CA2303506A1

CA2303506A1 - Process for preparing a paper reel for flying reel change and apparatus for carrying out the process

Info

Publication number: CA2303506A1
Application number: CA002303506A
Authority: CA
Inventors: Walter Brandli; Cornelis Heijkoop; Karl-Heinz Ruede
Original assignee: VR Systems AG
Current assignee: VR Systems AG
Priority date: 1999-03-31
Filing date: 2000-03-30
Publication date: 2000-09-30
Also published as: EP1041025A2; EP1041025A3; KR20010014667A

Abstract

For the substantially or fully automatic preparation of a paper reel (1) for the flying reel change by means of an adhesive tape (4) consisting of an outer tape and an inner tape separable therefrom, a section of the paper web (2) is unwound from said paper reel on an unwind table (17) and its end region is fixed on the inner surface by means of a vacuum on a horizontal first flap (20) and is cut from the outside. After fixation on the outer surface on a second horizontal flap (22), likewise by means of a vacuum, the first flap (20) is swivelled away and the adhesive tape (4) is applied to the inner surface of the web section in such a way that a part of its outer adhesive surface sticks to the inner surface of the web section and an adjacent part projects for subsequent adhesive bonding to the paper web of a residual roll. At the same time, an inner adhesive surface is exposed and, during the subsequent rewinding of the web section onto the paper reel (1), is pressed by a cylinder brush (43) against the next lowest layer and is adhesively bonded thereto.

Description

~

D E S C R I P T I O N
PROCESS FOR PREPARING A PAPER REEL FOR FLYING REEL
CHANGE AND APPARATUS FOR CARRYING OUT THE PROCESS
Field of the invention The invention relates to a method for preparing a paper reel for flying reel change according to the precharacterizing clause of Claim l and an apparatus for carrying out the process, according to the precharcterizing clause of Claim 8. Such processes and apparatuses are used in reel cellars of printing works.
Prior art It is known that paper reels can be prepared for flying reel change by using an adhesive tape which joins the web end edge to the next lowest layer and at the same time has, on the outer surface of the paper reel, an adhesive surface for adhesive bonding to the remainder of the reel (cf. for example DE-A-43 39 309). Recently, adhesive tapes of this type have become available (for example, so-called Flying Splice System 551 from ASS-Etikett GmbH), which consist of an outer tape and an inner tape which are arranged one on top of the other and are separably connected. The inner tape is provided with an inner adhesive surface for joining to the next lowest layer, while the outer tape has an outer adhesive surface for joining to the web end and the remainder of the reel.
It is known that such an adhesive tape can be applied by first joining it below the web end edge to the next lowest layer by pressing on the inner adhesive surface and then ~

r pressing the web end edge onto the outer adhesive surface.
This process requires prior determination of the exact position of the web end edge on the next lowest layer and is therefore relatively complicated and difficult to automate.
Known processes for applying conventional tapes which avoid this difficulty by unwinding a web section from the paper reel, applying the adhesive tape to the web end edge and then rewinding the paper web and joining the adhesive tape to the next lowest layer, and corresponding apparatuses (cf.
DE-C-195 40 689), cannot be directly adopted since there the adhesive tape is applied to the outer surface of the paper web, which is not possible in the case of adhesive tapes of the new type. This also applies to other similar cases where the joint between the web end edge and the next lowest layer is produced by means of a separate so-called fastening strip, whereas, for producing the joint with the paper web of the remainder of the reel, a double-sided adhesive tape is applied to the outer surface of the paper web, just before the web end edge (DE-C-39 18 552). Consequently, adhesive tapes of the new type can at present be applied to the paper reel only manually in the reel stand or in a similar holding device.
Summary of the invention It is the object of the invention to provide a process by means of which adhesive tapes of the new type described above can be applied in a simple manner, where possible fully automatically, to the paper reel. This object is achieved by the features in the characterizing clause of Claim 1. It is also intended to provide an apparatus which is suitable for carrying out the process. This object is r achieved by the features in the characterizing clause of Claim 8.
The advantages achieved by the invention are in particular that the process can be carried out simply and without visual inspection and is therefore suitable for automation.
Particularly by means of said apparatus, reel preparation can be carried out very simply and substantially - if desired also completely - automatically.
Brief description of the drawings Below, the invention is explained in more detail with reference to Figures, which merely represent embodiments.
Fig. 1 shows a plan view of a paper reel prepared for a flying reel change according to a first embodiment of the process according to the invention, Fig. 2 shows a plan view of a paper reel prepared for a flying reel change according to a second embodiment of the process according to the invention, Fig. 3a shows a partial section through a paper reel along III-III in Fig. 1 or 2 during a phase of the flying reel change, Fig. 3b shows a partial section corresponding to Fig. 3a with a paper web taken off from a residual reel, during a further phase of the flying reel change, Fig. 4 shows a partial section along IV-IV in Fig. 2, A

Fig. 5 shows, schematically and in simplified form, a plan view of an apparatus according to the invention for carrying out the process according to the invention, in a starting position, Fig. 6 shows a partial elevation of the apparatus according to Fig. 5, Fig. 7 shows a side elevation of the apparatus according to Fig. 5, 6 during a first phase of the preparation of the paper reel for the flying reel change, Fig. 8a shows a partial elevation corresponding to Fig. 6 during a second phase of the paper reel preparation, Fig. 8b shows a side elevation corresponding to Fig. 7 during the second phase of the paper reel preparation, Fig. 9a shows a partial elevation corresponding to Fig. 6 during a third phase of the paper reel preparation, Fig. 9b shows a section of a side elevation corresponding to Fig. 7 during the third phase of the paper reel preparation, Fig. 10 shows a section of a plan view corresponding to Fig. 5 after completion of the third phase of the paper reel preparation, Fig. lla shows a partial elevation corresponding to Fig. 6 during a fourth phase of the paper reel preparation, Fig. llb shows a section of a side elevation corresponding 5 to Fig. 7 during the fourth phase of the paper reel preparation, Fig. 12a shows a partial elevation corresponding to Fig. 6 during a fifth phase of the paper reel preparation, Fig. 12b shows a section of a side elevation corresponding to Fig. 7 during the fifth phase of the paper reel preparation, Fig. 13a shows, on an enlarged scale, a section of a partial elevation corresponding to Fig. 6 during a first part-phase of the sixth phase of the paper reel preparation, Fig. 13b shows, on an enlarged scale, a section of a side elevation corresponding to Fig. 7 during a first part-phase of the sixth phase of the paper reel preparation, Fig. 14a shows a section corresponding to Fig. 13a during a second part-phase of the sixth phase of the paper reel preparation according to a first embodiment of the process according to the invention, Fig. 14b shows a section corresponding to Fig. 13b during the second part-phase of the sixth phase of the paper reel preparation according to the first embodiment of the process according to the invention, Fig. 15a shows a section corresponding to Fig. 13a during a third part-phase of the sixth phase of the paper reel preparation according to the first embodiment of the process according to the invention, Fig. 15b shows a section corresponding to Fig. 13b during the third part-phase of the sixth phase of the paper reel preparation according to the first embodiment of the process according to the invention, Fig. 16 shows a side elevation corresponding to Fig. 7 during a seventh phase of the paper reel preparation, Fig. 17a shows a section of a partial elevation corresponding to Fig. 6 during an intermediate phase of the paper reel preparation according to a second embodiment of the process according to the invention, Fig. 17b shows a section of a side elevation corresponding to Fig. 7 during the intermediate phase of the paper reel preparation according to the second embodiment of the process according to the invention, Fig. 18a shows a section corresponding to Fig. 13a during the sixth phase of the paper reel preparation according to the second embodiment of the process according to the invention, ' Fig. 18b shows a section corresponding to Fig. 13b during the sixth phase of the paper reel preparation according to the second embodiment of the process according to the invention, Fig. 19 shows a side elevation of a part of an apparatus according to the invention, in a modified embodiment, Fig. 20a shows a partial elevation of the apparatus according to the modified embodiment during the fourth phase of the paper reel preparation, Fig. 20b shows a section of a side elevation of the apparatus in the modified embodiment during the fourth phase of the paper reel preparation, Fig. 21a shows a section of a partial elevation of the apparatus in the modified embodiment during the sixth phase of the paper reel preparation and Fig. 21b shows a section of a side elevation of the apparatus in the modified embodiment during the sixth phase of the paper reel preparation.
Description of the preferred embodiments A paper reel 1 prepared for the flying reel change in the reel stand of a printing press comprises a paper web 2, which is usually wound on a reel core of cardboard. The end of the paper web 2 forms a web end edge 3 which is, for example, essentially straight and slightly skew to the longitudinal direction of the paper web 2. The web end edge 3 is joined to the next lowest layer of the paper web 2 by means of an adhesive tape 4 which extends at least approximately over its total length and also serves for joining the paper reel to the residual reel.
As is evident from Fig. 3a, b, the adhesive tape 4 consists of an inner tape 5 and an outer tape 6 which in this case is slightly narrower, said inner tape and said outer tape resting one on top of the other and being separably joined.
The join which extends over the total inner surface of the outer tape 6 is ensured by adhesive bonds at points distributed over the total said inner surface. The outer tape 6 may comprise a strip of metal foil, e.g. aluminium foil, which can be detected by a detector.
The inner surface of the inner tape 5 forms an inner adhesive surface 7 of the adhesive tape 4 with initial adhesion in the customary range, which is bonded to the next lowest layer of the paper web 2, while the outer surface of the outer tape 6 forms an outer adhesive surface of the adhesive tape 4 with high initial adhesion, by means of which an edge strip 8 is bonded, over the total length of the adhesive tape 4, to a strip of the inner surface of the paper web 2 which is adjacent to the web end edge 3, so that said paper web 2 is firmly held by the adhesive tape 4 on the next lowest layer of the paper web 2. Next to the edge strip 8, an adhesive strip 9 adjacent to the web end edge 3 and extending parallel to the edge strip 8 over the total length of the adhesive tape 4 remains free and, during the flying reel change, serves for joining the paper web 2 to a paper web 10 (Fig. 3b) which is taken off from a residual reel.
In the case of the paper reel prepared according to a first embodiment of the process according to the invention (Fig.

1), the adhesive tape 4 is interrupted by a short space.
There, the web end edge 3 has a concave space section 11 where the web edge end 3 approximately follows an sine curve.
In the case of the paper reel prepared according to the second embodiment of the process according to the invention (Fig. 2, 4), the adhesive tape 4 extends without interruption over the total reel width. However, the adhesive strip 9 is covered by a cover sheet 12, for example of paper, with a nonadhesive outer surface, in a section corresponding to the space section 11 in Fig. 1 with respect to position and extension. However, the cover sheet 12 may be perforated at points distributed over its surface, so that an adhesive effect does in fact occur at these points at high contact pressure.
When the paper web 10 comes to the end, the prepared paper reel is caused to rotate until the outermost layer of the paper web 2 has reached a speed which corresponds as exactly as possible to that of the paper web 10. For this purpose, the clamped paper reel is accelerated by means of a driven belt which is pressed against its outer surface. The belt touches the outer surface of the paper web 2 along an all-round contact strip 13 (Fig. 1, 2) which crosses the web end edge 3 in the region of the space section 11 or of the cover sheet 12 so that adhesion of the adhesive strip 9 to the belt cannot occur. During this phase, the adhesive tape 4 holds the web end edge 3 firmly on the next lowest layer and prevents unwinding of the paper web 2.
When the paper reel 1 has reached the required speed, the paper web 10 is caused to approach it until contact occurs.
As soon as the outer surface of the paper web 10 comes into a contact with the adhesive strip 9 in the course of the rotation of the paper reel 1 (Fig. 3b), it is adhesively bonded to it immediately and carries the outer tape 6 with it, said outer tape 6 being separated from the inner tape 5.
5 Since it is adhesively bonded by the edge strip 8 to the outer tape 6, the paper web 2 is likewise carried along.
The paper web 2 and the paper web 10 are thus joined by the outer tape 6 by virtue of the fact that the inner surface of the former is adhesively bonded to the edge strip 8 and the 10 inner surface of the latter is adhesively bonded to the adhesive strip 9 adjacent to said end strip 8, which edge strip and which adhesive strip together form the outer adhesive surface. The inner tape 5 remains adhering to the next lowest layer of the paper web 2. Its outer surface, like the inner surface of the outer tape 6, no longer exhibits any adhesive effect, so that there is no danger of undesired adhesion and consequent web winding.
The paper web 10 is now cut by means of a knife and is separated from the residual roll. The flying reel change is thus complete.
The apparatus for preparing the paper reel comprises, in its basic design (Fig. 5-7), a lifting apparatus 14 having two cones l5a,b which are displaceable towards one another and can be introduced into the ends of the core of the paper reel 1, which is brought, for example on a reel bogie 16, to the apparatus, and thus serves as a holding apparatus for the paper reel 1. Arranged above the lifting apparatus 14 is an unwind table 17 which is horizontal or slopes slightly downwards at the back and has a conveyor device which preferably has closed belt-like or string-like conveying means 18 which extend in the longitudinal direction, said unwind table forming a support surface 19 pointing upwards.
A first flap 20 which can be swivelled downwards out of a horizontal position about a first axis of rotation passing transversely just below the support surface 19 is mounted at the rear end of the unwind table 17. Said flap 20 carries a first adhesion surface 21 which, when the first flap 20 is in a horizontal position, is in a position of use in which it points upwards. A second flap 22 can be swivelled back upwards from a horizontal position about a second axis of rotation located just above the support surface 19 and parallel to the first axis of rotation. Said flap 22 carries a second adhesion surface 23 which, when the second flap 22 is in the horizontal position, is present in a position for acceptance and use, in which position it points downwards. A
vacuum can be applied to each of the adhesion surfaces 21, 23, up to a point close to their edge. The second flap 22 is bounded by a slightly skew rear edge which, when both flaps are in the horizontal position, is above a skew plastics strip 24 which interrupts the first adhesion surface 21.
Furthermore, the apparatus (Fig. 9a, b) has a cutting apparatus 25 which is arranged above the rear edge of the first flap 20. It comprises a transverse rail 26 from which a short longitudinal rail 27 is suspended so as to be transversely displaceable, and which longitudinal rail 27 in turn carries a knife 28 which is pivotable about a perpendicular axis and has a driven cutting disc 29. The cutting apparatus 25 can be displaced along a cutting line (Fig. 10) which essentially follows the rear edge of the 30 second flap 22 and runs over the plastics strip 24.

Moreover, the apparatus comprises an adhesion apparatus 31 (Fig. l3a,b) which is displaceable by a linear module 32 along the cutting line 30. It comprises a storage roll 33 for holding the adhesive tape 4, whose inner adhesive surface 7 in this case is still covered by a cover tape 34, a take-up roll 35 which is arranged adjacent to said storage roll 33 and is intended for taking up the cover tape 34 and, between said rolls, a guide roll 36 and a pressure roll 37 retractable from the shown position for use and a pair 38 of pinch rollers. A tape holder 39 which is slightly displaceable in the perpendicular direction is arranged behind the pressure roll 37. In addition, a scissors-like cutting device 40 which comprises two horizontal blades, a fixed blade 41 and a blade 42 pivotable about a vertical axis, is additionally provided approximately at the height of the pressure roll 37.
Finally, the apparatus (Fig. 16) has a drivable cylinder brush 43 which is mounted slightly in front of and above the support surface 19 and whose bristles are produced from hairs of horses' manes.
The apparatus as described above is suitable for paper reel preparation according to a first embodiment of the process according to the invention, as described below:
In the position which is shown in Fig. 7 and in which the paper reel 1 - it may also have a width other than the 1/1 width shown, the apparatus automatically adjusting to this -just touches the front edge of the unwind table 17, a web section 44 is unwound (Fig. 8a, b) by rotating said paper reel in the direction of the arrow and is transported by the conveying means 18 towards the rear end of the unwind table 17 so that it extends not only over the total length of the support surface 19 but also over the first adhesion surface 21, over the end of which it projects to a greater or lesser extent. The first flap 20 is in a horizontal position with the first adhesion surface 21 in a position for use, while the second flap 22 is swivelled up into a perpendicular position. The first adhesion surface 21 is then switched on, i.e. a vacuum is generated at said adhesion surface 21, by means of which vacuum the inside of the web section 44 is held firmly against the first adhesion surface 21.
Thereafter (Fig. 9a,b), the cutting apparatus 25 is used and the knife is moved along the cutting line 30, the cutting disc 29 being pressed against the plastics strip 24 and cutting off an end section from the web section 44. The web end edge 3 (Fig. 10) with the space section 11 is thus produced. The knife 28 is guided during the cut in such a way that the axis of the cutting disc 29 is always perpendicular to the instantaneous cutting direction, i.e.
also while the space section 11 is being produced.
After the end section has been cut off, the second flap 22 is (Fig. lla,b) swivelled into the horizontal position, and the second adhesion surface 23 is thus brought into a position for acceptance and use and is switched on, so that, by means of a vacuum, it firmly holds the outside of that part of the web section 44 which is adjacent to the web end edge, the web end edge 3, apart from the space section 11, exactly coinciding with the rear edge of the second flap 22.
On the other hand, the first adhesion surface 21 is switched off and the first flap 20 is swivelled downwards (Fig.
l2a,b). The end section which has been cut off falls off.
The adhesion apparatus 31 is (Fig. l3a,b) then used by a procedure in which, beginning at a lateral edge of the web section 44, the edge strip 8 of the outer adhesive surface of the adhesive tape 4 is pressed by means of the pressure roll 37 against that strip of the inside of the web section 44 which is adjacent to the web end edge 3, the edge region of the second adhesion surface 23 serving as a firm support which prevents said strip of the web section 44 from deviating, while the remaining part of the outer adhesive surface, the adhesive strip 9, remains free. While the adhesion apparatus 31 is moved along the web edge 3, adhesive tape 4 is unwound from the storage roll 33 and is applied, as described, to the inside of the web section 44.
At the same time, the cover tape 34 is peeled off from the adhesive tape 4 on the pressure roll 37 and is wound on the take-up roll 35, with the result that the inner adhesive surface 7 of the adhesive tape 4 is exposed.
When the edge of the space section 11 is reached, the pressure roll 37, which is mounted on a pivotable lever, is (Fig. l4a,b) retracted while the adhesive tape 4 is pressed on by the tape holder 39 so that said adhesive tape cannot become detached again from the web section 44. The cover tape 34 is taken up so that it remains tensioned. The pivotable blade 42 of the cutting device 40 is then swivelled towards the fixed blade 41 thereof and the adhesive tape 4 is cut between the pressure roll 37 and the tape holder 39. Finally, that small residual section of the adhesive tape 4 which is not yet joined to the web section 44 is pressed on by the tape holder 39 while the adhesion apparatus 31 is moved further until it reaches the edge of the space section 11. The tape holder 39 is then slightly lowered.
The adhesion apparatus 31 is then moved up to the opposite edge of the space section 11. There, the pressure roll 37 is (Fig. l5a,b) brought back to the position for use, and the adhesive tape 4 is thus again pressed against the web section 44. With a further supply of the adhesive tape 4, the adhesion apparatus 31 is now moved, as described further 5 above, up to the lateral edge of the web section 44, where the adhesive tape 4 is again cut.
Finally, the second adhesion surface 23 is switched off and (Fig. 16) the web section 44 is withdrawn from the support surface 19 by rotating the paper reel 1 in the direction of 10 the arrow with corresponding movement of the conveying means 18 and is wound back onto the paper reel 1. The inner adhesive surface 7 of the adhesive tape 4 is pressed against the next lowest layer by the action of the cylinder brush 43 rotated in a direction opposite to the direction of rotation 15 of the paper reel 1. Since the inner adhesive surface 7 of the adhesive tape 4 has initial adhesion only in the customary range, i.e. does not adhere very rapidly, there is no danger of adhesion to the support surface 19 on withdrawing the web section 44. However, with a suitable design of the cylinder brush 43 - for example as described further above - no difficulties occur on the outer adhesive surface either, in spite of its high initial adhesion. The prepared paper reel 1 can now be stored on the reel bogie 16 by means of the lifting apparatus 14.
If it is intended to prepare the paper reel 1 according to the second embodiment of the process according to the invention, it is advantageous to provide additional devices for automatic application of the cover sheet 12.
Accordingly, a lay-down apparatus 45 is (Fig. l7a,b) provided and comprises a cover sheet container 46, arranged adjacent to the unwind table 17 and intended for holding a stack of cover sheets 12, and a lay-down device 47 having a suction plate 48 which is provided with suction cups and can be moved from the cover sheet container 46 to a cover sheet holder 49 which is displaceably suspended from the second flap 22, along the rear edge thereof, for permitting adjustment to various reel widths. Said cover sheet holder forms a cover sheet adhesion surface 15 which adjoins the second adhesion surface 23. On the other hand, the knife 28 need not be pivotable about a perpendicular axis since no space section is produced and the cutting line is therefore straight. The suspension of the knife 28 can in certain circumstances also be simplified in other ways.
In carrying out the process according to the second embodiment, which otherwise corresponds to the process according to the first embodiment, after the end section has been cut off or while it is being cut off, with the second flap 22 completely swivelled back (Fig. l7a,b), the suction plate 48 of the lay-down device 47 is moved to the cover sheet container 46, where it picks up a cover sheet 12. It is then moved to the cover sheet holder 49, where it places the cover sheet 12 on the cover sheet adhesion surface 50, where it is firmly held by means of a vacuum. The application of the adhesive tape 4 is then effected (Fig.
l8a,b) essentially as described further above. However, there is no interruption of tape application. At the point where the cover sheet 12 is subsequently held against the web end edge 3 on the cover sheet adhesion surface 50, the adhesive strip 9 is pressed against its underside so that the cover sheet 12 adheres thereto.
The two embodiments of the process according to the invention differ only in the manner in which adhesion of the belt with which the prepared paper reel is brought to the required speed is prevented. It is of course possible to design the apparatus in such a way that this can take place both in the first manner and in the second manner by both suspending the knife in a pivotable manner with a view to producing the space section and providing a lay-down apparatus and a cover sheet holder.
Also, it is possible to cause the paper reel to rotate by drivable cones in the reel stand, i.e. without the use of a belt, in which case the measures described are not required and the apparatus can be designed in a correspondingly simpler manner. On the other hand, it is also possible to provide a plurality of parallel belts for driving the paper reel, in which case of course a plurality of spacees or cover sheets must also be provided.
In a modified embodiment of the process according to the invention, the web section 44 is bent back upwards by about 180° after production of the web end edge 3, and the adhesive tape 4 is then applied. The application of the adhesive tape 4 is then effected from above, which facilitates the procedure, especially if it has to be carried out manually, for example owing to a fault.
In a modified apparatus adapted to this embodiment of the process according to the invention, the second flap 22' has (Fig. 19) a guide surface 51 to which the second adhesion surface 23 is adjacent. The guide surface 51 has the shape of a sector of a lateral cylinder surface, whose axis coincides with the second axis about which the second flap 22' can be swivelled back. The second axis is displaceable parallel to the support surface 19 and is mounted in such a way that it moves back over the support surface 19 when the second flap 22' is swivelled back by the product of the radius of the guide surface 51 with the angle of rotation in radian measure, as if the guide surface 51 rolled on said support surface 19.
After production of the web end edge 3 by cutting off the web section 44, which is carried out in the same way as already described further above, the second flap 22' is swivelled downwards until the second adhesion surface 23 is in an acceptance position in which it points downwards (Fig.
20a,b). Thereafter, the first adhesion surface 21 is switched off and the second adhesion surface 23 is switched on. The second flap 22' is then swivelled back until the second adhesion surface 23 assumes a position of use which is rotated by 180° relative to its acceptance position. That part of the web section 44 which is adjacent to the web end edge 3 rests closely, but without tension, around the guide surface 51, so that no tension is applied to that part of the web section 44 which rests on the support surface 19 and to the paper reel.
The application of the adhesive tape 4 is effected (Fig.
2la,b) in principle in exactly the same manner as already described in detail further above. It is thus possible to proceed according to both embodiments described. However, the application of the adhesive tape 4 is effected not from below but from above. This facilitates monitoring of the position of the adhesive tape 4. In particular, however, its application is substantially simpler if it has to be performed manually, for example because of a failure or a fault of the adhesion apparatus 31. After application of the adhesive tape 4, the second flap 22' is always swivelled back again by 180° so that the second adhesion surface 23 once again assumes its acceptance position. After it has been switched off, the procedure is continued in the same manner as already described further above, and the preparation of the paper reel is completed.
In addition, some other modifications of the process according to the invention and of the apparatus according to the invention are possible. Thus, the web end edge can be prepared differently to the manner described, for example so that it is not skew but perpendicular to the longitudinal direction of the paper web 2. The unwind table may have a surface of low-friction material, such as, for example, Teflon~, instead of conveying means. The cutting apparatus may have a cutting stylus or a rotating knife instead of a cutting disc. Crimp cutting or laser cutting is also possible.
List of reference symbols 1 Paper reel 2 Paper web 3 Web end edge 4 Adhesive tape 5 Inner tape 6 Outer tape 7 Inner adhesive surface 8 Edge strip 9 Adhesive strip 10 Paper web 11 Space section 12 Cover sheet 13 Contact strip 14 Lifting apparatus l5a,b Cones 16 Reel bogie 17 Unwind table 18 Conveying means 19 Support surface 20 First flap 21 First adhesion surface 5 22, 22' Second flap 23 Second adhesion surface 24 Plastics strip Cutting apparatus 26 Transverse rail 10 27 Longitudinal rail 28 Knife 29 Cutting disc Cutting line 31 Adhesion apparatus 15 32 Linear module 33 Storage roll 34 Cover tape Take-up roll 36 Guide roll 20 37 Pressure roll 38 Pair of pinch rollers 39 Tape holder Cutting device 41 Fixed blade 25 42 Pivotable blade 43 Cylinder brush 44 Web section Lay-down apparatus 46 Cover sheet container 30 47 Lay-down device 48 Suction plate 49 Cover sheet holder Cover sheet adhesion surface 51 Guide surface

Claims

1. Process for preparing a paper reel (1) with a wound paper web (2) for flying reel change by applying an adhesive tape (4) along a web end edge (3), which has at least one outer tape (6) having an outer adhesive surface for producing the joint between the web end and a paper web (10) of a residual roll and an inner tape (4) which is separable therefrom and has an inner adhesive surface (7) for firmly holding the web end on the next lowest layer, characterized in that a web section (44) of the paper web (2) is unwound from the paper reel (1) and an edge strip (8) of the outer adhesive surface is pressed against the inner surface of the paper web (2), on a strip adjacent to the web end edge (3), in such a way that a remaining adhesive strip (9) of the outer adhesive surface remains free adjacent to the web end edge (3), whereupon the web section (44) is wound back onto the paper reel (1) and the inner adhesive surface (7) is pressed against the next lowest layer of the paper web (2).

2. Process according to Claim 1, characterized in that, during application of the adhesive tape (4), that part of the web section (44) which is adjacent to the web end edge (3) is held firmly on its outside.

3. Process according to Claim 1 or 2, characterized in that the web end edge (3) is produced by cutting off an end section in a controlled manner from the unwound web section (44) along a cutting line (30).

4. Process according to Claim 3, characterized in that, in order to cut off the end piece, that part of the web section (44) which surrounds the cutting line (30) is firmly held on its inside.

5. Process according to Claim 3 or 4, characterized in that the web end edge (3) is produced essentially straight and perpendicular or slightly skew to the longitudinal direction of the paper web (2).

6. Process according to Claim 5, characterized in that the web end edge (3) is provided with at least one short concave space section (11) and that the latter is omitted when applying the adhesive tape (4).

7. Process according to any of Claims 1 to 5, characterized in that at least one short section of the adhesive strip (9) is covered by arranging in each case a cover sheet (12) adjacent to the web end edge (3) before applying the adhesive tape (4).

8. Apparatus for carrying out the process according to any of Claims 1 to 7, comprising a holding apparatus for clamping the paper reel (1), characterized in that it has a support surface (19) arranged on the outside thereof and intended for holding the unwound web section (44) and a switchable first adhesion surface (21) for firmly holding the inner surface of the paper web (2), which continues the support surface (19) in a position for use, a cutting apparatus (25) for cutting off an end section of the paper web (2), which is movable along a cutting line (30) over the first adhesion surface (21), and a switchable second adhesion surface (23) for firmly holding the outer surface of the paper web (2), which, at least in an acceptance position, is opposite the first adhesion surface (21), while its edge at least essentially follows the cutting line (30), and an adhesion apparatus (31) for applying the adhesive tape (4) which, while it is in a position for use, can be moved along the edge of the second adhesion surface (23), over said adhesion surface.

9. Apparatus according to Claim 8, characterized in that the support surface (19) is aligned approximately horizontally.

10. Apparatus according to Claim 9, characterized in that the support surface (19) is arranged above the holding apparatus, and the first adhesion surface (21), in its position for use, is in the plane of the support surf ace (19).

11. Apparatus according to any of Claims 8 to 10, characterized in that a vacuum for firmly holding the paper web (2) can be generated in each case at the first adhesion surface (21) and at the second adhesion surface (23).

12. Apparatus according to any of Claims 8 to 11, characterized in that the first adhesion surface (21) consists of plastic in the region of the cutting line (30).

13. Apparatus according to any of Claims 8 to 12, characterized in that the first adhesion surface (21) is arranged on a first flap (20) which can be swivelled back out of its position for use about a first axis at the end of the support surface (19).

14. Apparatus according to any of Claims 10 to 13, characterized in that the position for use of the second adhesion surface (23) coincides with its acceptance position.

15. Apparatus according to Claim 14, characterized in that the second adhesion surface (23) is arranged on a second flap (22) which can be swivelled back out of its position for use about a second axis slightly offset perpendicularly to the support surface (19).

16. Apparatus according to any of Claims 10 to 13, characterized in that the second adhesion surface (23), in its position for use, is rotated relative to the acceptance position, preferably by about 180°.

17. Apparatus according to Claim 16, characterized in that the second adhesion surface (23) is arranged on a second flap (22') which has a round guide surface (51) preceding the second adhesion surface (23) and which, for transferring the second adhesion surface (23) from its acceptance position to its position for use, can be swivelled back about a second axis offset perpendicularly to the support surface (19), with displacement of said second axis, so that the movement of the second flap (22') corresponds approximately to rolling of the guide surface (51) on the support surface (19) about the second axis.

18. Apparatus according to Claim 17, characterized in that the guide surface (51) has the shape of a sector of a lateral cylinder surface.

19. Apparatus according to any of Claims 8 to 18, characterized in that the support surface (19) is formed at least in part by conveying means (18).

20. Apparatus according to any of Claims 8 to 19, characterized in that the cutting apparatus (25) comprises a knife (28) which is pivotable about an axis approximately perpendicular to the first adhesion surf ace (21).

21. Apparatus according to any of Claims 8 to 20, characterized in that the adhesion apparatus (31) comprises a storage roll (33) for the adhesive tape (4), a take-up roll (35) for taking up a cover tape (34) peeled off the inner adhesive surface (7) of the adhesive tape (4), and a pressure roll (37) which is arranged between them and can be retracted from a position for use in which it presses against the edge region of the second adhesion surface (23).

22. Apparatus according to Claim 21, characterized in that it has a cutting device (40) for cutting the adhesive tape (4).

23. Apparatus according to Claim 22, characterized in that the cutting device (40) can be used in the immediate vicinity of the position for use of the pressure roll (37).

24. Apparatus according to Claim 22 or 23, characterized in that the cutting device (40) is formed in a scissor-like manner with two blades (41, 42) which can be moved towards one another.

25. Apparatus according to any of Claims 8 to 24, characterized in that a cover sheet adhesion surface (50) for firmly holding a cover sheet (12) is adjacent to the edge of the second adhesion surface (23).

26. Apparatus according to Claim 25, characterized in that it comprises a lay-down apparatus (45) having a cover sheet container (46) for holding a stock of cover sheets (12) and a lay-down device (47) which can be moved to the cover sheet container (46) and to the cover sheet adhesion surface (50) respectively for picking up and laying down a cover sheet (12).

27. Apparatus according to any of Claims 8 to 26, characterized in that a drivable cylinder brush (43) for pressing the adhesive tape (4) against the next lowest layer of the paper reel (1) is arranged in the region of the holding apparatus.