Abstract
The control of flow balance at the die exit is the key for successful extrusion of polymers. The complex cross-sectional variation in real-world hollow extrusion profiles intrinsically promotes flow imbalance in the die cavity. Special considerations are required for designing extrusion dies for such profiles. The die design for a complex door frame profile was computationally optimized in this study with the aid of a commercially available software package. The velocity distribution at the die exit, post-die extrudate deformation, temperature distribution, and pressure distribution of a traditional die was investigated in detail and found to be inadequate. A modified die incorporated three distinct features, flow restrictors, flow separators, and approach angle of the torpedoes, to achieve a balanced and uniform velocity at the die exit. The flow restrictors and flow separators were added in the pre-parallel zone. Flow restrictors were added on top and bottom of the torpedoes to increase the restriction on polymer flow. A unique inclined flow restrictor was introduced to achieve uniform internal melt flow. Flow separators were added at junctions of outer wall and inner vertical walls to separate the polymer flow into different sections and minimize cross flow between these sections. The addition of these features proved to be highly effective for balancing the velocity distribution at the die exit. The combination of 3-D modeling and simulation is a cost-effective and time efficient approach for optimizing complex die designs before manufacturing.
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References
Gonçalves ND, Teixeira P, Ferrás LL, Afonso AM, Nóbrega JM, Carneiro OS (2015) Design and optimization of an extrusion die for the production of wood–plastic composite profiles. Polym Eng Sci 55(8):1849–1855. https://doi.org/10.1002/pen.24024
Narayanasamy R, Srinivasan P, Venkatesan R (2003) Computer aided design and manufacture of streamlined extrusion dies. J Mater Process Technol 138(1):262–264. https://doi.org/10.1016/S0924-0136(03)00082-7
Hurez P, Tanguy PA, Blouin D (1996) A new design procedure for profile extrusion dies. Polym Eng Sci 36(5):626–635. https://doi.org/10.1002/pen.10450
Lee W-S, Ho H-Y (2000) Experimental study on extrudate swell and die geometry of profile extrusion. Polym Eng Sci 40(5):1085–1094. https://doi.org/10.1002/pen.11236
Shahreza AR, Behravesh AH, Jooybari MB, Soury E (2010) Design, optimization, and manufacturing of a multiple-thickness profile extrusion die with a cross flow. Polym Eng Sci 50(12):2417–2424. https://doi.org/10.1002/pen.21770
Pradeep ASE (2016) Design features and optimization of profile extrusion dies, p. 106. Open Access Master's Thesis, Michigan Technological University
Doworkin RD (1989) PVC Stabilizers of the past, present, and future. J Vinyl Technol 11(1):15–22. https://doi.org/10.1002/vnl.730110106
Mengeloglu F, Matuana LM, King JA (2000) Effects of impact modifiers on the properties of rigid PVC/wood-fiber composites. J Vinyl Addit Technol 6(3):153–157. https://doi.org/10.1002/vnl.10244
Kokta BV, Maldas D, Daneault C, Béland P (1990) Composites of poly (vinyl chloride) and wood fibers. Part II: Effect of chemical treatment. Polym Compos 11(2):84–89. https://doi.org/10.1002/pc.750110203
Cross MM (1965) Rheology of non-Newtonian fluids: a new flow equation for pseudoplastic systems. J Colloid Sci 20(5):417–437. https://doi.org/10.1016/0095-8522(65)90022-X
Williams ML, Landel RF, Ferry JD (1955) The temperature dependence of relaxation mechanisms in amorphous polymers and other glass-forming liquids. J Am Chem Soc 77(14):3701–3707. https://doi.org/10.1021/ja01619a008
Lenk RS (2012) Polymer rheology. Springer Science & Business Media
Hieber CA, Chiang HH (1992) Shear-rate-dependence modeling of polymer melt viscosity. Polym Eng Sci 32(14):931–938. https://doi.org/10.1002/pen.760321404
Summers JW, Rabinovitch EB, Quisenberry JG (1985) A scientific approach to rigid poly(vinyl chloride) extrusion. J Vinyl Technol 7(1):32–35. https://doi.org/10.1002/vnl.730070108
Cifuentes AO, Kalbag A (1992) A performance study of tetrahedral and hexahedral elements in 3-D finite element structural analysis. Finite Elem Anal Des 12(3):313–318. https://doi.org/10.1016/0168-874X(92)90040-J
Yu J, Sun L, Ma C, Qiao Y, Yao H (2016) Thermal degradation of PVC: a review. Waste Manag 48:300–314. https://doi.org/10.1016/j.wasman.2015.11.041
Nóbrega JM, Carneiro OS, Covas JA, Pinho FT, Oliveira PJ (2004) Design of calibrators for extruded profiles. Part I: Modeling the thermal interchanges. Polym Eng Sci 44(12):2216–2228. https://doi.org/10.1002/pen.20249
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The guidance and support provided by Coleen Mantini and Jennifer Laubach who oversee the program is greatly appreciated.
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The research was funded by the State of Pennsylvania through the PA Manufacturing Fellows Initiative (PMFI) and the Manufacturing PA Innovation Program.
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Xing, J., Alsarheed, M., Kundu, A. et al. Internal flow optimization in a complex profile extrusion die using flow restrictors and flow separators. Int J Adv Manuf Technol 119, 4939–4950 (2022). https://doi.org/10.1007/s00170-021-08306-6
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DOI: https://doi.org/10.1007/s00170-021-08306-6