Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Reexamination Certificate
2005-02-15
2005-02-15
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
C162S263000, C162S252000, C162S259000, C162S300000, C162S301000, C162S203000, C073S159000
Reexamination Certificate
active
06855230
ABSTRACT:
In a paper or board machine, the cross-direction profile of a flow channel defined between a first dewatering element (52, 53) situated inside a first forming wire loop (50) and a second dewatering element (64, 65) situated inside a second forming wire loop (60) is measured, and the location and/or the position of the blade element (64, 65) is adjusted based on the measurement result in order to regulate the thickness profile of a stock flow. The measurement can be by passing an alternating current of low frequency to a current rail situated in the second dewatering element (64, 65) and by measuring the strength of the magnetic field created by it by at least two measuring devices which have been placed either in the first dewatering element (53) or, when the first dewatering element is a forming roll (52), in the same dewatering element (64) as the current rail.
REFERENCES:
patent: 5530346 (1996-06-01), Varpula et al.
patent: 5552021 (1996-09-01), Illvespaa et al.
patent: 92940 (1994-10-01), None
patent: 103995 (1994-12-01), None
patent: WO 0198581 (2001-12-01), None
Translation of Finnish Patent Application No. 942027, corresponding to Finnish Patent No. 103995; Dec. 1994.
Translation of Finnish Patent Application No. 932793, corresponding to Finnish Patent No. 92940; Oct. 1994.
Search Report issued in Finnish Priority Application No. 20001391.
International Search Report issued in International Patent Application No. PCT/FI01/00544.
International Preliminary Examination Report issued in International Patent Application No. PCT/FI01/00544.
Salminen Kari I.
Sorsa Jukka
Virtanen Pasi
Halpern Mark
Metso Paper Inc.
Stiennon & Stiennon
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