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유한요소해석을 통한 사출 성형된 도광판의 마이크로 패턴 전사성 예측
홍석관(S. K. Hong),강정진(J. J. Kang),윤경환(K. H. Yoon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Replication ratio of microfeatures on an injection-molded light guide plate (LGP) has a major influence on optical quality of a backlight unit (BLU). As the replication ratio of micro-feature is higher, the optical performance of BLU would be close to the design value. In order to investigate the optimal injection molding condition for LGP, a numerical study on the filling behavior of polymer melt was performed using finite element method. Simulation procedure consists of two steps. First, the pressure and temperature history data were exported from the macroscale flow simulation in which numerical domain is considered as 7 inch LGP geometry without microfeatures. Next, microscale flow simulation was performed using these data as boundary conditions. Microscale domain contains single cylindrical microfeature with a diameter of 30 ㎛ and a height of 14 ㎛ and nickel stamper with a thickness of 0.5 mm. Numerical results showed that predicted final height of microfeature and filling time at different positions agreed well with the experimental data.
DFSS 기법을 이용한 RTP 성형기의 대면적 전사성 향상
홍석관(S. K. Hong),김흥규(H. K. Kim),허영무(Y. M. Heo),강정진(J. J. Kang) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
RTP (rapid thermal pressing), one of micro-pattern replication techniques like hot embossing, is focused on achieving shorter cycle time. DFSS(Design for Six Sigma) has been applied in order to enhance the completeness of the development process for RTP system. According to DIDOV roadmap, we derived design concepts and subsequently decided the main performances, design factors, and components for RTP system. In the design process of RTP system using finite element analysis, it was realized that its structural characteristics affect large area replicability. Optimizing structural design factors, based on CAE, it was checked out that its large area replicability could be improved in a virtual test. Finally, we have a plan to validate the large area replicability of the developed RTP system, by performing micro-pattern replication tests with polymeric sheets.