Reinforced single-face corrugated containers

Abstract

Reinforced single-face corrugated fiberboard containers of remarkable strength are disclosed which can be mass produced at minimum cost in a high-speed continuous process from a continuous sheet of single-face corrugated material comprising a corrugated web adhesively secured to a single facing sheet having a width much greater than that of the web to provide outwardly extending fly portions of substantial width. The web forms the corrugated core of a single-wall laminated board formed by turning over the fly portions to reinforce the side edges and adhesively securing the fly portions to the corrugations to partially cover the core and to provide the board with double-faced side portions and an unreinforced single-faced middle portion. The laminated board can be passed through rotary cutting dies or the like in a high-speed continuous process to cut and form slotted box blanks having a first set of transverse fold lines dividing the blank into a series of rectangular wall panels, a second set of longitudinal fold lines extending the length of the fly portions, and a series of transverse slots extending from the latter fold lines to the outer side edges of the laminated board to define a series of pairs of double-faced end flaps for closing and reinforcing the opposite ends of the assembled box or carton. The invention also provides strong open-ended containers such as lids, trays and the like which can be produced much more economically than the standard double-faced corrugated products.