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Application of Design of Experiments for Microwave Oven Plastic Parts Defectives Reduction |
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| รหัสดีโอไอ | |
| Creator | Chatpon Mongkalig |
| Title | Application of Design of Experiments for Microwave Oven Plastic Parts Defectives Reduction |
| Publisher | Environmental Engineering Association of Thailand |
| Publication Year | 2564 |
| Journal Title | Thai Environmental Engineering Journal (TEEJ) |
| Journal Vol. | 35 |
| Journal No. | 1 |
| Page no. | 15-21 |
| Keyword | Design of Experiments, Analysis of Variance, Nonconforming Products Reduction, Electrical Appliances |
| URL Website | https://so05.tci-thaijo.org/index.php/teej |
| Website title | Thai Environmental Engineering Journal (TEEJ) |
| ISSN | 2673-0359 |
| Abstract | The 3R (Reduce-Reuse-Recycle) Conceptis a sequence of steps on how to manage waste properly. The top priority is Reduce, which is to reduce waste generation, then Reuse, andfinallyRecycle. The main priority is always to reduce and prevent the waste generation from the production process (Reduce).The objective of this research is to prevent the waste generation and decreasethe percentage of defectivesfromthe injection molding process ofan electrical appliancesfactory.Microwave ovens arethe best-selling products ofthe case study. The nonconforming productsdata of the production process of microwave plastic parts wascollected and analyzed. It wasfound that the occurrence of defectives from plastic front frame injection molding processwasthe most important problem. The major nonconforming problem was the abnormalplastic shape. Design of Experiments(DOE)method wasapplied to determine the optimal pressure and temperature levels of injection machines for defectives percentage minimization. For experimental design, a two-factor Completely Randomized Design (CRD) wasgenerated and Analysis of Variance (ANOVA)wascarried out.According to the ANOVA, pressure and temperature hada significant effect on defectives percentage. A significant interaction between the two factors wasfound. According to interaction plots, the optimal levels forpressure and temperature of injection molding processwere79 bar and 230°C, respectively. Additionally, the confirmation test wasconductedand it wasconcluded that themean of defectivespercentageproducedbythe optimal temperature and pressure process wassignificantly lower than the mean of the defectives percentage produced bythe current process of the case study. |
