Preform of a protective element, method of producing a preform of a protective element and method of producing a protective element

Abstract

The subject of the application is a casing element preform comprising at least two chamber element preforms, wherein each chamber element preform comprises a first wall and a second wall (4) made of a metal sheet, arranged relative to each other while maintaining a gap, wherein the edges of the individual walls are sealed by means of an edge seal (6a), wherein a valve (5) is arranged on at least one wall of the first chamber element preform or the second chamber element preform, wherein at least one wall of each chamber element preform is provided with at least one communication opening, wherein the chamber element preforms are facing each other with their respective walls so that the chamber element preforms are connected to each other by the circumferential edges of the respective communication openings via the circumferential seal,for defining a tight, airtight inner space of a preform of a casing element comprising the inner space of at least the first preform of the chamber element and the second preform of the chamber element. The subject of the application is also a method of producing a preform of a casing element, as well as a method of producing a casing element.