Abstract: A sheet electrode with a predetermined thickness for an electric double layer capacitor is made by carrying out a roller rolling step in which a long sheet intermediate is made from a material containing a carbonaceous powder, a conductive assistant and a binder and thereafter. The sheet intermediate is passed between a pair of rolling rollers to be wound up by a winding section while being drawn out of a drawing section. The roller rolling step includes drawing the sheet intermediate out of the drawing section under a predetermined tension applied to the sheet intermediate, and controlling a widthwise position of the sheet intermediate immediately before the rolling rollers by an edge position controller, and winding the sheet intermediate rolled by the rollers onto a winding section while the winding section is applying a predetermined pressure to a rolling side drive roller located adjacent to the winding section and rotated at a predetermined speed.

Abstract: A container for containing a long article wound on a bobbin into a roll and having both widthwise ends includes a container body having at least one end formed with an opening, a cover closing the opening of the container body, a sealing member sealing a gap between the container body and the cover, an stem fixed to either the container body or the cover so that the bobbin is mounted on the stem, a bobbin fixing unit for fixing the bobbin, and a holding unit for holding the article wound on the bobbin so as to prevent the article from being detached from the bobbin by pressing both widthwise ends of the article wound on the bobbin.