D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/06 (2006.01) D21F 1/02 (2006.01)
Patent
CA 2120934
A headbox apparatus (10) is dis- closed for ejecting stock (S) onto a forming wire (12) for forming a web (W). The appar- atus (10) includes a housing (14) which is connected to a pressurized source (P) of the stock (S). The housing (14) defines a tapered inlet (16) for the flow therethrough of the stock (S). The tube bank (18) has an up- stream and a downstream end (20, 22) with the upstream end (20) being connected to the tapered inlet (16) such that the stock (S) flows at a substantially constant flow rate through the inlet (16) and through the up- stream end (20) of the tube bank (18) to the downstream end (22) of the tube bank (18). The tube bank (18) includes a plurality of tubes (24, 25, 26, 27) for the flow there- through of the stock (S). A member (28) de- fines a slice chamber (30) which has an upstream and a downstream extremity (32, 34). The upstream extremity (32) is connected to the downstream end (22) of the tube bank (18), and the downstream extremity (34) is disposed adjacent to the forming wire (12). The arrangement is such that the stock (S) flows through the downstream end (22) of the tube bank (18) and through the up- stream extremity (32) of the slice chamber (30) so that the stock (S) is ejected from the downstream extremity (34) of the slice chamber (30) onto the forming wire (12). A plurality of supply conduits (36, 37) are connected to the upstream end (20) of the tube bank (18) with each supply conduit (36, 37) being connected to a stock diluting source (38) for permitting dilution of the stock (S) flowing into the tube bank (18). A control device (40) cooperates with the supply conduits (36, 37) for controlling the di- lution of the stock (S) flowing through at least some of the tubes of the tube bank (18) for controlling the cross-machine direction- al basis weight of the resultant web.
Metso Paper Inc.
Mitsubishi Heavy Industries Ltd.
Ridout & Maybee Llp
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