Reaction extrusion and sensor-aided molding for recycled PET enhancement
A novel approach using chemical reaction extrusion and in-cavity pressure sensors to enhance the quality and consistency of recycled PET, making it comparable to virgin PET in terms of viscosity and performance.
Overview
This innovative solution addresses the variability in properties of recycled polyethylene terephthalate (PET) materials. By employing a chemical reaction extrusion process, the technology modifies recycled PET to mimic the viscosity profiles of virgin PET. This is combined with the use of in-cavity pressure sensors during injection molding to monitor and optimize flowability, ensuring the modified PET performs similarly to neat PET. This approach aims to stabilize the material properties across different batches, enhancing the consistency and reliability of recycled PET.
Technical specifications
- Reaction extrusion process: Alters the molecular structure of recycled PET, improving its viscosity to match that of virgin PET.
- In-cavity pressure sensors: Used during injection molding to monitor and adjust flowability and cycle time.
- Material characterization: Involves mixing recycled PET with additives like plasticizers and copolymers to achieve desired thermal and rheological properties.
- Batch preparation: Creation of PET batches with varying compositions to simulate real-world recycling variations and test process adaptability.
Technology readiness level
This technology is at TRL 6, having been validated in a relevant environment with plans for further testing and optimization to ensure commercial viability.
About Western Washington University
Western Washington University is a comprehensive public university and Washington’s third‑largest public institution, serving a broad mix of undergraduate and graduate programs from its Bellingham campus and statewide locations. Industry collaboration is enabled by a waterfront Technology Development Center for joint R&D and by a coastal field station with direct access to the Salish Sea. Companies can engage through industry‑accessible instrumentation and facilities, sponsored projects, and regional business support resources. Research is supported by competitive federal and state funding, including the National Science Foundation. The Office of the Vice Provost for Research manages IP, NDAs/MTAs, and licensing, and offers commercialization training with the Washington Research Foundation.
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