Patent ID: 7128257
Filing Date: 2006-10-31
Classification: B65D,Y10S

Abstract:
1. In a bulk container made of corrugated paperboard folded to define side walls joined at adjacent edges along vertical scores, and bottom-forming flaps joined to a bottom edge of the side walls along flap scores perpendicular to the vertical scores, wherein adjacent flaps are separated from one another by flap slots that have a terminal end near but spaced from associated vertical scores, the improvement comprising: an arcuate stress-relieving cut line made through the material of the flaps between the terminal end of the respective flap slots and the associated vertical scores, each said arcuate cut line having a portion connected with the terminal end of a said flap slot and a portion substantially contiguous with a said flap score, and terminating in an end spaced from and pointed laterally away from a said vertical score, out of alignment with the vertical score, and into the flap material to redirect stresses away from the vertical score and resist initiation of tearing of the vertical score adjacent the terminal end of the flap score, wherein the shaped cut line has a shape substantially like an upside down Greek letter psi, with a central curved portion curved away from the vertical score, and opposite ends pointing laterally outwardly away from the central curved portion.