Patent ID: 6045492
Filing Date: 2000-04-04
Classification: F16C

Abstract:
A roller for pressure treating a web composed of one of a paper material, a textile material, a plastic film and a similarly composed material, comprising:a rotary hollow cylinder forming a working roller circumference, the working roller circumference being deformable under an effect of line forces in a roll nip;a non-rotary cross-head penetrating the rotary hollow cylinder over a length of the rotary hollow cylinder, the non-rotary cross-head having a predetermined radial distance from an inside circumference of the rotary hollow cylinder, the non-rotary cross-head being supported by external supports on end portions of the non-rotary cross-head;hydraulic supporting elements arranged on the non-rotary cross-head and on a side of the roll nip in at least one longitudinal row, the hydraulic supporting elements having a form of piston/cylinder units and being pressable against the inside circumference of the rotary hollow cylinder with a pressure fluid, the hydraulic supporting elements having a length of at most 20 cm in a longitudinal direction of the non-rotary cross-head, one of the hydraulic supporting elements being closely arranged to another one of the hydraulic supporting elements in the longitudinal direction of the non-rotary cross-head, the hydraulic supporting elements being drivable independently from one another in at least a predetermined number of groups of the hydraulic supporting elements; andat least one flexible sealing strip extending over at least two elements of the hydraulic supporting elements which follow one another in the longitudinal direction of the non-rotary cross-head, the at least one flexible sealing strip being disposed on the at least one longitudinal row of the hydraulic supporting elements,wherein the hydraulic supporting elements contact a bottom portion of the at least one flexible sealing strip so that the at least one flexible sealing strip acts against the inside circumference of the rotary hollow cylinder via a top portion of the at least one flexible sealing strip,wherein each of the at least one flexible sealing strip has, at the top portion, a respective bearing pocket which includes at least one edge fully extending around the respective bearing pocket, the respective bearing pocket being open toward the inside circumference of the rotary hollow cylinder and being disposed above a top side of a respective element of the hydraulic supporting elements, the respective bearing pocket being fillable with the pressure fluid to support the rotary hollow cylinder, the at least one edge being disposed against the inside circumference of the rotary hollow cylinder,wherein the pressure fluid constantly flowing over the at least one edge to at least one particular location and forming a liquid film at the at least one particular location to support the rotary hollow cylinder,wherein the at least one flexible sealing strip has perforations which extend from the bottom portion to the top portion of the at least one flexible sealing strip and open into the bearing pockets, the perforations being connected to feed channels of the hydraulic supporting elements for receiving the pressure fluid from the hydraulic supporting elements, at least one of the feed channels being connected to a respective feed line provided in each of the hydraulic supporting elements,wherein a first strip of the at least one flexible sealing strip follows a second strip of the at least one flexible sealing strip in a longitudinal direction of the roller, the at least one edge of the respective bearing pocket of the first strip has a first side which is adjacent to a second side of the at least one edge of the respective bearing pocket of the second strip, the first and second sides being formed by a transverse edge of the respective bearing pockets of the first and second strips,wherein the hydraulic supporting elements have a length of at most 20 cm in the longitudinal direction of the rotary cross-head, andwherein the feed channels and the perforations are throttle-free.