Simulation of Cavity Filling and Curing in Reaction Injection Molding
Reaction injection molding1 is polymerization and processing in a single cyclic operation. It consists of several distinct processes. Reservoirs of one, two, or more components are metered according to a pre-determined ratio and then conveyed under pressure to a mixing head. The fluids are either mixing activated in the head or thermally activated upon injection into the mold cavity. Considerable viscosity increase can occur during cavity filling, the extent depending on the fill time and resin reactivity. Most of the chemical conversion usually occurs during the mold curing step after the mold has been filled. The part is ejected after some fixed mold residence time which allows the part to attain dimensional stability. The cycle time includes the time for cavity filling, mold curing, and mold preparation and it is often desirable for it to be a minimum. Excessive cycle times due to long cure times may eliminate or limit the use of a molding resin in a particular application.
KeywordsCycle Time Time Increment Reactive Fluid Mold Wall Chemical Conversion
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- 4.J. E. Welch, F. H. Harlow, J. P. Shannon and B. J. Daly, U. S. Govt, Report (NTIS LA-3425) (1966).Google Scholar
- 5.A. A. Amsden and F. H. Harlow, U. S. Govt. Report (NTIS LA-4370) (1970).Google Scholar
- 6.C. F. Huang, Ph.D. Thesis, Stevens Institute of Technology, Dept. of Chemical Engineering (1978).Google Scholar
- 8.B. Carnaham, H. A. Luther and J. A. Wilkes, Applied Numerical Methods, John Wiley & Sons, Inc., New York, 1969, p. 432.Google Scholar
- 9.A. H. P. Skelland, Non-Newtonian Flow and Heat Transfer, Wiley (1967).Google Scholar
- 10.J. M. Castro and C. W. Macosko, S.P.E. Technical papers, ANTEC, New York, NY, May, 1980 (p. 434).Google Scholar
- 11.K. M. Hollands and I. L. Kainin, Adv. in Chem. Ser. No. 92, 60, American Chemical Spciety, Washington, DC (1970).Google Scholar
- 12.Z. Tadmor, J. Appl. Polym. Sci., 18, 1753 (1974).Google Scholar
- 16.T. E. Stonecypher, E. L. Mastin Allen and D. A. Willougby, Chem. Eng. Prog. Symp. Series 62, 7 (1966).Google Scholar