화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.41, No.1, 30-38, January, 2017
DOI10.7317/pk.2017.41.1.30  Export Citation
초박형 도광판의 고속 사출성형에서 충전 불균형에 대한 연구
A Study on the Filling Pattern Imbalance in High Speed Injection Molding Process for Thin Light Guide Plate
정태성†, 장진혁1, 김종선2
  • 인하공업전문대학 기계설계과
  • 1㈜ 코웨이
  • 2한국생산기술연구원
Tae-Sung Jung†, Jin-Hyeok Jang1, and Jong-Sun Kim2
  • Dept. of Mechanical Design, Inha Technical College, 100 Inha-ro, Nam-gu, Incheon 22212, Korea
  • 1Coway R&D Center, Coway Co., Ltd., Seoul National University Research Park, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
  • 2Korea Institute of Industrial Technology, #301-303 Bucheon Techno-Park, Ssangyoung3Cha, 397 Seokcheon-ro, Ojeong-gu, Bucheon city, Kyunggi-Do 14449, Korea
E-mail:
초록
본 연구에서는 성형해석과 실험을 통하여 초박형 도광판 사출성형에서의 충전 불균형 현상에 대하여 고찰하였다. 8인치, 0.6 mm 초박판 도광판에 대하여 유동계로 측정된 수지의 점도를 이용해 성형 해석을 수행하였다. 해석결과 사출된 수지가 제품부로 유입되기 전 단열가열, 전단가열에 의해 온도가 다른 내외부 영역으로 분리되며, 온도가 높은 외부 수지층은 제품 측면부로 흘러 들어가고, 상대적으로 온도가 낮은 내부 수지층은 제품 중앙부로 유입되면서 점도 차이로 인한 유동저항 차이를 발생시키는 것으로 분석되었다. 수지 온도, 사출 속도 등 실험 조건에 따라 미성형 실험 성형품의 충전 패턴을 해석 결과와 비교하였으며, 사출 속도와 사출 온도가 클수록 측면이 먼저 충전되는 경향이 커지는 결과를 얻었다.
In this study the filling pattern imbalance was investigated in the injection molding of thin light guide plate by the injection molding simulation and experiments. Injection molding simulation was conducted for thin 8 inch light guide plate (LGP) with 0.6 mm thickness using measured rheological characteristics of resin PC. It is observed that injected resin is heated by adiabatic heating and shear heating and divided into inner layer and outer layer with different temperature. Outer layer resin with high temperature flows into the side section of the cavity, and inner layer resin with relatively low temperature flows into the center section. Thermally separated flows are expected to cause the filling pattern imbalance with a difference in viscosity and flow resistance. Filling patterns of short-shot experiment results for injection speed and temperature were compared with the simulation results. Filling pattern imbalance showed a tendency to increase for higher injection speed and injection temperature.
Keywords:high speed injection molding;thin-wall;filling pattern imbalance;shear heating;viscosity
  1. Woo JW, Hong JS, Kim HK, Lyu MY, Polym. Korea, 40(2), 175 (2016)
  2. Jung TS, Kim JS, Ha SJ, Cho MW, Trans. Mater. Process, 23, 41 (2014)
  3. Chiang YC, Cheng HC, Huang CF, Lee JL, Lin Y, Shen YK, Int. J. Adv. Manuf. Technol., 55, 517 (2011)
  4. Yin S, Ruan F, Wang J, Adv. Mater. Res., 538, 1145 (2012)
  5. Tsai MH, Ou KL, Huang CF, Cheng HC, Shen YK, Chang CY, Wu CH, Chen JH, Guan P, Int. Commun. Heat Mass Transf., 35, 1097 (2008)
  6. Shen YK, Wu WY, Yang SY, Jian HM, Chen CCA, J. Reinf. Plast. Compos., 23, 1187 (2004)
  7. Feng C, Kuo J, Su TL, J. Mater. Eng. Perform., 16, 539 (2007)
  8. Chen SC, Liao WH, Yeh JP, Chien RD, Polym. Test, 31, 864 (2012)
  9. White JL, Principles of Polymer Engineering Rheology, John Wiley & Sons, 1990.
  10. Tadmor Z, Gogos CG, Principle of Polymer Processing, John Wiley & Sons, 1979.
  11. Terje T, Erik A, MekIT’07: 4th Natl Conf. on Computational Mechanics, S4104, Trondheim, 23-24 May (2007).