D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/02 (2006.01)
Patent
CA 2120738
A headbox tube bank apparatus (12) is disclosed for permitting the flow therethrough of stock (S) in a papermaking ma- chine. The apparatus (12) includes a tube bank frame (16) for rigidly supporting the tube bank (12), the frame (16) defining a plu- rality of openings (18, 19, 20, 21). A plurality of tubes (22, 23, 24, 25) cooperate with the frame (16) such that each tube extends through and is supported by an opening. Each tube has an upstream and a downstream portion (26, 28), the upstream portion (26) defining an internal cross-machine direction section of substantially circular configuration for maximizing the velocity of the stock (S) through the tube (22). The downstream portion (28) includes a first and a second end (30, 32) with the first end (30) be- ing connected to the upstream portion (26) and the second end (32) defining a downstream orifice (34) having a flow area in a cross-machine direction which is of rectangular configuration for progressively improving the uniformity, stability, cleanliness, and for lowering turbulence of the stock (S) during flow thereof through the downstream portion (28).
Hergert Richard E.
Hergert Richard R.
Neill Eugene B.
Pantaleo Scott B.
Roerig Arnold J.
Metso Paper Inc.
Ridout & Maybee Llp
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