Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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The effect of the injection molding conditions on the shrinkage of HIPS

사출성형조건이 HIPS 수축율에 미치는 영향

  • 차백순 (한국생산기술연구원 정밀금형팀) ;
  • 이병옥 (아주대학교 기계공학과) ;
  • 최권일 ((주) 브이엠테크) ;
  • 구본흥 ((주) 브이엠테크) ;
  • 박형필 (한국생산기술연구원 정밀금형팀, 아주대학교 기계공학과)
  • Published : 2005.10.01
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Abstract

The shrinkage of the product in injection molded part occurs due to the volume change with variation of temperature and pressure and is influenced by the processing conditions of injection molding. Mold designers greatly concerns the shrinkage of parts for a high dimensional accuracy. In this study, bar type HIPS specimen with 15x19 grid on the surface was tested. The amount of shrinkage of flow and transverse directions was examined with respect to the injection molding conditions such as melt temperature, injection speed, holding pressure, mold temperature and cooling time. As the packing pressure increased, the difference of shrinkage of both directions is decreased and the absolute shrinkage value also decreased.

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