Dewatering element having non-pulsing dewatering followed by...

Details Dewatering element having non-pulsing dewatering followed by... Dewatering element having non-pulsing dewatering followed by...

2006-05-02

2009-02-17

Halpern, Mark (Department: 1791)

Paper making and fiber liberation

Processes and products

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

C162S352000, C162S374000, C162S211000, C162S300000

Reexamination Certificate

active

07491295

ABSTRACT:
A forming section of a paper or board machine10in the forming section of a paper or board machine has a cover36having an outlet groove20between a suction zone18of circular holes and an outlet edge40. A wire comes to the cover area from an inlet edge38and leaves from an outlet edge40. The outlet groove20is essentially in the cross-machine direction of the cover36. The suction zone accomplishes non-pulsating dewatering, and the outlet groove accomplishes pulsating dewatering. The non-pulsating suction zone first accomplishes good retention, and after this formation is improved on the outlet groove. When pulsating dewatering takes place in the same direction as non-pulsating dewatering and immediately after non-pulsating dewatering, the web formed has a particularly good formation potential. Potential marking caused by non-pulsating dewatering can also be removed efficiently by means of pulsating dewatering taking place on the same side.

REFERENCES:
patent: 1917098 (1933-07-01), Cofrin
patent: 6372091 (2002-04-01), Wildfong et al.
patent: 7364643 (2008-04-01), Poikolainen et al.
patent: 2004/0188050 (2004-09-01), Henssler
patent: 2008/0115902 (2008-05-01), Poikolainen et al.
patent: WO 2004/018768 (2004-03-01), None

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