사출금형 안에서 코팅을 위한 충돌혼합에 관한 해석
Analysis of impingement mixing for coating in injection mold
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In-mold Coating is a method that can simultaneously perform injection molding and surface coating in injection mold. The material used for coating is two-component polyurethane which is composed of polyol and isocyanate. L-type mixing head can be used to mix polyol and isocyanate uniformly, and inject them inside the mold cavity. The surface quality of the injection molded products by using in-mold coating depends on the mixing uniformity between main agent and hardener. In this study, flow analysis was performed to design a mixing head for uniform mixing of two-component polyurethane. Especially the effects of design parameters of mixing head on mixing uniformity and nozzle pressure were investigated. The parameters of mixing head were mixing chamber diameter, cleaning cylinder diameter, nozzle alignment angle in the horizontal and vertical direction, and cleaning piston position. It was found that optimal design values were mixing chamber diameter of 3.5 mm, cleaning cylinder diameter of 5.0 mm, nozzle horizontal/vertical alignment angles of 140°/160°, and cleaning piston position of 1.8 mm. The optimal values would be used to develop a two-component mixing head achieving an uniform mixing for in-mold coating.
Abstract
In-mold Coating is a method that can simultaneously perform injection molding and surface coating in injection mold. The material used for coating is two-component polyurethane which is composed of polyol and isocyanate. L-type mixing head can be used to mix polyol and isocyanate uniformly, and inject them inside the mold cavity. The surface quality of the injection molded products by using in-mold coating depends on the mixing uniformity between main agent and hardener. In this study, flow analysis was performed to design a mixing head for uniform mixing of two-component polyurethane. Especially the effects of design parameters of mixing head on mixing uniformity and nozzle pressure were investigated. The parameters of mixing head were mixing chamber diameter, cleaning cylinder diameter, nozzle alignment angle in the horizontal and vertical direction, and cleaning piston position. It was found that optimal design values were mixing chamber diameter of 3.5 mm, cleaning cylinder diameter of 5.0 mm, nozzle horizontal/vertical alignment angles of 140°/160°, and cleaning piston position of 1.8 mm. The optimal values would be used to develop a two-component mixing head achieving an uniform mixing for in-mold coating.
참고문헌 (13)
- Gruber, M., "Integrated system for producing composites", KraussMaffei Technologies, US Patent, No. 0317893, ~ (2008)
- Lee, L. J., "Impingement mixing in reaction injection molding", Polym. Eng. Sci., 20(13), pp.868~874 (1980)
- Johnson, D. A., "The effect of geometrical parameters on the flow field of an opposed jet RIM mix head: equal flow and matched fluids", Can. J. Chem. Eng, 74(1), pp.40~48 (1996)
- Baser, S. A., "Jet impingement mixing in an L-type mixhead:comparison of mixing criteria", Polym. Eng. Sci., 33(24), pp.1611~1618 (1993)
- 김동미, "Experimental Study on the Processing Conditions of In- Mold Coating for Injection-Molded Plates", International Journal of Precision Engineering and Manufacturing, 17(10), pp.1333~1339 (2016), 한국정밀공학회
- "ANSYS CFX User’s Manual", ANSYS Inc., ~ (2010)
- Grotjans, H., "Wall functions for general application CFD codes", ECCOMAS, 1(2), pp.1112~1117 (1998)
- 김동미, "사출성형 평판의 인몰드코팅 공정조건에 관한 연구", 석사, 항공·기계설계학과, pp.2014
- Kim, S. W., "An analytical study on the mixing characteristics of two-component polyurethane", Proc. KSMTE Spring Conf., pp.131~ (2017)
- Tucker, C. L., "Impingement mixing -a fluid mechanical approach", SPE Tech., 24, pp.158~160 (1978)
- Jones, W. P., "The prediction of laminarization with a two-equation model of turbulence", Int. J. Heat Mass Transfer, 15, pp.301~314 (1972)
- Menter, F. R., "Two-equation eddy viscosity turbulence models for engineering applications", AIAA J., 32(8), pp.1299~1310 (1994)
- Gomes, N. M. O, "Real time control of mixing in reaction injection moulding", Chem. Eng. Res. Des, 105, pp.31~43 (2016)