Advanced Buhler Bottle-to-Bottle Process
Buhler has developed a comprehensive and economical technology for up-grading of used PET-bottle flakes into new pellets suitable for direct food contact. Excellent product quality at high throughputs can be achieved. The main process steps are the decontamination and the solid-state polycondensation. Regarding the required quality parameters, such as yellowness index, acetaldehyde content or intrinsic viscosity, the Buhler RingExtruder and the Buhler continuous SSP are the most efficient technology to produce bottle grade PET. The production costs of bottle feedstock from recovered PET-bottles by using the presented technology are lower in comparison with virgin PET-bottle material.