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IMD 공정 중 필름 변형 특성 파악을 위한 사출 및 필름성형 간 연계해석
윤종혁(J.H. Yoon),허남건(N. Hur),배아현(A.H. Bae),이태희(T.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회지 Vol.18 No.3
In various manufacturing industries, an in-mold decoration (IMD) process for plastic objects is widely utilized because a film forming and an injection molding processes run simultaneously. In the present study, the deformation of polymer film and filling of resin in the IMD process were numerically investigated to evaluate the quality of the plastic object formed by the IMD process, which consists of thermoforming and injection molding processes. To obtain the initial shape of the polymer film during the injection molding process, the deformation of the polymer film in the thermoforming process was pre-formed using the vacuum conditions to attach the film to a cavity. Since the properties and deformation of polymer film are greatly affected by the behavior of polymer resin being injected into a mold cavity, numerical simulations for the injection molding and film forming were performed with one-way coupling method. The results showed that the injected resin could lead to the tearing of the polymer film in local regions near the corners. In order to verify the proposed numerical methodology, the numerical results of the deformation patterns printed on the initial polymer film were compared with the experimental data. The proposed methodology to couple film forming analysis with injection molding analysis can be used to predict the deformation of film in IMD process.
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물체 모서리의 액막 뭉침 현상 완화를 위한 모서리 형상에 대한 수치해석 연구
이건강(G.K. Lee),이상혁(S.H. Lee),임기열(K.Y. Lim),배아현(A.H. Bae),허남건(N.K. Hur) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
It is important to predict the behavior of liquid film in painting process of small plastic objects. From this process, the film sagging phenomenon around the corners of object easily occurs due to the surface tension of liquid film. In the present study, the behavior of liquid film around the corners of object was numerically simulated for the prediction of film sagging phenomenon by using the VOF method. The behavior of liquid film was predicted with the density, viscosity and surface tension coefficient of liquid film obtained from the experiment. The numerical result of behavior of liquid film was in good agreement with experimental result. In order to decrease the film sagging phenomenon, the effect of geometric factor is also analyzed. From these simulations, the modified comer shape was obtained to reduce the film sagging phenomenon. The results of present study can be provided as useful information for improving the quality of painting process.
ScienceON
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