Method and equipment for cleaning and maintaining rolls

A method for cleaning and maintaining a set of rolls of a paper machine or board machine, wherein the set of rolls is equipped with a soiling monitoring apparatus, and a controllable cleaning device, which is controlled by a control system, the method comprising the steps of:

• monitoring the surface of the web by a fault detection system, and delivering the detected information to the control system;
• detecting and localizing the soiled part of a roll by the soiling monitoring apparatus;
• and
• delivering information on the detection and location of soiling on the rolls gathered by the soiling monitoring system to the control system of the cleaning device, and according to a control command of the control system, controlling the cleaning device to remove the detected soiling from the rolls, wherein the cleaning device cleans all the rolls of the set of rolls in turn.

A method for maintaining the surface of a roll of a paper machine or board machine, over which a web passes in a paper or board machine or paper or board finishing machinery executing a paper or board production process or a finishing process, comprising the steps of:

• continuously monitoring the surface of the web and/or the roll automatically in order to detect deviations;
• if a deviation is detected on the web or on the surface of the roll in the automatic monitoring, momentarily spreading with liquid at least part of the width of the surface of the roll or the web during the running of the machine, at the same time as the web runs over the surface of said roll;
• and
• allowing die spread liquid and possible extra substances to be carried away with the web that runs over the surface of the roll.

An apparatus for cleaning a roll of a paper machine or board machine comprising:

• a cleaning device for cleaning the roll;
• a control system for controlling the cleaning device;
• a soiling monitoring apparatus for detecting the soiled part of the roll, and arranged to deliver the detected information to the control system;
• and
• a fault detection system positioned to detect faults in the web and arranged to deliver the detected information to a control system, the control system being operable to control the cleaning device to remove soiled parts of the roll, wherein the cleaning device comprises a liquid spreading device and an arrangement far carrying away liquid and possible extra substances with the web as it runs over the surface of the roll.

An apparatus for cleaning a roll of a paper machine or board machine comprising:

• a cleaning device for cleaning the roll;
• a control system for controlling the cleaning device;
• a soiling monitoring apparatus for detecting the soiled next of the roll, and arranged to deliver the detected information to the control system;
• and
• a fault detection system positioned to detect faults in the web and arranged to deliver the detected information to a control system, the control system being operable to controlling the cleaning device to remove soiled parts of the roll, wherein the cleaning device comprises a laser doctor comprising:
• a laser light source;
• and
• a lens in which the power and direction of the laser beam are adjustable.

An apparatus for cleaning a roll of a paper machine or board machine comprising:

• a cleaning device for cleaning the roll;
• a control system for controlling the cleaning device;
• a soiling monitoring apparatus for detecting the soiled part of the roll, and arranged to deliver the detected information to the control system;
• and
• a fault detection system positioned to detect faults in the web and arranged to deliver the detected information to a control system, the control system being operable to control the cleaning device to remove soiled parts of the roll, wherein the cleaning device has a doctor blade which comprises blade parts that can be placed in operation in zones for doctoring the rolls of a set of rolls over the whole length or part of the length of said rolls.

An apparatus far cleaning a roll of a paper machine or board machine comprising:

• a cleaning device for cleaning the roll;
• a control system for controlling the cleaning device;
• a soiling monitoring apparatus for detecting the soiled part of the roll, and arranged to deliver the detected information to the control system;
• a fault detection system positioned to detect faults in the web and arranged to deliver the detected information to a control system, the control system being operable to control the cleaning device to remove soiled parts of the roll;
• and
• a plurality of rolls in a roll stack, and wherein the cleaning device is arranged to traverse in the vertical and horizontal directions along the whole dimension of the roll stack.

An apparatus for maintaining the surface of a roll in a paper machine or board machine performing a paper or board production process or a finishing process or in paper or board finishing machinery, which includes members for guiding a web over the surface of a roll, the apparatus comprising:

• at least one automatic monitoring device which is arranged to continuously monitor the web and/or the surface of the roll;
• a data processing device which is connected to the monitoring device;
• a liquid spreading device which is connected to the data processing device and arranged to spread a liquid onto the surface of the roll or the web based on commands given by the data processing device;
• and
• an arrangement that enables the liquid and possible extra substances to be carried away with the web that runs over the surface of the roll.