Effect of reprocessing on the service life properties of glass fiber-reinforced in-house polypropylene waste composites

Analysis of Selected Properties of Polymer Mixtures Derived from Virgin and Re-Granulated PP with Glass Fibers

“…These are mainly polymeric materials belonging to the group of thermoplastics. Their great advantage is the possibility of reprocessing them, which people often overlook, resulting in them ending up in landfills [ 1 , 2 , 3 , 4 , 5 , 6 ].…”

“…The mixtures were produced using a compounding extruder (see diagram). Most authors present research results based on the recycling of polymer composites filled with glass fibers or the analysis of the properties of thermoplastic composites made from secondary raw materials [ 1 , 2 , 5 , 6 , 9 , 12 , 17 , 18 , 19 , 20 ].…”

“…The tests showed a deterioration in all the analyzed properties (the physical, mechanical, structural, rheological, and thermal properties of the reprocessed in-house waste) after each reprocessing cycle. The authors pointed out that, for industrial waste, only two reprocessing cycles are necessary, and that, for a larger number of reprocessing cycles, it is necessary to dose the virgin polymer material [ 1 ]. The amount of glass fibers in the composite and the processing rate were also analyzed by Achukwu et al (2022).…”

“…As the research shows, the recycling of polypropylene composites filled with glass fibers is a commonly used solution aimed at reusing waste from many industries. The properties of the material after the recycling process will depend mainly on the length of the glass fibers as well as on the number of times they are processed (Achukwu et al (2022 and Achukwu et al (2023) [ 1 , 8 ]). Researchers also point out that in order to obtain or maintain the assumed properties of recycled thermoplastic polymers, it is necessary to dose the original polymers into the re-granulates.…”

“…The mixtures were produced using a compounding extruder (see diagram). Most authors present research results based on the recycling of polymer composites filled with glass fibers or the analysis of the properties of thermoplastic composites made from secondary raw materials [1,2,5,6,9,12,[17][18][19][20]. Evens et al (2019) analyzed the process of manufacturing and recycling composites based on polypropylene filled with 20% glass, carbon, and natural fibers (flax).…”