Journal of the Korea Convergence Society (한국융합학회논문지)

Korea Convergence Society (한국융합학회)
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A Study on the PMMA Lens Fabrication for Surgical Light Based on Injection Molding Convergence Process

사출성형 융합공정 기반 수술실 무영등용 PMMA 렌즈 제작에 관한 연구

  • Kang, Bo-An (Department of Biomedical Engineering, Nambu University) ;
  • Oh, Hyeong-Jong (Department of Biomedical Engineering, Nambu University) ;
  • Jeong, Byeong-Ho (Department of Biomedical Engineering, Nambu University) ;
  • Jeong, Nam-In (Division of Research & Development, GNST Inc.)
  • Received : 2014.12.07
  • Accepted : 2015.02.20
  • Published : 2015.02.28
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Abstract

We studied on the injection molding conditions of defect-free PMMA lens for surgical light. When the heat temperature of mold is low, more imperfect molding or weldlines and flow marks have showed. A defective lens depends on low fluidity of the PMMA resin and its temperature is high, a flexural strain has occurred. The longer cooling time of specimens, the more cracks have occurred due to resin crystallization. In this study, optimal molding conditions for defect-free PMMA lens is as follows. The heat temperature of core mold was 110 [$^{\circ}C$] and also the cooling time was 25 [sec]. PMMA materials can realized low expense to produce plastic optical lens and applications.

본 연구는 수술실 무영등용 PMMA 렌즈를 무결함 상태로 사출성형하는 조건을 조사하였다. 렌즈 제작용 수지는 PMMA를 적용하였으며 금형은 자체 제작한 가열-냉각 방식의 금형을 사용하였다. 사출성형 시 금형의 가열온도가 낮을수록 플라스틱 수지의 유동성에 영향을 미쳐 미성형이 발생하거나 웰드 라인, 플로우 마크가 발생하고, 가열온도가 높으면 휨 변형이 발생하였다. 이러한 결함은 냉각시간이 길어짐에 따라 PMMA 수지 결정화에 기인하는 것으로 판단된다. 본 연구를 통해 PMMA 수지로 결함이 없는 렌즈를 성형하는 최적의 조건은 금형 코어의 가열온도는 110[$^{\circ}C$]였으며, 냉각시간은 25[sec]임을 밝혀내어 최적의 가열-냉각 온도 프로파일링을 확립하는 계기를 마련하였다. PMMA소재를 이용한 광학렌즈의 제작은 낮은 생산단가를 구현할 수 있으며 이로 인해 수술실 무영등에 적용된 플라스틱 광학렌즈에 적극 활용될 것으로 기대된다.

Keywords

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