TUBE CASE MADE OF FLAT SHEET BLANK Russian patent published in 2015 - IPC B42F7/00 B65D3/00 

FIELD: personal use articles.

SUBSTANCE: tube case of a flat sheet blank made of resilient dense material such as plastic sheet contains slots with figured locks positioned opposite the slots and designed so that to enable fixation in the slots. The tube case is equipped with butt-end closing means. The sheet blank is rectangular shaped; the tube case has a drop-shaped cross section including a chute-shaped area with the walls conjugated with the rectangular flat areas. On one side of the blank there is a bending flap separated from the other surface of the sheet blank with at least one line off the blank material attenuation parallel to the shorter sides. There are at least two lines of the blank material attenuation (parallel to the shorter sides) positioned at equal distance from the crosswise symmetry axis of the remaining blank surface. The tube case is equipped with at least one butt-end closing means formed by a longitudinal slot oriented along the longer side of the blank connecting the centrally positioned blank material attenuation lines turned towards the shorter sides.

EFFECT: minimisation of document sheet deformation during storage.

4 cl, 3 dwg