Patent ID: 6261487
Filing Date: 2001-07-17
Classification: B29C,D21G,F16C

Abstract:
A method of changing a camber of one roll of two rolls forming a nip therebetween in a plant for producing and/or processing an endless planar web continuously passed through the nip and wherein the nip changes under load, comprising the steps of:applying pressure to an interior of the one roll using a pressurized incompressible fluid contained in and completely filling an annular chamber in and about the one roll;controlling the nip between the two rolls by controlling a pressure of the pressurized incompressible fluid in the annular chamber to change the camber of the one roll by indirectly adjusting a temperature of the pressurized incompressible fluid as the endless planar web continuously passes through the nip; andcontrolling the pressure of the pressurized incompressible fluid in the annular chamber by flowing a control fluid in a heating/cooling control fluid circuit through the one roll in heat exchange relation with the pressurized incompressible fluid and by adjusting a temperature of the control fluid flowing through the one roll in response to a deviation of a measured thickness of the endless planar web over its width from a predetermined thickness to thereby indirectly adjust the temperature of the pressurized incompressible fluid.