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The invention comprises a corrugated container for high density bulk materials. The side walls of a box or inner tube for a box are formed from two separate corrugated pieces, connected by overlapping seams. Each overlapping piece has a free end which is scored and folded to form an integral vertica

The invention comprises a corrugated container for high density bulk materials. The side walls of a box or inner tube for a box are formed from two separate corrugated pieces, connected by overlapping seams. Each overlapping piece has a free end which is scored and folded to form an integral vertical support post, in the form of a vertically disposed triangular prism, the apex of which extends towards the interior of the box. The free end of each overlapping piece is tucked within the seam overlap, to secure the triangular post. The triangular vertical support posts in the side walls of the tube increase the stiffness of the side walls to prevent them from bulging under the pressure of the bulk material contained within the box. To increase the strength of the box against stacking forces and internal pressures, the inner box or tube may be placed snugly within an outer corrugated box.

대표청구항 ▼

A reinforced corrugated shipping box for bulk materials comprising a pair of identical corrugated blanks each scored and folded on two vertical corners to form a vertical end wall and two vertical partial side walls terminating in vertical edges, the partial side walls of each blank being disposed i

A reinforced corrugated shipping box for bulk materials comprising a pair of identical corrugated blanks each scored and folded on two vertical corners to form a vertical end wall and two vertical partial side walls terminating in vertical edges, the partial side walls of each blank being disposed in overlapping relationship with the partial side walls of the other said blank, a pair of vertical seams joining said overlapped partial side walls to form a tube, each said vertical seam being respectively disposed in spaced relationship from said vertical edge of the inside one of said overlapped partial side walls, thereby defining an integral free end portion on the inside of each side wall of the assembled tube between said vertical edge and said seam, each free end portion being folded inwardly on vertical fold lines to form a reinforcing post of triangular configuration, spaced from said end walls and said corners, that portion of said reinforcing post incorporating said vertical edge lying adjacent the respective side wall and spaced from said end walls, and means defining a bottom wall for cooperating with said tube.