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"Imprinting"

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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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Articles
Manufacturing Process for Highly Stable Thermal Imprinting Transparent Electrode Using IPL Sintering
Yunseok Jang
J. Korean Soc. Precis. Eng. 2025;42(1):75-78.
Published online January 1, 2025
DOI: https://doi.org/10.7736/JKSPE.024.119
This paper shows results of research on transparent electrode manufacturing processes using thermal imprinting and IPL technique. By using an IPL process instead of the existing heat sintering process, the sheet resistance value was reduced to about 1/ 10. Additionally, sintering time could be reduced from 1 hour to 1 ms. As a result of measuring the transmittance to determine the excellence of the transparent electrode produced in this way, it was confirmed that it had a high transmittance of 94.4% compared to the substrate with a very high bending stability compared to the existing ITO transparent electrode. These results show that the transparent electrode manufacturing method proposed in this study is very useful.
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Recent Research Trend of Micro Hot-Embossing
Seung-Hyun Lee, Jeongdai Jo, Kwang-Young Kim, Young-Man Choi
J. Korean Soc. Precis. Eng. 2018;35(11):1027-1034.
Published online November 1, 2018
DOI: https://doi.org/10.7736/KSPE.2018.35.11.1027
Micro hot-embossing is a powerful tool in the agile additive manufacturing industry. Its applications include optical components, micro-fluidic devices, MEMS, hydrophobic/hydrophilic surfaces, and energy harvesting devices. To overcome a drawback of low-process speed, the R2R process has been innovated, with novel embossing mechanisms and process optimization. Also, new materials beyond thermoplastic polymers have been applied to develop new devices, or enhance device performance. This review surveys recent progress in micro hot-embossing technology, in terms of new mold fabrication process, process innovation, and various applications.

Citations

Citations to this article as recorded by  Crossref logo
  • Manufacturing Process for Highly Stable Thermal Imprinting Transparent Electrode Using IPL Sintering
    Yunseok Jang
    Journal of the Korean Society for Precision Engineering.2025; 42(1): 75.     CrossRef
  • Finding Ways to Deform Fine Patterns Fabricated by UV Curable Resin
    Woo Young Kim, Su Hyun Choi, Seonjun Kim, Young Tae Cho
    Journal of the Korean Society for Precision Engineering.2020; 37(4): 291.     CrossRef
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Focused-Infrared-Light Assisted Roll-to-Roll Hot Embossing
Jeongdai Jo, Wooseop Kim, Kwang-Young Kim, Young-Man Choi
J. Korean Soc. Precis. Eng. 2017;34(3):199-203.
Published online March 1, 2017
DOI: https://doi.org/10.7736/KSPE.2017.34.3.199
Hot embossing techniques are used to engrave patterns on plastic substrates. Roll based hot embossing uses a heated roll for a continuous process. A heated roll with relief patterns is impressed on a preheated plastic substrate. Then, the substrate is cooled down quickly to prevent thermal shrinkage. The roll speed is normally very slow to ensure substrate temperature increase up to the glass transition temperature. In this paper, we propose a noncontact preheating technique using focused infrared light. The infrared light is focused as a line beam on a plastic substrate using an elliptical mirror just before entering the hot embossing roll. The mid range infrared light efficiently raises the substrate temperature. For preliminary tests, substrate deformation and temperature changes were monitored according to substrate speed. The experiments show that the proposed technique is a good possibility for high speed hot embossing.

Citations

Citations to this article as recorded by  Crossref logo
  • Manufacturing Process for Highly Stable Thermal Imprinting Transparent Electrode Using IPL Sintering
    Yunseok Jang
    Journal of the Korean Society for Precision Engineering.2025; 42(1): 75.     CrossRef
  • Study of a Line‐Patterning Process Using Impact Print‐Type Hot Embossing Technology
    Myeongjin Kim, Jaewon Ahn, Junseong Bae, Donghyun Kim, Jongbum Kim, Jonghyun Kim, Dongwon Yun
    Advanced Engineering Materials.2020;[Epub]     CrossRef
  • Variation of a Triangular Pattern Shape due to Shrinkage in the Repeated UV Imprint Process
    Jiyun Jeong, Su Hyun Choi, Young Tae Cho
    Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(7): 67.     CrossRef
  • Recent Research Trend of Micro Hot-Embossing
    Seung-Hyun Lee, Jeongdai Jo, Kwang-Young Kim, Young-Man Choi
    Journal of the Korean Society for Precision Engineering.2018; 35(11): 1027.     CrossRef
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  • Crossref