Pressure control forming section

Details Pressure control forming section Pressure control forming section

1989-06-08

1991-04-30

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162209, 162211, 162364, D21F 148, D21F 902

Patent

active

050115774

ABSTRACT:
A method and apparatus are disclosed whereby the rate of drainage of the stock on a Fourdrinier paper making machine can be controlled for the full length of an open surface forming section. A continuous sealed drainage box is used from adjacent the head box slice to the end of the forming section, within which the air pressure can be controlled. In the area adjacent the head box slice drainage is hindered by the use of a positive (above ambient atmospheric) pressure, while further along the forming section the pressure is decreased to a negative value (below ambient atmospheric). Improved paper formation and first pass retention are obtained.

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The Formation and Structure of Paper; Technical Section of the British Paper and Board Makers' Association (Inc.), Plough Place, Fetter Lane, London, E.C.4, 1962, vol. 2, P. E. Wrist.

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