U.S. patent application number 10/597852 was filed with the patent office on 2008-10-16 for method in reeling up and a reel-up.
Invention is credited to Matti Kemppainen, Teppo Kojo, Risto Makinen, Ilkka Naatti, Vesa Riihela, Marko Tiilikainen.
Application Number | 20080251628 10/597852 |
Document ID | / |
Family ID | 31725697 |
Filed Date | 2008-10-16 |
United States Patent
Application |
20080251628 |
Kind Code |
A1 |
Kemppainen; Matti ; et
al. |
October 16, 2008 |
Method in Reeling Up and a Reel-Up
Abstract
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').
Inventors: |
Kemppainen; Matti; (Jokela,
FI) ; Riihela; Vesa; (Halkia, FI) ; Kojo;
Teppo; (Mantsala, FI) ; Makinen; Risto;
(Mantsala, FI) ; Naatti; Ilkka; (Helsinki, FI)
; Tiilikainen; Marko; (Kellokoski, FI) |
Correspondence
Address: |
STIENNON & STIENNON
612 W. MAIN ST., SUITE 201, P.O. BOX 1667
MADISON
WI
53701-1667
US
|
Family ID: |
31725697 |
Appl. No.: |
10/597852 |
Filed: |
February 11, 2005 |
PCT Filed: |
February 11, 2005 |
PCT NO: |
PCT/FI05/50030 |
371 Date: |
March 14, 2007 |
Current U.S.
Class: |
242/542.3 |
Current CPC
Class: |
B65H 2301/41468
20130101; B65H 19/2207 20130101; B65H 18/26 20130101; B65H 18/22
20130101 |
Class at
Publication: |
242/542.3 |
International
Class: |
B65H 18/26 20060101
B65H018/26 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 12, 2004 |
FI |
20040217 |
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.
Description
BACKGROUND OF THE INVENTION
[0001] The invention relates to a method in reeling up and a
reel-up.
[0002] 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.
[0003] 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.
[0004] 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.
[0005] 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.
[0006] 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.
[0007] 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.
[0008] 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.
[0009] 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 INVENTION
[0010] The 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.
[0011] In the following, the invention will be described in more
detail with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 shows the main principle of the reel-up in a
schematical side-view as well as a strongly reduced control diagram
of the reeling according to the invention.
[0013] FIGS. 2 to 6 illustrate the different stages of the reeling
up process according to an embodiment of the invention in a side
view of the reel-up.
[0014] FIGS. 7 to 11 illustrate the different stages of the reeling
up process according to a second embodiment of the invention in a
side view of the reel-up.
[0015] FIGS. 12 to 17 illustrate the different stages of the
reeling up process according to a second embodiment of the
invention in a side view of the reel-up.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0016] FIG. 1 illustrates a continuously operating reel-up, where a
paper web W, which is normally several meters wide and comes from a
preceding section of a paper machine or a finishing apparatus for
paper, travels via a reeling nip N1 to a reel R. The reeling nip is
formed by means of a flexible supporting member 1 in the form of an
endless loop, such as a belt or a wire. The supporting member 1 is
guided via two guiding rolls 2 and 3, at the location of each of
which the run of the member 1 turns to the opposite direction. In
the travel direction of the web the first guiding roll 2 can form a
"hard nip" with the reel being started at the initial stage of the
reeling in such a manner that the supporting member 1 is in contact
with the reel at a point where the member travels supported by the
guiding roll 2 on the surface of the roll. The second guiding roll
3 can be a driven roll, i.e. a traction roll, or separate drives
can be arranged for both rolls. The web travels guided by the
supporting member 1 onto the machine reel R, which is formed around
a reel spool 5 rotatable with its own center drive. It is possible
for the reel spool 5 to move in the machine direction with respect
to the loop of the supporting member 1, and this is arranged in
such a manner that the bearing housings at the ends of the reel
spool that enable the rotation of the reel spool are supported on
suitable supporting structures. In connection with the reel-up,
there is also a storage of empty reel spools 5 (not shown), from
which the rolls are brought to the change station at the first
guiding roll 2 in order to change the web going to the machine reel
R that is becoming full. The reel change takes place at production
speed i.e. the paper web passed at high speed to the full reel is
changed to travel onto a new, empty reel spool brought to the
change station.
[0017] 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.
[0018] 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 FIG. 1, the upper web-carrying portion of
the loop of the supporting member 1 is directed diagonally
downwards in its direction of movement, whereas the transfer path
of the reel R and the reel spool 5 is substantially horizontal.
[0019] FIG. 2 illustrates a situation in the primary stage of
reeling up in a situation where the reel spool 5 and the reel R
formed around it during primary reeling is transferred from the
primary reeling device 8 to the transfer device 7, which operates
as a secondary reeling device. For this purpose, the transfer
device 7 is run in the direction pointed out by the arrow against
the travel direction of the web at the location of the primary
reeling device 8. The roll 10 is in the axial direction in contact
with the surface of the reel R within its entire length, thus
forming an auxiliary nip N2. At this stage the web W travels after
the nip N1 formed by the supporting member 1 after the first
guiding roll 2 and the reel R via the surface of the reel R to the
nip N2 and further to the reel R. The nip N1 is formed below the
surface of the reel spool defined by the horizontal diameter of the
reel spool 5.
[0020] FIG. 3 illustrates a situation where the transfer device 7
is transferred forward along the reeling rails 6 in the travel
direction of the web according to the growth of the diameter of the
reel R so that the reel is, at its lower side, always in contact
with the loop of the supporting member 1. The formation of the
bottom of the reel R has already taken place, wherein the effect of
the auxiliary nip N2 formed by the roll 10 and the reel R is no
longer required in the reeling. The reel spool 5 forming the core
of the new reel is brought to the primary reeling device 8. The
roll 10 is lifted up, and the nip N2 is open. In the situation of
FIG. 3 the loop of the supporting member 1 has been transferred
forward in the machine direction in such a manner that the first
guiding roll 2 can be positioned directly below the new reel spool
5.
[0021] FIG. 4 illustrates a situation where the new reel spool 5,
by vertically lowering the primary reeling device 8, has been
brought to the change station in contact with that portion of the
loop of the supporting member 1 that travels on the first guiding
roll 2 in order to form a so-called hard nip. Before this the new
reel spool 5 has been accelerated to the web speed with the drive
of the primary reeling device 8, and the roll has been brought in
contact with the reel spool 5. In comparison to the situation of
FIG. 3, the old machine reel R has moved forward according to the
growth of the reel diameter, i.e. the reeling nip N1 between the
reel R and the loop of the supporting member has moved to the
travel direction of the upper portion of the loop. The reel spool 5
can also be held in its place, and the loop of the supporting
member can be moved in relation thereto, or both movement states
can be combined. Now the paper web W travels between the new empty
reel spool 5 and the first guiding roll 2 of the loop, and further
along the upper web-carrying portion of the loop of the supporting
member 1 and moves over to the periphery of the old reel R in the
reeling nip N1. FIG. 4 further illustrates how in this stage the
old reel R has come into contact with a press roll 9 that is
bearing-mounted rotatable in the frame of the reel-up and rotated
with a drive of its own, the purpose of which is to ensure the
density of the surface layers of the reel. The press roll 9 forms a
nip N3 with the reel R. The press roll 9 can also be positioned
above the horizontal diameter of the reel R that is being formed,
wherein the deflections caused by the gravity of the roll and the
nip force compensate each other. In FIG. 4 broken lines show two
possible locations for the press rolls 9' and 9''. These press
rolls function and move in a similar manner as the press roll 9
presented in the figure and in the present description.
[0022] FIG. 5 illustrates a situation where the web going to the
old reel R has been changed to travel around the new reel spool 5,
i.e. after the nip N1 between the reel spool 5 and the first
guiding roll 2, the web follows the surface of the new reel spool
5, travels further via the nip N2 and starts to form a new machine
reel R around the reel spool. The change methods that are not
described in more detail here may comprise suitable known methods,
for example a cutting blade, water cutting, bag blowing, using tape
in the change and blowings of air, by means of which the web is
brought to tear and to be guided around the new reel spool. The
change is performed in a known manner at full web speed, i.e. at
the production speed of the web.
[0023] FIG. 6 illustrates a situation where the old full machine
reel R is transferred forward with the transfer device 7 to the
removal station away from the contact with the loop of the
supporting member 1 while the press roll 9 moves according to the
transfer movement in such a manner that it is in continuous contact
with the surface of the reel. When a web layer of a certain
thickness has been formed around the new reel spool, the loop of
the supporting member 1 is transferred in a manner pointed out by
the arrow against the travel direction of the web in such a manner
that the first guiding roll 2 moves further away from the new reel,
and the web is guided on a new reel in the point where the surface
of the reel is positioned against the portion of the supporting
member 1 following immediately after the guiding roll 2, i.e. the
situation is the same as in FIG. 2. When the full reel R has been
removed from the reel-up, the transfer device 7 is free to move on
the rails 6 towards the primary reeling device 8 into the position
of FIG. 2, where the reel spool in the primary reeling device 8 and
the reel R that has started to form around it are delivered to the
transfer device 7 for secondary reeling, which, in turn, proceeds
along the loop in accordance with FIGS. 2 to 6.
[0024] FIGS. 7 to 11 show a second embodiment of the invention in
which the reeling process itself corresponds to the stages shown in
FIGS. 2 to 6. In this embodiment the web W is reeled around the
reel spool in the primary reeling in such a manner that the web is
first brought to the nip N2 via the periphery of the roll 10, and
then to the nip N1 and further to the reel R. Thus, the roll 10
functions simultaneously as a guiding roll of the web, and as a
roll tensioning the bottom of the web. After the nip N2 the web is
supported by means of a separate guiding roll 16 of paper, before
it is brought to the nip N1.
[0025] FIG. 7 illustrates a situation at the primary stage of
reeling up in which the reel R formed during the primary reeling is
transferred to the transfer device 7, which thus operates as a
secondary reeling device. During the reeling process the web is
guided via the periphery of the roll 10 to the nip N2 formed by the
roll 10 and the reel R formed around the reel spool, and thereafter
via the paper guiding roll 16 to the nip N1 formed by the reel R
and the supporting member 1 following the first guiding roll 2 and
thus around the reel R that has been formed.
[0026] FIG. 8 shows a situation in which the transfer device is
moved forward in the travel direction of the web as the reeling
proceeds, and the lower side of the reel is in contact with the
loop of the supporting member 1. The roll is transferred upward,
away from the nip contact N1. However, the web moves continuously
supported by the rolls 10 and 16 to the supporting member 1 and
further to the reel R. Thus, at this stage the roll 10 functions as
a paper guiding roll. The reel spool 5 forming the core of the new
reel is brought to the primary reeling device 8. The loop of the
supporting member 1 is transferred in such a manner that the first
guiding roll 2 is positioned directly below the new reel spool.
[0027] FIG. 9 shows a situation in which a new reel spool
accelerated to the web speed is brought in contact with the loop 1
of the supporting member. The old machine reel has moved forward in
accordance with the growth of the diameter of the reel, and the
paper web travels via the periphery of the roll 10 between the roll
10 and the new reel spool via the guiding roll 16, between the new
reel spool and the first guiding roll further along the upper
portion of the loop of the supporting member on the periphery of
the old reel R. The reel R is brought in contact with the press
roll 9. Similarly to the preceding example, the press roll 9' and
9'' can also be positioned above the horizontal diameter of the
reel R that is being formed.
[0028] FIG. 10 shows a situation in which the web passed to the old
reel R is changed to travel around the new reel spool.
[0029] FIG. 11 shows a situation in which the old, full reel spool
R has been transferred forward to a removal position. The press
roll 9 moves as well, being in constant contact with the surface of
the reel. When the web layer of certain thickness has been
accumulated around the new reel spool, the loop 1 of the supporting
member is transferred in a manner indicated by the arrow against
the travel direction of the web in such a manner that the surface
of the new reel is positioned against the surface of the supporting
member 1. One idea of the invention is that both the loading force
caused by the roll, as well as the torque of its drive can be
adjusted. FIG. 1 shows schematically one example of adjusting the
loading force between the roll 10 and the reel R that is being
formed, i.e. the linear load of the roll 10. In the primary reeling
the roll 10 is supported at its ends in the reeling station in a
manner known as such by means of hydraulic cylinders or
corresponding loading members, by means of which the position of
the roll as well as the nip force, i.e. the loading force is
adjusted with respect to the reel spool 5. The ends of the roll 10
are equipped with weighing sensors that measure the nip force
prevailing in the nip N2. The nip force measurement results 12, as
shown in FIG. 1, are transmitted to the control and adjustment unit
11, in which they are processed by means of control algorithms, and
as a result of the processing a nip force control and adjustment
message 13 is attained, which is transmitted to the hydraulic
cylinders supporting the roll 10. The measurement of the nip force
can be a continuous measurement, or it can take place at certain
predetermined intervals. The essential aspect is that the
measurement frequency is such that the adjustment of nip force on
the basis of the measurements can be conducted sufficiently rapidly
in view of the formation of the reel and in a repeated manner. The
increase of nip force during the reeling tightens the bottom of the
reel and the reduction of the same produces a softer reel. FIG. 1
also shows the adjustment of the torque of the drive of the roll
10, in which the driving torque necessary for rotating the roll is
determined calculatorily by means of a frequency variable and
electrical controls, or empirically, and the torque information 14
is transmitted to the control and adjustment unit 11. The driving
torque can be monitored constantly or at fixed intervals. The
control and adjustment unit 11 also contains control algorithms of
the driving torque, by means of which a control message 15 is
attained from the torque information 14 of the driving torque, said
control message being transmitted to the motors driving the roll
10. The torque of the roll together with the web tension affect the
tightness of the reel that is being formed in such a manner that
when they are increased, the tightness of the reel increases as the
reeling proceeds, and when they are reduced, the tightness of the
reel that is being formed is reduced, i.e. the reel becomes
softer.
[0030] 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.
[0031] 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.
[0032] 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 FIGS. 2 to 11 or 7 to 11, i.e. the roll 9 enters in
contact with the reel R immediately after the primary reeling, i.e.
at the stages shown in FIGS. 3 and 8. FIGS. 3 and 8 show the
location of such a roll 9'''. The surface draw can also be attained
in a different manner than that shown hereinabove, wherein two
simultaneous draws are not necessarily required on the surface of
the reel. Thus, the surface draw can be attained between the center
drive of the reel and one member that is in contact with the
surface of the reel R, for example at the primary reeling stage
between the reel spool 5 and the roll 10, at the final reeling
stage between the reel spool 5 and any of the rolls 9, 9', 9'' or 9
. . . or between the supporting member 1 and the reel spool 5.
[0033] FIGS. 12 to 17 show a second embodiment of the invention in
which the roll 10 is in nip contact with the reel R that is being
formed during the entire reeling process. In other words, the roll
10 is in contact with the reel R during both the primary and the
secondary reeling. The roll 10 produces internal holding inside the
surface layers of the reel within the entire width of the web,
wherein the friction between the layers is increased and the reel
can be better held together. This is especially helpful in reeling
of slippery paper grades. Especially when moving the reel from the
primary reeling device 7 to the secondary reeling device 17 by
means of the roll 10 it is ensured that the surface layers of the
machine reel are held together during the deceleration in the
change. Furthermore, the roll 10 can be utilized in the braking of
the finished reel, wherein for example part of the braking torque
can be produced by means of the roll 10. Thus, the roll 10 can even
tighten the surface of the reel during the braking process.
[0034] In the braking process shown in FIGS. 12 to 17, the
supporting member 1 and the guiding rolls 2 and 3 guiding the same
correspond to those presented in the embodiment above. The paper
web W travels via the reeling nip N1 guided by the supporting
member 1 onto the machine reel R, which is formed around a reel
spool 5 rotatable with its own center drive. During the primary
reeling the reel spool 5 is moved in the machine direction in
relation to the loop of the supporting member 1 by means of the
transfer device 7 that supports the bearing housings at the ends of
the reel spool. The transfer device 7 is arranged to move on
substantially horizontal reeling rails 6 extending in the machine
direction. The transfer device 7 also functions as a primary
reeling device for which purpose it is provided with drive devices.
When the diameter of the machine reel R that is being formed grows
in the primary reeling and the reel moves forward, it is in
constant contact with the supporting member 1. When the reel that
is being formed has moved to final end of the reeling rails 6, the
reel spool and the reel R formed thereon are changed to the
secondary reeling device 17 that is arranged at the final end of
the reeling rails 6, in which the formation of the reel into its
final size takes place. The secondary reeling device 17 is
installed in a stationary or movable manner in connection with the
reeling rails, and it has a drive device of its own. In connection
with the reel-up, there is also a storage 18 of empty reel spools 5
(not shown), from where the reel spools are brought to the change
station at the first guiding roll 2 in order to change the web
conveyed to the machine reel R that is becoming full. The reel
change takes place at the production speed. The storage of reel
spools 18 and the reeling rails 6 are positioned horizontally in
such a manner that the transfer device 7 is capable of retrieving
the new reel spool directly from the storage 18. Thus, the reel
spools move substantially on the horizontal plane from the storage
18 all the way to the finished machine reel. The position of the
loop formed by the supporting member 1 is changed during the
reeling process by moving either one or both guiding rolls 2 and/or
3 supporting the loop in such a manner that the reeling nip N1 is
closed during the entire reeling process.
[0035] 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.
[0036] 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).
[0037] FIG. 12 shows a situation in the beginning of the reeling
process in which the reel spool 5 forming the core of the new reel
has been moved from the storage 18 of the reel spools in contact
with the supporting member 1 by means of the transfer device 7. The
loop of the supporting member 1 has been transferred in the
vertical direction in such a manner that the first guiding roll 2
can be positioned directly below the new reel spool 5. Thus, a
so-called hard nip is formed with the guiding roll 2 supporting the
supporting member 1. Before this the new reel spool 5 has been
accelerated to the web speed with the drive of the transfer device
7, and the roll 10 has been brought in contact with the reel spool
5, wherein an auxiliary nip N2 is formed. The cut web W is guided
to travel around a new reel spool 5, between the empty reel spool 5
and the first guiding roll 2 of the supporting member 1, and
further via the nip N2. The roll 10 is also brought in contact with
the reel spool 5, wherein the web also travels via a nip N2 formed
by the same. The finished old reel R is located in the secondary
reeling device 17, and it is still in contact with the supporting
member 1.
[0038] FIG. 13 shows a situation in which some amount of new
machine reel R has been formed around the new reel spool 5. As can
be seen in the figure, as the size of the machine reel increases,
the position of the roll on the travel path 19 has changed when
compared to its position in FIG. 12. The roll 10 is still in nip
contact with the surface of the machine reel R that is being
formed. The loop of the supporting member 1 has been moved in such
a manner that the first guiding roll 2 moves further away from the
new reel and the web is guided on the new reel at such a point
where the surface of the reel is positioned against the portion of
the supporting member that follows the guiding roll 2, and that the
old, full reel machine reel R is no longer in contact with the loop
of the supporting member 1.
[0039] In the situation shown in FIG. 14 the position of the loop
of the supporting member and the location of the reel that is being
formed with respect to the supporting member has remained the same
as in the situation shown in the preceding figure, but the old reel
R has been transferred away from the secondary reeling device
17.
[0040] FIG. 15 shows a situation in which the reel that is being
formed has been transferred forward by means of the transfer device
7 in the machine direction towards the secondary reeling device 17.
The position of the loop of the supporting member has changed when
the size of the reel R has grown in such a manner that the reeling
nip N1 is closed. The position of the roll 10 within the travel
path 19 has also changed and it is still in nip contact with the
surface of the growing machine reel.
[0041] FIG. 16 shows a situation in which the reel spool and the
machine reel R formed thereon is changed from the transfer device 7
functioning as a primary reeling device to the secondary reeling
device 17. The position of the loop of the supporting member 1 and
the location of the roll 10 on the travel path 19 have also
changed. When the machine reel R has been transferred to the
secondary reeling device 17, the transfer device 7 is free to move
along the rails 6 in the machine direction against the storage 18
of reel spools 5.
[0042] FIG. 17 shows a situation in which the reeling of the
machine reel R continues in the secondary reeling device 17. The
roll 10 still forms a nip N2 with the machine reel that is being
formed. The transfer device 7 to which a new empty reel spool 5 has
been transferred is waiting in the storage 18 of reel spools for
the beginning of a new reeling sequence.
[0043] FIGS. 12 to 17 also show a roll 10' equipped with a center
drive whose operating principle is the same as that of the roll 10
and which moves on the same travel path 19 with the roll 10. The
roll 10' also affects the formation of the reel in a similar manner
as the roll 10. The roll 10' also forms a nip N2 with the roll R
and it follows the reel that is being formed from the beginning of
the reeling until the end of the process. FIGS. 12 and 13 show a
roll 10' that is in contact with the surface of the finished
machine reel R. In other words, in FIGS. 14 to 17 the roll 10'
waits for the progress of the reeling of the preceding reel, in
which reeling process the roll 10 takes care of the formation of
the auxiliary nip N2. When the reeling of the new reel begins, the
roll 10' moves in contact with the new reel spool accelerated into
web speed, thus forming an auxiliary nip N2. In the embodiment of
FIGS. 12 to 17 there are thus two rolls that alternately follow the
reel that is being formed during the entire reeling process, and
form an auxiliary nip N2 with the reel that is being formed. Thus,
it is not necessary to change the roll that is in contact with the
reel in the middle of the reeling process. The same roll 10 or 10'
also assists in the braking of the finished reel that is to be
stopped. The roll 10' can be arranged movable in the same
supporting structure with the roll 10, wherein they have a similar
travel path 19, as shown in the figures, or it can be arranged in a
separate supporting structure of its own. It should be noted that
the travel path 19 illustrating the moving of the rolls 10 and 10'
is for the sake of clarity shown in a highly reduced manner in
FIGS. 12 to 17. By means of the supporting structures of the rolls
10 and 10' not shown in the figures it is possible to move the
rolls past each other in the situation of starting a new roll
(FIGS. 16 and 17). For example the rolls 10 and 10' can be
suspended above the reel-up from a beam extending in the machine
direction, and to enable the passing of the rolls the supporting
structures of the rolls 10 and 10' can also have different widths
in the cross direction of the reel-up and the rolls can also be
lifted over each other.
[0044] It is also possible to implement the embodiment of FIGS. 12
to 17 in such a manner that only one roll 10 is used, said roll
following the reel that is being formed only in a part of the
reeling process. Because the reeling takes place as a continuous
reeling process, there are stages in which for example the roll 10
forms an auxiliary nip N2 with the nearly finished reel R, but the
primary reeling of a new reel has already begun. The primary
reeling is thus performed without the roll 10 and the auxiliary nip
N2 formed by means of the same. Similarly, if the roll 10 is
arranged in contact with the reel spool 5 at the primary reeling
stage, the reeling of the simultaneously reeled nearly finished
reel R takes place without the roll 10.
[0045] 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 FIGS. 3
to 5 and 8 to 10 is not necessary, but the supporting member can be
kept in the position shown in FIGS. 6 and 2 and 7 and 11 during the
entire reeling process. It is also possible that at the initial
stage of the reeling the first guiding roll 2 in the travel
direction of the web does not form a "hard nip" with the reel that
is being started, but the reeling takes place all the way from the
beginning by means of the supporting member 1 and the "soft nip" N1
formed by the reel that is being started. Thus, in the beginning of
the reeling, there is one hard nip N2 in use. Also in this
embodiment the supporting member 1 remains stationary during the
entire reeling process.
[0046] 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.
* * * * *