METHOD OF MANUFACTURING LEAD ALLOY SHEET FOR EXPANDED GRID, AND METHOD OF MANUFACTURING EXPANDED GRID FOR LEAD ACID BATTERY EMPLOYING THE LEAD ALLOY SHEET.

摘要

During manufacturing of a lead alloy sheet for an expanded grid in which a lead alloy sheet is unified with a base sheet by superimposing the lead alloy foil of different alloy composition from that of the base sheet on the base sheet comprising lead alloy and performing multiple cycles of a procedure of rolling the two materials by passage through gaps between pairs of mill rolls, a plurality of perforated holes that perforate the lead alloy foil in the thickness direction are interspersed throughout a leading end area established towards the leading end of the lead alloy foil, and the leading end area of the lead alloy foil in which the perforated holes have been interspersed is superimposed onto the leading end portion of the base sheet, and the base sheet and the lead alloy foil are supplied between mill rolls that perform the initial rolling. It is possible thereby to unify the base sheet and the lead alloy foil in a reliable manner, without a particularly high rolling rate in the rolling performed initially.