FI119634B - Method in a continuously operating machine for unwinding a fiber web, in particular a paper or cardboard web, and a continuously operating unwinding machine for a fiber web, in particular a paper or cardboard web - Google Patents

Description

The method comprises a continuous web unwinding of a fibrous web, in particular a paper or cardboard web, and a continuous web unwinding of a fibrous web, in particular paper or board web. en pappers- eller cardboard bana 10

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

The invention also relates to an unroller according to the preamble of claim 10 for carrying out the method.

Off-machine coating machines use a continuous unrolling roller, whereby a new machine roll brought to the open roller is connected to the tail of a dropping machine roll at full speed. A double sided adhesive tape is prepared at the end of the web of the new machine roll by means of which the end of the web is fixed to the surface of the roll. The surface speed of the new machine roll is accelerated as closely as possible to that of the machine, after which the web of the deflated machine roll is pressed against the aforementioned seam on the roll. The old web is cut off with the blade on the seam side. The sealing device 25 consists of a sealing roll and a subsequent track guide roll and actuators for moving said rolls. Continuous release roller sealing devices nowadays generally use a sealing roller, which usually has a thick soft rubber or the like surface. The core material of the sealing roller is generally steel, but may also be of other material such as carbon fiber. The length of the sealing nip in the machine direction between the machine roll 30 and the rubberized sealing roll is of the order of about 40 mm. At present, the line loading of a sealing roller is generally about 2500-8000 N / m.

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One drawback with the unwinders at current speeds (1200 - 1900 m / min), and especially when rolling thick species, may be the so-called sequence constraint, i.e. when using two rewind positions, primary and secondary, the primary generator will not accelerate and accelerate the bottom of the roll is rolled to the end. The sequence constraint thus limits the capacity of the coating machine following the unwinding station, since speed must be limited. The sequence constraint also results in an increase in the diameter of the web roll to be lifted from the primary to the secondary in the lifting arms and in the other structures, thereby increasing the space requirement and the manufacturing cost of the unwinder.

Controlling the unraveling tail and the paper shred from the bottom of the seamed roller is challenging and will occasionally cause a seam break or at least require air blows to prevent it from going into the paper sheave nip.

A change in the track length at the seaming event causes a change in the line tension as the seaming roll moves against the machine roll. The track length generally increases, causing the track tension to increase and the track tension to change away from the optimum 20 tension value for the seam. In addition, a sudden increase in rail tension increases the risk of rail breakage.

It is also a disadvantage that when the machine roll to be welded has a carrot-like diameter profile, the sealing roll cannot adapt to it, which reduces the adhesion of the seal and increases the risk of sealing failure.

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It is an object of the invention to provide improvements to a continuous open roller.

It is an object of the invention to provide a method in connection with a continuous unwinding roller and a continuous unwinding roller which avoids or at least substantially prevents the disadvantages and problems caused by the prior art solutions.

One particular object of the invention is to provide a method in connection with a continuous unroller 5 and a continuous unroller without sequence restriction.

It is a further specific object of the invention to provide a method in connection with a continuous unwinding roller and a continuous unwinding roller in which the problems caused by the ejection tail and the loose paper sheave of the bottom 10 rolls are eliminated or at least minimized.

In order to achieve the foregoing and further objects, the method according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

The unwinding device according to the invention for carrying out the method is in turn characterized by what is stated in the characterizing part of claim 10.

In the unroller according to a preferred embodiment of the invention, the movement of the old or unrolled machine roll and the new, i.e. next unrollable machine roll is substantially horizontal and both the new machine roll and the old machine roll movement are arranged linearly on for controlling tension 25, and which machine roll can be retrieved from the previous storage / seam preparation station, if necessary, which shortens the seam sequence, allowing seam thicker web at a higher speed. Since the acceleration of the machine roll is done during the movement of the wagon, there is no sequence restriction. As unfolding progresses, the roller is changed from one pair of carriages to another having a secondary brake generator 30, or alternatively, the secondary drive generator is fixedly in place, whereby the secondary carriages are locked before replacement and sealing.

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Another pair of carriages move the bottom of the roll to the seam position. Thus, the invention also allows for optimum dimensioning of the unroller drives and gearbox, since the rotation range of both the primary and secondary wagons is advantageous. Especially with large roller diameters, the trolley's travel distances remain 5, which means that there are several suitable options for the propulsion system, such as a hydraulic cylinder and a screw.

The invention also enables the control and minimization of the tension throw of the web in unrolling as the sealing roll moves, by synchronizing the motion of the bottom 10 of the sealable roll with the movement of the sealing roll. Advantageously, this can be accomplished by arranging the movement of the seam roller and the bottom of the roll in substantially parallel directions, whereby the travel distances are the same and control is easier to accomplish. The motion of the sealing roller and the bottom of the roller can also be effected by the articulated joint design principle, mechanical or guided synchronization. It is also possible to minimize the tension throw of the web by providing a web guiding means movable in synchrony with the motion of the seam roller, for example a web guide roll which is disposed between the seam roller and the secondary brake generator.

According to a further advantageous feature of the invention, a cutter and protection device are combined in the opener, thereby cutting off the web and at the same time preventing the shred of paper from entering the sealing nip. In this embodiment of the invention, cutting of the web is accomplished by means of a cutting blade connected to a protective device descending from above, whereby the advantage of the upper cutting is that the cutting device presses the tail sealing roll and reduces the annealing. In addition, a shielding device can be integrated into the cutting device.

According to another advantageous feature of the invention, in the opener, the web cutting device is disposed such that the web is cut from the underside of the web and, if necessary, depending on the web type and the speed of the machine, the protective device is positioned above. Hereby, the advantage of the cut-off from below is that the positioning of the cut-off device is easier and the required travel distance is smaller than that of the cut-off above.

In connection with the invention, the carriage-like machine roll diameter 5 can be sealed by positioning the primary carriages to ensure a uniform closure of the sealing nip, for example, in a position and / or force adjustment manner known per se.

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.

Figures IA-1C schematically show an operating sequence of the method of the invention.

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Figures 2A-2C schematically show some layout applications of the unwinding roller according to the invention.

Figures 3A-3D schematically illustrate some web tension management applications of the method of the invention.

Figures 4A-4D schematically illustrate, in a preferred embodiment of the method according to the invention, the positions and movements of the primary and secondary unwinding carriages and primary and secondary brake generators during an operating sequence.

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Fig. 5 schematically illustrates an embodiment of the invention when welding a '' carrot-like '' machine roll.

In the figures, the web to be rolled is denoted by reference W, the sealing roll by reference numeral 12, the track guide roll by the sealing device by reference number 11, and the new machine roll to unroll after seam is designated 6 by 13 and the old machine W is the cutter blade of the cutting machine designated by reference numeral 15. In the seaming, the old web is brought near the surface of the new machine roll 13 and the web is pressed onto the surface of the machine roll 13 by a sealing roller 12.

The protective device 16 prevents the paper shred from entering the nip between the sealing roll 12 and the new machine roll 13, i.e. the sealing nip, when sealing. The sealing device thus comprises, in addition to the sealing roll 12, at least one other roll 11 which is an auxiliary roll and at the same time a web guiding roll. In the figures, arrows S10, S12, S13, S16 are indicated by the respective direction of movement of the part / device designated by the corresponding reference numeral.

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In the situation shown in Fig. 1A, the web W is rolled from an old, i.e. unloading, machine roll 10, and through the web guide roll 11, the web W is guided to a subsequent processing step, for example a coating machine (not shown). The new or next roll-up machine reel 13 is being moved towards the primary position of the unwinder as indicated by arrow S13 and at the same time the old machine reel 10 is being moved from the primary position to the secondary station as indicated by arrow S10. As can be seen from the figure, the movement directions S10, S13 of both the old and the new machine roll are substantially horizontal or linear. The sealing roller 12 is in the waiting position.

In the situation of Figure IB, the new machine reel 13 is in the primary position and the old machine reel 10 is in the secondary position. Unwinding is still performed on the old machine roll 10. Seam roll 12 is being moved as indicated by arrow S12 to the workstation, which position as well as the corresponding web path W are dotted for sealing. The cutting blade 15 is also being moved to the work station for cutting.

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In the situation of Figure 1C, the nip between the seal roller 12 and the new machine roll 13 is closed, the sealing tapes are introduced and the web W from the old machine roll 10 is cut off by a cutting blade 15, i.e. sealing is performed on the web from the new machine roll 13. The old machine roll 10 in the secondary station is braked and the nip between the seam roll 12 and the new machine roll 13 is opened and the seam roll 12 and cutting blade 15 are moved to the waiting position.

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In the situation of Fig. ID, the unwinding takes place from a new machine roll 13 from the primary station and the web W is guided through the track guide roll 11 to the next processing step of the web. The winding axis of the old machine roll 10, i.e. the reel roll, is moved away from the 5 secondary stations.

Figures 2A-2C schematically illustrate various layout alternatives in the method step of Figure 1C above.

In the embodiments shown in Figures 2A-2C, the unwinding roller also comprises a protective device 16 which prevents paper shards, etc., from entering the sealing nip during sealing.

In the embodiments of Figures 2A-2B, the shielding device 16 is used as needed, with the web type being rolled and / or the speed of the machine being such that chopping is likely to occur during seaming. The shielding device 16 is positioned above the unwinding roller and, if necessary, is lowered to the workstation during seaming and moved back to the waiting position after seaming, as indicated by arrow S16. In the embodiment shown in Fig. 2C, the shielding device 16 is coupled to a shear device 15, so that it provides protection for the sealing nip at all times during sealing. The protective device 16 and 20 cut-off device 15 move together as indicated by arrow S16,15.

The embodiment of Figure 2A comprises a web guiding member 17, such as a roller, roll bar, curved damper or the like, which moves with the cutting device 15. The web is cut by a cutting device 15 below the web. The web guiding member 17 controls the passage of the web W during cutting so that it is cut as close as possible to the sealing nip so that the web W after it is short is short. As shown in the figure, the web guide member 17 is used to raise the passage of the web W so that the web passage is folded over the portion between the secondary station and the sealing roll.

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In the embodiment of Fig. 2B, the entry of the web W between the secondary station and the sealing roll 12 is substantially straight and the passage of the web is controlled by the sealing roll 12. Cutting is performed from below the web W by a cutting device 15.

In the embodiment of Fig. 2C, the entry of the web W between the secondary station and the sealing roll 12 is substantially straight and the passage of the web is guided by the sealing roll 12. Above the web W is cut by a cutter 15. The cutter 15 and guard 16 are interconnected , 15 as shown.

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Figures 3A-3A schematically illustrate some applications for controlling the web tension between an unloading machine roll and a sealing nip during sealing in the method step of Fig. 1C.

In the embodiment shown in Fig. 3A, the web tension between the discharge machine roll 13 and the sealing nip is controlled during welding so that a secondary generator brake generator coupled to the winding axis of the old, i.e., draining machine roll 10 moves substantially simultaneously with the sealing roll 12. The directions of movement are indicated by arrows S10 and S12. With movements S10, S12 being substantially simultaneous, the web length does not change during seaming between the machine roll 10 and the next holding point, in this figure, the sealing nip between the seal roll and the new machine roll 13. Because the movements S10, S12 occur simultaneously and the track length remains constant, there is no line tension during the seam.

In the embodiment shown in Fig. 3B, the web tension between the old machine roll 10 and the sealing nip is controlled during sealing so that the sealing roll 12 moves to close the sealing nip between the sealing roll 12 and the new machine roll 13 while Simultaneous movement of the sealing roller 12 and the track guide roller 11 can be accomplished by mechanically coupling the sealing roller 12 and the track guide roller 11 to a joint roller. The simultaneous movement of the sealing roller 12 and the track guide roller 11 may also be effected such that both the sealing roller 12 and the track guide roller 11 are independently movable and their movements are interconnected by means of position control.

In the embodiment shown in Fig. 3C, the web tension between the old machine roll 10 and the sau-5 maus nip is controlled during seam such that as the seam roll 12 moves to close the seam nipple 12 and the new machine reel 13 during seaming. Thus, the track guide roll 11 arranged below the sealing roll 12 does not move during sealing. The rib-10 nanocontrol member 17 is disposed below the web W and cutting of the web W is performed from below the web W by a cutting device 15.

In the embodiment shown in Figure 3D, the web tension between the old machine roll 10 and the folding nip is controlled during seam such that as the seam roll 12 moves to close the seam nip between the seam roll 12 and the new machine roll 13, during seaming. Thus, the track guide roll 11 provided below the sealing roll 12 does not move during sealing. The web guiding member 17 is disposed above the web W and the cutting of the web W is performed above the web W by a cutting device 15.

In the situation illustrated in Fig. 4A, the unwinding web 10 is rolled from an old, i.e. unloading, machine roll 10 in a primary position. The secondary carriages move to retrieve the empty roller.

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In the step shown in Fig. 4B, a new or re-unrolled machine reel 13 is being moved from the storage station towards the primary unroller station as indicated by arrow S13. Acceleration of the machine roll 13 to the sealing speed can be started, if necessary, at this stage. At the same time, the old machine roll 10 is moved from the primary station 30 towards the secondary station.

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4C, the new machine reel 13 is in the primary position and the old machine reel 10 is in the secondary position. Unwinding is still done from the old machine roll 10. The sealing roller 12 is being moved to the workstation for sealing. In sealing, the nip between sealing roller 12 and new machine roll 13 is closed, sealing tapes are introduced into the nip, and web W from old machine roll 10 is cut off with a cutting blade, i.e., sealed to web from new machine roll 13. The old machine roll 10 in the secondary station is braked and the nip between the seal roll 12 and the new machine roll 13 is opened and the seal roll 12 and the cutting blade 15 are moved to the waiting position.

In the situation of Fig. 4D, the unwinding takes place on the new machine roll 13 from the primary station and the winding axis of the old machine roll 10, i.e. the reel roll, is moved away from the secondary station.

Fig. 5 schematically illustrates an embodiment of the invention when welding a "pork-15 channel" machine roll, whereby the primary carriages are skewed to ensure a smooth sealing nip. As can be seen from the figure, when the seam roll is placed in the carriages, it can be pivoted relative to the seam roll so that the nip closes evenly despite the carrot-like appearance.

Only some preferred embodiments of the invention have been described above, but the details are not intended to be limited in any way.

Claims (14)

11 A method in a continuous-action unwinding of a fibrous web, in particular a paper or board web, wherein the unwinding machine roll is unwound in a primary and 5 secondary positions, and wherein a new machine roll (13) ), wherein the method comprises moving the old machine reel (10) and the new machine reel (13) in substantially horizontal direction, characterized in that in the method the new machine reel (13) and the old machine reel (10) are moved by two linearly moving carriage pairs a pair having a primary brake generator for controlling the web tension, wherein acceleration of the new machine roll (13) to the unrolling speed is made as the carriage moves towards the primary winding station. Method according to Claim 1, characterized in that in the method the discharging machine roll (10) and the sealing roll (12) move substantially simultaneously during sealing to control the tension between the discharging machine roll (10) and the sealing nip between the sealing roll (12) and the new machine roll (13). 20 Method according to Claim 1, characterized in that, as the sealing roller (12) moves to close the sealing nip between the sealing roller (12) and the new machine roll (13), the web guide roller (11) located below the sealing roller (12) moves 12) and to control the web tension between the sealing nip between the new machine roll (13). Method according to one of Claims 1 to 3, characterized in that, in the process of unwinding, the machine roll is changed from a first carriage to a second carriage having a secondary generator. 12 Method according to one of Claims 1 to 4, characterized in that, in the method, the old machine roll (10) is moved by a second pair of wagons to a seam position. Method according to one of Claims 1 to 5, characterized in that the movement of the old machine roll (10) in synchronization with the movement of the sealing roll (12) is synchronized with the tension of the web to minimize ejection. Method according to one of Claims 1 to 6, characterized in that during sealing, the protective device (16) prevents the passage of the paper shred to the sealing nip between the sealing roll (12) and the new machine roll (13). Method according to one of Claims 1 to 7, characterized in that, in the sealing step, the web (W) is cut from above by a cutting device (15) connected to the protective device (16). Method according to one of Claims 1 to 7, characterized in that, in the sealing step, the web (W) is cut from below with a cutting device (15). Continuous unfolding of a fibrous web, in particular a paper or board web, for carrying out a method according to any one of claims 1 to 9, comprising a primary station and a secondary station and a sealing device having a spool roll (12) and a track guide roll (11) for moving the unloading machine roll (10) and the new machine roll (13) in a substantially horizontal direction, characterized in that the unroll roller further comprises two linearly moving pairs of wagons and each pair of wagons comprises a brake generator. Unroller according to Claim 10, characterized in that the unroller comprises a protective device (16) arranged to prevent the passage of the paper shred into the sealing nip between the spout roll (12) and the new machine roll (13). 13 Unwinder according to Claim 11, characterized in that the unwinding device further comprises a cutting device (15) connected to the protective device (16), in which the web (W) is arranged to be cut off from above the web (W). 5 The unwinding device according to one of claims 10 to 12, characterized in that the unwinding device further comprises a cutting device (15), in which the web (W) is arranged to be cut from below the web (W) during the sealing step. An unroller according to any one of claims 10 to 13, characterized in that the unroller further comprises a track guide (17) for controlling the passage of the web (W) to cut the web close to the seam roll (12). 14,}