Method in reeling a paper or board web and a reel-up

The invention relates to a method in reeling a paper or board web according to the preamble of claim 1 and/or 3.

The invention also relates to a reel-up according to the preamble of claim 16 and/or 18.

The present invention relates more particularly to a method in reeling a paper or board web to a machine roll i.e. a roll corresponding the full-width of the web. The width of machine rolls is usually 2.0-10.0 m and the diameter 2.0-4.5 m naturally depending on the dimensioning of the paper or board machine.

As known from prior art, the machine reel-ups of a paper or board web are usually located at the end of the manufacturing line of the paper or board web and with them the completed paper web is reeled to a machine roll around a reeling shaft i.e. a so-called reeling drum. After this often follow on-line or off-line finishing apparatuses by means of which customer rolls according to customer requirements are manufactured of the paper or board web. In reeling-up taking place in machine reel-ups, a reeling cylinder arranged to a nip contact with the reeling shaft and a web roll forming around it is usually utilised. By means of nip load i.e. a force prevailing in the nip, simultaneously the quality of the web roll being produced is affected. As known from prior art, the nip load of the reeling nip affects the quality of the web roll being formed and, because of this, into connection with reel-ups are arranged measuring devices for measuring the nip load and adjustment devices for adjusting the nip load as the reeling advances. A problem of reel-ups of machine rolls of paper or board machines known from prior art is that measuring the nip load of the reel-up and, on the other hand, adjusting and profiling the nip load is problematic. As known from prior art, it is problematic to

measure the nip load of such a reel-up in which two nip loads simultaneously affect the reeling cylinder.

In some arrangements known from prior art, the reeling cylinder is stationary and the reeling roll around which the web roll is formed by means of the nip contact is arranged transferable as the reeling advances in the support structure e.g. on reeling rails. The prior-art reel-ups usually have a primary reeling position and a secondary reeling position, in which primary position the reeling of the web around a new reeling shaft is started and the web is reeled to a desired diameter, after which the reeling is transferred to the secondary position in which the reeling is continued as far as the desired diameter of the completed roll and from which position the completed web roll is transferred for further processing.

Into connection with reel-ups known from prior art, a spreader roll has been often arranged before the reeling nip in the incoming direction of the web with which the web is spread and a leading roll with which the web is led to the nip between the reeling cylinder and the web roll being formed.

As prior art, we refer to FI patent application 20002375 which describes a method in reeling and a reel-up, in which successive machine rolls are reeled from a paper web so that the machine roll which is becoming full is reeled apart from the device forming the first reeling nip in contact with the device forming the second reeling nip in the final reeling position.

As prior art, we also refer to US patent specification 5931406 which describes a reel-up for the continuous reeling of a paper web, in which a reeling cylinder is transferred from a nip contact with a paper roll being completed from underneath back to reeling rails into a nip contact with a new spool before changing the reeling to the new spool. The reeling cylinder is transferred with vertical and horizontal movements by means of a lifting table and a transfer means connected to it. The reeling cylinder moves vertically to establish one nip at a time with each

paper roll in sequence and to move out of the way of the horizontal motion of the roll moving towards its winding position.

US patent specification 5370327, for its part, describes a method and an apparatus for reeling a web roll, in which a reeling cylinder moves substantially vertically as the reeling advances and the reeling cylinder remains in contact with the web roll building continuously until a desired web roll diameter is reached. In this prior-art reel-up, reeling takes place in the same reeling carriage from start to finish i.e. the reel-up only comprises a primary carriage.

As prior art, we also refer to DE published application 10218722 which describes a reel-up in which the web being reeled is brought into connection with the reel- up by means of a basement arranged beneath the machine room and which utilises a stationary reeling cylinder and in which the reeling shaft is arranged movable by means of a type of a reeling arm by means of which the reeling shaft is transferred over the reeling cylinder.

As prior art, we further refer to US patent specification 6536705 which describes a method and an apparatus for reeling a material web, in which material web is reeled simultaneously as the reeling shaft and/or the reeling cylinders are moved cross-directionally i.e. traversed with respect to the direction of the incoming material web.

The object of the invention is to provide a method in reeling a paper or board web in which the afore-described problems and disadvantages and those which come out later have been eliminated or at least minimised.

The object of the invention is also to provide new arrangements in connection with reel-ups in order to enhance reeling-up and for simplifying the structure of the reel-up.

To achieve the afore-mentioned objects and those that come out later, the method according to the invention is mainly characterised in what is presented in the characterising part of claim 1 and/or 3.

Also, a reel-up according to the invention is mainly characterised in what is presented in the characterising part of claim 16 and/or 18.

In the method according to the invention, the reeling cylinder is transferred during reeling in different reeling stages substantially in a direction corresponding the principal incoming direction of the web coming to the reeling cylinder. In an advantageous embodiment of the method and the reel-up according to the invention, the direction of movement of the reeling cylinder is inclined in relation to the horizontal direction, whereby the direction of movement of the reeling cylinder being substantially the same as the principal direction of the incoming web, the direction of movement of the reeling cylinder forms an angle in relation to the horizontal direction, which angle is 30-60°, most suitably 45°. In another advantageous embodiment of the method and the reel-up according to the invention, the direction of movement of the reeling cylinder is substantially perpendicular in relation to the horizontal direction i.e. vertical, whereby also the direction of movement of the incoming web is substantially vertical in relation to the horizontal direction. The direction of movement of the reeling cylinder can slightly differ from the incoming direction of the web, in any event the maximum of +15°. In this context, it should be considered that if oscillation in the cross direction of the web according to an advantageous additional characteristic of the invention described later is applied in connection with the method and the device according to the invention, the oscillation changes the incoming direction of the web from the edges slightly back and forth. Then however, the direction of movement of the reeling cylinder corresponds the principal incoming direction of the web according to the invention, hi the method according to the invention, in which the reeling cylinder is transferred in different reeling stages substantially in the angle corresponding the incoming direction of the web coming to the reeling

cylinder, advantages are gained related to measuring the nip load, because in the arrangement according to the invention the force component caused by web tension to the measurements remains constant and does not affect the measurement results of the nip load. Then, inter alia, calculations required for defining the nip load are simplified.

According to the invention, reeling is started in a primary position of the reel-up in primary carriages from which, as the reeling advances, the reeling is changed to a secondary position to secondary carriages, whereby it is possible to optimise, inter alia, required transmissions of electric drives and, at the same time, to provide a straight direction of movement for the web roll being reeled during the primary stage and the secondary stage. Thus, there is no limitation for the maximum diameter of the web roll being reeled in the primary position in connection with the invention.

In the arrangement according to the invention, also the threading of the web for reeling is easier, because the leader strip can be conveyed in a straight line to the nip formed by the empty reeling shaft (reeling drum) and the reeling cylinder, which nip forms a holding point tightening the leader strip and the web, compared to prior-art reel-ups in which the reeling nip is behind the vertical axis of the reeling cylinder, whereby the leader strip has to be led by a more complicated route. In addition, in those arrangements according to the embodiments of the invention in which the direction of movement of the reeling cylinder is inclined in relation to the horizontal direction, there is no need for a separate leading roll after the spreader roll for leading the web to the reeling nip, whereby the structure of the reel-up is simplified.

In the method according to an embodiment of the invention and in the reel-up according to the invention, a reeling cylinder of large diameter is utilised, whereby a longer reeling nip is provided in the machine direction, whereby the reel-up is also more easily arrangable for different web widths. According to the

invention, the proportion of the diameter of the reeling cylinder to the width of the web being reeled is most suitably such that for the operational area is chosen an area above the curve defined by equation y=-0, 0009x3 + 0,025x2 - 0,2567x + 1,0903 in which;; = diameter of reeling cylinder/width of web being reeled and x = width of web being reeled. Then, a new operational area has been obtained in reeling which enables the use of different standard structure solutions irrespective of the size of the machine, whereby the number of components used can be minimised, simultaneously different geometric differences between different reel- ups are minimised in the area of the reeling nip. In this invention, it has been realised in a novel manner to define the dimensioning principles of the reeling cylinder totally different from the procedure of prior art in which the diameter dimensioning of the reeling cylinder has been defined based on deflection and vibration criteria and certain geometric conditions, whereby it has resulted in several different diameters of the reeling cylinder and thus to several different sizes and structural alternatives of the reel-ups, which has been reflected as high costs in manufacturing and in maintaining mechanics and automation models. Thus, according to the invention is also provided a longer reeling nip and a larger area of the reeling nip, whereby adjusting the nip load and, by means of it, affecting the structure of the roll being formed by means of the nip load are easier. Furthermore, the large diameter of the reeling cylinder provides that the problems caused by the deflection of the reeling cylinder are minimised. By means of the method and the reel-up according to this advantageous embodiment of the invention, also a long reeling nip is achieved, which is advantageous from the viewpoint of reeling quality. This embodiment also provides extra space for change devices especially when the reeling nip is closed. Similarly, there is more space for different actuators in the frame.

For the reel-up according to the invention, there is also no need to make a recess in the floor of the machine room for its movement, because the moving devices of the reeling cylinder can be positioned above the machine level. In arrangements known from prior art, when it has been necessary to make a recess for the

movement of the reeling cylinder, it has also been necessary to cut the floor joists, which has caused alteration work of concrete structures in connection with replacements, which are time-consuming and increase costs.

In the method and the reel-up according to the invention according to an advantageous exemplifying embodiment, the reeling cylinder and the forming web roll are also oscillated during reeling most advantageously from the start of reeling to the finish of the completed roll. By means of oscillation, web tension can be affected so that the web tension remains in the desired value. If the tension profile of the web is inclined, oscillation takes place inclined in relation to the cross direction of the web, whereby the tension profile can be corrected. The amount of oscillation can advantageously be adjusted by means of an advantageous measuring arrangement to be described in connection with the following embodiment of the invention by measuring the position of the web from the edge of the forming roll or the reeling nip by means of a pressure-sensitive measurement foil and to control the positions of the reeling cylinder and the machine roll and the amount of oscillation based on the measuring result.

In connection with the method according to the invention according to an advantageous embodiment of the invention, a pressure-sensitive foil, a so-called

EmFi foil, is utilised in measuring the nip load, by means of which measuring foil the nip load can be measured easily and accurately. Such a foil measuring application in measuring the nip load enables, inter alia, that if two nip forces prevail simultaneously in reeling, the nip force can be measured and adjusted from the side of the reeling cylinder and the definition of the forces of each nip is extremely accurate.

According to an advantageous measuring application according to the invention, a measuring foil is installed in a rotating roll, the reeling cylinder, and into connection with it quick measuring electronics, whereby a great sampling frequency and programmability of operation are obtained. Quick sampling and

synchronisation to a desired point in the cycle of the reeling cylinder are utilised in measuring several forces, whereby the position of the prevailing force/profile is obtained on the periphery of the reeling cylinder. The measuring foil can be positioned straight i.e. in the direction of the longitudinal axis of the reeling cylinder or spiral-shaped or in the direction of the periphery extending either to the whole periphery or a portion of it.

In this advantageous embodiment of the invention, there is no need for a separate tension-measuring roll, because the web tension can be measured directly from the reeling cylinders by means of the measuring foil. When using an embodiment in which the foil is positioned in the form of a spiral, also the measuring result between the nips is obtained in the change situation of the roll.

The method in reeling and the reel-up according to the invention can be applied when using a stationary secondary position as the secondary position of reeling and when using a movable secondary position.

According to the exemplifying embodiment of the invention in which the secondary position of the reel-up is stationary, primary reeling takes place in reeling carriages which move horizontally, most suitably positioned on rails. The stationary secondary position enables a larger diameter of the machine rolls, because then, when dimensioning the drive and structures, there is no need to consider the requirements of moving a massive machine roll nor the moving requirement of the drive. In this embodiment, the reeling nip is closed in the forming web roll during the whole reeling, whereby the nip load of reeling remains as desired and causes no discontinuity in reeling.

According to an advantageous additional characteristic of the invention, for controlling the nip force and the vibrations of the reel-up, a brake has been arranged into connection with the reeling cylinder which brake is available for use during reeling for damping the nip vibration so that no effects are created in

measuring the nip force. Furthermore, in possible fault situations, such as power failures or when the mechanical structure fails, the brake prevents the reeling cylinder, which moves on an inclined surface, from uncontrollably moving downwards.

The invention will now be described in more detail with reference to the figures of the accompanying drawing.

Fig. 1 schematically shows a reeling stage just before transferring reeling from a secondary position to a primary position i.e. a change stage.

Fig. 2 schematically shows a reeling stage in which a completed roll is in the secondary position and the reeling is transferred to the primary position.

Fig. 3 schematically shows a reeling stage in which the completed roll is delivered from the secondary position and the reeling is transferred from the primary position to the secondary position.

Fig. 4 schematically shows a reeling stage in which reeling carriages transfer to receive a next reeling shaft as the reeling continues in the secondary position.

Fig. 5 schematically shows a reeling stage just before transferring the reeling from the secondary position to the primary position i.e. a change stage.

Fig. 6 schematically shows a reeling stage in which the completed roll is in the secondary position and the reeling is transferred to the primary position.

Fig. 7 schematically shows a reeling stage in which the completed roll is delivered from the secondary position and the reeling is transferred from the primary position to the secondary position.

Fig. 8 schematically shows a reeling stage in which reeling carriages transfer to receive the next reeling shaft as the reeling continues in the secondary position.

Figs. 9-13 schematically show the stages taking place in the change situation of the embodiment according to Figs. 5-8 of the invention in more detail.

Fig. 14 schematically shows an embodiment of the invention which utilises the oscillation method.

Figs. 15-17 schematically show different embodiments of a measuring arrangement advantageously utilised in connection with the invention.

Figs. 18-19 schematically show advantageous measuring arrangements implemented in connection with the invention.

Fig. 20 schematically shows the operational area according to an example of a large-diameter reeling cylinder according to an embodiment of the invention.

Fig. 21 schematically shows an arrangement according to an advantageous additional characteristic of the invention for controlling nip force and vibration.

In the following figures, the same reference numbers are used of parts mainly corresponding each other if not otherwise stated.

Figs. 1-4 schematically show an embodiment of the invention to be utilised in reeling and a reel-up in which a stationary secondary position is utilised, and Figs. 5-8 schematically show an embodiment of the invention in which a movable secondary position is utilised and which has a nip closed change. Figs. 9-13 schematically show an embodiment of the invention in which a movable secondary position is utilised and which has a nip open change.

In the embodiments of the invention shown in Figs. 1-13 and the stages related to them, the movement of a reeling cylinder 10 substantially corresponds the incoming direction of a web W. Reeling is started in a primary position of the reel-up in primary carriages from which, as the reeling advances, reeling is changed to a secondary position to secondary carriages, whereby it is possible to optimise, inter alia, required transmissions of electric drives and, at the same time, to provide a straight direction of movement for a web roll 21, 22 being reeled during the primary stage and the secondary stage. According to an advantageous additional characteristic of the invention, the diameter of the reeling cylinder 10 is large and the diameter of the reeling cylinder 10 is defined so that the proportion of the diameter of the reeling cylinder to the width of the web being reeled is chosen such that for the operational area is chosen an area above the curve defined by equation y=-0, 0009x3 + 0,025x2 - 0,2567x + 1,0903 in which y = diameter of reeling cylinder/width of web being reeled and x = width of web being reeled, see the example of Fig. 20.

In the situation according to Fig. 1, the web W is reeled to a web roll 20 in a stationary secondary reeling position. A secondary drive 25 is connected to a reeling shaft 24. In the vicinity of the secondary position, there is a surface binding device 30. During reeling, the reeling cylinder 10 is in a nip contact with the forming web roll 20. The drive of the reeling cylinder 10 has been referred to with reference number 11, and the direction of movement of the reeling cylinder 10 with reference number SlO. In the situation described in the figure, the reeling is about to be changed around the next reeling shaft 21 which is provided with a primary drive 26 and positioned in reeling carriages (not shown in the figure). The reeling shaft 21 has been brought to a nip contact with the reeling cylinder 10 and the change is performed by means of a water-changing device 16 by cutting the web W and e.g. by means of an air-blowing device 17 by leading the web W around the reeling shaft 21. A spreader roll of the web W is designated with reference number 18. In the embodiment shown in the figure, the reeling carriages move on reeling rails 15. Dashed lines in the figure show also the reeling shafts of

forthcoming rolls with reference number 21' and their direction of movement in the transfer stage with reference arrows S21'.

In the situation according to Fig. 2, the reeling has transferred around the new reeling shaft 21 and the forming web roll has been designated with reference number 22. The surface of the completed roll 20 situated in the secondary position is bound with the surface binding device 30 for preventing the loosening of reeling (cf. e.g. Fig. 1). The surface binding device 30 has been transferred by a manner shown with arrow S30 from a stand-by position to a surface binding position (Fig. 2). In this stage, the reeling cylinder 10 and the forming new web roll 22 are transferred by a manner shown by arrows S21 and SlO apart from the web roll 20 in the secondary position.

In the situation shown in Fig. 3, the completed web roll 20' is transferred away from the secondary position. This transfer is shown with arrows S20. The surface binding device 30 has been detached from the web roll 30 and, in this stage, the forming web roll 22 is started to be transferred together with the reeling cylinder

10 from the primary position in a manner shown by arrows S21 and SlO towards the secondary reeling position. The forthcoming position of the forming paper roll 22 and the reeling cylinder 10 in the secondary position is shown with dashed lines.

According to what is shown in Fig. 4, when the web roll in reeling has been transferred to the secondary position, the web roll being reeled is designated again with reference number 20. The reeling carriages are returned, as shown with arrow SV, towards the next reeling shaft 21 which is transferred on the reeling rails towards the carriages for starting the reeling of the next web roll around the new reeling shaft 21, when the roll in the secondary position has grown to a desired diameter.

According to Figs. 1-4, a new reeling shaft is brought to the reel-up and run against the reeling cylinder. Then, the reeling cylinder is in a nip contact with both the starting roll and the completing roll. After a change performed by means of e.g. the water-cutting device or other change device known as such, the reeling cylinder is detached from the completing roll which is delivered for further processing from the secondary position. After the change in the secondary reeling position, the surface can be bound with the surface binding device for the duration of deceleration. The reeling cylinder transfers with the primary roll in the primary reeling position away and the reeling continues as primary reeling. After the delivery of the completed roll taken place in the secondary position, the reeling cylinder and the completing roll are transferred to the secondary reeling position. The reeling carriages are returned to the primary position to receive the next reeling shaft. The reeling is continued in the secondary reeling position, until it is time for the next reeling change.

As it is evident from Figs. 1-4, in this embodiment of the invention the reeling nip between the forming web roll 20, 22 and the reeling cylinder 10 is closed for the whole reeling process. As the reeling advances, there is no need to detach the reeling cylinder 10 from the reeling nip contact at any stage. Furthermore, it should be noted in this embodiment of the invention that the secondary reeling position is stationary, whereby the secondary drive 25 positioned to the stationary position can be utilised, whereby the dimensioning and choice of the drives of the construction are more diverse compared to previously known arrangements, as there is no need for a movability feature.

The reeling cylinder 10 moves as the reeling advances in the stages of Figs. 1-4 first in its direction of movement backwards away from the secondary position as the reeling has transferred around the new reeling shaft 21 off the completed web roll 20. When the completed roll 20 in the secondary position has been delivered from the secondary position, the reeling cylinder 10 transfers together with the roll 22 being transferred to the secondary position towards the secondary position

in the shown direction of movement and, as the reeling advances, the reeling cylinder 10 transfers so that loading in the reeling nip i.e. the nip pressure remains as desired. The direction of movement of the reeling cylinder corresponds according to the invention substantially the direction of the web coming to the reeling cylinder. In the method and the reel-up according to the invention, thus the direction of movement of the reeling cylinder being substantially the same as the direction of the incoming web, the direction of movement of the reeling cylinder forms an angle in relation to the horizontal direction, which angle is 30-60°, most suitably 45°. The direction of movement of the reeling cylinder can slightly differ from the incoming direction, in any event the maximum of +15°. With this are achieved, inter alia, those advantages that during reeling, there occurs no change of direction in the direction of the loading of the reeling cylinder during the same reeling, whereby the dead centres of reeling are avoided, and measuring and controlling the nip load prevailing in reeling are simplified.

In another embodiment of the invention shown in Figs. 5-8, in the situation of Fig. 5, the web W is reeled to the web roll 20 in the secondary reeling position. The secondary drive 25 is connected to the reeling shaft 24. During reeling, the reeling cylinder 10 is in a nip contact with the forming web roll 20. The drive of the reeling cylinder 10 has been referred to with reference number 11, and the direction of movement of the reeling cylinder 10 with reference number SlO. In the situation described in the figure, the reeling is about to be changed around the next reeling shaft 21 which is provided with the primary drive 26 and positioned in the reeling carriages (not shown in the figure). The reeling shaft 21 has been brought to a nip contact with the reeling cylinder 10 and the change is performed e.g. by means of the water-changing device 16 as shown in Fig. 1 by cutting the web W and e.g. by means of the air-blowing device 17 by leading the web W around the reeling shaft 21. The spreader roll of the web W is designated with reference number 18. In the embodiment shown in the figure, the reeling carriages move on the reeling rails 15. Dashed lines in the figure show also the reeling

shafts of forthcoming rolls with reference number 21' and their direction of movement in the transfer stage with reference arrows S21'.

hi the situation according to Fig. 6, the reeling has transferred around the new reeling shaft 21 and the forming web roll has been designated with reference number 22. The surface of the completed roll 20 situated in the secondary position is bound with the surface binding device 30 (not shown in the figure) for preventing the loosening of reeling, hi this stage, the reeling cylinder 10 and the forming new web roll 22 are transferred by a manner shown by arrows S21 and S 10 apart from the web roll 20 in the secondary position.

hi the situation shown in Fig. 7, the completed web roll 20' is transferred away from the secondary position. This transfer is shown with arrows S20. hi this stage, the forming web roll 22 is started to be transferred from the primary position together with the reeling cylinder 10 in a manner shown by arrows S21 and SlO towards the secondary reeling position.

According to what is shown in Fig. 8, when the web roll in reeling has been transferred to the secondary position, the web roll being reeled is designated again with reference number 20. The reeling carriages are returned, as shown with arrow SV, towards the next reeling shaft 21 which is transferred on the reeling rails towards the carriages, as shown with arrow S21, for starting the reeling of the next web roll around the new reeling shaft 21, when the roll in the secondary position has grown to a desired diameter. The movement of the reeling cylinder 10 as the forming web roll 20 grows has been designated with arrow SlO.

The reeling cylinder 10 moves as the reeling advances in the stages of Figs. 5-8 first in its direction of movement backwards away from the secondary position as the reeling has transferred around the new reeling shaft 21 off the completed web roll 20. When the completed roll 20 in the secondary position has been delivered from the secondary position, the reeling cylinder 10 transfers together with the

roll 22 being transferred to the secondary position towards the secondary position in the shown direction of movement and, as the reeling advances, the reeling cylinder 10 transfers so that loading in the reeling nip i.e. the nip pressure remains as desired. The direction of movement of the reeling cylinder corresponds according to the invention substantially the direction of the web coming to the reeling cylinder. In the method and the reel-up according to the invention, thus the direction of movement of the reeling cylinder being substantially the same as the direction of the incoming web, the direction of movement of the reeling cylinder forms an angle in relation to the horizontal direction, which angle is 30-60°, most suitably 45°. The direction of movement of the reeling cylinder can slightly differ from the incoming direction of the web, in any event the maximum of ±15°. With this are achieved, inter alia, those advantages that during reeling, there occurs no change of direction in the direction of the loading of the reeling cylinder during the same reeling, whereby the dead centres of reeling are avoided, and measuring and controlling the nip load prevailing in reeling are simplified.

Figs. 9-13 show in more detail the stages of the exemplifying embodiment of the invention described above in Figs. 5-8 when changing from a readily-reeled roll around a new reeling shaft.

In the situation according to Fig. 9, the web W is reeled to the web roll 20 in the stationary secondary reeling position and the next reeling shaft 21 is being transferred from the reeling shaft storage towards the change position. The surface binding device 30 of the roll 20 in the secondary position has been brought to contact with the web roll 20 and the roll 20 in the secondary position is transferred as shown by arrow S20.

In the situation according to Fig. 10, the reeling cylinder 10 transfers to receive the new reeling shaft 21. The movement of the reeling cylinder has been designated with arrow SlO and the movement of the new reeling shaft with arrow

S21. The roll 20 in the secondary position is transferred towards a felting position.

In the situation according to Fig. 11, the web roll 20 in the secondary position is completed and the surface has been bound with the surface binding device 30, and the web W going to the secondary position has been cut and the reeling of the web W has been transferred around the new reeling shaft 21 which reeling shaft is positioned in a nip contact with the reeling cylinder 10.

In the situation according to Fig. 12, the reeling has been started around the new reeling shaft 21 and the forming web roll has been designated with reference number 22. The completed web roll 20 in the secondary position and its surface has been bound with the surface binding device 30.

hi the situation according to Fig. 13, the completed roll 20 in the secondary position has been transferred for further processing, and the secondary position awaits the web roll 22 transferring from the primary position for reeling in the secondary position and the movement of the web roll is shown with arrow S21. During secondary reeling, the reeling cylinder 10 remains substantially in the same position i.e. the reeling cylinder 10 moves according to above described Figs. 10-11 during the change being stationary for the actual reeling, whereby as the reeling advances and the web roll grows, the centre of the web roll transfers farther from the reeling cylinder.

According to Fig. 14 according to an advantageous embodiment of the invention, during reeling the nip between the reeling cylinder 10 and the forming web roll 22 is oscillated by rotating the web around the vertical axis by moving the ends of the reeling cylinder 10 and the forming web roll 22 in the longitudinal machine (MD) direction such as shown in the figure with arrows O. The web W being reeled is led to the reeling cylinder 10 by means of the spreader roll 18 and a web leading roll 72 following it. Instead of the web leading roll 72, also an air rotation device can be utilised. The movement and the direction of movement of the reeling cylinder 10 has been shown with dashed lines in the figures. According to arrow

SlO, the direction of movement of the reeling cylinder 10 is substantially vertical and corresponds the incoming direction of the web W.

Figs. 15-17 show different installation alternatives for installing a sensor of a measuring arrangement in the form of a pressure-sensitive foil utilised in connection with the method and the reel-up according to the invention. The measuring arrangement is also applicable to be utilised in other paper- and board- machine applications which require a measuring application of several nips formed against the same roll, such as e.g. surface-gluing, pigmenting or coating film-transfer presses, calenders, on the press and in reel-ups utilised in connection with slitter- winders. Fig. 15 shows an alternative in which a sensor 50 has been installed directly in the direction of the longitudinal axis of the reeling cylinder 10 of the roll. In Fig. 16, the sensor 50 has been installed as a spiral sensor, whereby it is applicable for measuring profiles. The figure shows a so-called low spiral the angle of which in relation to the longitudinal direction of the axle of the reeling cylinder 10 of the roll would be from the viewpoint of resolution as large as possible but because of measuring-technical reasons smaller than sector β between the primary nip and the secondary nip shown in Fig. 18, whereby only one nip at a time can be measured. Fig. 17 shows sensors in the direction of the periphery installed on the surface of the reeling cylinder which sensors are applicable for measuring the forces and/or pressures directed on the surface of the reeling cylinder. As shown in the figure, the sensors 50 can be set to the whole length of the periphery of the reeling cylinder 10 or a portion of it.

m the measuring application utilised in connection with the invention, an EmFi foil is used as the sensor 50 which foil is a pressure sensor 50 which is applicable for sensing pressure or movement and its sensitivity is good even for a small movement. It measures dynamic form and the measurement takes place on the whole area of the sensor with the same weighting. This kind of measuring method is known as such, and the signal produced by the sensor is sampled and sent from

the reeling cylinder advantageously wirelessly forward for the processing of measuring results.

Fig. 18 shows a measuring arrangement utilised in connection with the method and the reel-up according to the invention for measuring several nip loads and profiles.

In the embodiment of Fig. 18 using the installation alternative according to Fig.

15, the total level of the linear load of both reeling nips Nl, N2 is measured with the same sensoring. The measurement can be made in the same cycle using quick sampling and synchronisation. First, the EmFi foil sensor 50 is reset by short- circuiting the terminals. After this, the level of the linear load of the nip Nl is measured when the sensor goes through the nip. Also the machine-direction form profile of the nip can be defined if required. After this, the sensor is reset again and the level of the linear load of the second nip N2 is measured. With the measuring electronics of the measuring arrangement, the sampling rate of 8,000 measurements/second is achieved so several measurements in the same cycle can be implemented with regard to this.

In the embodiment of Fig. 18 using the installation alternative 2 according to Fig.

16, the tension profile of both nips Nl, N2 is measured with the same sensoring as shown with arrows II. The measurement is made as above, but the sampled data describing the profile is recovered as the spiral goes through each nip. The spirals are very low, the cover in the direction of the periphery is advantageously shorter than the distance between the nips of the primary and the secondary reeling. Also the total profile of the linear load can be calculated from the signal of the spiral sensor.

Fig. 19 shows the measuring of a web tension profile with the measuring arrangement utilised in connection with the method and the reel-up according to the invention. The measurement can be performed using the installation

alternative according to Fig. 15, in which the total level of web tension is measured before the secondary nip or by using the installation alternative according to Fig. 16 in which a tension profile is measured. In this context, it is also possible to measure the nip load profile from several nips and the total level of the nip load from several nips and the profile and the level of web tension with one sensoring. In a situation which involves also the primary nip, web tension or a web tension profile can be measured depending on the construction between the primary and the secondary nip or before the primary nip. The sampling can be focused on the periphery to the point in which the measurement is wished to be made.

From the schematic example of Fig. 20, a new operational area enabled by a large-diameter reeling cylinder according to an advantageous embodiment of the invention becomes evident. The proportion of the diameter of the reeling cylinder to the width of the web being reeled is on the vertical axis y of the figure and the web width is on the horizontal axis. The new operational area T being enabled according to the invention is located above curve c which is defined by equation y=-0,0009x3 + 0,025x2 - 0,2567x + 1,0903. In this invention, it has been realised in a novel manner to define the dimensioning principles of the reeling cylinder totally different from the procedure of prior art in which the diameter dimensioning of the reeling cylinder has been defined based on deflection and vibration criteria and certain geometric conditions, whereby it has resulted in several different diameters of the reeling cylinder and thus to several different sizes and structural alternatives of the reel-ups, which has been reflected as high costs in manufacturing and in maintaining mechanics and automation models. By means of the method and the reel-up according to this advantageous embodiment of the invention, also a long reeling nip is achieved, which is advantageous from the viewpoint of reeling quality. This embodiment also provides extra space for change devices especially when the reeling nip is closed, and there is also more space for different actuators in the frame.

According to an advantageous additional characteristic of the invention according to Fig. 21, for controlling the nip force and the vibrations of the reel-up, a brake 60 has been arranged into connection with the reeling cylinder 10 which brake is available for use during reeling for damping the nip vibration so that no effects are created in the nip force measuring. Furthermore, in possible fault situations, such as power failures or when the mechanical structure fails, the brake 60 prevents the reeling cylinder 10, which moves on an inclined surface, from uncontrollably moving downwards. The brake 60 is positioned into connection with the loading/moving actuator of the reeling cylinder 10 between the nip-force measuring and the loading actuator 65, whereby it has no effect on nip-force measuring nor causes problems in adjusting the nip force. The brake force of the brake 60 can be adjusted so that during reeling the brake 60 is used with a set small, nip-vibration damping force and in failure situations if required with a force preventing the uncontrollable movement of the reeling cylinder 10. The brake 60 can be e.g. a spring-loaded hydraulic brake. A brake according to an embodiment comprises a friction shoe which is arranged for braking against an arm of the actuator or along a sliding block fastened in the loop of the actuator. According to an embodiment, the brake can also comprise a combination of a screw and a hydraulic cylinder which comprises an active brake part/damper. Brake-force measuring can be arranged into connection with the friction surfaces of the brake, whereby e.g. there is a brake part between the loop of the hydraulic cylinder and the force sensor from which braking is done with brake shoes. Implemented as described above, brake-force measuring is also applicable to be utilised in other paper- and board-machine devices, such as e.g. surface-gluing, pigmenting or coating film-transfer presses, calenders, on the press and in reel-ups utilised in connection with slitter-winders.

The invention was described above only referring to one of its advantageous embodiments, to the details of which the invention is, however, by no means intended to be narrowly confined.