likens that of fig2 but in addition in accordance with the invention each glue strip is replaced by one pair of glue tracks 30 which have a width b3 of 3 mm and are spaced at an interspacing b4 of 5 mm the glue tracks of adjacent adhering sides are again at a mutual distance b5 of 74 mm on the plate w2 similar glue tracks 31 are applied however in a centrally staggered manner the glue tracks nearest each other in a horizontal sense which are located at different plates are at a mutual distance which is equal to the corresponding distance in the glue pattern according to fig2 after pressing the glue tracks are each widened on both sides to 4 mm wide tracks with an interspacing of 4 mm when w1 and w2 with the glue pattern of fig3 are pulled away from each other the same effect is achieved as in fig2 at the location of the glue tracks 31 the plates w1 and w2 are kept attached to each other the areas located between the glue tracks of successive plates w1 and w2 again forming the inclined sides of the honeycomb cells however this same effect is achieved with much less glue in fig4 and 4a a schematic side view is shown of a.