Flat packaging material

摘要

Flat packaging material having a substantially flat base plate (1) made of substantially flexible material, such as paper or the like, having a substantially flat covering plate (2) made of substantially flexible material, such as paper or the like, and having an intermediate layer (3) which holds the base plate (1) and the covering plate (2) apart, is made of corrugated inherently flexible material, such as paper, cardboard and the like, and is bonded or glued to the base plate (1) and the covering plate (2), characterised in that the radii of curvature of the intermediate layer (3) run substantially parallel to the plane of the base plate (1) and the covering plate (2). <IMAGE>