Wet press with vibration control

Details Wet press with vibration control Wet press with vibration control

1988-06-03

1990-02-20

Fisher, Richard V.

Paper making and fiber liberation

Apparatus

Automatic control

162262, 162274, 162358, 100118, 100153, D21F 302, D21F 124

Patent

active

049023845

ABSTRACT:
A wet press of a paper-making machine includes a pair of rolls defining a roll gap through which the paper to be treated and belt-shaped felt are simultaneously conducted. The felt is guided in a closed loop path by additional rolls which include a tightening roll. The tightening roll can be tilted to reduce roll vibrations by tightening the felt to set vibratory marks formed in the felt at an angle relative to the transverse width of the felt and the roll gap. A controllable positioning device is provided which includes a motor operated by a controller during predetermined time intervals or as a function of actual vibrations sensed at the pair of rolls forming the roll gap to automatically vary the tilt angle.

REFERENCES:
patent: 2484473 (1949-10-01), Staege
patent: 3517819 (1970-06-01), Helland
patent: 4077834 (1978-03-01), Stark
patent: 4140574 (1979-02-01), Justus
Stark, Th., "Elektronischer Regler zur gleichzeitigen Regelung von Lauf and Spannung bei Filzen und Sieben, mit nur einer walze", Wochenblatt f. Papierfabrikation, Jul. 1976, pp. 235-242.

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