FI108123B - A method for unrolling a machine roll and an apparatus for unrolling a machine roll - Google Patents

Description

1 108123

Method for unrolling machine roll and apparatus for unrolling machine roll

The invention relates to a method according to the preamble of claim 1 in unwinding a machine roll.

Machine roll unwinders unload the paper web from the machine roll for off-machine post-treatment of the paper web, which means separate processing from the actual paper web production line. The machine reel consists of a rotating roll of reel 10 and a paper web rolled several meters in width at a previous papermaking or processing stage. The post-treatment where the paper web is unwound from the machine roll in the unroller may be a process in which the paper web surface is finished to produce quality paper, such as coating in a coating machine or calendering in an off-machine calender, or to form customer rolls in the winder.

One unroller is shown e.g. in Finnish Patent 100323, which is equivalent to US Patent 5,709,355.

In off-machine paper handling, the paper web is guided from a roller machine roller at a high speed (15-50 m / s) to 25 post-processing equipment, except for possible stops and creep speeds required by the processing process. Even if you don't, Sat-! ' in support, this means that at normal running speeds, the paper web is ejected from the machine roll in an uncontrolled manner because the large machine roll cannot be stopped quickly. With the masses of Ko-30 reels (now several tens of tons) and their diameters increasing, especially if the web break occurs when the machine reel is relatively full, the stopping takes a disproportionately long time relative to the paper web unloading speed. In addition, the large amount of paper coming in a short time cannot be directed to the pulper, but is delivered to the post-processing equipment near the unwinding roller. In this way, a large amount of paper web accumulates in undesirable locations within a short period of time, causing a fire hazard and, at best, a long-lasting cleaning of the paper web hardware. Calculations show that even with a processing speed of 15m / s, a width of 8m and a weight of 60 g / m2, the discharge web accumulates in excess of 100 kg / min, even if the roll can be braked. Even such large quantities must be cleaned up manually. Another disadvantage is the loss of finished paper, as uncontrolled paper has to be driven to the wreck.

It is an object of the invention to eliminate the above drawbacks and in particular to provide a method and apparatus which can be used in all unwinding machines for dismounting machine rolls formed from a full width web and which is particularly useful for achieving larger machine roll sizes. To accomplish this purpose, the method of the invention is essentially characterized by what is set forth in the characterizing part of claim 1 of the appended claims.

The invention is based on tensioning an elongated element against the surface layer of the machine roll, which binds the paper web to be discharged from the roll to the roll. Such an elongated element can be fastened very quickly in the event of a malfunction to the surface of the machine roll, for example by pressing it rapidly on the surface of the roll, whereby a rotating roll rotates the tape around the rotating ends of the winding core. The element thus stays approximately transversely to the longitudinal direction of the web on its circumferential surface along its entire le-25 water and passes with the rotating circumference of the roll while, for example, the reel-off element wraps around the ends of the reel roll. When, for example, a web break has occurred and a roll-binding elongate member is positioned on the roll surface, the roll can be stopped in a controlled manner since the web being discharged from the roll is no longer a problem and moderate braking forces can be applied to save stops. In addition, the roller was not damaged during controlled stopping. In addition, prior to the action of the element, the unwound web rolls back around the roll into a kind of "loose" tail, and at best, there is not much paper to be cleaned.

35

In preparation for the new threading in the post-treatment equipment, the element is cut and disassembled from the reels of the reel.

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The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 is a perspective view of the apparatus in a resting position, Figure 2 shows the apparatus of Figure 1 after operation, and Figure 3 is a cross-sectional view of the element feeder.

10

Fig. 1 illustrates an unwinding apparatus in which a machine roll R of a full-width web is rotated in the direction of rotation indicated by the arrow while supporting a rotating reel roll 1 forming a roll core at the bearing housings at its ends on the unroll rolls 2. The spool roll 1 is then connected at one end to a rotating drive (not shown). The web W is discharged in the direction indicated by the arrow to the post-processing equipment, which may be an intermediate roller, whereby the discharged paper web is re-rolled to machine reel with suitable winding parameters and eliminates any malfunctions, spreading a coating paste, or a winder, in which the finished paper is cut into narrower sub-webs and the sub-webs are rolled into desired rolls smaller than the machine roll. All of these functions are characterized by the fact that, with the exception of any mandatory stops and creep speed runs, the paper web to be discharged runs most of the time at a constant processing speed, usually at least 15 m / s and generally between 15 and 50 m / s. Processing speeds may be other than those described above, and in particular, it can be assumed that in the future, the above-mentioned upper limit will be exceeded.

Fig. 1 shows a guide 3 transverse to the discharge direction of the web, which acts as a feeder 35 for the elongated flexible element 4 and can be a trough of a suitable cross-section or the like. The elongated element 4 fed to this guide 3 is a flexible elongated element made of a suitable material, such as a ribbon, braid or the like. The location of the element 4 in the conductor 3 is shown in cross-section in Fig. 3. The element 4 is a flat ribbon, and the open side of the C-shaped conductor is narrower than the width of the ribbon to retain the element in the conductor. The edges of the open side may be made of a flexible material that facilitates the strip coming out of the guide 3.

5 The element need not necessarily be a flat strip in cross-section, but may also be of oval or circular cross-section. Preferably, the element 4 is made of a pulp-based pulpable material, i.e. is a sufficiently strong paper strip, paper rope or the like. The element 10 may also be a plastic material.

The element 4 is fed from the main reel 5, which is located in the second unwinding bracket 2, through a guide 3 to an auxiliary reel 6 at the other end of the roll, where it is collected in a suitable amount. Also, the auxiliary reel 6 is secured to the unwinding stand 2 at this end of the roll. The guide is U-shaped as close as possible to the peripheral surface and edges of the full roll of paper. Between the reels 5, 6 and the guide 3, in the width direction between the bearing housing of the reel roll 1 and the side edge of the paper roll, i.e. at the rotating neck of the Tam reel 1 at each end 20, the element 4 is free and which is an actuator jerking against a tight paper roll peripheral surface. Figure 1 illustrates a situation in which a flexible elongated element 4 is fed from a main coil 5 along a conductor 3 in communication with the auxiliary coil 6 on which it is wound by rotating auxiliary coil 6. The element 4 must be sufficiently rigid to be pushed along the wire to the auxiliary coil. If necessary, the guide may be provided with supporting elements for transporting the element, such as air jets, or mechanical conveying means. The securing devices 7 are in standby positions outside the edges of the paper roll on machine roll R 30.

The conductor 3 is disposed so that the web run is located between it and the peripheral surface of the roll, so that the element 4, when moving to the periphery of the roll, is able to pull loosely from the roll to the roll surface.

35 The guide may be located behind the web release point, e.g. in a position where it is placed downwards and the web is rolled upwardly to unroll the web.

The guide 3 is shown in Fig. 1 on the side of the unwinding device on which the web W is discharged, in front of the unwinding brackets 2, which is easily accessible. However, the conductor 3 may also be located at another point where it is convenient for operation. It is usually advantageous to place it close to the floor so that it can be fixed to the floor, for example.

5

Fig. 2 illustrates a situation in which the fastening devices 7 at each end of the roll have jerked the element 4 closer to the axis of rotation, whereby the element comes out of the guide 3 and tightens against the circumferential surface of the rotating roll. While the element 4 is centrally clamped over the peripheral surface of the paper roll, pressing the top paper layer firmly against the lower, thereby preventing the web from unwinding, being dragged by the high rotational speed rotating roll, resulting in additional element 4 rotating on the paper roll edge extending around the neck of the spool reel 1 between the edge of the paper roll and the bearing housing. As the element 3 is tensioned against the surface of the roll, the already discharged web W collects back on the top layer bound by the element to form a loose "tail." The element 3 is discharged from the main reel 5 and a for example, the resistance of the main spool 5 to rotation increases after a certain number of turns, the element running from the spool around the neck of the reel tightens, and the strap breaks due to tensile stress or against one of the suitably positioned steel edges. A special cut-off device may be provided in connection with the main coil 5.

The element 3 attaches to the paper roll substantially axially 30, i.e. transverse to the longitudinal direction of the web W. The position may not be exactly parallel to the axis of rotation of the reel roll, but the element may also run obliquely from edge to edge, depending on where it is attached to the surface of the roll, and this depends e.g. the position of the coils 5,6 and the fastening devices 7.

35

Once the paper web has been secured to the roll by means of element 3, the rotational movement of the roll can be stopped at an appropriate time without the need to aim for the shortest braking times, which may stress the base of the reel or the roller structures and brakes.

The clamping means 7 may be pressure medium driven actuators for rapid movement, and the movement of the part striking and moving the element may be effected in linear motion according to the movement of the actuator, or may be a pivotal movement through a coupled lever of the linear motion actuator. The clamping device 7 can in principle be any actuator which causes movement. It is possible that only the other edge of the paper roll 10 requires a fastening device which moves the element 4 sufficiently tight against the peripheral surface of the paper roll, after which the element 4 is also pulled off the reel around the neck of the spool roll by rotational motion.

The invention is not limited to the above embodiment, but may be modified within the scope of the inventive idea set forth in the claims. The invention encompasses all apparatuses in which an element 4 transverse to the direction of travel of the web can be brought into contact with the surface of the roll and brought into contact with the surface of the roll. The clamping function can be integrated, e.g., in coils, whereby element moving members capable of acting on element 4 from the coil can be provided. In principle, it is possible to move only one coil or both by actively rotating in the opposite direction to the discharge direction. that between them the shrinking element 4 hits the surface of the roll, but this requires that the coils be rapidly released to free release rotation as the element 4 departs from the rotating roll.

30

The guide 3 may be stationary in position or be movable, for example it may move radially towards the axis of rotation of the roll as the roll gradually decreases, i.e. "follow" the surface of the roll. In a wide U-shaped conductor this function can be implemented e.g.

35 by arranging the radial arms of the conductor to be telescopic or otherwise shortened, and by means of the coils 5,6 the element 4 can always be kept sufficiently tight.

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Further, it is possible to arrange the operation of the apparatus to be automatic so that the automatic monitoring of the web break becomes an action command when a web break is detected if the regulating means of the fastening devices controlling their operation are connected through the au-5 thematic control system of the finishing equipment.

In the case of a head failure following a web break, the element is fed from the main reel 5 along the conductor 3 to the auxiliary coil 6, and when the post-treatment apparatus is operational again, the apparatus is tuned ready for the next strip break.

In addition, the invention can be used whether the paper web is unloaded from below or above the roll, since the element binds the paper roll regardless of the direction of rotation of the roll.

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Claims (19)

A method of unrolling a machine roll, wherein a paper web (W) is unwound from a paper reel for finishing paper, characterized in that the paper web (W) unwound from the paper roll is interfered with, for example, in web breakage, by means of an elongate element (4) which is tensioned against the surface layer of the paper roll. Method according to claim 1, characterized in that the elongate element (4) is tensioned against the surface of the roll in such a way that it substantially crosses the longitudinal direction of the web (W) between the outer edges of the paper roll. Method according to claim 2, characterized in that the elongate element (4) extending over the paper roll is fixed to the surface of a rolling core rotating around the outer axis of the roll about the rolling axis of the roll, such as the hoist of a tambour roller (1). 4. A method according to claim 3, characterized in that the elongate element (4) is gathered around one end extending beyond the outer edges of the paper roll from the roll of the roll core, such as the hoist of a tambour roller (1), several rounds when rotating the roll. on the surface of the roller the tensioning element (4) moves with the rotational movement of the roller. 25 5. A method according to claim 4, characterized in that the elongate element (4) is unwound around a rolling core from bearings, such as coils (5, 6). Method according to claim 5, characterized in that the elongated element (4) is unwound about a rolling core from bearings, such as coils (5, 6) under tension. Method according to any of the preceding claims, characterized in that the elongate element (4) is measured with a guide (3) located substantially opposite the longitudinal direction of the web (W) in the vicinity of the rotating paper roll and transmitted from this guide ( 3) against the surface of the roller. • «12 108123 Method according to any of the preceding claims, characterized in that the finishing of the paper barrier is coating, calendering, rolling or longitudinal cutting. 5 9. A method according to any of the preceding claims, characterized in that the element (4) is transferred to the surface of the paper roll with an automatic function in path cutting. Apparatus for a roll-off machine of a machine roll, characterized in that it comprises a transverse elongate element (4) with respect to the direction of roll-off (W) and a fastener (7) of the element arranged to transmit the element. (4) in contact with a rotary machine roller (R) present on the roll-off machine against a paper roll present in this circuit surface. 15 11. Apparatus according to claim 10, characterized in that the movement path of the fastener (7) is arranged to transfer with its movement the element (4) closer to the rolling core, such as the tambour roll (1) of the machine roller. 12. Apparatus according to claim 11, characterized in that the path of movement of the fastener (7) is arranged to direct the rolling core protruding from the edge of the paper roll from the edge of the paper roll, such as the tambour roll (1), of a machine roll present in the roll-off machine. 25 Apparatus according to claim 11 or 12, characterized in that the number of fasteners (7) is two, one on both sides of the paper roll. Apparatus according to claims 10-13, characterized in that it comprises a guide (3), such as a groove, which is arranged to guide the elongated element (4) to a functional non-positional position. Ϊ Apparatus according to claims 10-14, characterized in that the elongate element (4) forms a bearing, such as a coil (5), at the other end of the machine roll. 16. Apparatus according to claim 15, characterized in that it comprises an auxiliary bearing located at the opposite end of the machine roll, such as an auxiliary coil (6) arranged to receive the elongate element (4) supplied from the bearing. 17. Apparatus according to claim 16, characterized in that bearings, such as the coil (5) and the auxiliary coil (6) are arranged to freely lower the elongated element (4) in a certain tensile voltage at least in a certain amount, to collect the element ( 4) around the end of the roll reel core, such as the tambour roller. Apparatus according to any one of claims 15 to 17, characterized in that the path of movement of the fastener (7) for transferring the element (4) is arranged between a bearing, such as a coil (5), and the edge of the paper roll which is located. closest to this one. 19. Apparatus according to claims 10-18, characterized in that it is placed in connection with the unwinding machine of a coating machine, a caiander, an intermediate roller or a longitudinal cutter.