SSP Solid-State Viscosity Increasing Equipment for PET Recycling

Product Overview

Our SSP (Solid-State Polycondensation) equipment is specifically designed for the PET recycling industry to increase the intrinsic viscosity (IV) of recycled PET materials. By processing low-IV PET flakes, pellets, or waste through a solid-state polycondensation reaction, the system upgrades them to high-quality, premium-grade materials suitable for food-grade packaging, high-strength textiles, strapping, and engineering applications.

Applicable Materials

Material Description RPET Flakes Recycled PET flakes from post-consumer bottles PET Bottle Flakes Washed and sorted bottle flakes Strapping Scrap PET strapping band waste and off-cuts PET Fiber Waste Spinning waste, textile-grade PET scrap Other PET Recyclates Various forms of recycled PET requiring IV upgrade

How It Works

The SSP process increases the molecular weight and intrinsic viscosity of PET pellets through a solid-state polymerization reaction under controlled temperature and vacuum or nitrogen atmosphere. This improves the material's mechanical strength, thermal stability, and barrier properties.

Key Advantages

Significant IV Improvement – Raises IV to 0.75–0.90 dL/g, meeting food-grade and high-end application requirements

Wide Material Compatibility – Processes RPET flakes, bottle flakes, strapping scrap, fiber waste, and more

Flexible Process Options – Batch or continuous configurations to match your production scale

Upgrades Low-Value Waste – Transforms low-grade PET scrap into high-value premium pellets

Durable Construction – Built for reliable, long-term operation in demanding industrial environments

Typical Applications of Upgraded PET

Food-grade packaging (bottles, sheets, trays)

High-strength textile fibers and filaments

Strapping and industrial tapes

Engineering plastics and automotive components