Tissue paper making machine and a method of operating a tissue paper making machine

A tissue paper making machine (1) comprising:

• a forming section (2);
• a Yankee drying cylinder (3);
• a shoe roll (4) arranged to form a nip with the Yankee drying cylinder (3), the shoe roll (4) comprising:
• a shoe (6) arranged to act against the Yankee drying cylinder (3) in the nip formed between the shoe roll (4) and the Yankee drying cylinder (3), the nip having a maximum extension from an entry point (7) of the nip to an exit point (8) of the nip;
• and
• a flexible tubular belt (9) that forms a loop around the shoe (6) and forms an outer circumference of the shoe roll (4);
• a carrier fabric (10) arranged to be capable of carrying a fibrous web (W) from the forming section (2) to the nip formed between the Yankee drying cylinder (3) and the shoe roll (4) and pass through the nip between the Yankee drying cylinder (3) and the shoe roll (4) together with the fibrous web (W), the carrier fabric (10) being arranged to reach the outer circumference of the shoe roll (4) at a first contact point (11) such that the carrier fabric (10) will wrap a part of the outer circumference of the shoe roll (4) over an area stretching from the first contact point (11) to the nip,
• wherein:
• the shoe roll (4) further comprises a mechanical support (12) located inside the loop of the flexible tubular belt (9), the mechanical support (12) being placed to support the flexible tubular belt (9) in at least a part of the area between the first contact point (11) and the nip between the Yankee drying cylinder (3) and the shoe roll,
• the flexible tubular belt (9) has axial ends (15, 16) connected to end walls (17, 18) such that the end walls (17, 18) and the flexible tubular belt (9) define an enclosed space (19), and
• the paper making machine (1) further comprises a source (20) of pressurized air that can communicate with the enclosed space such that the enclosed space (19) can be filled with pressurized air,
• the carrier fabric (10) is under a tension which is in the range of 3.0 kN/m-5.0 kN/m,
• the carrier fabric (10) wraps the outer circumference of the shoe roll (4) in the area stretching from the first contact point (11) by an angle which is greater than 80°,
• the mechanical support (12) is arranged to support the flexible tubular belt (9) in the area from the first contact point to the nip over an angle that is more than 90° and
• the mechanical support (12) has an end positioned at a point (13) which, in a circumferential direction of the shoe roll (4) in a rotation direction of the carrier fabric (10), is closer to the entry point (7) of the nip than to the exit point (8) of the nip and which, for the maximum extension of the nip, is at an angular distance from the entry point (7) of the nip which is at least 8°.