FI119633B - Method and arrangement in a wheelchair for a fiber web - Google Patents

Description

The invention relates to a method according to the preamble of claim 1 in a fiber web winder.

The invention also relates to a device according to the preamble of claim 5 in a fiber web winder.

10

The present invention relates to a method and apparatus for winding a fibrous web, such as paper or board, into a machine roll, i.e. a roll corresponding to the full width of the web. Machine rolls are generally 2.0 to 10.0 m wide and 2.0 to 4.5 m in diameter, depending of course on the size of the paper or board machine.

15

As is known in the art, machine reels of a paper or board web are generally located at the end of a paper or board web production line and are used to wind the finished fiber web into a machine reel around a reel axis. This is often followed by on-line or off-line finishing equipment, through which the paper or board web is produced to the customer's rolls as required by the customer. For winding by machine winders, a winding cylinder, usually nip contacted with the winding shaft and the web roll formed around it, is usually used. One problem with fibrous web machine winders is that, when winding low air permeable fibrous web types at high speeds, air is transported from the nip between the web roll formed in the machine roll and the winding cylinder. The air inside the roll, in turn, reduces friction between the web layers in the roll, which can cause various roll problems such as roll fall, telescoping, edge offset, flagging, wrinkling, etc. With low air permeable fibrous web type 11a, through the roll ends, which is problematic because the nip pressure profile is generally smiling due to the deflection of the rolls and the loading of the winding cylinder at the ends of the winding shaft and the machine roll, i.e. the pressure is higher in the roll end areas.

As is known in the art, attempts have been made to reduce the above-described problems 5 by rolling the surface of the cylinder with a slight groove which rises towards the edges and guides the air in the machine roll towards the edges of the roll. The disadvantage of this solution is that the surface of the machine roll is not always smooth but may include bumps and valleys, whereby the groove and the valley may be less pressurized and thus the air roll 10 may penetrate more into the air at such a position. In addition, the removal of air at the edges is difficult because the nip load in the edge areas is greater than in the center.

DE-A-199 27 897 discloses an adjustable, contact or transfer roll. The contact roll is e.g. a roll used for winding, partially covered by the web and pressurized to the web to be formed and which prevents air from entering the web, particularly at high winding speeds. In the middle stages of the contact roller, greater pressure can be applied than at the edges in order to squeeze the air carried by the web to the sides.

In turn, US Patent 6,604,703 discloses a roller using a deflection compensated roller. In addition to the winding cylinder, a separate press roll can be used, which is pressed against the web roll to be formed before the winding nip is opened. A separate press roll forms a roll nip after the winding nip with the web roll to be formed and the purpose of said roll nip is to prevent air from entering the web roll when the winding nip is opened.

EP-A-369 977 also discloses a roller using a deflection compensated winding shaft and a deflection compensated winding cylinder. The deflection compensated winding cylinder aims to keep the nip pressure as high as possible within the winding nip.

3

Referring to FI Patent Applications 20031384 and 20041287 for a curved adjustable roll, which describes a roll for paper, board or finishing machines, wherein the outer casing of the roll is supported at its ends by adjustable bearings on the machine body so that both the outer casing and control, i.e. the arc of the roll outer jacket is adjustable to compensate for the difference in tension between the edge and the center of the web. The roll consists of two mutually supported portions in the center of the roll, the inner tube and the outer shell. The material rigidity of the roll tubing material may be substantially higher than that of the 10 roll outer material. This type of double-diaphragm center-supported, curved-adjustable, even-diameter roll, so-called T-roll, is used, for example, in calendars as an output roll.

It is an object of the present invention to provide a method and apparatus for winding a fiber web in which the disadvantages and problems of the prior art solutions described above are eliminated or at least minimized.

Thus, one particular object of the invention is to provide a new type of rigid fluid that can influence the structure of a web roll.

20

In order to achieve the foregoing objects which have been set forth above, the process according to the invention is essentially characterized by what is set forth in the characterizing part of claim 1.

The device according to the invention, in turn, is essentially characterized by what is stated in the characterizing part of claim 5.

In the method and apparatus of the invention, it is realized to apply a separate, curvature-adjustable roll to influence the structure of the web to provide a circumferential force on the surface of the roll, which differs from through.

In accordance with an embodiment of the invention, a separate roll of adjustable curvature is applied to the roller for effecting the structure of the web, substantially during the entire winding and forming a roll nipple on the web to be formed. Preferably, the roll arc is adjusted so that the pressure of the roll nip between the roll and the resulting web roll does not increase, preferably decreases, towards the ends of the roll, thereby facilitating, for example, air removal from the web roll structure 10. In this case, the nip piping profile of the roll nip between the separate curvature-adjustable roll and the forming web roll is substantially flat or descending towards the edge areas (low profile).

According to a preferred embodiment of the invention, the roll nip between the separate curvature adjustable roll and the resulting web roll is preferably located after the winding nip, preferably as close as possible before the start of the next web layer. In this embodiment, the winding cylinder may also be a roll with adjustable curvature.

20

Preferably, the curvature adjustable roll used in the method and apparatus of the invention has an adjustable arc direction, thereby providing a plowing effect against the direction of rotation of the resulting web roll, which facilitates air exit from the roll as air exits the roll in its natural travel direction.

In connection with the invention, the curvature and the direction of the curve of the roll with adjustable curvature are adjustable during driving, whereby the tension profile of the incoming web can also be affected.

30 5

The advantageously curved adjustable curvature roll, which preferably has substantially the same type of roll as described in FI patent applications 20031384 and 20041287, has the advantage over the prior art bombarded rolls that a diameter difference is not obtained when using the roll according to the invention. and thus cross-track tension differences, such as further loosening of the loose edges.

The invention provides a minimization of the total amount of air in the winding because the winding nip between the winding cylinder and the forming web roll prevents air from entering the Tamaralla and the remaining nip in the web nip between the separate curvature adjustable roll and the forming web roll.

The curvature adjustable roll used in connection with the method and apparatus of the invention is preferably coated with a suitable soft coating, such as polyurethane or rubber, whereby the roll adapts to any irregularities in the surface of the machine roll with low air permeability.

According to a further advantageous feature of the invention, the surface of the roll is provided with a gently sloping groove towards the edges to further aid in the deaeration. The groove of the groove can be multi-headed.

According to a further advantageous feature of the invention, the roll is stolen by an electric drive to adjust the speed to the speed of the machine roll.

The invention is applicable to various ral limes used in winding of machine rolls, particularly suitable for use with Applicant's trade names OptiReel and OptiReelPlus and similar types of rally rolls. The advantages of the invention are particularly apparent when rallying fibrous webs with low air permeability.

6

In the invention, preferably, the nip force of the roll nip is controlled by measuring nip force at the ends of the roll with force sensors or by performing a nip pressure profile measurement of the roll directly from the nip based on an electromagnetic diaphragm or other pressure or force sensitive sensor or sensor strip. In addition, nip profile can be measured and the roll bending and curvature angle can be adjusted.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, however, the details of which are not intended to be limited in any way.

Figure 1 schematically illustrates an embodiment of a curved adjustable roll for use in the invention.

Figures 2-5 schematically illustrate an embodiment of the invention in which the invention is applied to a winder using a fixed secondary station.

Fig. 1 schematically illustrates an embodiment of a curvature adjustable roll 40 for use in the present invention wherein the roll outer jacket 42 is supported at its 20 ends by adjustable bearing 45 on the machine body so that the deflection of the outer jacket is adjustable to compensate for middle tension differences. The roll 40 consists of two supported parts in the middle of the roll, an inner tube 41 and an outer shell 42. The roll 40 shown in the figure is coated with a suitable soft coating 43 such as polyurethane or rubber. The surface of roll 40 may also be made with a gentle groove (not shown) rising towards the ends of roll 40. Preferably, the roller 40 is provided with an electric drive (not shown). The curvature adjustable roll 40 used in connection with the invention is preferably of the type disclosed in FI patent applications 20031384 and 20041287, but also other curved adjustable rolls of the same type are suitable for use with the invention.

7

The following Figures 2-5 schematically show the winding step just prior to moving the winding from the secondary station to the primary station, i.e. the changeover step, the winding step schematically shown in Fig. 3 with the finished roll and the winding moving to the primary station. from the primary station to the secondary station and the winding step schematically shown in Figure 5, wherein the winding carriages move to receive the next winding axis as the winding continues in the secondary station. In the figures, like reference numerals are used for like parts. In the embodiment shown in Figs. 2-5, according to the invention, the structure of the web roll 20 is influenced by a roll nip provided by a roll with adjustable curvature. The curvature adjustable roll is a separate roll 40 arranged in a nip contact with the web roll to provide a roll nip with the web roll in addition to the winding pin. In accordance with one embodiment of the invention, in addition to a separate roll having adjustable curvature, a roller is provided which is adjustable in curvature.

In the situation of Figure 2, web W is rolled to web 20 at a fixed secondary winding station. The secondary drive 25 is coupled to the winding shaft 24. In the vicinity of the secondary station, there is a surface mounting device 30. During winding, the winding cylinder 20 10 is in nip contact with the formed web roll 20. The use of the winding cylinder 10 is denoted by reference numeral 11 and in the direction of movement of the winding cylinder 10 by reference numeral S10. In the situation shown in the figure, the winding is just being changed around the next winding shaft 21, which is provided with a primary drive 26 and is placed in the winding carriages (not shown). The winding shaft 21 is brought into nip contact 25 with the winding cylinder 10 and the exchange is effected via the water exchange device 16 by cutting the web W and, for example, by the air blowing device 17 by guiding the web W around the winding shaft 21. The curvature adjustable roll 40 forms during the changeover the roll assist nip and the roll 40 is adjusted during rolling so that the nip pressure profile of the nip 30 between the roll 40 and the resulting web roll 22 is substantially flat or downward toward the edge areas. In the embodiment shown in the figure, the scrolling carriages are marked with reference numeral 21 'and the direction of their movement in the transfer step by reference arrows S21'.

5

In the situation of Figure 3, the winding is shifted around a new winding shaft 21 and the resulting web roll is denoted by reference numeral 22. The curvature adjustable roll 40 forms a roll nip with the forming web roll 22 to remove air from the web roll. In addition, the arc 40 of the roll 40 is adjustable, thereby providing a plowing effect against the direction of rotation of the formed web roll 22, which facilitates the escape of air from the roll as air exits the roll in its natural direction of travel. As shown in the figure, the roll nip N between the curvature adjustable roll 40 and the resulting web roll 22 is preferably located as close as possible before the start of the next web 15 of the web to be rolled, but typically within the upper arc of the circle of the web roll 22. The surface of the finished roll 20 located in the secondary station is secured by a surface securing device 30 to prevent winding loosening. The surface binding device 30 is shown by the arrow S30 is moved from its standby position to a surface position (Fig. 2). At this point, the winding cylinder 10 and the new web roll 20a 22 formed are displaced from the secondary web station 20 as shown by arrows S21 and S10.

In the situation shown in Fig. 4, a finished web roll 20 'is displaced from the secondary station. The transfer is indicated by arrows S20. The surface securing device 30 is detached from the web roll 25 and at this point leaves the primary web to move the resulting web roll 22 together with the winding cylinder 10 as shown by arrows S21 and S10 toward the secondary winding station and the curvature adjustable roll 40 The future position of the forming web roll 22 and the winding cylinder 10 in the secondary position is indicated by intermittent butterflies.

9

As shown in Figure 5, once the web roll in the winding has been moved to the secondary station, the web to be rolled is again denoted by reference numeral 20. Rolling carriages are returned as indicated by arrow SV towards the next winding axis 21 when the secondary roll has grown to the desired diameter. The curvature adjustable roll 40 is in the waiting position and moves to the new winding shaft 21 as the winding changes to a new winding shaft to wind the next web roll.

The invention has been described above with reference only to some advantageous embodiments thereof, the details of which, however, are not to be construed as being limited in any way.

Claims (11)

A method of rolling a fiber web, in which a web (W) is wound around a rolling shaft (21) to a web roller (22) by mediating a rolling nip (RN) between a rolling cylinder (10) and the web roller (22). ), characterized in that the structure of the web roll (22) is affected by providing a roll nip (N) between the web roll (22) and a separate, curvilinear roll (40) and by controlling the curvature and / or the direction of the curvature of the various , the curvature adjustable roller (40) during rewinding. 10 2. A method according to claim 1, characterized in that the curvature of the different curvilinear roll (40) is regulated in such a way that the nip pressure in the nip (N) between the various curvilinear roll (40) and the web roll (22) is not formed. increases, advantageously decreases, towards the ends of the roll. 15 3. A method according to claim 1 or 2, characterized in that the direction of curvature of the different curvilinear roll (40) is regulated in such a way that a plowing effect is produced against the direction of rotation of the web roll (22) formed. 20 Method according to any of claims 1-3, characterized in that the nip pressure and / or the force and / or the nip profile acting in the nip (N) is measured by mediating at least one pressure-sensitive measuring film (50), which pressure-sensitive measuring film ( 50) is installed in conjunction with the different, curvature adjustable roller (40). Device in a wheelchair for a fibrous web, comprising a rolling cylinder (10) for providing a rolling nip (RN) with a web roller (22), characterized in that the device comprises a separate, adjustable roll ( 40), which forms a roll nip (N) with the web roller (22) formed, the structure of the web roller (22) being affected by controlling the direction and / or the size of the curvature of the various curvilinear roller (40) during the reel. 6. Device according to claim 5, characterized in that the various curvilinear roll (40) comprises an outer sheath (42) supported at its ends on the body structures of the wheelchair by means of an adjustable bearing (45). 7. Apparatus according to claim 5 or 6, characterized in that the separate, curvilinear roll (40) consists of two at the middle region of the roll of mutually supported parts, an inner tube (41) and an outer jacket (42). Device according to any of claims 5-7, characterized in that the separate, curvilinear roll (40) is coated with a soft coating (43). 15 Device according to any of claims 5-8, characterized in that the separate, curvilinear roll (40) is provided with electrical operation. 10. Apparatus according to any of claims 5-9, characterized in that the rolling cylinder (10) is also a roll adjustable roller. Device according to any one of claims 5-9, characterized in that the roll nip (N) between the various curvature adjustable roll (40) and the web roll (22) formed is advantageously positioned after the roll nip (RN) as close as possible. at the beginning of the following track turns.