Device for manufacturing a material web

A device for manufacturing, processing or finishing a web-shaped material web including a fiber-material, paper, tissue or cardboard web, the device comprising:

• a housing being a drying cylinder having an inner face and an outer face and defining surroundings of said housing, and said housing including a sleeve having sides and end covers each attached to a respective one of said sides;
• said end covers each having a respective bearing journal, at least one of said end covers including an inner cover and an outer cover, said inner cover having an opening formed therein, said outer cover including a multiplicity of segments, one of said segments of said outer cover having a marking for identification of a position of said opening, and said outer cover having an inner side and an outer side;
• an interior space at least partly surrounded by said housing, said interior space having a temperature different than a temperature of said surroundings of said housing;
• and
• a thermal-insulation layer disposed at least in partial regions of at least one of said inner face or said outer face, said thermal-insulation layer being disposed on at least one of said inner side or said outer side of said outer cover, and said thermal-insulation layer including at least one coating;
• said at least one coating including cavities and having a volume, and said cavities having a volume being 15% to 30% of said volume of said coating and a layer thickness range selected from the group consisting of 2 mm to 10 mm, 3.5 mm to 6 mm, and 3.5 mm to 4.5 mm.