Abstract: A releasable locking lid formed from a planar blank of paperboard material which is adapted to fit a locking style box and which can be formed using automated paperboard folding equipment. Fold lines are provided in selected locations in the paperboard blank to define a top wall and two pair of opposing side walls surrounding the top wall. Each of one pair of side walls are configured to form a double ply in the final form and include a pair of cut-out portions which form recesses on the inner side of the double ply side wall which mate with corresponding flaps provided on the box to releasably lock the lid on the box. The double ply side walls also include a flap portion on each end adapted to mate with a diagonally folded flap on the ends of the other pair of opposing side walls. These flaps are adhesively bound together to connect the side walls to one another.

Abstract: An octagonal box structure comprises eight upstanding side wall panels and eight closure flaps integrally connected to one another and closing an end of the box structure. The side wall panels include four smaller panels having a width dimension of about 20 to 40 percent of the width dimension of the narrowest pair of the remaining four side wall panels. The closure flaps have a width corresponding to the width of the side wall panel from which they depend. Four of the closure flaps include diagonally extending score hinge lines to permit each of the these closure flaps to fold inwardly in partial overlapping relationship upon itself and the next adjacent closure flap. The diagonal score lines are formed at an angle between about 20 to 25 degrees relative to an extension of the vertical score lines which define the width of each closure flap. Also disclosed is an apparatus for quickly setting up the box from the typical planar folded tube form in which the boxes are shipped.

Abstract: A flat of fiberboard in knocked-down form for setting up into a tray which has strengthened corners. The flat consists of laminated strength-producing connecting corner tabs between hinged side-wall forming flaps. The tabs are formed on the ends of the flaps and some of the flaps are provided with angular fold lines which provide foldable sections in these flaps, the fold lines extending from the flap hinge lines of the respective flaps to a point within the flaps and a slit being provided from that point in each flap to the outer edge of the flap to permit folding of the foldable flap sections.