Patent ID: 6675551
Filing Date: 2004-01-13
Classification: E04B,G10K

Abstract:
Plate-shaped constructional element defining at least part of any of wall wainscoting, a ceiling, a jointless facing shell, and a wall having a dual-shell structure, comprising:a sound-absorbing perforated plate approximately 6 to 30 mm thick made of a solid material such as metal, wood, wood chip board, pressboard, synthetic material or gypsum, and a micro-perforated sheet or thin plate disposed on one of the plate surfaces of said perforated plate, wherein said perforated plate consists of a supporting structure or grating having a hole area fraction of 10-90%, and wherein said micro-perforated sheet or thin plate includes holes having diameters smaller than 2 mm and a hole area fraction smaller than 4% of the total area.