Note: Descriptions are shown in the official language in which they were submitted.
CA 02636423 2008-10-28
WO 2007/088246 PCT/FI2007/050053
1
A reeling shaft of a fibre-web machine reeler
The invention relates to a reeling shaft of a fibre-web machine reeler.
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 machineJboard 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 also the reeling shaft is provided with a drive. In connection with
fibre-
web machines, such as paper and board machines,, are also used unreelers by
means of which a web roll reeled by a reel-up is unreeled in a later stage of
treatment for further processing of the fibre web. After unreeling, the
emptied
reeling shaft is returned for re-use on the reel-up.
.20 In reel-ups, when the machine roll is being completed, a turn-up is made
for
starting the reeling of a new machine roll and for removing a completed
machine
roll from the reel-up. In the turn-up 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 turn-up types include, inter alia, gooseneck, bag
blowing,
strip, water-cutting and side blowing turn-up types. From prior art is also
known a
so-called OptiReel type of tuzn-up, which is described e.g. in patent F191383;
As is known from prior art in connection with the tum-up in reel-ups, for
starting
the reeling of a new web roll, the end of the web is guided into connection
with
the reeling shaft and the end of the web is fastened to the reeling shaft by
means
CA 02636423 2008-10-28
WO 2007/088246 PCT/FI2007/050053
2
of glue, tape or other corresponding adhesive material. After unreeling, when
unloading the bottom of the roll, the adhesive material must also be removed
from
the surface of the reeling shaft in order that it shall not cause problems
when
starting the reeling of the next web roll to be reeled up onto the reeling
shaft.
Removing this adhesive material from the surface of the reeling shaft is many
times difficult and time-consuming manual labour and thus causes additional
costs.
With respect to prior art, reference can also be made to DE published
application
10309049 which describes a process and an assembly for removing a first paper
roll from the reeling assembly and replacing it with an empty reeling shaft
for the
next roll. In this known arrangement, glue is introduced onto the web for
fastening
the end of the web to the reeling shaft. Also in this known arrangement, the
surface of the reeling shaft must be cleaned of possible glue after unreeling
before
a new reeling process.
With respect to prior art, reference is further made to EP patent
specification
0907600 which describes a turn-up device of a reeler in connection with which
is
arranged an apparatus for introducing an adhesive material, such as ,a two-
sided
tape, onto the paper web for fastening the end of the web to the reeling
shaft. The
publication describes different embodiments for malcing the turn-up, but also
in
these embodiments the end of the web is fastened directly to the surface of
the
reeling shaft by an adhesive material, whereby the reeling shaft must be
cleaned
after unreeling before the next new reeling process.
The present invention is directed towards eliminating or at least minimizing
problems and disadvantages of the afore-described arrangements known from
prior art.
The present invention is particularly directed towards eliminating problems
related to the adhesive material remaining on the surface of the reeling shaft
and
to the cleaning measures of the reeling shaft caused by it.
CA 02636423 2008-10-28
3
According to one aspect of the present invention, there is provided a reeling
shaft
of a fibre-web machine reeler which comprises at least one smooth surface area
which comprises at least the area of the surface of the reeling shaft to which
the
adhesive material adheres in connection with the turn-up performed in the
reeling-up process for starting the reeling of a new web roll. The smooth
surface
area is smooth so that the adhesion of the adhesive material used in the turn-
up is
adequate for starting the reeling of a new web roll and that the adhesive
material
is easily removable after unreeling..
According to an advantageous exemplifying embodiment of the invention, the
smooth surface area of the reeling shaft of a fibre-web machine reeler is
formed
on the surface of the reeling shaft in connection with manufacturing so that,
at
least on the area to which the adhesive material fastening the end of the web,
such as tape, adheres, the adhesion of the adhesive material is adequate
especially
in a tangential direction and the adhesive material is easily removable e.g.
in a
radial direction by pulling or "peeling". The smooth surface area
advantageously
extends in the axial direction of the reeling shaft to a circumferential
central area,
but the smooth surface area can also extend in the circumferential and axial
direction of the reeling shaft to a desired area and thus there can be, on the
surface of the reeling shaft, several separate smooth surface areas extending
in
the circumferential andlor axial direction, e.g. on the central and end areas,
or the
smooth area can extend in the circumferential and/or axial direction of the
reeling
shaft substantially over the whole length, e.g. covering the reeling shaft
substantially totally. Thus, there can be several smooth surface areas which
are
separate in the circumferential and/or axial direction of the reeling shaft.
The
smooth surface area of the reeling shaft has been manufactured by turning or
by
grinding or by polishing or by other corresponding treatment depending on the
CA 02636423 2008-07-07
WO 2007/088246 PCT/F12007/050053
4
desired surface-roughness value and on the adhesive material used.
Advantageously, the surface roughness of the smooth surface area, to which the
adhesive material used in the turn-up adheres for fastening the end of the
web, and
which is formed on the surface of the reeling shaft in connection with
manufacture, is Ra = 0.8-3.2 m. The surface roughness of the other surface
areas
of the reeling shaft is typically Ra = 3.2 - 6.3 m.
According to a second advantageous exemplifying embodiment of the invention,
for achieving a smooth surface area of the reeling shaft of a fibre-web
machine
reeler at least on the area to which the adhesive material fastening the end
of the
web adheres, the reeling shaft comprises a protective coating for protecting
the
surface from the adhesive material used in the turn-up. The protective coating
covers at least that area of the surface of the reeling shaft to which the
adhesive
material fastening the end of the web is caused to adhere for starting the
reeling of
a new web roll. According to this embodiment of the invention, the protective
coating of the reeling shaft is advantageously tape, film, paper, board or
other
corresponding material, the bottom of which i.e. the surface coming onto the
reeling shaft is fastenable to the surface of the reeling shaft and the top of
which,
on the other hand, enables the fastening of the end of the web reliably to the
surface of the reeling shaft in connection with the turn-up. According to an
advantageous additional characteristic, the protective coating is detachably
fastened to the surface of the reeling shaft.
In an exemplifying embodiment of the invention using a protective coating,
according to an advantageous additional characteristic, the protective coating
is an
electrically-charged plastic film which fastens by itself by means of an
electric
charge to the surface of the reeling shaft and the upper side of which is
slippery,
whereby the hold of the adhesive material used for fastening the end of the
web in
a tangential direction of the reeling shaft is extremely good, yet, on the
other
hand, the adhesive material is easily cleanable from the surface of the film
after
unreeling and easily replaceable, if required. Such an electrically-charged
plastic
CA 02636423 2008-07-07
WO 2007/088246 PCT/F12007/050053
film applicable for use in connection with the invention is described in EP
patent
specification 0775049 which describes a dielectric film containing gas bubbles
which film is self-adhesive and the adhesion of which is based on a high
unipolar
charge inside the film, which charge is obtained by charging the film under a
5 strong electric field, whereby partial discharges are created in the gas
bubbles and
the charges move into the dielectric material of the film.
In an exemplifying embodiment of the invention using a protective coating,
according to a second advantageous additional characteristic, the protective
coating is glossy-surfaced tape which. adheres well to the surface of the
reeling
shaft and from which the web remaining at the bottom of the roll after
unreeling is
easily detachable and the adhesive material is removed easily along with the
web
material and the tape is easily replaceable, if required.
In an exemplifying embodiment of the invention. using a protective coating,
according to a third advantageous additional characteristic, the protective
coating
is paper or board, which is e.g. glued to the surface of the reeling shaft.
The
protective-coating material being fibre material, e.g. paper glues and
corresponding glues can be used as the adhesive material for fastening the end
of
the web. On the other hand, a special advantage of using a protective coating
which is board or formed of several thin paper layers is that the adhesive
material
is easily removable so that material is removed from the fibre surface when
the
tail of the web with its adhesive material is removed after unreeling.
In an exemplifying embodiment of the invention using a protective coating,
there
is no need to replace the protective coating of the reeling shaft after every
turn-up
but it is easily cleanable and, on the other hand, it is easily replaceable if
its
characteristics have changed so that its characteristic of detachable
fastening to
the reeling shaft or the adhesion of the adhesive material to it is no longer
reliable.
CA 02636423 2008-07-07
WO 2007/088246 PCT/F12007/050053
6
In an exemplifying embodiment of the invention using a protective coating, the
protective coating covers at least that area of the surface of the reeling
shaft to
which the adhesive material fastening the end of the web adheres. The
protective
coating can, however, extend over a desired area in the circumferential and
axial
direction of the reeling shaft, e.g. covering the reeling shaft substantially
totally or
e.g. being formed of several separate areas provided with a protective coating
in
the circumferential and/or axial direction of the reeling shaft.
According to an advantageous exemplifying embodiment of the afore-described
invention in which a protective coating is used and in which the detachable
fastening, of the protective coating is implemented by means of a charge
according
to an advantageous additional characteristic, the invention also encompasses
other
fastening methods which enable reliable adhesion of the protective coating to
the
surface of the reeling shaft and, on the other hand, easy removing of the
protective
coating, if required. The protective coating can be e.g. of shrink-sleeve type
or
butt-jointable. The protective coating can be. removable e.g. by means of
water,
heat or solvents or by mechanical methods or corresponding methods.
According to an advantageous additional characteristic of the invention, a
groove
or a recess is made on the surface of the reeling shaft for the protective
coating,
whereby it is possible to use a thicker protective coating.
The embodiment of the invention in which there are smooth surface areas on the
surface of the reeling shaft in the central area and in the end areas of the
reeling
shaft, is especially well suited for use in connection with a water-cutting
turn-up
process.
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.
CA 02636423 2008-07-07
WO 2007/088246 PCT/F12007/050053
7
Fig. 1 schematically shows a reeling shaft of a reeler according to an
embodiment
of the invention.
Fig. 2 schematically shows a cross-section of a reeling shaft according to
Fig. 1 in
an embodiment in which the reeling shaft comprises a protective coating, at
the
protective coating.
Fig. 3 schematically shows a longitudinal partial section of a reeling shaft
according to an embodiment of the invention.
In the figures and in the description related to them, the same references are
used
of parts corresponding each other if not otherwise stated.
In the embodiment according to Fig. 1, a reeling shaft 10 comprises a smooth
surface area 15 to which, in connection with a turn-up in a reel-up for
starting the
reeling of a new web roll, an adhesive material, used for fastening the tail
of the
web to the reeling shaft, adheres. In the embodiment of the figure, the smooth
surface area 15 extends, in the axial direction of the reeling shaft, over a
substantial partial length to which the adhesive material adheres,
advantageously
to the central area in the axial direction of the reeling shaft, but when
desired the
smooth surface 'area 15 can also extend substantially for the whole axial
direction
of the reeling shaft or there can be several, separate smooth surface areas in
the
axial direction of the reeling shaft. The smooth surface area of the reeling
shaft 10
is, according to one embodiment, formed on the surface of the reeling shaft in
connection with manufacture e.g. by turning or by grinding or by polishing the
area in question to a desired surface-roughness value, advantageously 0.8-3.2
m.
The smooth surface area of the reeling shaft is, according to a second
embodiment, obtained so that the reeling shaft comprises a protective coating
15
adhered to the surface of the reeling shaft 10 for obtaining said smooth
surface
area.
CA 02636423 2008-07-07
WO 2007/088246 PCT/F12007/050053
8
In the embodiment according to Fig. 2, the protective coating 15 surrounds the
reeling shaft 10 in its whole circumferential direction, but the protective
coating
15 can also extend only for a part of the circumference or there. can be
several
separate protective coatings in the circumferential direction.
In the exemplifying embodiment of the invention according to Fig. 3, a groove
is
made in the surface of the reeling shaft 10, in which groove the protective
coating
is positioned. In the example shown in the figure, the groove is made by
removing material forming a surface layer 11 of the reeling shaft 10 at a
point in
10 which the protective coating 15 is positioned.
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.
