Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on Properties of EPP Bead Foam

EPP 비드폼의 특성에 관한 연구

  • Jung, Dong-Won (Dept. of Mechanical Engineering, Jeju Nat'l Univ.) ;
  • Lee, Eung-Kee (Dept. of Materials Science and Engineering, Univ. of Toronto) ;
  • Park, Chul-B. (Dept. of Mechanical and Industrial Engineering, Univ. of Toronto)
  • 정동원 (제주대학교 기계공학과) ;
  • 이응기 (토론토대학교 재료과학공학과) ;
  • 박철범 (토론토대학교 기계산업공학과)
  • Received : 2010.12.13
  • Accepted : 2011.07.12
  • Published : 2011.09.01
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Abstract

This paper deals with the basic principles and procedures involved in the steam-chest molding process used for manufacturing expanded polypropylene (EPP) bead foam. Steam-chest molding is an integral process for EPP technology. However, little research has been carried out on the processing conditions for steam-chest molding this process. The characteristics of EPP foam are energy absorption, multiple-impact protection, low weight, structural strength, and durability. In this study, the steam pressure in steam-chest molding was varied to determine the optimum conditions for manufacturing EPP foam. Moreover, annealing was performed after EPP-foam molding to prevent the shrinkage of the steam-molded product. It was possible to verify the mechanism of foam shrinkage by observing the change in weight with time at different annealing temperatures. Moreover, a tensile test and scanning electron microscopy (SEM) analysis were performed to support these experimental results. The dimensional stability of each molded product was investigated at different steam pressures.

본 논문은 EPP 비드폼에 대한 증기실 조형공정의 기본 원리들과 과정들에 대해 다루고 있습니다. 증기실 조형은 EPP 기술을 위한 필수적인 공정입니다. 그러나 증기실 조형의 공정조건에 대해 연구가 거의 이루어져 있지 않습니다. EPP 폼의 특징들은 에너지흡수, 다양한 충격보호, 가벼운 무게, 구조상의 견고성과 내구성 등이다. 본 연구에서는 증기실 조형에서 증기압을 변화시켜 EPP 폼 제작을 위한 최적조건을 찾고자 노력하였으며, 무엇보다 증기조형 제품의 수축을 방지하기 위하여 EPP 폼 조형후 노내 가열을 수행하였다. 다른 노내 가열 온도들에서 시간에 따라 무게가 바뀌는 것을 관찰함으로써 폼수축의 메커니즘을 확인하는 것이 가능하였다. 인장시험과 SEM 해석을 수행하여 이들 실험결과들을 뒷받침할 수 있었고, 다른 증기압들에서 조형된 제품들에 대해 치수안정성을 조사하였다.

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