Method for furnishing a sheet edge by a strip

A method to furnish an edge of an anode or cathode conductive sheet with a strip of plastic material using a device including a die space, the method comprising the steps of:

• providing the edge of the conductive sheet with holes to improve adhesiveness of the plastic strip to the conductive sheet,
• fitting the edge of the conductive sheet inside of the die space,
• feeding plastic material into the die space and around the sheet edge and into the holes which improves adhesiveness of the plastic strip to the conductive sheet,
• avoiding, by providing of restrictive organs and die surfaces about the die space, the escape of heated plastic material from the die space,
• moving the sheet in regard to the device with the sheet edge inside the die space of the device so that the plastic strip is adhered to the sheet edge,
• wherein the feeding step includes the step of heating the die space including the sheet edge during the moving step,
• wherein the fitting step includes the step of pre-heating the conductive sheet edge to a temperature at least 10-200° C. warmer than the temperature of the plastic material fed into the die space;
• and
• further including the step of cooling the strip and sheet edge so that the plastic material of outer strip surfaces of the strip cool and harden before plastic material of a spot of the strip immediately adjacent the sheet edge, wherein said cooling step further includes steering a cooling air flow only on the outer surface of the produced strip.