Water control system including a pressure roll for suction rolls

Details Water control system including a pressure roll for suction rolls Water control system including a pressure roll for suction rolls

1975-01-06

1978-10-31

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

162217, 162274, 162306, D21F 310

Patent

active

041233204

ABSTRACT:
The use of a pressure roll in a water control system for suction rolls generally and couch rolls particularly for a papermaking process of the type wherein water is removed from the wet paper web that has been run around the roll and wherein a surface tension covering is provided around the periphery of the couch roll on at least a portion of the couch roll and a water control zone is provided within the couch roll to control the water removed from the paper to the surface tension member with variations of the pressure within the water control zone to directionally control the discharge of water off the couch roll in a predetermined pattern for deposit in the water collecting pan provided in proximity to the couch roll.
The pressure roll, having a new soft rubber covering, is mounted in face-to-face pressure engagement against the couch roll, with the pressure nip therebetween located in the water collecting zone preferably within one to one-and-a-half inches of the beginning of the water collecting zone. The pressure roll serves to counteract the natural tendency of the pulp fines to plug up the interstices of the wire mesh screen covering on the couch roll which would cause the water removal and water control action of the couch roll to be hampered.

REFERENCES:
patent: 1590875 (1926-06-01), Barlow et al.
patent: 2429689 (1947-10-01), Hornbostel
patent: 3111454 (1963-11-01), Tucker et al.
patent: 3902960 (1975-09-01), Zentner et al.

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