Experimental Investigation into Generation of Slip under conveying of Copper Foil

Abstract

In recent years, not only paper and plastic films but also metal foils have been increasingly transported and processed by roll-to-roll (RtoR), and depending on the transport speed and tension, wrinkles and slips can be occurred during transport. In order to elucidate the slip mechanism, we built an experimental machine that can vary the tension difference between the front and rear rollers while transporting the copper foil, calculated effective friction coefficients for each roller diameter and transport speed, and compared them with theoretical formulas. When the roller diameter is large, both results agree well, however when the roller diameter is small, the experimental values deviate from the theoretical values to a greater extent, and it was found that slipping is less likely to occur than the theoretical formulas.