FI120443B - Method in connection with a reel of a fiber web machine - Google Patents

Description

The invention relates to a method according to the preamble of claim 1.

It is known in the art to use fasteners for fiber web machines, such as paper and board machines, in which a fiber web made on fiber web machines, such as a paper-10 machine / board machine, is rolled into a in the winding nip or utilizing the center drive, in which case also the winding shaft is provided with drive. In the retractors, when the machine roll is completed, a change is made to start the reeling of the new machine roll and to remove the finished machine reel from the rewinder. In the changeover process, the web is cut off, whereby one end of the web goes into the finished machine roll and the other end is guided around the winding axis to start the winding of the new machine roll. The so-called traditional exchange methods include, for example, goose-neck, bag-blowing, tape-20, water-cutting and side-blowing. Also known in the art is the so-called OptiReel exchange method described, for example, in patent FI 91383.

One problem with the prior art reel winder exchange has been the presence of loose web pieces and its passage into the winding nip and the new machine roll formed, which has been prevented by, for example, blowing, but has failed to eliminate the problem since the broken web has not been blown. means that the loose web pieces remain floating in the air space above the 30 nip and in addition, the loose web pieces also come from the finished roll in smaller pieces. Loose pieces of web 2 entering the roll reduce the roll quality, cause loss of production and are therefore particularly problematic.

Further problems are caused by the clapping, i.e., that the tuft of the machine roll, i.e. the end of the web on the surface of the roll pin 5, detaches pieces of fibrous web, i.e. feed, when the tail strikes the presser while braking the machine roll. A particularly harmful problem arises if pieces of fibrous web fly with the air currents caused by the surface of the machine roll inside the machine roll at the beginning of the new winding. The pieces of fibrous web inside the machine roll pose a risk of latching on the roller after a few minutes and may even damage the calendar rolls during calendering when caught in the calendering nip between the calendar rolls.

The occurrence of web chunks as described above in connection with winding is thus often referred to in the art as feed and loose web chunks formed as feed. 15 Primary feed refers to webbing / loose webs that occur primarily during or after interruption of the exchange, mainly due to exchange blows or the like. Secondary feed refers to a web chop which flies to the surface of a finished reel that is still rotating in the secondary after changing due to e.g. flattening of the tail of the web and breakage of its surface. Some major amounts of the present invention are mainly related to solving the problems caused by the secondary feed.

One problem with the reel replacement process has been that after the change, the surface layers of the finished machine reel loosen when the machine reel is braked and after the stop is removed from its position against the reel. Loosening of the surface layers causes surface wrinkling, and at worst, with high speeds of over 1500 m / s m / min, with on-line machines, especially when rolling slippery fiber web types such as LWC and CWF, the surface wreck can be up to 1000 meters.

In conventional conventional continuous roll loans known in the art, there was generally no need to bond the roll surface immediately after changing the roll, especially if the driving speed was low and the material to be rolled was air permeable and had high fiber coil layers. If, prior to winding, charge is formed on the web to be rolled, due to static electricity, the adhesion between the layers is improved and the surface layers of the roll are retained on the finished machine roll. The charge event occurs especially when winding dry fibrous web. The charge may also be intentionally generated by means of separate apparatus for bonding the surface layers to the finished roll. A problem in which the surface layers of the web roll are retained in the finished roll through a large charge is that the high charge may interfere with working, for example sampling near the machine, as the charge may be discharged by personnel to machine frames or buildings in an unpleasant or hazardous manner.

Also known in the art is a method of holding the surface layers on the finished machine roll by means of a printing device, such as a brush or roll, which presses the surface of the machine roll during replacement and stopping of the machine roll, the nip formed between the finished machine roll and the brush in place. One disadvantage of these known solutions is the cost caused by the printing device, for example a brush or roll, the marking of the web and the space required by the devices. In addition, at high travel speeds, the web tail is further struck by the weight on each revolution, causing small pieces of the web tail that cause the problems described above and increasing the need for cleaning and thus staying in the reel area during travel, which poses a safety risk. In addition, the need for cleaning increases the need for compressed air.

Arrangements have also been known in the art which have been applied, for example, in the manufacture of coated fiber webs and in which water-based solutions have been developed to secure the surface layers of the finished machine roll to improve the adhesion between the surface layers. In these known solutions, water is sprayed between the surface layers 4 through feed pipes or the like. However, such solutions have proved problematic because the water layers do not bind sufficiently tightly, whereby the roller surface layers have become loose.

Also known in the art are solutions based on the action of various surface-binding agents, such as adhesives, for improving adhesion between surface layers. In prior art arrangements, a suitable amount of surfactant is sprayed on a case-by-case basis for the material to be rolled in a position relative to the finished roll and winding nip so that the surfactant is effective, that is, after spraying the binder. In prior art solutions, the apparatus used in such cases is a surface dressing feed tube (s) having one or more nozzles, depending on the location of the apparatus. In these prior art arrangements, ongeimal-15 has proven to be capable of accumulating and drying on the nozzles of the feed tube causing them to become clogged.

The object of the invention is to eliminate or at least minimize the problems and drawbacks of the prior art solutions described above.

20

It is an object of the invention to provide a method in connection with a fixed spreader of a fiber web machine in which the surface layers of the finished machine roll cannot be loosened during braking and stopping.

It is an object of the invention to provide a method in connection with a fixed web winder of a fiber web machine which does not exhibit detachable loose web pieces during the changeover operation and in which problems caused in particular by secondary feed can be eliminated or at least minimized.

5

In order to achieve the foregoing and further objects, the method according to the invention is essentially characterized in what is stated in the characterizing part of claim 1. At least one double sided tape and at least one double-sided adhesive tape on one side of the web roll or web on the web or on the roll roll between the press roll and the web or the roll of the web side.

In accordance with preferred embodiments of the invention, the tape (s) is / are affixed to the web or web to be rolled onto the web or web to be rolled onto on the roll surface by tensioning the nip or web, causing the tape to release from the surface of the winding chuck or the like and adhering to the web tail / web surface, whereby one adhesive surface of the double-sided tape (s) adheres to surface layer (s) to prevent their loosening and / or securing the web tail to the web reel during braking and machine roll stop.

In connection with the invention, the tape (s) may be affixed to the surface of the rewinding sheet before changing, either manually or by using a taping device. The tape can also be grasped by the gripping device at its ends and moved over the web and dropped onto the web, whereby the tape is carried along with the web and glued to the web and machine 6 in a roll nip. According to a further embodiment, when patchy tapes are used, the tapes can be applied to the surface of the web via compressed air blowing.

The tape (s) is / are positioned longitudinally, transversely, or spirally on the surface of the winding shaft. The tape (s) may / may be located at one or more locations along its width and length.

The tape may also be provided with a release liner, the opening of which, for example by blowing, can be used to schedule the tape to hit the desired 10 position on the tail of the web. For example, in the case of a water cutting change in which the web is cut from the center to the edges with tails resembling tails on each transverse edge of the web, the opening may be timed so that the tapes strike the tails. When using a tape with a shield, the shield is preferably coupled to the tape so that the shield, due to the adhesive, pivots away from the tape but not completely detached from it, is guided to the machine roll so that the shield does not fly loose.

The adhesion of the tape used in connection with the invention to the web must be greater than its adhesion to the surface of the winding shaft. This can be accomplished by selecting the adhesive 20 or by making the surface of the winding shaft such that the adhesion of the tape to the surface of the winding shaft is smaller than the adhesion of the tape to the web, for example by glossy tape or The surface of the winding shaft may also be made suitable by grinding or polishing adhesion or other similar treatment that reduces the adhesive force.

The double-sided tape used in connection with the invention may also be such that the adhesion on the surface adhering to the surface of the winding shaft is less than that on the first adhesive side of the web, such that surface 30 on the winding shaft has sufficient adhesion to adhere to The tape adheres releasably to the surface of the winding shaft and permanently to the web and machine roll. However, the adhesion of the tape 7 must be sufficient so that the tape does not come off the surface of the winding shaft before it engages in the web, for example due to air currents occurring when the winding shaft rotates. The adhesive strength of the tape (peel adhesion 180 ° Tesa test method up to 002) is preferably greater than 0 N / cm 2 but less than 2 N / cm 2, for 5 seconds, at most 0.5 to 1.5 N / cm 2.

According to a preferred embodiment of the invention, in the application of double-sided tape, the winding shaft is brought into contact with the web by closing the primary nip prior to replacement, wherein the tape (s) on the surface of the winding shaft come into contact with the web. the reel shaft. The double-sided tape enters the machine roll with the web and passes through the nip of the reel drum or printing roller under the first surface layer of the machine roll to bind the surface of the machine roll.

According to a further advantageous feature of the invention, timing is used in connection with the application of tape, for example, by delaying the moment of change, the amount of web that enters the surface of the machine roll on the tape / tape 20 can be adjusted.

According to a further advantageous feature of the invention, the tape is pulpable, which makes it possible to disassemble the surface layers of the machine roll. One such is, for example, a self-sealing tape used with unwinders. For example, a packing tape is suitable as an adhesive tape on the surface of the reel shaft.

According to one embodiment of the invention, one or more separate applications are made, i.e., in the roll production step, the tapes are applied in different stages of time, allowing the surface of the roll to be bonded and the layer required for sampling to be left underneath and full-width tail followed by water tail frake tails.

The advantage of securing the rolls of the machine roll to the machine roll according to the invention is, inter alia, that the double-sided tape binds the surface layers securely so that the surface of the machine roll is not loosened during or after braking of the finished machine roll. , whereby it does not come off the surface during braking and thus does not strike any possible printing device, thereby avoiding, or at least minimizing, the problem of flapping.

According to the invention, when the web tail is fixed to the roll of the machine roll with adhesive tape, the surface layers are effectively adhered to the surface of the roll of machine, allowing up to 15 braking of the finished machine roll without printing, resulting in significant cost savings.

In the practice of the invention, in accordance with the additional features of water cutting in reel winders, the tapes are affixed such that one tape takes care of securing the tail of the web to the finished machine reel, and preferably tapes securing the so-called frake tails of Then, after the nip closes, the first tape passes with the web to the machine reel, and the additional tapes provided at the timing release from the winding shaft and engage the frake tails, attaching them to the surface of the machine reel.

In the practice of the invention, in accordance with the additional advantageous features of goose roll replacement in reel wrappers, the tape (s) is / are applied to the surface of the roller shaft in a spiraling manner from the center to the edge. Cut-off of the rib-30 nan is performed by a knife or similar cutting means that strikes the spiral tip at a point where a spiral extending from the tip to the edges controls the tearing of the tail neck into a wedge. The spiral tape then engages with the web on the surface of the machine reel and binds the end of the web, i.e. the tail, and thus acts as a means for binding the surface layers of the machine reel, reducing secondary feed generation and machine roll unwinding. If necessary, an additional tape can be provided in the center to lift the tip of the end of the web. The tape may also be a two-piece tape which is distributed in the center, one part picking up the tongue and the other tearing off the tail and guiding it to the machine roll, binding the roll surface layers.

The invention can also be applied to the replacement of downstream replacement blowing tubes or a full-water water speed grater, for example, in an OptiRccl type reel, in which the female changeover roll is withdrawn from the reeling cylinder. The tape (s) then adhere to the web via the web tension or the printing nip.

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

Figure I schematically illustrates a machine-roll reel arrangement of an embodiment of the invention.

Figure 2 illustrates an embodiment of the invention in which the tape is disposed longitudinally of the winding axis.

Fig. 3 schematically shows an embodiment of the invention in which the tapes are disposed transversely to the winding axis.

Figures 4A-4B schematically illustrate the application of the invention in connection with a water cutting exchange.

30 10

Figures 5A-5B schematically illustrate the application of the invention in connection with a replacement blade.

Fig. 6 schematically illustrates the application of the invention in a nip open exchange 5.

Fig. 7 schematically illustrates the application of the invention in the context of a goose replacement.

Fig. 8 schematically illustrates some embodiments of the invention.

Fig. 9 schematically shows another embodiment of the invention.

Unless otherwise stated, the same reference numerals are used throughout the figures and in the description thereof.

In the arrangement of Fig. 1, a web 11, i.e. a machine reel 11, is about to be completed around a winding shaft 10, and a new winding shaft 12 has been moved to a standby position with the reels SI and S2 to make the next web reel. 11 the direction of rotation and the direction of rotation of the winding cylinder 13 and with the arrow SW the direction of travel of the web W. According to a preferred embodiment of the invention, double-sided tape / double-sided tapes 20 are affixed to the surface of the new winding shaft 12 introduced into the standby station before being moved to the surface of the winding shaft 12 manually or by using tape tape. From the surface of the winding shaft 12, the tape (s) adhere to the surface of the web W guided to the finished machine reel 11 and the other side of the tape / tapes in the reel nip between the reeling cylinder 13 and the finished machine reel 11. after that, the finished machine roll 11 is braked and stopped to transfer it to further processing. According to a further advantageous feature of the invention, the surface of the new winding shaft 12 may have additional tape (s) which engage the web W timed so that it is located on a portion of the web W guided to the new winding shaft 12.

5

Figure 2 shows an embodiment of the invention in which the tape 20 is disposed longitudinally on the surface of the winding shaft 12. The tape 20 is double-sided and has an adhesion such that its adhesion to the winding shaft 12 is less than that of the web. In the embodiment shown in Fig. 2, bottom tapes 21 are used on the surface of the winding shaft, 10 under the tape 20, to provide adhesion of the tape 20 to the side of the winding shaft, smaller than that of the web W.

Fig. 3 schematically shows an embodiment of the invention in which the tapes 20 are disposed transversely to the winding shaft 12. Also in the 15 embodiment shown in this figure, there are bottom tapes 21 under the tapes 20.

Figures 4A-4B schematically illustrate the application of the invention in a water cutting change, wherein the tapes 20 are attached such that one tape 20A takes care of securing the tail of web W to a finished machine roll, one tape 20B pulls 20 to the tip of web W and is preferably added tapes 20C, which fix the so-called "frake tails F" created in water cutting to the surface of the finished machine roll. In this case, after the nip closure, the first tape 20A passes with the web W to the machine reel and, for example, blowing directs the tip W of the web W with the second tape 20B to the new winding shaft 12 and similarly blowing machine roll surface.

Figures 5A-5B schematically illustrate the application of the invention in connection with a replacement cutter blade. In Figures 5A-5B, the cut-off line C is marked on the web W by a cut-off point C made with a cutting blade known per se to cut off the web W. In accordance with the invention, a double-sided tape / double-sided tapes 20 are applied to the finished roll of the web W, which adheres to the surface of the finished machine roll of the web W, bonding the surface layers of the machine roll. Figure 5A shows two tapes affixed to the tail of web W and one tape 20 extending to the female transverse width of web W in Figure 5B.

Fig. 6 schematically illustrates the application of the invention in a nip open change in which a web reel 11, i.e. a machine reel 11, is about to be completed around the winding axis 10 and a new web station 10 is connected to the reeling cylinder 13 the scroll axis 12. The arrows SI and S2 indicate the direction of rotation of the machine roll 11 and the direction of rotation of the cylinder 13 and the direction of web travel with the arrow SW. In connection with the completed machine roll 11, there is a printing roller 14 for pressing the surface layers during braking and stopping. According to a preferred embodiment of the invention, a double-sided tape (s) 20 is affixed to the surface of the new winding shaft 12 brought to the standby station before it is moved to the standby station by adhesive tape on the end of the web W to the surface of the machine roll 11, whereby the surface layers of the machine roll 11 become bonded and cannot loosen when the finished machine roll 11 is braked and stopped after being cut off by the web W for transfer to further processing. When applying the arrangement of the invention, the use of a printing roll 14 can be dispensed with, whereby the tape 20 adheres to the surface of the machine roll 11 of the web W under the influence of the web tension T 25 prevailing. On the other hand, according to one embodiment of the invention, the tape 20 may be gripped on the machine roll via a press roll 14 as shown in the figure as an alternative tape application D. In this embodiment, the press roll 14 is secured similarly to the winding shaft 12 described above; position where it forms a printing nip with machine roll 11.

13

Fig. 7 schematically illustrates the application of the invention in the context of a goose neck replacement, in which the tape (s) 20 are disposed on the surface of the winding shaft 12 in a spiral-like manner, extending from the center to the edge. The web is cut with a knife 25 or similar cutting means that strikes the spiral tip at a point where a spiral extending from 5 tips to the edges controls tearing the goose neck into a wedge. The spiral tape then engages with the web on the surface of the machine roll and binds the end of the web, i.e. the tail, thereby acting as a means for binding the surface layers of the machine roll, reducing secondary feed generation and loosening of the machine roll surface layers. If necessary, an additional tape 22 may be inserted in the center to raise the tip of the web end 10. The tape can also be a two-piece tape that is split in the middle, one part picking up the tip and the other coming off the tail and guiding it to the machine roll, binding the roll surface layers.

According to alternative embodiments A, B, C shown in Figure 8, the tape / tape 15 may also be secured in similar ways to the above described applications on a separate tape applicator roll 19B, e.g., on a roller shaft 13 or a roller shaft 12 19B, or in a press roll 19A located on a winding cylinder 13, from whose surface the tape (s) 20 are adhered to the web 20 guided to the machine roll 11. These applications are particularly advantageous in situations where the nip between the new winding shaft 12 and the winding cylinder 13 is open.

According to the embodiment shown in Fig. 9, tape 20 can be moved between the web W and the surface of the machine roll 11 via a winding nip, whereby the tape is moved near the nip 25 with a gripper (not shown) dropping over the web, arrow S20 blows and engages the web and machine reel in the winding nip.

The invention has been described above primarily with respect to such winders in which the winding nip is formed between the winding cylinder and the forming roll. The method 14 according to the invention is also applicable to rollers in which, for example, a support fabric passes over a winding cylinder via a milling nip, e.g. between a winding cylinder and a forming roll, such as described in, e.g., Fl patent 94231. The invention is also applicable the winding nip shape-5 is inserted between the support fabric, e.g., the belt and the forming roll, such as that described in, for example, FI patent application 970610.

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

Claims (12)

1. A method in connection with the changeover event in a wheelchair in a fiber web machine, which method is applied in carrying out shifting in the roll-up of the web (W) Mn a web roll (11) which is completed into a new web roll for rolling up the following roll around a rolling shaft (12), characterized in that for attaching one or more surface layers of the web roller (11) to the web roller (11) that is finished, the method is adhered to the web (W) which is led to the web roller (11) which becomes father you have at least one double-sided tape (20) with one side thereof and said tape (20) is adhered by the action of a press roll nip between the web roll (11) and a press roll (14) or the web tension (T) at the surface of the web roll (11) which becomes finished or in the method, at least one double-sided tape (20) is adhered to the surface of the web roller (11) with one side thereof and said tape (20) is adhered by the action of a rolling nip between a rolling cylinder (13) and the web roller (11) or press roller nip m between the web roller (11) and a press roller (14) or the web tension (T) at the surface of the web (W) which is wound on the web roller (11) which is finished, with its other side. 2. A method according to claim 1, characterized in that at least one double-sided tape (20) in the method is fixed before the shift on the rolling shaft 25 (12) of the web roller which is next wound up, from which axis it is attached to the web (W) which leads to the web roller ( 11) that gets done. Method according to claim 1, characterized in that at least one double-sided tape (20) in the method is fixed to a tape application roller (19B) arranged before the rolling cylinder, from which it is attached to the web (W) guided to the web roll (11). that gets done. 4. A method according to claim 1, characterized in that a double-sided tape (20) in the method is fastened to a pressing device (19A) arranged in conjunction with the rolling cylinders (13), from which it is attached to the tap (W) which is led to the the web roller (11) being completed. 5 5. A method according to claim 1, characterized in that a two-sided tape (20) in the method is fastened to a pressing roller (14) in connection with the web roller (11), from which it is fixed to the surface of the web roller (11). that gets done. 10 Method according to claim 1, characterized in that at least one double-sided tape (20) in the method is brought to the vicinity of the rolling nip and secured between the web (W) so as to lead to the web roll which is completed and the surface of the web roll (11) which is completed by mediation of the scroll nip. 15 Method according to any of the preceding claims, characterized in that in the process the adhesion between the surface of the rolling shaft (12) or the pressing roller (14,19A) or the second application roller (19B) and the tape (20) is chosen less than the adhesion between the web (W) and the tape (20). 20 Method according to any of the preceding claims, characterized in that a double-sided tape (20) is used in the process, the adhesion to the web (W) being 0-10 N / cm 2, preferably 0.5-1.5 N / cm2. . 25 Method according to any of the preceding claims, characterized in that in the method at least one double-sided tape (20) is placed in such a way that it is attached to the web extending over a substantially transverse width of the web relative to the running direction of the web. 30 Method according to any of the preceding claims, characterized in that, in the method, at least one double-sided tape (20) is placed in such a way that it is attached to the web extending over a substantial length of the web in the running direction of the web. Method according to any of the preceding claims, characterized in that in the method at least one double-sided tape (20) is placed in such a way that it is attached to the web extending obliquely in relation to the running direction of the web. Method according to any of the preceding claims, characterized in that the method is used in connection with water-schematic exchange carried out in the wheelchair with at least two double-sided tapes (20A, 20C), that the tapes are attached in such a manner that at least one tape (20) fastens the tail of web (W) at the web roll that is finished, and that at least one tape (20C) fastens the "'coat skirts" (F) that occur at the water cut at the surface of web web that is finished.