FI121593B - Arrangement and method of winding the fibrous web - Google Patents

Description

Arrangements method for winding a fibrous web

The invention relates to an arrangement in a reel, wherein the reel is arranged for continuously winding the fibrous web around a reel roll as a machine reel, wherein the reel reel and running around the virtual axis.

The invention also relates to a method of winding a fibrous web, wherein the fibrous web 10 is continuously wound around a reel roll into a machine roll, wherein the reel winding roller and the reeling machine roll are pressed against each other to form a nip contact.

15 A web winder is a device that winds material produced as a continuous fibrous web into a machine reel. In a fiber web production process, rewinding is usually the first sub-process in which continuous production is interrupted sequentially. The machine reel is formed around a reel core acting as a reel core, i.e., one fiber web on the reel has a beginning and an end. A continuous trend in the field 20 is the continuous increase in the size of the machine rolls, which causes a constant need for development of the rollers. to ones. However, since it is a dynamic environment, the fibrous web is a rollable material susceptible to various faults, the role of the reel or paperboard in maintaining the efficiency of the machine is very significant. Behind the constant growth in machine reels, one of the reasons is the desire to get fibrous web production

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25 less disruptive or disruptive to production and less efficient. beginning and end.

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Controlling the runnability and winding of lightweight fibrous web types using a rewinder is particularly challenging because lightweight fibrous web types tend to be weaker than heavy fiber webs in terms of tensile or tear strength and thus susceptible to damage.

. ! ·. 30 Rupture of the fibrous web causes the fibrous web to break, resulting in • · · production stopping until the end of the fibrous web can be reintroduced through a *: ** production machine and re-wound on a new reel reel. When changing the machine roll, the fiber web is intentionally cut and the fibrous web from the production machine is guided to roll around the new reel roll. For light fiber-35, this is kind of a simple operation because the fiber web breaks easily 2. On the other hand, the fibrous web may not break in the desired manner, in which case the fibrous web will break, but will not roll in the desired manner around the new reel web. In some cases, the bottom of the machine reel forms a multi-fold folded bottom of the fibrous web that "appears" through a plurality of rolled layers-5, causing a possible winding failure.

One such challenging situation is, for example, in the production of a thin or lightweight fiber web, for example, the lightest species of the sort range produced on a particular production machine. For thin or light fiber types, even a small opening may begin to uncontrollably rupture. In principle, one of the most controllable types of change-over reels 10 is a water-cutting device which, under suitable conditions, can provide a well-started machine reel formation, i.e., a relatively smooth machine reel base. The water cutting change may fail when the tear of the light fibrous web begins at the point where the water is cut. Most commonly, water cutting is performed across the center of the fiber web in transverse direction by two water cutting nozzles 15 along the edges, whereby, as the fiber web advances during cutting, a sharp wedge is formed which is guided or guided to roll around a new reel roll. Similarly, the tails formed on the side of the water-cut wedge remain on the surface of the old machine roll. These tails do not withstand the adjusted tension of the fibrous web but at some point the tension of the fibrous web causes the uncut tail to break. If this break occurs too soon after the start of the water cut, the cut tip has not yet begun to roll around the new • V: machine roll, and replacement may be possible. Local transverse tension differences in the fiber web worsen the situation. A break can also originate at the edge, especially if the edge tension is higher than the center.

In the description of the present invention, the following designations are used to denote: *.]. * For ease of reference: the machine direction (MD) is used to denote the x direction, the cross direction, CD) is called the y-direction and elevation is called the z-direction. Fiber Input ·· ♦: The direction is referred to as the upstream direction and the fiber web direction is referred to as the downstream direction. The reel core is referred to herein as a reel spool, but could equally be called a reel axis.

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An object of the invention is to improve the runnability and interchangeability of the retractor. By interchangeability is meant herein the ratio of successful interchanges during the interlocking interchange sequence to interruptions in interruptions.

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Another object of the invention is to reduce the variation in the x-direction of the fiber web caused by oscillation of the machine roll in the y-direction of the fiber web, i.e., to smooth out the variation in the tension profile of the fiber web. More particularly, the invention relates to a method of oscillating a method in which the winding cylinder 5 of a retractor 5 and a roll of machine roll are pressed against each other in a nip contact and the oscillation is performed by rotating the machine roll and the winding cylinder about a virtual axis. Such oscillation is disclosed in Fl 20055278.

It is also an object of a preferred embodiment of the invention to provide a method for delaying the cross-tear of a fibrous web in a water-cutting machine for cutting a fiber web, whereby the ratio between the cross-cut and the torn web width can be changed.

The arrangement according to the invention in connection with a reel winder is characterized in that the roller closest upstream of the winding cylinder is a runnability control roll whose curvature and curvature direction can be actively varied according to oscillation so that the tightening of the fibrous web edges is at least partially compensated.

The method according to the invention is characterized in that, in the upstream direction of the fiber web ..... 20, the curvature and curvature of the runnability control roll prior to the winding cylinder can be actively varied according to the oscillation such that the change in wrapping partially tightening the edges of the fibrous web due to oscillation.

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The arrangement and method according to the invention thus provide a fiber web path. 25 length adjustment at various points in the fiber web, in the middle and at each edge. Hereby, the tension profile of the fibrous web is also changed locally prior to the winding reel. The method according to the invention enables the optimum fiber optic web to be changed at any one time, while also allowing, for example, a water cutting change of light fiber types. When used in accordance with the invention, the runnability control roller compensates for differences in fiber tension between the edges of the fibrous web and the center caused by oscillation, thereby reducing the risk of warping and web breaking.

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likely to decrease. Also, the properties of the fibrous web remain smoother because the edges are not stretched too much due to excessive tension.

The term runner control roll used in the present invention refers to a roll having at least the curvature and curvature control of the roller production run, the runner adjusting roll being actively controllable according to the particular sequence or sub-step of the reel 5. In its structure, the runnability control roll is most preferably a center-supported composite roll, which comprises two shells supported at one another along the center line of the roll, so-called. outer sheath and inner sheath supported by bearings in the support structure so that the position of the ends of the shells relative to each other can be adjusted radially (curvature adjustment 10) and circumferentially (curvature adjustment): An example of such a fiber web a roller under the tradename Flymaster developed by this patentee whose active curvature and curvature can be actively altered. This roll is described in more detail in Grant 1111554 B and in its further developed form 15 in Patent 1111464B.

In accordance with the prior art, patent application F1 20065764 discloses that such a roll according to said patents F1155554 B and F117646 B can be used as a press roll roller in such a way that the roll roll to be formed has a slightly curved or spreading surface pull.

In the following, the invention will be explained in more detail with reference to the accompanying figures, in which: - Fig. 1a illustrates a retaining roller in general and a runner adjusting roller; - Fig. 1b shows an example runner adjusting roller; curvature as viewed perpendicular to the curvature direction, Fig. 1c shows an example of the curvature of the runner control roll viewed from the side, ··· · ···. Figure 2 shows the y-direction distribution of the x-axis tension caused by the oscillation of the fiber web, · · · *. - in the figure, an example of the structure of the runner control roll, • · ·: Y: 30 - Figure 4 shows the fibrous web during water cutting.

Fig. 1 shows a general view of the reel 1 and the runner adjusting roll 18. The reel 1 is arranged for continuously winding the fibrous web W around a bore roll 5 into a machine roll 6, whereby the reel cylinder 10 and the can be reeled in an oscillating manner such that the reel roll 5 and the reel cylinder 10 are pivotable about a virtual axis O reciprocating vertically 5. Then, during the production run, the fiber web W is continuously wound around a reel roll 5 into a machine roll 6, whereby the reel cylinder 10 of the reel 1 and the reel machine roll 6 are pressed against each other to form a nip contact. N around a vertically extending virtual axis O. Thus, by means of oscillation, the various layers of fiber web can be rolled onto the machine roll in a slightly interleaved manner relative to one another, whereby any irregularities in the thickness, bulk, compressibility, moisture, etc. of the fiber web are smoothed slightly. In oscillation, the end of the reel 15 5, which is the core of the machine reel 6, can, for example, move about 10 meters wide in a reel of about ± 50 mm in the x direction. Preferably, the vertical virtual axis O passes through the nip N, but it can also be set to pass through, for example, the center or mandrel of the winding cylinder, or alternatively at some point on the machine roll.

Upstream of the winding cylinder 10, the closest roll is a runnability control roll 18, whose curvature Δ and curvature direction a (exemplified by: ·: vastly illustrated in Figures 1b and 1c) can be actively • · modified by oscillation due to oscillation ·.: / · The tightening of the W edges of We is at least partially compensated. The change in curvature:: *: 25 compensates, at least in part, for the tightening of the W edges of the fiber web W by the oscillation, such that the length of the path traveled by the fiber web varies with the fiber. in the web width direction when changing the curvature and curvature direction of the runner control roll. Oscillation, on the other hand, causes the fiber web to ...... extend its length. More specifically, this tightening of the edges of the fiber web caused by oscillation is illustrated in the y-**; ** tension distribution shown in Fig. 2. For a given type of fiber web in the example, a 50 mm x-directional oscillation shift relative to the x-position of the centerline causes f ': 180 N / m to increase tension in the periphery of the fibrous web about 5 meters from centerline C.

Preferred embodiments of Figures 1a, 1b and 1c are, for example, that the curvature Δ of the runner adjusting roller 35 is adjustable between 0 and 150 mm measured at the centerline C of the runner adjusting roller. According to a further preferred embodiment 6, the direction of curvature α of the runner adjusting roll 18 is adjustable with respect to the adjustable zero direction by ± 30 °. It is also preferred that the position of the runner control roll is adjustable on the winding cylinder 10 of the fibrous web W to adjust the inlet angle β. Hereby, the angle of coverage of the fibrous web W, i.e. the angle 5 of the fibrous web in contact with the surface of the winding cylinder 10, can be adjusted if necessary. Similarly, for example, in the threading step, when inserting the fibrous web onto the reel, a slight bending angle around the roll is generally easier than a steep angle. For example, this adjustability allows the runner roll for positioning the fibrous web to be placed in a position where the folding-10 angle around it is only 30 degrees while the normal production driving position may be such that the folding angle is 100 degrees. In general, when oscillating, the vertical passage from the runner control roller prior to the roller cylinder 10 to the roller cylinder minimizes the tension difference between the edges We and the center region C, since the distance between these rollers changes only slightly. On the other hand, the runner control roller allows the web to be introduced at an angle of less than 90 degrees to the winding cylinder (vertical export). This makes the threading easier, especially in cordless cases, because of the cheaper layout. Also, the placement of replacement devices (e.g., water cutter bar) is easier to place before the reeling cylinder due to the more economical layout.

A further preferred embodiment is illustrated in Fig. 1b, wherein the direction of curvature of the drive-20 frequency-adjusting roll 18 is adjustable by changing the position of the ends of the run-adjusting roll 18 so that the output angle Θ of the fibrous web W is adjustable. In practice, this can be accomplished, for example, by the same means as the adjustment of the curvature Δ, but driven by [· * the ends of the adjusting roll 18 being slightly differently controlled.

Fig. 2 shows an exemplary calculation of the tension change caused by the twisting of the fibrous web. This is a WF paper having the following characteristics: basis weight: 100 g / m2, humidity 5%; ···; SMD = 600000 N / m \ 30 ScD = 250000 N / m ::; V Smdco = 300000 N / m * ··· * vmd = 0.70 • vCd = 0.30 • · ·: ··: fiber web width = 10 m 35 free spacing = 5 m

Rotation of the reeling cylinder: s = 50 mm (per head, centerline C remains stationary).

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The change in tension depends on the free web length and the free web length depends half of the roll grip. The roll after the pivot in this example is a solid winding cylinder. If the rolls are solid so that the roll grip is greater than the tension difference across the roll, the free web length is the distance between the rolls. If there is an air film between the rolls and the track, the free web length is correspondingly extended to the next holding roll. Practical cases are usually between these extreme cases. The rollers can slip around the edges and hold in the center. The change in tension is: AT = Ae * S, where S is the machine tensile stiffness of the paper and Δε is the change in elongation. Typical values for the tensile stiffness of a fibrous web include the following LWC: S = 400000 N / m, 10 WF: S = 600000 N / m, Liner: S = 800000 N / m. From Figure 2, it can be readily seen that at a relatively short 5 m clearance, the edges of the fibrous web tighten relatively much. In this example, the tension is in the order of 180 N / m at the edges relative to the center. Such a difference in tension can cause the fibrous web to sag or, at worst, even break the fibrous web.

According to a preferred embodiment, the curvature and / or direction of curvature adjusting roll 18 is actively altered according to the oscillating sequence of the winder 1 to locally change the tension profile of the fibrous web W prior to the winding cylinder 10. control system. Alternatively, the curvature and / or direction of curvature of the runner adjusting roll 18: is altered according to the tensile profile of the measured prevailing fibrous web W • ·: .Σ .; optimum value.

• · · * · * *:] *. Figure 3 shows an example of the structure of a runner control roll. In Fig. 3, the runner adjusting roll 18 is a center-supported composite roll comprising a sheath supported by two rollers in the region of the center line of the roll, an outer sheath 181 and an inner sheath ***** 182 supported by bearings 185 in a support structure 60, 80 such that the position of the ends 56, 66 of the diapers relative to one another is adjustable in radial direction to adjust the curvature Δ of the runner control roll 18. Further, the drive roller 18 is supported by bearings 185 on the support structure 60, 80 such that. . *. the position of the ends 56, 66 of the diapers relative to one another is adjustable in a circumferential direction ···. a for adjusting the curvature a of the runner adjusting roll 18. In practice, this can be accomplished in the structure of Figure 3 such that the direction of the conductors 82 may be altered relative to the other structure. In practice *: “: 35 There are several options and options for doing this, but the 8 basic principles are the same. Figure 3 also shows, by way of example, actuators 86 and 90 for radial control.

Figure 4 illustrates one situation where a thin or lightweight fiber web type W is produced, for example the lightest species of a variety of types produced on a particular production machine. For thin or light fiber types, even a small opening may start to uncontrolled tear. In principle, one of the most controllable types of change-over reels is a water-cutting device which, under suitable conditions, can provide a well-started machine reel formation, i.e. a somewhat smooth machine reel base. Water cutting exchange may fail when kb-10 vyen fiber web rupture 15 originating from water-cut section 10. The most commonly water-cutting is carried out a fibrous web into C in the transverse direction in two vesileik-kaussuuttimella 12 of the fiber web towards the edges We, wherein the fibrous web W proceeds section within the direction of arrow A, a sharp wedge, which is guided or guided to roll around a new reel reel. Typically, the shear path 11 15 becomes slightly curved because the fibrous web W proceeds at a constant speed and it takes some time to accelerate the water shear nozzles from zero speed to maximum speed. The portion of the intended water cutting path in Fig. 4 which has not yet been cut is shown by dashed line 11. The tails of the fibrous web W formed on the side of the water cut wedge remain on the surface of the old machine roll. These tails do not withstand the adjusted tension of the fibrous web, but at some point the tension of the fibrous web W causes the uncut tail to break along the exemplary tear 15 shown in Fig. 4. If this break-in occurs too soon after the water cutting: V: start, the cut tip has not yet begun to roll around the new machine roll: failure of replacement is possible. The local • · · • 25 transverse tension differences in the fiber web exacerbate the situation. Such a worsening • · · · transverse tension difference can, at worst, completely reverse the rupture direction .1 ··. in the x direction so that the fibrous web does not break but tears in the propagation direction of the fibrous web. This is very unlikely with a water cutter and ... is mainly related to a malfunction, but for some other types of handhelds, · · · *;] / 30 this is more likely. A break can also originate at the edge, especially if the edge tension is higher than the center. In principle, you can: try to remedy this by reducing the tension of the fibrous web just before water cutting, whereby ···: ***: the fibrous web will not break so easily. Most commonly, regardless of the type of replacement equipment, one • · ·. ·. a preferred embodiment is that the tension profile is modified by the runner control roll • · · ν · | 35 18 while the oscillation sequence is * 'stopped at its zero value. The optimum tension profile during the replacement sequence may not be the same as during the actual winding production run.

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Still another preferred embodiment relates to the weaving sequence of the fiber web. Hereby, during or during filament winding of the fiber web W, the oscillation sequence is stopped at zero and the curvature and / or direction of curvature control roll 18 is changed such that the length of the fiber web path upstream of area shorter than middle region. This ensures the desired secure and fast threading without the need to cut the wide-width fibrous web strip unnecessarily due to factors related to the fiber web machine geometry.

10. • 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 • · · • · · · 10

Reference numerals used in the drawings: I roller 10 winding cylinder II water cutting path 5 12 water cutting nozzle 15 fibrous web rupture 18 run control roll 181 outer sheath 182 inner sheath 10 185 bearings 55.65 ends 60.80 support structure 82 guides; 86.90 actuators • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 5. 6 machine rolls • · • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · W fiber web • · · · ·: 20 We edge of fiber web · · · · · · ** N nip • 1 • · · · · · · C centerline O oscillation rotation axis 11a curvature direction β inlet web Δ curvature Θ starting angle of the fiber web 5 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Most either either either 1 · · · · · · · · · ·

Claims (12)

An arrangement in connection with a reeling device (1), wherein the reeling device (1) is adapted to continuously roll up a fiber web (W) around a tambour roller to a machine roller (6), wherein the reeling cylinder (1) of the reeling device (1) 10) and the machine roller (6) to be rolled up can be pressed against each other to form a nip contact, and which fiber web (W) can be rolled up oscillated, so that the tambour roll (5) and the reel cylinder (10) can be turned back and forth around a virtual axis (0) running in the vertical direction, characterized in that, as the nearest roller in the upstream direction in relation to the reel cylinder (10), there is an executable control roller (18), whose curvature (Δ) and curvature (a) can be actively varied according to the oscillator , so that the tension of the edges of the fiber web (W) caused by the oscillation can at least partially be compensated. Arrangement according to claim 1, characterized in that the drivability control roller (18) is a composite roller supported at the center, comprising two sheaths supported against each other in the region of the center line of the roller, an outer roller (181) and an inner roller (182), which are supported by bearings (185) against a support structure, so that the mutual position of the ends (56, 66) of the sheaths is radially controllable to control the bend (Δ) of the drivability control roller (18). · · · · · · · · · 3. Arrangement according to claim 1, characterized in that the drivability control roller (18) is a center supported composite roller, comprising two sheaths supported against each other in the region of the centerline of the roller, an outer roller (181) and an inner roller 25 ( 182), which are supported by bearings (185) against a support structure (60, 80), such that the mutual position of the ends (56, 66) of the sheaths is adjustable peripherally (a) to regulate the drivability control roll (18). ) direction of curvature (a). 4. Arrangement according to Claim 1, characterized in that the curvature control selector (Δ) of the curvature (Δ) is adjustable between 0-150 mm measured at the center line (C) of the:]] controllability control roller. 5. · Arrangement according to claim 1, characterized in that the curvature direction (18) of the drivability control roller (18) can be oriented ± 30 0 compared to an adjustable zero direction ·: ··: 35 accession. 15 Arrangement according to claim 1, characterized in that the position of the drivability control roller can be controlled to control the angle of incidence (β) of the fiber web (W) to the roller cylinder (10). Arrangement according to claim 1, characterized in that the direction of curvature of the drivability control (18) can be controlled by changing the mutual position of the ends of the drivability control roller (18), whereby the output angle (Θ) of the fiber path (W) can be controlled from the drivability control roller (18). 10 A method of rolling a fiber web, wherein the fiber web (W) is continuously rolled up about a tambour roll (5) into a machine roll (6), the reeling cylinder (10) of the reeling device (1) and the machine roller (6) being wound up pressed against each other to form a nip contact and which fiber web (W) can be unscrewed up so that the tambour roll (5) and the reel cylinder (10) can be turned back and forth around a virtual axis running in the vertical direction, characterized in that the curvature ( Δ) and the bending direction (a) of the executability control roller preceding the rolling cylinder (10) in the overcurrent direction of the fiber web (W) can be actively varied according to the oscillation, so that the change of curvature at least partially compensates for the tension of the edges of the fiber web (W). 20 cillation. • · · v Method according to Claim 8, characterized in that the curvature and / or curvature of the drivability control roller: V: (18) are actively varied according to the oscillation frequency of the reel (1) to locally change the voltage profile of the fiber web (W). file before the reel cylinder (10). ··· · • · · ♦ · · ♦ · ♦. ···. Method according to claim 8, characterized in that the curvature and / or curvature direction of the drivability control roller (18) is varied according to the measured ... saving voltage profile of the fiber path (W) to the optimum value with respect to the drivability. : ··· Σ 30 Method according to claim 8, characterized in that the voltage profile is further reduced by means of the executable control roller (18) during the rewinding device (1): ***: change sequence, even if the oscillation sequence has been stopped at its zero value. • · · • • 9 9 9 9: · Σ l 35 12. A method according to claim 8, characterized in that during the peaking of the fiber web (W) * or for the time it is applied, the oscillation frequency has been stopped at its zero value and the curvature and / or curvature direction of the curvature control roller (18) is changed, so that the length of the fiber web route from the roller which precedes the drivability control roller (18) in the overflow direction via the drivability control roller (18) of the reel cylinder (10) is shorter within the edge region of the fiber web (W) than within the center region. 5 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ··· · · · · ··· ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3 ·