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Mass-producible Stepwise Thermal Patterning for Bio-inspired Dry Adhesives
Han Jun Park, Minsu Kim, Songyoung Lee, Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2025;42(10):833-841.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.D.25.00008

Dry adhesives inspired by gecko footpads have garnered considerable attention due to their unique features, including strong yet reversible adhesion, self-cleaning properties, and repeatable use. However, scaling these microstructured adhesives from laboratory fabrication to continuous, high-throughput manufacturing poses significant challenges. In this study, we introduce a stepwise thermal patterning system designed for the scalable production of gecko-inspired dry adhesives on flexible substrates. This automated system combines sequential processes such as plate-to-plate micro-molding, rapid thermal curing, demolding, and roll-up of the patterned film. By raising the curing temperature to approximately 180oC and employing an efficient stepwise imprinting method, we achieve fabrication speeds of up to 150 mm/min without compromising pattern accuracy. The system successfully replicates micropillar structures with a diameter of 15 μm and height of 15 μm, featuring 20 μm mushroom-shaped tips on flexible substrates. The resulting dry adhesives demonstrate stable pull-off strengths of 20-23 N/cm² and retain over 83.5% of their initial adhesion after 100,000 attachment–detachment cycles. These findings highlight the potential of our platform for reliable, high-throughput manufacturing of bio-inspired adhesives, paving the way for various industrial applications such as robotic manipulators, pick-and-place electronic assembly, and wearable devices that require repeated, residue-free attachment.

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A Case Study on Productivity Innovation through Convergence of Sand 3D Printing Technology
Kuk-Hyun Han, Jin-Wook Baek, Sang Yun Park, Tae Wan Lim, Ju Min Park
J. Korean Soc. Precis. Eng. 2021;38(9):651-657.
Published online September 1, 2021
DOI: https://doi.org/10.7736/JKSPE.021.073
Recently, competition in the manufacturing industry related to the preoccupation of new markets has drastically changed due to the increase in small quantity batch production products. Besides, business models utilizing 3D printing technology suitable for flexible manufacturing are gaining interest. As 3D printing technology is becoming more common, Design for Additive Manufacturing is also in the spotlight. However, the productivity of 3D printing technology is still insufficient in terms of mass production. In this study, the possibility of innovation in mass production process that combines 3D printing technology is presented through the case of innovation in manufacturing productivity of medium-speed engine cylinder head through the integration of sand 3D printing technology. It outlines how sand 3D printing technology is applied to cylinder head mass production processes, how the quality of cylinder head products can be improved compared to conventional pattern-based molding methods, and how productivity can be maximized by reducing process time and human error through hybrid production method with sand 3D printed integrated design cores. In conclusion, this paper presents the effectiveness of sand 3D printing technology which can secure product competitiveness by increasing the production capacity of mass production process, reducing production costs, improving quality, and reducing loss.

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  • Digital Transformation of Metal Casting Process Using Sand 3D Printing Technology with a Novel Methodology of Casting Design Inside a Core
    Kuk-Hyun Han, Jin-Wook Baek, Tae Wan Lim, Ju Min Park
    International Journal of Metalcasting.2023; 17(4): 2674.     CrossRef
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