Phongphattarawut, W. , Muparang, S. , Wasanbongngem, N., Nithikarnjanatharn, J. and Nutkhum, W. 2024. Comparison of Polypropylene Flow Index to Increase Injection Efficiency In Plastic Injection Mold, 2 Cavities of Different Shapes Plastic (Case Study : Pencil Box). RMUTL Engineering Journal. 9, 2 (Dec. 2024), 21–29. DOI:https://doi.org/10.14456/rmutlengj.2024.11.