CARDBOARD BOX Russian patent published in 2009 - IPC B65D5/00 

FIELD: textile fabrics; paper; package.

SUBSTANCE: cardboard box comprises upper cover, bottom, two side walls, two end walls with side folds and snap valve in one of end walls. Besides side walls have three-layer structure consisting of medium layer - formed by folds of end walls, external layer - connected to bottom side edge via bending line, and internal layer - connected via bending line with side edge of external sheet. At that sheets embrace the medium layer with provision of through gap between external layer and medium layer. Besides valve is arranged in the edge of internal sheet of every side wall, and this valve is placed and fixed on the bottom with the help of latch locks withdrawn through bottom on the line of its bending with external sheet of side wall with provision of support legs. Ventilation openings are provided in folds of end walls and internal sheet of every side wall, and these openings exit to gap between external sheet and medium layer of side wall. Besides in external sheets of side walls sickle-shaped slits are provided, in which valves formed by bending line on cover side edges are inserted. On external side end wall is embraced by cover fold, and its free edge is inserted in slit arranged in this end wall. Every side valve of cover fold is inserted from the side of end wall in gap between external sheet of side wall and its medium layer.

EFFECT: increased rigidity of box walls and bottom, with possibility of convenient withdrawal of items, and creation of ventilated air space inside.

2 cl, 3 dwg