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광 경화성 수지를 이용한 파우더 기반의 3DP 공정 및 강도 특성
이원희(Wonhee Lee),김동수(Dongsoo Kim),김정수(Jungsu Kim),이택민(Taikmin Lee),신동윤(Dongyun Shin),이민철(Mincheol Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
3DP(three dimensional printing) technology is one of SFF(solid freeform fabrication) technologies which have recently come into a spotlight due to its adaptability to various applications. This technology has a great advantage in terms of short fabrication time for a prototype at a low cost, especially when it comes with multi-nozzle inkjet printing technology. However, it has also a disadvantage since it requires additional curing time, after jetting a binder material, and post-processing time in order to increase the mechanical strength of a product. In this study, a novel 3DP process is proposed to overcome slow solidification and elaborate post-process by adopting photo curing method into the conventional 3DP process. Mechanical properties, such as tensile and bending strengths, of specimens fabricated with the proposed 3DP process were measured and compared with those fabricated with the conventional 3DP process. As a result, it is found that mechanical strengths of specimens from the proposed novel 3DP process show over 10 times higher than those from the conventional 3DP process.
고평삼(Pyeongsam Ko),Nguyen Dang Thuan,권신(Sin Kwon),우규희(Kyoohee Woo),이택민(Taikmin Lee),Zhaoyang Zhong,윤홍석(Hongseok Youn) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.5
Polymer light-emitting diodes (PLEDs) have great potential toward next generation light source because of their flexibility, facile fabrication, and simple structure. However, the fabrication of low-cost PLEDs is still quite challenging, owing to the vulnerability of cathode and electron injection/transportation materials against the oxygen and moisture in the air. In this paper, we propose an all solution-processable polymer light-emitting diode structure and lamination method. Generally, electrode layers are formed by vacuum deposition; however, in this study, a solution-processed Ag film was developed and used as an electrode. The solution-processed Ag film was transferred to a polymer hot-melt film and then laminated onto the PLED layer. The laminated device exhibited good performances in turn-on voltage (5.0 V), brightness (2500 cd/m²) and current efficiency (0.6 cd/A), which were comparable to that of the evaporated device.