Effect of PP+EVOH regranulate core thickness on mechanical properties of co-injection molded multilayer thin-wall packaging

This study investigates co-injection molding of thin-walled, three-layer packaging with a core of recycled blend of r(PP+EVOH) from post-consumer barrier packaging. Increase of core content (10–50% vol.) reduced skin thickness, tensile strength (−21%), elasticity modulus (−17%), and compressive force (−9%) of research objects. All molded parts maintained performance for packaging. It was confirmed that up to 50% by vol. of r(PP+EVOH) can be introduced into the core layer, supporting circular economy goals.