Ventilation board of multi-layer material with ventilation passageways between non-aligned and non-overlapping apertures in adjacent layers

摘要

The present disclosure relates to a ventilation board, an insulating board, a ventilation system, and articles and architectural applications comprising said ventilation board and a method of manufacturing the ventilation board. The said ventilation board comprises a layer (11) provided with a first aperture (5); an adjacent layer provided (13) with a second aperture (7), the first and second apertures being located relative to each other such that they are non-aligned and are substantially without overlap; and a passageway (9) interconnecting the first and second apertures thereby permitting the passage of fluid therebetween. Therefore, the carton comprising said ventilation board when used for fast food packaging provides sufficient ventilation of the carton so that water condensed from food vapours does not run on to the food in the carton, and sufficient insulation so that the food in the carton is kept warm.