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Reducing Sink Mark Defect of Cup Plastic Injection by Biodegradable Material with an Injection Rate |
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| รหัสดีโอไอ | |
| Creator | Adirake Chainawakul |
| Title | Reducing Sink Mark Defect of Cup Plastic Injection by Biodegradable Material with an Injection Rate |
| Contributor | Teerawat Sangkas, Suthaphat Kamthai, Supasit Manokruang |
| Publisher | Rajamangala University of Technology Lanna |
| Publication Year | 2568 |
| Journal Title | RMUTL Engineering Journal |
| Journal Vol. | 10 |
| Journal No. | 1 |
| Page no. | 27-34 |
| Keyword | Plastic injection molding, Shrinkage, Biodegradable, Injection parameters |
| URL Website | https://engsystem.rmutl.ac.th/journal/ |
| ISSN | 3027-7426 |
| Abstract | In this research, the issue of shrinkage in coffee cup sleeves filled with biodegradable plastic materials is investigated. Polylactic acid (PLA) and coffee grounds are two combined materials that are difficult to form by injection molding. The quality of the coffee cup sleeves declined as their surface was reduced. This study aims to investigate the effects of various plastic injection molding parameters (including clamping force, injection pressure, injection rate, and cooling times) that influence sink marks on the molded parts. The goal is to determine the optimal conditions for reducing sink marks on the molded parts. Experimental results revealed that setting the injection speed rate to 40 cm?/s and the injection pressure to 54 bar significantly reduced shrinkage, thereby enhancing the surface quality of the product. The findings suggest that configuring the injection speed rate at 40 cm?/s, the injection pressure at 54 bar, the clamping force at 100 tons, the material's melting temperature (Tm) at 180 ?C, and the mold temperature (Tw) at 60 ?C effectively minimized sink marks. This optimization resulted in a smoother and visibly improved surface finish of the molded components. These results provided an important guideline for the development of injection molding technology employing bioplastic materials that use higher viscosity than generally used with synthetic plastics. Other bioplastic goods can be produced using this method with favorable outcomes. |
