Method and control device for paper web profile control with plurality of sensors

A paper quality control device for controlling at least one of the cross-machine direction profile and the machine direction profile of at least one quality feature of a paper web as it is being produced in a paper making machine, the paper quality control device comprising:

• a controller for receiving signals from a sensor and for driving and controlling an actuator;
• at least one actuator which is connected with the controller and is operable by the controller for influencing at least one of the cross-machine direction profile and the machine direction profile of the at least one quality feature of the web;
• at least a first sensor for picking up a first measured signal of at least one of a first cross machine direction profile and a first machine direction profile of the quality feature of the paper web being produced and for supplying the first signal to the controller;
• at least a second sensor spaced in the machine direction from the first sensor for picking up a second measured signal of at least one of a second cross-machine direction profile a second machine direction profile related to one of the quality features of the web and for supplying the second signal to the controller;
• at least one of the first and second sensors moves along the cross-machine direction;
• the controller receiving signals from the first and second sensors and being adapted to drive the actuator to adjust or control at least one of the cross-machine direction and machine direction profiles of the one quality feature of the web.

A paper quality control device for controlling at least one of the cross-machine direction profile and the machine direction profile of at least one quality feature of a paper web as it is being produced in a paper making machine, the paper quality control device comprising:

• a controller for receiving signals from a sensor and for driving and controlling an actuator;
• at least one actuator which is connected with the controller and is operable by the controller for influencing at least one of the cross-machine direction profile and the machine direction profile of the at least one quality feature of the web;
• a first sensor adapted to and positioned for picking up a first measured signal of the cross-machine direction profile of a first quality feature of the paper web, the first sensor being connected with the controller for supplying a first signal to the controller;
• a second sensor adapted to and positioned at a spaced position in the machine direction from the first sensor for picking up a second measured signal of the machine direction profile of the first quality feature of the web, the second sensor also being connected with the controller for supplying a second signal to the controller;
• the controller receiving signals from the first and second sensors and being adapted to drive the actuator to adjust or control at least one of the cross-machine direction and machine direction profiles of the one quality feature of the web.

A method for control of one of a cross-machine direction profile and a machine direction profile of a quality feature of a paper web in a paper manufacturing process, the method comprising:

• measuring at least one of a first cross machine direction profile and a first machine direction profile of the one quality feature at least one point on a paper making machine on which the process is performed;
• picking up at a second point spaced in the machine direction from the first point at least one further measured variable that is characteristic of at least one of a second cross machine direction profile and a second machine direction profile of a second quality feature;
• processing the measurements of the profiles;
• and
• using the processed measurements for influencing at least one of the cross machine direction profile and the machine direction profile of one of the measured quality features in the paper manufacturing process.