Study of Flow Font Advancement during Filling Stage of a Spiral Mold

Abstract:

The objective of this paper consists in the determination of the flow front length using o circular spiral mold. The paper also studies the influence of the process parameters on the flow front length using the method of statistical analysis. For this purpose, a number of numerical simulations are carried out by utilizing the combination of four process parameters (i.e., the melt temperature, the spiral thickness, the injection pressure and the mold temperature) at three levels. In order to reduce the number of numerical simulations, a simplistic Taguchi L₂₇ orthogonal array was chosen. The material chosen for this study was a low density polyethylene and a high density polyethylene. The flow front length was measured through a marked pattern of the circular spiral using the AutoCAD.

• Periodical: Applied Mechanics and Materials (Volume 371)
• Pages: 534-538
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.371.534
• Online since: August 2013
• Authors: Ionut Laurentiu Sandu, Felicia Stan, Catalin Fetecau
• Keywords: Flow Front Advancement, Numerical Simulation, Spiral Mold, Thin Wall Injection Molding

References

[1] D. Yao, B. Kim, Increasing Flow Length In Thin Wall Injection Molding Using A Rapidly Heated Mold, Polym-Plast. Technol. 41 (2002) 819-832.

DOI: 10.1081/ppt-120014390

[2] M. -C. Huang, C. -C. Tai, The effective factors in the warpage problem of an injection-molded part with a thin shell feature, J. Mater. Process. Tech. 110 (2001) 1-9.

DOI: 10.1016/s0924-0136(00)00649-x

[3] T. Erzurumlu, B. Ozcelik, Minimization of warpage and sink index in injection-molded thermoplastic parts using Taguchi optimization method, Mater. Design. 27 (2006) 853-861.

DOI: 10.1016/j.matdes.2005.03.017

[4] S.J. Liao, D.Y. Chang, H.J. Chen, L.S. Tsou, J.R. Ho, H.T. Yau, W.H. Hsieh, J.T. Wang, Y.C. Su, Optimal process conditions of shrinkage and warpage of thin-wall parts, Polym. Eng. Sci. 44 (2004) 917-928.

DOI: 10.1002/pen.20083

[5] G. Xu, Study of thin-wall injection molding, Dissertation, The Ohio State University, (2004).

[6] M.C. Song, Z. Liu, M.J. Wang, T.M. Yu, D.Y. Zhao, Research on effects of injection process parameters on the molding process for ultra-thin wall plastic parts, J. Mater. Process. Tech. 187-188 (2007) 668-671.

DOI: 10.1016/j.jmatprotec.2006.11.103

[7] M.P. Jones, R.N. Callahan, R.D. Bruce, Flow Length Measurement of Injection Molded Spirals Using a Flatbed Scanner, J. Ind. Teh. 27 (2011) 1-8.

[8] A. Özdemir, O. Uluer, A. Güldaş, Flow front advancement of molten thermoplastic materials during filling stage of a mold cavity, Polym. Test. 23 (2004) 957-966.

DOI: 10.1016/j.polymertesting.2004.04.011

[9] A. Martinez, J. Castany, D. Mercado, Characterization of viscous response of a polymer during fabric IMD injection process by means a spiral mold, Measurement 44 (2011) 1806-1818.

DOI: 10.1016/j.measurement.2011.09.011

[10] C. -P. Chena, M. -T. Chuangb, Y. -H. Hsiaob, Y. -K. Yangb, C. -H. Tsaia, Simulation and experimental study in determining injection molding process parameters for thin-shell plastic parts via design of experiments analysis, Expert. Syst. Appl. (2009).

DOI: 10.1016/j.eswa.2009.02.017

[11] Autodesk Moldflow Insight.

[12] R.K. Roy, A Primer on the Taguchi Method, Second Edition, Society of Manufacturing Engineering, (2010).

[13] Minitab 16.