Abstract: A plastic sealing element for dry cells includes a radially symmetrical, contrally perforated base element, the upper side of which is provided with an elastomeric sealing material which is extruded in the form of a circumferential annular bead, and a process for its manufacture. After the sealing element is pre-assembled with the cell's metal housing cover and the cell is assembled, the annular bead is pressed flat during final crimping so that a sealing zone having a small cross section and defining a long leakage path is developed between the cover and the base element, effectively preventing the leakage of electrolyte or water vapor, which is especially diffuse from the cell's porous carbon rod conductor, into the cell's sealing zone.

Abstract: An insulation sleeve for the can-shaped soluble anode of a round galvanic primary cell, which immobilizes emerging electrolyte and shields retained moisture from the exterior, and which electrically insulates the electrode conductor, includes a helically wound paper web having a plastic lining on one side and a lengthwise paper edge which is endlessly folded over, and which is wound onto a winding spindle so that the folded-over edge helically overlaps the opposite edge of the paper web to allow the superimposed plastic layers to be welded to one another in the overlapping zone. By successively winding a conventional paper strip with the plastic-lined paper web, an even stronger sleeve tube is obtained, which can then be cut into individual sleeves.

Abstract: A plastic sealing element for dry cells includes a radially symmetrical, centrally perforated base element, the upper side of which is provided with an elastomeric sealing material which is extruded in the form of a circumferential annular bead, and a process for its manufacture. After the sealing element is pre-assembled with the cell's metal housing cover and the cell is assembled, the annular bead is pressed flat during final crimping so that a sealing zone having a small cross section and defining a long leakage path is developed between the cover and the base element, effectively preventing the leakage of electrolyte or water vapor, which is especially diffuse from the cell's porous carbon rod conductor, into the cell's sealing zone.