FI107444B - Method an device relating to a coil support - Google Patents

Description

1 107444

Method and device associated with the rewinder

The invention relates to a method according to the preamble of claim 1 in connection with a rewinder. The invention also relates to a device 5 in connection with a rewinder of the type shown in the preamble of claim 11.

A continuous feed roller rolls a continuous paper web from a paper machine or paper finishing machine, usually several meters to about 10 meters, into a machine reel. To accomplish the winding continuously, there is an intermittent roll change in which, when the previous machine reel is full, the web passage is directed to a new reel forming the core of the next machine reel.

When the web to be rolled in the winding station is completely filled, the web is cut by some suitable method, for example, depending on the surface weight of the web, and a new end of the web following the cutting point is guided around a new empty reel. There are many patents and patent applications for this or part of this exchange sequence. Applicant's Finnish Patent 95683, corresponding to International Publication WO 93/34495 and US Patent 5,779,183, discloses a printing device for preventing air from entering the web under the web. The Applicant's Finnish Patent Application 915432, corresponding to US Patent 5,360,179, discloses different ways of cutting the web in connection with a roll change. Applicant's Finnish Patent 97339, corresponding to European Patent Application Publication No. 739695, and U.S. Patent No. 5,765,462 discloses a web cutting tool.

Applicant's Finnish Patent 100590 further discloses a way to cut the web with a full-width punching blade and blow the new end of the web 30 by air blowing onto an empty reel reel.

It is known to transfer the aforementioned printing device, with the contact member being a brush or roller, to a load contact with the surface of the roll, substantially to the underside of the roll, in the final roll, and the printing device is transported in load contact with the full roll when moving the roll. Known ballasts have been successful in preventing air from entering the roll and consequently loosening the surface layers of the machine roll.

2,107,444

However, there is a problem, especially with travel speeds rising above 25 m / s, the behavior of the "tail" which remains at the top of the machine reel after cutting off. When the web is broken and passes through the circumference of the finished machine roll during braking, despite the adhesive action of the air resistor 5, it tends to detach from the roll surface during rotation. According to the observations made on the matter, the situation is particularly bad if a long wedge is formed in the exchange, i.e. the web is cut obliquely in the transverse direction. This is particularly pronounced in mid-goose neck changes, where long tails are left at the ends of the web 10 of the often-finished machine roll.

When faced with the printing device, it is released from the surface of the roll and bumps into the printing device, causing a strong jerk in the paper, thereby tearing off the pieces of paper. The pieces may migrate to the new roll nip ai-15, causing problems later in the process. In addition, the resulting shredder is visually undesirable and causes additional cleaning work for the driver. In a slip-type printing machine, the paper shredder can also be narrowed between the printing machine and the roller, causing further problems. If a roller is used as a printing device, the roll should be very large in diameter to smoothly rotate into the nip formed by the printing device and to prevent tearing. This limits the design of the printing equipment.

It is an object of the present invention to provide a method in a roller assembly which can overcome to a great extent the above-mentioned drawbacks of the known solutions and thus improve the state of the art. It is an object of the invention to provide a method particularly used in connection with a printing device, which, however, can also be used on rollers without a printing device. To accomplish this object, the method of the invention is essentially characterized in what is set forth in the characterizing part of the appended claim 1. The device according to the invention, in turn, is characterized by what is stated in the characterizing part of the appended claim 11. The circumferential-35 blowing directed against the direction of rotation of the roll provides for a well controlled tail of the machine roll.

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Other features of the invention will be apparent from the appended dependent claims and the description which follows.

The invention will be described in more detail in the following description with reference to the drawings in which Figure 1 illustrates a situation in which the method is applied to a paper web reel, Figure 2 illustrates a side view of the reel, Figures 3 and 4 illustrate another embodiment of the Figure 6 shows other possible blows as a side view of the reel.

Figure 1 shows a paper roll reel known per se in which the method and apparatus are used. This is a continuous-action reel that rolls a succession of machine rolls R from a continuous paper web W from a paper machine or paper finishing machine around reel rolls 2. The reel rolls 2 are supported at the ends of the reel by a suitable support structure, such as reel rails. During winding, the co-25 rollers are rotated by their own center drive. Fig. 1 illustrates a situation in which the machine roll R, which has been completed to accomplish roll change, has been removed from the winding cylinder 1 by winding trolleys connected to the ends of the reel roll 2 through which the paper web W has come through the winding nip between the roll and cylinder 1. The tapered friction between the incoming web run and the roller ul-30, from which the air tends to penetrate the roll, is indicated by arrow G.

Figure 2 shows a printing device for preventing air from entering through the web G under the web into a roll. In a situation where roller R is about to fill 35, but still in contact with the roller cylinder through the scrolling nip, the printing device 3 is brought into load contact with the surface of the roller R and is moved «k ^ ·. The printing device 3 may comprise a brush, roll or other structure as a contacting member 3a touching and pressing the surface of the roll, and these alternatives, as well as solutions for transferring the printing device to the roll 5, have not been described in more detail. The new Tam drill roll 2 is brought into contact with the web W running on the surface of the reeling cylinder 1 to effect the change.

Figure 2 shows the dashed line W paper passage from the new 10 reel roll 2 to the full machine roll R before cutting. The printing device 3, in which, in the case shown, is a heavy contact member 3a, is moved from a starting position near the reeling cylinder 1 marked with dashed lines to the machine reel R and the roller to a changeover position. , where it guides web W to a roll. The web is cut off at the point marked by arrow C, e.g. with a full-blade cutter or by blasting, after which the new end of the web is guided around the new reel roll 2 and the free end of the web 20 remains in the roll to form a " tail "

Fig. 2 illustrates how blowing in the direction of the peripheral surface of the rotating roll against the direction of rotation of the roll is performed in the area where the end of the truncated web on the roll 25 runs towards the point of contact of the printing device 3 and the roll R. This blowing is achieved by a full-width blowing device 4, which may be a pipe connected to the pneumatic network via a valve, which is disposed in a transverse direction and has nozzles spaced at certain intervals, e.g. holes directed against the direction of rotation of the roll. The blower provides a wide flat air blast front. The nozzles of the blower device 4 are located near the contact member 3a, preferably at an angle of ± 15 ° from the point of contact. The blowing device is preferably mounted on the printing device 3 itself, which moves the contact member 3a in contact with the roll. The blowing device 4 may be mounted on a body supporting the contact member 3a, e.g., behind the contact member 3a from the roll, so as to position the printing device 3 at a distance from the surface of the machine roll R such that strong blasting near the openings 107444 strong roll surface. At the same time, the blower device 4 always remains in a suitable position with respect to the roller R when the body of the printing device 3 supporting the contact member 3a moves along with the roller. The nozzles of the blower device 4 are oriented approximately tangentially to the peripheral surface 5 of the roll so that the air front approaches the roll and meets the roll surface at the smallest angle, preferably perpendicular to the circumferential surface at the point of contact between the contact member 3a and the roll R. The machine roll has a large diameter and a small curvature. Thus, before the contact point of the rollers R of the contacting members 3a and 10, a dynamic bonding pressure can be applied over a long distance, preferably acting at least 90 ° from the point of contact.

On the other hand, the blower device 4 must not be positioned too far from the surface of the roller 15 so that the blowing power is not too low. The nozzles of the blower device are usually closer to the roll R than the new reel roll 2 brought into the change position, and a suitable distance from the roll R is about 20-50 cm.

Figures 3 and 4 show another embodiment. 2 and 2 show two blowing points where the nozzle / nozzles are oriented so that the blowing fronts coming from them approach each other and the roll R. The first blowing points, 4a, are distal to the roll. and is oriented such that the resulting blowing front il-25 meets tangentially in the direction of rotation of the circumferential surface of the roller R than the air blowing front located closer to the second blowing station 4b disposed closer to the roller R. A further blowing point 4a ensures that the web tail H is pressed against the roll and a closer blowing point 4b holds the web in the roll. These blowing devices can also be connected to the printing device 3 to move with it. The closer blow point 4b is also located closer to the contact member 3a. There can be more than two air blows. When there are two or more blows directed against the direction of web rotation, one or more blowing points may be further than 50 cm from the surface of the roller R. However, it is preferred that the nearest blow point is not more than 50 cm from the surface of the roller R.

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The blowing with the devices of the above Figures 2-4 is preferably started as soon as the tail H of the truncated web has entered the roll after cutting and has passed between the contact member 3a and the roll R. In this case, the blowing is immediately performed in an area where the tail H rotates from top to bottom of the next turn towards the contact point between the contact member 3a and the roll. The blow may be synchronized by means of a valve and may be arranged to operate automatically at a specific point in the roll change sequence. The blowing may also be continued for several turns, if necessary, for as long as deemed necessary.

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The blowing device may be a tubular body with holes drilled as blowing nozzles at appropriate intervals. The holes may have a diameter of the order of 2 to 5 mm and may be 100 to 500 mm apart. Instead of the tube, the blower device 4 can be any structure that extends substantially across the entire width of the web, a blower-like blower device having an overpressure connected to its interior and having nozzles facing the direction of rotation of the roll. The nozzles may be wide slot nozzles instead of holes. Figure 2 shows a single tube acting as a blower, Figure 3 showing two tubes acting as a blowing device 20, which may be mounted together on the same support structure, and Figure 4 shows an example of a blower blowing points 4a and 4b. The nozzle structure is oriented substantially tangential to the circumference of the roll R against the direction of rotation of the roll.

As mentioned above, the blowing device can be arranged on the printing device 3. Figure 2 shows an example of how the printing device 3 and the blowing device 30 are moved from the position shown by dashed lines in front of the pulper shield S by linear movement e.g. which is still in nip contact through the winding nip to the winding cylinder 1, after which the roller R, together with the printing device 3, is moved to the position shown in Fig. 2.

The blowing device 4 may be located at points where the blowing from it is directed against the direction of rotation of the roll and causes an air flow to wipe the surface of the roll 7 107444 over a long curved area. It is preferably positioned to blow from the direction of the printing device, and placement in the printing device 3 itself ensures that the blowing device 4 is always in the correct position when starting the blowing. The blowing device 4 can also be attached to the pressing device 3 so that it can be moved relative to the printing device, e.g. the device may be pivotable at the correct position relative to the axis of the roller, e.g. Similarly, the blowing device 4 may be rotatable so that the nozzles are correctly oriented and accordingly the blowing will be at right angles to the roll.

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The location of the printing device 3 itself may be other than the above. Similarly, the blowing device 4 may be a structure independent of the printing device 3, which may be brought into its operating position before the web is cut, for example above the point of contact between the contact member 3a and the roller R. Fig. 5 shows an alternative position of the printing device 3, in which the contacting member 3a of the printing device is located behind the roll R, i.e., on the other side of the lowest point of the roll, in the direction of the web. The blowing device 4 is disposed below the contact member 3a to blow air against the direction of rotation of the roller R approximately tangentially obliquely from below 20. Also in this alternative, the blowing device 4 can be attached to the printing device 3.

The blowing device 4 preferably extends over the entire width of the web. The blowing device can also extend only to a portion of the web width e.g. Blowing may be limited to a specific width at both edges in cases where particularly long portions remain on the roll just at the edges in goose neck replacement or similar replacement methods where the web first ruptures in the middle.

The invention is not limited to cases where a special printing device is used in connection with a roll change. One or more blows directed against the direction of rotation of the web are useful for binding the tail H in all cases, whether or not a printing device is used. However, it is preferable that the blowing comes from a direction 35 in which some force is applied against the circumferential surface of the roller R, either by contact with the mechanical means provided by the contact member 3a.

Jk «. -wu tiki Λ e 107444 or perpendicular to the roll surface by blowing or air pressure. The circumferential blowing obtained by the blowing device 4 hits the surface of the roll sufficiently close to the above impact point, preferably at a distance of less than 60 °, and the blowing action acts on a sufficiently long distance 5 of the roll R prior to said impact point.

The foregoing shows how the free end of web W, i.e. tail H, in the roll R can cause problems and how to remove them by correctly positioned and directed blowing. Fig. 6 shows other air blows which may be used with the aforementioned blower if desired, or also in rollers without blowing against the direction of rotation of the roll. These additional blows control portions of the web that are detached from the web, which can be very variable in size.

The blows are used in a roll change, where the new reel roll 2 is in an al-15 gyratory position in a reversed position, thereby forming a nip N with the winding cylinder 1, and the full machine roll being further away. In Fig. 6, the full roll R in the replacement position from the winding cylinder and at a distance from the new reel roll 2 is marked with an intact line, and the roll taken farther into the stops is indicated by dashed lines.

20

When the web is cut, a different size of loose paper, "feed", may be formed, the passage of which between the new spool roll 2 and the winding drum 1 can ruin the bottom of the new roll. Large pieces can even cause a web break when trapped. The basic idea is to use machine-wide blows at 25 convenient locations to achieve a uniform blowing front as flat as possible with the blowing described above. When the blowing is strong enough, loose-fitting papers start to follow it. By using multiple blows at different points, correctly oriented and timed, it is possible to control the movements of the loose paper 30 in the desired direction, e.g., towards the pulper.

With full power blowing in the direction of the web from the direction of the winding cylinder 1, the feed is moved above the space 5 between the new starting machine roll and the full machine roll R. The blowers are then weakened so that the feed can descend through this space 5 between support structures supporting the ends of the reel roll, e.g., the winding rails. Landing is effected by the flow generated by the full machine roll R rotating.

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Fig. 6 shows a blower device 6, which blows air from the roller R, viewed from behind the roller cylinder 1, approximately horizontally. Closer to the winding cylinder 1 and lower is another device 7, from which air blowing is directed over the starting roller on the winding rails in the starter winder so that the feed cannot reach the nip N between the starting roller and the winding cylinder 1. This blowing line, too, runs approximately horizontally, passing over the reeling cylinder 1 and the starting roller, effectively protecting the nip against N 10 feeds. The upper blowing front goes about 30-50 cm, preferably about 40 cm past the reeling cylinder, and the lower blowing front goes about 5-15 cm, preferably about 10 cm past the reeling cylinder.

The space 5 between the full machine roll R in replacement position and the machine roll 5 starting around the new reel roll 2 has a very good flow throat which leads directly to the pulper P. The blows used are parallel to the machine line and aim to direct the feed to the throat and pulper. They should not unduly weaken or disrupt the air flow to the pulper 20.

The previous blows from the devices 6 and 7 provide good protection of nip N from the small feed. Blowing may also be required to prevent the large flat piece from reaching the nip N. The solution is to position the devices 6 and 7 above the blowing device 8, which is inclined downwardly towards the throat in a direction approximately tangential to the rolling roll. Blowing should not start too early after the web is cut, since the new end of the web must be allowed to ascend unobstructed to the new spool reel 2, but the blowing must be effective as soon as the web end 30 is reached in nipple N.

A fourth blowing device 9 may be located below the throat close to the full machine roll: R, located below a horizontal plane passing through the center axis of the roll, and directed toward the winding cylinder 1 to provide airflow 35 toward the opening 5 of the pulper 5 between the machine roll and the winding cylinder down feeds per pulper opening. For example, the fourth blowing device 9 can be mounted on the printing device 3 to blow back toward the winding cylinder 1. The printing device ίο 107444 3 can also be moved to a suitable position, e.g. after the roller R has been moved from the replacement position. The blowing device 9 may also be positioned at a convenient position behind the roll to blow air under the roll toward the opening of the pulper P. Fig. 3 also shows a baffle plate 10 disposed in the opening of the pulper P 5, which controls the underside of the horizontal blowing from the device 9. The centrifugal force removes the feeds along the stream from the stream at this point and directs them down to the pulper.

The co-operation of the blowing devices 6, 7 and 8 feeds the feed out of proximity to the starting roller nip N and controls the space 5 between the machine roller in the starter and the full machine roller R in the roller, i.e. from the sink to the floor. If the surface layers of the full machine roll are skinned off and pushed into the pulper, the feeds generated by the sharpening process will be carried along, thus eliminating the need for additional cleaning work for the operating personnel.

The blowing action sequence can be the following when cutting the blade: With horizontal blades over the reeling cylinder, the feeds are passed past the coil that starts above the initial winding nip. The blowing power of the blower units 7 and 8 is reduced 1 s after the change. After 5 seconds of replacement, the rear blower 6 blows off. After 12 seconds of change, the holding of the front blower 7 pu-25 completely ceases. Feeding above the full machine roller R is easier to land on the floor between the machine rollers - next to the pulper opening. The blowing of the blower device 8 from above is obliquely downward, with the attenuation turned on for the longest time, for example for about 60 seconds.

The blowing devices 6-9 may be tubes or other suitable structures, e.g. blowing box structures, which are located substantially over the entire width W of the web. Blower operation synchronization with valves: allows to combine the roller with other automation to operate at the correct positions in the replacement sequence. The blowing device 6 can be located 35 so-called. at the front edge of the forage press, the blower device 7 at the rear edge of the forage press and the blower device 8 up at the reel store, for example at the edge of the forage damper.

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Specifically, when using the blower device 4, one or more tongue-engaging blades directed against the rotation direction of the roll, directed in the starting roll and the full roll R at position 5, i.e. between the bottom and up through the narrowest point of the throat by over blowing, the feed can also be rotated through the upper roll of the finished roll R and can be guided down to the other side of the finished roll R. Correspondingly, if the tail tying blower device 4 is down in the position shown in Figure 5, it can be used to replace the blower blower device 9 of Figure 6 alpha 10, which can also be used to direct the feed into the pulper.

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Claims (17)

A method in connection with a paper web reel, which carries a rotating reel roll (2) surrounded by a roll (R) formed of a paper web (W) entering the reel and cutting the web (W) on the roll, characterized in that in a direction substantially opposite to the direction of rotation of the roll, a medium blowing is performed substantially tangential to the circumferential surface of the roll, which acts on the end of the truncated web 10 on the roll, traveling with the rotation of the roll. Method according to claim 1, characterized in that the blowing takes place in the direction of the point of impact of the force applied to the surface of the roll. 15 Method according to Claim 2, characterized in that the blowing takes place in the direction of the point of contact between the roller and the printing device (3) against the direction of rotation of the roller. Method according to Claim 2 or 3, characterized in that the impact point, such as the point of contact between the printing device (3) and the roller (R), is in the direction of rotation in the circumferential surface of the roller, with downward movement of the peripheral surface. between the winding cylinder (1) which guides the roll. 25 Method according to Claim 2, 3 or 4, characterized in that the deflecting device (4) is moved to the surface of the roll with the movement of a force exerting device, such as a printing device (3). 30 Method according to one of the preceding claims 2 to 5, characterized in that blowing is started before the end of the truncated web - (W) on the roll after being cut for the first time passes through an area such as a contact between the printing device (3) and the roll. 35 Method according to one of the preceding claims, characterized in that the blowing is arranged in the form of a wide flat front which. . extends to a portion of the web width or substantially the entire width (W) of the web. 13 107444 Method according to one of the preceding claims, characterized in that the blowing device (4) is connected via a valve to a source of gaseous pressure medium. 5 Method according to one of the preceding claims, characterized in that medium is blown over the nip (N) between the winding cylinder (1) guiding the paper web (W) and the new reel roll (2) or the starting reel in the direction of the full roll (R). 10 Method according to Claim 9, characterized in that medium is blown from the direction of the full roll (R) below the horizontal plane passing through the center axis of the full roll towards the winding cylinders (1) to guide portions detached from the paper web to a wrecking system such as . Apparatus in connection with a paper web reel having a rotatable winding cylinder (1) arranged to guide the paper web (W) onto a roll, support structures for supporting a paper web rotating roll (R) 20, and means for cutting or cutting off the roll paper (W). characterized in that the device is a blowing device (4) comprising one or more nozzles connected to a source of gaseous pressure medium which is directed substantially tangential to the circumferential surface of the roll (R) and arranged to provide a circumferential rotation of the roll (R) in the region where the end of the truncated web (W) on the roller runs towards the blowing device (4). Device according to Claim 11, characterized in that the roller comprises a printing device (3) which is movable in contact with the rotating roller (R), wherein the blowing device (4) is arranged to provide against the rotational direction of the roller whereby the end of the truncated web (W) on the roll extends towards the point of contact between the printing device (3) and the roll (R). 12 107444 Device according to Claim 12, characterized in that the blowing device (4) is disposed near the point 14 107444 between the printing device (3) and the roller (R) to cause blowing from the direction of the point of contact between the roller and the printing device. Device according to Claim 12 or 13, characterized in that the blowing device (4) is disposed in the printing device (3) so as to be movable therewith. Device according to one of Claims 10 to 14, characterized in that the blowing device (4) and its nozzle structure extend in a width direction 10 to a part of the width of the web or substantially the entire width of the web. Device according to Claim 15, characterized in that the blowing device (4) is a tube or box extending in the width direction of the web and connected to a source of gaseous pressure medium. Device according to one of the preceding claims, characterized in that the blowing device (4) has at least two blowing points (4a, 4b) which are directed in succession to the circumference of the roll (R) in the direction of rotation of the roll. 20 15 107444