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유리섬유가 첨가된 수지에서 사출성형품의 성형수축에 관한 연구
Investigation of the Part Shrinkage in Injection Molding for Class Fiber Reinforced Thermoplastics

모정혁   (서울산업대학교 대학원UU0000705  ); 류민영   (서울산업대학교 금형설계학과UU0000705  );
  • 초록

    The shrinkages of injection molded parts are different in molding operational conditions and mold design. It also differs from resins. The shrinkages of injection molded parts fur PBT (polybutylene terephthalate), PC (polycarbonate), and glass reinforced PBT and PC have been studied for various operational conditions of injection molding. The part shrinkage of crystalline polymer, PBT was higher than that of amorphous polymer, PC by about two times. The part shrinkages of both polymers decreased as glass fiber content increases. Higher injection temperature and lower injection pressure resulted in a higher shrinkage in both PBT and PC resins. As mold temperature increases the part shrinkage of PC decreased. However, the part shrinkage of PBT increased as mold temperature increases. The part shrinkages of PBT and PC resins decreased as gate size increases since the pressure delivery is mush easier for a larger gate size. The part shrinkage of flow direction was less than that of the perpendicular direction to the flow for both pure and glass fiber reinforced resins. The part shrinkage at the position close to the gate was less than that of the position far from the gate.


  • 주제어

    Injection Molding .   Part Shrinkage .   Injection Temperature .   Mold Temperature .   Injection pressure .   Glass Fiber .   Reinforced Resin.  

  • 참고문헌 (8)

    1. N. Shah, S. McCarthy and D. Colford, 1993 'Shrinkage and Filling Ultra-High Molecular Weight Polyethylene (UHMWPE)', ANTEC, 1599 
    2. F.W. Billmeyer, Jr., 1984, 'Textbook of Polymer Science', John Wiley & Sons, NY 
    3. S. Han and K.K. Wang, 1997 'Shrinkage Prediction for Slowly-Crystallizing Theromplastic Polymer in Injection Moulding', Intern. Polymer Processing, 12, p. 228 
    4. R. Pantani and G. Titimanlio, 1999 'Analysis of Shrinkage Development of Injection Moulded PS Samples', Intern. Polymer Processing, 16, p. 183 
    5. M. Fujiyama and T. Wakino, 1992 'Molecular Orientation in Injection-Molded Polypropylene Co-polymers with Ethylene', Intern. Polymer Processing, 7, p. 159 
    6. K.M.B. Jansen, D.J. van Dijk and E.V. Burgers, 1998 'Experimental Validation of Shrinkage Predictions for Injection Molded Products', Intern. Polymer rocessing, 8, p.99 
    7. 류민영, 모정혁, 정완진, 2003 '성형조건과 수지의 종류에 따른 사출 성형품의 성형 수축', 엘라스토머, Vol, 38, No.4, p. 295 
    8. Irvin I. Rubin, 1972 'Injection Molding, Theory and Practice', John Wiley & Sons, NY 
  • 이 논문을 인용한 문헌 (4)

    1. Lee, Min ; Kim, Hyeok ; Lyu, Min-Young 2012. "A Study on the Warpage of Glass Fiber Reinforced Plastics for Part Design and Operation Condition: Part 1. Amorphous Plastics" 폴리머 = Polymer (Korea), 36(5): 555~563     
    2. Lee, Mina ; Lyu, Min-Young 2013. "A Study on the Part Shrinkage in Injection Molded Annular Shaped Product for Glass Reinforced Polycarbonate" Elastomers and composites = 엘라스토머 및 콤포지트, 48(4): 300~305     
    3. Moon, Da Mi ; Choi, Tae Gyun ; Lyu, Min-Young 2014. "Prediction of Mechanical Property of Glass Fiber Reinforced Polycarbonate and Evaluation of Warpage through Injection Molding" 폴리머 = Polymer (Korea), 38(6): 708~713     
    4. 2015. "" Elastomers and composites = 엘라스토머 및 콤포지트, 50(3): 184~188     

 저자의 다른 논문

  • 모정혁 (1)

    1. 2003 "성형조건과 수지의 종류에 따른 사출 성형품의 성형 수축" 엘라스토머 = Elastomer 38 (4): 295~302    
  • 류민영 (14)

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