초록 ▼

Method and arrangement for controlling the temperature of two cylinders forming a nip. The temperature of at least one point on each cylinder is sensed by sensors, forming a point of measuring, wherein the highest sensed temperature is used as set point and wherein the cylinders are heated in areas

Method and arrangement for controlling the temperature of two cylinders forming a nip. The temperature of at least one point on each cylinder is sensed by sensors, forming a point of measuring, wherein the highest sensed temperature is used as set point and wherein the cylinders are heated in areas where the sensed temperature is below the set point.

대표청구항 ▼

1. An arrangement configured to score a web of paper or laminated material comprising: two cylinders positioned relative to one another to form a nip between the two cylinders to receive the web of paper or laminated material;a plurality of sensors positioned adjacent one of the cylinders to measure

1. An arrangement configured to score a web of paper or laminated material comprising: two cylinders positioned relative to one another to form a nip between the two cylinders to receive the web of paper or laminated material;a plurality of sensors positioned adjacent one of the cylinders to measure the temperature at specific points of measuring on the one cylinder or parts associated with the one cylinder and provide output indicating the temperature at the specific points of measuring on the one cylinder;a plurality of heaters, each heater being associated with a different one of the points of measuring to apply heat to an area around the point of measuring of the cylinder based on the output from the sensors;one of the cylinders including at least one projection positioned in a groove formed in an outer surface of the other cylinder to score the web of paper or laminated material in the nip; anda controller configured to control operation of the plurality of heaters, based on the output from the plurality of sensors indicating the temperature at the specific points, so that the temperature at each of the specific points of the cylinder is the same to avoid uneven heating of the one cylinder and allow the web of paper or laminated material to be scored by cooperation of the projection and the groove without cutting the web of paper or laminated material. 2. The arrangement of claim 1, wherein the plurality of sensors is a first plurality of sensors and the plurality of heaters is a first plurality of heaters, further comprising a second plurality of sensors positioned adjacent the other cylinder forming the nip to measure the temperature at specific points of measuring on the other cylinder and provide output indicating the temperature at the specific points of measuring on the other cylinder, and a second plurality of heaters each associated with a different one of the points of measuring on the second cylinder to apply heat to an area around the point of measuring of the second cylinder based on the output from the second plurality of sensors. 3. The arrangement of claim 2, wherein the sensors are IR-sensors and wherein the heaters each include a number of IR-carbon light heaters on a support. 4. The arrangement of claim 3, wherein a shield is placed between each sensor and the associated heater, each shield extends radially from the cylinder. 5. The arrangement of claim 2, wherein temperature sensors are in bearing housings of the cylinders and wherein air heaters are in the bearing housings. 6. The arrangement of claim 1, wherein at least one cylinder of the nip is movable in relation to the other cylinder. 7. The arrangement of claim 6, wherein the sensors and the heaters are connected to a controller and wherein the controller is a computer or CPU containing a control algorithm. 8. The arrangement of claim 1, wherein cooling means are arranged at each of the cylinders to cool each cylinder. 9. An arrangement configured to score a web of paper or laminated material comprising: two cylinders positioned relative to one another to form a nip between the two cylinders to receive the web of paper or laminated material;a plurality of sensors positioned adjacent one of the cylinders to measure the temperature at specific points of measuring on the one cylinder or parts associated with the one cylinder and provide output indicating the temperature at the specific points of measuring on the one cylinder;a plurality of heaters longitudinally spaced apart along the one cylinder, each heater being associated with a different one of the points of measuring to apply heat to an area around the point of measuring of the one cylinder based on the output from the sensors;one of the cylinders including at least one projection positioned in a groove formed in an outer surface of the other cylinder to score the web of paper or laminated material in the nip; anda controller configured to control operation of the plurality of heaters, based on the output from the plurality of sensors indicating the temperature at the specific points, so that the temperature at each of the specific points on the one cylinder is the same to avoid uneven heating of the one cylinder and allow the web of paper or laminated material to be scored by cooperation of the projection and the groove without cutting the web of paper or laminated material. 10. The arrangement of claim 9, wherein the two cylinders are spaced apart from one another, and each of the plurality of heaters is positioned outside the one cylinder and is positioned in facing relation to an outer periphery of the one cylinder. 11. An arrangement configured to score a web of paper or laminated material comprising: two cylinders positioned relative to one another to form a nip between the two cylinders to receive the web of paper or laminated material;a plurality of sensors positioned adjacent one of the cylinders to measure the temperature at specific points of measuring on the one cylinder or parts associated with the one cylinder and provide output indicating the temperature at the specific points of measuring on the one cylinder;a plurality of heaters, each heater being associated with a different one of the points of measuring to apply heat to an area around the point of measuring of the cylinder based on the output from the sensors;one of the cylinders including at least one projection and an outer surface of the other cylinder including a groove, the at least one projection being positionable in the groove in the outer surface of the other cylinder to score the web of paper or laminated material in the nip; anda controller configured to control operation of the plurality of heaters, based on the output from the plurality of sensors indicating the temperature at the specific points, so that the temperature at each of the specific points of the cylinder is the same to avoid uneven heating of the one cylinder and allow the web of paper or laminated material to be scored by cooperation of the projection and the groove without cutting the web of paper or laminated material.