FI111927B - Method and apparatus for winding a paper web - Google Patents

Description

111927

Method and apparatus for winding a paper web

The invention relates to a method for winding a paper web, in which a paper web from a paper machine and / or paper finishing is rolled onto a single reusable core for re-use. around the reel roll. The invention also relates to a reel for carrying out the above method.

A continuous paper web of several meters wide, either directly from a paper machine, or from a paper finishing apparatus connected to it continuously on-line type 10, or separate off-line type finishing equipment, is rolled in succession on a reel. These large machine rolls, which essentially correspond to the paper production width, serve as a kind of intermediate storage of paper web between off-line post-processing processes. Such further processing may be related, for example, to paper coating and calendering. At some later point in the off-line processing of a full-width paper web, the web rolled to such machine rolls at a substantially production width is rolled open and cut lengthwise into narrower sub-webs, which are further formed into customer rolls. The width and size of the customer rolls are adapted to customer requirements and further use.

I · »i, f ·: As a result of the constant effort to increase the web width, drive speed and utilization rate of paper machines, this results in a trend both in width and diameter, and thus in total weight, · * ·. for larger machine rolls. For wide machines, roll weight, · ·. now usually exceeds 50 tonnes.

t · ·,, The following describes this increase in the total weight of the machine rolls, »30, as well as the increase in the width of the paper web during roll-up ai-. ·: Related practical problems and disadvantages.

> · ··. Especially for dense and heavier grades of paper, such as for example printing presses, the so-called reel axis. the * * · 35 stack of paper on the reel reel causes the reel of the reel, which is only on the end bracket, to be the length of the reel. This deflection 2 111927 constitutes a significant factor limiting and aggravating the winding event, as described below.

The current state of the art in winding is described, for example, in Mikko Jokio, Papermaking Part 3 Finishing, published by Fapet Oy, ISBN 952-5216-10-1, 1999, p. 143-235.

In the fasteners, the paper web is introduced into a so-called roller cylinder. through a nip roll to the actual reel roll, on which the paper web itself rolls. 10 The clamping force between the nip roll and the reel for the reel roll, i.e. nip force is an essential variable in the roll-up that controls the tightness of the roll formed on the roll. The nip force used is not necessarily constant, but can be varied for the same paper grade as a function of the amount of paper accumulating on the spool roll, and different nip force values varying for the different paper grades and varying as the amount of paper accumulates on the roll. Typically, the tensile strength, or i.e. the density, of the material rolled onto the reel is tended to be slightly decreasing in the radial direction of the roll so that the lower layers are not compressed by too tight surface layers.

: · Gradually rolled paper resulting from the mass of paper on the reel roll; : As the sentence progresses, the increasing deflection of the reel roll causes: ·. the nip force between the nip roll and the paper roll accumulating on the reel reel does not “· 25 remain constant across the paper web, i.e., in the longitudinal direction of the reel reel. At the ends of the spool roller closer to the support points, the downward deflection of the roll by gravity is less than in the center of the roll, which accordingly causes a change in the nip force in the longitudinal direction of the roll. The exact nature of the change depends on the roll: In addition to the amount of paper stock that has accumulated, the position of the nip roll relative to the reel roll is either directly on the side of the reel roll or, respectively: ·! above or below (see, for example, Papermaking Part 3, pp. 151-152).

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As a result of the above-described phenomenon, the production of a purely end-bearing high-mass tam-Oi wood roll substantially equivalent to the present webs, with the radial density profile 3111927 of the roll remaining similar to the state of the art .

It will be readily appreciated that the change in radial density pro 5 of the reel roll due to the variation in nip force described above results in internal tension forces on the roll, which easily lead to a deterioration or immediate damage to the roll properties of the roll paper.

Furthermore, as the reel rotates during roll, the deflection of the reel generates an internal, cyclically varying force on the paper roll, because each rotation of one half revolution reel can be thought to simultaneously shift from its respective extreme position to its opposite opposite position, causing a corresponding deformation of the paper.

The phenomena of spindle roll deflection described above can damage the paper web rolled on the spool roll in the roll surface layers or in the deeper roll. In addition to the changes or damage to the pape-20 web immediately upon winding, the stresses remaining on the roll make further processing of the web difficult during the following winding: · and off-line operations.

·. The self-movement of the paper web and the rapidly rotating rolls provide a strong airflow on the surface of the paper web and rolls, which can lead to a. for transporting the man under the outer or outer layers of the reel web, and further forming an air bag in front of the reel sealing nip roll. If the air bag is allowed to collapse through the nip, this will cause wrinkling errors in the paper web reeled onto the reel roll. pleats. An air bag may also be formed under the paper web running over the nip roll before the nip if :! The nip force is so great that the air cannot pass through the nip itself! ···, the reel reel is prevented. The formation of an air bag that complicates the roll-up process occurs especially with denser, less inferior grades when wrapping a full-width paper web. Typical examples of this are, for example, winding coated or calendered paper grades into wide machine rolls.

4 111927 A nip roller with grooved or perforated surface can be used to prevent the formation of air bags. Examples of such nipple parasites are given in Papermaking Part 3, p. 157-158. However, a common problem with such prior art solutions is that the grooved or perforated surface of the nip roll also easily undesirably modifies the paper web itself.

It is an object of the present invention to provide a method which avoids the problems of winding and / or air bag formation of the reel rolls described above with regard to the winding of increasingly large and wide machine rolls. To accomplish this purpose, the method according to the invention is essentially characterized in what is set forth in the characterizing part of claim 1. The reel winder according to the invention, in turn, is characterized by what is set forth in the characterizing part of claim 10.

The method and apparatus of the invention are characterized by the following features that improve the performance and controllability of the rewinding process and maintain the quality of the paper webs contained in the resulting rolls.

* · · ·: For longitudinal cutting of paper coming from the paper machine and / or after finishing:. the web as partial webs as early as possible, preferably as early as * * *! ·· '·, * 25 before the first rewinding, significantly reduces the internal load and stresses in the individual roll due to the warping of the uniform reel * For a paper roll / roll. In a narrower roll, the stresses can also be discharged through the relative motion of the paper layers 30 without tearing the paper web more easily than if the situation is compared with the case of a wide web.

Rolling two or more contiguous sub-webs onto a roll * allows you to match that particular web. winding the partial webs so that there is space between the rolls 35 for the support member or members for supporting / supporting the reel roll * i in addition to the end bracket from one or more support points along the axis. With this extra support you can prevent / reduce bending of the reel roll.

By dividing a full-width paper web using length splitting into partial webs, the sensitivity of the production process to errors in the web width direction, i.e. the so-called process width, is reduced at the same time. the profile resistance increases because the effect of the poor portion of the web is limited to the region of only one or a few sub-webs.

10 The air trapped between the rollers and paper webs formed on the reel roll and / or the nip roll and paper webs is significantly easier to escape from the edges of the narrow sub-webs than in the case of a full-width web. This reduces the susceptibility of the formation of the air bag during winding, particularly with poorly permeable webs.

15

If necessary, completely separate nip clips may be provided on the individual sub-webs, which, despite the possible deflection of the reel roll, allow each sub-web and the corresponding roll to be wound more closely with the same nip force when reeled than with one of these full width nip rolls. If necessary, different partial webs can also be sealed using different nip forces. ·: * Of these when using a nip roller, the roll may be so-called. deflection compensated: ··· type, whereby the nip force of the rolls corresponding to the various sub-webs can be nipulated; . ·. compensate for the reel roll deflection.

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With the aforementioned narrower nip rolls, the air passage to the reel reel can also be expected to be further reduced due to the fact that the contact line between each nip roll and the reel, so-called. the nipples remain straighter and tighter. The difference is most pronounced when ver-V 30 solves the situation in the case of a non-deflection full-width nip roll. The air between the narrow part webs and the corresponding rollers is also easier to escape.

The invention will now be described in more detail by way of example with reference to the accompanying drawing, in which: Figure 1 schematically illustrates the method of the invention in plan view; Figure 2 illustrates in one case additional spool support in addition to the normal end bracket 5; Figure 4 shows a top view of the use of separate nip rolls to compensate for the change in nip force caused by the bending of the spool compensated nip roll when the reel roll is deflected to the reels corresponding to the different sub-webs.

15 Figure 1 shows a top view of kiinnirullauslaitteisto with a full-width (width of the production or finishing treatment step width equivalent), the paper web W is passed in the direction of arrow C, the cutting station cutting means operating region. The cutting members can be mechanical blades according to known solutions, e.g. rotating blades or counter-blades, which make longitudinal incisions in the passing paper web separating the narrower partial webs W1-W5 from the web. Partial · · · The separation can also take place without the use of actual mechanical blades, whereby cutting is carried out, for example, in so-called. vesisuihkuleikkauksena. In general:. according to the solution used, the cutting members (blades) are arranged in pairs above and below the paper web 25, the upper and lower blades may be glued; interweave synchronously with each other according to the desired partial width of the paper web using known mechanical solutions • »'·· *. In Figure 1, the arrows for the cutting members corresponding to the various sub-webs are intended to illustrate the lateral adjustment * * · 30 of the cutting members.

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After the longitudinal sectioning, the partial webs W1-W5 advance to the dispensing and guiding apparatus S having means for laterally guiding the partial webs as needed apart from each other, and further through the nip roll D 35 to the reel roll R into separate rolls R1-R5. Distribution and control / ·; the apparatus S can be implemented using mechanical solutions known per se, as well as winding the webs by means of a nip roller D 7111927 for spool roller R may use known per se interactions between the nip roller and the Tam drill roll, as well as supporting and auxiliary roller solutions as needed. In addition to the nip roller alone, a combination of a nip roller and a belt may be used, or some other known n-5 stacking mechanical solution known per se. The reel roll R may be of a known type, i.e. a metal body roll rotatable at its ends into the bearing housings. In the case of a center-driven reel, the reel roll is rotated by its own drive.

10 When the rolls R1-R5 reach their desired maximum ring size, import of a new Tam drill roll and threading of the webs in question. and the removal of the finished reel can be accomplished using methods known per se which allow the reel to be changed without changing the speed of the paper web W arriving at the apparatus of Figure 1.

15

If necessary, the longitudinal sectioning of the partial webs may be temporarily interrupted for all or at least some of the partial webs until the threading of the partial web / webs to the new reel reel is completed and the winding around the new reel reel has begun. In this case, the change of the rolls 20, i.e. the passage of the web around the new reel reel, can be carried out as wide as necessary.

The apparatus shown in Figure 1 includes one set of cutting members / pairs of cutting members for use in longitudinal cutting. In another aspect of the invention, t | *.] In 25 embodiments, the number of cutting members / pairs of cutting members may be

Iita such that two so-called. a second set of blades which is currently detached from the paper web can be preset to correspond to the new width values of the sub-webs, the first set of which being guided to the paper web and performing longitudinal cutting.

By following this procedure, when replacing the reel roll, said first set of blades can first be guided off the paper web (or, for example, in water jet cutting, the jet cut off), and when the paper web head is introduced into a new roll 35, the cutting jet initiates) and thus initiates longitudinal sectioning without the time delay required by lateral adjustments of the paper web of said first series of blades.

8 111927

Fig. 2 illustrates the deflection of the roll due to the weight of the paper rolled on the reel roll R in a situation where only the conventional end bracket (EB1 and EB2) is used to support the roll. The deflection of the tampon roller relative to the straight axis line (indicated by the dotted line), which also corresponds to the change in the nip line, is shown in Fig. 2 by the dotted line.

Figure 2 also illustrates a reel roll support to be provided between the reel roller sub rollers of the present invention in an embodiment where two intermediate supports (IB1 and IB2) are applied to the reel roll to prevent / reduce bending / oscillation of the reel roll. However, the invention is not limited to the use of two spacer points as shown in Fig. 2, but there may be one or more spacer spacers 15, and their longitudinal positioning on the reel roll may be selected to suit the number and width of the respective webs / rolls.

When using a spool reel support, an advantageous embodiment for providing a bearing at the point of loading between the support member 20 and the rotating reel reel is the use of a bearing, e.g., a wide contact surface and / or gas or liquid medium. where the surface pressure exerted on the surface of the reel spool:. and the friction is such that the second bearing surface can act directly on the normal surface of the 25 reel rolls without any modification treatments. In this case, the taper / points of the intermediate supports may be freely selected to suit the number and width of the webs / rolls being manufactured, without having to make changes to the reel itself.

* * *: '. · 30 However, the invention is not limited to the use of the bearings as described above, but the intermediate support of the reel roller at the point of loading between the support member and the rotating reel roller may be implemented by means of known mechanical bearing arrangements. the working surface of the reel roll has been machined and / or modified as necessary.

111927 g

Figure 3 illustrates in principle the use of a uniform, deflection compensated nip roll D for controlling the winding of the sub rollers R1-R5. Adjustment of the longitudinal curvature profile of the nip roll can be accomplished using hydrostatic, hydraulic or other power means and roller structures known per se.

Figure 4 illustrates the control of the warping of the partial webs using a separate adjustable nip roll (D1-D5) for each of the rolls R1-R5. It should be noted that the invention is not limited, as shown in Figure 4, to an embodiment in which each sub-web and corresponding sub-roll has its own nip roll, but that the number of nip rolls can also be selected such that one nip roll adjusts the winding of two or more adjacent sub webs.

In the examples shown in Figures 1 to 4, the cutting into partial webs and the winding of these partial webs onto a reel spool are accomplished such that the webs / rolls are of the same width, and the spacing of the reels corresponding to the partial webs on the reel roll is the same. However, the invention is not limited to this embodiment alone, but both the number and width of the sub-webs / rolls, and also the spacing of the sub-rolls on the reel roll, may be varied as required in Figures 1-4. The invention is still not limited to an embodiment in which all the sub-webs / rolls are of the same width, but a full-width paper web can also be cut so that the sub-webs have two or more different widths, and these partial webs can be further wound onto a reel reel so that the spacing of the resulting sub rolls is, if necessary, of different sizes.

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It is also possible that the longitudinal section (C in Fig. 1) and subsequent

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In connection with the distribution and control of the scrap webs (S in Figure 1), the paper web part (s), preferably of poor quality, is guided: · [to the side, and the paper web separated for that part (s) is not rolled onto the reel reel R. is naturally also possible by simply removing a portion of paper 35 of suitable width between the sub-webs to be rolled into sub-rolls without: /.) having to change the direction of the sub-webs separately using the spreading and guiding means (S).

10 111927

The invention is not limited to use at a particular point in the papermaking process, although longitudinal sectioning is preferred, and subsequent partial web rewinding to adjacent reels on a reel reel is already the first, on-line type continuous process reeling. However, if the paper web to be processed does not at any later stage of the off-line processing exhibit features which complicate the winding of the full-width web and / or exacerbate the drawback of the spool roll, the method and apparatus of the invention may be used only. after finishing the next reel. Such a post-treatment post-treatment step may be, for example, coating the paper web, as a result of which the air permeability of the web is reduced.

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Claims (18)

111927 A method for winding a paper web, in which a continuous paper web (W) of paper machine 5 and / or paper finishing nature is rolled in successive machine rolls into a single reusable end-supported reel core. around the reel roll (R), characterized in that, during this winding, a substantially full-width paper web is first cut by longitudinal sections of the web into two or more sub-webs (W1-W5) of identical width or width, which are then rolled R) on separate sub-rolls (R1-R5) which form the machine roll and are the machine roll can be unrolled for further processing or further use. 15 Method according to Claim 1, characterized in that, in addition to the end bracket, the reel reel used for winding the reel is supported at one or more points between the sub rollers (IB1, IB2) formed on the reel roll to prevent the reel roll from bending and / or vibrating. Method according to claim 1 or 2, characterized in that:. that the winding of the partial webs on the reel spool is separately controlled by using two or more separate nip rolls (D1-D5), either * · * 25 each individual web and the respective roll having its own nip roll, or by adjusting two or more single nip rolls; ; 'Of the towed section web. Method according to Claim 1 or 2, characterized in that the winding of the partial webs on the reel reel is separately controlled by using one full-width deflection compensated nip roll (D, Fig. J: f 3). r * A method according to any one of the preceding claims, characterized in that, when the reel roll is replaced, when the rolls reach their desired maximum size, the longitudinal cutting into partial webs is interrupted at all or at least some of the partial webs (W1-W5) 111927. a new reel reel has started. 6. A method according to any one of the preceding claims, characterized in that the paper web which is wound onto the reel roll and which at the same time forms part webs, becomes a web. continuous rewinding directly from a paper machine. Method according to one of the preceding claims 1 to 5, characterized in that the paper web to be wound on a reel roll and at the same time interleaved into partial webs becomes a paper web. from post-processing equipment connected to a paper machine on-line for winding. Method according to one of the preceding claims 1 to 5, characterized in that the paper web to be wound onto a reel spool and at the same time interleaved into partial webs becomes the paper web in question. winding from an off-line post-treatment apparatus after one or more previous winding and unwinding of a substantially full-width web. 20 A method according to any one of the preceding claims, characterized in that the width of the webs (W1-W5) to be wound on the reel roll is substantially selected to correspond directly to the customer's horizontal. . requirements. 25 hrs · 10. A paper web reel, in which a continuous paper web (W) from a paper machine and / or paper finishing machine is rolled »* * in a sequential machine reel into a single reusable end-reel core. around the reel roll (R), f · ': characterized in that it comprises a cutting member (s) (C) disposed at different locations in the transverse direction of the paper web, second members for feeding the web through the cutting member (s) to cut the web in longitudinal cuts. ·· split or divergent webs (W1-W5), a dispensing and guiding apparatus (S), which further has means for guiding the partial webs into separate rolls (R1-R5), and one (D) or more (D1-D5) a nipple yarn arranged to guide the partial webs (W1-W5) into a machine roll 111927 for an end-supported reel roll (R), from which the machine rolls are still the respective rolls. machine reel can be rolled off for further processing or reuse. A reel winder according to claim 10, characterized in that, in addition to its end support, the reel reel used for reeling has one or more support members (IB1, IB2) disposed between the partial webs to prevent the reel reel from bending and / or vibrating. 10 A retractor according to claim 11, characterized in that the support of the reel roll at the point of loading between the support member and the rotating reel roll is provided by a bearing having a wide contact surface and / or using gas or liquid as a medium. 15 A reel winder according to any one of claims 10 to 12, characterized in that it comprises two or more individually adjustable nip rolls (D1-D5) for adjusting the roll of the partial webs, either so that each sub-web (W1-W5) and the respective roll (R1- R5) has its own nip roll, or such that one nip roll is provided for two or more adjacent partial webs. * · · A roller reel according to any one of claims 10 to 12, characterized in that the roll of the partial webs (W1-W5) is adjustable; ··. For this purpose, it comprises one full-width, deflection compensated nip roll. (D, Figure 3). i i I »· A retractor according to any one of the preceding claims 10 to 14, characterized in that the apparatus comprises two separate sets of cutting elements / pairs of cutting elements required for length cutting, of which the first cutting set is longitudinally operable to pre-adjust the second cutting set. ···. and, when carrying out the reel roll, the longitudinal sectioning by the first set of six rolls can be interrupted, and after the paper 35 web is inserted into the new roll, the second set of sections can immediately resume longitudinal cutting without the lateral adjustment of the paper web. A roller roller according to one of the preceding claims 10 to 15, characterized in that it is connected directly to the back of the paper machine. A reel reel as claimed in any one of claims 10 to 15, characterized in that it is connected to a post-processing equipment connected on-line to a paper machine. 10 The reel winder according to any one of claims 10 to 15, characterized in that it is connected to the aftertreatment device of the off-line type. 15> · *> · * · · # ♦ I '' • • • • »» '1 »• I * t t» »Ί11927