Formation in a two fabric paper machine

Details Formation in a two fabric paper machine Formation in a two fabric paper machine

1996-06-11

1998-04-07

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162300, 162352, D21F 100

Patent

active

057353301

ABSTRACT:
A forming section for a two-fabric paper machine using at least one formation blade having a shallow cavity in its top surface. The cavity is placed and dimensioned to withdraw fluid continuously from the stock, and to propel it back through the fabric and the incipient paper web into the stock so as to cause a controlled level of localized turbulence which serves to improve formation without causing excessive drainage or fines loss. The formation blade shape, in conjunction with the forming fabric tension, is configured to provide a hydraulic seal between the fabric and the stock, so that all of the withdrawn fluid is returned to the stock.

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Hettle et al; "Twin Wire Forming at Powell River - A Preliminary Review" Technical Paper 23, 2nd Newsprint Conference, 1971.

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