The purpose of this study was to develop a 3D mesh-type impact protection pad with excellent motion adaptability and functionality by applying 3D printing technology. The hexagonal 3D mesh, which constitutes the basic structure of the pad, comprises two types: small and large. The bridge connecting the basic units was designed as the I-type, V-type, IV-type, and VV-type. After evaluating the characteristics of the bridge, it was found that the V-type bridge had the highest flexibility and tensile elongation. The hip joint pad and knee pad were completed by combining the hexagonal 3D mesh structure with the optimal bridge design. The impact protection pad was printed using a fused deposition modeling-type 3D printer with a filament made of thermoplastic polyurethane material, and the protection pad’s performance was evaluated. When an impact force of approximately 6,500N was applied to the pad, the force attenuation percentage was 78%, and when an impact force of approximately 8,000N was applied, the force attenuation percentage was 75%. Through these results, it was confirmed that the 3D-printed impact protection pad with a hexagonal 3D mesh structure connected by a V-shaped bridge developed in this study can adapt to changes in the body surface according to movement and provides excellent impact protection performance.

Abstract
I. Introduction
II. Research Method
    1.Bridge design and characteristic evaluation of motion-adaptable  fall  impact  protection  pad
    2. Design of motion-adaptable fall impact protection pad
    3. Evaluation of the impact protection performance
III. Results and Discussion
    1.Bridge design and characteristic evaluation of motion-adaptable fall impact protection pad
    2. Evaluation of the impact protection performance
Ⅳ. Conclusion
References

• Junghyun Park(배재대학교 의류패션학과 조교수) | 박정현
• Jinsuk Lee(부산대학교 의류학과 강사) | 이진숙
• Jeongran Lee(부산대학교 의류학과 교수/부산대학교 생활환경연구소 겸임연구원) | 이정란 Corresponding author