Roll-to-Roll Manufacturing of Micropatterned Adhesives by Template Compression

• Main Authors: Dan Yu, Dirk Beckelmann, Michael Opsölder, Bruno Schäfer, Karsten Moh, René Hensel, Peter William de Oliveira, Eduard Arzt
• Format: Article
• Language: English
• Published: MDPI AG 2018-12-01
• Series: Materials
• Subjects: dry adhesive; microstructure; roll-to-roll fabrication; biomimetics
• Online Access: http://www.mdpi.com/1996-1944/12/1/97

For the next generation of handling systems, reversible adhesion enabled by micropatterned dry adhesives exhibits high potential. The versatility of polymeric micropatterns in handling objects made from various materials has been demonstrated by several groups. However, specimens reported in most studies have been restricted to the laboratory scale. Upscaling the size and quantity of micropatterned adhesives is the next step to enable successful technology transfer. Towards this aim, we introduce a continuous roll-to-roll replication process for fabrication of high-performance, mushroom-shaped micropatterned dry adhesives. The micropatterns were made from UV-curable polyurethane acrylates. To ensure the integrity of the complex structure during the fabrication process, flexible templates were used. The compression between the template and the wet prepolymer coating was investigated to optimize replication results without structural failures, and hence, to improve adhesion. As a result, we obtained micropatterned adhesive tapes, 10 cm in width and several meters in length, with adhesion strength about 250 kPa to glass, suitable for a wide range of applications.