FI119981B - Method and apparatus for patching fibrous material - Google Patents

Description

The invention relates to a method for patching a fibrous web according to the preamble of claim 1.

The invention also relates to a device for patching a fibrous web according to the preamble of claim 11.

10

It is known in the art that webs made with fiber web machines, such as paper and board machines, may have holes that need to be patched before causing problems with further processing or at least before the customer rolls formed from the web are delivered to the customer. As is known in the art, 15 holes are usually patched manually with patch tape, either by transferring the path to the creep loop or by stopping the path before patching. As a result, the holes are usually patched off-line, for example with a spacer, which is one of the main uses of a spacer, with a calender or a winder. Because the hole patching is performed either at crawl rate or when the device 20 is stopped, the hole patching significantly reduces the throughput / capacity of the device in question, especially if there are many holes, easily becoming a bottleneck in the entire production line.

JP 4354760 discloses a method and apparatus for repairing a web. The Jul-25 slide features an automatic hole-punching device for an intermediate roller that automatically recognizes hole locations and automatically fixes patches over holes. Once the hole has been identified, the unwinding speed of the web is slowed down and the passage of the hole is further observed and the hole is patched at creep speed.

EP 0922139 discloses an automatic fault / hole detection arrangement which also allows patching directly on a paper or 2 coating machine. In the arrangement, the patching is done with spray adhesive, roller application, for example, using a fast setting adhesive. The disadvantage of such an arrangement is contamination and clogging of the glue nozzles as the glue dries into the nozzle.

DE patent publication 102005023396 discloses a method and apparatus for automatic patching of a paper web. The device comprises a tracking device for detecting holes in the web and a patching station following the tracking device.

The patching station has a patch tape applicator comprising a first actuated first roll with a ci adhesive conveyor belt on its surface. The conveyor belt is rotatable by moving the first roll into contact with an applicator roll below it. The conveyor belt is gripped with web-wide positioning tapes which can be transferred from the conveyor belt to an applicator roll which the web wraps around a given sector. When the detection device detects a hole in the web, it gives 15 control commands to the patch station so that the first roll is rotated so that the patch tape adheres either directly to the web or the applicator roll and then to the web in the rotation sector between the applicator roll and the web.

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

It is an object of the invention to provide a patching method and apparatus by which a hole patch can also be automatically performed at a high creep speed; at a faster pace.

25

In order to achieve the foregoing and further objects, the process according to the invention is essentially characterized by what is stated 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 11.

(3

According to the invention, the method and the device for patching the web onto the web comprise at least one adhesive tape applied through an applicator roll. A counter roll is provided on one side of the web relative to the applicator roll to form a patch nip between the patch roll of the patch tape and its counter roll, which patch can be opened and closed according to the patch need by moving at least one roll from a position in contact with the web. The patch tape is applied to the appliquing roll of the patch tape by the applicator. The patch tape can also be manually applied to the applicator roll. In tape application, the patch tape is brought into contact with the web by closing the patch nip, whereby the tape (s) on the surface of the patch roll contacts the web and adheres the tape (s) out of the nip and detaches from the surface of the applicator roll.

The applicator roll used in connection with the invention is movable from the web / attached to the web / counter roll / back roll, whereby the roll can be stopped when not in contact with the web for the application of tape / roll cleaning.

According to the invention at least one of the patching nip roll is a patching tape applicator 20 kointitela but the invention also encompasses embodiments in which the upper and lower repair track is arranged to take place at the same station, or in the same online-kausnipissä, preferably wherein the patching nip, each roller is provided with a tape <applicator. The tape can also be manually applied to either or both rolls.

25

According to the invention, the application of the hole fixation tape in the direction of travel of the web is performed on the basis of the hole transverse position (CD) position information, the size information and the web speed provided by the fault detector preceding the patch position.

The invention is suitable for use in web finishing steps, preferably in connection with web winding, for example in connection with a winder for a fiber web machine, wherein at least one tape is used to fix the web to be applied to the web.

The invention is preferably applicable to the treatment of the web prior to winding 5 by a machine reel by which the fibrous web produced on a paper conveyor / reeling machine is wound as a full-width web for further processing. The rail is wound around a winding shaft, for example, a reel iron / roll, either through surface water in a winding nip of a winding cylinder and a formed web roll, or in a center drive, wherein the winding shaft is also provided with drive. According to a preferred embodiment of the invention, the tape is attached by means of a tape applicator to a separate tape applicator roll located in front of the reel reel barrel of the reel, from which the tape is adhered to the finished web roll. The patch tape is applied in the transverse direction to the correct position, either by moving the transverse taper device to the correct position on the applicator roll, whereby the applicator and counter rolls of the 15 patch tape can be ordinary wire or similar pape! rolls used in fabrication or narrower (slightly wider than patch tape) transversely movable rolls, whereby the rolls and patch tape are moved to the hole to be patched. When repairing heavy types of fibrous webs, it is also possible to grip the tape through the web tension by imposing sufficient coverage of the web 20 over the applicator roll.

The tape (s) is / are positioned longitudinally, transversely or spirally on the surface of the tape applicator roll and may / may be located in one or more locations on the strip | depending on the shape, size and number of holes. The length of the Tei-25 pin and thus the cut-off point of the applicator is adjusted according to the size of the hole.

The tape may also have a release liner, which is removed to the side, for example, by suction or blasting during patching. When performing 30 low speed patching, a protective coating layer is not necessarily required, but the tape application should always be timed to close the patch nip, which requires high accuracy and / or slow web speed.

The outward side of the patch tape used in connection with the invention must not be sticky, so that the tape does not adhere to other rolls during passage of the web, or when rolled to the next layer, the surface / coating of the applicator roll should be such that it may be a double-sided tape or the roll may be provided with a suction or similar adhesion. Alternatively, one layer of tape may be added to the tape, whereby the lowest 10 protective tape will be stuck in the applicator roll and the roll will need to be cleaned.

Ί

The adhesive tape applied to the web to be used in connection with the invention must be larger than the adhesion between it and the tape provided on the surface of the patch roll.

This can be accomplished by selecting an adhesive.

15

However, the adhesive tape used in connection with the invention must be sufficiently adhesive to prevent the tape from loosening from the surface of the patch roll before it adheres to the web.

The adhesive force of the tape (peel adhesion 180 ° Tesa test method up to 002) on the web is preferably greater than 0 N / cm 2 but less than 2 N / cm 2, most preferably 0.5-1.5 N / cm 2.

According to a further advantageous feature of the invention, the tape is pulpable, which makes it possible to wreck the machine roll. One such is, for example, a self-sealing tape used with unwinders. For example, a wrapping tape is suitable as a possible tape to be applied to the surface of the 25 rollers.

The invention provides considerable advantages. When applying the method of the invention, the hole sealing can also be performed automatically at a higher speed than the creep speed. The automatic 30-hole patching through the invention accelerates hole patching and thus improves line production. 1

In addition, the amount of manual work is reduced, since the tape reel 6 of the applicator does not need to be changed much less frequently than it would have been necessary to fix the holes manually. In addition, the need for an intermediate roller is substantially reduced, resulting in cost savings. In some concepts, the entire spacer may be dispensed with.

5

The invention is feasible in connection with the modernization of both new fiber web machines and old fiber web machines.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawing 10, however, the details of which are not intended to be narrowly limited.

Fig. 1 schematically shows a hole patching arrangement according to an embodiment of the invention applied in conjunction with a retractor.

15

Fig. 2 schematically shows a tape structure on the surface of an applicator roll used in connection with the invention.

Figure 3 shows various alternatives for applying patch tape to the surface of the appli-20 assembly roll.

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

In the arrangement of Figure 1, a web roll 11, or machine roll 11, is about to be completed around a winding axis 10. The winding cylinder is denoted by reference numeral 13. Arrows S1 and S2 indicate the direction of rotation of machine roll 11 and winding cylinder 13 and arrow SW. The web W is guided to the winding cylinder 13 via a guide roll 14. The web patching device 30 20 is disposed on the passage of the web W before the guide roll 14. A web perforating device 30 is provided adjacent the web W and located in front of the patching device 20.

7

The patching device 20 comprises a tape applicator apparatus 21, a patch tape applicator roll 22 and a counter roll 23. The patch tape applicator roll 22 and the counter roll 23 form a patch nip with the patch roll 22 being moved against the patch roll 23, the web W passing therebetween. The applicator roll 22 5 can be moved from its rest position (position shown in the figure) to the patch position, i.e. I · against the counter roll 23 as indicated by arrow S22. Once the detection device 30 has detected the roll / holes in the web, it transmits information about the size and location of the hole (s) to the tape applicator 21. The tape applicator 21 comprises a tape roll from which a desired amount of patch tape is applied to the desired position on the applicator roll 22.

When the hole (s) arrive at the patching device 20, the applicator roll 22 is moved to the patch position, i.e., the patch nip is closed and as the web W passes the patch nip, the patch tapes move from the applicator roll 22 to the web W at the hole / holes. i ".. 1 The applicator roll 22 is then moved back to its rest position with the adhesive applicator for the tape to wait for the next patch.

15

The patch tape is applied in the transverse direction to the correct position either by moving the transverse tape applicator 21 to the correct position on the applicator roll 22 or by using conventional wire or the like in the papermaking rolls , 23 and the patch tape are moved to the hole to be patched. , j

In the embodiment shown in Fig. 1, a hole insertion on one side of web W is illustrated. In the figure, the hole sealing tape is transferred to the web from below, but the invention also encompasses applications in which the sealing tape 1 is transferred to the web from above, whereupon the counter roll 23 is naturally below the web and the applicator roll and tape applicator. According to the invention! the hole patching can also be accomplished for both webs W, each roll 22, 23 serving as an applicator roll and a separate tape applicator 21 being provided at each roll 30, regardless of the application.

8

Referring to Fig. 2, a patch tape 31 is adhered to the surface 22A of the applicator roll 22 by an adhesive tape applicator 21. The surface 22A of the applicator roll 22 has an adhesive such that the patch tape 31 is removably adhesive thereto on a pin 5B having no adhesive. adhesion of the patch tape 31 to the web of adhesive surface 31A. For example, the surface of the applicator roll may have a double-sided adhesive tape adhered on one side to the surface 22A of the applicator roll 22 and another surface to adhere the patch tape 31. The surface 22A of the applicator roll 22 may also be provided in other ways such that the patch tape 31 can be fitted with suction. The surface 31A facing the web W of the patch tape 31 is adhesive and the surface 3IB facing away from the web W is non-adhesive.

If necessary, a protective tape 32 may be provided on the surface 31A facing the web W of the patch tape 31 to prevent the patch tape 31 from sticking before patching.

15 The protective tape 32 is removed from the surface 31A of the patch tape 31 before patching, for example by suction or blasting to a position 32 '.

Figure 3 shows various alternatives for applying patch tape 31 to the surface 22A of the applicator roll 22. The sealing tapes 31 are provided with a protective tape 32, which is lowered.

On the side 20 of the patch roller 22, there are patch tapes 31 which are positioned at positions corresponding to the size and shape of the holes detected. The tape (s) 31 are disposed longitudinally, transversely or helically on the surface of the tape application roll 22 and may be located at one or more locations in the transverse direction of the web, depending on the shape, size and number of holes.

25

The invention has been described above in Fig. 1 in connection with a reel in which a reel nip is formed between the reel cylinder and the reel formed. The method according to the invention is also applicable to such winders in which, for example, a support fabric passes over a winding cylinder through a winding nip, e.g. a belt, between a winding cylinder 30 and a forming roll. The invention is also applicable to such winders in which the winding nip is formed between the support fabric, e.g., a belt and a forming permit roll. The invention is also applicable at another suitable point in the handling of the web prior to its longitudinal cutting and winding into customer rolls.

The invention has been described above with reference only to some of its preferred embodiments, the details of which, however, are not intended to be narrowly limited.

'f h1 -i

Claims (18)

A method for patching a fiber web, in which method the fiber web (W) is observed with a detecting device (30) for detecting shark in the fiber web, at least one patch tape (31) fixed releasably on an application roller (22) with an applicator device (21) or by hand when the detecting device (30) detects a shark in the fiber web (W), said at least one patch tape (31) fixed from the application roller (22) on the fiber web (W) at the heel of the fiber web (W) at a contact location between the application roller (22) and the fiber web (W), characterized in that a counter roll (23) is arranged against the application roller (22) in such a way that a patch nip is formed between the application roller (22) and the counter roll (23). one patch tape (31) is attached to the fiber web (W) from the application roller (22). 15 A method according to claim 1, characterized in that the patching of the fiber web (W) is carried out at a greater speed than creep speed, the speed of the fiber web (W) being at least 40 m / min, advantageously at least 100 m / min. Method according to claim 1 or 2, characterized in that said at least one patch tape (31) is attached to the surface of the application roller (22) at the correct location on the basis of position and size data regarding the heel mediated by the detection device (30) and the velocity of the fiber web (W) by moving the applicator (21) relative to the applicator roller (22). 25 Method according to any of claims 1-3, characterized in that the application roller (22) is moved in the transverse direction of the web (W) in such a way that said at least one patch tape (31) is fastened to the correct position on the fiber web (W). basis of position and size data regarding the heel mediated by the detection device (30) and the velocity of the fiber web (W). 30 Method according to any of claims 1-4, characterized in that said at least one patch tape (31) of the correct size and shape is applied to the surface of the application roller (22) with the application device (21) on the basis of position, shape and size data. regarding the heel mediated by the detection device 5 (30). Method according to any one of claims 1-5, characterized in that the application roller (22) is moved from a rest position in which it is from the fiber web (W) and the counter roll (23) and in which said at least one patch tape (31) is attached. thereto with the application device (21), into a patch position, in which it stays in contact with the fiber web (W) and forms the patch nip with the counter roll (23), and back. Method according to any one of claims 1-6, characterized in that the eating means has two patch tapes (31) attached to the fiber web (W) at the heel, one on each side of the tap, wherein the patch nip is formed by two application rolls (22). the counter roll (23) being the second application roll, each roller being provided with its own application device (21). 20 Method according to any of claims 1-7, characterized in that the adhesion between the surface of the application roll (22) and said at least one patch tape (31) is selected less than the adhesion between the fiber web (W) and said at least one patch tape (31). . 25 Method according to any of claims 1-8, characterized in that double-sided tape is used on the surface of the application roller (22) for attaching said at least one patch tape (31). Method according to any one of claims 1-9, characterized in that, as said at least one patch tape (31) is used with protective tape (32), wherein the protective tape (32) is removed from the surface of said at least one patch tape (31). overlap. Apparatus for patching a fiber web, said device (20) comprising a detection device (30) for detecting slippage in the fiber web (W), an application roller (22) for applying at least one patch tape (31) to the fiber web ( W) and an application device (21) for applying said at least one patch tape (31) to the application roller (22), characterized in that the device (20) further comprises a counter-roller (23) to the application roller (22), the application roller (22) and the counter roll (23) form a patch nip in which said at least one patch tape (31) is attached to the fiber web (W) prior to the application roller (22), Device according to claim 11, characterized in that the application roller (22) is moved lean between a rest position, in which said at least one patch tape (31) is arranged to be attached to the surface (22A) with the application device (21), and a lapping position, in which it forms the lapping nip with the counter roll (23), for attaching said at least one lapping tape (31) to the heel of the fiber web (W). Device according to claim 11 or 12, characterized in that the application roller (22) can be moved transversely of the fiber web (W) in such a way that said at least one patch tape (31) can be fixed in the correct position on the fiber web (W). basis of position and size data regarding the heel mediated by the detection device (30) and the velocity of the fiber web (W). 25 Device according to any of claims 11-13, characterized in that the application device (21) can be moved in the transverse direction of the fiber web (W) in such a way that said at least one patch tape (31) can be fixed in the correct position on the application roller (22). on the basis of position and size data regarding the heel 30 mediated by the detection device (30) and the velocity of the fiber web (W). Device according to any one of claims 11 to 14, characterized in that the counter roll (23) forms a second application roll, a second application device is arranged in conjunction with the will, at least two patch tapes (31) can be fastened to the fiber web ( W) at the heel, one on each side of the fiber web (W). 5 Device according to any one of claims 11-15, characterized in that the adhesion between the surface of the application roller (22) and said at least one patch tape (31) is less than the adhesion between the fiber web (W) and said at least one patch tape ( 31). 10 Device according to any of claims 11-16, characterized in that two-sided tape is arranged on the surface of the application roller (22), on which said at least one patch tape (31) adheres. Apparatus according to any one of claims 11-17, characterized in that said at least one patch tape (31) is a tape provided with protective tape (32), which protective tape (32) can be removed from the surface of said at least one patch tape (31) before the patch with the aid of a suction / blow device arranged in connection with the device (20). 20 25