EP3405421B2 - Device and method for changing a reel and for connecting a new material web to the end of an old material web - Google Patents

Description

The invention relates to a device and a method for unwinding a material web.

Webs of material that are required for a further processing in a further processing machine are often made available in the form of a roll. This web of material is then unwound from the roll in an unwinding device. If the supply of material web on this roll is coming to an end, a new roll must be introduced into the unwinding device. So that the beginning of the web of this new roll does not have to be fed into the further processing machine separately, this beginning of the web is attached to the trailing end of the web of the first roll. The further processing machine should also be able to be operated as efficiently as possible during the lap change. In addition, it may also be necessary for the attachment point not to cause any disruptions in the further processing machine. document U.S. 2014/251528 discloses a device and a method for changing a roll according to the preamble of claims 1 and 8.

It is therefore the object of the present invention to provide a device and a method with which a downstream processing machine can be operated as efficiently and trouble-free as possible.

The object is solved by the features of claim 1.

The material web wound up on the first roll is accordingly located in the unwinding device, in particular at a first unwinding position. The roll can preferably be driven in rotation by a drive in order to simplify unwinding. The web of material can then be transported via a transport roller, with the web of material generally not covering the entire transport surface but only part of it, ie a cylinder segment. This area is called the lead area. The material web is transported at a transport speed. The transport device can be at a distance from the roll or be in direct contact with the outermost layer of the roll.

To change the roll, the unwinding device now has to be fed a second roll, with which the new material web can be made available. This roll can then be in a second unwinding position. Alternatively, the first roll can be brought into a second unwinding position and the second roll can be brought into the first winding position in the unwinding device. In the unwinding position, the coil can be moved within the unwinding device. A drive is also included, with which the winding can be driven in rotation. In particular, the winding can be accelerated and also braked by the drive, it being possible for a separate brake to be provided as an alternative or in addition to the braking.

To carry out the actual change of the material web, a separating device is provided, with which a trailing end of the first material web can be produced. This separating device acts on the material web in the guide area. It is preferred if the separating device is immovable relative to the web of material at least at the moment of the separating process, i. i.e. it moves itself at the transport speed of the material web.

Furthermore, a control and/or regulating device is provided for the mutual adjustment or positioning of the trailing end and a web start of the new material web. Advantageously, the new roll and/or the new web of material can be adjusted by the control and/or regulating device to a transport speed that the old web of material assumes at the moment of connecting the trailing end of the first web of material. However, the setting can be done before the actual connection. What is decisive, however, is that after the setting, the transport speeds of the first and the second material web are only changed synchronously, preferably no longer. The mutual adjustment includes not only the synchronization of the speed, but also the placing of the beginning of the web on a base on which the end of the first material web also rests. This is the guide area of the transport roller. The setting is made in such a way that the distance between the trailing end and the start of the web is greater than 0 mm. In particular, this means that the two webs of material do not overlap. Overlapping would mean an excessive, namely usually twice the material thickness, with the material that is required for the durable connection of both material webs, such as glue or an adhesive tape, also contributing to the thickening. Such a thick point is capable of disrupting the operation of a processing machine. However, due to the lack of overlap, the unwinding device according to the invention provides a connection point that can be processed more easily in a processing machine and avoids faults there.

During or immediately after the setting of the trailing end and the beginning of the web, both webs of material are connected to one another with a connecting element, it being possible for example for an adhesive tape to be used as the connecting element. The guide area of the transport device can provide the necessary counter-force during the connection process and thus serves as a counter-support.

According to the invention, the adjustment and/or the joining take place at a transport speed of more than 0 meters per minute (m/min), preferably more than 50 m/min, in particular more than 100 m/min. In particular, this means that the lap change does not take place at a standstill. The processing machine can thus be continuously supplied with the web of material, so that it can continue to produce with little or no restrictions.

In a preferred embodiment of the invention, it is provided in particular that the transport path of the material web is not changed downstream of the transport device during the connection. In other words, the device is designed without a buffer store. Such an intermediate store, which is often designed as a dancer device, could allow the material webs to be connected when they are stationary without the further processing machine having to be slowed down or stopped, but such an intermediate store is space-consuming, expensive and susceptible to maintenance. In addition, such an intermediate store leads to different web tensions, which can be very disadvantageous for numerous applications, since this can change the properties of the material webs, particularly if the material web is or comprises a plastic film.

In an advantageous embodiment, a transport device is provided in which the separating device is integrated. The separating device can be designed as a separating knife. In the rest position, the separating device can be integrated within the transport device, in particular within the roller body of a transport roller, and in its functional position protrude from the outer surface of the transport device and thus cause the separation of a material web. This is in particular a space-saving arrangement of the separating device. Such a transport device can also include devices for fixing the first and/or the second web of material on the guide area. These can be holes in the guide area of the transport device that can be subjected to negative pressure, such as suction holes. However, electrodes can also be provided, which can provide for an electrostatic charging of the material web. An electrostatic force of attraction between the web of material and the guide area can thus be brought about, which is particularly effective in the case of plastic webs. In a further alternative, blowing nozzles can be provided with which a gas flow can be directed onto the material web in order to be able to apply a force in the direction of the guide area.

Furthermore, a braking device can act on the first roll in order to be able to hold back the end of the first web of material following separation so that it does not get into the area in which the connection of the first web of material to the second web of material takes place. For this purpose, the optional drive can be operated as a generator (electric brake) and/or a mechanical brake can be provided, which preferably acts on the winding axis receiving the roll.

In a further embodiment, the separating cut is preferably a cut running at right angles to the direction of transport of the material web, so that the trailing end and the beginning of the web, especially if this is also an edge running at right angles to the direction of transport, have a constant distance, which has a positive effect on the tensile forces during further transport of the material webs. Different tensile forces and/or web tensions in the transverse direction are thus minimized or even completely prevented.

Overall, the first web of material can be severed and the resulting trailing end can be held in the guide area.

If the new web start of the second material web is now placed on the guide area at a distance of more than 0 mm, this web start must be fixed in the guide area, because the contact pressure of a clamping device is only available for a brief moment. In one embodiment, a double-sided adhesive tape can be provided whose adhesive sides have different adhesive forces have. The side that has the lower adhesive force can be used to initially hold the beginning of the web on the roll, especially when the roll is rotating. The side having the higher adhesive force may be attached to the leading end such that a first surface part of this side sticks to the leading end of the web and a second surface part is free and brought into contact with the trailing end when it is adjusted to the trailing end. As the material webs, which are now connected, continue to be transported, the start of the second material web detaches from the roll, since the corresponding adhesive force is lower than the adhesive force of the side that now connects both material webs to one another. Additionally or alternatively, the transport device can be designed in such a way that after the mutual adjustment of the trailing end and the beginning of the web, the latter is held on the transport device by holding forces. In this case, too, holes in the jacket of the transport device that can be subjected to negative pressure are conceivable, which are used for suction fixing at least the beginning of the web. Blowing nozzles from which a pressurized gas flows out, with the gas flow being directed towards the start of the web, are also conceivable. Again, electrodes for electrostatically charging the web to produce an electrostatic attraction are also conceivable here. Mechanical aids such as holding tongs can also be provided for the above-mentioned purpose.

In the event that an adhesive strip has not already been applied to the start of the web in preparation for changing the lap, a connecting element application device can be provided within the unwinding device, in particular an adhesive strip application device. A connecting element can then be applied when the trailing end and the beginning of the web have already been mutually adjusted and are still in the guide area.

In a further embodiment of the invention, a further transport device can be provided for the new web of material, with which the new web of material can be guided before it is adjusted to the trailing end. In this embodiment, a further separating device is also provided for producing a beginning of the web. This additional transport device also includes a guide area. After the beginning of the web has been produced, the further transport device can be placed against the first transport device, with the start of the web being able to be transferred to the first transport device. This transfer process can be supported by at least one device for pushing off the beginning of the web from the further transport device. These can be, for example, openings on the outer surface of the transport device, which can be subjected to excess pressure, so that the beginning of the web detaches from the said guide area of the second transport device.

The object mentioned at the beginning is also achieved by the features of claim 7.

Fig. 1

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung während der Abwickelphase

Fig. 2

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung mit einem in die Wechselposition verlagerten ersten Wickel

Fig. 3

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung mit einem in die Wechselposition verlagerten ersten Wickel

Fig. 4

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung mit einem zum Wickelwechsel vorbereiteten zweiten Wickel

Fig. 5

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung mit beschleunigtem zweiten Wickel

Fig. 6

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung, wobei das Bahnende des ersten Wickels und der Bahnanfang des zweiten Wickels die Kontaktstelle erreichen.

Fig. 7

Prinzipskizze einer erfindungsgemäßen Abwickelvorrichtung, wobei der erste Wickel abtransportiert wird.

Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination of features mentioned. Within the scope of the disclosure as a whole, features and details that are described in connection with the method according to the invention apply, of course, also in connection with the unwinding device according to the invention and vice versa, so that the disclosure of the individual aspects of the invention is or are always referred to mutually can. The individual figures show:

1

Schematic sketch of an unwinding device according to the invention during the unwinding phase

2

Schematic sketch of an unwinding device according to the invention with a first roll shifted into the changing position

3

Schematic sketch of an unwinding device according to the invention with a first roll shifted into the changing position

4

Schematic sketch of an unwinding device according to the invention with a second roll prepared for changing the roll

figure 5

Schematic sketch of an unwinding device according to the invention with an accelerated second winding

6

Schematic sketch of an unwinding device according to the invention, the end of the web of the first roll and the start of the web of the second roll reaching the contact point.

7

Schematic sketch of an unwinding device according to the invention, with the first roll being transported away.

The 1 shows a schematic diagram of an unwinding device 100 according to the invention during the unwinding phase, in which a roll 101 is initially located in the unwinding device 100. The web of material 102 is pulled off the roll 101 and runs over a contact roller 103 to which the roll 101 is preferably employed. For this purpose, the roll 101 can be rotatably mounted on carriages (not shown), the carriages then being displaceable on rails relative to the contact roller 103 . The rails are connected to swivel arms 104 which can be swiveled about the axis of rotation 105 of the contact roller 103 so that the roll 101 can assume different angular positions of the contact roller 103 . During the normal unwinding process shown, the roll 101 rotates in the direction of the arrow 111 and the contact roller 103 rotates in the direction of the arrow 113, ie they rotate in opposite directions. The direction of transport of the material web 102 is indicated by the arrow 112 .

The 2 now shows the situation in which the roll 101 was unwound down to a small roll size, in which there is only so much material web on the roll that at the end of the changing process there is only a small safety reserve. In the situation shown, the pivoting arms 104 have been pivoted in the direction of the arrow 201 counter to the direction of rotation of the contact roller 103, so that the roll 101 can be transferred to the bearing arms 202. In this position, which can be referred to as the second winding position, the roll continues to be unwound.

In the 3 it is now shown that the coil remains in the second unwinding position. The swivel arms 104 are now swiveled back. The position that the swivel arms assume after swiveling back can be the unwinding position as per FIG figure 1 or, as shown, a receiving position for receiving a new roll 121. This position is opposite the unwinding position according to FIG 1 preferably lowered so that the coil does not have to be lifted using a crane or forklift.

The 4 now shows the situation according to the 3 , but with swivel arms 104 swiveled back into the unwinding position 4 another advantageous detail is shown. The new roll 121 is prepared for a roll change in such a way that a double-sided adhesive tape 122 is glued in the transverse direction with its underside 124 in the transition area from the first material web layer to the second material web layer of the roll 121 . The back of the beginning of the web 125 is glued to a partial surface of the upper side 123 of the adhesive tape 122 . The part of the upper side 123 of the adhesive tape 122 that is not occupied by the start of the web 125 initially remains free.

In the figure 5 it is now shown that the second roll has been set in rotation. This is indicated by the arrow 131. During the acceleration phase, the second roll 121 was synchronized with the contact roller 103 in terms of circumferential speed and angular position, with the beginning of the web 125 hitting the contact roller 103 at or just behind the position 141 of the cutting knife 142 of the contact roller 103. By "just behind" is preferably meant a range from greater than 0 millimeters (mm) to 30 mm, in particular up to 20 mm and preferably up to 10 mm. Like in the figure 5 can further be seen, the separating blade, after it has passed the roll 101, moved out of the peripheral surface of the contact roller in order to sever the material web 102. Immediately after the severing cut has been made, the severing blade 142 is withdrawn again in order not to damage the roll 121 . Before the end of the material web 102 produced by the separating cut passes the contact point between contact roller 103 and roll 121, the roll 121 has already been moved up to the contact roller 103 by the carriage-rail system described above in order to come into contact with it.

The 6 It can be seen that the web beginning of the new roll 121 reaches the contact line almost simultaneously with the web end of the material web 102, with the free surface of the adhesive tape 122 now being placed on the web end, so that the web end of the material web 102 is in contact with the web beginning of the new winding is connected. The double-sided adhesive tape 122 includes an upper side 123, which has a higher adhesion than the adhesion of the underside 124 of the adhesive tape in relation to the material of the material webs. It can thus be ensured that when the two webs of material have been connected, the adhesive tape also detaches from the transition between the first and second material layer of the roll 121 . In order to make the process described even safer, devices can be provided which apply an additional force to the end of the web and/or the beginning of the web in the direction of the surface of the contact roller. For this purpose, openings that can be subjected to negative pressure, such as suction bores, can preferably be provided in the surface of the contact roller. Such openings are in the 6 Not shown.

Before the web end 143 of the first roll 101 produced by the cutting blade 142, the contact line between the second roll 121 and the contact roller 103 could reach, the first roll 101 is braked by a braking device, not shown, so that the web end 143 does not reach the area of the contact line.

In the 7 Finally, it is shown that the connection point, which can be seen on the adhesive tape 122, is transported further by the rotation of the contact roller 103, which is still taking place, while the first roll 101 is removed from the contact roller along the bearing arms 202 and brought to a removal position . From there, the first coil 101 can be removed from the coiling device 100 . This is the state according to the figure 1 been restored, the second roll 121 is now the first roll 101 for the subsequent changing process.

Various elements of the device according to the invention have been shown several times in the individual figures. For the sake of clarity, the same elements have only been provided with reference symbols in one or a few figures. Nevertheless, the reference symbols also apply with regard to figures in which they are not entered. Reference List 100 unwinding device 101 wrap 102 web of material 103 contact roller 104 swivel arms 105 axis of rotation 111 Arrow 112 Arrow 113 Arrow 121 New wrap 122 Double sided tape 123 Top of tape 122 124 Underside of tape 122 125 beginning of track 131 Arrow 141 Position of the cutting knife 142 142 separating knife 143 tail end 201 Arrow 202 bearing arms

Claims (7)

1. A device for changing a reel and for connecting a new material web to the end of an old material web with

   • a first reel, the wound-up, first material web of which can be unwound,

   • a transport roller, by means of which the first material web can be guided in a guiding region, wherein the material web occupies a cylinder segment of the transport roller, at a transport speed,

   • a second reel, with which the new material web can be prepared,

   • a drive device for rotatably driving the second reel,

   • a separating device for cutting through the first material web, with which the material web can be cut through in the guiding region in order to produce a trailing end,

   • a control and/or regulating device for the mutual adjustment of the trailing end and a web start of the second material web, such that the trailing end and the web start are at a distance of more than 0 mm from each other and in particular do not overlap,

   • wherein the trailing end and the web start of the new material web can be connected to each other in the guiding region with a connection element, and

   • wherein the transport speed of the trailing end and the web start in the guiding region is more than 0 meters per minute.
2. The device according to Claim 1,
   characterized in that
   the trailing end and the web start are at a distance of less than 30 mm, in particular less than 20 mm and preferably less than 10 mm from each other.
3. The device according to any one of the preceding claims,
   characterized in that
   the adjustment and/or the connection takes place at a transport speed of more than 0 meters per minute (m/min), preferably more than 50 m/min, in particular more than 100 m/min.
4. The device according to any one of the preceding claims,
   characterized in that
   it is designed so as to be free of intermediate storage.
5. The device according to any one of the preceding claims,
   characterized in that
   the separating device is arranged within the transport roller and can be led out for the separation from the surface, on which the material web rests, wherein a separating cut is performed.
6. The device according to any one of the preceding claims,
   characterized in that
   a braking device is provided, with which the first reel can be braked.
7. A method for changing a reel and for connecting a new material web to an end of an old material web, wherein

   • a wound-up, first material web is unwound from a first reel,

   • the first material web is guided by means of a transport roller in a guiding region, wherein the material web occupies a cylinder segment of the transport roller, at a transport speed,

   • the new material web is prepared by a second reel,

   • the second reel is rotatably driven by a drive device,

   • the first material web is cut through with a separating device for the cutting through in the guiding region in order to produce a trailing end,

   • the trailing end and a web start of the second material web are adjusted by means of a control and/or regulating device, such that the trailing end and the web start are at a distance of more than 0 mm from each other and in particular do not overlap,

   • the trailing end and the web start of the new material web are connected to each other in the guiding region with a connection element, and

   • the transport speed of the trailing end and the web start in the guiding region is more than 0 meters per minute.

Images