PROPORTION ANALYSIS OF POLYPROPYLENE SCRAP FOR INJECTION MOLDING OF THERMOPLASTIC PARTS OF ELECTRICAL APPLIANCES
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Abstract
Polypropylene scrap, which is considered to be waste, frequently remains behind in the injection molding process of thermoplastic parts. Various plastic industries are interested in recycling to reduce environmental problems. The objective of this research was to analyze the proportion of polypropylene scrap that had undergone the injection molding process and pure polypropylene that still had suitable properties for injection molding into thermoplastic parts of electrical appliances. The independent variables of interest were ratio of polypropylene scrap fraction to pure polypropylene and the number of rounds of polypropylene scrap that had undergone the injection molding process. For the response variables, they were mechanical properties of thermoplastic. The acceptable recycled thermoplastic must meet mechanical criteria including the izod impact strength was greater than 126 Joule per meter (J/m), the tensile strength at yield point was greater than 23.4 megapascal (MPa) and the elongation at yield point was greater than 6.30 percent (%). The results of the study found that 1) polypropylene scrap that had undergone the injection molding process after 1 round could be used up to 50 percent by weight, 2) polypropylene scrap that had undergone the injection molding process after 2 rounds could be used up to 30 percent by weight, and 3) polypropylene scrap that had undergone the injection molding process after 3 rounds could be used up to 10 percent by weight.
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The published articles are copyright of the Engineering Journal of Research and Development, The Engineering Institute of Thailand Under H.M. The King's Patronage (EIT).
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