EP1518805A2 - Method for determining material properties relevant for production and method for preadjustment - Google Patents

Abstract

The method for the determining of production-relevant material properties in a web fed printing press entails first establishing a defined basic state at fixed print positions, then carrying out a specific variation of one of the control components influencing the web tension in the web path, and then from the result of this change on a drive component and/or the web tension deriving information regarding the stretch characteristic of the dry printed material web. An independent claim is included for a method for the presetting of a material web tension in a printing process.

Description

The invention relates to methods for determining production-relevant Material properties of the substrates and / or lifts, especially during the start-up or during the operation of rotary printing machines and methods for presetting according to the preamble of claim 1 or 17.

The production of printed matter is influenced by a number of factors certainly. These come in part from the printing plant (eg machine configuration, Printing method and / or type of printing units), partly by operating personnel (eg Qualification, experience and / or care) and partly from the consumables (eg paper properties, blanket properties, color properties and / or Dampening water quantity or properties). The influence of the pressure plant is in essentially static and limited deterministic. The influence of the operating personnel makes itself especially in unfavorable operating conditions and strong Disturbing effects noticeable, because under ideal operating conditions, it is largely unproblematic to operate a modern printing system.

The strongest and at the same time widest scattered influence comes from the Consumables: For example, the properties of many change Printing inks with increasing temperature, paper from an outer layer of a paper roll is usually conditioned differently than paper from a core layer, the influence of moisture on the stress-strain characteristics is enormous.

These findings are not new. For example, years ago Pressure equipment equipped with web tension control systems, and in addition to the Measuring points for web tension measurement also devices for determining the Paper characteristic used. However, these devices generally do not work non-destructive or at least not "online" in the operation of the printing press integrated. In addition, processes have already dealt with it, the properties to determine the printing material in the system. However, common is the well-known Approaches that for the determination of a more or less elaborate Additional equipment must be integrated into the system and a provision during Production is not possible (eg, DE 28 40 630 A1, DE 39 42 111 C2).

Some applications or patents aim to reduce the e-module of railways or to determine band-shaped materials and / or to take into account (DE 10 61 529 B1, DE 21 29 323 A1, DE 31 23 587 C2). For substrates such as foil, sheet metal, fabric and the like, their expansion behavior is due to the influence of moisture only in one This may be interesting for paper, however, that changed in a negligible range can greatly change its expansion behavior under the influence of moisture, is the stationary determination of the modulus of elasticity before the start of production or at the beginning of the Process chain of interest, since the modulus of elasticity during the passage of the Printing machine changed by the application of color and water. Furthermore The change in the modulus of elasticity across the process line influences the production much stronger than the modulus of elasticity of the dry paper. It is therefore advantageous to have one Classification of different papers in classes after the moisture sensitivity and not (only) according to the properties of the dry paper.

Conversely, it may be disadvantageous to have information about the strain behavior only to be present at a certain humidity. Just that Moisture sensitivity, d. H. a measure of the change in the expansion behavior at change of the humidity, has a substantial influence on the transport of the Train through the printing press.

By the US 54 85 386 A a method known, wherein during production a Measuring sequence for determining the modulus of elasticity of the web is traversed to then the strain by a voltage change to a desired value to be able to correct. First, this is done a voltage measurement and the Determining an associated reference length (path motion length) based on a number of pressure-specific measuring impulses (printing cylinder or marks) per unit of time. Subsequently, an increase of a drive torque to a draw roller with subsequently re-measuring the resulting stress and new associated Orbital motion length. The voltage and track length change is the modulus of elasticity derivable and suitable for subsequent control to constant elongation.

The invention is based on the object under production conditions feasible method for determining production-relevant Material properties of the substrates and / or lifts and a method for To create default.

The object is achieved by the features of claim 1 and 17, respectively.

The achievable with the present invention consist in particular that it with This method is possible, the printing properties of the substrate as well as influences of used consumables and additives on the production to determine non-destructively.

For this process, there are no additional installations in the production plant, except if necessary. Sensors for determining the moisture content of the material web before and after Printing unit, required. In particular, no additional installations are necessary that the interfere with normal production process or conversions or special web guides require. The procedure can be in the start-up phase of the ordinary Integrated production process.

Although the method only indirectly suggests an absolute value Material properties, but the material behavior can under the given Constraints (eg influence of production parameters, blankets, color viscosity, Plant-specific influences, ...) can be predicted very reliably. The procedure determines the material properties under the same environmental influences (eg Temperature, humidity, ...) as in production. This is the result more realistic than when determined under laboratory conditions.

If the process is combined with automatic web tension control used, the controller can automatically by the determined material properties be parameterized and thus the control quality can be improved and the existing Limits of the control range of the web tension control be extended.

By determining the material properties, along with stored Experience is a much more accurate presetting of web tension, Register values, etc. possible. This reduces the time until the first "GOOD" Copy and thus the waste.

The specific material properties can be used to determine limit values that are not may be exceeded in order to prevent web breaks or other production disruptions avoid.

If dramatic within different paper rolls of the same manufacturer This can be documented and changes in the material properties revealed a shortcoming is displayed to the paper supplier.

Embodiments of the invention are illustrated in the drawings and are in Described in more detail below.

Fig. 1

eine schematische Darstellungen eines Bahnweges durch eine Rotationsdruckmaschine;

Fig. 2

ein Verfahrensschema zur Ermittlung von Materialeigenschaften;

Fig. 3

eine Prozesskette für ein erweitertes Verfahren zur Bildung absoluter Werte;

Fig. 4

beispielhafte Darstellung der vorgehaltenen Zusammenhänge.

Show it:

Fig. 1

a schematic representations of a web path through a rotary printing machine;

Fig. 2

a process scheme for determining material properties;

Fig. 3

a process chain for an extended process for the formation of absolute values;

Fig. 4

exemplary representation of the held relationships.

In web-processing and / or processing machines, eg. As printing machines, in particular Web-fed printing presses, for printing webs 08, in particular Printing material webs 08 such. B. paper webs 08, the transport behavior and / or a register-compatible editing of the web 08 in particular also from the elastic or Strain behavior of the web 08 influenced.

As explained by way of example on FIG. 1, the machine designed as a printing press has a material supply, for. B. roll changer 01, on, from which the band-shaped Material (web 08) is unrolled and a tension element 02, z. B. an infeed 02, through a processing stage 04, z. B. printing unit 04 or printing tower 04, via a another tension element 07, z. B. a draw roller 07, possibly through a superstructure 09 and possibly via a further tension element 12, z. B. a funnel inlet roller 12, a Further processing level such. B. a folding device 13 (for example, from a Former and / or a folder and / or a delivery) is promoted. The Tension elements 02, 07 and possibly 12 provide actuators 02; 07; 12 for influencing one Web tension S1; S2; S3, short voltage S1; S2; S3, dar. The web tension S1; S2 (S3) is at least before and after the processing stage 04 at a respective measuring point 03; 06 (11), in particular web tension measuring point 03 (before printing unit: vDE); 06 (after Pressure unit: nDE) measured by a suitable sensor. The sensors for Determination of the web tension S1; S2 (S3) can be used as a measuring roller, as a dancer roller, or but also as a performance measurement of a driven Zuwalze his.

In addition, a directed after the processing stage 04 on the web 08 Moisture sensor 14 may be provided.

Since when printing a printing substrate 08 at one point of the process liquid (at least in the form of color) is applied, the knowledge of a measure of the Humidity sensitivity of particular interest. This can be done by at least two measurements with different degrees of humidity take place. Preferably these two measurements (if only two) are far apart and in particular close to the moisture actually present during the process. These are then for example, in "dry", d. H. not specially moistened substrate 08 (at Ambient conditions such as 25 ° C and 50% relative humidity, the z. B.5 to 10% by mass of the paper) and by printing by color and / or Dampening solution caused moisture.

In a conventional manner, the printer z. B. - the effects of Moisture sensitivity or expansion behavior at start of the machine within limits to hold - with stationary equipment measurements on samples of the to be printed Perform this, for example, with respect to the expansion behavior and / or Classify moisture sensitivity (or judge by its experience), and then appropriate default settings for the web tension before printing Select. With known paper he could then without measurement back on this To fall back on knowledge. These measurements and classifications can now z. Very much Subjectively failing, neither are capable of automating the process, nor Consider reliably the relevant pressure conditions.

Although the method according to the invention also uses empirical values and known physical relationships, from observed criteria to the printing technology Properties of the printing material to be able to close. However, it is observed by Changes caused by specified interventions / process steps in the web path be concluded on the printing technology properties of the substrate. These Interventions are, however, directly in the printing press - z. B. one after the other in a fixed predetermined order - carried out, with the measurable changes in the Web run (eg web tension, moisture of the paper and / or drive torques the conveying elements) are detected. It is also not important that absolute physical quantities are determined, but only that the characteristics D; F for the relative characterization of the elongation behavior and / or the Moisture sensitivity are suitable - in extreme cases, for example distinguishable in "strong stretchable "/" little stretchy "or similar for the former and / or "moisture sensitive" / "moisture insensitive" for the second criterion (Figure 4).

The procedure for determining relevant parameters D; F directly at the in the Machine located track 08 now happens as follows:

At the beginning of the determination, actuators 02; 07; 12 in the web run in an advantageous variant set to neutral values (eg 35 daN / m setpoint specification for the infeed 02 between reelstand 01 and printing tower 04, eg ± 0.0% or a defined starting value .DELTA.V ₀ for overfeed .DELTA.V (drive offset .DELTA.V ₀ ) of the tension roller 07 after the printing tower 04, possibly a hopper inlet roller 12 and possibly a Falzzugwalze). It must also be ensured that pressure AB and color or water AB are at this point in time and that machine speed V is set to a predefined start value V ₀ not equal to zero.

Basically, the determination of the parameters D; F also starting at any stationary, but reproducible operating state as a starting point possible. In this case, for example, the drive offset ΔV _T assumed at this time is the starting point ΔV ₀ and the web stresses S1; S2 (S3) as starting values S ₀₁ if necessary S ₀₂ and if necessary S ₀₃ .

1. Retraction of a neutral ground state or a stationary state

A first step for determining the material properties is the creation of a reproducible ground state, in which the web tension S1 before the printing unit 04 a fixed value, z. B. start value S ₀ (eg 25-45 daN / m, in particular about 35 daN / m) occupies and the drive offset .DELTA.V of the tension elements 07 (12), z. B. tension roller 07 and hopper inlet roller (12) to ± 0 or at least a defined starting value .DELTA.V _{0 is} set. This happens at a fixed machine speed V ₀ .

It is out of this ground state (or the o.g. reproducible operating state) now possible by changing individual parameters statements about the printing properties of the substrate 08 to meet. Not all features, which are determined have a great importance for the printing process for which Determination of other properties (optional process steps) must Additional information can be provided by a higher-level system. subsequent Properties are determined in the main process and in optional process steps:

2. Detecting bearing damage and / or anomalies in the web run (optional step)

From the evaluation of the voltages S1; S2 (S3), in particular web tension S1; S2 (S3) and the drive torques of the tension elements 02, 07 (12) can be used to make statements about possible bearing damage or other anomalies in the web run. It can be assumed that as a rule the web tension S1; S2; S3, which is generated in the infeed 02, in the ground state of 1. (pressure AB and .DELTA.V ₀ ≈ 0) continues until the web tension measuring point 06, z. Eg measuring point 06 according to pressure unit (nDE). Minimal deviations can result from the web guide, the inertia of the guide rollers and from the friction, but these are in the range of 1-2 daN / m. If larger differences occur in the voltages S1; S2 (S3), this may indicate a web anomaly or bearing damage, increased friction or other disturbances in the drive, and more accurate indication of the printer.

Detecting anomalies does not bring benefits in the normal production run, in the case of an error, however, the cause can be limited very quickly, otherwise it would be such damage only over the effects such as high driving moments of the Tensile elements, unusual web tension behavior and possibly register deviations indexable.

3. Stretching of the dry substrate 08 from the change in voltage due to a change in length

To determine the elongation of the dry paper web 08, from the under 1. described basic state of the drive offset .DELTA.V of the tension roller 07 by a fixed value (eg drive offset ΔV from 0 to 0.1 to 0.5%, in particular approx. 0.2%) and thereby the effect on the web tension S2 in the measuring point 06 observed after printing unit (nDE) and / or recorded and an evaluation - z. B. in an evaluation routine of an evaluation unit 16, in particular evaluation routine 16 in a computing and / or storage unit - made accessible.

This change dS2 (ΔV) represents a measure of the strain characteristic which used directly as parameter D for the expansion behavior or to a corresponding parameter D can be further processed.

In principle, in further development, an absolute indication of the relationship between Voltage change and relative change in length possible, if length and Length change are known. A change in length of the paper web 08 correlates with the change of peripheral speed. This makes a statement about the strain ε relative to the current paper path. This relationship applies as long as you moves in the linear part of the stress-strain diagram of the paper and can also used as a characteristic D 'or used for the formation of characteristic D' become.

After the determination of the elongation z. B. again the ground state after 1. retracted.

In an alternative (partial) procedure, with the machine running and pressure ON (color and water, however, AB) the setpoint specification for the web tension S1 (corresponds to the Setpoint for the feed unit 02) increased by a predetermined value. About the Change of the web tension S2 at the measuring point 06 according to the pressure unit (nDE) and About the change in the drive torque of the tension roller 07 is a conclusion the elongation behavior of the dry paper web 08 possible.

For this determination according to the second alternative to 3., the knowledge of the Conveying behavior of the blankets used advantage. This may be the printer or the system from previous measurements using the same or the same Blankets be known or the results from the following optional Step 5. will be used for later evaluation and / or classification.

4. Determination of an absolute value for the modulus of elasticity (optional step)

If there is information about the absolute paper web width and the paper thickness, It is also possible to draw conclusions about the modulus of elasticity in the dry state.

For this purpose, the data for the voltage change, the Distance between the nip feed roller 02 and pull roller 07, the Length change (from the speed change) together with the o.g. Data for Thickness and width evaluated.

The data for the paper web 08 (width, thickness) can be from a parent Production control system, a planning system or a control system directly, z. B. in one Evaluation unit, be taken over or also determined by the operating personnel, read or read from the roller data and then evaluated become.

5. conveying behavior of the blankets (optional step)

The web transport and the resulting web tension S1; S2; S3 before and after Printing tower 04 may u. strong by the conveying behavior of the pressure point forming cylinders, in particular the elastic lifts (blankets, sleeves, Coating) of transfer cylinders). The knowledge of the Conveying behavior allows the selection of basic settings for voltages and / or Drives that already take these effects into account. For the same kind of paper are then possibly for different lifts also different basic settings advantageous.

From the basic state to 1. the print-on command for the first printing unit is issued given and the effect on the web tension S2 at the measuring point 06 after Pressure unit (nDE) observed. After that the successive printing units will be successively switched to and between each of the web tension S2 measured and saved. From this can be qualitative and possibly quantitative statements about the Conveying behavior of the used blankets meet. In a simplified procedure If necessary, several or even all pressure points located in the web path can be used at once be employed. Important frame condition is that in all printing works in the Web course same or at least similar blankets are used.

The conveying behavior of the elevators influences the web tension S1; S2, so at positive or negative promotional lifts now make a difference from the Web tension measuring points 03; 06, z. B. measuring points 03; 06, before printing unit (vDE) and after printing unit (nDE). Only in neutral elevators this effect does not occur or only insignificantly.

When the machine is running, the web tension readings and the Drive torque detected. Thereafter, the pressure is switched to ON. Behave the Blankets absolutely neutral, no at measuring points 06 after printing unit (nDE) To be observed web tension change. Behave the blankets promoting or restrained, the web tension S2 will drop or rise there.

The gained information about the promotion behavior (positive, neutral, negative) or possibly also by means of the magnitude of the voltage differences over more detailed quantitative information can now by the printer or a possibly superimposed web tension control system to be taken into account when setting basic values, etc.

6. Stretching the production-moist paper web 08

The machine is either in the state of pressure ON, if 5. has been carried out, as it was reached after 5, or it will be after 3. (1st variant) or 4. first employed in the railway path and provided for printing printing units employed. Then the dampening solution is switched on ("water ON"). By "water ON" run the blanket and plate cylinder free and the substrate 08 comes into contact with the fountain solution. The applied water makes a change in the Elongation properties of the substrate 08 and thus a change in voltage S2 after the printing tower 04. The size of the change can be related to the Number of pressure points used to classify the paper in relation to its Moisture sensitivity can be used. From the printer, an evaluation unit 16 and / or a system for web tension control 18, the determined values for the changes as such (tensions) or as abstract characteristics F for Classification of the substrate 08 used with respect to its moisture sensitivity become. In both cases, the resulting sizes are meaningful results Identification of the moisture sensitivity of the printing substrate 08 (with the present Thickness and width). Although there is no absolute, normalized characteristic at this point ascertainable, however, the (relative) information important for the printing process lies for the actual production, web guiding and the present conditions.

With the machine running with pressure ON and predetermined web tension S1 am Infeed 02 is thus switched on color and water. About the change of Web tension S1; S2 and the drive torque of the tension roller 02 is the Expansion behavior of the printing substrate 08 determined in the wet state.

For this determination is the knowledge of the conveying behavior of the used blankets advantageous. This may be due to the printer or system taking previous measurements Use of the same or the same blankets be known or the Results from step 5 optionally mentioned above are used for evaluation and / or used for classification.

It is ideal if, in addition to sensors, the humidity of the dry and wet paper web 08 (see step 7.).

7. Absolute characterization of moisture sensitivity (optional step)

In a further development is on the railway - especially directly after the last Pressure point - a humidity sensor 14 arranged by means of which in addition to step 6. the absolute humidity of the paper is measured.

Although this method does not allow for the absolute expansion behavior at 5%, 10% and 15% etc. determine moisture, but you get a value for the actual production conditions is valid. Through this measurement can be together with 6. a classification of the printing material 08, based on absolute humidity, respectively.

In a development of the method step 6th or 7th is not on all printing units at the same time color and water are switched on, but it becomes printing unit for printing unit switched to. This one can approximate the moisture behavior of the Stock 08 at approx. 25%, 50%, 75% and 100% of the production moisture here Determine 4-color production.

The aforementioned sub-methods 1, 3 and 6 together form a particularly simple and advantageous method for classifying the printing material used 08. Die Sub-methods 2, 4, 5 and / or 7 form advantageous developments of Overall process and contribute to further improvement and comfort Operating the machine at. The optionality of going through these substeps is in Fig. 2 indicated by dashed lines. Step 2. can before or after step 3. be traversed and is therefore shown at the same height. Step 7. can after the Step 6, and step 4, at least after step 3. The printer and / or a higher-level control system may be based on the so obtained Characteristics or the particular class of the printing material 08 on the basis of his Experience or stored rules (tables and / or functional relationships etc.) make meaningful (pre) settings and thus the startup process and / or the Improve print quality.

Since it is possible and provided in a development, the determination steps to trigger sequentially by a controller and the measured values automatically capture, the individual measuring steps can follow each other relatively quickly. It can be advantageous, the sequence of measuring steps in the normal startup behavior of To integrate printing system with. Another variation is to let the printer start the Machine to decide whether he with or without the said procedure for Determination of material properties wants to start.

The evaluation of the measured values can be done by fuzzy logic as well as by discrete ones Logic, where the measured changes in the various Measuring steps can be considered relative to each other but also with Experience values are compared and by linking the evaluations of several Measuring steps Statements about the properties of the used printing material 08 under allow the current production conditions. For further evaluation The current machine configuration can also be taken into account.

Even during production it is possible to check the material properties For example, if the behavior of a paper web 08 after a roll change changed in an abnormal way (apart from the known web tension jump at the bond), without one of the actuators 02; 07; 12 was influenced in the web run. Here one can say something about the changed course behavior Material properties of the new roll over the material properties of the old Role meet (eg expands less or / and is more sensitive to moisture etc.). at However, current production can only provide a relative assessment of the readings of the original railway 08 take place. If absolute statements are to be made, the Production interrupted and go through the entire or the selected measurement cycle become.

When coupled to an automatic web tension control system 18 both at o. g. Starting operations as well as the mentioned interruption automatic correction of actuators 02; 07; 12 in the web run advantageous to again to maintain stable production conditions.

About the statements on the material properties can be specified for the Presetting the web tension and other production parameters. To that System to optimize even during operation, it is in a further training Printers are able to change the specifications developed by the system. The then, out View of the printer, optimal machine setting is in an advantageous embodiment of this Retainable, so they ready for later productions for evaluation stands. This allows the system to learn from the experience of the printer.

The parameters or numbers or classifications obtained by the method can in a simplest design as pure, from the measuring devices issued / displayed (the web tension and / or electrical power representing) sizes to the printer in classifying the used Substrate serve the printer already as (pre) evaluated key figures or already given as a determined class by an evaluation unit to the hand or else the sizes, measures or classes may be in addition to this or instead which is fed to a web tension control system, which this Information in his rule process - for example, by determining Preset values, of maximum and / or minimum permissible values, determination of Controller parameters and / or the definition of permitted slopes in dynamic Control behavior - integrated.

In the following, a processing of the determined according to 3. measure D; D 'by one Evaluation unit 16 and possibly a manual or automatic web tension control 18, which as a simplified variant in principle without the involvement of under 6 explained moisture inflow possible, but advantageous as described below taking into account the moisture sensitivity of particular advantage is:

A correlation can advantageously be stored in the evaluation unit 16 (for example, divided into discrete classes or value ranges of a table or functions defined in sections), in which the determined parameter D; D 'is assigned for the elongation behavior of a certain paper property (exemplified in Fig. 4a)). In FIG. 4, only two discrete value ranges [d ₁ .. X [and [x... [Or [f ₁ ... Y [and [y ... [for classification are provided by way of example; However, this is arbitrary - possibly even up to the continuous functional context - refinable. Furthermore, in an advantageous embodiment, each class of defined paper property has at least one proposed preset value (desired value _x ) for the voltage S1 and / or S3 and / or a difference ΔS to be maintained between S3 and S1 (similar to FIG. 4c), but possibly without Dependence on F). In a modification, a functional relationship between parameter D can also directly (without class formation); D 'and preset value should be provided _x .

In manual execution of the further procedure, this preset value setpoint _x for the web tension S1 ₀ ; S3 ₀ or difference .DELTA.S be perceived by the printer and manually, for example, at the control station, are specified as a setpoint. However, the preset value Soll _x can also directly to the control loop of the relevant actuator 02; (07); 12 are transmitted as setpoint specification. In the presence of a system for automatic web tension control 18, the corresponding preset value is setpoint _x for the voltage S1; S2; S3 or difference .DELTA.S now transferred as a setpoint specification in the web tension control 18.

The evaluation unit 16 can be shown as an independent component as shown in Fig. 1, or but as an independent process or sub-process in a machine control 17 or a control station or control computer 17 or, in the presence of a Web tension control 18, also as an additional subprocess of this Web tension control 18 may be formed (dashed). In the case shown is between the control computer 17 and the evaluation unit 16 (as a process or structurally Separately) provided an interface over which the measured values (voltages and / or overfeed and / or moisture, etc.) and possibly other information (Production method and / or printing material and / or blanket and / or color, etc.) of Evaluation routine of the evaluation unit 16 are provided. Also is between Evaluation unit 16 (as a process or structurally separate) and web tension control 18 an interface provided via which the setpoint specifications for the web tension S1; S2; S3, and if necessary, measured values for the voltages from the central computer 17 be passed through here. In automatic web tension control 18 acts their Output to the actuators 02; 07; 12, in particular 02 and 12.

The interface or the procedural and / or structural training of the Evaluation unit 16 can also be described for one or more of the others Be applied sub-procedure.

Advantageously, in order to determine suitable presetting values, in addition to Parameter D; D 'from 3. the determined according to 6. characteristic F for the moisture sensitivity used.

Here, in addition to the relationships between the characteristic D and the paper property and / or the appropriate default value and relationships between the characteristic F and the paper property and a relationship of appropriate setpoint Soll ₁ .... Soll ₄ etc. and a combination of the parameters D; D '; F provided. With knowledge of the stretching behavior D; D 'and the humidity sensitivity F can now be the suitable setpoint or suitable setpoint values for the voltage S1; S3 (possibly S2) or the difference .DELTA.S are determined and further processed (by way of example in FIG. 4c)). This is done as above for D; D 'described for example by perception and manual specification by the printer or as a control command (setpoint specification) to the control loop of the respective actuators 02; 07; 12 (the relevant actuator) or advantageous in the automatic system by transfer to the web tension control 18th

The as characteristic D; D 'or F designated sizes can also be representative of other, the strain behavior or moisture sensitivity characterizing Information D; D 'and F are understood.

LIST OF REFERENCE NUMBERS

01

reelstands

02

Tension elements, infeed mechanism, actuator

03

Measuring point, web tension measuring station before printing unit (vDE)

04

Printing unit, printing tower, processing stage

05

-

06

Measuring point, web tension measuring point according to printing unit (nDE)

07

Tension elements, draw roller, actuator

08

Substrate, substrate web, paper web

09

Superstructure, reversible deck

10

-

11

Web tension measuring point before hopper inlet (vTE), measuring point

12

Tension elements, funnel inlet roller, actuator

13

folding device

14

humidity sensor

15

-

16

Evaluation unit, evaluation routine

17

Machine control, control station, control computer

18

Tension control

D

Parameter, measure or information for expansion behavior

F

Parameter, measure or information for moisture sensitivity

S1

Voltage, web tension

S2

Voltage, web tension

S3

Voltage, web tension

Should _i

Setpoint, default value (here: i = x or 1 to 4)

[d ₁ ... x [, [x ...]

Range of values for classification, expansion behavior

[f ₁ ... y [, [y ...]

Value ranges for classification, moisture sensitivity

Claims (26)

Method for determining production-relevant material properties in a web press, characterized in that first with parked pressure points a defined ground state is produced, Subsequently, a targeted variation of one of the web tension (S1, S2, S3) influencing the web running actuator (02, 07, 12) is made, and from the effect of this change on a drive power and / or the web tension (S1; S2; S3) information (D) on the elongation characteristic of the dry printing material web (08) is derived. A method according to claim 1, characterized in that the ground state is established by a defined, nonzero machine speed V ₀ , before the first pressure point a predefined web tension S1 ₀ , and the tension element (07) behind the last pressure point a defined drive offset .DELTA.V ₀ for the conveying speed, in particular a drive offset ΔV ₀ of about 0%, is set. A method according to claim 1, characterized in that at parked pressure points of the drive offset .DELTA.V a tension element (07) changed by a defined value observing and / or recording the effect on the web tension (S1; S2) before or after the printing unit (nDE), and from this the information (D) on the expansion characteristics of the dry printing material web (08) is derived. A method according to claim 1, characterized in that at parked pressure points a setpoint specification for the predefined web tension (S1) changed by a fixed predetermined value while the effect on the drive torque of the tension element (07) is observed behind the last pressure point and / or recorded,
and from this the information (D) on the expansion characteristics of the dry printing material web (08) is derived. A method according to claim 1, characterized in that at parked pressure points of the drive offset .DELTA.V of the tension element (07) changed by a fixed predetermined value observing and / or recording the effect on a deflection of a pendulum roller in the retraction mechanism (02), and from this the information (D) on the expansion characteristics of the dry printing material web (08) is derived. A method according to claim 1, characterized in that after observing and / or recording the effect on the dry printing material web (08) employed at least one of the pressure points and the dampening solution and / or ink supply of this pressure point is activated, and that a change in the web tension (S2) observed after the printing tower (04) due to the activation of fountain solution and / or ink supply and / or recorded. A method according to claim 6, characterized in that from the change of the web tension (S2) information (F) for moisture sensitivity of the moist printing material web (08) is derived. A method according to claim 6, characterized in that the size of the change in connection with the number of pressure points used for the classification of the printing material (08) is used in terms of its moisture sensitivity. A method according to claim 6, characterized in that used to determine the change, the difference between the web tension (S2) with inking position applied without activating the fountain solution and / or ink supply and the web tension (S2) with staff pressure point with activation of dampening solution and / or ink supply becomes. A method according to claim 6, characterized in that for determining the change, the difference between the web tension (S2) without an inking pressure point and without activation of dampening solution and / or ink supply and the web tension (S2) with staff pressure point with activation of dampening solution and / or ink supply is used. A method according to claim 7 or 8, characterized in that in the derivation or classification information on the conveying behavior of the Badruckstoffbahn (08) located in pressure ON position elevators is taken into account. A method according to claim 1, characterized in that an evaluation of the web tension (S1; S2; S3) and / or the drive torque of the tension elements (02; 07; 12) takes place in the ground state and from this statements about any bearing damage or other anomalies in the web run are made , A method according to claim 1, characterized in that from the information on the elongation characteristic and data on the thickness and width of the printing substrate (08) of the modulus of elasticity in the dry state is determined. A method according to claim 1, characterized in that when the machine is running in the ground state, the web tension (S1; S2) are detected in front of and behind at least one of the pressure points, then switched to pressure, and from re-measurement in pressure ON position on the Conveying behavior of a in printing ON position in contact with the printing material (08) located elevator of a printing cylinder is closed. A method according to claim 7, characterized in that from the information (D; F) to the elongation and / or moisture sensitivity of the wet printing substrate (08) and measured after the pressure point absolute value for the moisture content of the printing substrate (08) an absolute characterization of the moisture sensitivity is made. Method according to one or more of Claims 1 to 15, characterized in that the steps of the method are executed as part of a higher-level process for the starting process for presetting the web tension (S1; S2; S3). Method for presetting a web tension (S1, S2, S3), wherein first in a measuring cycle on the drawn web (08) without moistening agent and without paint application by selective variation of the web tension (S1; S2; S3) in the web-influencing actuator (02; 07; 12) and measuring the web tension (S1; S2; S3) an information (D) on the expansion characteristics of the dry printing material web (08) is derived, using this information (D) from a reserved relationship between the information (D) and suitable web tension (S1; S2; S3) a preset value (target _x ; target ₁ ; command ₂ ; command _3; command ₄ ) for the web tension (S1 S2; S3) is determined, which is finally used before production start to preset the web tension (S1, S2, S3) by one or more of the actuators (02, 07, 12). A method according to claim 16, characterized in that after the first-mentioned measuring cycle at least one of the pressure points employed and the dampening solution and / or ink supply of this pressure point is activated, and that based on a change in the web tension (S1, S2, S3) information (D ) to the moisture sensitivity (F) of the printing material web (08) is derived. Method according to claim 16 and 17, characterized in that the determination of the preset value (setpoint _x ; setpoint ₁ ; setpoint ₂ ; setpoint _3; setpoint ₄ ) for the web tension (S1; S2; S3) is made using both the information (D) and the information Stretching behavior is also obtained from the information (F) for moisture sensitivity. A method according to claim 16, characterized in that the information (D) for the elongation characteristic of the dry printing material web (08) according to the method for determining production-relevant material properties according to one or more of claims 1 to 15 takes place. A method according to claim 16, characterized in that the preset value (target _x; target _1, target _2, target _3, target ₄₎ as a target value (target _x; target _1, target _2, target _3, target ₄₎ for automatic to a system Web tension control (18) is transferred. Method according to claim 1 or 16, characterized in that the measured values for the present web tension (S1; S2; S3) are provided via an interface by a machine controller (17). A method according to claim 1 or 16, characterized in that the derivation of the information (D) to the elongation characteristic in an EDP-based evaluation routine takes place. A method according to claim 7 or 18, characterized in that the derivation of the information (F) for moisture sensitivity in an EDP-based evaluation routine takes place. Method according to Claim 16, characterized in that the determination of the preset value (setpoint _x ; setpoint ₁ ; setpoint ₂ ; setpoint _3; setpoint ₄ ) for the web tension (S1; S2; S3) takes place in an EDP-supported evaluation routine. Method according to Claim 17, characterized in that a storage means is provided in which a preset value (setpoint _x ; setpoint ₁ ; setpoint ₂ ; setpoint _3; setpoint ₄ ) determined for a specific production and / or specific printing material web (08) is stored and maintained becomes.

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