Device for impulse-pressing a web

A pressing device for treating a continuous web of fibrous material, comprising:

• a first press member having a rotating component defining a rotating surface for exerting pressure on the web;
• a second press member comprising a generally cylindrical press body that rotates about a central longitudinal axis thereof, and a generally tubular sleeve that surrounds the press body and is rotatably driven to rotate therewith, the press body urging the sleeve against the first press member so as to form a nip between the rotating component of the first press member and the sleeve, the web being passed through the nip, the sleeve being movably connected to the press body such that the sleeve is free to expand in all directions relative to the press body;
• and
• a heat source arranged to continuously heat the sleeve such that heat is transferred from the sleeve to the web;
• wherein the press body includes tooth elements about a circumference of the press body and projecting outwardly therefrom, and the sleeve defines slots distributed about a circumference of the sleeve, the tooth elements engaging the slots for rotatably driving the sleeve.

A pressing device for treating a continuous web of fibrous material, comprising:

• a first press member having a rotating component defining a rotating surface for exerting pressure on the web;
• a second press member comprising a generally cylindrical press body that rotates about a central longitudinal axis thereof, and a generally tubular sleeve that surrounds the press body and is rotatably driven to rotate therewith, the press body urging the sleeve against the first press member so as to form a nip between the rotating component of the first press member and the sleeve, the web being passed through the nip, the sleeve being movably connected to the press body such that the sleeve is free to expand in all directions relative to the press body;
• and
• a heat source arranged to continuously heat the sleeve such that heat is transferred from the sleeve to the web;
• wherein the second press member includes at least one stop element arranged on at least one end of the second press member for restraining movement of one end of the sleeve in an axial direction while allowing free axial expansion of the sleeve upon heating of the sleeve.