From a manually loaded magazine, a laid blank is picked up by suction cups and deposited on side rails. A centering device pushes and positions it over the forming area. During this movement, special diffusers operated by an electropneumatic unit apply rows of hot-melt to the blank. Then a forming table, moving from top to bottom, passes it through a fixed hopper to form the case. This hopper, by folding the die-cut flaps in sequence, shapes the case. Finally, a pusher moves it to the machine outlet, ready with the top side still open for filling.