Flow Study of Wood Plastic Composite Through a Circular Die in an Extrusion Process

ADMT Journal

مقاله 4، دوره 10، شماره 2، شهریور 2017، صفحه 37-47   

نوع مقاله: Original Article

نویسندگان

N. Jafarian Jam^{* 1}؛ E. Soury²

¹Department of Mechanical Engineering, Pardis Branch, Islamic Azad University, Pardis, Iran

²Department of mechanical engineering, Arak University, Arak, Iran

چکیده

This paper presents a theoretical study on wood plastic composite's (WPC's) flow, based on empirical data provided by a twin screw extruder and experimental data from a rotational rheometer. Four circular extrusion dies were designed and manufactured to produce rod shaped products with various diameters (D) and length-to-diameter ratios (L/D). Also other parameters such as screw speed (N), polymer matrix type, polymer viscosity (m) and percentage of wood content (W) were selected as the process or material factors to investigate the relationship between the flow characteristics and the above mentioned factors. Moreover, frequency sweep experiments were performed on the selected composites using rotational plate rheometer. The results from these experiments have been studied by using power law and Bingham plastic models which are believed as proper models for WPC in the literature. The results show that Bingham plastic model can explain the flow characteristics of this composite much better.  Moreover, although the results of a frequency sweep test can give the required values for parameters in the Bingham plastic model, these quantities will be different with those from empirical experiments.

کلیدواژه‌ها

Bingham plastic Model؛ Circular die؛ Extrusion؛ Flow؛ Power law Equation؛ Rotational rheometer؛ Wood plastic composite (WPC)

مراجع

[1]     Klyosov, A. A., “Wood-Plastic Composites”, Wiley Publication, New Jersey, 2007.

[2]     Tangram-Technology, “Wood Plastic Composites- A Technical Review of Materials, Processes and Applications”, Tangram Technology Ltd, 2004.

[3]     Pritchaed, G., “Wood Filled Plastics - The time has Come”, Plastic Engineering Europe, Vol. 3, No. 4, 2005, pp. 20-25.

[4]     Balasuriya, P. W., Ye, L. and Mai, Y. W., “Mechanical Properties of Wood Flake–polyethylene Composites. Part I: Effects of Processing Methods and Matrix Melt Flow Behaviour”, Composites Part A: Applied Science and Manufacturing, Vol. 32, No. 5, 2001, pp. 619-629.

[5]     Jam, N. J., Behravesh, A. H., “Challenge to the Production of Fine Wood-plastic Injection Molded Composite”, Journal of Reinforced Plastics and Composites, Vol. 28, No. 2009, pp. 73-82.

[6]     Soury, E., Behravesh, A. H., Esfahani, E. R. and Zolfaghari, A., “Design, Optimization and Manufacturing of Wood-plastic Composite Pallet”, Materials & Design, Vol. 30, No. 10, 2009, pp. 4183-4191.

[7]     Soury, E., Behravesh, A. H., Ghasemi-Nasrabadi, H. and Zolfaghari, A., “Design and Manufacture of and Extrusion Die for Wood Plastic Composite”, Journal of Reinforced Plastic and Composites, Vol. Published online, No. 2008.

[8]     Ku, H., Wang, H., Pattarachaiyakoop, N. and Trada, M., “A Review on the Tensile Properties of Natural Fiber Reinforced Polymer Composites”, Composites Part B: Engineering, Vol. 42, No. 4, 2011, pp. 856-873.

[9]     Zhou, G., Willett, J. L., Carriere, C. J. and Wu, Y. V., “Effect of Starch Granule Size on Viscosity of Starch-Filled Poly(hydroxy ester ether) Composites”, Journal of Polymers and the Environment, Vol. 8, No. 3, 2000, pp. 145-150.

[10]  Li, T. Q., Wolcott, M. P., “Rheology of Wood Plastics Melt, Part 1. Capillary Rheometry of HDPE Filled with Maple”, Polymer Engineering & Science, Vol. 45, No. 4, 2005, pp. 549-559.

[11]  Li, T. Q., Wolcott, M. P., “Rheology of Wood Plastics Melt, part 3: Nonlinear Nature of the Flow”, Polymer Engineering & Science, Vol. 46, No. 1, 2006, pp. 114-121.

[12] Adhikary, K. B., Pang, S. and Staiger, M. P., “Dimensional Stability and Mechanical Behaviour of Wood–plastic Composites Based on Recycled and Virgin High-density Polyethylene (HDPE)”, Composites Part B: Engineering, Vol. 39, No. 5, 2008, pp. 807-815.

[13] Golzar, M., Jam, N. J. and Behravesh, A. H., “Mathematical and Experimental Study on Flow of Wood Plastic Composite to Acquire its Constitutive Equation”, Journal of Reinforced Plastics and Composites, Vol. 31, No. 11, 2012, pp. 749-758.

[14]  Jam, N. J., Behravesh, A. H., “Flow Behavior of HDPE-Fine Wood Particles Composites”, Journal of Thermoplastic Composite Materials, Vol. 20, No. 5, 2007, pp. 439-451.

[15] Oromiehie, A., Faghihi, J., “Physical-Mechanical Properties of Polypropylene Filled with Wood Fibre, Rice-Husk, Bagasse”, Polymers from Renewable Resources, Vol. 1, No. 2, 2010, pp. 105-122.

[16] Shahi, P., Behravesh, A. H. and Daryabari, S. Y., “A Chalange to the Production of Wood Plastic Granules with Higher Mechanical Performance”, PPS Reginonal Meeting, Istanbul, 2010.

[17] Shakouri, E., Behravesh, A. H., Zolfaghari, A. and Golzar, M., “Effect of Die Pressure on Mechanical Properties of Wood—Plastic Composite in Extrusion Process”, Journal of Thermoplastic Composite Materials, Vol. 22, No. 6, 2009, pp. 605-616.

[18] Yildiz, Ü. C., Yildiz, S. and Gezer, E. D., “Mechanical Properties and Decay Resistance of Wood–Polymer Composites Prepared From Fast Growing Species in Turkey”, Bioresource Technology, Vol. 96, No. 9, 2005, pp. 1003-1011.

[19] Hristov, V., "Rheological Aspects of Wood Polymer Composites Extrusion " PHD Thesis of Chemical Engineering, Hamilton, McMaster University 2007, pp. 131 pages.

[20] Hristov, V., Vlachopoulos, J., “A Study of Viscoelasticity and Extrudate Distortions of Wood Polymer Composites”, Rheologica Acta, Vol. 46, No. 5, 2007, pp. 773-783.

[21]  Li, T. Q., Wolcott, M. P., “Rheology of Wood Plastics Melt, part 2: Effects of Lubricating Systems in HDPE/maple Composites”, Polymer Engineering & Science, Vol. 46, No. 4, 2006, pp. 464-473.

[22]   Jam, N. J., “Production of High Wood Content Wood-Plastic Composite Injection Molded Parts”, Master of Science, Department of Mechanical Engineering, Tehran, Tarbiat Modares University, 2007.

[23]   Marcovich, N., Reboredo, M., Kenny, J. and Aranguren, M., “Rheology of Particle Suspensions in Viscoelastic Media. Wood Flour-polypropylene Melt”, Rheologica Acta, Vol. 43, No. 3, 2004, pp. 293-303.

[24]   Hristov, V., Takacs, E. and Vlachopoulos, J., “Surface Tearing and Wall Slip Phenomena in Extrusion of Highly Filled HDPE/Wood Flour Composites”, Polym. Eng. & Sci., Vol. 46, No. 9, 2006, pp. 1204-1214.

[25]   Soury, E., Behravesh, A. H., Rizvi, G. M. and Jam, N. J., “Rheological Investigation of Wood-Polypropylene Composite in Rotational Plate Rheometer”, Journal of Polymers and the Environment, Vol. No. 2012.

[26]   Sadeghian, N., Golzar, M., “PVT Measurement System for Wood Plastic Composite Melt in an Extrusion Process”, Journal of Reinforced Plastics and Composites, Vol. 27, No. 7, 2008, pp. 739-750.

[27] Zolfaghari, A., Behravesh, A. H., Shakouri, E. and Soury, E., “An Innovative Method of Die Design and Evaluation of Flow Balance for Thermoplastics Extrusion Profiles”, Polymer Engineering & Science, Vol. 49, No. 9, 2009, pp. 1793-1799.

[28] Zolfaghari, A., Behravesh, A. H., Shakouri, E. and Soury, E., “Flow Balancing in Die Design of Wood Flour/HDPE Composite Extrusion Profiles with Consideration of Rheological Effect”, Polymer Engineering & Science, Vol. 50, No. 3, 2010, pp. 543-549.

[29]  Chhabra, R. P., Richardson, J. F., “Non-Newtonian Flow and Applied Rheology: Engineering Applications”, Butterworth-Heinemann, 2008.

[30]  Shenoy, A. V., “Rheology of filled Polymer Systems”, Kluwer, 1999.