Abstract: A method for manufacturing an airtight box from cardboard. The box has side wall panels and end wall panels. After a blank has been cut out, a flexible material strip is connected with the side wall panels and a number of end wall panels through adhesion. The material strip is attached to each of a number of other end wall panels while leaving clear two triangular portions not provided with adhesive which are located adjacent the free edges of the corresponding end panel. The blank is then erected to form a box through folding and adhesion with the adhesive being applied to the blank by at least one stamp. The stamp is of such design that the adhesive layer on the relevant end wall panel terminates at some distance from the edge of the adjacent end wall panel.