W. MÜLLER has many years of experience with the use of PCR for the production of hollow articles in the blow molding process. With the in-house ReCo3 called 3-layer-co-extrusion system, bottles can be produced consisting of a PCR layer that is surrounded inside and outside by a virgin layer. In this way, virgin material can be replaced by PCR in processing, and still unwanted migration from the PCR can be reduced.
The company has tested how the migration behavior of round bottles with a volume of 1l from 100% recyclate differs from those produced with the ReCo3 process. Two certified PCR types were selected (one was Recylen BM 948-30, sponsored by OPG Holding, Teningen) and one bottle of the pure material and one with a virgin layer in the outer layer were produced (picture). At the SGS INSTITUT FRESENIUS, Taunusstein, various migration tests were carried out, such as global migration and screening for potentially migrierable impurities, reaction and degradation products (NIAS). Global migration was tested in accordance with DIN EN 1186 2002-07 and the results were in all cases below the legal requirement of Regulation (EU) No 10/2011 of 10 mg/dm2.
However, W. MÜLLER was able to show on the basis of the tests that the ReCo3 bottles show a lower global migration compared to the pure recyclate bottles. This is also confirmed by a significant reduction in the number and concentrations of migration-capable NIAS.