Method in Reeling Up and a Reel-Up
The invention relates to a method and an apparatus in reeling up, in which a paper web or the like (W) is reeled around a center-driven reel spool (5), which is transferred from the primary reeling to the secondary reeling, in which reeling the reel spool (5) is transferred in accordance with the growth of the reel by means of a transfer device (7) at least at some stage of the reeling and the web is brought at said stage from below the reel spool (5) via a reeling nip (N1) formed by the reel spool (5) and a loop (1) of an endless supporting member. According to the invention the web (W) is guided around the reel spool (5) during the reeling via an auxiliary nip (N2) formed by means of the reel spool (5) and the roll (10, 10′).
The invention relates to a method in reeling up and a reel-up.
In the final end of a paper machine or a finishing apparatus for paper, a paper web which is typically several meters wide and which has been produced and/or treated in preceding machine sections, is reeled around a reel spool to form a machine reel. In this reeling up process a reeling cylinder that is bearing-mounted rotatable is typically used for guiding the paper web on the machine reel, wherein the nip contact between the reeling cylinder and the machine reel is utilized to influence the quality of the reel produced thereby. In a conventional solution the reeling cylinder remains stationary and the reel spool around which the reel is accumulated in nip contact is moved during reeling up in a supporting structure, for example by supporting the ends of the reel spool on reeling rails. The ends of the reel spool are affected by means of a suitable loading mechanism to adjust the nip contact between the machine reel that is being formed and the reeling cylinder. Such reeling concepts and loading methods related thereto are disclosed, for example, in the Finnish patent 91383 and in the corresponding U.S. Pat. No. 5,251,835, as well as in the Finnish patent application 950274 and in the corresponding U.S. Pat. No. 5,690,298.
Another known solution is the one in which the reeling cylinder is arranged to move on a carriage, and the machine reel is rotated with a center drive in a stationary reeling station, i.e. the location of the center of the reel spool remains the same. When the radius of the machine reel grows, the reeling cylinder shifts in such a manner that the carriage supporting the same moves in the guide. Such an arrangement is disclosed, for example, in the European application publication 792829 and in the corresponding U.S. Pat. No. 5,988,557.
U.S. Pat. No. 5,370,327 discloses a solution in which the reeling cylinder moves in the vertical direction, thus making it possible to maintain the angular position of the nip between the reeling cylinder and the machine reel substantially constant when the reel moves on reeling rails. The low position of the reeling cylinder and the movement of the same in the vertical direction make it possible to transfer the reel spools from a storage to a reeling station along a straight transfer path. The solution contains two pairs of reeling carriages, of which the pair that has delivered the full machine reel can return past the other pair that is guiding the reel to be reeled, to retrieve a new empty reel spool.
According to the Finnish patent application 950274 and the corresponding U.S. Pat. No. 5,690,298 it is possible to use an auxiliary roll located at a lower position and moving in the vertical direction in addition to the stationary reeling cylinder that guides the web on the reel, said auxiliary roll forming a second nip with the machine reel produced in the moving reeling station. Before the change this auxiliary roll is in contact with the reel that is becoming full, which has been run off the reeling cylinder. A corresponding arrangement in connection with a change is disclosed in the Finnish patent 91383/U.S. Pat. No. 5,251,835.
In addition, the publication EP-860391 discloses a reeler, in which the web is guided on a reel via a belt or a wire, which is led via guiding rolls. Thus, by means of the belt or the wire, a long reeling nip having an even pressure is provided on the area of the lower half of the reel. The pressure can be adjusted through the tension of the belt or the wire. The belt or wire loop can be tilted in the vertical plane in such a manner that the first guiding roll in the travel direction of the web can be lifted against the new reel spool, which rests on reeling rails above the belt. When the reel grows it moves forward on the reeling rails in such a manner that it is constantly in contact with the downwards-tilted run of the wire or belt, which follows the guiding roll and via which the web comes on the reel.
Furthermore, the patent U.S. Pat. No. 5,531,396 discloses a reeler, in which the wire loop is guided over the reeling cylinder in such a manner that it guides the web after the reeling cylinder on the reel that is being formed.
In reelers utilizing a wire or a belt, problems are caused by the flaws produced in the reel during the primary reeling. The belt nip is soft, which results in that the bottom of the reel can also become soft. It is difficult to tighten the bottom of the reel in belt reeling only with the belt nip, which may cause for instance internal slip in the reel in the direction of the periphery of the reel and/or in the axial direction.
The nip pressure of the soft belt nip is also smaller, for example only approximately one tenth of the nip pressure produced by the roll nip. Due to the small nip pressure the friction force between the surface layers of the reel that is being formed, i.e. the resistance against mutual transverse slip remains small in the belt nip. It is, of course, possible to increase the nip pressure of the belt nip by increasing the tension of the belt, but this requires both heavy and very expensive wire guiding rolls, devices for moving the belt guiding rolls and frame structures of the reel-up. Furthermore, especially when reeling slippery paper grades, the belt tension must be very high, for example over 20 kN/m to attain sufficient nip pressure.
SUMMARY OF THE INVENTIONThe purpose of the invention is to provide a new reeling up method using a belt and a wire, by means of which the reeling can be better implemented by simultaneously preserving the advantages of known methods.
In the following, the invention will be described in more detail with reference to the appended drawings.
During the primary reeling, at least at some stage, when the reel spool 5 is still located in its place in the primary reeling device 8, an auxiliary nip N2 is formed by means of the roll 10 with the reel spool 5. The roll 10 is positioned in the upper part of the reel spool, more precisely above the surface of the reel spool restricted by the horizontal diameter of the same. Advantageously the roll 10 is arranged in a position sloping upward with respect to the reel spool, in other words horizontally with respect to the diameter, in an angle of 45 to 70 or 135 to 160 degrees, wherein the deflections resulting from the gravity of the roll and the nip load compensate each other. The roll 10 is moved by means of actuators attached to the frame of the primary reeling device. The roll 10 is a roll equipped with a center drive, having a shell which is in the axial direction at least as long as the width of the web to be reeled in its cross direction. Preferably the shells of the roll 10 and the reel spool 5 are equally long in the axial direction. The purpose of the roll 10 is to tighten the bottom of the reel that is being produced evenly on the entire width of the web at the primary reeling stage. Thus, it is possible to prevent internal slip of the reel and the reeling faults resulting therefrom. It is also possible to measure and adjust the loading force of the nip roll. The torque of the drive of the roll can also be adjusted, thus increasing or reducing the tightness of the reel. The roll 10 can be driven either during the entire primary reeling, or it can be driven only for a part of the time of the primary reeling.
The machine reel R can be transferred in the machine direction in a transfer device 7, which supports the bearing housings at the ends of the reel spool and which is moved by means of actuators attached to the frame of the reel-up. The transfer device 7 is arranged to move on substantially horizontal reeling rails 6 extending in the machine direction, and it is formed of a carriage at each end of the reel spool, which supports the bearing housing at the end of the reel spool 5. When the diameter of the machine reel R grows, and the reel moves forward, it is in continuous contact with the supporting member 1 because the transfer path of the transfer device 7 and the web-carrying portion of the supporting member 1 together form an angle opening in the transfer direction. In
The control unit can contain both machine control and control of the electric drives. The electric drives can be adjusted either by means of speed or torque adjustment. The adjustment method is selected depending on the situation, and it can be changed during the operation of the reel-up, especially during threading, or when the reeling proceeds from one nip stage (N1, N2, N3) to another, or from one center drive to another. The control of the electric drives can also be implemented by means of a separate control unit, wherein there is a gateway/link for communication between said separate control unit and the control unit performing the machine controls.
The tension of the web is measured by means of tension measurement. The web tension is adjusted by means of electric drives, either by adjusting the torque of the center drives, or by means of surface draw, within the limits of holding capacity. The holding capacity is affected by the nip load, the tension of the supporting member and the friction coefficients between the web and the members touching the web. The web tension can also be adjusted without the tension measurement. Thus, the adjustment takes place on the basis of the calculation.
According to another idea of the invention the surface of the reel R that is being formed is tightened by means of so-called surface draw. The surface draw can be determined in such a manner that it is the torque difference between the two rotating members that are located successively in the travel direction of the web and are in contact with the web. One alternative is to use the surface draw in the beginning of the reeling, wherein the surface of the reel R is tightened by the torque difference between the supporting member 1 and the roll 10, wherein it is possible to tighten the bottom of the reel. Another alternative is to adjust the tightness or hardness of the reel during the entire reeling process. Thus, in the beginning of the reeling the surface of the reel is tightened in the above-described manner, i.e. by the torque difference between the supporting member 1 and the roll 10, and when the reeling proceeds, the surface of the reel is tightened by means of the torque difference between the supporting member 1 and the roll 9. In this alternative, if the aim is to ensure the adjustment of the tightness of the reel throughout the entire reeling process, the roll 9 is brought against the reel that is being formed at an earlier stage than presented in the embodiments shown in
In the braking process shown in
During the reeling, substantially during the entire reeling process, an auxiliary nip N2 is formed with the reel spool 5 by means of the roll 10. Similarly to the preceding embodiments, the roll 10 is positioned in the upper part of the reel spool 5, more precisely above the surface of the reel spool defined by its horizontal diameter. The roll 10 is in the axial direction within its entire length in contact with the surface of the reel R, thus forming an auxiliary nip N2.
The roll 10 is attached to a supporting structure (not shown in the figures) that is mounted in connection with the reel-up. The supporting structure is formed in such a manner that it is possible to move the roll 10 in the supporting structure in such a manner that the roll 10 remains in nip contact with the reel R that is being formed substantially during the entire reeling process. The figure shows as an example a travel path 19 of the roll 10 having a rectangular cross-section, in which the roll moves along vertical or horizontal lines 20 of the travel path. It is, of course, possible to apply other kinds of travel paths for bringing the roll 10 against the reel spool. For moving the roll, the supporting structure has drive devices of its own (not shown in the figures).
In the situation shown in
It is also possible to implement the embodiment of
The invention is not intended to be limited to the embodiments presented as examples above, but the invention is intended to be applied widely within the scope of the inventive idea as defined in the appended claims. For example the transfer of the supporting member in the machine direction as shown in
The invention can also be applied during the threading of the web. For anyone skilled in the art, it is of course obvious that the method according to the invention can also be applied in a re-reeler or in a calender reeler.
Claims
1-28. (canceled)
29. A method in reeling up, in which a paper web or the like is reeled around a center-driven reel spool and the reel spool is transferred from primary reeling to secondary reeling in which reeling the reel spool is transferred in accordance with the growth of the reel by means of a transfer device at least at some stage of the reeling and the web is brought at said stage from below the reel spool via a reeling nip formed by the reel spool and a loop of an endless supporting member, wherein during the reeling process, at least at some stage, an auxiliary nip is formed by means of the reel spool and a roll, via which auxiliary nip the web is guided around the reel spool.
30. The method according to claim 29, wherein the web is guided around the reel spool during the reeling in the travel direction of the web in such a manner that the web is guided via the loop of the supporting member to the reeling nip and then to the auxiliary nip.
31. The method according to claim 29, wherein the web is guided around the reel spool during the reeling in the travel direction of the web in such a manner that the web is guided via the periphery of the roll to the auxiliary nip and then to the reeling nip.
32. The method according to claim 29, wherein the auxiliary nip is formed during the primary reeling.
33. The method according to claim 32, wherein the auxiliary nip is also formed during the secondary reeling.
34. The method according to the claim 29, wherein the auxiliary nip is formed by means of the roll for the duration of the threading of the web.
35. The method according to the claim 29, wherein the roll is arranged to function as a guiding roll for the web.
36. The method according to the claim 29, wherein the reeling nip is formed below the surface of the reel spool defined by the horizontal diameter of the reel spool.
37. The method according to the claim 29, wherein the auxiliary nip is formed above the surface of the reel spool limited by the horizontal diameter of the reel spool.
38. The method according to claim 32, wherein during the secondary reeling a nip is formed by means of the reel and a press roll.
39. The method according to claim 29, wherein the reel spool is transferred by means of the transfer device during the secondary reeling.
40. The method according to claim 29, wherein the reel spool is transferred by means of the transfer device during the primary reeling.
41. The method according to the claim 29, wherein in the axial direction the shell of the roll is at least as long as the width of the web in its cross direction, preferably the shells of the roll and the reel spool are equally long in the axial direction.
42. The method according to the claim 29, wherein the primary reeling is adjusted by means of the nip force produced by the roll.
43. The method according to claim 42, wherein the nip force produced by the roll is measured and the measurement result is transmitted to a control and adjustment unit in which a nip force control and adjustment message is formed.
44. The method according to the claim 29, wherein the primary reeling is adjusted by means of the torque of the roll.
45. The method according to claim 44, wherein the torque of the roll is measured, and the measurement result is transmitted to the control and adjustment unit in which a torque control message is formed.
46. The method according to the claim 29, wherein the reeling is adjusted by means of the surface draw of the paper web.
47. A reel-up, which comprises means for reeling a paper web or the like around a center-driven reel spool, said means comprising:
- a transfer device for transferring the reel spool in accordance with the growth of the reel from primary reeling to secondary reeling;
- a loop of an endless supporting member; and
- a reeling nip formed by means of the loop of the endless supporting member and the reel spool, wherein the web is arranged to be brought from below the reel spool via the reeling nip while transferring the reel spool by means of the transfer device, wherein the means for reeling comprise a roll which together with the reel spool form an auxiliary nip via which the web is guided around the reel spool.
48. The reel-up according to claim 47, wherein the means for reeling comprise means both for primary and secondary reeling.
49. The reel-up according to claim 47, wherein the roll together with the reel spool forms an auxiliary nip during the primary reeling.
50. The reel-up according to claim 49, wherein the roll together with the reel spool also forms an auxiliary nip during the secondary reeling.
51. The reel-up according to claim 47, wherein in the shell of the roll is in the axial direction at least as long as the width of the web in its cross direction, preferably as long as the length of the shell of the reel spool in the axial direction.
52. The reel-up according to claim 49, wherein the means for reeling comprise a press roll, which, together with the reel forms a nip during the secondary reeling.
53. The reel-up according to the claim 47, wherein the transfer device is arranged to move the reel spool during the secondary reeling.
54. The reel-up according to the claim 47, wherein the transfer device is arranged to move the reel spool during the primary reeling.
55. The reel-up according to claim 47, wherein the reel-up is provided with a control and adjustment unit to adjust the reeling.
56. The reel-up according to claim 47, wherein the auxiliary nip is arranged to be formed for the duration of the threading of the web.
Type: Application
Filed: Feb 11, 2005
Publication Date: Oct 16, 2008
Inventors: Matti Kemppainen (Jokela), Vesa Riihela (Halkia), Teppo Kojo (Mantsala), Risto Makinen (Mantsala), Ilkka Naatti (Helsinki), Marko Tiilikainen (Kellokoski)
Application Number: 10/597,852
International Classification: B65H 18/26 (20060101);