EP0683122A1 - Pasting means for splicing webs wound into driven rolls - Google Patents

Abstract

The adhesive is formulated to provide both an adhesive and a switching function, the latter giving an indication of the joint to external sensors. Also claimed are the ways in which it is used in various jointing connections. <IMAGE>

Description

The invention relates to an adhesive for connecting webs of material wound on driven rolls, in particular for connecting printing material webs of a web-fed rotary printing press when changing webs on the fly.

In rotary printing machines, the printing material, for example paper, is fed to the printing unit in the form of a printing material web. The printing material web is unwound from a roll that is clamped in a roll changer. The reel changer is upstream of the printing unit. In order to be able to meet the requirement of uninterrupted printing, particularly in newspaper printing, the unrolled one is advantageously replaced by a new printing material web roll in the flying roll change. For this purpose, a reel changer has at least two reels with integrated tensioning devices, in which the running as well as the new substrate web reel are clamped with a prepared adhesive joint. So that the new printing material web roll can be overhung to the web of the running printing material, the new printing material web roll is accelerated by means of a drive device until its peripheral speed corresponds to the web speed of the running printing material web. The reliable connection of the adhesive joint of the new printing material web roll to the end piece of the running printing material web, which is also carried out with a device integrated in the roll changer for covering and capping the running printing material web, is only possible without incorrect gluing or web break if the adhesive joint on the new printing material web roll is more suitable Way has been prepared.

For this purpose, the tear-off force of the adhesive bump from the new printing material web must be so great that the adhesive bump does not become detached during storage in the intermediate roll store, during subsequent transport and loading into the roll changer or when accelerating the new printing material web roll in the roll changer. The location of the adhesive joint on the circumference of the new printing material web should be able to be determined as precisely as possible regardless of its location or the type of loading in the roll changer. The adhesive joint should also be able to be torn off without great effort when re-gluing onto the running printing material web, whereby it should be noted that the web tension distribution remains as uniform as possible over the web width during the wrapping. Finally, the adhesive joint must be able to transmit the occurring web tension value of the connected web width and not tear it off.

After unwinding the printing material web in the roll changer and printing this web in the printing unit or units, the now printed material web is cut lengthwise into individual partial webs before being introduced into the folder. Then, depending on the required product - usually several fabric webs from different roll changers and printing units are involved - the partial webs are brought together via one or more former and, if necessary, folded lengthways. Then the partial web packages which have been brought together to form individual strands are brought together again in the folder, cross-cut and lined up in accordance with the required product on a delivery of the folder in the form of a shingled stream. The web break risks associated with this production process should be avoided or at least reduced.

The connection between the two webs should offer the longitudinal cutting devices the lowest possible cutting resistance; it should be possible to fold it as bulge-free as possible in the area of the former - and it should be able to withstand the web tension that occurs for each partial web.

The printed copies are taken over by a subordinate transport system and transported for further processing or to a forwarding agency. The stream of flakes must be deliberately divided, since the specimens containing parts of glue joints cannot be sold and must therefore be eliminated via a so-called waste switch. Since the glue bumps are normally not visible - they may be covered by several web layers - the excretion is controlled by gluing materials onto the web of material in the area of the glue bump in the area of the glue bump that are detected without contact, for example by means of inductive or capacitive proximity switches can.

In some applications, where either the single strands from the funnels not merged, but processed in parallel - for example in double-fold - or the copies lined up in double-fold in the folder via a so-called split switch into two shingled streams - for example double-three-fold - it must be taken into account that the adhesive splices of the individual printing material webs are separated in the folder and divided into two Expenses are laid out. In such cases, the divided adhesive joints must be detected and eliminated separately before each waste switch. This also happens for switching the waste turnouts in that materials are glued to the web in the area of the adhesive joint in such a way that they can be detected contactlessly, for example by means of inductive or capacitive proximity switches, regardless of the division of the single web over or in the folder.

Finally, when preparing an adhesive joint for a printing material web for the flying roll change, it must also be taken into account that the web widths e.g. enlarge considerably with regard to six plate-wide rotary printing presses in newspaper printing, whereby the basis weight of the web should be kept as small as possible.

EP 0 418 527 A2 discloses an adhesive joint preparation in which a roll start edge is cut off at an angle of less than 90 ° to the side edge of the printing material web, in particular at an angle between 60 ° and 80 °. Then the leading edge of the roll is glued to the next web layer underneath with a connecting strip that spans the entire width of the web. This known connecting strip is divided longitudinally into three zones, of which the zone located above the start edge of the roll is self-adhesive on both sides, the central zone is non-adhesive and the zone sitting on the next layer is self-adhesive on one side. The central zone is provided with a perforation running in the longitudinal direction of the strip. The connecting strip is applied so that the middle, with the perforation provided zone comes to lie along the edge of the roll. The bevelling of the leading edge of the roll improves the tear-off behavior when gluing the new one onto the running substrate.

However, this known method requires a time-consuming preparation of the adhesive joint, because the course of the connecting strip, but in particular the perforation, must exactly match the edge of the web over the entire width of the web. This known type of glue joint formation should also make it necessary for the tensioning device to be zeroed when loading the new printing material web roll with regard to the location of the glue joint or other suitable measures for detecting the adhesive joint must be taken in order to precisely press the new one onto the expiring one Web and a correspondingly synchronized capping of the old printing material web can be guaranteed. Furthermore, this known adhesive joint can only be cut by the longitudinal cutting devices with increased cutting resistance and cannot be folded without bulges in the former.

Another type of adhesive joint preparation is known from EP 0 129 238 A1. The leading edge of the new printing material web, which runs at right angles to the web side edge, is glued to the next layer of this new printing material web with several adhesive strips. The adhesive strips each have an adhesive zone on both sides of a central non-adhesive zone. They are aligned when glued to the start edge and attached so that the middle zone comes to lie above the start edge. After gluing, a perforation is cut in the middle zone by means of an appropriately designed device in order to make it easier for the adhesive strips to be torn open when the beginning of the web is glued onto the running printing material web.

Even with this known role change, it is likely to be the same as above described adjustment of the tensioning device or other measures are necessary to ensure the exact adhesion of the new web to the running web and the synchronized capping of the running web. Subsequent perforation of the adhesive strips is also complex since, on the one hand, the adhesive strips are perforated cleanly and, on the other hand, the underlying sheet layer must not be damaged. Another risk of incorrect gluing and web breakage is that the web-side end of the web start edge and the two outer adhesive strips up to the side edge of the web roll are neither tacked nor cut at an angle.

Furthermore, the use of an approximately T-shaped adhesive strip for preparing an adhesive joint on the starting edge of a printing material web is known, in which the starting edge has the shape of one or more adjacent triangles, at the tips of which such an adhesive strip is used to stick the tips onto the next one Web position is attached. Furthermore, on the topmost layer in the unwinding direction behind the adhesive joint prepared in this way, a further adhesive strip made of an electrically conductive material and aligned exactly with the adhesive joint is applied. The detection of this further adhesive strip by a suitably designed proximity switch triggers the signal for pressing the new one onto the running printing material web and the signal for cutting the running printing material web.

This method is also still complex, since this additional adhesive strip must be attached very precisely with regard to its position in relation to the actual adhesive joint.

The invention has set itself the task of simplifying the preparatory work for connecting two webs of material that are unwound via driven rollers and to ensure that the two webs of material are pressed on as precisely as possible in the region of the adhesive joint.

This object is solved by the subject matter of claim 1.

Claims 12 and 15 are directed to preferred applications of the subject matter of claim 1, while claim 17 relates to a method for preparing an adhesive joint on a roll of a printing material web of a rotary printing press.

The respective subordinate claims relate to advantageous and not smoothly self-evident embodiments of the invention.

According to the invention, in addition to the adhesive function, a switching function is simultaneously integrated in the adhesive for connecting material webs wound on driven rollers. This means that the adhesive and thus the adhesive joint itself can be detected with a suitable agent. This means that there is no need for additional means which have hitherto been necessary to determine the position of the adhesive joint on the outer circumference of the material web. Inaccuracies regarding the relative position of the adhesive joint and the additional means for determining the position of the adhesive joint or the start edge of the web, which can never be completely avoided with the known adhesives and methods for preparing the adhesive joint, no longer occur. Finally, the preparation of the adhesive joint is simplified and therefore cheaper, since at least the additional process step of attaching the means for recognizing the position of the adhesive joint is eliminated. Complicated adjustments of the tensioning device are also not necessary. The term switching function in connection with the adhesive according to the invention means that the adhesive is characterized by its suitability for detection by suitable sensors.

The adhesive can be an independently manageable adhesive strip or can only be formed when the adhesive joint is being prepared, preferably by spraying become.

Although the invention is particularly preferably used to prepare an adhesive joint between a new and a running printing material web of a web-fed rotary printing press, the two webs flying, i.e. be changed during the continuous operation of the machine, the adhesive according to the invention can advantageously also be used in the case of a similarly changing web in other areas, for example for changing plastic webs and films.

Figur 1

eine schematische Darstellung einer Bedruckstoffbahnrolle von 4/4-tel Breite, deren Klebestoß mit einem Klebemittel mit integrierter Schaltfunktion hergestellt ist;

Figur 2

eine Draufsicht auf eine Ausführung des Klebestoßes nach Figur 1 bei manueller Vorbereitung des Klebestoßes;

Figur 3

eine schematische Darstellung von Bedruckstoffbahnen mit maximal vier unterschiedlichen Bahnbreiten, die für den Klebestoß entsprechend der Figuren 1 und 2 ausgebildet sind;

Figur 4

eine schematische Darstellung von Bedruckstoffbahnen mit maximal sechs unterschiedlichen Bahnbreiten, die für den Klebestoß entsprechend der Figuren 1 und 2 ausgebildet sind;

Figur 5

das Aneinanderkleben zweier Bedruckstoffbahnen in einer schematischen Schnittdarstellung;

Figur 6

die Oberseite eines Klebemittels, das als rechteckförmiger Klebestreifen ausgebildet ist;

Figur 7

die Unterseite des Klebestreifens nach Figur 6;

Figur 8

ein zweites Ausführungsbeispiel einer für einen Klebestoß vorbereiteten Bedruckstoffbahnrolle;

Figur 9

eine Draufsicht auf die Ausführung des Klebestoßes nach Figur 8;

Figur 10

eine schematische Darstellung von Bedruckstoffbahnen mit maximal vier unterschiedlichen Bahnbreiten, die für den Klebestoß entsprechend der Figuren 8 und 9 ausgebildet sind;

Figur 11

eine schematische Darstellung von Bedruckstoffbahnen mit maximal sechs unterschiedlichen Bahnbreiten, die für den Klebestoß entsprechend den Figuren 8 und 9 ausgebildet sind;

Figur 12

die Unterseite eines Klebemittels, das als Klebestreifen in T-Form ausgebildet ist zur Vorbereitung des Klebestoßes nach den Figuren 8 bis 11;

Figur 13

eine schematische Darstellung des Anklebens der neuen Bedruckstoffbahn auf die ablaufende alte Bedruckstoffbahn unter Verwendung eines Klebestreifens entsprechend Figur 12;

Figur 14

eine Vorrichtung zum Vorbereiten eines Klebestoßes durch Aufsprühen des Klebemittels auf eine Bedruckstoffbahnrolle; und

Figur 15

das Ankleben der neuen Bedruckstoffbahn von Figur 14 an eine ablaufende alte Bahn.

Preferred exemplary embodiments of the invention are explained with reference to the following drawings. Further features and advantages of the invention are disclosed. Show it:

Figure 1

is a schematic representation of a printing web roll of 4/4-th width, the adhesive joint is made with an adhesive with an integrated switching function;

Figure 2

a plan view of an embodiment of the adhesive joint according to Figure 1 with manual preparation of the adhesive joint;

Figure 3

a schematic representation of printing material webs with a maximum of four different web widths, which are designed for the adhesive joint according to Figures 1 and 2;

Figure 4

a schematic representation of substrate webs with a maximum of six different web widths, which are designed for the adhesive joint according to Figures 1 and 2;

Figure 5

the sticking together of two printing material webs in a schematic sectional view;

Figure 6

the top of an adhesive, which is designed as a rectangular adhesive strip;

Figure 7

the underside of the adhesive strip according to Figure 6;

Figure 8

a second embodiment of a substrate roll prepared for an adhesive joint;

Figure 9

a plan view of the execution of the adhesive joint according to Figure 8;

Figure 10

a schematic representation of printing material webs with a maximum of four different web widths, which are designed for the adhesive joint according to Figures 8 and 9;

Figure 11

a schematic representation of printing material webs with a maximum of six different web widths, which are designed for the adhesive joint according to Figures 8 and 9;

Figure 12

the underside of an adhesive, which is designed as an adhesive strip in a T-shape to prepare the adhesive joint according to Figures 8 to 11;

Figure 13

a schematic representation of the gluing of the new printing material web on the running old printing material web using an adhesive strip corresponding to Figure 12;

Figure 14

a device for preparing an adhesive joint by spraying the adhesive onto a roll of printing material; and

Figure 15

the gluing of the new printing material web from FIG. 14 to an old web running off.

FIG. 1 shows a paper roll as an example for a printing material web roll which has been prepared for insertion in a roll changer of a rotary printing press. After damaged web layers have been removed, the wound printing material web 1 is just cut off at the web start 2 along a web start edge 3 at right angles to the roll side edge 11. By cutting the side edges of the leading edge 3 obliquely at an angle β, the shape of the leading edge 3 has been completed.

FIG. 2 shows an adhesive joint 13 in which the web edge 3 is connected in the middle of partial webs A, B, C and D with an adhesive, namely switching adhesive strip 12, to the next web layer 8 lying under the web edge 3. It should be ensured that a perforation 34 (FIGS. 6 and 7) of the adhesive strips 12 runs approximately along the start edge 3 of the web. The web edge 3 is reinforced with a double-sided adhesive tape 10, which can run along the entire web edge 3 if necessary. The type and form of reinforcement depends on the degree of automation in reel preparation. A full automation of the adhesive joint preparation inside or outside of the roll changer is possible, since after cutting the web edge 3, the adhesive strips 12 can be glued in the correct position to the roll side and web edge 3. If the drive device of the reel changer is equipped with a circumferential drive, for example a drive with belts 22 (indicated in FIG. 3), the adhesive tapes 10 are omitted in the areas in which the circumferential drive 22 acts, or are each covered with a masking tape 14. This is not necessary for reel changers with a pure center drive.

Figure 3 shows a schematic overview of printing material webs with the adhesive joint 13 with a maximum of four possible configurations of partial webs A, B, C and D. The devices 21 for scanning the switching adhesive strip 12 and thus the location of the adhesive joint 13 on the circumference of the new printing material web are like that Adhesive strips 12 are also arranged in the middle of each partial web A, B, C and D. The location of the devices for the peripheral drive 22, the longitudinal section 19 and the former 20 are also indicated schematically. The arrangement of the adhesive strips 12 located in the adhesive joint 13 makes it clear that the adhesive joint can also be detected after the folder independently of the division of the printing material webs into partial webs.

According to the invention, the switching adhesive strips 12 are outside of those provided by the devices predefined cut and fold lines are applied to the longitudinal cuts 19 and the funnels 20 in order to facilitate the cutting and folding of the strips.

FIG. 4 shows configurations of six-page-wide printing material webs with an adhesive joint designed according to the invention. The statements made with regard to FIG. 3 apply equally to the arrangement of the switching adhesive strips 12.

FIG. 5 shows a schematic representation of a section through two printing material webs 1 and 40 to be glued together in the area of the connections. The new printing material web 1, which is wound on a roll, not shown, rotating in the direction of arrow 45, is guided against the old printing material web 40, which also runs from a roll, also not shown, after or while the web speed is being synchronized. To prepare the adhesive joint, an adhesive strip 12 made up of several layers has been used. This adhesive strip 12 has a carrier layer 31 for absorbing mechanical loads, which with one of its two outer zones, both of which are provided with adhesive layers 30, in the area of the leading edge 3 and with the other zone in an adjacent area of the next next sheet layer 8 of the new one underneath Printing material web 1 is glued on. As seen from the new printing material web 1 over the carrier layer 31, the adhesive strip 12 has a switching function layer 32, which allows the adhesive strip 12 to be detected and thus the start edge 3 of the new printing material web 1 to be detected. In the zone of the switching function layer 32 arranged above the adhesive layer 30 in the area of the web edge 3 there is another adhesive layer 33 for adhering the new printing material web 1 to the running, old printing material web 40.

In the exemplary embodiment, the switching function layer 32 is designed as an aluminum layer. According to a further embodiment of the invention, an electrically conductive strip, preferably an aluminum strip, takes on the double function of Switching function layer and carrier layer. Instead of the electrical conductivity, other detectable properties can also be used for the switching function layer, in particular also those properties that are suitable for detection by optical sensors.

The switching adhesive strip 12 is detected by a sensor, not shown, for example a proximity switch. Its output signal is used for a suitable control for a pressure roller 38, so that this pressure roller 38 is pressed against the running printing material web 40 at the moment in which the web leading edge 3 passes under the pressure roller 38. The printing substrate web 40 running through is cut in synchronism with the pressing by means of a schematically illustrated cutting device 39. In the further course, the beginning of the web edge of the new web 1 connected to the running web 40 lifts off the wound new roll, while the adhesive strip 12 still sticks to the next web layer 8 lying below the leading edge 3. In order to ensure a reliable detachment of the leading edge 3, the adhesive layer 30 could, for example, be provided with a weaker adhesive in the area that is glued to the next sheet layer 8 than the adhesive in the area of the leading edge 3. In the exemplary embodiment, however, the adhesive strip 12 is in its Provide central, adhesive-free zone with perforations 34 to form a predetermined breaking point. The two measures mentioned can also be combined with one another.

FIGS. 6 and 7 show an exemplary adhesive strip 12 in the form of a rectangle in section and on its top and bottom. In this exemplary embodiment, the carrier and conductive layer 31, 32 are formed by a laminated aluminum foil. The central zone 34 of the switching adhesive strip 12, which is provided with perforations, is arranged off-center as seen in the longitudinal direction of the strip 12. It lies in an area of the adhesive strip 12 that extends from approximately the middle can range up to about a quarter of the length of the strip 12. The zone of the switching adhesive strip 12, which is provided on both sides with adhesive layers 30 and 33, takes up the greater part of the length of the switching adhesive strip 12. The adhesive layers 30 and 33 are each formed on the top as well as on the underside up to close to the perforation 34.

FIG. 8 shows an alternative adhesive joint in which the beginning of the web 3 has been pulled off twice at an angle β at the beginning of the roll 2 using a triangular template 18 which has a length of three partial webs. The triangular template 18 has been placed on the printing material web 1 at right angles to the roll side edge 11. Thereafter, the web edge 3 is connected to the next layer 8 underneath at the points shown in FIG. 9, namely the tips of the web edge 3 formed during peeling. It is important to ensure that the edge 3 of the web coincides approximately with the front end of each switching adhesive strip 49. Finally, the adhesive joint 23 formed in this way is in turn reinforced by means of double-sided adhesive tape 10 — along the entire edge 3 of the web if necessary. The type and shape of the reinforcements in turn depend on the degree of automation of the roll preparation. A full automation of the adhesive joint preparation is possible, since after cutting the leading edge 3 by means of the guided triangle template 18, the switching adhesive strips 49 can be glued in the correct position to the roll side and leading edge 11, 3. With regard to the location of the attachment of the switching adhesive strips 49 used in this exemplary embodiment, what has been said about the rectangular switching adhesive strips 12 applies.

FIGS. 3 and 4 corresponding schematic representations of 4/4 and 6/6 wide printing material web configurations for the printing material webs prepared with the triangular template 18 are shown in FIGS. 10 and 11.

FIG. 12 shows a top view of the switching adhesive strip 49 preferred for the alternative adhesive joint 23. This switching adhesive strip 49 has the shape of a butterfly or has a simple T-shape. A laminated aluminum foil in turn forms the carrier and guide layer 51, 52, which is provided in the zone of the T trunk on the upper side, namely the side of the guide layer 52, with an adhesive layer 53 for sticking to the old, running printing material web. This switching adhesive strip 49 is provided with three adhesive zones 50 on the lower side facing the new printing material web. The middle adhesive zone 50 fills the T-trunk. Two side adhesive layers 50 are applied to the two zones of the T-beam. Adhesive-free zones 55 are formed between the T-bar zones and the T-trunk on both sides of the adhesive layer 50 of the T-trunk zone, which serve as predetermined breaking points when the T-bars are torn by incisions 54 at the attachment of the T-bar. An adhesive strip 49 with this configuration of the predetermined breaking point with break lines running parallel to the longitudinal side of the web has proven to be particularly advantageous with regard to the tear-off security. As in the case of the rectangular switching adhesive strip 12, in this T-shaped switching adhesive strip 49 the three adhesive zones 50 and the adhesive zone 53 each extend into the immediate vicinity of the break lines defined by the recesses 54 in the adhesive-free zones 55. With regard to the layer structure, the explanations for the rectangular strip 12 apply.

The choice of the shape of the adhesive joint 13 or 23 according to the exemplary embodiments corresponding to FIGS. 1 to 4, 6 and 7 and FIGS. 8 to 13 depends not least on the width of the printing material web, the web quality and also on the production speed to be maintained.

FIG. 13 shows again the gluing of the two printing material webs 40 and 1 using the T-shaped switching adhesive strip 49. The role of the new printing material web 1 has just one revolution after gluing the new printing material web 1 to the running web 40 completed.

FIG. 14 shows a fully automated adhesive joint preparation for applying an adhesive fluid. A movable device 64 for applying adhesive fluids 60 and 61 is moved up to the new printing material web 1, and the beginning of the web 2 of the new web 1 is lifted from the underlying web layer 8, for example by means of blown compressed air. A support 67 which can be moved vertically in the application device 64 is moved under the lifted web start 2. Subsequently, a first adhesive fluid 60 is sprayed onto the upper side of the web start 2 by means of a first nozzle arrangement 65 and a second adhesive fluid 61 is sprayed onto the next next layer 8 below it by means of a second nozzle arrangement 66. Instead of these two spray devices 65, 66, other suitable application devices are also conceivable. The two adhesive fluids 60 and 61 can be applied uniformly over the entire width of the printing material web 1 or also unevenly, for example distributed over a certain point, over the width of the printing material web.

The new printing material web 1 can be pivoted about a common pivot point 72 in a roll stand 70 via a common swivel arm 71 with the old, running printing material web 40. After the application of the two adhesive fluids 60 and 61, the swivel arm 71 pivots counterclockwise into the position shown in FIG. After the application of the two adhesive fluids 60 and 61, the application device 64 is moved away from the new printing material web roll and the beginning of the web 2 is glued onto the next layer 8 located underneath in the area of the second adhesive fluid 61.

FIG. 15 shows the printing substrate web 40 that is running and the new web 1 after swiveling immediately before gluing. The pressing of the running printing material web 40 against the outer circumference of the new web 1 in the area of Adhesive joint 63 prepared in this way takes place in the manner described for FIG. 5. After the area of the web layer 8 lying under the beginning of the web 2, which is provided with the second adhesive fluid 61, has left the area of the pressure roller 38, a material 69 neutralizing this adhesive fluid 61 is applied to the adhesive fluid 61 by means of an arrangement 68 in order to glue the new printing material web a second time 1 to prevent in this area.

One or both of the adhesive fluids 60 and / or 61, preferably the first adhesive fluid 60, is distinguished by its switching function. The conductive fluid 60, 61 in question is preferably admixed with electrically conductive constituents.

The first adhesive fluid 60 is preferably a more adhesive material than the second adhesive fluid 61. This makes it easier to tear off the beginning of the web 2 after it has been glued to the running printing material web 40. A powdery material 69 is preferably used as the neutralizing material.

Claims (19)

Adhesive for connecting material webs wound on driven rolls, in particular for producing an adhesive joint between a new and a running printing material web (1, 40) during the flying web change in a web-fed rotary printing machine,
characterized in that
an adhesive and a switching function are integrated in the adhesive (12; 49; 60, 61), which allows the connection of the two material webs (1, 40) to be detected directly at the connection point (23). Adhesive according to claim 1, characterized in that the integrated switching function can be detected without contact, in particular inductively or capacitively. Adhesive according to claim 1 or 2, characterized in that the adhesive is an adhesive strip (12; 49) with a switching functional layer (32) which is at least partially reflective or electrically conductive. Adhesive according to claim 3, characterized in that the adhesive is formed by an arrangement of layers with at least one carrier layer (31) for absorbing mechanical loads, the switching function layer (32), an upper adhesive layer (33; 53) lying on the switching function layer (32) ) and a lower adhesive layer (30; 50) lying on the carrier layer (31), a layer (31, 32, 30, 33) also being able to assume several or all of the above functions, so that a separate layer for such functions can be omitted . Adhesive according to claim 4, characterized in that the adhesive (12; 49) in a region of the lower adhesive layer (30; 50) with which the adhesive (12; 49) is glued to a beginning of the web (2) of the new material web (1) has a higher adhesive force than in the remaining area of the lower adhesive layer (30; 50). Adhesive according to one of claims 3 to 5, characterized in that the adhesive has approximately the shape of a rectangular adhesive tape (12) which is approximately three times as long as it is wide and has a perforation (34) as a predetermined breaking line, which is approximately a quarter arranged up to half the length of the adhesive tape (12) is. Adhesive according to claim 6, characterized in that the upper adhesive layer (33) is applied only to one side of the perforation (34) and the lower adhesive layer (30) to both sides thereof. Adhesive according to one of Claims 3 to 5, characterized in that the adhesive has approximately the shape of a butterfly or a T-shape (49) with a greatest length which is approximately twice as great as the greatest width, and that the between the T-trunk and the two T-beam lying surface sections (55) are each provided with a recess (54) as a predetermined breaking point. Adhesive according to claim 8, characterized in that only the T-trunk area of the adhesive tape (49) up to close to the respective recess (54) has an upper adhesive layer (53) and the lower adhesive layer 50 also the two T-bar areas up to close to that respective recess (54) covered. Adhesive according to Claim 1 or 2, characterized in that one or more adhesive fluids (60, 61), in particular sprayable adhesive fluids (60, 61), are used as the adhesive. Adhesive according to claim 10, characterized in that adhesive fluids (60, 61) of different adhesive strength are used. Printing material web of a rotary printing machine with a web start (2) prepared as a glue joint for the flying web change, characterized in that an adhesive (12) according to one of the preceding claims is used to prepare the glue joint (13; 23; 63). Printing material web according to claim 12, characterized in that the adhesive (12) outside the cutting and folding areas and the engagement area of circumferential drive means (22) of the printing material web (1), in particular approximately in the middle of partial webs (A to F) of the printing material web (1) is applied. Printing material web according to claim 12 or 13, characterized in that the web start (2) prepared for producing the adhesive joint (23) is predetermined by the use of a triangular template (18) which has a width of three partial webs (A to F), the a butterfly shape or a T-shape adhesive (49) is applied in each case in the region of the tips of the path start (2) predetermined by the triangular shape of the template (18). Adhesive joint between a new printing material web (1) and a running printing material web (40) of a web-fed rotary printing machine, characterized in that an adhesive (12; 49; 60, 61) for the adhesive joint (13; 23; 63), in particular according to one of Claims 1 to 11, is used, which can be detected by a suitable proximity switch. Adhesive joint according to claim 15, characterized in that the detection of the adhesive joint (13; 23; 63) by the proximity switch generates a signal for pressing the new web (1) against the running web (40) and severing the running web (40) and / or triggers a waste switch. Method for producing an adhesive joint (63) between a running printing material web (40) and a web start (2) of a replacement printing material web (1), in particular of rotary printing machines, in which a) the beginning of the web (2) of the wound-up replacement printing substrate web (1) is lifted off the replacement printing substrate web roll, b) a first adhesive (60) which can be detected by a proximity switch is applied to the beginning of the web (2) and a second adhesive (61) which is less adhesive than the next layer (8), c) the beginning of the web (2) is attached to the replacement printing material web (1) by the second adhesive (61), d) the beginning of the web (2) is fastened with the first adhesive (60) to the running web (40) and the running web (40) is severed, and in which e) the exposed second adhesive (61) is rendered ineffective. A method according to claim 17, characterized in that an electrically conductive adhesive is used as the first adhesive (60). A method according to claim 17 or 18, characterized in that the first and the second adhesive (60, 61) are sprayed uniformly or selectively over the entire web width.

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