METHOD FOR MANUFACTURING LEAD ALLOY SHEET FOR EXPANDED GRID, AND METHOD FOR MANUFACTURING EXPANDED GRID FOR LEAD BATTERY USING LEAD ALLOY SHEET

摘要

With the present invention, in the manufacture of a lead alloy sheet for an expanded grid wherein a lead alloy foil having an alloy composition different from a base material sheet comprising a lead alloy is overlaid on the base material sheet and a process is performed multiple times whereby these are rolled by passing through a gap between a pair of mill rolls, thereby integrating a lead alloy sheet with the base material sheet, multiple through-holes that penetrate the lead alloy foil in the thickness direction are dispersed in a front-end region that is set near the front end of the lead alloy foil, and with the front-end region of the lead alloy foil in which the through-holes have been dispersed overlaid on the front-end part of the base material sheet, the base material sheet and the lead alloy foil are supplied between mill rolls for performing the initial rolling. Thus, the base material sheet and the lead alloy foil can be integrated reliably without setting a particularly large reduction ratio in the initially performed rolling process.