With the growing demand for sustainable textile production and circular economy solutions, PET fibre recycling has become a key technology for reducing plastic waste and improving resource efficiency. Traditional PET recycling processes often face challenges when handling textile fibres contaminated with spin finish, spinning oils, texturiser oils and high moisture levels.
To address these challenges, PolyReTec has developed the FibrePro:IV PET fibre-to-fibre recycling system, an advanced recycling solution designed to transform difficult PET textile waste into high-quality 100% recycled rPET pellets suitable for respinning into new polyester fibres.
By combining advanced pelletizing technology, IV improvement systems and Solid-State Polycondensation (SSP) technology, the FibrePro:IV system provides an efficient pathway for closed-loop PET fibre recycling and sustainable recycled polyester production.
Meeting the Challenges of PET Textile Fibre Recycling
PET fibres are widely used in clothing, home textiles, automotive fabrics and industrial applications. However, recycling post-consumer and post-industrial PET fibres can be challenging due to contamination from various processing additives.
Common challenges include:
- Spin finish residues on fibre surfaces
- Spinning and texturiser oils
- High moisture content
- Reduced intrinsic viscosity (IV value) after repeated processing
- Material degradation during recycling
These factors can affect the quality and performance of recycled PET materials, making it difficult to produce high-value recycled fibres.
The PolyReTec FibrePro:IV system is specifically engineered to overcome these issues by providing advanced preconditioning, purification, repolymerisation and pelletizing processes.
Advanced PET Fibre-to-Fibre Recycling Technology
The FibrePro:IV recycling system integrates multiple technologies to achieve stable and high-quality rPET pellet production.
1. Preconditioning and Agglomeration System
The preconditioning unit plays a critical role in preparing contaminated PET fibres before melting and pelletizing.
It provides:
- Effective material homogenisation
- Pre-drying of PET fibres
- Removal of volatile components
- Gentle PET melting preparation
This ensures consistent feeding conditions and improves the overall stability of the recycling process.
2. PolyReTec Pelletizing System
The advanced pelletizing system enables efficient PET processing while maintaining excellent material properties.
The system delivers:
- Stable PET melt processing
- High-quality recycled PET pellets
- Improved production consistency
- Reliable operation for industrial-scale recycling
The produced rPET pellets feature excellent mechanical properties and high colour fidelity, making them suitable for demanding fibre applications.
3. IV Uptimiser for PET Repolymerisation
One of the key technologies of the FibrePro:IV system is the IV Uptimiser, which improves the intrinsic viscosity of recycled PET through repolymerisation.
During recycling, PET molecular chains may become shorter due to thermal and mechanical stress. The IV Uptimiser helps:
- Remove residual spin finish additives
- Increase PET intrinsic viscosity (IV value)
- Restore polymer performance
- Improve recycled fibre quality
This technology enables recycled PET pellets to meet the requirements of high-performance fibre production.
SSP PET Technology Improves Recycled Material Performance
The Solid-State Polycondensation (SSP) unit is specially designed for the fibre recycling industry.
Unlike conventional full melt processing, SSP takes place below the PET melting point, typically between 230–250°C, allowing PET molecular chains to extend while reducing thermal degradation.
The SSP process includes:
- Drying process with moisture level below 50 ppm
- Pre-crystallization at 150–180°C
- SSP reaction under nitrogen inert gas or vacuum conditions
- Inert gas cooling
- Moisture-proof sealed storage
Through this process, SSP technology:
- Removes water and acetaldehyde by-products
- Increases intrinsic viscosity
- Improves polymer strength
- Enhances recycled PET fibre performance
High-Quality rPET Pellets for Multiple Fibre Applications
The FibrePro:IV system produces recycled PET pellets with excellent mechanical properties, supporting the production of ultra-fine recycled polyester fibres.
The output materials are suitable for:
- Recycled PET filament fibres
- Staple fibres
- BCF fibres
- High-performance textile applications
With the ability to process challenging PET fibre waste, this technology helps manufacturers establish efficient closed-loop recycling systems and reduce dependence on virgin PET materials.
Flexible Production Capacity for Different Recycling Requirements
To meet different production needs, PolyReTec FibrePro:IV provides multiple system configurations:
| Model | Capacity | Screw Diameter |
|---|---|---|
| PTC120 | 300–400 kg/h | Φ120 mm |
| PTC150 | 600–700 kg/h | Φ150 mm |
| PTC185 | 1000 kg/h | Φ185 mm |
These models allow textile manufacturers and recycling companies to select the most suitable solution based on production scale and material requirements.
Supporting the Future of Textile Circular Economy
As global industries move toward sustainable manufacturing, PET fibre-to-fibre recycling has become an essential technology for achieving a circular economy.
The PolyReTec FibrePro:IV system provides an integrated solution for converting waste PET fibres into valuable recycled materials while maintaining high product quality.
By combining PET fibre-to-fibre recycling, rPET pellet production, SSP PET technology and spin finish removal technology, the system helps manufacturers create a more sustainable future for the textile industry.
Through continuous innovation in recycling technology, advanced solutions like FibrePro:IV are helping transform PET waste into new resources and accelerate the development of closed-loop polyester production.
Post time: Sep-09-2026