CA2627707C

CA2627707C - Method of winding web reel and web winding apparatus

Info

Publication number: CA2627707C
Application number: CA2627707A
Authority: CA
Inventors: Kenneth Akerlund; Jari Paanasalo
Original assignee: Metso Paper Oy
Current assignee: Metso Paper Oy
Priority date: 2007-03-30
Filing date: 2008-03-28
Publication date: 2012-05-29
Anticipated expiration: 2028-03-28
Also published as: CN101274718B; DE102008016014B4; FI20075208A; FI20075208A0; AT505474A3; CA2627707A1; AT505474B1; AT505474A2; DE102008016014A1; FI120192B; ITMI20080517A1; CN101274718A

Abstract

The object of the present invention is a method for winding a web reel by a carrier-roll winder (10), in which method, the web is wound around cores radially supported by a first (14) and a second carrier roll (12) or equivalent and in which the centre part of the reel is supported in the axial direction of the reel to a core locking device (20) by means of a core socket (31), which core locking device has a substantially vertical degree of freedom (22) and a horizontal degree of freedom (24). The winding event comprises at least a first step in which the motion of the centre of the reel being formed is guided in the direction of the substantially vertical degree of freedom of the core locking device (20) by displacing the first carrier roll (14) in relation to the second one and the substantially horizontal degree of freedom of the core locking device is lockable.

Description

Method for winding web reel and web winding apparatus [001] The invention relates to a method for winding a web reel by a carrier-roll winder, in which method, the web is wound around cores radially supported by a first and a second carrier roll or equivalent and in which the centre part of the reel is supported in the axial direction of the reel to a core locking device by means of a core socket, which core locking device has a first degree of freedom in the direction of the plane of the end of the reel.

[002] The invention also relates to a web winding apparatus, which comprises a first and a second carrier roll supported by which the web reel is formable, a guide arrangement which is substantially vertical in relation to a plane formed by the rotation axes of the first and the second roll, a core locking device fitted in the guide arrangement which forms for the core locking device its first degree of freedom in the direction of the plane of the end of the reel being formed, and displacement elements of the core locking device which allow the core locking device its second degree of freedom in the direction of the plane of the end of the reel being formed, deviating from the direction of the first degree of freedom.

[003] Also, slitter-winders are known from prior art in which carrier roll winders of variable geometry are used for winding partial rolls after the slitting of the web in which one or both of the carrier rolls/sets of rolls carrying the reel are displaceable. On such variable-geometric slitter-winders, the horizontal location of the centre of the reel being formed depends on the position of the carrier rolls/sets of rolls in relation to each other and the diameter of the reel. On the winders, reels are wound around cores.
Longitudinal successive cores are locked in place as a core array by a core locking device located at both ends. From prior art is known a core locking device which is located on a guide arranged into connection with the winder movable when the diameter of the reel increases as its centre is displaced. Thus, the position of the core locking device changes during run. The position of the core locking device moving away from the carrier rolls on the guide also changes when the direction of motion of the centres of the reels being formed changes, when one or both rolls are displaced on the variable-geometric winder as the winding proceeds.

[004] Thus, the core locking device has to have, in addition to the rotational motion of the reels supported in the axial direction to be controlled, a substantially uertical degree of freedom which is mainly responsible for the motion caused by the increase of the reel diameters and a substantially horizontal degree of freedom which is required because, e.g. due to the asymmetric geometry of the winder, the motion of the centre line of the reels is not linear and straight.

[005] Specification Fl 116281 describes a core locking device which is fitted in a carriage moving on guides pivotedly at the end of a support arm. By means of this, the above-mentioned substantially vertical and horizontal motion of the centre of the reels can be implemented during winding. When the core locking device rotates, the rotated core locking device and its support arm cause force in the centrs of the reel which force is dependent on the rotation angle and the mass of the device. However, this type of arrangement requires continuous control of relieving force and the mass of the core lock also affects the vibration properties of the core locking device.

[006] The object of the invention is indeed to provide a web winding device and a method by which the control of the winding process will be simpler.

[007] In this context, the terms carrier-roll winder, carrier roll and winding roll should be understood such that the word roll means a roll, an entity of several rolls and an endless belt loop or equivalent. Furthermore, the existence of the vertical and horizontal degree of freedom here means that the motion -can include a component in this direction, but the direction of the resultant of the components, the actual motion can deviate from the vertical and horizontal direction.

[008] The objects of the invention are achieved according to its first embodiment with a method for winding a web reel by a carrier-roll winder, in which method, the web is wound around cores radially supported by a first and a second carrier roll or~equivalent and in which the centre part of the reel is supported in the axial direction of the reel to a core locking device by means of a core socket, which core locking device has a first degree of freedom in the direction of the plane of the end of the reel. It is characteristic of the invention that the winding event comprises at least a first step in which the motion of the centre of the reel being formed is substantially guided in the direction of the first degree of freedom of the core locking device by displacing the first carrier roll in relation to the second carrier roll during winding.

[009] This way, the core locking device forms in winding a very rigid entity, which improves the quality of the winding process. According to an embodiment, the structure of the core locking device is such that it only has the first degree of freedom in the direction of the plane of the end of the reel. Then, its mass is smaller and it is thus more advantageous from the viewpoint of controlling vibrations.

[0010] The core lock has thus at least the first degree of freedom in the direction of the plane of the end of the reel being formed. According to an advantageous embodiment, the core lock also has the second degree of freedom in the direction of the plane of the end of the reel, the direction of which deviates from the direction of the first degree of freedom. This enables a more flexible control of the winding process.

[0011] According to this embodiment, the winding event comprises a second step in which the positions of the first and the second carrier roll are kept unchanged and in which the second degree of freedom of the core locking device is locked and released periodically such that force smaller than predetermined is applied to the winding core and/or the core locking device during the second degree of freedom of the core locking device being locked. In this winding step, the centre of the reel is displaced mainly in the direction defined by the increase of the reel. The position of the carrier rolls in relation to each other has an impact on the vibration behaviour of the apparatus. For this reason, the procedure in accordance with the second step according to the invention is necessary in certain conditions. However, many other issues affect the winding event, such as paper grade, the geometry and structure of the apparatus, run speed and reel size.

[0012] According to an advantageous embodiment, the core locking device also has the second degree of freedom in the direction of the plane of the end of the reel, the direction of which deviates from the dirsction of the first degree of freedom.
Then in the first step, the second degree of freedom of the core locking device is locked.

[0013] According to an embodiment of the invention, the force applying to the winding core and/or the core locking device is measured and the duration of the locking of the second degree of freedom of the core locking device is kept such that the measured force is smaller than the predetermined force.

[0014] According to another embodiment of the invention, the first carrier roll is controlled such that the roll diameter is defined or measured and the position of the first carrier roll at each point of time is calculated based on this with a predetermined model.

[0015] According to a further embodiment of the invention, the first carrier roll is controlled by calculating the position of the first carrier roll at each point of time with a predetermined model. The model can be defined empirically or caMulatority.

[0016] According to a further embodiment of the invention, the force applying to the winding core and/or the core locking device is measured and the first carrier.roll is controlled such that the measured force is smaller than the predetermined force.

[0017] The method according to the invention is particularly advantageous in acarrier-roll winder in which the carrier rolls have different diameters.

[0018] Prior-art problems are solved in accordance with a further embodiment according to the invention by a method for winding a web reel by a carrier-roll winder which comprises a first and a second carrier roll, the position of which in relation to each other is changeable. In the method, the web is wound around cores radially supported by the first and the second carrier roll or equivalent and in which the acentre part of the reel is supported in the axial direction of the reel to a core locking device by means of a core socket, which core locking device has a first degree of freedom in the direction of the plane of the end of the reel and a second degree of freedom in the direction of the plane of the end of the reel, the riirection of which deviates from the direction of the first degree of freedom. It is characteristic of this embodiment that the winding event comprises a step in which the positions of the first and the second carrier roll are kept unchanged and in which the second degree of freedom of the core locking device is limited such that force smaller than predetermined is applied to the winding core.

[0019] The limitation of the degree of freedom can in practice be damping, braking or total locking of the motion. Also this has an impact on the vibration behaviour of the core locking device advantageously decreasing the vulnerability to the creation of vibration. In practice, this can be implemented such that the motion of the displacement elements of the core locking device is limited e.g. based on the force measurement of its brake device. Force measurement can also be located e.g. in the spindle of the core locking device.

[0020] The limitation of the horizontal degree of freedom occurs according to an 5 embodiment such that the degree of freedom is locked and released periodically such that force smaller than predetermined is applied to the winding core during the locking of the horizontal degree of freedom of the core locking device.

[0021] The objects of the invention are achieved by a web winding apparatus, which comprises a first and a second carrier roll supported by which the web reel is formable, a guide arrangement which is substantially vertical in relation to a plane formed by the rotation axes of the first and the second roll, a core locking device fitted in the guide arrangement which forms for the core locking device its first, vertical degree of freedom, displacement elements of the core locking device which allow the core locking device its second, horizontal degree of freedom. It is characteristic of the winding apparatus according to the invention that the position of the carrier rolls of the winding apparatus in relation to each other is changeable during the run of the winder and that the second degree of freedom of the core locking device is lockable and releasable during the run of the winder.

[0022] According to an embodiment, the displacement elements of the core locking device comprise an arm part rotatably fitted at its one end in the body part of the core locking device, at the other end of which a spindle of the core locking device is fitted.

[0023] According to another embodiment, the displacement 4etements of the core locking device comprise an additional body part fitted with auxiliary guides in the body part of the core locking device, the direction of the linear motion enabled by which auxiliary guides is substantially perpendicular in relation to the direction of motion enabled by the guide arrangement, and in which additional body part the spindle of the core locking device is fitted.

[0024] Other characteristic features of the method and apparatus according to the invention are illustrated in the accompanying claims.

[0025] Advantages achieved by the invention include the following:

- the tendency of the core locking device for vibration during winding has been minimised, - the selectable position of the carrier rolls in relation to each other improves possibilities in affecting the minimising of the vibration of the reels, - the lockable second degree of freedom of the core locking device enabkes a winding process in which the risk of the creation of eoccentricity of the reels cores decreases.

[0026] The invention and its operation will now be described with reference to the accompanying schematic figures in which Fig. 1 shows an arrangement according to prior art, Fig. 2 shows an advantageous embodiment according to the invention, Fig. 3 shows another advantageous embodiment according to the invention, and Fig. 4 shows the course of a winding process according to an embodiment of the invention.

[0027] The carrier-roll winder of Fig. 1 comprises a carrier-roll winder 10 the main parts of which are winder rolls, a front roll 12 and a rear roll 14. The front roll 12 is here an entity formed by two rolls and a belt or a set of belts arranged to rotate around them. From the web being guided on the winder is formed supported by the carrier rolls one or more axially successive reels 16. In the vicinity of both ends of the carrier rolls of the winder, there is a substantially vertical guide 18. In the guide, a core locking device 20 is fitted movable as shown by arrow 22. The core locking device comprises an arm part 28 fitted rotatably as shown by arrow 28 at its one end in the body part 26 of the core locking device, at the other end of which a spindle 30 of the core locking device is fitted. A winding spool, which is typically a core, is supported in winding by means of the spindle 30 in the core locking device 20. In arrangements according to prior art, the motion of the centre of the reel being formed, which in 'Fig. 1 is designated with line L, is not linear and thus the core locking device according to known prior art requires a continuous horizontal degree of freedom i.e. the displacement of the spindle 30 substantially in the horizontal direction.

[0028] In an embodiment of the invention shown in Fig. 2, there is as well the.carrier-roll winder 10 and Fig. 2 uses corresponding reference numbering as in Fig. 1 where there are corresponding elements. In the winder according to the invention, there are also the winder rolls, the front roll 12 and the rear roll 14. The front roll 12 is in this embodiment in fact also an entity formed by two rolls and a belt or a set of belts arranged to rotate around them. 'From the web being guided on the winder is formed supported by the carrier rolls a set of axially successive reels 1,5. In the vicinity of both ends of the carrier rolls of the winder, there is the substantially vertical guide 18 of which this presentation shows only one. In both guides, the core locking device 20 is fitted movable along it as shown by arrow 22 (enables the first degree of freedom).
The purpose of the core locking device is to keep the cores during the whole winding in the same places in the axial direction yet to allow the cores to move almost without resistance in the vertical direction and often also in the machine direction.

[0029] The core locking device comprises the arm part 28 fitted rotatably as shown by arrow 28 at its one end in the body part 26 of the core locking device {enables the second degree of freedom). At the other end of the arm part 28 is fitted the spindle 30 of the core locking device. This operates as the displacement element of the core locking device. The winding core is supported in winding by means of the spindle 30 and a core socket 31 in the core locking device 20.

[0030] The variable-geometric carrier-roll winder of a slitter-winder shown in Fig. 2 additionally comprises in connection with the core locking dev'rce a brake device 32 in the area of a curved path 24 of the arm part which brake device is formed of a brake disc 34 and an actuator affecting it, such as a brake actuator 36, the cylinder (not shown) of which is arranged to compress a separate friction lpad against the surface of the brake disc. Then, the brake can operate e.g. hydraulically or-pneumatically.

[0031] The brake actuator 36 is fitted in the arm part by means of a force measurement part 38. Advantageously, the rotating force applied to the ar-m part is measured when the winder is running.

[0032] The core locking device also comprises a power unit 21 ~coupled between the arm part 28 and the body part 26. The power unit can be e.g. a hydraulic cylinder ot a compressed air cylinder. It can be used for moving the arm part, among others.

[0033] The support of the rear roll 14 of the winder comprises a displacement mechanism 40 of the roll with its power unit, which enables changing the position of the roll during the run of the winder.

[0034] The winder also comprises a control system 100 by which the operation of the winder is controlled. The control system is in a data transfer communication 101 with the displacement mechanism of the rear roll 14 as well as with the core locking device for controlling it and its actuators and for-communicating measuring data in the control system. In the core locking device, there advantageously are at least the above-mentioned force measurement part 38 and also a measuring sensor~not showri) of the angle of the arm part 28.

[0035] The winder shown in Fig. 2 operates. such that, as the winding proceeds, whereby the size of the reel thus increases continuously and its centre is displaced along a.certain path defined by the geometry of the winder, mainly the size of the winding rolls 12, 14 and the position of the rear roll 14. According to the invention, the winding event comprises at least a first step in which the motion of the centre of the reel being formed is substantially guided in the direction of the.first degree of freedom 22 of the core locking device by displacing the rear roll 14, which here illustrates the first carrier roll, in relation to the set of =belt rolls 12, which here illustrates the second carrier roll, during winding. This direction is parallel with the direction of the guide arrangement 18. Thus, the substantially horizontal degree of freedom 28 of tlhe core locking device is lockable. From this is gained the- advantage that the impact of the core locking device on vibrations has been minimised. The locking takes place such that the control system 100 controls the brake actuator 36 to lock the position of the arm part against the surface of the brake disc 34. According to the invention, the locking can be periodical and the time of the brake of being released is still shorter than the time of being locked. When the operation of the winder is controlled this way, it is advantageous to use an elastic joint between the spindle and the core socket of the core locking device.

[0036] The motion of the centre.of the reels is thus controllable to occur substantially linearly along path L' by moving one of the rolls 14 carrying the web reels in a suitable way. The motion of the roll 14 is defined according to an advantageous embodiment of the invention by calculating the position of the roll at each time from the diameter of the reels and the geometry of the machine. This way of control enables the locking of the horizontal degree of freedom in place during winding or its considerable damping by braking.

[0037] The motion of the roll 14 carrying the reel is also implementable by measuring the force caused by braking the horizontal degree of freedom of the core locking device 20. Then, the motion of the roll 14 is controlled for minimising this force or for keeping the force smaller than a predetermined set value. The required motion of the carrier roll in relation to the diameter of the reel can also be defined -empirically.

[0038] The horizontal degree of freedom 24 of the core locking device 20 is brakeable or lockable during winding also such that the brake 34 fitted into connection with the core locking device is controlled on and off based on the braking force measured by the force measurement part 38 such that the force does not increase over a certain limit, whereby there is necessarily/continuously no need to move the -carrier roll 14.
When the horizontal direction of the core locking device is mostly locked, an impact decreasing the vibration of the core locking device is provided at least in some amount.

[0039] Fig. 3 shows an arrangement operationally corresponding 'Fig. 2. The reference numbering of Fig. 3 corresponds the reference numbering of Fig. 2 for the part of corresponding elements and features. In this embodiment, the horizontal degree of freedom is provided instead of the pivoted arm part with a second carriage 28' which is shown with a dashed line. For enabling this, the second carriage -28' is arranged movable on second guides 28" in a corresponding way as in the embodiment of Fig. 2.

[0040] Fig. 4 illustrates, according to an embodiment, the motion of the reel centre in the winding process occurring with a method according to the invention. The structure of the actual winder differs from the embodiments of Figs. 2 and 3 such that the path of the rear roll 14 is at an angle in relation to the horizontal plane. Here the reel forming is controlled to take place first such that, when the reel 16.1 increases, its centre has proceeded in the direction and position shown by line L1 which thus joins the direction of motion of the guide arrangement 18. During this, the horizontal degree of freedom of the core locking device has been locked and the rear roll 14 has moved towards the front roll 12. In point P1 in which the situation of the reel has been illustrated with the reel 16.2, the brake actuator 36 of the core locking device has been released. Then, the rear roll is in position 14.2. The reel centre has moved due to the release of the horizontal degree of freedom a distance in the horizontal direction at the same time as winding along line L2 of the reel centre has occurred, the rear roll being in position 14.2. After position P3 of the reel centre, the rear roll has b.een displaced away from the front roll towards position 14.3, the reel centre moving along line L3 into point P3 which corresponds position 14.3 of the rear roll. After this, winding has been continued in the second position in the direction shown by line L4, the horizontal degree of freedom of the core locking device being locked.

[0041] As is noticeable from the above-described, a simple and easy-to-use apparatus has been developed, which apparatus eliminates a considerable number of prior art disadvantages. It should be noticed, however, that only a few of the most advantageous embodiments of the invention were described above. Thus, it is evident 10 that the invention is not limited to the above-mentioned embodiments, but it can be applied in many ways e.g. by combining the features of different. embodiments within the scope defined by enclosed claims.

Claims

1. A method for winding a web reel by a carrier-roll winder, in which method, the web is wound around cores radially supported by a first and a second carrier roll or equivalent and in which the centre part of the reel is supported in the axial direction of the reel by a core locking device by means of a core socket, which core locking device has a first degree of freedom which lies in the direction of the plane of the end of the reel, wherein the winding event comprises at least a first step in which the motion of the centre of the reel being formed is substantially guided in the direction of the first degree of freedom of the core locking device by displacing the first carrier roll in relation to the second carrier roll during winding, the core locking device has an optionally lockable and releasable second degree of freedom which lies in the direction of the reel surface and deviating from the direction of the first degree of freedom, and in the first step the second degree of freedom of the core locking device is locked.

2. A method according to claim 1, wherein the winding event comprises a second step in which the positions of the first and the second carrier roll are kept unchanged and in which the second degree of freedom of the core locking device is locked and released periodically such that a force smaller than a predetermined force is applied to the winding core and/or the core locking device during the second degree of freedom of the core locking device being locked.

3. A method according to claim 1 or 2, wherein the force applying to the winding core and/or the core locking device is measured and the duration of the locking of the second degree of freedom of the core locking device is kept such that the measured force is smaller than the predetermined force.

4. A method according to claim 1, wherein the first carrier roll is controlled such that the roll diameter is defined or measured and the position of the first carrier roll at each point of time is calculated based on this with a predetermined model.

5. A method according to claim 1, wherein the first carrier roll is controlled by calculating the position of the first carrier roll at each point of time with a predetermined model.

6. A method according to claim 1, wherein the force applying to the winding core and/or the core locking device is measured and the first carrier roll is controlled such that the measured force is smaller than a predetermined force.

7. A method for winding a web reel by a carrier-roll winder which comprises a first and a second carrier roll the position of which in relation to each other is changeable, in which method, the web is wound around cores radially supported by the first and the second carrier roll or equivalent and in which the centre part of the reel is supported in the axial direction of the reel by a core locking device by means of a core socket, which core locking device has a first degree of freedom which lies in the direction of the plane of the end of the reel and a second degree of freedom which lies in the direction of the plane of the end of the reel, the direction of which deviates from the direction of the first degree of freedom, wherein the winding event comprises a step in which positions of the first and the second carrier roll are kept unchanged and in which the second degree of freedom of the core locking device is limited such that a force smaller than a predetermined force is applied to the winding core.

8. A method according to claim 7, wherein the second degree of freedom of the core locking device is locked and released periodically such that the force smaller than the predetermined force is applied to the winding core during the horizontal second degree of freedom of the core locking device being locked.

9. A method according to claim 7, wherein the winding event comprises a step in which the second degree of freedom of the core locking device is locked and the motion of the reel centre is substantially guided in the direction of the first degree of freedom of the core locking device by displacing the first carrier roll in relation to the second carrier roll during winding.

10. A web winding apparatus for carrying out the method of any one of claims 1 to 9, which comprises:
- a first and a second carrier roll, supported by which a web reel is formable, - a guide arrangement which is substantially vertical in relation to the plane formed by the rotation axes of the first and the second roll, - a core locking device fitted in the guide arrangement, the core locking device having a first degree of freedom which lies in the direction of the plane of the end of the reel being formed, - displacement elements of the core locking device which allow the core locking device a second degree of freedom which lies in the direction of the plane of the end of the reel being formed, deviating from the direction of the first degree of freedom, wherein the position of the carrier rolls of the winding apparatus in relation to each other is changeable during the run of the winder, the second degree of freedom of the core locking device is lockable and releasable during the run of the winder, and the displacement elements are provided with a brake device for locking and releasing the second degree of freedom.

11. A web winding apparatus according to claim 10, wherein the displacement elements of the core locking device comprise an arm part rotatably fitted at its one end in the body part of the core locking device and at the other end of which arm a spindle of the core locking device is fitted.

12. A web winding apparatus according to claim 10, wherein the displacement elements of the core locking device comprise an additional body part fitted with auxiliary guides in the body part of the core locking device, the direction of the linear motion enabled by such auxiliary guides is substantially perpendicular in relation to the direction of motion enabled by the guide arrangement, and in which additional body part the spindle of the core locking device is fitted.