The MH-FJ-3A Carton Sealer with manual aadjusment and pneumatic flap-closing design. The machine automatically folds the four flaps on the top. The machine is suitable for being placed “in line”. The machine is suitble for serial closing of American folding boxes with tape on the top and/or underside. Professional finish guaranteed by pressure rollers for pushing flap openings togheter. The box is moved to the machine along side conveyor belts. Adjustment is easy and fast using the handles.