Stationary ceramic couch device with water spray cleaning nozzle

Details Stationary ceramic couch device with water spray cleaning nozzle Stationary ceramic couch device with water spray cleaning nozzle

1988-08-24

1989-11-14

Hastings, Karen

Paper making and fiber liberation

Apparatus

Apparatus repair, cleaning or conditioning

162275, 162306, 162352, 162374, D21F 152, D21F 134

Patent

active

048805009

ABSTRACT:
A papermaking machine is modified by replacing a conventional rotatable couch roll by a stationary couch device that still serves the essential functions of the roll, namely dewatering of the furnish carried by the web and modification of the direction of travel of the web to turn it down towards the main drive roll. This stationary device is made of an abrasion resistant ceramic material and has a member with a convexly curved upper surface on which the web slides. Water is sucked from the furnish by a vacuum applied through perforations in the member. The majority of these perforations preferably take the form of slots that extend obliquely to both the transverse extent of the machine and the direction of web travel. The arrangement permits easier and more effective maintenance of the vacuum than with a couch roll and more efficient dewatering, with no rewetting of the web or furnish when leaving the couch device.

REFERENCES:
patent: 2408176 (1946-09-01), Proulx
patent: 2712776 (1955-07-01), Wagenknecht
patent: 2728273 (1955-12-01), Javid
patent: 2976925 (1961-03-01), Youngchild
patent: 3022821 (1962-02-01), McArdle
patent: 3441476 (1969-04-01), Schiel
patent: 3758380 (1973-09-01), Hawkings
patent: 3836428 (1974-09-01), McConaughy
patent: 3846233 (1974-11-01), Kankaanpaa
patent: 4113557 (1978-09-01), Kankaanpaa
patent: 4285768 (1981-08-01), Schiel
patent: 4484981 (1984-11-01), Fuchs et al.

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