Explosion-Proof SAT65 Twin Screw Extruder for PLA/PETG/ABS Compounding
- Clients in: Compounding
USEON delivered an Ex tb IIIC rated SAT65 twin screw extruder strand pelletizing line to an advanced materials manufacturer, designed for PLA, PETG, and ABS compounding with carbon fiber and powder additives, supporting stable continuous production at 500–700 kg/h.
A Chinese advanced materials manufacturer focusing on high-value engineering plastics and bio-based materials (widely used in 3D printing material compounding and functional modified materials) needed to expand its operations. Driven by capacity expansion and material formulation upgrades, the client required a new extrusion compounding line. The project required a target output of 500–700 kg/h and a line configuration that could meet the workshop’s combustible dust safety requirements.
Key Specifications
| Machine Model | SAT65 Twin Screw Extruder |
| Application | PLA, PETG, ABS compounding |
| Target Capacity | 500–700 kg/h |
| L/D | 44 |
| Main Motor | 160 kW Permanent Magnet Synchronous Motor |
| Feeding System | Multi-component loss-in-weight feeders |
| Additives | Powder mixtures, carbon fiber |
| Pelletizing Method | Strand pelletizing line |
| Explosion Protection | Ex tb IIIC T4 for motor, hydraulic station and vacuum system; Ex tb IIIC T2 for heaters and gearbox; IP65 protection |
| Control System | Siemens PLC with HMI touchscreen control system |
Processing Challenges
Strict Dust Explosion Protection: The processing environment carried a risk of dust accumulation, requiring the entire system (including motors, heating units, dosing systems, and downstream equipment) to meet specific explosion-proof standards.
Stable Dosing of Complex Multi-Component Materials: The formulation involved base polymer pellets, bridging-prone powder mixtures, and carbon fiber feeding. This placed higher requirements on the sealing, accuracy, and continuous material flow of the dosing system.
Energy Efficiency and Maintenance: Conventional high-power drive systems can lead to higher energy consumption. The client wanted a more efficient drive solution to reduce long-term operating costs and routine maintenance requirements.
System-Level Equipment Protection: A comprehensive interlocking protection mechanism was required to manage potential overpressure or material jamming during production.
USEON Solution
To address these challenges, the USEON team custom-engineered an SAT65 twin screw extruder strand pelletizing line. This project was not simply an extruder supply. It was a system-level configuration covering material handling, combustible dust protection, feeding stability, drive efficiency, strand pelletizing, and line-wide interlocking. The entire system—from raw material handling to final pelletizing—features a systematic explosion-proof and enclosed design. It integrates a high-precision loss-in-weight feeding system, a modular side feeder, and a Siemens PLC + HMI control system for line-wide monitoring and interlock control.
Designed for Combustible Dust Safety Requirements: The full-line Ex tb IIIC dust explosion-proof design helps reduce dust-related safety risks during the addition of special powders and carbon fibers.
Supports Stable and Accurate Dosing: The integration of multiple enclosed high-precision loss-in-weight feeders, combined with anti-bridging silo designs and modular side feeders, helps handle the feeding challenges of low-bulk-density materials. It supports stable dosing for complex formulations while maintaining a clean workshop environment.
Optimizing Energy and Maintenance: The 160 kW permanent magnet synchronous motor helps improve drive efficiency and features rapid response times, designed to reduce routine maintenance requirements over the equipment’s lifecycle.
Multiple Interlocks to Protect Core Components: The Siemens PLC with HMI touchscreen control system links the die melt pressure with the main extruder, the gearbox lubrication oil pump, and the feeders through interlock logic. Paired with the R+W safety coupling, it can trigger a shutdown during abnormal overload events to protect the core gearbox and screw elements.
On-Site Video
Site Acceptance and Production Result
The SAT65 production line has successfully completed acceptance and commissioning at the customer’s site. During on-site commissioning, the technical team focused on verifying several key parameters: material switchovers, powder feeding continuity, carbon fiber side feeding stability, melt homogeneity, strand continuity, and pellet uniformity.
The equipment demonstrated excellent process adaptability during production changeovers between PLA, PETG, and ABS materials. The actual operating capacity remains stable at 500–700 kg/h, and the entire explosion-proof system met the site safety requirements defined for the project, providing reliable support for the client’s efficient and continuous production.
Suitable Applications
This configuration is specifically built for advanced material enterprises with strict dust explosion protection requirements in their production environments. Its processing characteristics are highly suitable for 3D printing material compounding, engineering plastic alloys, bio-based materials (such as PLA/PBAT), and functional masterbatch production involving high powder loading or glass/carbon fiber reinforcement.
Discuss Your Compounding Project
Are you looking for an extrusion solution that meets your target output, combustible dust safety requirements, and complex formulation needs? Contact the USEON technical team today. To help us design the most suitable custom compounding pelletizing line for your project, please provide the following details in your inquiry:
- Target output
- Material type
- Additive form
- Powder or fiber content
- Explosion-proof or workshop safety requirements
FAQ
A: The line was configured according to the project’s Ex tb IIIC dust explosion protection requirements (Temperature class T2/T4, Protection class IP65), making it suitable for the combustible dust conditions defined for this application.
A: The system utilizes silos equipped with anti-bridging vibration devices and optimized loss-in-weight feeder hoppers with horizontal agitation. Combined with dedicated side feeders, this supports continuous and smooth material flow for lightweight or specially shaped materials.
A: Permanent magnet synchronous motors offer a wide speed regulation range and a compact footprint. By eliminating certain stages of traditional reduction transmissions, they help improve drive efficiency and result in lower routine maintenance requirements.
A: We implemented dual mechanical and electrical protection. Mechanically, it features a torque-limiting coupling. Electrically, the PLC monitors and links the melt pressure with the main motor and the gearbox lubrication oil pump through interlock logic in real time, executing an immediate shutdown during anomalies to prevent damage to core components.
A: Yes. The SAT65 line is designed for PLA, PETG and ABS compounding with powder or fiber additives. Its enclosed dosing system, twin screw compounding section and strand pelletizing line help support pellet consistency, dispersion and downstream processability for 3D printing material applications.