PETpla.net Insider 08 / 2014

MATERIAL / RECYCLING 19 PET planet insider Vol. 15 No. 08/14 www.petpla.net An efficient barrier is essential for us. We inspect it. www.intravis.com Figure 1: Anthranilamide reaction Figure 2: Polyamide reaction Simulated recycling study Further, plaques were moulded at equivalent AA reduction perfor- mance (0.1% anthranilamide vs 0.3% polyamide). Samples of plaques were retained for subsequent colour meas- urement, while the rest were cryogeni- cally milled into granules. These gran- ules were re-crystallised in a vacuum oven set to 190°C, with vacuum and nitrogen purge. Re-crystallised mate- rial was again moulded into plaques and the colour compared to the first mouldings. The same re-crystallised mate- rial was used to mould preforms on a Husky GL-160 machine, fitted with a twin cavity mould. The significantly reduced b* (yellow) colour variation of the anthranilamide process versus the polyamide process suggests the anthranilamide-based formulation not only provides more clarity and aesthetic quality through one heat process, but suggests polymer clarity can be maintained after recycling and at least one further heat process. The haze measurements (ASTM D1003)