Abstract: In a carton of the type wherein a supplemental reinforcing panel is disposed within the carton immediately rearwardly of the front panel, with the supplemental reinforcing panel being hingedly connected to a first bottom dust flap which is hinged to one of the carton side panels, and a second bottom dust flap is hinged to the other of the carton side panels, locking shoulders are provided on the bottom dust panels for engagement with locking slots on the carton bottom panel, thereby providing a double lock for the bottom panel to create a stronger box closure.

Abstract: A machine for forming cartons from pre-cut and pre-scored blanks comprising a carton blank storage and first feed subassembly for feeding blanks linearly from a stack thereof and which is adjustable to accommodate blanks of different lengths, widths and thicknesses; a second feed sub-assembly for accepting the blanks and including a pair of endless travelling belts for feeding the carton blanks linearly; a flap bending and glue or hot melt applicator subassembly for bending certain of the flaps upwardly and holding certain others of the flaps downwardly for applying glue or hot melt to said certain others of the flaps of certain blanks fed thereto, this subassembly being adjustable to accommodate blanks of different widths and lengths; and a forming subassembly including front and rear formers and side formers which together form a well which is adjustable to accommodate blanks of different widths and lengths, and a forming block which is movable and adjustable with the front and rear and side formers for acc