Abstract: A corrugated board tray has stacking lugs extending from double thickness side walls. The stacking lug is formed from an integral upward extension of only the outer one of the side wall panels. The lug is folded inwardly and secured to the inside of the side wall. Corresponding slots are formed at the junction of the side wall and the base to receive the stacking lugs of a lower tray. Half-size trays may include stacking lugs and slots formed in the end walls.

Abstract: A process for the manufacture of a packaging blank of sheet material, such as cardboard, for forming into a box is disclosed. Digitally stored details of a predetermined number of basic box shapes are displayed for selection in accordance with the items to be packaged. The selected basic shape then provides a number of basic designs of box based on the shape, from which a design is selected. A blank in accordance with this design is then displayed, for the user to make further modifications to the design. The details of the final design are stored digitally and used to control a cutting machine to reproduce the blank from sheet material.