Simultaneously controlled steam shower and vacuum apparatus and

Details Simultaneously controlled steam shower and vacuum apparatus and Simultaneously controlled steam shower and vacuum apparatus and

1991-10-29

1992-09-22

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

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

34 23, 34 34, 34 54, 162290, 162375, 162252, F26B 1302, F26B 2106, D21F 514

Patent

active

051494019

ABSTRACT:
Method and system for applying steam to a paper forming web for the purpose of heating the web to improve the quality of the paper, and withdrawing steam through the use of a vacuum opposite the steam shower, by the simultaneously controlled removal of steam at equally spaced increments by the use of a computer based control system. The computer based control system includes a selectively actuable stepper motor, to effectuate the simultaneous opening of both the steam valve and opposing withdrawal means valve. The system includes a coanda nozzle to cause steam to travel between the sheet and the adjacent surface of the apparatus in a direction opposite to the direction of travel of the sheet and also includes steam impingement nozzles. The apparatus includes devices for creating, housing and providing a supply of steam and a supply of vacuum.

REFERENCES:
patent: 3945881 (1976-03-01), Speidel
patent: 4331510 (1982-05-01), Wells
patent: 4545857 (1985-10-01), Wells
patent: 4580355 (1986-04-01), Boissevain
patent: 4662398 (1987-05-01), Wywailowski et al.
patent: 4765067 (1988-08-01), Taylor

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