Headbox with grooved trailing element

Details Headbox with grooved trailing element Headbox with grooved trailing element

1989-07-26

1990-07-17

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162336, 162344, D21F 102

Patent

active

049419501

ABSTRACT:
In a headbox of a web forming apparatus, a trailing elemnet device is disclosed for dividing a flow of stock flowing through a slice chamber of the headbox towards a slice lip of the headbox. The trailing element device includes a rectangular sheet having an upstream and a downstream end and a first and a second surface. The upstream end of the sheet is pivotally secured within the slice chamber for dividing the flow of stock into a first and a second current. The downstream end of the sheet freely floats adjacent to the slice lip such that the first current of stock flows past the first surface and the second current of stock flows past the second surface so that turbulence within the slice chamber is reduced. At least one of the surfaces defines a plurality of parallel-spaced grooves extending in a direction from the upstream and terminating short of the downstream end of the sheet for inhibiting the formation of machine direction vortices within the flow of stock that would otherwise cause streaking of the resultant web.

REFERENCES:
patent: Re28269 (1974-12-01), Hill et al.
patent: 3843470 (1974-10-01), Betley et al.
patent: 4133715 (1979-01-01), Hergert
patent: 4617091 (1986-10-01), Rodel et al.

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