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Experimental rapid surface heating by induction for injection molding of large LCD TV frames

  • Shih-Chih Nian , Che-Wei Lien and Ming-Shyan Huang EMAIL logo
Published/Copyright: February 12, 2014
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Abstract

The use of electromagnetic induction heating on achieving high mold temperature has been proven to effectively improve the appearance quality of injection molded parts. However, until now, the method has only successfully been used on heating small mold surfaces. This study aims to apply the method on a large injection mold that is used for producing 42-inch LCD TV frames. With the goals of achieving heating efficiency and uniformity, the main focus in this research is designing the induction coil. Initially, three types of induction coils – a single-layered coil with currents that flow in one direction, a single-layered coil with currents that flow in opposite directions, and a two-layered coil – were compared to confirm their heating rates; the best one was then chosen. Additionally, evaluation of various induction coils was preceded with commercial simulation software that supports electromagnetic and thermal analyses. An experiment involving heating a simple workpiece with a heated area similar to that of the male mold plate of the LCD TV frames was conducted to confirm its heating rate and uniformity. Real injection molding LCD TV frames assisted with induction heating was then carried out. Experimental results depicted that: (1) a single-layered coil with currents that flow in one direction performed best; (2) that it heated the simple workpiece at a high heating rate of 5.5°C/s with reasonable temperature uniformity (standard deviation: 5.1°C); and (3) induction heating of a 42-inch LCD TV frame mold surface in practical injection molding provided a high heating rate of 4.5°C/s with favorable temperature uniformity (standard deviation: 4.0°C).


Corresponding author: Ming-Shyan Huang, Department of Mechanical and Automation Engineering, National Kaohsiung First University of Science and Technology, 2 Jhuoyue Road, Nanzih, Kaohsiung City 811, Taiwan, R.O.C., e-mail:

Acknowledgments

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract No. NSC-101-2221-E-327-006.

References

[1] Chen SC. U.S. Patent, 2005, 6909545.Search in Google Scholar

[2] Chen SC, Jong WR, Chang YJ, Chang JA, Cin JC. Sens. J. Micromech. Microeng. 2006, 16, 1783–1791.Search in Google Scholar

[3] Yao D, Chen M, Kim B. Polym. Eng. Sci. 2002, 12, 2471–2481.Search in Google Scholar

[4] Hatch D, Kazmer D, Fan B. ANTEC, Conf. Proc., Dallas, TX, 2001, 1, 428–432.Search in Google Scholar

[5] Chang PC, Hwang SJ. Heat Mass Transf. 2006, 49, 3846–3854.Search in Google Scholar

[6] Chang PC, Hwang SJ. J. Appl. Polym. Sci. 2006, 102, 3704–3713.Search in Google Scholar

[7] Wang G, Zhao G, Li H, Guan Y. Mater. Design 2010, 31, 3426–3441.10.1016/j.matdes.2010.01.042Search in Google Scholar

[8] Wang G, Zhao G, Li H, Guan Y. Mater. Design, 2010, 31, 382–395.10.1016/j.matdes.2009.06.010Search in Google Scholar

[9] Jeng MC, Chen SC, Minh PS, Chang JA, Chung CS. Int. Commun. Heat Mass 2010, 37, 1295–1304.10.1016/j.icheatmasstransfer.2010.07.012Search in Google Scholar

[10] Huang MS, Tai NS. J. Appl. Polym. Sci. 2009, 113, 1345–1354.Search in Google Scholar

[11] Huang MS, Huang YL. Int. J. Heat Mass Transf. 2010, 53, 2414–2423.Search in Google Scholar

[12] Huang MS, Yu JC, Lin YZ. J. Appl. Polym. Sci. 2010, 118, 3058–3065.Search in Google Scholar

[13] Chen SC, Peng HS, Chang JA, Jong WR. Int. Commun. Heat Mass 2004, 31, 971–980.10.1016/j.icheatmasstransfer.2004.05.007Search in Google Scholar

[14] Rudolf R, Mitschang P, Neitzel M. Compos. Part A-Appl. S. 2000, 31, 1191–1202.Search in Google Scholar

[15] Bae KY, Yang YS, Hyun CM, Cho SH. Int. J. Mach. Tool Manu. 2008, 48, 1646–1652.Search in Google Scholar

[16] Magnabosco I, Ferro P, Tiziani A, Bonollo F. Comp. Mater. Sci. 2006, 35, 98–106.Search in Google Scholar

[17] Lin HL, Chen SC, Jeng MC, Minh PS, Chang JA, Hwang JR. Int. Commun. Heat Mass 2012, 39, 514–522.10.1016/j.icheatmasstransfer.2012.02.009Search in Google Scholar

[18] Ernst R, Perrier D, Feigenblum J, Hemous R. Proceedings of the COMSOL Users Conference, Paris, 2006.Search in Google Scholar

[19] Chen SC, Wang YC, Liu SC, Cin JC. Sens. Actuators, A 2009, 151, 87–93.10.1016/j.sna.2009.02.015Search in Google Scholar

[20] José F, Alex G. JEC Compos. Mag. 2010, 58, 62–66.Search in Google Scholar

[21] Sung YT, Lin YN, Hwang SJ, Lee HH, Huang DY. ANTEC, Conf. Proc., Orlando, FL, 2012, 2, 1427–1436.Search in Google Scholar

[22] Solved with COMSOL Multiphysics 4.0a, COMSOL AB. 2010, 1–42.10.1016/S1350-4789(10)70335-4Search in Google Scholar

[23] Huang MS, Tsai SW, Lian JW, Nian SC. ANTEC, Conf. Proc., Orlando, FL, 2012, 2, 1471–1476.Search in Google Scholar

Received: 2013-9-23
Accepted: 2014-1-11
Published Online: 2014-2-12
Published in Print: 2014-4-1

©2014 by Walter de Gruyter Berlin/Boston

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