Flat-shaped composite material, package sleeve and package with stress-relief panels

A flat-shaped composite material for manufacturing a package, comprising:

• a polymer outer layer,
• a polymer inner layer,
• a fibrous support layer, which is arranged between the polymer outer layer and the polymer inner layer,
• wherein the flat-shaped composite material has a plurality of fold lines, which are arranged and designed such that a closed package an be manufactured by folding the flat-shaped composite material along the fold lines and by connecting seam surfaces of the flat-shaped composite material,
• a sleeve surface, wherein the sleeve surface comprises a front surface, a first side surface, a second side surface, a first rear surface a second rear surface,
• base surfaces, wherein the base surfaces comprise triangular base surfaces and quadrangular base surfaces, and
• gable surfaces, wherein the gable surfaces comprise triangular gable surfaces and quadrangular gable surfaces,
• wherein the base surfaces and the gable surfaces are arranged on opposite sides of the sleeve surface
• wherein the sleeve surface has at least one stress-relief surface, which is arranged between the front surface and one of the two side surfaces,
• wherein a first sleeve fold line is provided between at least on stress-relief surface and the adjoining front surface, and
• wherein a second sleeve fold line is provided between at least one stress-relief surface and the adjoining side surface,
• wherein at least one stress-relief surface adjoins a quadrangular base surface in the region of the base surfaces and adjoins a triangular gable surface in the region of the gable surfaces.