EP0450312B1 - Method for splicing the beginning of a travelling web at a splicing point with the end of a web unwound from another roll - Google Patents

Abstract

For the purpose of producing a web splice an adhesive tape is used which has an adhesive layer (3) essentially only on one side. The cover film of this adhesive layer consists of two parts (4 and 5) which are separated by a longitudinal seam (9). Applied on the other side of the substrate (band 2) of the adhesive layer (3) is at least one narrow adhesive strip (7), also having a cover film (8), which is preferably situated at one edge of the adhesive tape (1). <IMAGE>

Description

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

It is a method for producing seam connections of running material webs on unwinding devices, e.g. known for coating devices, in which a double-sided adhesive tape is glued to the end of the web wound to form a drum. When the end of the web is then fixed to the spool, the second cover film is removed from the adhesive tape, so that when the old web that runs past the spool is pressed on, the ends of the webs are connected. This has the disadvantage that in the subsequent coating device, e.g. on a blade serving as a doctor element for the coating slip, a strong impact is created by the front end of the added paper web on the blade. Furthermore, a certain, albeit small, sump of coating slip also arises at this point, which tends to contaminate subsequent rollers, deflection rollers, etc.

From DE-C 30 02 069 a method for performing a splice connection has become known, in which a double-sided adhesive tape is used, which carries a cover tape on one side, which has only a one-sided adhesive layer, and with the non-adhesive side the first tape is glued on. With its other side, the tape thus combined is glued to a carrier bar. By pressing the support rod against a winding roll, the double-sided adhesive tape is glued to the outermost turn of the winding roll, and then by Removing the carrier rod, the one-sided additional adhesive tape is separated from the double-sided adhesive tape. With the help of the double-sided adhesive tape, the beginning of the web of a new web is then glued to the end of the winding roll in a carrier roller winding device. The splice connection is therefore intended to establish the web connection in a carrier roller winding device, the preparation of the end of the web of the old winding roll taking place immediately before the splice process in the winding device. If one wanted to use this method in general, that is, in particular for the case of producing rail connections for webs that are used in coating devices, one would have the disadvantage already described that a relatively thick impact could also seriously impair the operation of the coating device. The thick joint is caused by the fact that both the end of the web of the old winding roll and the adhesive strip with their total thickness have to pass under the coating element, for example a coating blade. Furthermore, the method described is only suitable for the device described there on a winding machine, where the preparation of the web end for the splice takes place immediately before the splice process. In the case of coating devices, however, it is common and also necessary for the new winding roll to be prepared a considerable time before the splice process for the purpose of storing and transporting it.

In the process according to DE-C 23 52 594, a double-sided adhesive tape and additionally a single-sided adhesive tape and two auxiliary tapes are used. In order to carry out the process, a special, quite extensive device is required, which turns the beginning of the web of the old winding roll.

The object of the invention is to provide a method which makes it possible to produce a web connection without the disadvantages mentioned, in which case, in particular, there should be only a small butt joint and a low butt edge of the web during the later splice process of the running web (s).

This object is achieved by the features of the characterizing part of patent claim 1.

With the method according to the invention it is achieved that there is only a very low impact on the coating element of the coating device, which essentially corresponds to the thickness of the one-sided adhesive tape. This largely prevents the web from tearing off on the coating element, in particular a coating blade. The auxiliary adhesive strip remains at another point in the web winding and is also only a small thickness, so that here too there is only a small joint. This auxiliary adhesive strip can also have a very small thickness, since no great demands have to be made on its strength properties.

For a better separation of the auxiliary adhesive tape from the adhesive tape, it is advantageous if an auxiliary adhesive tape is used which is covered on both sides with an adhesive layer, in which the adhesive strength on its side facing the winding is considerably stronger than on its side facing the adhesive tape.

If another, single-sided adhesive tape is attached to the auxiliary adhesive strip, the combined adhesive tapes may adhere to a tape that has been in storage for some time Moisture which has become wavy is better attached to the winding roll, the only adhesive layer of the further adhesive tape being on the side thereof which faces the web winding. Such a combined adhesive tape can also be produced by folding over a correspondingly wide adhesive tape provided with auxiliary adhesive strips.

Figur 1

das erfindungsgemäße Klebeband,

Figur 2

einen Ausschnitt des mit der fertigen Stoßstelle versehenen Tambours der Warenbahn,

Figur 3

die Verhältnisse an einer nachgeordneten Streichklinge S einer Streicheinrichtung,

Fig. 4-7

weitere Klebebandformationen, wie in Fig.1 jeweils in Ansicht quer zur Längserstreckung der Bänder,

Figur 8

eine Ansicht quer zur Achse des Tambours auf den Bereich des Bahnanfangs,

Figur 9

den Splice-Vorgang an einer Umroll-Einrichtung,

Figur 10

einen Tambourwagen mit einer Führung für eine ein Klebeband enthaltende Kassette,

Figur 11

eine Einzelheit in bezug auf die Halterung in Draufsicht und

Figur 12

im wesentlichen eine Ansicht dazu, teils im Schnitt entsprechend der strichpunktierten dicken Linie in Figur 11,

Figur 13

eine Halte- und Gleiteinrichtung zum Führen des Endes der Warenbahn und Aufbringen desselben auf den Tambour,

Figur 14

eine weitere Einzelheit dieser Einrichtung,

Figur 15

eine andere Halteeinrichtung dieser Art, jeweils ein Seitenansicht,

Figur 16

eine Einzelheit der Klebestelle am Ende der Warenbahn zu Figur 13,

Fig. 17 und 18

jeweils automatische Klebeeinrichtungen in anderen, zur Figur 13 ähnlichen Ausführungen,

prinzipmäßig dar.The invention is explained below on the basis of the exemplary embodiments illustrated in the figures of the drawing. Here:

Figure 1

the adhesive tape according to the invention,

Figure 2

a section of the reel of the web provided with the finished joint,

Figure 3

the conditions on a downstream coating blade S of a coating device,

Fig. 4-7

further adhesive tape formations, as in FIG. 1 each in a view transverse to the longitudinal extent of the tapes,

Figure 8

a view transverse to the axis of the drum on the area of the beginning of the web,

Figure 9

the splice process on a rewinder,

Figure 10

a drum wagon with a guide for a cassette containing an adhesive tape,

Figure 11

a detail with respect to the bracket in plan view and

Figure 12

essentially a view of this, partly in section corresponding to the dash-dotted thick line in FIG. 11,

Figure 13

a holding and sliding device for guiding the end of the web and applying it to the reel,

Figure 14

another detail of this facility,

Figure 15

another holding device of this type, each a side view,

Figure 16

a detail of the glue point at the end of the web to Figure 13,

17 and 18

automatic gluing devices each in other designs similar to FIG. 13,

in principle.

In Figures 1 and 4 to 6, the adhesive layer is indicated by dashed lines and corresponding or similar tape parts, e.g. cover foils, too, are identified by the same reference symbols, but with different numbers of commas.

1 shows the adhesive tape 1, consisting of the carrier 2 for the adhesive layer 3, the cover foils 4 and 5, which are separated from one another by a longitudinal seam 9 and adhere to the adhesive layer 3, and the further, narrow, double-sided adhesive strips (also adhesive tape). 7 with a further cover film 8. The adhesive strip 7 can also be replaced by a series of adhesive dots or adhesive surfaces.

The adhesive strength of the adhesive layer of the adhesive strip 7 located under the cover film 8 is considerably stronger than the adhesive force of the adhesive layer on the other side of this adhesive strip 7. Since with this adhesive strip according to FIG. 2, the adhesive tape on the web end C of the spool or web roll A on the same is attached, when this end of the web is torn off due to the pull of the old web when the two webs are glued together, the adhesive strips tend to stick to the drum and not to the adhesive tape 1. This keeps the thickness of the joint on the doctor element (doctor blade S) of FIG. 3 small . As a result, only a very small amount of coating slip can collect at this joint.

One will preferably make the adhesive strength of the adhesive strips 6, 7 (or 10) - which can also each be an adhesive layer alone - on the side facing the adhesive tape 2 etc. narrower than on the other side. You can also - with the same adhesive strength on both sides - form the adhesive surfaces on both sides of different sizes.

The adhesive strip 7 (etc. 6, 10, see Fig. 4; 11, see Fig. 5) follows the splice point at a distance from a drum circumference and can therefore the paper web residues, which may get stuck on the doctor element, which arise when the old paper web is knocked off, remove what is very important for the quality of the applied stroke.

The "end" C of the web is of course the "beginning" of the reel or web roll A.

2 shows the state where the adhesive tape 1 is attached on the one hand to the end of the web C of the spool A, on the side facing the inside of the spool and on the other side to the outside B of the same turn of the web. This can e.g. manually by folding back the end of the web C into the dash-dotted position (loop G), in which this end is temporarily attached to the reel by adhesive pieces P. In the arrangement according to FIG. 2, the cover film 5 has therefore already been pulled off on one side of the adhesive tape 1. 3, the other part of the cover sheet 4 is also peeled off from the adhesive tape 1. This makes it possible to connect the end of the web C to the old web D at this point. The arrows in Fig. 3 indicate the direction of travel of the web. It can still be seen in FIG. 3 that the narrow adhesive strip 7 still adheres to the drum, that is to say it is detached from the adhesive tape 1, specifically here at a point where a reinforcing tape 70 is additionally glued to the drum, but which is also can often be omitted.

Under certain circumstances, however, such an adhesive tape, as just described, is not available, and overall a method for producing a splice site is proposed, and subsequently in detail using different tape formations described. In these, the adhesive strip, for example 6 or 7, can also be a correspondingly wide adhesive film.

As I said, the beginning of the web of the new web reel A is turned into a loop G and glued to the web reel with small pieces of adhesive strip P. Then e.g. the cover film 5 of the adhesive tape 2 is removed and this is glued with this adhesive surface to the web start C parallel to the - axial - web edge (web start equal to the front web end). Then e.g. on the non-glued end (since the cover film 4 is still there) in the area from the longitudinal edge of the tape, a narrow, double-sided adhesive strip 7 with cover film 8 according to FIG. 1 is glued onto the adhesive tape 2. All of this can be done by hand or also by means of a unwinding device for a band, which is guided on a rail parallel to the axis of the web winding. The term "narrow adhesive strip (or adhesive film) here means that it does not have the full width, but for example only a width of at most 80% of the width of the adhesive tape 2, 2 'etc." Within the scope of the invention, "narrow" Apply adhesive tapes.

4, the adhesive tape 2 can also be provided with several smaller adhesive strips 6, 7, possibly also 10 with cover foils 8, 8 'and 8' 'on its non-adhesive side.

A further tape formation results from FIG. 5, where a further adhesive tape 11 of the same width as the adhesive tape 2 'with cover film 12 is applied to the two edge adhesive strips 6' and 7 ', which can also have a separation point E, analogous to the separation point of FIG Cover foils 4, 5 and 4 ', 5'. You can then pull off the parts of the cover sheet 12 one after the other and successively fasten the adhesive tape 11 to the winding and thus also the adhesive tape 2 'and thus also the beginning of the web C to the web winding.

6 shows an adhesive tape with a double-sided adhesive coating. On one side, as previously described, it bears the subdivided cover foils 4 ″ and 5 ″ and on the other side a strip-shaped adhesive layer, as indicated by the dashed lines, the individual film strips being covered by a cover foil 71 to 74 . You can pull off these cover foils one after the other when tightly attaching the beginning of the web C to the web wrap and thus fix the adhesive tape 2 ″ firmly to the web wrap.

Under certain circumstances, this takes place at a point where an additional adhesive tape according to FIG. 8 is applied to the penultimate turn of the web winding. This is preferably a single-sided adhesive tape 70, which is used when the drum has been deformed in the axial direction by the action of moisture and has formed grooves. In this case, the adhesive tape 70 adheres to the humps of the drum A with a very strong adhesive force, and the narrow adhesive strips 6, 7 or 10 or the adhesive tapes 11 (FIG. 5) or 2 '' (FIG. 5) or 2 '' then adhere very well to this additional adhesive tape 70 6).

The additional tape 70, which is glued directly onto the wavy drum - see FIG. 8 - is relatively wide, as can be seen from FIG. 3, so that all narrow adhesive strips 6, 7 can adhere to it. This additional adhesive tape 70 has an adhesive layer with very strong adhesiveness, so that in the splice process, in which the start of the new web, ie the spool A, is connected to the end of the old web D at high speed, this additional adhesive tape together with the narrow adhesive tape 6, 7 sticks to the drum, so it detaches from the main adhesive tape 2.

In Fig. 7 a variant of the tape formation according to Fig. 5 is indicated, here a double-wide adhesive tape is used, which has a strong perforation H in the middle, so that by folding in the direction of arrow F the tape formation after Fig. 5 can generate. For this purpose, the small adhesive strips 6 'and 7' are practically provided, as indicated in FIG. 7. This adhesive tape is to be provided on the adhesive side completely with cover films divided in the longitudinal direction, as indicated. The design of the cover foils in this case also corresponds to that of FIG. 5.

These are relatively large adhesive surfaces, which belong to the cover foils 4, 5, 4 ', 5' or 4 '', 5 '', for the connection of the moving webs later in the splice device (for so-called "flying splice ").

A protruding tail 90 of the beginning of the paper C, which arises if the adhesive tape is not adhered exactly to the - otherwise absolutely straight - axial web edge, can subsequently, e.g. easily separated by hand along the adjacent axial edge of the remaining cover sheet 4, 4 ', e.g. be demolished.

It is conceivable that the belt configurations according to FIGS. 1 and 4 to 7 can be manufactured in the factory and are therefore commercially available. In this case, the previously described method is simplified, as will be explained below.

In the case of FIG. 2, the adhesive tape 1 or 2 is not stuck onto the loop G, but directly onto the web winding A, for example partially onto the following turn B, with the narrow adhesive strip 7 or - if there are several - with the Adhesive strips 7, 8 or 10 or with appropriate adhesive films, which are applied to the back of the adhesive tape 2. Existing cover foils 8, 8 'or 8''are of course removed beforehand. The loop G to be formed is so large that, after the loop has been loosened, the beginning of the web C according to FIG. 2 can still be adhered well to the adhesive tape at the point removed from the cover film 5. There must even survive a certain end as a "tail" 90, which is then preferably removed by hand, for example by tearing off this "tail" along the edge of the adhesive layer or the cover film 4 which is still present. In this way one has a very simple method of producing the splice point without the need for complex equipment. It is of course possible to provide a simple device with a linear guide to attach the tapes to the web wrap. One can also do without forming a loop G, but instead, according to FIG. 2, one can simply let the loose web end hang down vertically.

In FIG. 2, however, it is indicated by dash-dotted lines that the tape 1 can also be glued onto the loop G from the outside.

FIG. 9 shows in principle how the method just described can also be used very well in a rewinding device for a web reel, namely by stopping the new web reel (ie of course simultaneously also the old one) during the rewinding process. The adhesive tape 1 or one according to the other configurations of FIGS. 4 to 7 is then, as it were, adhered to the web reel with the “rear side”, as indicated by the arrow 1. The front is then the side which preferably carries the continuous adhesive layer with the cover foils 4 and 5 or 4 'and 5' or 4 '' and 5 ''. One cover film, 5 or 5 'or 5''in the examples, is first removed. Then, according to the direction of rotation indicated by the round arrow, the web roll is rotated further until the belt 1 the press point in the press nip between the press roll 71 and the Has happened. During this pass, the - later - web start C is fixed to the web roll A by means of the adhesive tape 1. Before or only afterwards, you can use the knock-off knife indicated at 72 to separate the new web reel from the old reel 73. The protruding "tail" of the new web roll A is then - as previously described - preferably separated by hand along the joint of the cover foils 4 and 5. As I said, the cover film 4 generally still remains on the adhesive tape, since this is only removed when the splice connection is finally made during the processing of the web windings.

This method can also be modified by placing the front of the adhesive tape - that is, after removing one of the cover film parts 4 or 5, 4 'or 5', 4 '' or 5 '' - on the web end in the area of the Pressure roller 71 sticks on, then optionally pulls off the cover foils 8, 8 ', 8' 'of the smaller adhesive strips 6 or 7 or 10 and by means of these adhesive strips the tape and thus the end of the web, ie basically the new web start C sticks to the new web reel A, which can be done by turning the new web reel A a little further in the winding direction so that the adhesive tape passes the pressing point between the pressure roller 71 and the new web reel A.

10, a reel spool 80 is outlined in principle, in which a bearing plate 82 is provided on a frame 81 for the winding tube after 83 of the winding tube 84 of the spool A. On the frame 81 there is a substantially horizontal bracket 85 perpendicular to the winding axis or circumferential surface of the spool A on both sides of the spool A. In this case it is supported by a holding bar 87 which has a guide in which the bracket 85 is vertically displaceable. The brackets 85 carry a guide rail 86, which can be displaced in the horizontal direction in guides 88 A cassette or other roll-off device for adhesive tapes or adhesive strips is displaceable on the guide rail and can be stored in a manner that can be guided along the axis of the spool A. As indicated by dash-dotted lines, an essentially radial bracket 85 'arranged with respect to the winding axis can also be provided on both sides of the spool on the spool carriage for the guide rail 86. It is not shown here that the cassette or the unwinding device for the adhesive tapes can be guided with a resilient holder on the guide rail 86, that is to say, for example, that the cassette is connected via a spring arrangement to a slide which slides in the guide 89 of the guide rail 86 could be.

FIG. 11 shows how the cassette K can be held in the guide rail 86 by means of a slide 91 and a holding rail 92 and can be guided along the same. Here, the holding rail 92 is held on the slide by springs 93 and retaining bolts 94. The bolts 94 are screw bolts, and thus the holding rail 92 together with the cassette can be exchanged according to a certain cassette width. For this purpose, a holding plate 95 is used, which can be fastened to the holding rail 92 with wing nuts 97. It is also shown that the cover film can be separated from the adhesive tape roll R by means of a narrow, thin web 96 during the unrolling of the adhesive tape roll.

13 shows a device for facilitating the attachment of the adhesive tape 1 at the end C of the web. A swivel frame 22 is provided which carries at its upper end a guide and holding roller 13 mounted on bearings 33. This holding roller is a hollow cylinder with jacket bores 34, which are connected to the negative pressure to be generated in the interior of the holding roller 13 with respect to the atmosphere. As a result, the web C is held on the holding roller 13. Beneath the holding roller 13 is a work table 14 at a bearing 20 pivotable pivot lever 15 attached and carries a worktop 16. The pivot lever can be pivoted by a hydraulic lifting element 29 by means of its lifting rod 30 in the position shown in dash-dotted lines, in which the working surface 16 rests on the outer surface of the holding roller 13. The hydraulic lifting element 29 is held on a bearing device 32 in the swivel frame 22. The swivel frame can in turn be swiveled by means of a hydraulic lifting element 21 which is fastened on the one hand by means of bearing element 24 in a base plate 19 and on the other hand by means of bearing element 23 on the swivel frame. The swivel frame can in turn be pivoted on the base plate 19 in the bearing 27.

14, the work table 14 with the worktop 16 is shown enlarged. This worktop has a series of holding elements (holding pins) 25, with the aid of which the pieces of adhesive tape can be aligned on the worktop 16. Furthermore, the worktop still has holes 26. Since the work table 14 is designed as a hollow box, which can be placed under negative pressure with respect to the atmosphere by means of connection 41, this negative pressure becomes effective through the bores 26 and holds the pieces of adhesive strip on the worktop 16 so that they swivel upwards when they are swung up the holding roller 13 cannot fall down.

The adhesive tape, that is to say the pieces of the adhesive tape, is laid down on the worktop according to the shape of FIG. 1 and is thus attached to the end of the web C when the work table 14 is swung up. When the guide and holding roller 13 or the reel A rotates, the end of the web C is guided into the tacking position with respect to the reel A. The cover film 8 of the narrow adhesive strip 7 is removed beforehand.

In Fig. 14 it is shown that the worktop has a tear edge 18 which corresponds to the splice edge of the web end C. In the dash-dotted position of the work table 14 of FIG. 4, this edge can be produced by tearing off the excess paper from the end of the web.

Of course, other additional devices are also conceivable which enable the web to be cut off in the form shown.

16 shows the position of the adhesive tape 1 in which it is attached by the work table 14 to the end of the web of FIG. 4. FIG. 15 shows a device of the guide roller 13 which does not have the work table 14 of FIG. 13. Instead, a fixed worktop 17 is provided, which is attached to the swivel frame 22 '. Here the adhesive tape 1 or the pieces of the same is applied directly to the end of the web C.

17, the work table 50 is designed as a box which is approximately square in cross section. The work surface on which the adhesive strips are laid down is indicated by 16 '. The interior of the box is hollow and is preferably under a vacuum from the atmosphere, at least in part, at least in the area where the work surface 16 'is located. For this purpose, a connection 41 similar to the embodiment according to FIG. 14 is to be provided (indicated here by 41 '). Holes 26 are also provided on the work surface as in the embodiment according to FIG. 14. For a serrated splice connection according to Fig. 14, the fixing pins 25 are also to be provided, which are of course retractable, e.g. by loading by means of a spring.

The end of the web of material hangs over the holding roller 13 in accordance with the line shown in broken lines. First, the work table 50 is pivoted into a position in which the Cut 54 the end of the web cuts according to a provided splice edge. For this purpose, the outer surface of the holding roller 13 is preferably rubberized. The adhesive strips which have been laid down on the work surface 16 'are held in place by the negative pressure and, after the work table 50 has been pivoted away, are rotated by means of a swivel arm 15' into a position in which the work surface 16 ', as shown in the figure, is exactly opposite the holding roller 13 . The adhesive strips can then also be attached in a zigzag shape to the end of the web by a controlled pivoting movement of the work table 50. This pivoting movement can be accomplished either by means of a stepper motor or by means of hydraulic elements corresponding to elements 21 and 29 according to FIG. 9 with the aid of limit switches. The swivel frame corresponds essentially to that of Figure 9 and is designated here with 22 ''.

In Fig. 18 the work table is designed as a roller 52 formed by a hollow cylinder. It also has the cutting edge 54. The work surface is to be thought of in a position comparable to that in the case of the work table of FIG. 8. Here, too, the roller 52 forming the work table must have a swivel or rotary drive for a certain swivel or rotary movement.

The bending moment of resistance of the holding roller 13 is preferably substantially greater than that of the work table 16, 50 or 52.

Claims (4)

1. A method for joining the start of a web of a reel (A) at a splice point to the end of a web uncoiling from another reel, with an adhesive tape (1) which has an adhesive layer on one side, characterised in that the adhesive tape (1) is glued to the inner side, relative to the reel (A), of the start of the web and projects with its adhesive layer in the peripheral direction beyond the start of the web and has on its rear side at least one auxiliary adhesive strip (6, 7; 6', 7'; 10) which is provided on either side with an adhesive layer and - when the outermost web winding is taut - as adhesive tape (1) adheres securely to the reel of web at the end of the outermost web winding and wherein the end of the web of one reel is joined to the part of the adhesive tape of the other reel (A) which projects with its adhesive layer beyond the beginning of the web and furthermore the auxiliary adhesive strip (6, 7; 6', 7'; 10) upon the joining of the webs adheres to the other reel (A) and not to the adhesive tape (1).
2. A method according to Claim 1, characterised in that the thickness of adhesive of the auxiliary adhesive strip (6, 7; 6', 7'; 10) on the side facing the reel (A) is substantially thicker than on the side facing the adhesive strip (2).
3. A method according to Claim 1 or 2, characterised in that an additional adhesive tape (11) is attached to the adhesive tape (2') by means of the auxiliary adhesive strip (6', 7'), the single adhesive layer of which additional tape is arranged on the reel side and the adhesive tape (11) and the auxiliary adhesive strip (6', 7') adhere to the other reel (A) and not to the adhesive tape (2') upon joining the webs.
4. A method according to Claim 3, characterised in that the additional adhesive tape (11) is formed by folding over a correspondingly wide adhesive tape (2).

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