US 2026/0168174 A1Published application

A paper machine

AssigneeValmet Corporation

InventorScott WIGHTWICK

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Abstract

A paper machine (1; 101; 201; 301) and a method for controlling the paper machine. Said paper machine comprises at least two dryness sensors (9a-p) which are positioned at separate positions of a machine direction, (MD), of the paper machine, said dryness sensors being configured for measuring a dryness profile over a cross direction, (CD), of the paper web (7). Said paper machine further comprises at least two drying devices (13a-e) positioned at separate positions of the machine direction, (MD), of the paper machine and configured for drying said paper web in said paper machine and a control unit (11) which is connected to the dryness sensors and to the drying devices, wherein said control unit is configured to control said drying devices such that a drying of the paper web performed by said drying devices is adjusted in dependence of said measured dryness profile of the paper web from at least two different positions along the machine direction, (MD).

Claims23

Dependent claims

A paper machine (1;

101;
201;
301) comprising different machine sections (3a-d:
103a-d;
203a-e;
303a-d) configured for at least forming, dewatering and drying a paper web (7) being formed and transferred along a machine direction, MD, of the paper machine (1;
101;
201;
301), wherein said paper machine further comprises:
at least two dryness sensors (9a-p) which are positioned at separate positions of the machine direction, MD, of the paper machine, said dryness sensors being configured for measuring a dryness profile over a cross direction, CD, of the paper web (7);
at least two drying devices (13a-e) positioned at separate positions of the machine direction, MD, of the paper machine and configured for drying said paper web in said paper machine;
and
a control unit (11) which is connected to the dryness sensors (9a-p) and to the drying devices (13a-e), wherein said control unit (11) is configured to control said drying devices (13a-e) such that a drying of the paper web (7) performed by said drying devices (13a-e) is adjusted in dependence of said measured dryness profile of the paper web (7) from at least two different positions along the machine direction, MD.

10 more elements

A method for controlling a paper machine (1;

101;
201;
301) comprising different machine sections (3a-d:
103a-d;
203a-e;
303a-d) configured for at least forming, dewatering and drying a paper web (7) being formed and transferred along a machine direction, MD, of the paper machine (1;
101;
201;
301), said method comprising the steps of:
measuring (S1) a dryness profile over a cross direction, CD, of the paper web (7) in at least two different positions along a machine direction, MD, of the paper machine, wherein said measuring is performed by at least two dryness sensors (9a-p) which are positioned at separate positions of the machine direction, MD, of the paper machine;
and
controlling (S2) at least two drying devices (13a-e) which are positioned at separate positions in the machine direction, MD, of the paper machine, such that a drying of the paper web (7) performed by said drying devices (13a-e) is adjusted in dependence of said measured dryness profile of the paper web (7) from at least two different positions along the machine direction, MD, said controlling being performed by a control unit (11) which is connected to the dryness sensors (9a-p) and the drying devices (13a-e).

9 more elements

Dependencies are inferred from the claim text.