TOMRA and NEXTLOOPP have applied fluorescent markers to MCC Verstraete’s In Mold Labels (IML) in an extension of the team’s efforts to bring its PolyPPRISM sorting technology to commercial scale and recycle food-grade polypropylene.
TOMRA’S AUTOSORT unit, FLYING BEAM, was integrated with UV illumination for the initial trials. Direct spectrophotometric measurements were then used to analyse the strength of the fluorescence emissions and ensure that there was enough fluorescent signal for the food-grade labelled packs to be sorted.
According to internal tests, the trials resulted in 100% purity and 100% yield. Now NEXTLOOPP is working with MCC Verstraete to showcase its NextCycle IML in-mould labels. Made of polypropylene, the adhesive free, fully printed labels are wrapped around a polypropylene tub, which it reportedly separates from during the grinding and air elutriation process.
As such, printed label flakes are said to separate from the polypropylene, preventing inks and decorations from contaminating the recycled material. Therefore, it is hoped that polypropylene substrates can be fully decorated with IML containers without the threat of contaminating recycling streams with print and label residues.
Future trials plan to apply the technology to other NEXTLOOPP participant-branded products.
If you liked this article, you might also enjoy: