Paper making and fiber liberation – Apparatus – Automatic control
Reexamination Certificate
2003-04-15
2008-10-07
Hug, Eric (Department: 1791)
Paper making and fiber liberation
Apparatus
Automatic control
C162S198000, C162S262000, C162S263000, C162S346000, C162SDIG011, C700S128000
Reexamination Certificate
active
07431800
ABSTRACT:
A device and a method for on-line control of the fibre direction of a fire web (8), being manufactured from stock delivered from a headbox (3) through a discharge opening (11) defined by movable lips (9, 10), while using a fibre direction meter (12) located downstream and actuating members (14), which are allonged long the lips for regulation of the discharge opening as a response to individual control signals, each being a function of measured fibre direction values; wherein a control unit (13) receives the measured fibre direction values, calculates the control signals, and transmits these to the actuating members. According to the invention, the control unit identifies an array of fibre direction values, originating from positions in the cross direction of the fibre web which correspond to the positions of the actuating members. The control unit then compares the array of fibre direction values with an array of desired fibre direction values.
REFERENCES:
patent: 5833808 (1998-11-01), Shands et al.
patent: 6322666 (2001-11-01), Luontama et al.
patent: 6799083 (2004-09-01), Chen et al.
Ferm Johan
Hubinette Anders
Greer Burns & Crain Ltd
Hug Eric
Stora Enso AB
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