EP2679527B1 - Corrugated board system and method for producing corrugated board - Google Patents

Description

Corrugated board plants or processes for the production of corrugated board are well known by public prior use. Corrugated webs of material webs are formed in the corrugated board production devices of the corrugated board plants. A disadvantage of the known corrugated board systems and methods for producing corrugated board is that the web tension at the inlet or entrance of the corrugated board production device is generally not optimal, which often leads to problems in corrugated board production. Furthermore, the known corrugated plants have an extremely high energy and electricity requirements. The brake devices used to increase the web tension are also often exposed to high wear.

From the EP 1 190 843 A2 a corrugated board plant with a web tension fluctuation equalizer is known. The corrugator has stock rolls for unwinding a deck sheet and a stock roll for unrolling a base sheet. The supply roller for unrolling the cover sheet is associated with a web tension coarse adjustment means which adjusts the web tension in dependence on the tension detected by a web tension detecting means. Also, the supply roller for unrolling the base web is associated with a web tension coarse adjustment means. The deck train and the ground track are fed to a single facer. Upstream of the single facer, the deck web is associated with the web tension sensing means. Between the web tension detecting means of the deck sheet and the single facer is a web tension fluctuation equalizer having a Web tension fluctuation detecting means and a web tension adjusting means disposed on the deck sheet.

From the EP 1 270 472 A2 a device for controlling the web tension of a moving material web is known. This comprises a main roller around which a deck track is guided. The wrap angle of the cover sheet about the main roll is changeable to adjust the web tension. Subsequently, the cover sheet is fed to a corrugated board manufacturing unit, which is also fed to a corrugated web. The cover sheet is associated with a web tension sensor which emits a corresponding measurement signal via a line to a central control unit. If the web tension is too low, the control unit outputs appropriate signals to motors. To increase the web tension, the speed of the main roll can be reduced, around which the cover web is guided. If this is not enough, tensioning rollers are pivoted over the motor, which increases the wrap angle of the cover sheet around the main roller.

The JP 01-316257 A discloses a plant for the production of corrugated board. A constant web tension is obtained by changing the brake pressure as a function of a paper diameter.

A disadvantage of these known systems or devices is that the web tension at the inlet or entrance of the corrugated cardboard production device is generally not optimal. This can, as already mentioned, lead to problems in corrugated cardboard production.

The invention is therefore based on the object to provide a corrugated plant, which has a comparison with conventional corrugated plants improved web tension, in particular at the entrance of the corrugated board production device. Furthermore, the corrugated board plant should have a particularly low energy and power consumption and extremely low wear of the web tension control devices for the change in web tension. A corresponding method for producing corrugated cardboard should also be provided.

This object is achieved by the features specified in the independent claims 1 and 16 features. The core of the invention is that a first and at least one second web tension control device are provided for the first material web, wherein a change, ie increase or decrease, the web tension the first material web initially via the first web tension control device and then optionally via the at least second web tension control device, which is located further away than the first web tension control device of the corrugated cardboard production device. If necessary, therefore, the web tension control devices are actuated by the corrugated board production device in the direction of the first material supply device. The web tension of the first material web is thus regulated upstream relative to the transport direction of the corrugated cardboard production device. The at least second web tension control device is arranged upstream of the first web tension control device. Wrinkling can be prevented very effectively. Furthermore, the web tension control devices are then subject to a particularly low wear.

It is advantageous if, during operation, the first material web in the entire corrugated board system essentially always has a certain basic line tension. The first material web is then applied to the web tension control devices and is thus particularly well and effectively changeable in their web tension. In particular, then the first material web is on the rollers of the web tension control devices on the outside in the circumferential direction.

As used herein, the term "at least second web tension control device" or the like is understood to mean that two or more, such as two, three, four, five, etc. web tension control devices may be provided on the first web of material , If present, the third web tension control device is located upstream of the second web tension control device. If present, the fourth web tension control device is located upstream of the third web tension control device. If present, the fifth web tension control device is located upstream of the fourth web tension control device. The same applies to any further web tension control devices.

It is advantageous if the web tension of the second material web remains unaffected by the at least one web tension control device.

The web tension of the first material web is thus gradually changed. It is advantageous if each web tension control device results in a web tension change stage.

The first material web may be a corrugated web or a deck web.

Under web tension control devices are here preferably understood devices that can act directly on the material webs, preferably mechanically, to change their web tension. This can be done for example by the targeted operation of rollers around which the material webs are guided, and / or by changing the angle of wrap of the material webs around the rollers.

The web tension information can be, for example, information or values that represent direct web tension or from which web tension can be calculated.

The web tension control signals are preferably electrical signals suitable for operating the web tension control devices.

By the term "communicating in a data-transmitting manner" is meant a connection capable of transmitting data or signals. Such a connection can be formed, for example, by electric lines, optical lines, cables, radio, infrared, Bluetooth or the like.

Preferably, in use, the first web tension control device increases the web tension of the first web of material to the first web tension limit, and then, if desired, the at least second web tension control device increases the web tension of the first web over the first web tension. Limit increased.

Preferably, in use, the first web tension control device reduces the web tension of the first web of material to the first web tension limit, and then, if desired, the at least second web tension control device increases the web tension of the first web over the first web tension. Limit further reduced.

Further advantageous embodiments of the invention are specified in the subclaims.

The embodiment according to claim 2 allows a further adaptation of the web tension of the first material web. In particular, such an adaptation of the web tension is virtually the entire course of the first Material web possible. The at least one web tension control apparatus is preferably designed essentially corresponding to the first or second web tension control device.

Due to the configuration of claim 3, an increase or reduction of the web tension of the first material web is possible in a particularly simple and effective manner. In use, the braking means applies a braking torque to the first material web while the accelerating means in use exerts a corresponding acceleration moment on the first material web.

It is advantageous according to claim 4, when the braking means and / or the acceleration means is / are formed by a roller in contact with the first material web. The roller is preferably annular or circular in cross section. When the roller is decelerated, the roller acts as a brake means. The roller, on the other hand, provides an accelerator when accelerated.

The embodiment according to claim 5 is characterized by its simplicity. It is advantageous if the drive is an electric drive.

With the corrugated cardboard production apparatus according to claim 6, for example, one-sided laminated or multi-sided laminated corrugated web can be produced. For this purpose, smooth material webs or cover webs are conveniently connected in area with corrugated corrugated webs in the corrugated board production device. The at least one corrugated or corrugated web is corrugated by the at least one corrugation device. The connection device preferably forms a conventional laminating device.

The embodiment according to claim 7 leads to an extremely compact and simple construction. Alternatively, it is possible for the web tension measuring device and the first web tension control device to be formed or arranged separately from one another.

The embodiment according to claim 8 allows the production of endless material webs by first or at least second material webs are each connected to one another end. An ending first material baln is thus connected to a new first material web. Alternatively, the first and / or the at least second material supply device is designed as a conventional unwinding device, which in each case supports a roll of a respective material web.

The embodiment according to claim 9 leads to an extremely advantageous regulation of the web tension of the first material web.

The embodiment according to claim 10 results in a particularly advantageous control of the web tension of the first material web. The web tension of the first material web is preferably 1.5 to 6 times, more preferably 2 to 5 times, most preferably 3 to 4 times, greater than the first material supply device on the corrugated board production device.

It is advantageous if the first material web in the first material supply device already has a web tension which is greater than zero. Advantageously, the first material web thus already has a certain basic line tension in the case of the first material supply device. Also in the corrugated board production apparatus, the first material web preferably has a web tension greater than zero. The first Material web advantageously also has a web tension greater than zero between the first stock supply device and the corrugated board production device. The web tension of the first material web is preferably added from the first material supply device toward the corrugated board production device. Conveniently, the web tension of the first material web is added from 1.5: 1 to 6: 1, more preferably from 2: 1 to 5: 1, most preferably from 3: 1 to 4: 1. For example, a web tension value of 50 N / m to 400 N / m can be specified on the first material supply device. At the corrugated board production device, the first material web then has a correspondingly greater web tension.

Claims 11 to 15 relate to preferred embodiments of the at least third web tension control device.

Preferably, in use, the first web tension control device increases the web tension of the first web of material to the first web tension limit and the second web tension control device in use increases the web tension of the first web of material to a second web tension limit, wherein, if necessary, the at least third web tension control device increases the web tension of the first web of material beyond the second web tension limit.

Preferably, in use, the first web tension control device reduces the web tension of the first web of material to the first web tension limit and the second web tension control device in use reduces the web tension of the first web of material to the second web tension limit; then if necessary, the at least third web tension control device further reduces the web tension of the first material web beyond the second web tension limit value.

The embodiments according to claims 17 and 18 allow a particularly advantageous control of the web tension of the first material web.

Preferably, the first web tension control device increases the web tension of the first material web substantially to its maximum control power, and only then does the at least second web tension control device come to further increase the web tension of the first material web as needed Commitment.

Preferably, the first web tension control device substantially reduces the beam tension of the first material web to its maximum control power, and only then does the at least second web tension control device come to further reduce the web tension of the first web Commitment.

The embodiments according to claims 25 to 33 relate to preferred embodiments of the at least third web tension control device.

Preferably, the first and second web tension control devices substantially increase the web tension of the first material web to their respective maximum control power, and only then does the at least third web tension control device come on demand for further increasing the web tension of the first web of material.

Preferably, the first and second web tension control devices substantially reduce the web tension of the first material web to their respective maximum control power, and only then does the at least third web tension control device come to further reduce the web tension of the first material -Bahn used.

It is advantageous if the first web tension control device has or sets a first web tension limit value. It is advantageous if the second web tension control device has or sets a second web tension limit value. The same applies preferably to any further web tension control devices.

A combination of the objects according to the independent claims 1 and 16 with each other as well as the subject matter of the related dependent claims is possible. A combination of an independent claim with a dependent claim or with dependent claims of the other independent claim is possible.

Fig. 1

eine schematische Ansicht einer erfindungsgemäßen Wellpappe-Anlage gemäß einer ersten Ausführungsform, und

Fig. 2

eine schematische Ansicht einer erfindungsgemäßen Wellpappe-Anlage gemäß einer zweiten Ausführungsform.

Hereinafter, two preferred embodiments of the invention will be described by way of example with reference to the accompanying drawings. Showing:

Fig. 1

a schematic view of a corrugated board according to the invention according to a first embodiment, and

Fig. 2

a schematic view of a corrugated board according to the invention according to a second embodiment.

Corresponding parts or components are in the FIGS. 1 and 2 provided with the same reference numerals. Also details of the embodiments explained in more detail below may constitute an invention in itself or be part of an inventive subject matter.

A corrugated board installation for producing a single-faced corrugated board web 1 has a first splicing device 2, a second splicing device 3 and a corrugated board production device 4. The first splicing device 2 comprises a first unrolling unit 7 for unrolling a finite first material web 5 from a first material reel 6 and a further first unrolling a further finite first material web from another first material reel 8 Roll-off unit 9. The finite first material webs 5 are connected to provide a first endless material web 10 by means of a connecting unit, not shown, of the first splicing device 2. Each time a first finite material web 5 is joined, a joining seam is formed in the first endless material web 10, which extends transversely to the endless material web 10 and, if appropriate, is cut out of it again by means of a cross-cutting device.

The second splicing device 3 is constructed according to the first splicing device 2 and comprises for rolling a finite second material web 11 from a second material roll 12 a second unrolling unit 13 and for unrolling a further second finite material web of another second roll of material 14, a further second unrolling unit 15. The finite second material webs 11 are the Providing a second endless material web 16 by means of a non-illustrated connecting unit of the second splicing device 3 connected to each other. Each time a second second material web 11 is joined, a connecting seam is formed in the second endless material web 16, which runs transversely to the second endless material web 16 and, if necessary for reasons of quality, is severed therefrom by means of a cross-cutting device.

The two endless material webs 10, 16 are fed to the corrugated board production device 4. The corrugated cardboard production device 4 for producing a single-faced laminated corrugated web 1 is well known, for example from the EP 0 687 552 A2 (equivalent to U.S. Patent 5,632,850 ), of the DE 195 36 007 A1 (equivalent to GB 2 305 675 A ) or the DE 43 05 158 A1 to which reference is made for details. In the corrugating machine 4 there is a corrugator (not shown), which conveniently comprises a first corrugating roller rotatably mounted about a first rotational axis and a second corrugating roller rotatably mounted about a second rotational axis. The rotation axes are parallel to each other. The corrugated rolls form a corrugated gap. Through the corrugated gap, the first or second endless material web 10, 16 can be passed, whereby it is corrugated. An endless corrugated web is then available after the corrugated rolls. It is assumed here that in this embodiment of the invention, the first endless material web 10 is corrugated.

To join the corrugated first endless web of material 10 with the untrimmed second continuous web of material 16 to the single faced corrugated web 1, the corrugated board producing apparatus 4 further advantageously comprises a connecting device (not shown). The connection device preferably has a gluing unit and a laminating unit. It comprises a size coat roller, a size metering roller, a glue container and two pressure rollers. For passing and gluing the corrugated first endless web of material 10, the sizing roll forms a nip with the second corrugating roll, the sizing roll for applying glue being partially disposed within the glue container. The size metering roller abuts against the size coat roller and serves to form a uniform size coat on the size coat roller. For pressing the sized first corrugated endless web 10, the one press roll with the second corrugating roll forms a roll nip through which the first corrugated endless web 10 and the second non-corrugated endless web -Bahn 16 are performed simultaneously. Differently designed connection devices may alternatively be used.

For temporarily storing and buffering the corrugated web 1 laminated on one side, it is fed to a storage device 17, the corrugated web 1 laminated on one side having a transport direction 18 in the storage device 17. The corrugated web 1 forms 17 loops 19 in the memory device. The memory device 17 is formed like a table and is also known as a bridge.

To produce a double-sided laminated corrugated web, a third splice device is provided, wherein the third web is glued to the one-sided laminated corrugated web 1 in a known manner.

To regulate the web tension of the first endless material web 10, a web tension measuring control arrangement is provided which between the first splicing device 2 and the corrugated cardboard production device 4 is arranged. The web tension measuring control arrangement comprises a web tension measuring control device 20, which in turn comprises a web tension measuring device 21 for measuring the web tension of the first endless material web 10 and a first web tension control device 22 for Rules of the web tension of the first endless material web 10 has. Furthermore, the web tension measurement control arrangement has a second web tension control device 23 for further controlling the web tension of the first endless material web 10. The web tension measurement control device 20 is located between the second web tension control device 23 and the corrugated cardboard production device 4 is arranged. Further, the web tension measuring device 21 is disposed between the first web tension control device 22 and the corrugated cardboard production device 4. The second web tension control device 23 is arranged upstream of the first web tension control device 22.

The web tension measuring device 21 measures the web tension of the first endless material web 10 and dispenses a corresponding electrical measuring signal via a line 24 to a central electronic information processing unit 25. It can for example be designed as a measuring roller whose axis is transversely displaceable. This axis movement can then be detected.

The first and second web tension control devices 22 and 23 each include a main roller 26 and 27, respectively. The main rollers 26, 27 are rotatably drivable. For this purpose, the main rollers 26, 27 associated with electric drives 29 and 30, respectively. The information processing unit 25 communicates via lines 31 and 32 with the drives 29 and 30 in a data-transmitting manner in connection or in signal connection.

Further, the first web tension control device 22 has a slave roller 33 which forms a roller gap for the first endless material web 10 with the main roller 26. The sub-roller 33 is pivotable in its entirety about the axis of the main roller 26. For this purpose, the sub-roller 33 is mounted correspondingly via a corresponding bearing arm 34.

On the other hand, the second web tension control device 23 comprises two sub-rollers 35 which are coupled to one another and form a roller gap with the main roller 27. The secondary rollers 35 are pivotable about the axis of the main roller 27 as a whole. For this they are stored in a storage rack 36 accordingly.

The web tension measurement control arrangement further comprises a third web tension control device 53 for further controlling the web tension of the first endless material web 10. The third web tension control device 53 is upstream of the second web tension control device 23 arranged on the first material web 5, 10. It is thus located between the second web tension control device 23 and the first splicing device 2.

The third web tension control device 53 comprises a main roller 54 which is rotationally brakable. For this, the main roller 54 is associated with an electric drive 55 for actuation. The first Endless material web 10 is partially circumferentially on the main roller 54 at.

The information processing unit 25 communicates via a line 56 with the drive 55 in a data-transmitting manner in signal connection. The drive 55 receives corresponding web tension information to the first material web 5, 10 from the information processing unit 25.

The information processing unit 25 further communicates with the first material roll 6 and the other first material roll 8 in a data transfer manner so as to control the web tension of the first material web 5 there as well. For this, the information processing unit 25 is connected to another electronic information processing unit 37 in a data transmitting manner. The further information processing unit 37 is connected via lines 38 and 39 to the first material roll 6 and the other first material roll 8 in a data-transmitting manner. More specifically, the leads 38 and 39 are each connected to a web tension control apparatus (not shown) in a data transmitting manner associated with the first material roll 6 and the other first material roll 8, respectively. The information processing units 25 and 37 may be combined into a common unit.

Between the second splice device 3 and the corrugated cardboard production device 4, a first or a second web tension controller 40, 41 for regulating the web tension of the second endless material web 16 are arranged. The first and second web tension controllers 40, 41 again have a main roller 42, 43 which are driven by a drive 44 and 43, respectively. 45 can be accelerated and / or braked. The main rollers 42, 43 are associated with secondary rollers 46 and 47, respectively, which are pivotable about the axis of the respective main roller 42 and 43 in total and with these in each case a roller gap for the second endless material web 16 form. The drives 44 and 45 are preferably not in communication with the information processing units 25 and 37 in a data-transmitting manner. Such a connection is alternatively possible.

The function or operation of the corrugated board system is described below. The first material web 5 is unrolled from the first material roll 6. The first material web 5 or the first endless material web 10 is then guided via deflecting rollers 48 to the third web tension regulating device 53, where it runs in regions around the main roller 54. From the third web tension control device 53, the first material web 5 or the first endless material web 10 is then guided to the second web tension control device 23, where it passes through the roll gap between the secondary rolls 35 and the main roller 27 is running. The first material web 5 or the first endless material web 10 then runs after the second web tension control device 23 into the first web tension control device 22, where it passes through the roll gap between the sub-roll 33 and the main roller 26 is running. The first material web 5 or the first endless material web 10 then runs into the corrugated cardboard production device 4 via its entrance.

The third web tension control device 53 is therefore arranged downstream of the first splice device 2, wherein the third web tension control device 53 in turn upstream of the first Web tension control device 22 and upstream of the second web tension control device 23 is arranged.

The second web tension control device 23 is therefore arranged downstream of the first splice device 2, the first web tension control device 22 in turn being arranged downstream of the second web tension control device 23. The corrugated board production device 4 is in turn arranged downstream of the first web tension control device 22.

The second material web 11 is unrolled from the second material roll 12. The second material web 11 or the second endless material web 16 is guided via deflecting rollers 49 to the first web tension controller 40, where they pass through the roller formed between the secondary rollers 46 and the main roller 42. Gap is running. The second material web 11 and the second endless material web 16 is then guided into the second web tension regulator 41, in which it passes through the roll nip formed by the sub-roll 47 and the main roll 43. The second material web 11 and the second endless material web 16 then passes into the corrugated cardboard production device 4 via the entrance.

The first material web 5 or the first endless material web 10 is conveyed in a transport direction 50 from the first splicing device 2, while the second material web 11 and the second endless material web 16, respectively is transported from the second splicing device 3 in a transport direction 51.

As already mentioned, the corrugated web is formed by the first material web 5 and the first endless material web 10 by the between the Corrugated rolls present rippling gap is guided. The corrugated web is then passed through the roll nip formed between the second corrugating roll and the size coat roll. The sized corrugated web and the second web of material 11 and second endless web of material 16 are then passed through the nip between rollers which is present between the two nip rolls. The second material web 11 or second endless material web 16 serving as the cover web is thus glued to the corrugated web 5, 10.

The resulting single-faced laminated corrugated web 1 is then fed from the output of the corrugating machine 4 to the storage device 17 for temporary storage and buffering, where the corrugated web 1 is transported along the transport direction 18.

The information processing unit 25 controls the corrugating machine. In this case, the information processing unit 25 receives via the line 24 electrical web tension information or measurement signals from the web tension measuring device 21. In the information processing unit 25, the measured web tension information is processed. The information processing unit 25 is provided with the information such that the information processing unit 25 knows when the web tension of the first material web 5 or of the first endless material web 10 at the web tension measurement Device 21 changes, ie increases or decreases. Depending on the web tension determined by the web tension measuring device 21, the first drive 29 of the first web tension control device 22 is actuated.

If the web tension value of the first material web 5 or of the first endless web of material 10 measured by the web tension measuring device 21 is different than a web tension desired value, then the drive 29 is connected via the line 31 through the information Processing unit 25 is actuated. If the web tension value of the first material web 5 or of the first endless web of material 10 measured by the web tension measuring device 21 is less than the web tension desired value, then the drive 29 causes the braking moment of the main web. Roller 26 increases or reduces the drive torque of the main roller 26, which causes an increase in the web tension actual value of the first material web 5 or the first endless material web 10. The web tension is changed by the drive 29 up to a predetermined first web tension limit value.

If the actual web tension value measured by the web tension measuring device 21 is greater than the web tension desired value, then the drive unit 29 reduces the braking torque of the main roller 26 or increases the drive torque of the main roller 26, which causes a corresponding reduction of the web tension actual value.

If it is necessary to change the web tension beyond the first web tension limit value, the information processing unit 25 actuates the second drive 30 via the line 32. The drive 30 increases the moment of the main roller 26 applied by the drive 29 , Thus, when the drive 29 applies a braking torque to the first material web 5 or the first endless material web 10 via the main roller 26, the drive 30 also applies a braking torque via the main roller 27 on the first material web 5 and the first endless material web 10 on. Conversely, the drive 30 via the main roller 26, a drive torque on the first material web 5 and the first endless material web 10 applies when the drive 29 via the main roller 27 a driving torque on the first material web. 5 or the first endless material web 10 applies. The drive 29 emits a maximum torque at the first web tension limit value. The wrap angles around the main rollers 26, 27 can remain constant as the web tension changes.

The web tension of the first material web 5 is set in such a way that it is smaller, preferably substantially smaller, at the first splicing device 2 or at the currently active material roll 6, 8 than at the entrance to the corrugated board production device 4 is.

Furthermore, the second web tension control device 23 is actuated such that the web tension setpoint at the first splice device 2 is at a minimum but greater than zero.

The second web tension control device 23 is actuated to further reduce the web tension of the first material web 5, 10 when the web tension of the first material web 5, 10 measured by the web tension measuring device 21 is greater than a web tension setpoint the first material web 5, 10 and the first web tension control device 22 is already set to maximum web tension reduction.

The second web tension control device 23 is actuated to further increase the web tension of the first material web 5, 10 when the web tension of the first material web 5, 10 measured by the web tension measuring device 21 is less than a web tension setpoint the first material web 5, 10 and the first web tension control device 22 is already set to maximum web tension increase.

The above-described method for controlling the web tension is basically such that the web tension on the first splicing device 2 or material supply device is as small as possible. The web tension of the first material webs 5, 10 entering the corrugating machine 4 is set upstream of the corrugator 4. At the respective first material web 5, 10, first the web tension control device 22 is brought into action, which is arranged immediately upstream of the corrugated cardboard production device 4. If, for example, the braking torque applied by this web tension control device does not suffice, then the web tension control device 23, 53 located upstream in each case is activated in addition to the web tension increase.

If it is necessary to change the web tension beyond the second web tension limit value, the information processing unit 25 actuates the third drive 55 via the line 56. The drive 55 increases the moment applied by the main rollers 26, 27. Thus, if the drive 29 via the main roller 26 and the drive 30 via the main roller 27 each apply a braking torque to the first material web 5 and the first endless material web 10, so also brings the drive 55 on the main roller 54 on a corresponding braking torque.

Conversely, if necessary, the drive 55 via the main roller 54 a drive torque on the first material web 5 and the first endless material web 10 applies when the drive 29 via the main roller 27 and the drive 30 via the main roller 26 in each case a drive torque on the first material web 5 and the first endless material web 10 apply.

The drives 29, 30 deliver a maximum torque at the second web tension limit value, at which point the drive 55 becomes active.

Furthermore, the third web tension control device 53 is also actuated such that the web tension setpoint at the first splice device 2 is at a minimum but greater than zero.

The third web tension control device 53 is actuated to further reduce the web tension of the first material web 5, 10 when the web tension of the first material web 5, 10 measured by the web tension measuring device 21 is greater than a web tension setpoint the first material web 5, 10 and the first and second web tension control means 22, 23 are already set to maximum web tension reduction.

The third web tension control device 53 is actuated to further increase the web tension of the first material web 5, 10 when the web tension of the first material web 5, 10 measured by the web tension measuring device 21 is less than a web tension setpoint the first material web 5, 10 and the first and second web tension control means 22, 23 are already set to maximum web tension increase.

If, for example, the braking torque applied by the second web tension control device does not suffice, the third web tension control device 53, which is located upstream in each case, is activated in addition to the web tension increase.

In this way, the web tension generated at the first splice device 2 may be as low as possible, less than the desired value at the corrugated board production device 4, which is usually three to four times the web tension at the splice device 2. The lower web tension on the splicing device 2 has the advantage that thereby wrinkling in the splicing device 2 is minimized. As already mentioned, the web tension generated at the first splice device 2 is as small as possible, but greater than zero.

The following is with reference to FIG. 2 the second embodiment of the invention described. Identical components are given the same reference numerals as in the previous embodiment, to which reference is hereby made. In contrast to the first embodiment is in the embodiment according to FIG. 2 the second material web 11 and the second endless material web 16 are corrugated. The first material webs 5, 10 are here uneven fluted deck sheets and are regulated again. Starting from the corrugated board production device 4, the web tension measuring device 20 with the web tension measuring device 21 and the first web tension control device 22, the second one, are here in the upstream direction on the first material web 5 Web tension control device 23 and the third web tension control device 53 arranged. Upstream of the third web tension control device 53 is the first material supply device 2, from which the first material web 5 is discharged. If necessary, the web tension control devices 22, 23, 53 are actuated again from the corrugated cardboard production device 4 in the direction of the first material supply device 2.

According to an alternative embodiment, the second web tension control device 23 and the third web tension control device 53 are arranged interchanged with respect to one another. The second web tension control device 23 then forms the third web tension control device, while the third web tension control device 53 forms the second web tension control device.

In a further preferred embodiment, the web tension of the first and second material webs 5, 11 and the first and second endless material webs 10, 16 is changed. Starting from the corrugated cardboard production device 4, in each case the web tension measuring control device 20 with the web tension measuring device 21 and 15 are here in the upstream direction both on the first material web 5 and on the second material web 11 the first web tension control device 22, the second web tension control device 23 and the third web tension control device 53. Upstream of the third web tension control device 53, the first material supply device 2 is arranged, from which the first material web 5 is discharged. Upstream of the other third web tension control device 53, the second material supply device 3 is arranged, from which the second material web 11 is discharged. If necessary, the web tension control devices 22, 23, 53 are again removed from the corrugated board production device 4 operated out in the direction of the first material supply device 2 and on the second material supply device 3.

Claims (33)

1. Corrugated board system for producing corrugated board with

   a) a first material supply device (2) for dispensing a first material web (5, 10),

   b) at least a second material supply device (3) for dispensing at least a second material web (11, 16),

   c) a corrugated board production device (4) for producing a corrugated board web (1) lined on at least one side from the first material web (5, 10) and the at least second material web (11, 16),

   d) a web tension measuring regulating arrangement, which is arranged between the corrugated board production device (4) and the first material supply device (2), wherein the web tension measuring regulating arrangement comprises

   i) a web tension measuring regulating device (20) with a web tension measuring mechanism (21) for measuring the web tension of the first material web (5, 10) and a first web tension regulating mechanism (22) for regulating the web tension of the first material web (5, 10), and

   ii) at least a second web tension regulating mechanism (23) to further regulate the web tension of the first material web (5, 10), the web tension measuring regulating device (20) being arranged between the second web tension regulating mechanism (23) and the corrugated board production device (4), and

   iii) an information processing unit (25), which

   - is connected to the web tension measuring regulating device (20) in a data-transmitting manner,

   - is connected to the second web tension regulating mechanism (23) in a data-transmitting manner,

   - receives web tension information on the first material web (5, 10) from the web tension measuring mechanism (21),

   - is configured in such a way that to change the web tension of the first material web (5, 10) up to a first web tension limit value, it sends web tension regulating signals to the first web tension regulating mechanism (22) to actuate it, and

   - is configured in such a way that to change the web tension of the first material web (5, 10) beyond the first web tension limit value, it sends web tension regulating signals to the second web tension regulating mechanism (23) to actuate it.
2. Corrugated board system according to claim 1, characterised in that provided at the first material supply device (2) is at least one web tension regulating apparatus, which is connected to the information processing unit (25) to change the web tension of the first material web (5, 10) at the first material supply device (2) in a data-transmitting manner.
3. Corrugated board system according to claim 1 or 2, characterised in that the first and/or the at least second web tension regulating mechanism (22, 23) comprises a braking means for increasing the web tension of the first material web (5, 10) and/or an acceleration means to reduce the web tension of the first material web (5, 10).
4. Corrugated board system according to claim 3, characterised in that the braking means and/or the acceleration means is formed by a roller (26, 27), which is in contact with the first material web (5, 10) and can be decelerated and/or accelerated.
5. Corrugated board system according to claim 4, characterised in that the roller (26, 27) can be decelerated and/or accelerated by a drive (29 or 30).
6. Corrugated board system according to any one of the preceding claims, characterised in that the corrugated board production device (4) has a fluting mechanism for fluting the first and/or the at least second material web (5, 10, 11, 16) and a connecting mechanism for the rigid flat connection of the first and the at least second material web (5, 10, 11, 16) to one another, the connecting mechanism preferably having a gluing unit and a lining unit.
7. Corrugated board system according to any one of the preceding claims, characterised in that the web tension measuring mechanism (21) and the first web tension regulating mechanism (22) form a unit.
8. Corrugated board system according to any one of the preceding claims, characterised in that the first and /or the at least second material supply device (2, 3) is configured as a splice device.
9. Corrugated board system according to any one of the preceding claims, characterised in that the first web tension regulating mechanism (22) increases the web tension of the first material web (5, 10) only up to the first web tension limit value and the web tension of the first material web (5, 10) can be increased by the second web tension regulating mechanism (22) beyond the first web tension limit value.
10. Corrugated board system according to any one of the preceding claims, characterised in that the web tension of the first material web (5, 10) at the first material supply device (2) is lower, preferably substantially lower, than at the corrugated board production device (4), the web tension of the first material web (5, 10) at the first material supply device (2) preferably being greater than zero.
11. Corrugated board system according to any one of the preceding claims, characterised in that the web tension measuring regulating arrangement has at least a third web tension regulating mechanism (53) to further regulate the web tension of the first material web (5, 10), the at least third web tension regulating mechanism (53) being connected to the information processing unit (25) in a data-transmitting manner.
12. Corrugated board system according to claim 11, characterised in that the at least third web tension regulating mechanism (53) is arranged upstream of the second web tension regulating mechanism (23) on the first material web (5, 10).
13. Corrugated board system according to claim 11 or 12, characterised in that the information processing unit (25) is configured in such a way that to change the web tension of the first material web (5, 10) beyond a second web tension limit value, it sends web tension regulating signals to the at least third web tension regulating mechanism (53) to actuate it.
14. Corrugated board system according to claim 13, characterised in that upon an intentional increase of the web tension of the first material web (5, 10), the second web tension limit value is greater than the first web tension limit value.
15. Corrugated board system according to claim 13 or 14, characterised in that upon a further reduction of the web tension of the first material web (5, 10), the second web tension limit value is lower than the first web tension limit value.
16. Method for producing corrugated board, comprising the steps:

    - dispensing a first material web (5, 10) from a first material supply device (2),

    - dispensing at least a second material web (11, 16) from at least a second material supply device (3),

    - producing a corrugated board web (1) lined at least on one side from the first material web (5, 10) and the at least second material web (11, 16) using a corrugated board production device (4),

    - providing a web tension measuring regulating arrangement, which is arranged between the corrugated board production device (4) and the first material supply device (2), wherein the web tension measuring regulating arrangement

    -- measures and regulates the web tension of the first material web (5, 10) using a web tension measuring regulating device (20), which, for this purpose, comprises a web tension measuring mechanism (21) and a first web tension regulating mechanism (22), and

    -- if necessary further regulates the web tension of the first material web (5, 10) using at least a second web tension regulating mechanism (23), the web tension measuring regulating device (20) being arranged between the second web tension regulating mechanism (23) and the corrugated board production device (4), and

    - providing an information processing unit (25), which

    -- is connected to the web tension measuring regulating device (20) in a data-transmitting manner,

    -- is connected to the at least second web tension regulating mechanism (23) in a data-transmitting manner,

    -- receives web tension information on the first material web (5, 10) from the web tension measuring mechanism (21),

    -- sends web tension regulating signals to change the web tension of the first material web (5, 10) up to a first web tension limit value to the first web tension regulating mechanism (22) to actuate it, and

    -- sends web tension regulating signals to further change the web tension of the first material web (5, 10) beyond the first web tension limit value to the at least second web tension regulating mechanism (23) to actuate it.
17. Method according to claim 16, characterised in that the first web tension regulating mechanism (22) changes the web tension of the first material web (5, 10) substantially up to its maximum regulating power and only then is the at least second web tension regulating mechanism (23) optionally used to further change the web tension of the first material web (5, 10).
18. Method according to claim 16 or 17, characterised in that the at least second web tension regulating mechanism (23) arranged upstream of the first web tension regulating mechanism (22) is used when a further web tension change of the first material web (5, 10) is impossible by means of the first web tension regulating mechanism (22).
19. Method according to any one of claims 16 to 18, characterised in that the web tension of the first material web (5, 10) is regulated in such a way that when a desired web tension is input at the inlet of the corrugated board production device (4), the web tension at the outlet of the first material supply device (2) is minimal, but greater than zero.
20. Method according to any one of claims 16 to 19, characterised in that the web tension of the first material web (5, 10) between the first material supply device (2) and the corrugated board production device (4) is regulated in such a way that the web tension of the first material web (5, 10) remains the same in portions and changes in a step-like manner at the first web tension regulating mechanism (22), when the latter is in use.
21. Method according to any one of claims 16 to 20, characterised in that the web tension of the first material web (5, 10) between the first material supply device (2) and the corrugated board production device (4) is regulated in such a way that the web tension of the first material web (5, 10) remains the same in portions and changes in a step-like manner at the at least second web tension regulating mechanism (23), when the latter is in use.
22. Method according to any one of claims 16 to 21, characterised in that the first web tension regulating mechanism (22) increases the web tension of the first material web (5, 10) when the web tension of the first material web (5, 10) measured by the web tension measuring mechanism (21) is lower than a web tension desired value of the first material web (5, 10).
23. Method according to any one of claims 16 to 22, characterised in that the first web tension regulating mechanism (22) reduces the web tension of the first material web (5, 10), when the web tension of the first material web (5, 10) measured by the web tension measuring mechanism (21) is greater than a web tension desired value of the first material web (5, 10).
24. Method according to any one of claims 16 to 23, characterised in that the at least second web tension regulating mechanism (23) is only actuated when the web tension of the first material web (5, 10) measured by the web tension measuring mechanism (21) differs from a web tension desired value of the first material web (5, 10) and the first web tension regulating mechanism (22) is adjusted to maximum web tension change.
25. Method according to any one of claims 16 to 24, characterised in that the web tension measuring regulating arrangement has at least a third web tension regulating mechanism (53) to further regulate the web tension of the first material web (5, 10), the at least third web tension regulating mechanism (53) being connected to the information processing unit (25) in a data-transmitting manner.
26. Method according to claim 25, characterised in that the at least third web tension regulating mechanism (53) is arranged upstream of the second web tension regulating mechanism (23) on the first material web (5, 10).
27. Method according to claim 25 or 26, characterised in that the information processing unit (25) is configured in such a way that to change the web tension of the first material web (5, 10) beyond a second web tension limit value, it sends web tension regulating signals to the at least third web tension regulating mechanism (53) to actuate it.
28. Method according to claim 27, characterised in that upon an intentional increase in the web tension of the first material web (5, 10), the second web tension limit value is greater than the first web tension limit value.
29. Method according to claim 27 or 28, characterised in that upon a further reduction in the web tension of the first material web (5, 10), the second web tension limit value is lower than the first web tension limit value.
30. Method according to any one of claims 25 to 29, characterised in that the second web tension regulating mechanism (23) changes the web tension of the first material web (5, 10) substantially up to its maximum regulating power and only then is the at least third web tension regulating mechanism (53) optionally used to further change the web tension of the first material web (5, 10).
31. Method according to any one of claims 25 to 30, characterised in that the at least third web tension regulating mechanism (53) arranged upstream of the second web tension regulating mechanism (23) is used when a further web tension change of the first material web (5, 10) by the second web tension regulating mechanism (23) is impossible.
32. Method according to any one of claims 25 to 31, characterised in that the web tension of the first material web (5, 10) between the first material supply device (2) and the corrugated board production device (4) is regulated in such a way that the web tension of the first material web (5, 10) remains the same in portions and changes in a step-like manner at the at least third web tension regulating mechanism (53) when the latter is in use.
33. Method according to any one of claims 25 to 31, characterised in that the at least third web tension regulating mechanism (53) is only actuated when the web tension of the first material web (5, 10) measured by the web tension measuring mechanism (21) differs from a web tension desired value of the first material web (5, 10) and the second web tension regulating mechanism (23) is adjusted to the maximum web tension change.

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