EP0464535B1 - Device for fastening a paster tab at the end of a web and on a drum, which is configured by the web - Google Patents

Abstract

A supporting beam 4 bears a hollow, box-shaped carrier 11, on which there is situated, substantially tangentially with respect to the circumferential surface of an associated guide roll 2, a presser surface 5 for the paster strip. A slot 6 for holding the paster strip A is situated perpendicularly to the presser surface on the box-shaped carrier 11. A considerable part of the paster strip A, from which the cover film has been removed, projects from said slot. Blowing means or blowing channels 9 with blowing ports 10 bend upwards that part of the paster strip projecting from the slot 6, so that, as the supporting beam 4 moves nearer to the guide roll 2, said part of the paster strip lies practically against the presser surface 5. In this way, the paster strip can be fastened on the end of the web, which is wrapped over the guide roll 2. <IMAGE>

Description

In the manufacture of coated paper, it is necessary to make a connection between the draining end of a reel and the beginning of a new reel, usually using an adhesive tape or tape. These tapes or strips are generally coated on both sides with adhesive. The application of the adhesive tape or strip to the end of the web and to the drum that the web forms is correspondingly cumbersome. So far, this has been carried out by hand.

GB-A-1400684 describes a device for applying an adhesive strip to the outer end of a reel. Among other things, this facility a support beam, which is integrated in a cutting roller; there is a holding slot for an adhesive strip below the supporting beam; the device also has a knife, which is provided with its cutting edge directly below the holding slot, and the support beam is rotatably arranged about an axis parallel to its longitudinal axis.

This device serves to connect two paper webs to one another. The invention, however, relates to a device which is used to prepare a paper roll for a later connection process.

The object of the invention is therefore to provide a device in which the individual processes are carried out essentially by machine. This object is achieved with an adhesive tape which is essentially coated on one side with adhesive and which only has a further adhesive layer on its other side in the region of one longitudinal edge, in accordance with a device defined by the features of claim 1.

It is so that the guide roller is in the vicinity of the reel to be replaced, so that the end of the web from which the reel is wound can be knocked over the guide roller. The end of the web is then cut off at a certain point, at which the adhesive tape held in a slot in the beam is also adhered to the new web end by a holding surface held by a supporting beam. The adhesive strip sticks out only with the part out of the slot, the part of the adhesive surface of which is exposed for attachment to the web, ie in general is first freed of a cover film. This end is brought into the vicinity of the contact surface by a blowing device, the adhesive strip being deformed at an angle in cross section.

The invention is explained below with reference to the exemplary embodiments described in the figures of the drawing, essentially only a single exemplary embodiment being shown.

Figur 1

einen Querschnitt - teilweise in abgebrochener Darstellung - des Tragbalkens und der Leitwalze,

Figur 2

eine Einzelheit des Klebestreifens nach Umformung,

Figur 3

eine weitere Einzelheit des Klebestreifens in bezug auf den Tambour,

Figur 4

eine Seitenansicht, teilweise im Querschnitt der Gesamtanordnung und

Figur 5

eine weitere Einzelheit im Querschnitt des unbearbeiteten Tambours und

Figur 6

im Querschnitt einen vergrößerten Querschnitt des Tragbalkens mit geändertem Messer dar.

It poses

Figure 1

a cross section - partially in broken view - of the support beam and the guide roller,

Figure 2

a detail of the adhesive strip after forming,

Figure 3

another detail of the tape in relation to the drum,

Figure 4

a side view, partially in cross section of the overall arrangement and

Figure 5

another detail in the cross section of the unprocessed drum and

Figure 6

in cross section an enlarged cross section of the support beam with a modified knife.

In Fig. 1, the web end H detached from the drum C lies above the guide roller 2 and hangs down here on its left side. The guide roller, which is designed as a hollow roller, has a rubber-elastic jacket 22 made of plastic. Approximately at the height of the central axis of the guide roller is a pressure surface 5, which is formed here by a strip made of rubber-elastic material. This is attached to a box-shaped support 11 which is held by the support beam 4. This support beam, like the box-shaped support 11 and the pressure strip 5, is arranged parallel to the central axis of the guide roller 2 and the spool C and has a pivot axis 19 that also has this direction. Also arranged in this direction and with the same length, there is a holding slot 6 under the box-shaped carrier 11 and a knife 7 provided with a cutting edge 8, which is designed as a spring steel angle. This knife is brought into the cutting position by means of a pressure hose 12. The knife is fastened to the supporting beam 4 by means of a clamping strip 13. Below the knife 7 there are blowing channels 9 with openings 10 for blowing air. Further blowing channels 15 are located below these blowing channels and are connected to a central air channel 14, which also extends parallel to the central axis of the guide roller 2. A guide surface 16, which generally consists of thin sheet metal, is arranged below the blowing channels 15. As shown, the web end H is held in a position suitable for cutting by this guide surface. It also facilitates threading the paper web and unwinding several meters of paper web from the reel.

An adhesive tape is used which is essentially completely covered on one side by an adhesive layer which is covered by a cover film D divided in the longitudinal direction of the adhesive tape. On the other hand, the adhesive tape has a narrow adhesive strip near its one longitudinal edge, which consists of an adhesive layer F and a cover film E. In Fig. 2 the adhesive tape A is shown in the position in the slot 6, in which it is after the suction (6) and the blowing up of the part already freed from the cover film through the blowing openings 10. The cover film is only removed when the adhesive tape has been completely sucked onto the surface 5 and 6. When the nozzles 10 blow, the surface 5 is vacuumed so that the adhesive tape lies directly on the surface 5. After the support beam 4 or the contact surface 5 has been brought closer to one another by pivoting the support beam about the pivot axis 19, the adhesive tape can then be connected to the end of the web in this position, the unnecessary End of web H is cut off by knife 7. The plastic jacket 22 of the guide roller 2 must also be provided for this purpose. A very suitable plastic is polyurethane. The knife 7 separates with its cutting edge 8 the superfluous end of the web practically directly below the beginning of the contact surface 5, so that the adhesive tape is glued practically abutting the remaining cover film part D and the end of the web.

After gluing, changing the suction to bubbles on surfaces 5 and 6 (slit) can make it easier to pull out the adhesive tape from the latter.

3 shows the position of the adhesive tape after the web end has been rolled back onto the reel C. Here, the cover film E of the small adhesive tape has also been removed, so that the end of the web by means of the adhesive tape A could be attached to the drum C tightly. The adhesive tape A still carries the second cover film part D. Shortly before the actual splice process begins, this cover film part is then finally removed.

The blown air channels 15 serve to guide the web end H into the correct position and down without human help.

With regard to the approach of guide roller 2 and drum C, reference is made to FIG. 4. In this case, the guide roller 2 is fixed (but rotatable about its central axis) and the approach of the guide roller 2 and drum c takes place through the storage of the drum C, which can be adjusted in the horizontal direction by means of the spindle 27. The actual bearing point 26 of the drum has an incline so that its bearing axis always has a certain position with respect to the drum bearing. This bearing 25 is located on a reel 24. Preparing the adhesive seam on a reel is the most difficult case; usually the drum is placed on a stand with a sloping track with a crane.

It can be seen from this figure that the contact surface 5 is essentially at the same level as the central axis 18 of the guide roller 2. Below the guide roller 2, a deflector plate 33 is also provided for the web end H, wherein the web end can be removed from the guide roller 2 by means of blowing channels 31 connected to a central air duct 30. Additional blowing openings of the air duct 30 direct air flows essentially tangentially to the guide roller in its lowermost region, so that the web end H has to slide along the guide surface 33.

5 shows a detail of how the drum C looks before the processing operation with the adhesive tape. The left end of the web is shown here, which is attached to the circumference of the reel C by means of adhesive tape I.

A supporting beam is also possible, which can be pivoted about a central pivot axis. Accordingly, the contact surface is then also curved with a center of curvature that lies in this pivot axis. By rotating the guide roller by a corresponding angle, the adhesive tape can also be attached to the end of the web, which is to be used when the diameter of the guide roller would have to be kept relatively small.

In Fig. 4 it is also shown that the guide roller 2 can be movably mounted on side pivot arms (shown in dash-dot lines). Further swivel arms 38 connected to these swivel arms and shown in dash-dotted lines then allow the support beam 4 or the pressing surface 5 to be swiveled towards the guide roller 2 by means of the hydraulic lifting elements indicated.

The guide roller 2 can be provided with holes in its jacket, so that the web end can be sucked onto the jacket surface of the guide roller 2 by means of a vacuum applied inside it. If you then bring the reel C in a position in which it rests on the guide roller 2, by rotating the reel C by means of the guide roller, which is coupled to a motor, clockwise the end of the web along the outer surface of the guide roller 2 to the guide surfaces 16 and 33 are performed. In the opposite direction, the adhesive strip A is then firmly connected to the drum.

The whole arrangement is advantageously to be provided in such a way that the guide roller is arranged in the lower quadrant of the drum C, it preferably being arranged so deep that the common tangent of it and the drum C of the largest possible diameter runs essentially horizontally.

It is of course not absolutely necessary for a drum wagon to be used in the process of attaching the adhesive strip to the drum. Instead, one could also use a support bracket, which preferably has an inclined plane as a holding surface, so that the drum rests against the guide roller 2 with a certain contact pressure due to this inclination.

On the other hand, this trestle could also have levers which brake or push the axis of the drum by pneumatic lifting elements, so that one could generate a controlled contact pressure of the drum C on the guide roller 2.

The general point of view is that the arrangement can be operated by the staff without catwalks.

• I: Die Leitwalze ist "ortsfest"; der Balken ist schwenkbar, dann muß der Tambour je nach Durchmesser zu der Leitwalze zugeführt werden, z.B. wird mittels Kran der Tambour an eine "schräge Laufbahn" gelegt oder am Tambourwagen, z.B. mittels Spindel, zur Leitwalze geschoben. Angepreßt wird entweder mit Hubzylinder oder mit "Eigengewichts-Komponente" in Horizontal-Richtung.
• II: Bei dieser Variante ist der Tambour ortsfest; dann muß von dessen Durchmesser abhängig die gesamte Vorrichtung (Leitwalze und Balken) an den Tambour herangeschwenkt werden.

There are two ways to prepare the glued seam:

• I: The guide roller is "stationary"; the bar can be swiveled, then the reel must be fed to the guide roller depending on the diameter, for example, the reel is placed on an "inclined track" using a crane or pushed to the guide roller on the reel spool, e.g. using a spindle. Is pressed either with a lifting cylinder or with "dead weight component" in the horizontal direction.
• II: In this variant, the drum is stationary; then, depending on its diameter, the entire device (guide roller and beam) must be pivoted towards the reel.

The adhesive tape is advantageously placed in the slot 6 with a transport belt, e.g. Flat belt, drawn in.

In the embodiment according to FIG. 6, a knife blade 20 is provided which runs completely parallel to the plane of the slot 6 and is also arranged to be movable in this direction alone. The knife is held by a guide bar 23, which is guided in a dovetail guide, and by guide blocks 28, which are screwed onto the knife. These guide blocks are guided in obliquely arranged slots 29 of the guide bar 23. When the latter is axially displaced, that is to say in the direction of its longitudinal axis, the knife is displaced transversely to this direction of displacement and thereby cuts off the superfluous end of the paper web on the guide roller 2 after the adhesive strip has been applied the contact surface 5 rests completely. In this figure, the suction openings 40, which lead from the hollow support 11 to the contact surface 5 and pass through it, are also shown. Furthermore, there are also the blowing openings 41 which are connected to the blowing air duct 42 are, which is sealed by means of seals 43 against the support beam. Further suction openings 45 of the hollow carrier 11 can be provided in order to fix the adhesive strip in the slot 6. However, this is also possible (for example, if a hollow beam 11 is not used) by means of a pressure hose 21. Instead of the guide bar 23, this knife could also be used to actuate the knife 20 if it has a pressure bar at its end facing the pressure hose - as shown in dash-dotted lines shown - would have. The knife would then be able to be returned to the rest position by ribbon springs 46, as also shown in dash-dot lines.

Claims (10)

1. Device for applying an adhesive strip to the (outer) web end (web beginning) of a drum with the following features:

   a) a supporting beam (4) is disposed close to a guide roller (2) parallel thereto and has in its longitudinal extension a pressing surface (5) for the adhesive strip (A);

   b) below the pressing surface (5) directly adjacent thereto there is a nip slot (6) for the adhesive strip (A) parallel to the longitudinal axis of the supporting beam, the width of which is dimensioned for the part of the adhesive surface of the adhesive strip still covered in protective film later used later for the splice connection;

   c) a blade (7) is provided with its cutting edge (8) directly below or in the lower plane of the nip slot (6);

   d) the supporting beam is pivotably disposed about an axis parallel to its longitudinal axis, preferably about a lateral axis (19), disposed close to the guide roller (2);

   e) a guiding surface (16) is provided for the paper web end to be separated to guide it downwards, having a blow device or blow elements (14, 15) disposed above the guiding surface (16) with a stream of air directed lateral upwards mainly in the direction of the lowest point of the guide roller (2).
2. Device according to claim 1, characterised in that a blow device or blow elements (9, 10) for blowing upwards the part of the adhesive tape (A) protruding out of the nip slot (6) are disposed beneath the nip slot, at least close to the pressing surface (5) of the supporting beam (4).
3. Device according to claim 1 or 2, characterised in that the blade (7) is designed as an angular spring leaf and is pivotably disposed at right angles to the pressing surface (5) of the supporting beam (4).
4. Device according to claim 3, characterised in that the blade (7) is disposed at the output end of the nip slot (6) for the adhesive strip (A) with its tangential end provided with the cutting edge (8).
5. Device according to claim 3 or 4, characterised in that a pressure hose (12) is provided as a pressing element for the blade (7).
6. Device according to one of claims 1 to 5, characterised in that devices are provided for adjusting the distance between the drum (C) and the guide roller (2).
7. Device according to one of claims 1 to 6, characterised in that the guide roller (2) is provided with a rubber-elastic sleeve and is disposed beneath the bearing centre of the drum (C).
8. Device according to claim 7, characterised in that the diameter of the guide roller (2) is at least 500mm, the pressing surface (5) of the supporting beam (4) is smooth and adopts a mainly tangential position in relation to the guide roller on transferring the adhesive tape.
9. Device according to one of claims 1 to 7, characterised in that the pressing surface (5') is curved, whereby the curve middle axis is parallel to the pivot axis of the supporting beam (4') which is runs through the centre of the supporting beam (4').
10. Device according to one of claims 1 to 9, characterised in that a hollow beam (11) bears the pressing surface (5) from the inside of which suction openings are guided through the pressing surface (5).

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