rPET for bottle-to-bottle applications
POLYMETRIX rPET bottle-to-bottle technology is employed to convert washed PET flakes to pure rPET pellets. This technology is selected when rPET production takes place independently from a virgin PET manufacturing plant.
Post-consumer PET bottles are collected either by deposit or drop-off schemes, by curb side collection and scavenging from waste streams. The bottles undergo grinding, intense surface cleaning and sorting in PET wash plants. The resulting PET flakes are the input material for the POLYMETRIX bottle-to-bottle rPET process.
The process consists of an initial extrusion step with melt degassing and melt filtration and is followed by pelletizing and a decontamination step in an SSP under nitrogen.
The SSP leaN concept is favored, due to the typically lower capacities of rPET plants. Extrusion and SSP are either linked by melt-to-pellet crystallization or remain independent operations.