FDM 3D printing structures have rough surfaces and require post-treatment to improve the properties. Fumigation is a representative technique for removing surface unevenness. Surface treatment by fumigation proceeds by dissolving the surface of the protruding structure using a vaporized solvent. In this study, 3D printed PVB outputs are surface-treated with ethyl-alcohol fumigation. As the fumigation time increases, the surface flattens as ethanol dissolves the mountains on the surface of PVB and the surface valleys are filled with dissolved PVB. Through the fumigation process, the mechanical strength tends to decrease, and deformation rate increases. Ethanol vapor permeates into PVB, widening the distance between chains and resulting in weak bonding strength between chains. In order to confirm the effect of fumigation only, an annealing process is performed at 80 oC for 1, 5, 10, 30, and 50 minutes and the results of the fumigation are compared.

Abstract
1.서 론
2. 실험 방법
3. 결과 및 고찰
5. 결 론
References

• 강은영(인하대학교 공학대학원/(주)대명테크놀로지) | Eun-Young Kang (Graduate School of Engineering, Inha University/Daemyoung Technology Co. Ltd)
• 임지호(인하대학교 신소재공학과) | Ji-Ho Lim (Department of Materials Science and Engineering, Inha University)
• 최승곤(인하대학교 신소재공학과) | Seunggon Choi (Department of Materials Science and Engineering, Inha University)
• 문종욱(인하대학교 기계공학과) | Jong Wook Mun (Department of Mechanical Engineering, Inha University)
• 이유경(인하대학교 기계공학과) | Yu Kyung Lee (Department of Mechanical Engineering, Inha University)
• 이선곤(인하대학교 기계공학과) | Sun Kon Lee (Department of Mechanical Engineering, Inha University) Corresponding author
• 정대용(인하대학교 공학대학원/인하대학교 신소재공학과) | Dae-Yong Jeong (Graduate School of Engineering, Inha University/Department of Materials Science and Engineering, Inha University) Corresponding author