Packaging material web for a self-supporting packaging container wall,

Abstract

A packaging material web for a self-supporting packaging container wall which includes a number of continuous wall panels manufactured from flexible material layers which are interconnected with one another by means of a pattern of seals. Between the seals, there are formed cells which are inflatable with a view to imparting to the material the requisite rigidity. A packaging container manufactured from the packaging material comprises a number of wall panels provided with inflatable cells, the length of the wall panels on inflation of the cells being reduced so that the height of the packaging container shrinks. Along one of the vertical side edges of the packaging container, there is a sealing joint (10) which is less flexible and counteracts such shrinkage so that the packaging container tends to be warped. In order to counteract this, the seals defining the cells are given asymmetric form, with one narrow and one broad end. The narrow end of the seals is turned to face towards the sealing joint (10) and the interjacent cells will hereby have ends of varying size, which corrects the shrinkage of the material such that the effect of the sealing joint (10) is reduced and the packaging container obtains the desired, symmetric form.