화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.23, No.5, 681-689, September, 1999
Export Citation
장섬유 보강 나일론 복합재료의 사출성형시 공정조건이 미세구조에 미치는 영향
Effects of Processing Conditions of Injection Molding on the Microstructure of Long Fiber Reinforced Nylon Composites
박정훈, 김우년, 권익환1, 임순호2, †, 고문배2, 최철림2
  • 고려대학교 화학공학과
  • 1제일모직 화성연구소
  • 2한국과학기술연구원
Jung Hoon Park, Woo Nyon Kim, Ick-Hwan Kwon1, Soonho Lim2, †, Moon Bae Ko2, and Chul Rim Choe2
  • Department of Chemical Engineering, Korea University, Seoul, Korea
  • 1Chemicals Division R & D Center, Cheil Industries Inc., Hwang-sung, Korea
  • 2Polymer Hybrid Center, Korea Institute of Science and Technology, Seoul, Korea
E-mail:
초록
본 실험에서는 LNP사에서 제조한 장섬유 보강 나일론6 펠렛(Verton : PF-700-10HI)을 재료로 사출성형을 통해 복합재료를 제조하였다. 금형의 게이트에 따른 영향을 비교하기 위해, 작은 게이트 두께를 가진 금형과 큰 게이트 두께를 가진 금형이 사용되었다. 장섬유 보강 복합재료의 미세구조는 크게 코아 영역과 스킨 영역으로 나뉘어지는데 본 연구에서는 구분 기준으로 배향각 54.7도를 선택하여 임의성을 최소화하였다. 시편 내부의 섬유 길이와 배향은 보압이나 사출속도와 같은 공정조건에 영향을 받게 되며, 장섬유 보강 사출 성형시 보압이 증가함에 따라 섬유의 길이가 짧아지는 경향을 볼 수 있는데. 이러한 섬유파손에도 불구하고 보합에 따른 섬유의 배향성이 좋아져 기계
Long fiber reinforced nylon6 pellets (Verton, PF-700-10HI) were injection molded and the influence of the mold gate thickness was investigated. Microstructure of injection-molded long fiber reinforced thermoplastics(LFRTP) could be roughly subdivided into one core region and two skin regions. We established the criterion for division of th regions, which was 54.7 ℃ of orientation angle (θ). The fiber length and the fiber orientation in injection molded specimens were measured in order to investigate the influence by the processing creasing the holding pressure, the mechanical properties of the specimens were improved by the enhanced fiber orientation. An increase in holding pressure led to denser packing and increased the skin region. Also, a higher injection speed led to fiber breakage and decreased the skin region. The mechanical properties of injection molded specimens could be improved by increasing the holding pressure and decreasing the injection speed.
Keywords:long fiber reinforced thermoplastics;injection molding;fiber orientation;holding pressure;injection speed
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