Large cylinder drying roller and method for producing a large cylinder drying roller

A large-cylinder drying roller, comprising:

• a cylindrical cylinder shell having two sides;
• two caps each being attached to a respective one of said sides of said cylinder shell;
• two journals each being provided on a respective one of said caps;
• an inner shaft coaxially disposed within said cylinder shell and connecting said journals to said caps, said inner shaft being a hollow shaft divided into at least two hollow-shaft parts and having an interior;
• a hollow-shaft connection being accessible from said interior of said hollow shaft;
• at least one of:
• (i) said two hollow-shaft parts being interconnected or interconnectable by said hollow-shaft connection or
• (ii) said two hollow-shaft parts each having a cap-connection flange for connecting to one of said caps on an axial side thereof being opposite said hollow-shaft connection;
• and
• at least one of:
• one of said hollow-shaft parts having a part-portion with functional groups all being disposed within said cylinder shell and radially disposed within an axially extending part-cylinder defined by said cap-connection flange or
• said hollow shaft having a portion with functional groups all being disposed within said cylinder shell and radially disposed within an axially extending cylinder defined by said two cap-connection flanges.

In a method for manufacturing a large-cylinder drying roller which includes:

• providing a cylindrical cylinder shell having two sides;
• initially attaching a respective cap to each of the sides of the cylinder shell;
• subsequently inserting an inner shaft coaxially within the cylinder shell and connecting the inner shaft to the caps;
• and
• connecting journals to the inner shaft, the improvement comprising:
• dividing the inner shaft into two inner-shaft parts;
• and
• at least one of:
• inserting each inner-shaft part from a respective side and then connecting each of the inner-shaft parts to the other of the inner-shaft parts and to a respective one of the caps or
• prior to inserting the inner shaft, stress-relieving the cylinder shell and the caps and at least one of checking the connection of the cylinder shell and the caps from the inside or mechanically processing the cylinder shell and the caps together.