Importance

Loading Importance Indicators...

Abstract

The operation of a calender or a like machine with at least one pair of rolls which define an elongated nip and wherein at least one of the rolls is a so-called bending compensation roll is regulated by a computer which transmits signals to adjustable pressure regulating valves in conduits serving to admit pressurized fluid to a plurality of actuators (such as hydrostatic bearing elements and hydraulic cylinder and piston units for the bending compensation roll) which can alter the load parameter (such as the line load or the compressive strain) in discrete zones of the nip. The computer has inputs for signals which indicate the temperature in the nip, for signals which indicate the characteristics of the web that is advanced through the nip, and for signals from a memory for a pressure reaction matrix. The pressure of fluid is regulated in such a way that changes of the actual value of load parameter in a selected zone of the nip do not entail any changes, or do not entail any appreciable changes, in other zones of the nip.

Loading the Abstract Image...

First Claim