# 회전성형 제품의 품질 개선을 위한 연구

• 이정기 (홍익대학교 기계정보공학과) ;
• 한희덕 (홍익대학교 대학원 기계정보공학과) ;
• 김현주 (로모테크(주) ［구:즐거운아이들)
• Published : 2004.06.01
• 50 11

#### Abstract

Rotational molding is a plastics processing technique that is ideally suited to producing relatively large, hollow, seamless parts which are partially or totally enclosed. Designers of plastic parts turn to rotational molding to produce small or large parts of unusual shape that cannot be produced as one piece by other processes, e.g., blow molding and thermoforming. In this paper, in order to enhance the quality of rotational molding plastic products, 1) surface features for the plastic products are characterized by using an image analysis system, 2) maximum tensile strength for the plastic products that are made of materials that consist of Samsung-Atofina R90lU, pigments and two different kinds of calcium carbonate (OMYA CaCO$_3$) is measured and compared with each other by using an Instron universal testing machine, 3) thickness for the plastic products is non-destructively measured to investigate the quality of the plastic products by using an A-scan ultrasonic tester.

#### Keywords

Rotational Molding;Surface Image Test;Tensile Test;Ultrasonic Testing Method

#### References

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2. James, M. G., 2002, Mechanics of Materials, 5th Ed., Kyobobook, Seoul, pp. 13-28
3. Lee, J. G., 1999, 4400 Series Manual, INSTRON KOREA Inc.
4. American Society for Testing and Materials, 1990, Annual Book of ASTM Standards, Vol. 08.01., ASTM Intl.