초록 ▼

In order to control and optimize, without stopping production, bowing in the outer wall of a calender roll in which bowing is produced by the action of pressure on an incompressible liquid enclosed in the roll, the invention proposes that, based on error signals generated from continuous thickness m

In order to control and optimize, without stopping production, bowing in the outer wall of a calender roll in which bowing is produced by the action of pressure on an incompressible liquid enclosed in the roll, the invention proposes that, based on error signals generated from continuous thickness measurements and from at least one other quality characteristic, the temperature of the liquid is controlled and the nip modified to correct for deviations from the correct thickness.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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

[ What is claimed is:] [1.]1. 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.