• Title, Summary, Keyword: 엔지니어링 플라스틱

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Optimal and Durability Analysis of Engineering Plastics in Contact Situations (엔지니어링 플라스틱의 접촉문제 신뢰성 분석 및 최적화)

  • 최덕현;전지훈;황운봉;김명덕;김영수;조성진;박관룡
    • Proceedings of the Korean Reliability Society Conference
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    • pp.205-210
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    • 2002
  • 엔지니어링 플라스틱은 제품의 경량화 및 기계적 특성을 향상시키기 위해 다양한 분야에서 사용이 증가하고 있다. 엔지니어링 플라스틱이 접촉부재의 부품으로 교체될 때는 접촉부재와의 마멸 및 마찰 특성이 시스템 전체의 신뢰성에 큰 영향을 끼치게 된다. 또한 접촉부재의 일반적인 역할이 마찰력에 따른 동력의 전달 및 진동 감쇠와 같으므로 엔지니어링 플라스틱의 교체에 따른 시스템의 효율을 고려해야만 한다. 따라서 본 논문에서는 접촉부재를 엔지니어링 플라스틱으로 교체함에 따른 마멸 및 마찰 특성을 분석하여 접촉부재에서의 신뢰성을 분석해 보고, 접촉부재에서의 진동 감쇠 특성을 분석하여 엔지니어링 플라스틱의 교체에 관한 최적의 재료를 선정해 보고자 한다. 이를 통해, 여러 종류의 시스템에서 엔지니어링 플라스틱의 접촉부재 교체에 따른 신뢰성 향상 방안 및 최적화를 위한 기초 자료를 제공하고자 한다.

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Heat Transfer Characteristics of Plastic Particle Slurry in a Circular tube Flow (관내 유동 플라스틱 슬러리의 열전달 특성)

  • 김명환;김명준
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.3
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    • pp.451-456
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    • 2004
  • This present experimental study has dealt with the heat transfer characteristics of plastic particle slurry which flows in a circular tube. This type of slurry is suggested for heat transfer enhancement effect cause by random and vortex effect of plastic particle dispersed in water. As a result, the thermal boundary layer becomes thin so the heat transfer coefficient on the tube wall more increase compare to pure water flow. This experimental test section was composed with stainless pipe which has the length of 2000mm, inner pipe diameter of 14mm and outer pipe diameter of 60mm. The most effective and important parameter of this experiment is plastic packing factor(PPF). The focuses of these results are pressure drop and heat transfer coefficient. As results, the friction factor of plastic particle slurry becomes higher at laminar flow region than pure water because of buoyancy effect of plastic particle but the local heat transfer coefficient becomes higher.

The Effect on Mixed Ratio of Recycled Engineering plastic Resin on the Shrinkage in Molded Parts (엔지니어링 플라스틱 재료의 재활용 혼합비가 성형품 수축에 미치는 영향)

    • Resources Recycling
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    • v.13 no.3
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    • pp.43-49
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    • 2004
  • In this study. an experimental work was performed to mold tensile specimens by using the injection molding machine. Melt temperature, mold temperature and the mixed ratio of recycled resin were selected as processing parameters for studying the effect of those conditions on the shrinkage and weight of molded parts. As a result, the shrinkage was increased with the higher mold and melt temperature and it was more sensitive to the change of mold temperature. On the other hand, the weight of molded parts was decreased with the increment of mold and melt temperature.