System in a press section of a paper machine for monitoring and

Details System in a press section of a paper machine for monitoring and System in a press section of a paper machine for monitoring and

1992-05-21

1995-04-04

Jones, W. Gary

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162DIG10, 162252, 162262, 364471, 395904, D21F 300

Patent

active

054034477

ABSTRACT:
System in a press section of a paper machine for monitoring and control of the running of the press felts (10,20,30). The press felts (10,20,30) are guided by means of rolls (13,14,15; 23,24,25; 33,34, 35), whose axial directions are altered by means of an actuator (18a, 18b) so as to control the running of the press felts (10,20,30). The system includes detector devices (16,26,36), by whose means the alignment stripe (K) on the felt or felts (10,20,30) is detected, as well as oscillation detectors (17,27,37), by whose means oscillations of the press rolls (10, 20,30) are detected. Into the computer part (50) included in the system, the monitoring signals (a,b) are fed from said detectors (16,26,36, 17,27,37). The computer (50) analyzes the detector data in order to detect any felt-induced oscillations. By the intermediate of a control system (40), the computer (50) regulates the actuators (18a, 18b) of the guide rolls that guide the running of the felts (10,20,30) so that, when the oscillation levels of the press rolls rise beyond certain limits, the direction of the guide roll of the felt (10;20;30) that causes the oscillation is turned until an acceptable level of oscillation and/or a level of oscillation as low as possible is found.

REFERENCES:
patent: 4902384 (1990-02-01), Anstotz et al.
patent: 4949278 (1990-08-01), Davies et al.
patent: 5167010 (1992-11-01), Elm et al.
Fadun Ole, "An Introduction to Articial Intelligence", Mar. 1993, pp. 85-92, Pulp & Paper Magazine.
Gagnon Yvon, "Low Freq. Vibration Analysis of PM Presses Using Displ. Transducers and the Synchronous Time-av Method", Jul. 87, TAPPI Journal, pp. 49-54.

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