Matrix und Verfahren zu ihrer Herstellung

Matrix (1) mit einer Vielzahl von frei durchströmbaren Kanälen (2) für das Abgas von Brennkraftmaschinen aus mehreren Lagen von Metallfolie, wovon - wenigstens eine Metallfolie eine glatte Metallfolie (3) ist, - wenigstens eine strukturierte Metallfolie (4) eine Primärstruktur aufweist, - die glatte (3) oder die strukturierte (4) Metallfolie in axialer Richtung (10) nur abschnittsweise vorhanden ist und - die andere Folie Durchschneidungen (5) aufweist, deren gegeneinander gerichtete Schnittflächen (6a, b) quer zur Hauptebene der Folie zueinander versetzt sind, - die Durchschneidungen (5) in den Abschnitten (7) liegen, in denen keine abschnittweise Metallfolie vorhanden ist, dadurch gekennzeichnet, dass - die Durchschneidungen (5) Bestandteil von Umstülpungen (9) als Sekundärstruktur (8) sind, die an der durchgehenden Folie, egal ob es die ansonsten glatte (3) oder die strukturierte (4) Folie ist, vorhanden sind. The matrix comprises freely flow-throughable channels for an exhaust gas of internal-combustion engines from layers of metal foil, where the metal foil is a smooth metal foil (3) and a continuously-structured metal foil (4). The continuously-structured metal foil has a primary structure in the form of shafts. The smooth metal foil or the continuously-structured metal foil is partially present in an axial direction (10). Other continuous foil comprises intersections whose mutually opposed cutting faces (6a, b) are offset from one another transverse to a main plane of the foil. The matrix comprises freely flow-throughable channels for an exhaust gas of internal-combustion engines from layers of metal foil, where the metal foil is a smooth metal foil (3) and a continuously-structured metal foil (4). The continuously-structured metal foil has a primary structure in the form of shafts. The smooth metal foil or the continuously-structured metal foil is partially present in an axial direction (10). Other continuous foil comprises intersections whose mutually opposed cutting faces (6a, b) are offset from one another transverse to a main plane of the foil. The intersections: lie in sections (7) in which no metal foil is present; and are part of a secondary structure (8), which is present in the continuous foil. The secondary structure comprises inverted sections (9) of shaft-mountains (12) with the intersections of the curved metal foil placed at one end of the inverted sections. The total inverted sections in sections are arranged away from the metal foil