a yankee drying cylinder for drying a fibrous web and a method of manufacturing a yankee drying cylinder

摘要

The present invention relates to a yankee drying cylinder (1) for drying a fibrous web (w) such as a tissue paper web. the yankee drying cylinder (1) comprises a circular cylindrical shell (2) having an axial extension and a first axial end (4) and a second axial end (5). The shell also has an inner surface (6) and an outer surface (7). For each axial end (4, 5) of the circular cylindrical shell (2), there is an end wall (8, 9) joined to the circular cylindrical shell (2) such that the circular cylindrical shell (2) and the walls (8,9) define an enclosed space (13). a central lashing member (14) extends between the end walls (8, 9) and is joined to the end walls (8, 9) by welded joints (19, 24, 25, 26). In accordance with the present invention, each end wall (8, 9) has a central opening (11, 12) to which the longitudinal ends (15a, 15b) of the lashing member (14) are fitted and welded to the walls. ends (8, 9) by welding joints located within the enclosed space (13) and by welding joints located outside the enclosed space (13). The present invention also relates to a method of manufacturing the yankee drying cylinder (1).