초록 ▼

A multi-ply paperboard container for use as a bulk material bin has elongate rectangular cross-sectioned tubular inner and outer shells having walls that are spaced apart from one another. Rectangular panels, having a width less than the width of the walls of the shells, are located between and adhe

A multi-ply paperboard container for use as a bulk material bin has elongate rectangular cross-sectioned tubular inner and outer shells having walls that are spaced apart from one another. Rectangular panels, having a width less than the width of the walls of the shells, are located between and adhesively bonded to each overlying pair of walls. Thus, gaps are formed between the inner and outer shell at each corner of the container. The corners of the inner and outer shells are crushed to provide wide soft corners. These gaps and crushed corners permit the container to be easily knocked down to a flat configuration without a substantial amount of spring-back. The container includes a bottom cap having end flaps inserted between the inner and outer shells or between adjacent plies in the inner or outer shells, and the outer shell has closure flaps which fold over the bottom cap to keep the end flaps in place. When loaded, the bottom cap and closure flaps prevent the container walls from bending outwardly. The inner and outer shells are constructed from two-ply double wall corrugated material and the panels are constructed from one-ply double wall corrugated material. The inner liner on the inner ply of the inner shell is thicker than the liners of the other plies, and the inner ply of the inner shell has smaller flutes than the remaining plies preventing the inner ply from buckling when the walls are bent outwardly.

대표청구항 ▼

[ What is claimed is:] [1.] A method for making a corrugated paperboard container comprising:(a) Providing an elongate, rectangular cross-sectioned, corrugated paperboard tubular inner shell having two pair of planar opposed inner walls with first dimensions between outer surfaces of said opposed in

[ What is claimed is:] [1.] A method for making a corrugated paperboard container comprising:(a) Providing an elongate, rectangular cross-sectioned, corrugated paperboard tubular inner shell having two pair of planar opposed inner walls with first dimensions between outer surfaces of said opposed inner walls;(b) providing an elongate, rectangular cross-sectioned, corrugated paperboard tubular outer shell having two pair of planer opposed outer walls with second dimensions between inner surfaces of said opposed outer walls, said second dimensions being greater than said first dimensions by a predetermined amount;(c) placing said inner shell inside of said outer shell; and(d) inserting rectangular corrugated paperboard panels having glue applied to both sides thereof between each overlying wall of said inner and outer shell, said panels having a thickness which is approximately equal to one-half of said predetermined amount.