Twin-screw systems are commonly used to process regrind and flakes made from PP, PE, ABS, PS, PA, and PC. Common sources include automotive bumpers and appliance housings. Its composition is often mixed and requires stable mixing during processing.

A single-stage twin-screw plastic pelletizing line is usually chosen when material behavior is not complex and is more predictable. Its compact layout and smaller footprint make it suitable for general plastics or applications with basic modification requirements.