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http://dx.doi.org/10.7736/KSPE.2016.33.1.31

Influences of Polyurethane Nozzle Shape on Mixing Efficiency  

Kim, Do Yeon (Precision Manufacturing & Control R&D Group, Korea Institute of Industrial Technology)
Lee, Tae Kyung (Precision Manufacturing & Control R&D Group, Korea Institute of Industrial Technology)
Jeong, Hae Do (Department of Mechanical Engineering, Pusan National University)
Kim, Hyoung Jae (Precision Manufacturing & Control R&D Group, Korea Institute of Industrial Technology)
Publication Information
Journal of the Korean Society for Precision Engineering / v.33, no.1, 2016 , pp. 31-35 More about this Journal
Abstract
For reaction injection molding (RIM) polyurethane was mixed in the mixing head by impingement mixing, injected into the mold, and cured quickly, as soon as the mold is filled. The shape of the nozzle in the mixing head is critical to improve the quality of polyurethane. To achieve homogeneous mixing, an intensive turbulence energy in the mixing nozzle is essential. In this study, a mixing nozzle for RIM was designed, and mixing efficiency was investigated based on experiment. Experiments were conducted with different combinations of nozzle tips and exit diameter to measure the mixing efficiency by measuring jet force and investigating mixing image with high speed camera. Jet force increased gradually and reaches steady state conditions. The jet force depended on shape of nozzle tip and outlet sizes. These results suggest that optimized nozzle configurations are necessary for high efficiency mixing with RIM.
Keywords
Reaction injection molding; Mixing head; Mixing nozzle;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Nguyen, L. T. and Suh, N. P., "Processing of Polyurethane/Polyester Interpenetrating Polymer Networks by Reaction Injection Molding. Part Ii: Mixing at High Reynolds Numbers and Impingement Pressures," Polymer Engineering & Science, Vol. 26, No. 12, pp. 799-842, 1986.   DOI
2 Nguyen, L. T. and Suh, N. P., "Processing of Polyurethane/Polyester Interpenetrating Polymer Networks by Reaction Injection Molding. Part III: Flow Reorientation through Multiple Impingement," Polymer Engineering & Science, Vol. 26, No. 12, pp. 843-853, 1986.   DOI
3 Santos, R. J., Erkoc, E., Dias, M. M., and Lopes, J. C. B., "Dynamic Behavior of the Flow Field in a Rim Machine Mixing Chamber," AIChE Journal, Vol. 55, No. 6, pp. 1338-1351, 2009.   DOI
4 Youn, J. W. and Kim, H. S., "A Study on Foaming Characteristics of Polyurethane Reaction Injection Molding Using Cup Foam Test," Proc. of KSTP Autumn Conference, pp. 106-109, 2008.
5 Kwon, J. W. and Lee, D. G. "Cure Monitoring for Prototyping of Reaction Injection Molding," Proc. of KSPE Spring Conference, pp. 32-36, 2001.
6 Lee, H. S. and Kim, D. M., "A Study on Mixing Characteristics of Two-Component Polyurethane for In-Mold Coating," J. Korean Soc. Precis. Eng., Vol. 30, No. 3, pp. 317-323, 2013.   DOI
7 Rho, B. J., Jeung, W. T., Lee, S. J., and Kim, S. M., "Flow Characteristics of High Pressurized Jet with Aspect Ratio," Proc. of KSME Autumn Conference, pp. 717-722, 2003.
8 Santos, R. J., Teixeira, A. M., and Lopes, J. C. B., "Study of Mixing and Chemical Reaction in Rim," Chemical Engineering Science, Vol. 60, No. 8, pp. 2381-2398, 2005.   DOI
9 Kolodziej, P., Macosko, C. W., and Ranz, W. E., "The Influence of Impingement Mixing on Striation Thickness Distribution and Properties in Fast Polyurethane Polymerization," Polymer Engineering & Science, Vol. 22, No. 6, pp. 388-392, 1982.   DOI
10 Erkoç, E., Santos, R. J., Nunes, M. I., Dias, M., and Lopes, J. C. B., "Mixing Dynamics Control in Rim Machines," Chemical Engineering Science, Vol. 62, No. 18, pp. 5276-5281, 2007.   DOI
11 Santos, R., Teixeira, A., Costa, M., and Lopes, J., "Operational and Design Study of Rim Machines," International Polymer Processing, Vol. 17, No. 4, pp. 387-394, 2002.   DOI
12 Santos, R. J., Erkoc, E., Dias, M. M., Teixeira, A. M., and Lopes, J. C. B., "Hydrodynamics of the Mixing Chamber in Rim: Piv Flow-Field Characterization," AIChE Journal, Vol. 54, No. 5, pp. 1153-1163, 2008.   DOI
13 Tucker, C. L. and Suh, N. P., "Mixing for Reaction Injection Molding. I. Impingement Mixing of Liquids," Polymer Engineering & Science, Vol. 20, No. 13, pp. 875-886, 1980.   DOI
14 Tucker, C. L. and Suh, N. P., "Mixing for Reaction Injection Molding. II. Impingement Mixing of Fiber Suspensions," Polymer Engineering & Science, Vol. 20, No. 13, pp. 887-898, 1980.   DOI
15 Nguyen, L. T. and Suh, N. P., "Processing of Polyurethane/Polyester Interpenetrating Polymer Networks by Reaction Injection Molding (Rim). Part I: Design of a High Pressure Rim System," Polymer Engineering & Science, Vol. 26, No. 12, pp. 781-798, 1986.   DOI