Patent ID: 8741418

Claim:
Cellular board comprising: first and second substantially parallel surface plates and a core structure between the plates, wherein the cellular board comprises a number of profiles of plate-like material fastened to each other, the plate-like material of the profiles having first and second profile folds to thereby establish (i) a substantially planar first surface projection, (ii) a substantially planar second surface projection, and (iii) a core part which separates the first and second surface projections and is connected to the first and second surface projections by the first and second profile folds, respectively, wherein the profiles are fastened to each other so that in adjacent profiles the first surface projections thereof are placed side by side and form the first surface plate of the cellular board, the second surface projections thereof are placed side by side and form the second surface plate of the cellular board, and the profile core parts thereof are fastened to the first and second surface plates and form the core structure of the cellular board, and wherein the cellular board further comprises mutually fitting fixing folds formed at ends of the first and second surface projections and at the first and second profile folds at a junction between the first and second surface projections and the core part, respectively, such that the profiles to be located side by side are fixed by placing the fixing folds at an end of the first and second projections against a respective fixing fold at the junction between a respective one of the first and second surface projections and the core part, and wherein the fixing folds of the profiles forming two adjacent surface projections and one core part of the cellular board are attached and fastened to each other with a machine seam.