Investigation of mechanical properties of recycled polypropylene

摘要: Every year there is an Increase in the amount of plastics formed by all types processes, such as extrusion, blow moulding, injection etc The recycling waste plastic materials 1s developing at a manufacturing process scale, and rts arm to increase further sales o f plastrc products reducing raw material costs However thrs economic argtunent rs only one reasons why it important recycle these materials. other environmental. Each time item passes through process, its quality reduced. Some can be recycled over again. This research concerns number times polypropylene (PP) mouldlng recycled. work focuses on materlal dter each operation Material was passed forming up three Also, since posslble improve quallty reliability polypropylene, addlng percentage fresh "raw" rnatenal, study included rnvest~gatront optirnlse mechanical properties using this approach. The moulding used produce whose could measured provide indication that stage. relationship between parameters qualify subsequent analysed, thls extended for cases where twlce or equipment powders ploduced m trlals were then mixed with diffelent percentages material, equrpment again propert~esc ould measured. To reduce permutations Design Experiments (DOE) method implemented define conditions whlch resulted In optimum product belng once, twice tlmes. A 2 Factorla1 (FD) techque also used. Different mathematical models obtained show parameters, recycled, Thls effect adding powder mix. All verified experimentation resuIts predict adequately, once processing have been defined.