A roll for a machine for producing and/or processing a fibrous web, such as a paper, board or tissue web, has a circular-cylindrical main roll body. A roll cover covers the circumferential surface of the main roll body, at least in some segments. A pressure- and/or temperature-sensitive sensor is embedded in the roll cover. The sensor connects to an electrical and/or optical signal line. The signal line has a first line segment inside the roll. A second line segment extends substantially outside the roll and is connectable to a signal excitation and/or signal processing unit at one end. An electrical and/or optical rotational connection connects the first and second line segments to allow the line segments to be rotated relative to one another. When the roll is rotated, the first line segment rotates together with the main roll body. The second line segment does not have to follow the rotation.

The present invention relates to an arrangement (1) for measuring the temperature of a web. The arrangement (1) comprises a plurality of sensors (3) for contactless measuring of the temperature, an elongated housing (5) intended for extending essentially along a transverse direction (T) which is transverse to the direction of movement of a web. The sensors (3) are arranged in a chamber (6) within the housing (5) and spread along the front side (7a) of the housing (5). Each sensor (3) is connected to a data bus (9) for providing information of the measured temperature to other systems and/or apparatuses. The sensors (3) are attached to a support structure (19) having at least one rotatable shaft (23) in the interior of the housing (7), and wherein the shaft (23) is arranged to rotate the support structure (19) such that the sensors (3) are displaced to a calibration and/or protection position away from the openings (11) for calibration and/or protection of the sensors (3). The invention also relates to a method for measuring the temperature of a web, a computer program, a computer readable medium and a control unit.

A sheet manufacturing apparatus includes: a second web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and a sheet former that forms a sheet of the web formed by the second web former. The sheet former has a former roller unit and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.

A sheet manufacturing apparatus includes: a second web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and a sheet former that forms a sheet of the web formed by the second web former. The sheet former has a former roller unit and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.

The present invention relates to an arrangement (1) for measuring the temperature of a web. The arrangement (1) comprises a plurality of sensors (3) for contactless measuring of the temperature, an elongated housing (5) intended for extending essentially along a transverse direction (T) which is transverse to the direction of movement of a web. The sensors (3) are arranged in a chamber (6) within the housing (5) and spread along the front side (7a) of the housing (5). Each sensor (3) is connected to a data bus (9) for providing information of the measured temperature to other systems and/or apparatuses. The sensors (3) are attached to a support structure (19) having at least one rotatable shaft (23) in the interior of the housing (7), and wherein the shaft (23) is arranged to rotate the support structure (19) such that the sensors (3) are displaced to a calibration and/or protection position away from the openings (11) for calibration and/or protection of the sensors (3). The invention also relates to a method for measuring the temperature of a web, a computer program, a computer readable medium and a control unit.

Described herein are methods and systems for reducing, preventing, or eliminating wrinkles in a paper sheet during papermaking. The systems may include a dryer configured to dry a continuous paper sheet having a travel direction. The system may also include at least one roll configured to receive the dried continuous paper sheet. The systems may also include an air spreader located downstream of the dryer and upstream of the at least one roll. The at least one roll may include one or more calendering rolls. The air spreader may include a plurality of nozzles configured to expel a gas toward the dried sheet. The nozzles may be oriented in a direction at least partially opposed to the travel direction of the dried sheet.

Described herein are methods and systems for reducing, preventing, or eliminating wrinkles in a paper sheet during papermaking. The systems may include a dryer configured to dry a continuous paper sheet having a travel direction. The system may also include at least one roll configured to receive the dried continuous paper sheet. The systems may also include an air spreader located downstream of the dryer and upstream of the at least one roll. The at least one roll may include one or more calendering rolls. The air spreader may include a plurality of nozzles configured to expel a gas toward the dried sheet. The nozzles may be oriented in a direction at least partially opposed to the travel direction of the dried sheet.

A fiber body production apparatus includes a forming mechanism that forms a mixture, a pressing unit that transports the mixture while pressing the mixture, a peeling blade that peels the mixture from the pressing unit, a cleaner that cleans the pressing unit, and a shaping mechanism that shapes the mixture, after a rear end of the mixture passes through the pressing unit, the pressing unit is reversely rotated to move foreign matter adhering to the peeling blade to the pressing unit, after the roller is reversely rotated by a predetermined amount, the pressing unit is rotated forward to transport the foreign matter, compress the foreign matter on the pressing unit, and cause the compressed foreign matter to pass between the peeling blade and the pressing unit, and the cleaner removes the transported foreign matter from the pressing unit.