FI108430B - Method and apparatus for tip-pulling a web in a paper web wheelchair - Google Patents

Description

1 108430

Method and apparatus for inserting a web end in a paper web reel

The invention relates to a method of inserting the end of a web in a paper web reel of the type shown in the preamble of claim 1. The invention also relates to an apparatus for inserting a web end of the type shown in the preamble of claim 7.

After a web break or shutdown, the paper web must be made to pass through the machine again. In the paper web threading, a narrower threading strip separated from the full-width web is guided to a winding cylinder and lowered to a pulper, after which the threading strip is spread into a full-width web and moved around an empty reel roll introduced into the reel by some suitable method. Subsequently, continuous rolling to machine reel may be initiated, whereby, in the case of roll changes, the full-width web going into a full reel is replaced with a new reel reel by some suitable change method.

Various aids are known in the art for controlling the headband, such as headbands and air blows controlling the headband. The aim is to achieve cordless tapping so that the tensioning ropes and the guide wheels are not needed, and the tensioning strap could be guided in some other way. A common problem in guiding the 25 threading straps is that the strap tends to hit various obstacles and deviate from the intended direction at high speed. Such problems are present in all sections where, for example, the web is not supported on both sides, for example between the cylinder or roll shell and the support fabric. As a result, the introduction of the threading strap 30 onto the reel and over the reeling cylinder is also demanding.

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European Patent 658504, corresponding to US Patent 5531396, discloses a roller in which an endless air-permeable support belt is looped over a roller cylinder and guided from a roller cylinder by a movable auxiliary roller disposed downwardly in a machine direction; ; ·; the ground also against the circumference of the web being rolled from the web. Support strap. ·. : the loop passes over the reeling cylinder in a small sector and then slopes downwardly onto the auxiliary roller and then to the 2 108430 guide rollers below the auxiliary roller, which pivots the belt to return to its starting position, which is the roller before the roller body. The air-permeable strap extends over the entire width of the web. The winding cylinder is provided with a suction sector to hold the web on the support belt and there may also be a suction box below the support belt to secure the web on the belt prior to the winding cylinder.

This arrangement allows the web to be supported with the aid of a support strap from the calender to the reel, and it is possible to use this support also for the export of the strap to the reel. The belt also allows the web to be supported through the auxiliary roller from the winding cylinder to a roll which is spaced apart from the winding cylinder, and the auxiliary roll then presses the roll and the belt against the roll to prevent the roller from loosening. Em. for purposes, the result is a long belt loop which requires many guide rolls 15 and thus increases the number of parts in the reel.

It is an object of the invention to provide a new method by which the critical points of the threading in the reel can be realized more simply. To accomplish this purpose, the method 20 according to the invention is essentially characterized in what is set forth in the characterizing part of the appended claim 1. The air-permeable support belt is passed as a loop around the winding cylinder, thereby forming a pivoting cylinder, i.e., rotating the support belt loop in the opposite direction to the return portion toward the start of the web entry portion. In the simplest form, the loop is formed by a roller roller and a pivoting roller located before the roller roller. Support straps and guide rollers:; less is needed, and the threading strap and full-width web are allowed to fall into the pulper or similar wreckage system over the belt running around the circumference of the roll • · «v ♦ 'block cylinder. During normal winding 30, the support belt passes through the winding nip on the surface of the winding cylinder and then continues on the surface of the winding cylinder toward the return portion of the support belt loop. It is also possible that the strap loop is located outside the actual web edge at the edge of the winding cylinder, so that it * * ·: is suitable for the waistband width.

35 Λ- A suction is produced through the roller sheath which, by virtue of the air permeability of the strap, holds the strap or web on the surface of the strap. The suction is arranged to act in the sector in which the winding belt 108430 passes over the reel cylinder, and preferably the suction zone begins in the direction of rotation of the reel cylinder prior to the point where the support belt enters the reel cylinder.

With the above solutions, it is possible to insert the web, either as a narrower threading strap or as a full width web, into a reel and, after a reel drum, to rout it down to a pulper or similar wreckage system.

With respect to other preferred embodiments of the process, reference is made to the appended dependent claims 2 to 6 and the description which follows. For example, a second suction may be provided under the support belt prior to the winding cylinder by means of a suction box or the like.

The apparatus according to the invention, in turn, is characterized by what is set forth in the characterizing part of the attached claim 7. By means of a short, air-permeable strap loop having a winding cylinder at one end and a swivel roll at the other end, a supported web is provided to the reel and after the reel to a shelf handling system 20 with a simple structure.

For other preferred embodiments of the apparatus, reference is made to the appended claims ... 8 to 12 and the description which follows.

: 25

The invention will be further described below with reference to the accompanying drawings, in which: ··· * · ·

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Figure 1 shows a side view of the apparatus according to the invention, Figure 2 shows the principle of a suction device for use inside a roller barrel or below the support belt, "Figure 3 shows a more detailed sectional view of one embodiment of the apparatus, *". ·. Fig. 4 shows a detail of Fig. 3, 4 10 08 430 Fig. 5 shows a perspective view of the headband strap, and Fig. 6 shows a perspective view of a full-width web strapping device.

Figure 1 is a side view of the apparatus. The roller located at the end of the paper machine or paper finishing machine includes a rotating winding actuator 1 which is driven and rotatably mounted on a stationary bearing bracket in the roller. As is known, the reeling inserter guides the web entering the reel to the reel reel 2 so that it is in contact with the reel reel 2 forming the reel nip. As is known in the art, the reel roll 2 is rolled with machine rolls from a full-width web coming from the previous machine parts at high speed 15 (typically over 1000m / min on paper machines). The web passes through a winding nip formed by a reeling cylinder 1 and a reel roll 2. The figure illustrates a situation in which, before continuous rolling, the threading strap 3 passes through the reeling nip between the reeling cylinder 1 and the empty reel reel 2 and goes down to a wreck-20 handling system such as a pulper. The spool reel 2 may also be rotated with a center drive and, in the initial position of Figure 1, as well as during actual winding, may be loaded against the reeling cylinder 1 by means of loading devices not shown. The Tam drill roll 2 is also supported at its ends on a suitable support structure, such as on rails in the machine direction, or on the support of a carriage movable in the machine direction.

• At least a full-width web-wide support belt 4 is provided around the reeling cylinder 1 to form an endless belt loop. The support 30 strap may be a suitable, air permeable, relatively thin and flexible support structure such as a support wire. In the support wire, openings that allow air passage occur between the filamentous elements, as in the woven structure. The support strap 4 is threaded as a loop around the winding cylinder 1! such that the reeling insertion forms a loop pivot point, or 35 pivoting cylinders. In the direction of web travel before the winding cylinder 1 si-: * ·. divides the second loop of the loop 5, which guides the roll in a straight run; a return portion from the bobbin cylinder 1 back to a reeling cylinder jacket 5 108430 for conveying the web and threading tape to the reeling cylinder 1.

The passage of the threading strap 3 corresponds to the passage of the web so that it passes through the transport portion 5 from the pivoting roller 5 over the support strap 4 to the winding cylinder where it passes over the support strap in a particular sector and after the nip between the reel roller 2 and the winding cylinder 1. After the release point, the strap extends over the winding cylinder 1 in a particular sector and returns to the rotating roller 5. , from which it gradually begins to move away from the winding cylinder, either by the rails or in the carriage 15 or supported by another support structure, due to the increase in the radius of the roll.

A suction is provided inside the strap to secure the threading strap, which holds the threading strap on the strap 4. The suction is provided by a suitable suction device 6 positioned below the transport portion 20 to act on the strap on the other side of the strap through the air-permeable strap. The suction device 6 may be an ordinary suction box connected to the suction duct or preferably of the type described below.

At least part of the sector in which the threading strap 3 passes through the reeling cylinder 1 has a suction zone 7 within the reeling cylinder. The suction zone may be obtained by connection with suction reeling cylinders by a known technique or by the preferred alternative shown below. 1, the suction zone 7 begins before the point of entry of the support belt and ends after the nip between the cylinder and the reel roll. The suction zone 7 may be arranged in a longitudinal direction. Underneath the nip, there may be, in the vicinity of the winding cylinder 1, against the direction of rotation of the winding cylinder,

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35 natural air bladder or full-blown blast to prevent head; rotation of the export tape or web around the winding cylinder 1. · · · (arrow A).

6 108430

In the situation of Fig. 1, the threading strap 3 is guided by a suitable arrangement to the beginning of the transport portion of the strap loop, from which the strap 4 guides it to the winding cylinder 1 and to the periphery of the winding cylinder up to the point where the threading strap disengages. The empty reel roll 2 is against the strap to form a pull nip, or the reel roll 2 is brought into contact with the support strap and the threading strap 3 narrower than the full width web over it to form a nip. As the threading strap passes through the nip, the web is applied to the full width by an inclined cut which may be performed by methods known per se. The full-width web flowing down through the nip is then displaced by any suitable method around an empty Tam drill roll 2, for example by blowing. When the end of the web is thus introduced into the spool reel, continuous rolling can be initiated into successive machine reels.

15

Fig. 2 shows a preferred way of applying vacuum to the suction device 6 under the support belt 4 or to the suction zone 7 within the reeling cylinder 1. The structure shown can be used in or in both suction regions, one applying conventional suction duct technology. According to Fig. 2, vacuum is created by blows discharged from nozzles 8 extending across the width of the headband or web, by ejector action, suction acting through the support belt 4 or through the opening sleeve of the roller cylinder 1 and the support belt. 3. The nozzles may be narrow nozzle slots located in the width direction or be formed adjacent to each other; nozzle sets. The nozzles 8 are successively in sufficient number s * · in the longitudinal direction of the transport portion of the support belt 4 or in the suction zone: T: longitudinally. The compressed air source to which the nozzles 8 are connected is marked by the letter P.

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The advantage of suction produced by blowing is that large suction channels are not required, but that pressurized air can be conveyed by smaller blowing channels to a box under the support belt 4 or into the suction zone 7 within the reeling cylinder 1.

«« ♦ •. Fig. 3 is a detailed sectional view of the apparatus of Fig. 1, seen from the side, with respect to the suction device 6 108430 inside the belt 4. The box suction device 6 is designed so that it extends as far as possible at the rear end into the opening opening or wedge-like space between the support belt 4 and the pivoting roller 5, and mainly into the closing opening 5, i.e. the wedge-like space correspondingly, the envelope of the winding cylinder 1 is next, for example curved. Inside the box are the nozzles 8 described above, which open from their own blow boxes. The air flow from the nozzles begins to follow the nozzle slot or similar nozzle structure 10 following the surface of the blower box and turns downward, thereby creating a vacuum by ejector action. As shown in Figure 3, the nozzles 8 may open in and out of the belt travel direction, and the same nozzle box may open in nozzles in opposite directions, the invention is not limited to the nozzle structures shown above, but other nozzle locations can also be used

The air blown from the nozzles 8 is discharged from the mold box 20 of the suction device 6 down into the loop formed by the support strap 4, from which it can be led away. The bottom of the box is then sufficiently open to allow unobstructed air to escape into the belt loop. The box is open enough from above to allow the suction to act on the underside of the support strap 4, and to seal the vacuum region 25 bordering the strap it can be sealed from the sides to the edges of the support strap 4: by, for example, a mechanical seal; air blows that can be taken to the suction unit 6 for •• T: air supplied in a suitable manner. In particular, the boundaries of the swivel roll 5: T and the winding cylinder 1 and the support belt 4 are sealed at the sides.

For example, when opening the opening between the pivot roller 5 and the support strap 4 at the beginning of the carrying portion of the strap loop, the gap between the rear wall of the suction box 6 and the pivot roller 5 is induced by the rotational movement

XX 35: X Fig. 4 shows in detail the area of the closing rod between the support belt 4 and the winding cylinder 1 X '. As stated above, the suction zone 7 preferably starts before the junction of the support belt 4 and the winding cylinder 1, i.e. 108430, i.e. it is located in the sector a before the junction. Between the suction box 6 and the free sheath of the reeling cylinder 1, a seal 9 is located which is located in the direction of rotation of the reeling cylinder 1 at the same position where suction zone 7 begins and preferably 5 min before the suction zone. only through the area after seal 9 before the junction of the winding cylinder 1 and the support belt 4. In this area after seal 9, the gap is also well sealed at the sides. The seal 9 may be a mechanical seal, for example a brush, but instead of a mechanical solution, sealing blows directed against the direction of rotation of the winding cylinder may be used, in which air may be drawn from the same compressed air source P as the air required by the nozzles 8.

It is also possible to arrange the front wall of the box of the suction device 6 from the area inside the seal 9 so that the suction of the suction zone 7 of the winding cylinder 1 can also act on the box as shown in Fig. 4.

As stated above, the same ejector blowing solutions as used in Figure 3 inside the suction device 6 can be applied in the suction zone 7 within the reeling cylinder 1. The suction zone is insulated from the rest of the cylinder by suitable barrier walls. The blowing air can be supplied from a source of compressed air through the end of the cylinder 1: to blowing boxes with nozzles located within zone 7; 8, for example nozzle gaps or nozzle set kits, and air from nozzles 8 "may be allowed to radially vent to and from the center of the cylinder through the end of the cylinder. Blows away from the sheath of the reeling cylinder 1 provide a vacuum range bordering the inner surface.

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Fig. 5 is a perspective view of the threading of a web in the form of a threading strap 4 narrower than a full-width web. The threading strap • · * may consist of a so-called "strip" separated from the edge of a full-width web. edge strip *: 35 webs, but it can also, as shown in dotted lines in Figure 5, also be a strip separated from the middle of the web. Fig. 3 also shows pre-V. * alternatives according to which the suction device 6 and / or the suction zone 7 ': acts on a narrower area of the width of the full-width web, for example at the point where the threading strap 4 passes. If the suction zone 7 of the winding cylinder 1 is narrower than the winding cylinder at one end thereof, the winding cylinder jacket need only be air permeable at this width, and an arrangement may be provided wherein the at the perforated peripheral area, a sleeve-like recess remains, within which the structure implementing the suction zone 7 can be located and connected to the suction or compressed air, depending on the manner in which the vacuum is formed.

10

In addition, it is possible to divide the suction device 6 or suction zone 7 in widthwise compartments, for example, by blowing into the compartment just at the headband, i.e. it is active for pulling the headband 3 onto the support strap 4.

When applying a widening web and a full-width web after the threading strap 3, the area of influence can be spread over the entire suction device 6 or suction zone 7 so that air blowing out of the nozzles 8 over the entire width of the device 6 or zone 7.

Figure 6 shows the threading of the web in the form of a full-width paper web W. Here, it is obvious that the suction acts on the entire width of the web in the suction device 6 and in the suction zone 7. They may also be compartmental. In the event that the threading is performed in the form of a full-width web, the main ribbon.

'Λ; Embodiments of the invention may vary within the scope of the appended claims. A prerequisite for good tapping is that: T: at least from the inside of the winding cylinder 1, a suction is applied to the tapping tape or the full width web, but the area where the tapping tape or full width web is long-distance retention is achieved by providing suction also before the reeling cylinder for the support * * ♦ ··· portion.

* * «. · * · * *:. ·; The loops of the support belt 4 may be guided by rollers other than the pivoting roller 5. The support belt 4 is disengaged from the winding cylinder at a convenient position within its lower half (1 * »V j of the horizontal plane passing through the rotation axis) The guide rolls may be provided on the return portion of the support strap 4 outside and / or inside the strap loop starting at the ice of this section.

The support strap 4 itself can also pass as a narrow strap through the winding cylinder 15 outside the actual periphery of the web, making it lightweight for the headband. The principle of running the belt from the side is then the same as described above, and for such a narrower belt a suction device 6 and a suction zone 7 of corresponding width can be used.

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Claims (12)

108430 A method for inserting a web end in a paper web reel, wherein a machine roll of a full width paper web is wound around a reel roll (2) 5 and wherein the paper web (W) is carried over the jacket of the reel drum (1) the web being held in the belt by means of a suction acting on the roll of the winding cylinder, characterized in that the support belt (4) is threaded around the winding cylinder (1) 10 forming a loop pivoting cylinder of the support belt (4) after the nip and the web (W) disengages from the support belt (4) after the nip while the support belt (4) continues on the winding cylinder (1) after the release point. 15 Method according to Claim 1, characterized in that the web (W) is held in the belt by a suction acting on the passage of the support belt (4) before the winding cylinder (1). Method according to claim 1 or 2, characterized in that the suction through the jacket of the winding cylinder (1) is effected by the flow of gaseous medium from the nozzles (8) inside the jacket of the winding cylinder (1). A method according to claim 2 or 3, characterized in that the suction through the support belt (4) is provided inside the belt loop by the flow of gaseous medium from the nozzles (8). «» I ·· A method according to any one of the preceding claims, characterized in that the end of the web (W) is extended by means of a support strap (4) in full width. . ···. A method according to any one of the preceding claims, characterized in that the end of the web (W) is carried by means of a support strap (4) as a strip (13) narrower than that of the full web 35 (W). 108430 Apparatus for inserting a web end in a paper web reel arranged to roll from a full-width paper web around a machine reel (2), comprising an air-permeable support belt (4) passed through a rotatable winding roller (1) and 5 for providing suction, characterized in that the support belt (4) is threaded around a winding cylinder (1) which forms a loop pivoting cylinder of the support belt (4) so that it extends over the winding cylinder after the nip between the winding cylinder and reel roll (2) after the exit point. Apparatus according to claim 7, characterized in that, in the direction of travel of the support belt, a suction device (6) arranged to act through the support belt (4) is located before the winding cylinder (1). 15 Apparatus according to claim 7 or 8, characterized in that the means for effecting suction through the winding cylinder (1) comprises blowing nozzles (8) disposed and oriented so as to provide a vacuum region 20 bordering the inner surface of the winding. A method according to claim 8 or 9, characterized in that; wherein the suction device (6) acting through the support belt (4) comprises blowing nozzles (8) disposed and oriented so as to provide a vacuum region bordering the inner surface of the support belt (4). «» « Apparatus according to one of the preceding claims 7 to 10, characterized in that the suction zone (7) inside the winding cylinder (1) provided by said members starts before the junction (sector a) of the support belt (4) and the winding cylinder (1). . ♦ · • · · Apparatus according to claim 11, characterized in that, in the direction of rotation of the winding cylinder (1) at least at the beginning of the suction zone (7) of the winding cylinder (1), a seal (9) such as a mechanical seal or blower lus, which in the circumferential direction of the winding cylinder (1) insulates from the rest of the inner part of the support belt (108430) an area bordering on the junction of the support belt (4) and the winding cylinder (1). * · 1 * 1 · • · · • tl • I »• · • Φ · • # · 108430