PRODUCTS

The SUHUI PET Solid State Polymerization (SSP) System is a specialized industrial solution designed to enhance the intrinsic viscosity (IV) and mechanical properties of polyethylene terephthalate (PET) resin. It transforms low-IV PET chips or recycled flakes into high-quality material suitable for demanding applications including food-grade beverage bottles, polyester fiber, and engineering plastics.

The system operates in a controlled, oxygen-free environment using heat and inert nitrogen gas. This triggers molecular chain extension, increasing crystallinity and IV value while minimizing thermal degradation. The result is a consistent, high-performance PET material that meets food contact and fiber-grade specifications.

Ideal for PET recycling plants, bottle-to-bottle recycling operations, and virgin PET producers, the SUHUI SSP system supports both post-consumer recycled (PCR) flakes and virgin PET chips. Its modular design allows seamless integration into existing production lines or standalone turnkey operation.

Key Features of SUHUI PET Solid State Polymerization System

• High Thermal Efficiency: Advanced multi-zone heating ensures precise temperature control (200–230°C) for consistent, optimal polymerization throughout the reactor.
• Inert Nitrogen Gas Circulation: Continuous nitrogen purging prevents oxidation and removes by-products, maintaining material purity and color stability.
• Automated PLC Control: Touchscreen interface provides real-time monitoring and adjustment of temperature, gas flow, residence time, and IV targets.
• Scalable Capacity: Available in batch or continuous configurations with output ranging from 50 to 2,000 kg/h to match production requirements.
• Energy Recovery System: Integrated heat exchangers recycle thermal energy from exhaust gas, significantly reducing operating costs.
• Closed-Loop Design: Minimizes dust generation and particle contamination, ensuring clean, food-grade output quality.
• Recycled PET Compatible: Designed for post-consumer PET flakes as well as virgin resin, supporting circular economy and bottle-to-bottle recycling goals.
• Safety Certified: Explosion-proof components and gas leakage detection alarms; CE and ATEX compliant.

PET SSP Process Workflow

1. Pre-Drying: PET chips or recycled flakes are dried in a dehumidifying dryer to reduce moisture content below 50 ppm, preventing hydrolytic degradation in the reactor.
2. Pre-Crystallization: Dried material is heated to 120–160°C in the crystallizer to increase crystallinity and prevent particle agglomeration during the SSP stage.
3. SSP Reactor: Crystallized PET is fed into the vertical or horizontal SSP reactor, where it is heated to 200–230°C under continuous nitrogen flow. Residence time is 6–12 hours (batch) or 8–24 hours (continuous) depending on the target IV increase.
4. Nitrogen Purging: Inert nitrogen gas continuously removes reaction by-products (water, acetaldehyde, ethylene glycol) from the reactor, driving the polymerization reaction forward.
5. Cooling & Stabilization: Polymerized PET is transferred to a cooling unit where it is brought to ambient temperature, locking in the achieved IV gains and preventing post-crystallization.
6. Sieving & Packaging: Finished PET pellets pass through a sieve to remove fines and oversized particles, then are conveyed to storage silos or bagged for shipment.