• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.34-37
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• 2004

In the present research, a ultra-precision diamond cutting of thermo-plastic materials, polycarbonate (PC) and cyclic olefin polymer (COC), is carried out by applying a method named ultrasonic elliptical vibration cutting developed by the authors. It is experimentally proved that good optical surfaces are obtained by applying the elliptical vibration cutting in cases of machining of flat surfaces and grooves as compared with the conventional diamond cutting. The maximum surface roughness in peak to valley value obtained is less than 60 nm and 20 nm for PC and ZEONEX, respectively.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.103-104
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• 2018

Recently, in addition to greening of roof and artificial soil, Rootproofing to prevent damage to the waterproof layer and structures by roots is recognized as an important task. Therefore, various related products and construction methods have been developed and applied in the field. However, in the case of synthetic polymer-based sheets most commonly used in domestic construction sites, Most are produced using 100% new materials that are not suitable for green trends such as resource conservation and environmental protection. Therefore, in this study, we developed TPO sheet using recycled material, which is a technology that can secure eco-friendliness by utilizing recycled resources. As a result of the evaluation of tensile performance of the TPO sheet according to the recycled material content, The tensile strength of the specimens with the recycled content of 50 ~ 70% was the highest, The elongation rate of the specimen with the recycled content of 30 ~ 40% was the best.