Method for operating a corrugator, corrugator, computer programme product, and paper roll

Abstract

A method for operating a corrugated board machine (2) is described, wherein the corrugated board machine (2) serves to produce a corrugated board web (4) and has a number of adjustable operating parameters (6) for this purpose, wherein a number of paper rolls (12) are fed to the corrugated board machine (2), each containing a paper web made of the paper from which the corrugated board web (4) is produced, wherein the paper of each paper roll (12) is characterized by a number of paper parameters (14) which have individual values ​​for each of the paper rolls (12), so that the paper of each paper roll (12) is individually characterized on the basis of its values ​​for the paper parameters (14), wherein the operating parameters (6) are set depending on the values ​​of the paper parameters (14) so ​​that the production of the corrugated board web (4) is individually adapted to the paper of the respective paper roll (12) fed in.Furthermore, a corrugated board plant (2), a computer program product and a paper roll (12) are specified.

Description

[0001] The invention relates to a method for operating a corrugated board plant, as well as a corrugated board plant, a computer program product and a paper roll.

[0002] A corrugating machine is used to produce a sheet of corrugated board. The machine is fed with several sheets of paper in the form of paper rolls. These rolls are unwound by a separate unwinder on the machine, and the resulting sheets are then bonded together by several processing units to form a corrugated board sheet. For example, one sheet of paper might be corrugated with a corrugating roller and then glued to two uncorrugated sheets. Multi-layer corrugated boards with more than one corrugated sheet are also possible. The finished corrugated board sheet can then be optionally finished using the machine, meaning it is cut into individual pieces and, if necessary, slit and / or scored.

[0003] The quality of the produced corrugated board web depends on the one hand on the selection of appropriate values ​​for the operating parameters of the corrugating machine during operation (i.e., during web production), and on the other hand on the properties of the paper webs from which the corrugated board web is produced. The operating parameters are set, for example, either manually by an operator or automatically based on measurements taken by sensors directly in front of each processing unit (inline measurement). This allows for adjustments to both changing environmental conditions and varying properties of the paper webs.For example, temperature and humidity controls are conceivable for adjusting the temperature and humidity of a respective paper web as part of a control system for the corrugated board plant, in order to influence the processing result of a respective processing unit as optimally as possible.

[0004] US Patent 11,162,226 B2 describes a process in which a paper web is conditioned with a liquid film to achieve a specific moisture content. The conditioning depends on a hygroexpansion attribute, which is measured for or assigned to the paper web. The measurement of the hygroexpansion attribute is based on a subsequent measurement of the shape of the finished corrugated board, from which the hygroexpansion attribute is then calculated, allowing similar paper webs to be assigned the same hygroexpansion attribute. Similarly, the general assignment of the hygroexpansion attribute is also based on the principle that similar paper webs can be assigned the same hygroexpansion attribute.

[0005] EP 0 536 518 A1 discloses an automatic setting system for a corrugated board machine. This system allows the various rollers to be automatically brought into an ideal state, thereby increasing the productivity of corrugated board sheets. The setting system includes a contact pressure setting device and a gap adjustment device to allow for variable adjustment of the production parameters.

[0006] The JP H01 316257 A describes a control method for a corrugated board plant in which several paper rolls each have individual paper parameters, so that an assignment rule is able to link individual paper parameters of very different rolls with a quality parameter.

[0007] Additionally, reference is made to US 10,095,206 B2, EP 3 392 649 B1, EP 3 369 564 B1, EP 2 572 038 B1, EP 2 406 616 B1, EP 2 391 505 B1, EP 1 902 833 A1, EP 0 936 059 A2, DE 10 2017 219 064 A1, DE 10 2015 206 650 A1, CN 107 458 032 A, CN 107 631 684 A, CN 112 644 092 B, CN 207 105 756 U, CN 210 553 357 U, WO 2012 / 069 697 A1, JP 2007 112 024 A and GB 2 021 039 A.

[0008] Against this background, an object of the invention is to improve the production of a corrugated board web. To this end, a suitable method for operating a corrugated board machine, a corresponding corrugated board machine, a computer program product, and an advantageous paper roll are to be specified.

[0009] The problem is solved according to the invention by a method with the features of claim 1, a corrugated board machine with the features of claim 13, a computer program product with the features of claim 14, and a paper roll with the features of claim 15. Advantageous embodiments, further developments, and variants are the subject of the dependent claims. The descriptions relating to the method also apply mutatis mutandis to the corrugated board machine, the computer program product, and the paper roll, and vice versa. Where steps of the method are specified below, advantageous embodiments for the corrugated board machine result from its configuration to perform one or more of these steps (in particular by means of a control unit of the corrugated board machine).Similarly, advantageous configurations for the computer program product result from the fact that it includes commands which, when executed by a corrugated board plant, cause it to perform one or more of these steps.

[0010] A key concept of the invention is in particular the use of paper data in a corrugated board plant and the feeding (also transmission) of this paper data to the corrugated board layer.

[0011] This method is used to operate a corrugated board machine. This machine, in turn, produces a corrugated board web and has a number of adjustable operating parameters. An operating parameter is set by selecting and setting a value for that parameter. The operating parameters control the behavior of one or more processing units of the corrugated board machine. Examples of processing units include unwinders, splicers, printers, single facers, bridges, preheaters, glue units, double facers, drying sections, cutting units, slitting units, creasing units, and the like. However, the details of the processing units are not relevant here. Examples of operating parameters include: feed speed, tension, ink quantity, corrugating roller temperature, glue quantity, water quantity for moistening, drying temperature, cutting and / or creasing position, and the like.The details of the processing parameters are also not important at this time.

[0012] In this process, a number of paper rolls are fed into the corrugating machine, each containing one (i.e., at least one) paper web from which the corrugated board web is produced. In other words, the corrugating machine is fed with a number of paper rolls during operation. "A number of" here, and more generally, means "one or more" or "at least one." Each paper roll consists of a paper web and a core (also called a bushing) on ​​which the paper web is wound. The corrugating machine unwinds this paper web using a dispenser to produce the corrugated board web and connects it to other paper webs from additional paper rolls. Each paper web is made of paper or consists of paper. The processing units then process the paper webs according to the operating parameters, i.e.,Each operating parameter is assigned to at least one of the processing units and defines their behavior in operation and thus the processing of the paper web by this processing unit.

[0013] The corrugated board machine is fed multiple paper rolls in two main ways. Firstly, several paper rolls are fed onto the corrugated web, their paper webs being bonded together to form different layers of the web. This means that several paper rolls for different layers are fed more or less simultaneously. Secondly, several paper rolls are also fed onto the corrugated web sequentially to ensure continuous operation. This means that after one paper roll is used up, a new one is fed in, so that several paper rolls are used for the same layer.

[0014] Each paper roll is characterized by a number of paper parameters, which have individual values ​​for each roll. Thus, each roll is individually characterized by these paper parameter values. More precisely, the paper of each roll is characterized by a number of paper parameters, which have individual values ​​for each roll. The paper parameters therefore specifically characterize the paper of a particular roll. However, for simplicity, we will occasionally refer to the roll as a whole, but in this case, we are referring specifically to the paper within it. The values ​​of the paper parameters for a single roll are also called "paper data" and together form a data set for that roll.Paper parameters describe, directly or indirectly, one or more properties of the paper or paper roll, such that different values ​​signify or imply different properties. The term "paper parameter" is broadly defined and encompasses not only the physical, mechanical, and chemical properties of the paper itself, but also any information that allows for its characterization, such as the place of manufacture, the time of manufacture, the storage duration of the paper, or the operating parameters of a paper machine during paper production, and so on. Paper data, when appropriately configured, consists of averaged values, spatially and / or temporally resolved values ​​(e.g., spatially resolved moisture content along the length and width of the paper web), or a combination thereof.The exact paper parameters used are initially of secondary importance; what is more important here is that the values ​​of the paper parameters are available individually for each of the paper rolls. For example, the paper parameter is a fiber orientation of the paper in the paper roll, and the corresponding value is a for the first paper roll, b for the second paper roll, and c for the third paper roll.

[0015] The value of the paper parameter is therefore unique to each paper roll (more precisely: to its paper), which does not preclude two paper rolls from having the same value for a specific paper parameter. As a rule, however, the paper from two paper rolls differs in one or more of the paper parameters due to their production, storage, transport, etc., and thus exhibits different properties. This individuality of the paper rolls is taken into account and utilized during the operation of the corrugated board machine and thus during the processing of the paper rolls to optimize the production of the corrugated board web. For this purpose, the operating parameters of the corrugated board machine are set depending on the values ​​of the paper parameters (i.e., depending on the paper data), so that the production of the corrugated board web is individually adapted to the paper roll (i.e., its paper) being processed at any given time.In other words, since the properties of the paper regularly differ from roll to roll (and possibly even along a single roll), the operation of the corrugating machine is adjusted accordingly to the specific roll being used, preferably on a recurring and / or continuous basis. The paper data is not determined, or not exclusively determined, within the corrugating machine itself, but rather beforehand and, in particular, independently of and separate from the machine. Advantageously, the paper data includes the history and / or previous life cycle of the paper on the roll, so that the paper data essentially represents a life cycle of the paper roll.In particular, the paper data does not necessarily only contain those paper parameters that could also be determined inline in the corrugated board machine, but advantageously also those paper parameters that are inherently inaccessible to determination within the corrugated board machine, e.g., paper manufacturing process parameters. The method presented here is therefore dynamic in that it takes into account the individual properties of the paper roll. The above applies analogously to the simultaneous processing of several paper rolls, whose paper data are then used jointly to set the operating parameters. The paper parameters themselves—and thus the paper data as a whole—are either static, i.e., constant for the paper of an entire paper roll, or dynamic, i.e., vary along the paper of the paper roll, so that, for example,This results in a parameter profile that depends on the currently unwound section of the paper web. A combination is also possible, so that one or more paper parameters are static and one or more other paper parameters are dynamic.

[0016] For the purposes of this discussion, it is assumed, without limitation of generality, that several paper rolls, each with multiple paper parameters, are present, and that several operating parameters are also set depending on the paper parameters. This is also generally preferred.

[0017] The advantage here is that the paper parameters of a given paper roll are used to adjust the operating parameters of the corrugated board machine, and thus, in particular, directly for setting the operating parameters and therefore also for controlling the corrugated board machine. This contrasts with the aforementioned US 11,162,226 B2, in which a hygroexpansiveness attribute is first assigned to a given paper roll based on a comparison with other paper rolls, and the conditioning within the corrugated board machine is then adjusted based on this attribute. Thus, in US 11,162,226 B2, the operating parameters are not adjusted based on the specific properties of a given paper roll. Furthermore, in US 11,162,226 B2, the assignment is based on a purely data-driven model that is correlated across several corrugated board machines from different manufacturers, essentially comparing the operating parameters of the corrugated board machines with each other.However, this approach assumes similar or even unchanged paper data (e.g., same manufacturer or same production batch). In other words, the approach in US 11,162,226 B2 aims to utilize data from different corrugating machines, whereas the present invention aims to utilize paper data from paper rolls with regularly varying paper properties, possibly even for only a single corrugating machine.

[0018] Generally speaking, outside of the corrugated board plant, specific paper parameters of a paper roll, even if these parameters were known, are not currently used to control the corrugated board plant. This is not inherently necessary, as focusing solely on the corrugated board layer itself allows for feedback control, where the operating parameters are adjusted based on the produced corrugated board web. However, such a reaction, and the subsequent adjustments that inevitably follow, inevitably lead to the production of rejects or at least a suboptimal product in the interim, thus reducing the efficiency of the corrugated board plant. In contrast, the corrugated board plant presented here features a significantly shorter control loop due to its use of paper parameters for control.Since the paper parameter values ​​are known very early in the process, and especially before the paper roll is even processed, the control system reacts accordingly and proactively to any changes in these values. Therefore, this control system is primarily a feedforward control system. In contrast, with a feedback control system, as already described, the manufactured output product (the corrugated board web) would be analyzed, and the operating parameters would then be controlled retrospectively based on this analysis; that is, the output product provides the input signal for the control system. However, in the feedforward control system described here, which is advantageously used, the input product (the paper roll) provides the input signal for the control system to control (more precisely: regulate) the operating parameters and obtain a specific output product.

[0019] Preferably, the paper parameter values ​​used for a single paper roll are aggregated as much as possible, meaning they are received by the corrugating machine from as few different sources as possible, and preferably from only one source, and thus presented as a single, consolidated data set. The paper data is therefore preferably not transferred to the corrugating machine at different points and / or times, but rather collected in a single data set and / or at a single point in time. Optionally, the paper data from several paper rolls is aggregated analogously, in such a way that individual values ​​can still be assigned to a specific paper roll, expediently by means of an ID for each paper roll.

[0020] The invention utilizes the observation that the properties of the paper in a paper roll are fundamentally determined by its production and can subsequently change during its journey (transport, storage, and the like). When the paper roll is actually fed into the corrugated board machine and processed, the values ​​of the paper parameters of each individual roll have developed according to its unique life cycle, meaning that essentially no two paper rolls are completely identical. While it is generally possible to keep the properties of different paper rolls as similar as possible by treating them largely identically until processing, so that processing under the same operating parameters results in tolerable variations in the quality of the corrugated board web, this does not guarantee complete uniformity.This may be sufficient in many cases in practice, but in any case it requires adherence to certain tolerances in the production of the paper.

[0021] The invention further unlocks the potential arising from the fact that the properties of the paper in each individual paper roll are taken into account, so that even small differences are compensated for by adjusting the operating parameters accordingly. This allows for the production of a corrugated board web of maximum quality, starting from a paper roll with given properties. A further advantage of the invention described here is that paper rolls with greater tolerances can be produced, since any deviations from ideally defined values ​​for the paper parameters are now optimally compensated for during operation of the corrugated board machine. This makes the production of paper and paper rolls in general simpler and more cost-effective. Furthermore, it now allows the use of paper rolls that would previously have been rejected due to excessive defects.It is now also possible to use paper rolls that are not typically intended for corrugated board production, because thanks to the now known paper data and its applications, virtually any paper roll can be optimally and effectively used for corrugated board manufacturing. Ultimately, this makes paper and paper rolls more cost-effective to produce or procure, with a corresponding benefit for the corrugated board web.

[0022] The present case thus utilizes the individual properties of the paper in a paper roll to optimize the process control of the corrugated board machine. In other words, the individual properties of a paper roll are used to control the corrugated board machine, so that its operation then depends on the individual values ​​of the paper parameters of each paper roll. The corrugated board machine is thus controlled on a roll-by-roll basis. This requires, in particular, that the paper data of each paper roll is known and available before processing, and preferably as early as possible, and is therefore not determined by sensors immediately before each processing station. Preferably, the paper data is already known before the paper is fed into the corrugated board machine.Alternatively or additionally, the paper parameters of each paper roll are measured within the corrugated board machine using suitable sensors. However, this measurement is not taken immediately before or even after a processing unit, but rather as the paper roll is unwound from the unwinder or immediately afterward, i.e., before the paper web is processed in a processing unit (e.g., printer, single facer, preheater, gluing unit). Accordingly, the method presented here differs from inline measurement precisely in that the paper data for the paper roll is proactively supplied and, more importantly, utilized, rather than only when needed or retrospectively. This prevents suboptimal products and rejects.

[0023] One advantage is that the paper data can be used, and is expediently used, for the plausibility check, calibration, or testing of sensors in the corrugated board machine. The value of a paper parameter is then determined by a sensor in the corrugated board machine and compared with the value stored for that paper parameter in the paper data. Based on this, at least the aforementioned options for action—plausibility check, calibration, and testing of the sensor—can be implemented. For example, moisture sensors in the corrugated board machine exhibit a measurement inaccuracy, which is corrected and / or correlated using the paper parameter "moisture" from the paper roll data.

[0024] A further advantage is that, using the paper data, preferably the temperature and humidity of the paper, the energy required to produce a corrugated board web from the respective paper roll (i.e., to process the paper roll) can be determined. Accordingly, in a suitable embodiment, the energy requirement is calculated based on the paper data of a paper roll, indicating how much energy is needed to produce a corrugated board web from the paper roll.

[0025] Preferably, values ​​for the operating parameters are selected according to a rule that links the paper parameter values ​​with the operating parameter values ​​in such a way that a quality measure for the corrugated board web is modified, in particular improved, and especially maximized. The quality measure is essentially arbitrary; an example of a suitable quality measure is the degree of warping of the corrugated board web, also known as "warp," or the percentage of rejects, i.e., the proportion of the corrugated board web that is unusable due to defective manufacturing. Another suitable quality measure is a strength value of the corrugated board web, in particular edge crush resistance (e.g., according to the ECT = Edge Crush Test), flat crush resistance (e.g., according to the FCT = Flat Crush Test), or the like, and generally any corrugated board property. A combination of several quality measures is also advantageous.The rule is learned in a suitable form, meaning it is generated beforehand in a learning process in which the quality measure is measured as a function of the paper parameters and the operating parameters. The rule is then derived from this function. Various approaches are suitable for the learning process; the details are not important here.

[0026] In this case, the operating parameters are advantageously set not only indirectly, but directly depending on the values ​​of the paper parameters.

[0027] The previously described procedure is, in particular, a function for which the paper parameters are input parameters and the operating parameters are corresponding output parameters. The corrugated board machine directly converts the paper parameter values ​​into suitable values ​​for the operating parameters according to the (predefined) procedure, and these values ​​are then set. Preferably, no intermediate parameters are determined. This contrasts with the aforementioned US 11,162,226 B2, in which the hygroexpansiveness attribute is first determined for a given paper web in order to obtain suitable operating parameters for conditioning the paper web. This is unnecessary here, as the aforementioned procedure directly links the paper parameters with the operating parameters, thereby eliminating the need for corresponding calculations and preliminary considerations.This approach is based on the understanding that knowledge of the underlying relationships or causalities is not essential; rather, it suffices to empirically determine the rule beforehand through appropriate experiments, training methods, and / or a big data approach. In this sense, the rule itself is not necessarily known, but rather a kind of black box that simply outputs corresponding values ​​for the operating parameters based on given paper data. For example, the rule might be implemented using a neural network or similar technology, such as a virtual sensor. In principle, various solutions are conceivable and suitable, achieving similar or identical results in different ways.

[0028] Which specific paper parameters are used is initially of secondary importance and becomes less relevant as the number of paper parameters increases. Accordingly, preferably at least 10 paper parameters are used, and in particular at least 100. The total volume of paper data results primarily from the number of values ​​stored for each paper parameter. A static paper parameter contains only a single value (e.g., linear meters on the paper roll, production date, or the average value of a dynamic paper parameter), while a dynamic paper parameter contains a multitude of values ​​(e.g., moisture content as a function of the width and length of the paper roll), which depends in particular on the value density / sampling rate (e.g., 1 / cm) and is typically in the range of 1,000 to 1,000,000 or more.The paper parameters do not necessarily have to be in a directly recognizable, causal relationship to the quality measure for the corrugated board web. Especially with the aforementioned big data approach, knowledge of such relationships is of secondary importance. However, some paper parameters regularly have a greater influence on the quality of the corrugated board web than others and are therefore preferred, particularly when only a few (i.e., at most 10) paper parameters are used. Therefore, in a suitable configuration, one or more of the paper parameters are selected from the following: fiber orientation of the paper on the paper roll, failure stress of the paper on the paper roll.

[0029] In a suitable embodiment, two of the paper rolls fed to the corrugated board machine for simultaneous processing are selected such that they differ from each other in at least one of the paper parameters by no more than a maximum value. In other words, the two paper rolls being processed simultaneously are as similar as possible. Setting the operating parameters based on the paper parameter values ​​is simplified by selecting paper rolls that are as identical as possible. This is particularly advantageous with regard to moisture content. Accordingly, in a suitable embodiment, one of the paper parameters is the moisture content of the paper in each respective paper roll.Advantageously, two of the paper rolls (which are fed to the corrugating machine for simultaneous processing) are selected such that their moisture content differs from each other by no more than a maximum value, in particular 2% (relative to each other). In other words, paper rolls with the most similar moisture content possible are selected. The two paper rolls are then processed simultaneously and form, in particular, different layers of the corrugated board web, preferably two outer layers of the corrugated board web, i.e., a top and a bottom layer. This is based on the consideration that if the moisture content differs too much, i.e., if the difference exceeds the maximum value, the production of a corrugated board web may no longer be possible or at least cannot be guaranteed with sufficient quality.Since the paper parameters are advantageously accessible in this case, it is possible to select the paper rolls in such a way that they are optimally suited to each other, especially with regard to the respective moisture content of the paper as described.

[0030] It is particularly preferred that at least one of the paper parameters be a dynamic paper parameter whose values ​​are specified as a function of the width and / or length of the paper web on the paper roll. In contrast, static paper parameters have the same value along the entire paper web. Suitable dynamic paper parameters are: fiber orientation as a function of the width and / or length of the paper web, temperature as a function of the width and / or length of the paper web, e.g., in the form of a "heat map" which indicates the temperature at a specific point on the paper web, and humidity as a function of the width and / or length of the paper web, analogously, e.g., in the form of a "moisture map." A dynamic paper parameter is characterized by the fact that it potentially has different values ​​at different points on the paper web and thus describes an inhomogeneity of the paper roll.Using one or more dynamic paper parameters provides a more detailed picture of the paper roll, which is advantageous when setting the operating parameters. The operating parameters are then dynamically adjusted accordingly.

[0031] It is also advantageous to use papermaking process parameters, i.e., process parameters used in the production of the paper for a particular paper roll. These papermaking process parameters are not direct properties of the paper itself (such as moisture content, fiber orientation, length, width, etc.), but rather parameters of the papermaking process and thus only indirect paper parameters. In a suitable configuration, the paper parameters comprise a number of papermaking process parameters used in the production of the paper roll. These papermaking process parameters are, in particular, operating parameters of a paper machine used to produce the paper roll and / or the paper from the paper roll.The papermaking process parameters are advantageously used to establish a correlation between the production of the corrugated board and the production of the paper used in the process, a correlation that may not be apparent in the direct paper parameters. Subsequent determination of other paper parameters, such as failure stress and fiber orientation, temperature, humidity, and the like, may therefore be unnecessary, and in an advantageous embodiment, these parameters can be omitted entirely or partially. This approach utilizes the understanding that the production of the paper roll ultimately significantly influences its properties, and that the production process is, in turn, significantly influenced by the papermaking process parameters. Therefore, these parameters are advantageously used directly to adjust the operating parameters of the corrugated board machine.

[0032] Suitable paper parameters are listed below: a) Paper roll properties (exact): Core outer diameter (exact), linear meters on the paper roll, splice points in the paper roll. b) Paper history: Production date, manufacturer's name, place of manufacture, date of manufacture, storage time, storage conditions (e.g., ambient humidity and / or temperature), transport duration, transport conditions (e.g., ambient humidity and / or temperature). c) Basic paper properties: Moisture / moisture content, basis weight, thickness, ash content, fiber orientation (also fiber orientation angle). d) Tensile properties of the paper: Breaking strength, tear length, elongation at break, modulus of elasticity. e) Surface / printability properties of the paper: Smoothness, e.g., according to Bekk; Roughness, e.g., according to Bendtsen; Air permeability, e.g., according to Bendtsen / Gurley. f) Corrugated board properties (especially corrugated base paper properties): Flat crush resistance (e.g., according to CMT = Concora Medium Test, FCT = Flat Crush Test, or similar); Strip crush resistance (e.g., according to...).(according to SCT = Short Crush Test).

[0033] The above list names preferred paper parameters, but it is not exhaustive. Using only a subset of the listed paper parameters is already advantageous; however, using as many paper parameters as possible is particularly useful.

[0034] Regardless of whether a paper parameter is static or dynamic, those parameters that change as little as possible, or not at all, during the paper roll's lifespan—that is, until it is processed in the corrugated board machine—are particularly suitable. For example, the temperature of a paper roll typically changes during transport from the paper mill to the corrugator and is therefore less suitable (though not entirely unsuitable). Humidity is less problematic than temperature, but it too changes over time. In contrast, the fiber direction (possibly even as a dynamic paper parameter as a function of width and length) remains constant and is therefore particularly suitable.

[0035] Determining the paper parameter values ​​is not necessarily part of the procedure described here for operating the corrugated board machine. Advantageously, at least one, and preferably all, of the paper parameter values ​​for each paper roll are determined in advance, namely before the paper roll is fed into the corrugated board machine. The paper parameter values ​​are thus known before the paper roll is fed into the corrugated board machine and therefore only need to be transmitted to the machine to set the operating parameters. This ensures uninterrupted and fully automatic operation.

[0036] Ideally, the paper parameter values ​​for each paper roll were determined during its production, especially in the case of the paper manufacturing process parameters mentioned above. Alternatively or additionally, the paper parameter values ​​for each paper roll were determined after its production, particularly by means of laboratory analysis. Generally speaking, it is advantageous if at least some of the paper parameters are determined and appropriately stored, e.g., on a data carrier, during or immediately after production, and especially by the paper roll manufacturer themselves, for later transmission to a corrugated board plant.

[0037] An advantage lies in updating one or more paper parameters based on paper data that describes the life cycle of the paper roll, particularly up to its actual processing in the corrugated board plant. This paper data contains, on the one hand, one or more paper parameters that change over time (e.g., temperature or humidity) and, on the other hand, logistics data (i.e., storage, transport, and / or tracking data, e.g., transport duration, transport conditions, storage duration, storage temperature, etc.). The time-varying paper parameter is stored, for example, during or after the production of the paper roll and before its removal from the paper mill, and is subsequently subject to change due to the storage and transport of the paper roll. This change is then tracked using the logistics data in order to update the paper parameters accordingly.(to be recalculated), preferably immediately before or during processing in the corrugated board plant. In a suitable embodiment, a temperature and humidity logger travels with the paper roll on a truck, and the initial paper parameters temperature and humidity from the paper mill are then updated with recorded data from the temperature and humidity logger, e.g. enriched and corrected using a suitable model (e.g. temperature distribution calculations and diffusion equations).

[0038] The corrugating machine expediently has a data interface through which the paper parameter values ​​of each paper roll are transmitted to the machine. These values ​​are transmitted before, during, and / or after the paper roll is fed into the machine, ideally even before it is unwound for processing. In principle, however, it is sufficient if, immediately before each processing station, at least those values ​​specifically required for processing the incoming paper web into that station are transmitted in order to set the operating parameters assigned to that station. However, in line with the preferred predictive approach, all values ​​are preferably transmitted together as a single, aggregated data set via the data interface and are then immediately available.

[0039] In a particularly preferred embodiment, each paper roll is assigned a data carrier on which the individual values ​​of the paper parameters of the respective paper roll are stored. Each data carrier is thus assigned to exactly one paper roll and, in particular, contains only the paper data of that single paper roll. To set the operating parameters based on the paper parameters, the data carrier is preferably read by the corrugated board machine. For this purpose, the corrugated board machine has a suitable reading device. The reading device is, in particular, part of the aforementioned data interface. The data carrier is suitablely a code, e.g., a QR code or barcode, a transponder, e.g., an RFID tag or NFC tag, or a volatile or non-volatile memory, e.g., a floppy disk, a CD, or flash memory. The reading device is accordingly, e.g., a scanner, a receiver with an antenna, a drive, a USB port, or the like.The data carrier enables an offline solution in which the paper parameter values ​​are transmitted to the corrugated board machine without it needing to be connected to the internet or any other network to receive the data set for a particular paper roll.

[0040] The data carrier is either attached to the paper roll or provided separately. In one embodiment, the data carrier is a label or a type of data sheet for the paper roll and is also referred to as a "roll tag." Advantageously, the data carrier can be shipped together with the paper roll. Accordingly, in an advantageous embodiment, the data carrier is attached to the paper roll, e.g., directly to its paper web or to packaging of the paper roll, e.g., affixed or printed directly to the paper or core. This makes the assignment and handling of the data record particularly straightforward. For example, the data carrier is a code attached to the paper roll which is read by a reader when the corrugated board machine is fed into it.

[0041] In principle, it is conceivable that a paper roll is used multiple times (e.g., three times), meaning that after being fed into the corrugated board machine, it is not necessarily completely used up, but only partially, and then removed from the machine and stored. When needed, the now partially used paper roll is then fed back into the corrugated board machine at a later time. The data carrier is therefore preferably designed in such a way that it remains reliably attached to the paper roll even after repeated feeding and removal of the paper roll from the corrugated board machine. In a suitable embodiment, the data carrier is detachable and is removed when the paper roll is fed in and reattached to the paper roll when it is removed and subsequently stored.In another suitable embodiment, the data carrier is attached to the paper roll in such a way that it does not need to be removed and thus remains on the paper roll when it is processed in the corrugated board machine. Advantageously, the data carrier is attached to the center of the paper roll, particularly to or within a core. Contactless or electronically readable data carriers such as RFID and NFC tags are particularly suitable for this purpose. This ensures that the paper parameters are available throughout the entire service life of a paper roll, even after multiple uses. The explanations regarding the data carrier apply analogously to the aforementioned ID, which is described in more detail below.

[0042] Especially with paper rolls that are used multiple times, updating the paper parameters is advantageous. In a suitable configuration, one or more of the paper parameters of a paper roll are updated if the roll is only partially used and removed from the corrugating machine and temporarily stored for later reuse, particularly away from the corrugating machine, e.g., in a roll storage area. The update is either a modification of an existing paper parameter or the addition of a new one. For example, it is useful to update the paper length (i.e., store the remaining length of paper), the diameter of the paper roll, and, in general, all properties of the paper roll that change during processing in the corrugating machine. A suitable newly added paper parameter could be, for example, the unwind direction.The direction in which the paper roll was unwound during processing (especially for paper used to produce the fluting of the corrugated board web). A particularly advantageous design is one in which one or more operating parameters of the corrugating machine used during processing of the paper roll are saved when the paper parameters are updated, so that when the paper roll is used again, the operating parameters last used for that roll are immediately accessible and available. The operating parameters selected are, in effect, inherited. Alternatively or additionally, the update also saves which other paper rolls the paper roll was processed with and, optionally, which operating parameters were used. In this way, operating parameters are advantageously learned that are particularly beneficial in combination with such or similar paper rolls (e.g., from the same batch).The update is performed primarily using a writing device on the corrugated board machine. Optionally, the reading and writing devices are combined into a single reading and writing device.

[0043] Alternatively or additionally to the aforementioned offline solution, an online solution, such as a cloud solution, is also generally advantageous. Such an online solution has the particular advantage that the determination of paper parameters, e.g., by means of a laboratory analysis, can be carried out in parallel (i.e., simultaneously) with the transport of the paper roll, and the paper parameters are then transmitted online. In a suitable implementation, at least a subset (one or more), and in particular each, of the paper rolls has a unique ID (also referred to as an identifier or identification mark), which is stored together with the paper data of the respective paper roll in a database, e.g., a data lake. In a suitable implementation, the database is part of a cloud. Using the ID, a specific paper roll is assigned to its paper data, which is then determined and / or stored independently of the paper roll.The use of an ID to assign a paper roll to a data record within a set of multiple aggregated data records was outlined above. In a suitable configuration, the database is separate from the corrugated board machine and connected to it for data transmission, e.g., via the internet or another network. Alternatively, the database can be integrated into the corrugated board machine. The database is connected either to a single corrugated board machine or to multiple machines. The corrugated board machine requests the paper data for a specific paper roll from the database using its ID. Once the corrugated board machine has received the values, the operating parameters are adjusted accordingly.In principle, it is also possible that the relevant rule used in this process is stored in the database and that, when the corrugated board machine is requested for a given ID, the corresponding values ​​for the operating parameters are transmitted directly. Even with the online solution, the paper parameters are thus used directly to control the corrugated board machine; the ID merely represents a pointer to the database to request the corresponding data record, which is not directly attached to the paper roll itself. The ID, however, is advantageously attached to the paper roll; accordingly, the statements regarding the data carrier also apply analogously to the ID.

[0044] A bidirectional interface between the corrugating machine and a paper machine (or paper mill in general) is also advantageous. This bidirectional interface allows paper data to be transmitted to the corrugating machine for control purposes, as described. Conversely, corrugated board data is also transmitted to the paper machine for control purposes. In a suitable configuration, a fundamentally symmetrical setup is achieved, in which the corrugating board data, analogous to the paper data, contains corrugated board parameters and thus describes the properties of the corrugated board. The paper parameters mentioned in connection with the paper data are, in principle, also suitable as corrugated board parameters. Alternatively or additionally, corrugated board-specific parameters, such as warp or gluing quality, are advantageously used.The corrugated board data is then used to control the paper machine. The explanations regarding the control of the corrugated board plant also apply analogously to the control of the paper machine, although, in detail, the paper machine is consequently controlled with different operating parameters than a corrugated board plant. A particular advantage of the bidirectional interface is that defects and rejects in the corrugated board plant are correlated with paper data from the paper roll being processed there and reported back to the paper machine. The paper machine then makes a suitable correction (i.e., adjusts the operating parameters accordingly) to produce paper that does not, or at least does not, result in the aforementioned defects or rejects.In other words, the paper machine receives feedback regarding the suitability of the paper being produced, and depending on this feedback, the operating parameters of the paper machine are optimized with the aim of improving the subsequent production of corrugated board.

[0045] In a suitable embodiment, the corrugating machine has one or more sensors that measure the paper parameters of each paper roll, particularly during operation, while the roll is loaded into the machine and preferably before it is processed. This is also an online solution. According to this design, processing begins as soon as the paper is unwound from the machine's unwinder and includes one or more of the following steps: splicing, corrugation (with a corrugating roller), moistening, drying, printing, and gluing and / or bonding with another paper web. Essentially, all processing steps benefit from knowing the actual paper parameter values, but especially those after unwinding or splicing.Accordingly, it is sufficient if the sensors are arranged along the paper web downstream of the unwinder or splicer and upstream of any other processing units. Integrating the sensors into the unwinder or splicer is also advantageous, allowing the paper parameter values ​​to be measured immediately before, during, or after unwinding / splicing.

[0046] Alternatively or in addition to one or more actual sensors as described above, an advantageous embodiment of the corrugated board machine includes a virtual sensor, also known as a soft sensor. The virtual sensor does not actually perform any measurements within the corrugated board machine; instead, it receives paper data, specifically those paper parameters determined outside the corrugated board machine (e.g., during paper production). Optionally, one or more paper parameters determined by an actual sensor within the corrugated board machine, as described above, are also supplied to the virtual sensor. An embodiment in which the aforementioned paper production process parameters are supplied to the virtual sensor is particularly advantageous, as these cannot be measured within the corrugated board machine itself due to their inherent limitations.The virtual sensor then determines the operating parameters for the corrugated board plant, particularly from the supplied paper data, and thus implements the aforementioned big data approach and / or the previously described rule for assigning the values ​​of the operating parameters to the values ​​of the paper parameters.

[0047] A corrugated board production line according to the invention comprises a control unit configured to carry out a process as described above. The control unit is specifically configured to perform one or more of the described steps of the process. For this purpose, the control unit controls the processing units accordingly and thereby sets the operating parameters.

[0048] Ideally, the corrugated board plant has a job planning system. This system proactively plans the operating parameters. This process is further enhanced by the availability of individual paper parameter values ​​for each paper roll. Specifically, the job planning system queries the paper data for each roll, for example, using a reader or an ID. , and forwards this paper data to the control unit, which then adjusts the operating parameters and thus the individual processing units accordingly, especially as soon as the respective paper roll is processed.

[0049] A computer program product according to the invention comprises commands which, when executed by a corrugated board machine, particularly as described above, cause the machine to select and adjust the operating parameters, as described above, depending on the paper parameters, so that the production of the corrugated board web is individually adapted to the paper of the respective paper roll being fed in. In particular, the aforementioned rule for assigning the values ​​of the operating parameters to the values ​​of the paper parameters is also implemented in the computer program product. Suitablely, the computer program product also includes commands which, when executed by a corrugated board machine, implement the aforementioned order planning system for the machine.

[0050] A paper roll according to the invention is used in particular for the production of a corrugated board web and is characterized, as described above, by a number of paper parameters with individual values. The paper roll has a data carrier on which the individual values ​​of the paper parameters are stored. The data carrier is designed such that it can be read by a corrugated board machine in a process as described above, in particular to then control the corrugated board machine based on the values ​​of the paper parameters. Alternatively or additionally, the paper roll has an ID for referencing the values ​​of the paper parameters in a database. The ID is designed to serve as a pointer for requesting the values ​​of the paper parameters from the database by means of a corrugated board machine in a process as described above.

[0051] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Each drawing schematically shows: Fig. 1 a corrugated board plant, Fig. 2 a variant of the corrugated board plant made of Fig. 1 .

[0052] The Fig. 1 und 2 Figures 2 each illustrate a corrugated board production line 2 to explain exemplary embodiments of a method for operating such a corrugated board production line 2. The corrugated board production line 2 is used to produce a corrugated board web 4 and has a number of adjustable operating parameters 6 for this purpose. "A number of" here, and also more generally, means "one or more" or "at least one." Setting an operating parameter 6 is done by selecting and setting a value for that operating parameter 6. The behavior of one or more processing units 8 of the corrugated board production line 2 is controlled by means of the operating parameters 6. Examples of processing units 8 are unwinders 10, splicers, printers, single facers, bridges, preheaters, gluing units, double facers, drying sections, cutting units, slitting units, creasing units, and the like.

[0053] In this process, a number of paper rolls 12 are fed to the corrugating machine 2, each containing a paper web from which the corrugated board web 4 is produced. Each paper roll 12 consists of a wound paper web, which is unwound by the corrugating machine 2 using a unwinder 10 to produce the corrugated board web 4 and is suitably joined with further paper webs from other paper rolls 12. The processing units 8 then process the paper webs according to the operating parameters 6. The figures show a highly simplified representation of the path of the paper webs and the corrugated board web 4 through the corrugating machine 2.

[0054] The paper rolls 12 are each characterized by a number of paper parameters 14, which have individual values ​​for each of the paper rolls 12, so that each of the paper rolls 12 is individually characterized based on its values ​​for the paper parameters 14 (also referred to as paper data). The paper parameters 14 each describe, directly or indirectly, one or more properties of the paper of the paper roll 12, so that different values ​​mean or imply correspondingly different properties. As a rule, two paper rolls 12 differ in one or more of the paper parameters 14 due to their production, storage, transport, etc. This individuality of the paper rolls 12 is taken into account and used in their processing to optimize the production of the corrugated board web 4.For this purpose, the operating parameters 6 are set depending on the values ​​of the paper parameters 14, so that the production of the corrugated board web 4 is individually adapted to each paper roll 12. In this case, the individual paper data of a paper roll 12 are used to control the corrugated board machine 2, so that its operation then depends on the individual values ​​of the paper parameters 14 of a respective paper roll 12. The values ​​of the paper parameters 14 used for a single paper roll 12 are aggregated as far as possible, i.e., combined into a data set 16.

[0055] In the illustrated embodiments, values ​​for the operating parameters 6 are selected according to a rule 18, which links the values ​​of the paper parameters 14 with the values ​​for the operating parameters 6 in such a way that a quality measure for the corrugated board web 4 is maximized. The rule 18 is, for example, trained, i.e., it is generated beforehand in a learning process in which the relationship between the operating parameter 6 and the paper parameter 14 is determined, and the rule 18 is then determined directly from this data or indirectly via a function derived from it.

[0056] In this case, the operating parameters 6 are set not only indirectly, but directly depending on the values ​​of the paper parameters 14. For example, instruction 18 is a function that takes the paper parameters 14 as input parameters and the operating parameters 6 as output parameters. According to instruction 18, the corrugated board machine 2 converts the values ​​of the paper parameters 14 into suitable values ​​for the operating parameters 6, and these values ​​are then set. Preferably, no intermediate parameters are determined.

[0057] Which specific paper parameters 14 are used is initially of secondary importance and becomes less relevant as the number of paper parameters 14 increases. Accordingly, as many paper parameters 14 as possible are used here, e.g., at least 10 or even at least 100. However, some paper parameters 14 regularly have a greater influence on the quality of the corrugated board web 4 than others and are therefore used selectively in one possible configuration. For example, one or more of the paper parameters 14 are selected from the following: fiber orientation of the paper of the paper roll, failure stress of the paper of the paper roll 12.

[0058] In one possible embodiment, at least one of the paper parameters 14 is a dynamic paper parameter 14, the values ​​of which are specified as a function of the width and / or length of the paper web of the paper roll 12. In contrast, static paper parameters 14 have the same value along the entire paper web of the paper roll 12. Suitable dynamic paper parameters 14 are humidity and temperature as a function of the width and / or length of the paper web of the paper roll 12.

[0059] Alternatively or additionally, the paper parameters 14 comprise a number of papermaking process parameters that were used in the production 20 of the paper of the paper roll 12. The papermaking process parameters are operating parameters of a paper machine in a paper mill for the production 20 of the paper roll 12 or at least for the production of the paper for the paper roll 12.

[0060] In the embodiment shown here, some or all of the values ​​of the paper parameters 14 of a respective paper roll 12 were determined in advance, namely before this paper roll 12 is fed into the corrugated board machine 2. The values ​​of the paper parameters 14 are therefore known before the corrugated board machine 2 is fed with the paper roll 12 and therefore only need to be transmitted to the corrugated board machine 2 in order to set the operating parameters 6.

[0061] Furthermore, at least some of the values ​​of the paper parameters 14 of a given paper roll 12 were already determined during its production 20, especially in the case of the paper manufacturing process parameters mentioned above. Alternatively or additionally, the values ​​of the paper parameters 14 of a given paper roll 12 were determined after its production 20, for example, by means of a laboratory analysis 22. For example, the paper parameters 14 are determined and stored during or immediately after production 20, and possibly even by the manufacturer of the paper roll 12 itself.

[0062] In the illustrated embodiments, the corrugated board machine 2 has a data interface 24 through which the values ​​of the paper parameters 14 of a respective paper roll 12 are transmitted to the corrugated board machine 2. The values ​​are transmitted before, during, and / or after feeding the corrugated board machine 2, e.g., even before the paper roll 12 is unwound for processing.

[0063] In the exemplary embodiment of the Fig. 1 Each paper roll 12 is assigned a data carrier 26 on which the individual values ​​of the paper parameters 14 of the respective paper roll 12 are stored. Each data carrier 14 is assigned to exactly one paper roll 12 and contains only the values ​​for that single paper roll 12. To set the operating parameters 6 depending on the paper parameters 14, the data carrier 26 is read by the corrugated board machine 2. For this purpose, the corrugated board machine 2 has a suitable reading device 28. The data carrier 26 enables an offline solution in which the values ​​of the paper parameters 14 are transmitted to the corrugated board machine 2 without the machine needing to be connected to the internet or any other network to receive the data record 16 for a particular paper roll 12. The data carrier 26 can be sent with the paper roll 12 and is, in effect, a label or a kind of data sheet for the paper roll 12.In the configuration shown here, the data carrier 26 is attached to the paper roll 12.

[0064] An online solution is also generally advantageous as an alternative or in addition to an offline solution. An example of this is shown in Fig. 2 shown. There, each of the paper rolls 12 has an ID 30, which, together with the values ​​of the paper parameters 14 of the respective paper roll 12, is stored in a database 32. The ID 30 is attached to the paper roll in the same way as the data carrier 26 in Fig. 1 Database 32 is either as in Fig. 2 The corrugated board machine 2 is shown separately, or a part thereof (not shown). The corrugated board machine 2 requests the values ​​of the paper parameter 14 of a respective paper roll 12 from the database 32 based on its ID 30. As soon as the corrugated board machine 2 has received the values, the operating parameters 6 are set accordingly. It is also possible that the relevant regulation 18, if used, is stored in the database 32 and, when the corrugated board machine 2 requests a given ID 30, directly transmits the corresponding values ​​for the operating parameters 6. In the online solution, the paper parameter 14 is thus used directly to control the corrugated board machine 2; the ID 30 merely represents a virtual placeholder for the paper roll 12 and its paper data in order to request the corresponding data record 16.

[0065] In the exemplary embodiment of the Fig. 1 The corrugated board machine 2 has one or more sensors 34 by means of which some of the values ​​of the paper parameters 14 of a respective paper roll 12 are measured during operation. This paper roll 12 is already loaded into the corrugated board machine 2. This is also an online solution. Processing essentially begins with unwinding from the dispenser 10 and then includes all subsequent processing steps. In principle, all processing steps benefit from knowledge of the actual values ​​of the paper parameters 14, but especially any processing steps after unwinding or after splicing. Accordingly, it differs from in Fig. 1 This is sufficiently demonstrated when the sensors 34 are arranged along the paper web downstream of the unwinder 10 or the splicer and upstream of any other processing units 8. The solution with one or more sensors 34 is also applicable to the embodiment of Fig. 2 applicable.

[0066] Each corrugated board machine 2 also has a control unit 36, which is designed to carry out the described procedure. The control unit 36 ​​controls the processing units 8 accordingly and thus sets the operating parameters 6. Furthermore, the corrugated board machine 2 has in Fig. 2 It also features a job planning system 38, which allows for the proactive planning of the settings of the operating parameters 6. Job planning system 38 asks, for example, as in Fig. 2 The values ​​of the paper parameters 14 of a respective paper roll 12 are displayed using the ID 30 of the database 32 used and are passed to the control unit 36, which then sets the operating parameters 6 and thus the individual processing units 8 as soon as the respective paper roll 12 is processed. A job planning system 38 is also used in the design according to Fig. 1 possible.

[0067] The corrugated board machine 2 shown here also executes a computer program product for operation, with commands which cause the corrugated board machine 2 to select and set the operating parameters 6 as described in the procedure, depending on the values ​​of the paper parameters 14, so that the production of the corrugated board web 2 is individually adapted to the paper roll 12 fed in each case.

[0068] Individual aspects that are only described or shown in connection with one of the embodiments are, in principle, transferable to the other embodiments independently of the other concepts contained in the embodiment in question. Reference symbol list

[0069] 2 Corrugated board machine 4 Corrugated board web 6 Operating parameters 8 Processing unit 10 Dispenser 12 Paper roll 14 Paper parameters 16 Data record 18 Instruction 20 Production (of the paper roll) 22 Laboratory test 24 Data interface 26 Data carrier 28 Reader 30 ID 32 Database 34 Sensor 36 Control unit 38 Job planning system

Claims

1. Method for operating a corrugated board machine (2), - wherein the corrugated board machine (2) serves to produce a corrugated board web (4) and has a number of adjustable operating parameters (6) for this purpose, - wherein a number of paper rolls (12) are fed to the corrugated board machine (2), each containing a paper web of paper from which the corrugated board web (4) is produced, - wherein the paper rolls (12) are each characterized by a number of paper parameters (14) which have individual values ​​for each of the paper rolls (12), such that each of the paper rolls (12) is individually characterized on the basis of its values ​​for the paper parameters (14), wherein the operating parameters (6) are set depending on the values ​​of the paper parameters (14), so that the production of the corrugated board web (4) is individually adapted to the respective paper roll (12) fed in. characterized by the fact that- one of the paper parameters (14) is the moisture content of the paper of a respective paper roll (12), wherein two of the paper rolls (12) which are fed to the corrugating machine (2) for simultaneous processing are selected such that their moisture contents do not differ from each other by more than a maximum value.

2. Method according to claim 1, wherein values ​​for the operating parameters (6) are selected according to a rule (18) which links the values ​​of the paper parameters (14) with the values ​​for the operating parameters (6) in such a way that a quality measure for the corrugated board web (4) is influenced, in particular improved, in particular maximized.

3. Method according to claim 1 or 2, wherein one or more of the paper parameters (14) are selected from the following paper parameters (14): fiber orientation of the paper of the paper roll (12), failure stress of the paper of the paper roll (12).

4. Method according to any one of claims 1 to 3, wherein at least one of the paper parameters (14) is a dynamic paper parameter (14) whose values ​​are specified as a function of a width and / or length of the paper web of the paper roll (12).

5. Method according to any one of claims 1 to 4, wherein the paper parameters (14) comprise a number of paper manufacturing process parameters which were used in the manufacture (20) of the paper of a respective paper roll (12).

6. Method according to any one of claims 1 to 5, wherein the values ​​of the paper parameters (14) of the paper of a respective paper roll (12) were determined before this paper roll (12) is fed to the corrugated board machine (2).

7. Method according to any one of claims 1 to 6, wherein the corrugated board machine (2) has a data interface (24) via which the values ​​of the paper parameters (14) of the paper of a respective paper roll (12) are transmitted to the corrugated board machine (2).

8. Method according to one of claims 1 to 7, wherein each paper roll (12) is assigned a data carrier (26) on which the individual values ​​of the paper parameters (14) of the paper of the respective paper roll (12) are stored, wherein the data carrier (26) is in particular read by the corrugated board machine (2).

9. Method according to claim 8, wherein the data carrier (26) is attached to the paper roll (12).

10. Method according to any one of claims 1 to 9, wherein at least a subset, in particular each, of the paper rolls (12) ID (30) which, together with the values ​​of the paper parameters (14) of the paper of the respective paper roll (12), are stored in a database (32), wherein the corrugating machine (2) determines the values ​​of the paper parameters (14) of the paper of a respective paper roll (12) based on its ID (30) requests from the database (32).

11. Method according to any one of claims 1 to 10, wherein the corrugated board machine (2) has one or more sensors (34) by means of which the values ​​of the paper parameters (14) of the paper of a respective paper roll (12) are measured while it is received in the corrugated board machine (2).

12. Corrugated board machine (2) comprising a control unit (36) configured to carry out a method according to any one of claims 1 to 11.

13. Computer program product comprising commands which, when executed by a corrugated board machine (2), cause it to select and adjust the operating parameters (6) according to a method according to one of claims 1 to 11, depending on the values ​​of the paper parameters (14), so that the production of the corrugated board web (4) is individually adapted to the paper of the respective paper roll (12) supplied.

14. Paper roll (12), - which is characterized by a number of paper parameters (6) with individual values, - which has a data carrier (26) on which the individual values ​​of the paper parameters (14) are stored and which is designed such that it can be read by a corrugated board machine (2) in a method according to one of claims 1 to 11, and / or - which has an ID (30) for referencing the values ​​of the paper parameters (14) in a database (32), wherein the ID (30) is designed to request the values ​​of the paper parameters (14) from the database (32) using the ID (30) by means of a corrugated board machine (2) in a method according to one of claims 1 to 11.

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