Applicability of recycled HDPE for Rotational Molding
Dvorak, Maria (2016)
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This thesis work is focused on studying use recycled HDPE instead of raw HDPE in rotational molding process in order to create significant environmental and economic benefits. The study examines the difference between properties of recycled HDPE and ref. HDPE. Also, it defines the difference between melt flow index of ref.HDPE and powder made of that resin. For the practical part of this work, items made of HDPE were sorted by the method of manufacturing, by the type of item and by the usage time. Items were recycled mechanically and dumbbell samples were produced by injection molding. Then mechanical properties were assessed from tensile tests and melt flow index was evaluated by melt flow index test. As a result, recycled materials initially manufactured by extrusion blow molding can’t be used in rotational molding because MFI of these materials is too low for rotational molding. However, recycled materials that were manufactured by rotational molding and injection molding have enough value of MFI for rotational molding.