Method for manufacturing a metallic porous sheet

A method for continuously manufacturing a metallic porous sheet consisting essentially of the steps of:

• a. uncoiling a coil of nonwoven porous sheet and a coil of mesh porous sheet, adhering said nonwoven and mesh porous sheets to each other by melting or with an adhesive, or layering said sheets on one another, and coiling the resultant layered sheet around a roller, said layered sheet consisting essentially of said of said nonwoven sheet and said mesh porous sheet;
• b. continuously uncoiling said layered sheet from said roller and making said layered sheet conductive;
• c. supplying said layered sheet horizontally into a plating tank through an opening therein;
• d. jetting plating liquid, at a flow rate of 50 to 200 m/min from a plating liquid supply nozzle positioned in an upper portion of said plating tank to a plating liquid receiving pipe positioned in a lower portion of said plating tank;
• e. forcibly applying the plating liquid onto said layered sheet in a direction substantially perpendicular thereto while said layered sheet is being fed horizontally between said plating liquid supply nozzle and said plating liquid receiving pipe;
• f. plating said layered sheet at a current density ranging from 100 to 400 A/m.sup.2 ;
• and
• g. coiling said layered sheet on which the metal has been deposited around a roller and
• wherein said plating liquid passes through at least one case inside said plating tank, said case containing ball shaped anodes, said case communicating with said plating liquid supply nozzle, and said layered sheet being made negatively conductive by passing it through conductive rollers disposed outside the opening of said plating tank.