A method for manufacturing an expandable cell structure comprising at least one structural layer comprising cell layers and at least one first boundary layer, wherein the cell layers form cell walls of the expanded cell structure (10', 10"), wherein the cell walls comprise longitudinal and intermediate webs extending between two adjacent parallel longitudinal webs, and wherein in the at least one non-expanded structural layer all the cell layers are in contact with one another, wherein the at least one structural layer in an expansion direction, perpendicular to the extent of the at least one structural layer in width, is expandable from a flat state to a structural layer in the expanded state in such a way that the intermediate webs straighten up with respect to the longitudinal webs, wherein a. in a first process step, a plurality of endless cell layers are supplied one above the other as continuous webs (122, 122') extending over the width perpendicular to the direction of expansion for forming the longitudinal webs and as strips (132, 132' for forming the intermediate webs are supplied one above the other, which strips have only the width of the intermediate webs plus a connecting flap on each side, by means of which the intermediate webs are connected to the longitudinal webs in a joining zone 8) to the longitudinal webs, wherein the cell layers for forming the longitudinal webs are joined in each case in the region of the joining zone to the cell layers for forming the intermediate webs, b. in a second process step, the webs (122, 122') and strips (132, 132') are joined to one another in the area of the joining zones in such a way that a hinge to the intermediate web is directly adjacent to each of the joining zones, c. in a third process step, structural layers are cut from the cell layers connected at the joining zones, wherein the length of the sections of the structural layers corresponds to a wall height of the cell structure (10, 10', 10") and d. in a fourth process step, the at least one first boundary layer is supplied in a discontinuous manner and a section is separated to terminate a cell structure. a. in a first process step, a plurality of endless cell layers are supplied one above the other as continuous webs (122, 122') extending over the width perpendicular to the direction of expansion for forming the longitudinal webs and as strips (132, 132' for forming the intermediate webs are supplied one above the other, which strips have only the width of the intermediate webs plus a connecting flap on each side, by means of which the intermediate webs are connected to the longitudinal webs in a joining zone 8) to the longitudinal webs, wherein the cell layers for forming the longitudinal webs are joined in each case in the region of the joining zone to the cell layers for forming the intermediate webs, b. in a second process step, the webs (122, 122') and strips (132, 132') are joined to one another in the area of the joining zones in such a way that a hinge to the intermediate web is directly adjacent to each of the joining zones, c. in a third process step, structural layers are cut from the cell layers connected at the joining zones, wherein the length of the sections of the structural layers corresponds to a wall height of the cell structure (10, 10', 10") and d. in a fourth process step, the at least one first boundary layer is supplied in a discontinuous manner and a section is separated to terminate a cell structure.