Flow Direction When Fan Shaped Geometry is Applied in Gas-Assisted Injection Molding: 2. Development of Flow Model and its Predictions

Kwang-Hee Lim; Soo Hyeun Hong

Korean Journal of Chemical Engineering, Vol.21, No.1, 59-68, January, 2004

Kwang-Hee Lim^†, and Soo Hyeun Hong

Department of Chemical Engineering, Daegu University, Kyungsan, Kyungbook 712-714, Korea

E-mail:

In part 2 of the paper simplified unsteady-mass (and momentum-) balance equations of melt polymer resin in the cavities of GAIM were proposed, as a time-dependent rule of thumb, to constitute a novel flow model in GAIM under the configuration of two fan-shaped geometries connected with a gas nozzle. Upon performing a simulation on them with commercial software (MOLDFLOW), we compared the time evolution of simulated gas penetration lengths with the those of unsteady trajectory on the gas flow in GAIM by the suggested novel flow model in the fan-shaped cavities in order to check the precision of model-predicted gas penetration lengths as well as the consistency of its predicted direction. The results by the suggested novel flow model were satisfactory to fit the trajectory simulated with commercial software (MOLDFLOW).

Keywords:Gas-Assisted Injection Molding;Rule of Thumb;Preferred Direction of Gas;Novel Flow Model;Trajectory of Gas Flow;Gas Penetration

[References]

Chen SC, Cheng NT, Hsu KS, Int. Commun. Heat Mass Transf., 22, 319 (1995)
Chen SC, Cheng NT, Hsu KS, Int. J. Mech. Sci., 38, 335 (1996)
Chen SC, Hsu KF, Hsu KS, Int. J. Heat Mass Transf., 39(14), 2957 (1996)
Chen SC, Cheng NT, Chao SM, Int. Polym. Process., 14, 90 (1998)
Gao DM, Nguyen KT, J. Mater. Process. Technol., 69, 282 (1997)
Gauri V, Koelling KW, J. Non-Newton. Fluid Mech., 83(3), 183 (1999)
Huzyak PC, Koelling KW, J. Non-Newton. Fluid Mech., 71(1-2), 73 (1997)
Khayat RE, Derdouri A, Hebert LP, J. Non-Newton. Fluid Mech., 57(2-3), 253 (1995)
Kolb WB, Cerro RL, Chem. Eng. Sci., 46(9), 2181 (1991)
Lim KH, Lee EJ, Korean J. Chem. Eng., 20(3), 592 (2003)
Lim KH, Soh YS, J. Injection Molding Technol., 3, 31 (1999)
Lim KH, Korean J. Chem. Eng., 21(1), 48 (2004)
McCabe WL, Smith JC, Harriot P, "Unit Operations of Chemical Engineering," 4th Ed., McGraw-Hill, Press (1986)
Parez MA, Ong NS, Lam YC, Tor SB, J. Mater. Process. Technol., 121, 27 (2002)
Poslinski AJ, Oehler PR, Stokes VK, Polym. Eng. Sci., 35(11), 877 (1995)
Shen YK, Int. Commun. Heat Mass Transf., 24, 295 (1997)
Shen YK, Int. Commun. Heat Mass Transf., 28, 139 (2001)
Soh YS, Lim KH, SPE ANTEC Tec. Papers, 60, 482 (2002)

[Referenced By]

[Related Articles]

[1] Chen SC, Cheng NT, Hsu KS, Int. Commun. Heat Mass Transf., 22, 319 (1995)

[2] Chen SC, Cheng NT, Hsu KS, Int. J. Mech. Sci., 38, 335 (1996)

[3] Chen SC, Hsu KF, Hsu KS, Int. J. Heat Mass Transf., 39(14), 2957 (1996)

[4] Chen SC, Cheng NT, Chao SM, Int. Polym. Process., 14, 90 (1998)

[5] Gao DM, Nguyen KT, J. Mater. Process. Technol., 69, 282 (1997)

[6] Gauri V, Koelling KW, J. Non-Newton. Fluid Mech., 83(3), 183 (1999)

[7] Huzyak PC, Koelling KW, J. Non-Newton. Fluid Mech., 71(1-2), 73 (1997)

[8] Khayat RE, Derdouri A, Hebert LP, J. Non-Newton. Fluid Mech., 57(2-3), 253 (1995)

[9] Kolb WB, Cerro RL, Chem. Eng. Sci., 46(9), 2181 (1991)

[10] Lim KH, Lee EJ, Korean J. Chem. Eng., 20(3), 592 (2003)

[11] Lim KH, Soh YS, J. Injection Molding Technol., 3, 31 (1999)

[12] Lim KH, Korean J. Chem. Eng., 21(1), 48 (2004)

[13] McCabe WL, Smith JC, Harriot P, "Unit Operations of Chemical Engineering," 4th Ed., McGraw-Hill, Press (1986)

[14] Parez MA, Ong NS, Lam YC, Tor SB, J. Mater. Process. Technol., 121, 27 (2002)

[15] Poslinski AJ, Oehler PR, Stokes VK, Polym. Eng. Sci., 35(11), 877 (1995)

[16] Shen YK, Int. Commun. Heat Mass Transf., 24, 295 (1997)

[17] Shen YK, Int. Commun. Heat Mass Transf., 28, 139 (2001)

[18] Soh YS, Lim KH, SPE ANTEC Tec. Papers, 60, 482 (2002)