Metallic, multi-layer material, for insulation, produced by sandwiching inner metal plate between outer metal facings; inner plate has piercings, which are formed to produce projecting tongues to support outer facings

摘要

The metallic multi-layer material consists of two external metallic facings (2, 3), with an internal plate (10), which is pierced with a series of orifices (11). The edge of each orifice is formed into a tongue (12), which projects towards one of the outer facings, which are in contact with the edges of the tongues, to form a series of free spaces between the facings and the internal sheet.