Headbox with grooved trailing element

Details Headbox with grooved trailing element Headbox with grooved trailing element

D - Textiles, Paper

21

F

D21F 1/02 (2006.01)

Patent

CA 2057056

In a headbox (10) of a web forming apparatus (12), a trailing element device (14) is disclosed for dividing a flow of stock (16) flowing through a slice chamber (18) of the headbox (10) towards a slice lip (20) of the headbox (10). The trailing element device (14) includes a rectangular sheet (22) having an upstream and a downstream end (24, 26) and a first and a second surface (28, 30). The upstream end (24) of the sheet (22) is pivotally secured within the slice chamber (18) for dividing the flow of stock into a first and a second current (34, 36). The downstream end (26) of the sheet (22) freely floats adjacent to the slice lip (20) such that the first current of stock (34) flows past the first surface (28) and the second current of stock (36) flows past the second sur- face (30) so that turbulence within the slice chamber (18) is reduced. At least one of the surfaces defines a plurality of parallel- spaced grooves (42-45 and 46-49) extending in a direction from the upstream to the downstream end (24, 26) of the sheet (22) for inhibiting the formation of machine direction vortices within the flow of stock that would otherwise cause streaking of the result- ant web (W).

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