording reduce manual dependence and improve product stability.

4.5 Compatible with Multiple Pelletizing Methods

It can be matched with strand water-cooled pelletizing, water-ring pelletizing and underwater pelletizing, meeting the full range of pelletizing needs from rigid engineering plastics to ultra-soft TPE/TPV elastomers.

5. Typical Application Fields

The twin-screw extruder pelletizer is the core main machine of TPE/TPV elastomer production lines, plastic modification production lines and masterbatch production lines. It is widely used in high-end polymer material manufacturing fields such as auto parts, wires and cables, seals, daily necessities, 3C electronics, pipes, shoe materials and packaging materials.