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Warpage phenomenon of thin-wall injection molding |
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| Authors: | Yuh-Chyun Chiang Hsin-Chung Cheng Chiung-Fang Huang Jeou-Long Lee Yi Lin Yung-Kang Shen |
| Affiliation: | 1. Taiwan Adventist Hospital, Taipei 105, Taiwan, Republic of China 2. Department of Otolaryngology, Taipei Medical University Hospital, Taipei 11031, Taiwan, Republic of China 3. School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 11031, Taiwan, Republic of China 4. Division of Family and Operative Dentistry, Department of Dentistry, Taipei Medical University Hospital, Taipei 11031, Taiwan, Republic of China 5. Department of Chemical and Material Engineering, Lunghwa University of Science and Technology, Taoyuan 333, Taiwan, Republic of China 6. Department of Business Administration, Takming University of Science and Technology, Taipei 114, Taiwan, Republic of China 7. Graduate Institute of Industrial and Business Management, National Taipei University of Technology, Taipei 106, Taiwan, Republic of China 10. Research Center for Biomedical Devices, Taipei Medical University, Taipei 11031, Taiwan, Republic of China 8. Bio-Medical Nano/?? Forming Laboratory, School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 11031, Taiwan, Republic of China 9. Research Center for Biomedical Implants and Microsurgery Devices, Taipei Medical University, Taipei 11031, Taiwan, Republic of China |
| Abstract: | This study investigates warpage of electronic dictionary battery covers fabricated using thin-wall injection molding as a replacement for conventional insert molding. The primary concern is the molding window in thin-wall injection molding for acrylonitrile?Cbutadiene styrene (ABS) and polycarbonate (PC)+ABS plastics. Finally, the process parameters for thin-wall injection molding that eliminate warpage of electronic dictionary battery covers are identified. Experimental results demonstrate that the area of the molding window for ABS exceeds that for PC+ABS. Analysis of the molding window reveals that ABS is more appropriate than PC+ABS for battery covers. Low melt temperature, high injection speed, and high packing pressure eliminate battery cover warpage. Melt temperature is the most important process parameter for eliminating warpage when using both ABS and PC+ABS. |
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