The aim of this study was to evaluate if the properties of multiple
extruded blends from polypropylene with a dispersed ironbased
oxygen scavenger differ from pure PP. A further intention
was to determine if and how much oxygen absorption capacity is
lost by multiple extrusions. The results are relevant for packaging
material manufacturers.
Polypropylene was chosen for following reason: Many trays and
pouches are primarily made of polypropylene. The production
scrap such as stamping grids and faulty packagings is grinded in
many cases and used as raw material for new polymer layers in
order to achieve a maximum recovery and to reduce material losses.
Not much is known about the influence of oxygen scavengers
on such recycling processes.
To the authors knowledge the oxygen absorption capacity and
the number of extrusions was correlated the first time.