This investigation demonstrates mechanical properties reduction in co-injection molded thin-wall packaging, suggesting optimal core design enhances sustainability.
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.
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Wieczorek et al. (2025) studied this question.
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