Note: Descriptions are shown in the official language in which they were submitted.
CA 02636430 2010-10-15
Method in connection with a reel-up of a fibre-web machine
The invention relates to a method in connection with a change process of a
reel-up of
a fibre-web machine.
From prior art are known reel-ups used in connection with fibre-web machines,
such
as paper and board machines, a fibre web being manufactured by which fibre-web
machines, such as a paper machine/board machine, is reeled as a full- width
web into
machine rolls for further processing. The web is reeled around a reeling shaft
e.g. a
reel spool/roll either by means of surface draw in a reeling nip between a
reel drum
and a web roll being formed or by utilising a centre drive, whereby the
reeling shaft is
also provided with a drive. In reel-ups, when the machine roll is being
completed, a
change is performed for starting the reeling of a new machine roll and for
removing a
completed machine roll from the reel-up. In the change process the web is cut,
whereby one end of the web goes into connection with the completed machine
roll
and the other end is guided around the reeling shaft for starting the reeling
of a new
machine roll. The so-called traditional change types include, inter alia,
gooseneck,
bag blowing, strip, water-cutting and side blowing change types. From prior
art is also
known a so-called OptiReelTM change type which is described e.g. in patent
FI91383.
A problem in connection with the change process of reel-ups known from prior
art has
been the occurrence of separated web pieces and their being carried into the
reeling
nip and inside the new machine roll being formed, which one has tried to
prevent e.g.
by means of blowings, but this has not been able to eliminate the problem
because it
has not been possible to satisfactorily guide the cut web into the nip by
means of
blowings, because of which separated web pieces remain floating in the air
space
above the nip and, in addition, separated web pieces also come out of the
completed
roll as smaller pieces. The loose web pieces carried
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
2
inside the roll weaken the quality of the roll, cause production losses and
are thus
particularly problematic.
Furthermore, problems are caused by "flying pieces" i.e. pieces of fibre web
i.e.
surface broke separates from the tail of the machine roll i.e. end of the web
on the
surface of the roll when the tail hits against the pressing device when
braking the
machine roll after the change. This problem becomes particularly
disadvantageous
if pieces of fibre web fly with air flows caused by the surface of the machine
roll
into the machine roll being at the start of a new reeling. The pieces of fibre
web
inside the machine roll cause a break risk in the later handling of the roll
and can
in connection with calendering even damage the rolls of the calender when
enter-
ing into the calendering nip between the rolls of the calender.
The afore-described occurrence of web pieces in connection with reeling is
many
times thus called in the art the creation of surface broke and the separated
web
pieces being produced are called surface broke. Primary surface broke means
such
web shreds/loose web pieces as are created in the primary drive in connection
with the change cutting or after that mostly caused by change blowings etc.
Sec-
ondary surface broke means web shreds which fly into the air in the secondary
drive after the change from the surface of a still rotating completed roll
caused
e.g. by the flapping of the web tail or by the breaking of its surface. Some
objects
of the present invention are related to solving problems mostly caused by
secon-
dary surface broke.
A problem in connection with the change process in a reel-up has been that
after
the change the surface layers of a completed machine roll loosen when braking
the
machine roll and after stopping when removing a pressing device from its
position
against the roll. The loosening of surface layers causes surface broke and the
situation is at its worst in connection with fast, speed over 1,500 m/s m/min,
on-
line machines especially when reeling slippery fibre-web types, such as LWC
and
CWF, whereby even over 1,000 metres of surface broke can be created.
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
3
In traditional continuous reel-ups known from prior art, there has usually
been no
need to bind the surface of the machine roll to the surface of the roll
immediately
after the change of the machine roll, especially if the running speed has been
low
and the material being reeled has been permeable to air and has had a high
friction
coefficient between the fibre-web layers. If a charge is created in the web
being
reeled before the reeling process as a result of static electricity, the hold
between
the layers improves and the surface layers of the roll remain attached to the
com-
pleted machine roll. The charge phenomenon occurs especially when reeling a
dry
fibre web. A charge can also be created by design by means of a separate
appara-
tus for binding surface layers in the completed roll. A problem in situations
in
which the surface layers of the web roll are held fast in the completed roll
by
means of a high charge is that the high charge can impede working, e.g.
sampling
close to the machine, because charges can discharge from the roll via the
operat-
ing personnel into the machine frame or the building in an unpleasant or
danger-
ous manner.
A method is also known from prior art for holding the surface layers fast in
the
completed machine roll by means of a pressing device, such as a brush or a
roll,
by which brush or roll the surface of the machine roll is pressed during the
chang-
ing and stopping of the machine roll, whereby a nip formed between the com-
pleted machine roll and the brush or the roll prevents air from entering into
the
machine roll and keeps the surface layers of the machine roll in place. A
disadvan-
tage of these known arrangements is the cost accrued by the pressing device
e.g. a
brush or a roll, the marking of the web and the space requirements of the
devices.
When using high running speeds, the tail of the web further hits the pressing
de-
vice on every revolution, whereby small pieces are torn off from the tail of
the
web which cause afore-described problems and more cleaning requirements and
thus more stays of the operator in the area of the reel-up during running,
which
causes a safety risk. Additionally, cleaning requirement increases the
requirement
for the use of compressed air.
CA 02636430 2008-10-28
WO 2007/088248 PCT/FI20071050055
4
Arrangements are also known from prior art which have been applied in connec-
tion with the manufacture of e.g. coated fibre-web types and in which, for
holding
the surface layers of the completed machine roll fast, problem-solutions based
on
the effect of water have been developed for improving the hold between the sur-
face layers. In these known arrangements, water is sprayed between the surface
layers by means of feed pipes or the like. Such arrangements have, however,
proved problematic, because water does not bind the surface layers tightly
enough, whereby the surface layers of the roll have become loose.
Also arrangements are known from prior art based on the effect of different
sur-
face binding materials, such as glue, for improving the hold between the
surface
layers. In arrangements known from prior art, a case-specifically suitable
amount
of surface binding material is sprayed on the material being reeled in such a
posi-
tion in relation to the roll being completed and the reeling nip that the
surface
binding material has time to act i.e. there is a delay after spraying the
surface
binding material before the pressing caused by the nip, whereby a hold between
the layers is obtained. In arrangements known from prior art, in such cases, a
feed
pipe/pipes of the surface binding material is/are used as the apparatus, in
which
pipe/pipes there are one or more nozzles according to the position of the
appara-
tus. A problem of these arrangements known from prior art has proved to be
that
the surface binding material can accumulate and dry up in the nozzles of the
feed
pipe causing their clogging.
The present invention is directed towards eliminizing or at least minimizing
problems and disadvantages of the afore-described arrangements known from
prior art.
The present invention is further directed towards the provision of a method in
connection with a reel-up of a fibre-web machine, in which method the surface
layers of a completed machine roll will not be able to become loosened during
braking and stopping.
CA 02636430 2008-07-07
Printed: 1:8/12/2007' DESCPAMD F120070500551
4A
Document WO 2004/046006 shows a rewinding machine comprising three winding
rolls to wind a web material and form logs and afirst glue dispenser to apply
glue to
a portion of the web material, in proximity to a severing line, along which
the web is
severed upon termination of winding a log. The first glue dispenser comprises
a
mechanical element that touches the web material upon termination of winding
each
log to transfer the glue to the web material. The tail of the web is fastened
with said
glue to the outer surface of the log. The possibility of using double-sided
tape instead
of glue to fasten the tail of the web to the outer surface of the log is also
mentioned in
this document. This document does not, however, contain any further details of
how
the two-side tape could be applied to the web material. This document forms
the
closest prior art to our invention.
? AMENDED SHEET .04/09/2007
CA 02636430 2010-10-15
An object of the invention is to provide a method in connection with a reel -
up of a
fibre-web machine in which, during the change process, no floating separated
web
pieces occur in a detrimental amount and in which especially problems caused
by
secondary surface broke will be eliminated or at least minimised.
5
To achieve the above-mentioned objects and those which come out later, the
method
according to the invention is mainly characterised by what is presented in the
characterising part of claim 1.
The method according to the invention is applied in a reel-up of a fibre-web
machine
in a change of reeling of a full-width web from a first web roll being
completed on a
first reeling shaft to a new, second web roll for reeling the second web roll
around a
second reeling shaft. The method comprises the step of fastening a tail of the
web to
an outer surface web layer of the first web roll and the further steps of:
- adhering a first side of at least one two-sided tape to an outer surface of
a roll,
- passing the at least one two-sided tape with the outer surface of the roll
to a first
contact point formed between the roll and the web,
- adhering a second side, opposite to the first side of the at least one two-
sided tape to
the web in the first contact point, whereby the first side of the at least one
two-sided
tape detaches from the surface of the roll in the first contact point and the
at least one
two-sided tape continues to travel with the web,
- said first contact point being, in a first alternative, on the path of the
web passing to
the first web roll, whereas the at least one two sided tape passes with a
first surface of
the web to a second contact point where the first surface of the web comes
into
contact with the outer surface web layer of the first roll, whereby the first
side of the
two-sided tape adheres to the outer surface web layer of the first web roll in
the
second contact point fastening the tail of the web to the outer surface web
layer of the
first web roll, or
- said first contact point being, in a second alternative, on the outer
surface of the first
web roll, whereas the at least one two-sided tape passes with the outer
surface web
layer of the first roll to the second contact point where the first surface of
the web
being passed to the first web roll comes into contact with the outer surface
web layer
of the first roll, whereby the first side of the two-sided tape adheres to the
first side of
CA 02636430 2010-10-15
6
the web being passed to the first web roll in the second contact point
fastening the tail
of the web to the outer surface web layer of the first web roll.
According to advantageous embodiments of the invention, the tape/tapes is/are
fastened before the change to the surface of the second reeling shaft i.e.
roll spool or
to a separate tape applicator roll positioned before the reel drum or the
first web roll,
or to a pressing roll arranged in connection with the reel drum or the first
web roll,
from which the tape/tapes is/are adhered to the web being passed to the first
web roll
being completed or to the surface of the first web roll being completed by
means of a
nip or by means of the tightening of the web. The tape/tapes is/are detached
from the
surface of the reeling shaft or the like and adheres in a second contact point
to the tail
of the web or to the surface of the first web roll. One adhesive surface of
the two-
sided tape/tapes adheres to the surface of the first web roll or to the web
being reeled
onto the first web roll and fastens thus the surface layer/surface layers of
the first web
roll in a second contact point to prevent their loosening and/or for fastens
the tail of
the web to the first web roll during braking and stopping of the first web
roll.
In connection with the invention, the tape/tapes can be fastened before the
change to
the surface of the reeling shaft either manually or by using a taping device.
One can
also grip the tape with a gripping device from its ends and transfer the tape
above the
web and drop it on the web, whereby the tape is carried along with the web and
sticks
to the web and the machine roll in the reeling nip. Furthermore according to
an
embodiment, when using tag-like tapes the tapes can be guided by means of
compressed air blows onto the surface of the web.
The tape/tapes is/are positioned on the surface of the reeling shaft
longitudinally,
crosswise or spirally. The tape/tapes can be located in one or more points of
the web
in its width and length direction.
In connection with the tape, there can also be a releasable protective surface
layer by
release of which, e.g. by means of blowing, the tape can be timed to adhere to
a
desired point in the tail of the web. For example, when performing a water-
cutting
change in which the web is cut from the middle to the edges so that tails
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
7
reminding dress-coat tails remain in the web on both cross-directional edges
of the
web, the release can be timed so that the tapes will be placed on the tails.
Using a
tape provided with protection, the protection is most advantageously connected
to
the tape so that the protection turns away from the tape because of adhesive
but
does not separate from it completely but is guided to the' machine roll, in
order for
the protection not to fly loosely.
The adhesion to the web of the tape used in connection with the invention must
be
greater than its adhesion to the surface of the reeling shaft. This can be
imple-
mented by the choice of an adhesive material or by making the surface of the
reel-
ing shaft such that the adhesion of the tape to the surface of the reeling
shaft is
smaller than the adhesion of the tape to the web e.g. so that a shiny tape is
fas-
tened to the surface of the reeling shaft or a suitable material, such as
plastic or
teflon, is used as the coating material of the reeling shaft. The surface of
the reel-
ing shaft can also be made suitable in respect of its adhesion by grinding or
by
polishing or by other corresponding treatment decreasing adhesion force.
The two-sided tape used in connection with the invention can also be such that
the
adhesion on the side fastening to the surface of the reeling shaft is smaller
than on
the side first adhering to the web but so that the surface on the side of the
reeling
shaft has adequate adhesion for adhesion to the surface of the machine roll.
The
tape is fastened to the surface of the reeling shaft detachably and to the web
and to
the machine roll permanently. The adhesion of the tape must however be
adequate
in order for the tape not to detach from the surface of the reeling shaft
before its
fastening to the web e.g. because of air flows created when the reeling shaft
ro-
tates. The adhesion force of the tape (peeling adhesion 180 Tesa test method
jopma 002) is advantageously greater than 0 N/cm2 but smaller than 2 N/cm2,
most suitably 0.5-1.5 N/cm2.
According to an advantageous embodiment of the invention, in applying the two-
sided tape, the reeling shaft is brought into contact with the web by closing
the
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
8
primary nip before the change, whereby the tape/tapes on the surface of the
reel-
ing shaft comes/come into contact with the web and, because the adhesion to
the
web is greater than to the surface of the reeling shaft, the tape is fastened,
when
coming out of the nip, to the web and detached from the reeling shaft. The two-
sided tape goes with the web into the machine roll and binds the surface of
the
machine roll when passing through the nip of the reel drum or the pressing
roll
below the first surface layer of the machine roll. The fastening can also
occur
without the nip solely due to the effect of the tightness of the web.
According to an advantageous additional characteristic of the invention,
timing is
used in connection with applying the tape, whereby e.g. by delaying the change
moment it is possible to control the amount of web coming to the surface of
the
machine roll on the tape/tapes.
According to an advantageous additional characteristic of the invention, the
tape
is repulpable, whereby it is possible to use the surface layers of the machine
roll
as broke. Such a tape is e.g. a splicing tape, known as such, used on
unwinders.
E.g. packing tape is suitable for a possible tape to be positioned on the
surface of
the reeling shaft.
According to an embodiment of the invention, one or more separate applications
are made i.e. in the completion stage of the roll the tapes are applied in
respect of
time in different stages, whereby it is possible to bind the surface of the
roll and to
leave layers required for sampling below the surface and a completed binding
below them for further storage or whereby it is possible to bind the full-
width tail
of the web and after this the dress-coat tails formed in the water cutting.
When performing the fastening of the surface layers of the machine roll to the
machine roll according to the invention, an advantage is achieved, inter alia,
that
the two-sided tape binds the surface layers durably, whereby the surface
layers of
the machine roll cannot become loosened during the braking of the completed
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
9
machine roll or after it, whereby surface broke decreases and that the tail of
the
machine roll remains by means of the tape fastened to the surface of the
machine
roll, whereby the tail will not separate from the surface during braking and
thus
will not be able to hit a possible pressing device, whereby there occurs no
prob-
lem with "flying pieces" or it is at least minimised.
When fastening the tail of the web to the surface of the machine roll with the
tape
according to the invention, surface layers are effectively held fast to the
surface of
the machine roll, whereby it is even possible to implement the braking of the
completed machine roll without a pressing device, whereby considerable cost-
saving is achieved.
When applying the invention in connection with a water-cutting change per-
formed in reel-ups, according to advantageous additional characteristics, the
tapes
are fastened so that one tape takes care of the fastening of the tail of the
web to the
completed machine roll, tapes are further advantageously added to fasten the
so-
called dress-coat tails created in the water cutting to the surface of a
completed
machine roll. Then after closing the nip, the first tape passes with the web
to the
machine roll and additional tapes arranged by timing are detached from the
reel-
ing shaft and adhere to the dress-coat tails thus fastening them to the
surface of
the machine roll.
When applying the invention in connection with a gooseneck change performed in
reel-ups, according to advantageous additional characteristics, the tape/tapes
is/are
positioned on the surface of the reeling shaft spirally as spirals extending
from the
middle to the edge. The cutting of the web is performed by a knife or by a
corre-
sponding cutting means which hits the tip of the spiral at a point from which
the
spiral extending from the tip towards the edges controls the slashing of the
goose-
neck into a wedge. Then, the spiral-like tape goes with the web to the surface
of
the machine roll and binds the end i.e. tail of the web and functions thus as
a
means binding the surface layers of the machine roll thus decreasing the
creation
CA 02636430 2008-07-07
WO 2007/088248 PCT/F12007/050055
of secondary surface broke and the unreeling of the machine roll. If required,
to
the middle can be arranged an additional tape by means of which the head of
the
end of the web is lifted. The tape can also be a two-part tape which divides
from
the middle, whereby one part picks up the head and the other is separated with
the
5 tail and guided into the machine roll binding the surface layers of the
roll.
The invention can also be applied to a change performed by change-blowing
pipes
placed below or by a full-width high-speed knife in a reel-up e.g. of OptiReel
type
in which before the change process the roll is pulled out of contact with the
reel
10 drum. In that case, the tape/tapes adheres/adhere to the web by means of
the tight-
ness of the web or by means of a pressing-device nip.
The invention will now be described in more detail with reference to the
figures of
the accompanying drawing, to the details of which the invention is, however,
by
no means intended to be narrowly confined.
Fig. 1 schematically shows a change arrangement of a machine roll according to
an embodiment of the invention.
Fig. 2 shows an embodiment of the invention in which the tape is positioned in
the
longitudinal direction of the reeling shaft.
Fig. 3 schematically shows an embodiment of the invention in which the tapes
are
positioned in the cross-direction of the reeling shaft.
Figs. 4A--4B schematically show applying the invention in connection with a wa-
ter-cutting change.
Figs. 5A-5B schematically show applying the invention in connection with a
change made by a cutting blade.
CA 02636430 2010-10-15
11
Fig. 6 schematically shows applying the invention in connection with a nip
open
change.
Fig. 7 schematically shows applying the invention in connection with a
gooseneck
change.
Fig. 8 schematically shows some embodiments of the invention.
Fig. 9 schematically shows a further embodiment of the invention.
In the figures and the description related to them, the same references are
used of
parts corresponding each other if not otherwise stated.
In the arrangement according to Fig. 1, there is a first web roll 11 i.e. a
machine roll
11 being completed around a first reeling shaft 10. A reel drum is designated
with
reference number 13 and, for manufacturing the next, second web roll for
changing
the reeling into a new roll, a new, second reeling shaft 12 is transferred to
a stand-by
position into connection with the reel drum 13. Arrows Si and S2 show the
direction
of rotation of the machine roll 11 being completed and the direction of
rotation of the
reel drum 13 and arrow SW shows the travel direction of the web W. A two-sided
tape/two-sided tapes 20 is/are fastened to the surface of the second reeling
shaft 12
brought to the stand-by position before its transfer to the stand-by position.
The
tape/tapes 20 is/are fastened before the change to the surface of the second
reeling
shaft 12 manually or by using a taping device. From the surface of the second
reeling
shaft 12, the tape/tapes adheres/adhere in a second contact point to the
surface of the
tail of the web W being guided onto the machine roll 11 being completed and,
in a
second contact point the reeling nip between the reel drum 13 and the machine
roll 11
being completed, the other side of the tape/tapes adheres to the surface of
the machine
roll 11, whereby the surface layers of the machine roll 11 become bound and
they are
not able to become loosened when, after the cutting of the web W, the
completed
machine roll 11 is braked and stopped for transferring it for further
processing.
According to an advantageous additional characteristic of the invention, on
the
surface of the second reeling shaft 12 there can also be a tape/tapes which
CA 02636430 2010-10-15
12
adheres/adhere to the web W timed so that it/they is/are positioned on the
part of the
web W being guided into connection with the second reeling shaft 12.
Fig. 2 shows an embodiment of the invention in which the tape 20 is positioned
in the
longitudinal direction on the surface of the second reeling shaft 12. The tape
20 is
two-sided and of its adhesion such that its adhesion to the second reeling
shaft 12 is
smaller than to the web. In the embodiment shown in Fig. 2, a bottom tape 21
is used
on the surface of the second reeling shaft 12, under the tape 20 by means of
which
bottom tape the adhesion of the tape 20 is arranged to be smaller on the side
of the
second reeling shaft 12 than on the side of the web W.
Fig. 3 schematically shows an embodiment of the invention in which the tapes
20 are
positioned in the cross-direction on the second reeling shaft 12. Also in the
embodiment of this figure, under the tapes 20 there is the bottom tape 21.
Figs. 4A- 4B schematically show applying the invention in connection with a
water-
cutting change, in which the tapes 20 are fastened so that one tape 20A takes
care of
the fastening of the tail of the web W to the completed machine roll, one tape
20B
picks up the head of the web W and fastens it to the second reeling shaft and
tapes
20C are further advantageously added to fasten the so-called dress-coat tails
F created
in the water cutting to the surface of the completed machine roll. Then after
closing
the nip, the first tape 20A passes with the web W to the machine roll and,
e.g. by
blowing, the head of the web W having the second tape 20B is guided into
connection
with the second reeling shaft 12 and likewise the protections of the tapes 20C
are
opened by blowing in a timed manner, whereby the tapes 20C adhere to the dress-
coat
tails F thus fastening them to the surface of the machine roll.
Figs. 5A-5B schematically show applying the invention in connection with a
change
made by a cutting blade. In Figs. 5A-5B, a cutting line C is marked by a
dashed line
on the web W, which line is made by a cutting blade in a known manner for
cutting
the web W. The two-sided tape/two-sided tapes 20 is/are fastened according to
the
invention to the tail of the web W being guided onto the completed machine
roll,
which tape/tapes fastens/fasten the tail of the web W to the surface of the
completed
machine roll thus fastening the surface layers of the machine roll. In Fig.
5A, two
CA 02636430 2010-10-15
13
tapes are fastened to the tail of the web W in the edge areas of the web W
and, in Fig.
5B, one tape 20 extending over the substantial cross-directional width of the
web W is
fastened to the tail of the web W.
Fig. 6 schematically shows applying the invention in connection with a nip
open
change in which the first web roll 11 i.e. the machine roll 11 is being
completed
around the first reeling shaft 10. The reel drum is designated with reference
number
13 and, for manufacturing the next web roll for changing the reeling into a
new roll,
the new, second reeling shaft 12 is transferred to a stand-by position into
connection
with the reel drum 13. Arrows S I and S2 show the direction of rotation of the
machine roll 11 being completed and the direction of rotation of the reel drum
13 and
arrow SW shows the travel direction of the web W. In connection with the
machine
roll 11 being completed, there is a second pressing roll 14 for pressing the
surface
layers during braking and stopping. According to an advantageous embodiment of
the
invention, the two-sided tape/two-sided tapes 20 is/are fastened to the
surface of the
second reeling shaft 12 brought to the stand-by position before its transfer
to the
stand-by position. From the surface of the second reeling shaft 12, the
tape/tapes ad-
heres/adhere to the tail of the web W being guided onto a machine roll 11
being
completed and, due to the effect of the nip of the second pressing roll 14,
the other
side of the tape/tapes adheres to the surface of the machine roll 11, whereby
the
surface layers of the machine roll 11 become bound and they are not able to
become
loosened when, after the cutting of the web W, the completed machine roll 11
is
braked and stopped for transferring it for further processing. When applying
the
arrangement according to the invention, the use of the second pressing roll 14
can be
omitted, whereby the tape 20 makes the web W adhere to the surface of the
machine
roll 11 due to the effect of prevailing web tightness T. On the other hand
according to
an embodiment of the invention, the tape 20 can be adhered to the machine roll
by
means of the second pressing roll 14 as is marked in the figure for an
alternative
applying embodiment D of the tape. In this embodiment, the tape/tapes 20
is/are
fastened to the second pressing roll 14 in a manner corresponding to that
described
above in connection with the second reeling shaft 12, the second pressing roll
14
being in the stand-by position before its transfer to a surface-binding
position in
which it forms a first nip with the machine roll 11.
CA 02636430 2010-10-15
14
Fig. 7 schematically shows applying the invention in connection with a
gooseneck
change in which the tape/tapes 20 are positioned on the surface of the second
reeling
shaft 12 spirally as spirals extending from the middle to the edge. The
cutting of the
web is performed by a knife 25 or a corresponding cutting means which hits the
tip of
the spiral at a point from which the spiral extending from the tip towards the
edges
controls the ripping of the gooseneck into a wedge. Then, the spiral-like tape
goes
with the web onto the surface of the machine roll and binds the end i.e. tail
of the web
and functions thus as a means binding the surface layers of the machine roll
thus
decreasing the creation of secondary surface broke and the loosening of the
surface
layers of the machine roll. If required, to the middle can be arranged an
additional
tape 22 by means of which the head of the end of the web is lifted. The tape
can also
be a two-part tape which divides from the middle, whereby one part picks up
the head
and the other is separated with the tail and guided into the machine roll,
binding the
surface layers of the roll.
According to alternative embodiments A, B, C shown in Fig. 8, the tape/tapes
20 can
also be fastened in manners corresponding to the afore-described embodiments
to a
separate tape applicator roll 19B positioned before the reel dram 13/machine
roll 11,
e.g. to a segmented roll 19B positioned on the same side of the web W as the
reel
drum 13 or the reeling shaft 12, or to a first pressing roll 19A positioned on
the reel
drum 13 from the surface of which the tape/tapes 20 is/are caused to adhere to
the tail
of the web W being guided onto the machine roll 11. These embodiments are
advantageous especially in situations in which the nip between the new reeling
shaft
12 and the reel drum 13 is open.
According to an embodiment shown in Fig. 9, the tape 20 can be transferred
between
the web W and the surface of the machine roll 11 by means of a reeling nip,
whereby
the tape is transferred into the vicinity of the nip e.g. by a binding device
(not shown
in the figures) arranged into connection with the reel-up, is dropped on the
web, arrow
S20, whereby the tape 20 is guided with the web W into the reeling nip e.g. by
means
of blowings and adheres to the web and to the machine roll in the reeling nip.
The invention has been described above mostly related to reel-ups in which the
reeling nip is formed between the reel drum and the roll being formed. The
method
CA 02636430 2010-10-15
according to the invention is also applicable in reel-ups in which e.g. a
support fabric,
e.g. a belt, passes over the reel drum through the reeling nip, between the
reel drum
and the roll being formed, which is described e.g. in H patent 94231. The
invention is
also applicable in reel-ups in which the reeling nip is formed between a
support
5 fabric, e.g. a belt, and the roll being formed, which is described.
The invention has been described above only referring to some of its
advantageous
embodiments, to the details of which the invention is, however, by no means
intended
to be narrowly confined.
