Abstract
Long flexible materials such as paper, optical film and metallic thin film are called web, which are made by Roll to Roll production system. In this production system web are transported under tension by a lot of rollers. High performance films such as fuel cell, printed electronics and solar cell are also made by Roll to Roll production system. So it's issue in the manufacturing field to improve productivity and prevent defects such as slippage and wrinkle. Today, engineers hope web is more thin to improve performance and wider to produce efficiently. However, web is occurred wrinkles on the roller easily due to such change although transported under very low tension. So engineers used concaved roller to prevent wrinkle. But there are very few papers written about preventing mechanism and limit of effect with concaved roller. This paper aims to clear preventing effect for wrinkle by concaved roller experimentally. We experimented wrinkle generation by four test rollers: cylindrical roller, it with micro-groove, concaved roller and it with micro-groove, and clear relation between concaved roller and wrinkle generation to compare each experimental results.
