Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
  • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
  • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
  • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
  • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
  • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
  • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
  • B41J11/0022—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air
  • B41J11/00222—Controlling the convection means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
  • B41J15/16—Means for tensioning or winding the web
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
  • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J2203/00—Embodiments of or processes related to the control of the printing process
  • B41J2203/01—Inspecting a printed medium or a medium to be printed using a sensing device
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
  • B41M5/0017—Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying

Definitions

• the invention relates to a method for printing a decoration on the surface of a workpiece using a digital printing system, the printing system having at least one application unit for applying a liquid to the workpiece and at least one dryer unit for drying the workpiece.
• the invention also relates to a digital printing system for carrying out such a method.
• Digital printing systems with applicator unit and dryer unit have been known from the prior art for a long time. They are used for printing very different workpieces. From the WO 2020/078606 A1 a corresponding system is known, for example, which is used to print the surface of a non-absorbent substrate. First of all, the surface tension of the substrate surface has to be changed in such a way that it can be wetted at all by a water-based ink, for example. After the ink has been applied, the dryer unit is used to heat up the applied liquid layer, i.e. the decoration, within 1 second and thus ensure rapid evaporation of the solvents contained in the liquid. This fixes the applied ink and improves the print image.
• the applied liquid layer i.e. the decoration
• the EP 2 927 003 B1 describes a method in which the surface temperature of the workpiece is changed by means of the dryer unit.
• the method described there is based on the finding that solvents contained in the applied ink evaporate faster on a warm surface of the workpiece and the viscosity of the ink therefore increases rapidly, as a result Dots of color, as they are applied in digital printing, can hardly and possibly too little spread.
• the solvents evaporate only slowly and the viscosity of the ink remains low for a long time, so that the colored dots can spread easily and possibly too much.
• the temperature of the surface of the workpiece to be printed can be adjusted and brought to the desired value.
• Drying by means of at least one dryer unit is also of great importance when printing, for example, a paper web using a digital printing system. If the workpiece is wetted with a liquid in an application unit, for example printed, the moisture content of the printed surface has a major influence on whether and, if so, how far the applied liquid penetrates the surface or is distributed over it. The evaporation and outgassing of solvents also depends heavily on the humidity of the printed or wetted surface.
• the humidity itself also depends on a large number of parameters.
• This relates, for example, to the moisture content of the workpiece to be printed, for example the paper moisture content of the base paper.
• This is influenced by hygroscopicity during storage, for example the temperature and humidity of the room in which the base paper is stored.
• the quantities applied for example of a primer, a possibly multi-colored decoration or sealing layers, can also influence the moisture content of the workpiece and its upper side and surface.
• a paper web to be printed is usually guided over several guide rollers in the digital printing system, which on the one hand convey the paper web to be printed through the printing system and on the other hand ensure that the paper web rests as smoothly as possible.
• a primer is a layer on which the colored print dots forming the respective decor are applied. This layer can also be called the primer.
• the layer does not have a basic color, for example white, in order to compensate for irregularities in color on the surface of the workpiece to be printed and to ensure reproducible and predictable basic conditions for printing the decoration.
• the layer is designed as an ink-receptive layer and does not change or not only the optical appearance of the surface, for example its color, but rather the ability to absorb the color.
• the disadvantage is that experienced operating personnel are required whose experience can be used and the methods cannot be carried out in a reproducible and predictable manner.
• the invention is therefore based on the object of eliminating or at least alleviating the disadvantages of the prior art.
• the method according to the invention makes it possible to carry out the method in an automated and reproducible manner and thus to print the surface of a workpiece.
• a large number of workpieces can also be produced identically or at least almost identically and with as little scrap as possible.
• the electrical control which is an electronic data processing device, for example.
• the electrical control determines drying parameters that contain or are in particular control parameters for the dryer unit. These drying parameters contain, for example, the dryer output, a dryer temperature, a transport speed at which the workpiece to be dried is moved through the dryer unit, and/or the type of dryer.
• the last parameter is particularly advantageous when the dryer unit has different dryers that can be used as needed.
• the dryer unit is operated with the drying parameters determined in this way in order to dry the respective workpiece.
• the device that is used to carry out such a method has at least one moisture sensor that is set up to measure the moisture on the surface of the workpiece.
• the at least one sensor is also set up to transmit the measured values that it determines to the electronic data processing device or to another type of electrical control.
• the Measured values allow conclusions to be drawn about the actual moisture content of the surface of the workpiece to be dried and are provided as information about the expected moisture content in the electrical control.
• the moisture is preferably determined as close as possible in front of the dryer unit, so that the measured values describe the moisture that the workpiece has when it enters the dryer unit as accurately as possible.
• the transport speed at which the workpiece is transported to the drying unit and the distance between the point at which the measurement is carried out and the start of drying must be coordinated in such a way that the electrical control, in particular the electronic data processing device, has sufficient time to determine the drying parameters before the workpiece to be dried is fed into the dryer.
• This distance depends on the one hand on the transport speed and on the other hand on the measurement data and the speed of the data processing device.
• the moisture is preferably determined by means of an infrared (IR), near-infrared (NIR) or microwave measuring method and/or an L value determination.
• IR infrared
• NIR near-infrared
• microwave measuring method microwave measuring method and/or an L value determination.
• the combination of different methods is also possible and may be advantageous.
• the choice of the actual method depends in particular on what information is required in order to be able to determine the drying parameters as optimally as possible. It can be advantageous to determine the moisture only in the narrowest possible area on the surface, for example down to a depth of 1 mm. In other methods, it is advantageous to also determine the moisture in deeper layers, for example down to a depth of 3 mm or 5 mm, and not just on the surface of the workpiece.
• the moisture is preferably determined down to a depth of a few hundredths of a millimeter to a few tenths of a millimeter, for example from 0.01 mm to 0.5 mm.
• the expected humidity is calculated. This is preferably done on the basis of information about at least one amount of liquid applied to the workpiece before drying, at least one temperature, preferably a temperature profile over time, in particular the Workpiece, the room and / or the applied liquid and / or moisture in the workpiece. If at least an amount of liquid was applied to the workpiece before drying, this obviously has a major influence on the moisture, especially on the top and surface of the workpiece.
• the liquid that is applied can be, for example, a primer, an undercoat, ink or a protective layer.
• the temperature of the workpiece, the room and/or the liquid applied has an influence on how much moisture, for example, the workpiece can absorb and/or how much moisture penetrates into the workpiece.
• the information provided about the expected moisture and the determined drying parameters are each a function of the position on the surface of the workpiece.
• both the expected humidity and the drying parameter are given as a function of location.
• This is particularly advantageous when, for example, the expected moisture is distributed inhomogeneously over the surface of the workpiece. This can happen, for example, when printing ink is applied with different strengths, since, for example, some areas of the surface of the workpiece are printed more heavily and therefore with more ink than other areas.
• the use of different inks, for example for different colors, can also lead to different amounts of moisture being applied to the surface of the workpiece and/or penetrating into the upper side of the workpiece.
• An inhomogeneous amount of moisture can also result from the fact that the primer is applied to different degrees at different points on the upper side of the workpiece. This is the case, for example, if color fluctuations, for example cloudiness of the workpiece to be printed, for example a paper web, are to be compensated for by the primer, which was previously recorded and evaluated, for example by means of a camera. In this case, it makes sense to apply more primer to darker areas on the upper side of the workpiece to be printed than to lighter areas. This not only applies different amounts of primer, but also different levels of moisture.
• the at least one dryer unit is advantageously set up to dry different areas of the surface of the workpiece to different extents. In this way it is possible to react to different amounts of moisture in the respective areas of the surface of the workpiece and to produce homogeneous moisture.
• the dryer unit can have, for example, a plurality of dryer modules, for example 3, 5 or 7 dryer modules, which are arranged in such a way that they dry different areas of the workpiece. For example, they can be arranged next to one another in a direction perpendicular to the transport direction of the workpiece through the printing system.
• this arrangement not only allows inhomogeneous moisture distributions, which can prevail on the surface of the workpiece in front of the dryer unit, to be converted into homogeneous moisture.
• the targeted generation of inhomogeneous moisture on the surface of the workpiece is also possible and can be advantageous.
• the moisture on the surface of the workpiece influences how, for example, an ink or another applied liquid behaves on the surface. This can also be desired differently at different points, so that inhomogeneous moisture is an advantage.
• target moisture distribution is preferably stored in an electronic data memory which the electrical control, in particular the electronic data processing device, of the printing system can access.
• This setpoint moisture is preferably taken into account when determining the dryer parameters.
• the workpiece is dried several times, which is advantageously done in different drying units.
• the method steps a. and b. carried out i.e. information about the expected humidity is provided and drying parameters for the dryer unit are determined. These are transmitted to the dryer unit so that the dryer unit can be operated with them.
• the workpiece is particularly preferably dried before and/or after the application of at least one liquid to the workpiece.
• liquids are applied to the surface of the workpiece several times. This is preferably done in several commissioned works, for example rollers, print heads or others Order means can be.
• the moisture applied in each case, possibly depending on the position on the surface of the workpiece, is stored in an electronic data memory and the electrical control is provided.
• a primer can first be applied to the surface before, for example, different colored ink is applied in multiple printing passes by multiple print heads that represent the applied works.
• the workpiece and in particular its surface are preferably dried.
• the workpiece advantageously runs through a drying unit after each application.
• a dryer unit is also particularly preferably passed through before the first application of a liquid and after the last application of a liquid.
• the printing system therefore preferably has a plurality of application units, by means of which at least one liquid is applied to the workpiece, with the workpiece being dried before and/or after at least one liquid is applied.
• the moisture on the surface of the workpiece is measured using at least one moisture sensor and compared to a predetermined target value, with a measure of the deviation of the measured moisture from the predetermined target value being included in the future determination of the drying parameters. It is therefore advantageous not only to determine the moisture on the surface of the workpiece before the actual drying in order to determine drying parameters, but also to measure the moisture again or for the first time after the actual drying. On the one hand, this can be used to check whether the target moisture content has been reached, i.e. whether the determined drying parameters are achieving the desired goal. If this is the case, there is no need to change the routines and settings in the electrical control system that determines the drying parameters. However, if the deviation is greater than a predetermined limit value, the calculations used to determine the drying parameters are adjusted and modified in the electrical control.
• drying parameters can relate both to drying parameters of dryer units used later, which are used when printing the same surface of the workpiece. However, the future determination can also relate to drying parameters that are used when printing surfaces of other workpieces.
• the workpiece is preferably a paper web and a degree of wrinkling of this paper web is recorded in the printing system. This is preferably done by means of a 2D and/or 3D profile measurement, which is particularly preferably carried out using a laser scanner.
• the recorded degree of wrinkling is compared to a predetermined target value. If the deviation between the recorded dimension and this target value is greater than a predetermined limit value, the tension that is exerted on the workpiece in the printing system is changed. Depending on the deviation, the voltage is increased or decreased.
• the invention also solves the problem set by a digital printing system for carrying out one of the methods described here, which has at least one application unit for applying a liquid to the workpiece and at least one dryer unit for drying the workpiece and an electrical control, in particular an electronic data processing device. which is set up to carry out one of the methods described here.
• the working width of a digital printing system is preferably at least 1300 mm, preferably at least 1600 mm, particularly preferably at least 2000 mm and at most 2300 mm, preferably at most 2200 mm and particularly preferably at most 2100 mm.
• the speed of the system at which the surface to be printed is moved through the system is preferably at least 80 m/min, preferably at least 100 m/min and particularly preferably at least 130 m/min and at most 270 m/min. preferably at most 200 m/min and particularly preferably at most 140 m/min.
• the speed is preferably at least 60 m/min, preferably at least 70 m/min and particularly preferably at least 80 m/min and at most 110 m/min, preferably at most 100 m/min and particularly preferably at most 90 m/min .
• the amount applied is preferably at least 1 g/m 2 , preferably at least 2 g/m 2 and particularly preferably at least 3 g/m 2 and at most 10 g/m 2 , preferably at most 6 g /m 2 , particularly preferably at most 4 g/m 2 .
• the moisture of the surface to be printed is an important aspect when it comes to achieving the best possible print image that is true to the original and keeping the amount of waste produced as small as possible.
• Other aspects concern, for example, the printing parameters and thus the digital template.
• the comparison of the printed decor with the decor to be printed is carried out in the method according to the invention using the various measurement data.
• the pressure measurement data is compared with the reference measurement data.
• the reference measurement data consequently correspond to the data that were or would be measured on a decor that can serve as a reference, ie corresponds exactly to the desired decor.
• the finding on which the invention is based is therefore that it is not necessary to compare entire images with one another in order to determine the quality of the printed decoration if measurement data can be defined, the comparison of which for the printed decoration and the decoration to be printed enables the comparison of the Images or the entire decors superfluous.
• the measurement data are spatially resolved, so that fluctuations in the print quality, which can arise in particular from the parameters listed above, can also be determined, even if they occur on a spatially small scale, for example within a single printed decoration.
• the measurement data is hyperspectral, so that information beyond the visible light is also included and can be compared.
• the digital template preferably corresponds to the control parameters with which the printing system is controlled. This applies in particular to control commands about what amount of ink should be applied to which point on the print surface.
• the control parameters preferably contain all the information required to operate a printing unit of the printing system.
• a time interval between two consecutive executions of step B. is independent of whether the digital template has been changed.
• the production, in particular the cycle with which the decor is printed on the print surfaces, is therefore not changed, so that the digital template can be corrected or changed inline, i.e. without interrupting or delaying the production process.
• the digital template of a decoration to be printed is made available to the printing system in a manner known per se from the prior art.
• the printing system is controlled by this digital template to print the decor to be printed on the reference surface.
• the reference surface preferably corresponds in material, size, feel and/or color to the print surfaces to be printed in the course of the method.
• the decor printed on the reference surface is then measured by measuring the metrics. In this way, reference measurement data are obtained.
• a conversion tool can be used to perform a conversion so that the various measurement data correspond better to each other. In principle, however, this is subject to errors and it is therefore advantageous if the respective surfaces match as well as possible.
• a major advantage of this method is that the reference measurement data on which the comparison is based in step D. is actual Measurement data that cannot be taken from a digitally available template stored in an electronic data storage device.
• This solves the widespread problem of color fastness, since the method allows actual measurement data, namely reference measurement data, of an actually printed decoration to be compared with other actual measurement data, namely print measurement data, of another actually printed decoration. It only has to be ensured that the decor printed on the reference surface corresponds exactly to the desired decor. Otherwise, the digital template would have to be adjusted until the decor printed on the reference surface corresponds to the desired decor.
• the predetermined criterion is met when a deviation of one or more of the pressure measurement data from the corresponding reference measurement data is greater than a limit value predetermined for the corresponding measurement variables.
• the predetermined limit value is particularly preferably dependent on color and/or location. In this way weightings can be made. If, for example, a particular color has a very large effect for a certain decor, for example because it stands out brightly or because a lot is used to print the decor, it is advantageous to ensure that the deviation is particularly small with this color. In this case, the color-dependent limit value for this color is selected to be particularly small, so that even relatively small deviations mean that the digital template has to be changed.
• the color-dependent limit value can be selected.
• location dependencies Deviations at the edge of the decoration may be less relevant than deviations directly in the field of vision, for example in the middle of the decoration.
• Some discrepancies between the reference measurement data and the print measurement data are due to reasons that cannot be remedied by changing the digital template, for example. This concerns, for example, the case that an incorrect primer was applied or color changes were caused by a change of supplier for printing ink or base paper. This cannot or can hardly be remedied by changing the digital template, so that in this case a correction criterion is not met.
• the correction criterion indicates whether the deviation detected by the measure of the deviation can be corrected by changing the digital template. If this is the case, the decor is changed according to step E2a. Otherwise, according to step E2b, the method is aborted and a corresponding warning signal is output.
• At least one further printing surface is printed with the decoration to be printed during steps C. to E. of the method.
• the correction or modification of the digital template has no effect on the decor that is printed directly afterwards.
• the changes to the digital template only become effective for the decor after next or an even later one.
• they are printed with a digital template that has not yet been modified they contain the same error as this has not yet been corrected. They are also faulty and may therefore be produced as scrap.
• the question of how many further print surfaces are printed during steps C. to E. depends on the performance of an electronic data processing device that is responsible for these steps and carries them out. The faster the data processing device can carry out the steps, the sooner the necessary change to the digital template will be available and the fewer additional decorations will be printed.
• the cycle frequency of the printing system also has a major influence on this.
• Changes to the digital template and/or the ascertained dimensions of the deviation for the different runs of the method are preferably stored and preferably stored in an electronic data memory.
• the pressure measurement data preferably relate to the same points and/or the same area of the decoration as the reference measurement data. This makes it particularly easy to compare the respective measurement data with one another.
• the print measurement data and the reference measurement data relate to the entire decor. This means in particular that there are a large number of measurement points at which the respective measurement data are determined, and this large number of measurement points extends over the entire decoration.
• the measuring points are preferably distributed equidistantly over the decoration.
• a device for carrying out a method of the type described here preferably contains an electronic data processing device, in particular a computer or a microchip, which is set up to carry out the method.
• the device has at least one sensor that is set up to record the measurement data.
• the at least one sensor transmits the measurement data as signals to the electronic data processing device, which receives them with a receiving module.
• a comparison module compares the measurement data, which is transmitted by the at least one sensor, with reference measurement data, which is preferably stored in an electronic data memory to which the receiving module has access. In this way, a measure of the deviation is determined, which is then transferred to an evaluation module.
• This evaluation module checks whether the extent of the deviation has met a predetermined criterion.
• the change that needs to be made to the digital template is determined in a change module. This is then transmitted to the printing system so that the next decor to be printed is printed using the changed digital template.
• the reception module, the comparison module, the evaluation mode and the change module are implemented in the electronic data processing device and can be embodied as software, ie in particular as a computer program product.
• the digital template does not correspond to the entire decor, but only to a part. This makes sense if, for example, the data processing capacity is not sufficient to use the entire decor as a basis for the process. In addition, it must be ensured that deviations that are only found in the part of the decor that corresponds to the digital template are meaningful for the overall decor.
• an ACMS or AVT monitoring system can be used to acquire the measurement data.
• the measurement data is recorded, for example, in the lab system. This measurement data can easily be compared with one another, with Lab values or hyperspectral lines, for example, being compared with one another, which for example have a resolution of preferably 80 to 100 dpi, particularly preferably 90 dpi for each measured value.
• a measure for the deviation can be determined in this way, which can be specified as a percentage. In this way, it is particularly easy to determine criteria which, if met, require the digital template to be changed.
• the method is ended when 3, preferably 5, particularly preferably 10 consecutive changes to the digital template have not resulted in the extent of the deviation no longer meeting the predetermined criterion, i.e. the printed decorations meet the desired quality standard.
• An electronic certificate is preferably created for the decor printed on the print surface and particularly preferably stored if the extent of the deviation does not meet the predetermined criterion, ie the desired quality is present.
• a wood decor was printed on paper using a digital paper printing system.
• the working width was 2070 mm.
• the speed was 135 m/min.
• a white decorative paper with a basis weight of 65 g/m 2 and water-based CRYK ink and an inline primer application of approx. 3 g/m2 is used.
• the wood decor had repeat dimensions of 1400 mm in length and 2070 mm in width.
• An ipac inline monitoring system was installed across the entire width (2070 mm) of the production plant.
• a digital template of the decor was saved. During production, print measurement data was recorded and saved for every repeat, i.e. every printed decor.
• the similarity index i.e.
• a measure of the deviation from the reference measurement data is calculated from this pressure measurement data.
• the predetermined criterion was set at 92% before the start of production. So if the degree of deviation falls below 92% in this case, the digital template must be changed. A similarity index of 89% was calculated for the repeat 1.264 produced.
• the measurement data showed that the deviation in this case is essentially on the b-axis, ie on the yellow-blue line (eg 5% to blue). Since the deviation is above the specified tolerance, the measurement data is automatically transferred to the Colorgate software and a corrected digital template of the wood decor is calculated and saved. After automatic transmission to the output device, i.e.
• the print file (digital template) previously used for the print job is automatically replaced by the corrected digital template of the wood decor and made available as a print file for the following report.
• a similarity index of 94% is calculated from the next print measurement data to the reference measurement data.
• the period from the measurement of the pressure measurement data of an entire decor to the output of the modified digital template of the wood decor was one repeat length (approx. 0.62 seconds). In this case, an entire repeat was measured, saved and a deviation was identified. The subsequent report is still printed with the uncorrected digital template, since this time is needed for the calculation and the exchange.
• a wood decor was produced on a digital panel printing system (working width 2070 mm, panel size 2070 x 2800 mm, speed 80 m/min, 8 mm HDF panels, white primed, CRYK water-based ink, inline primer application approx. 3 g/m2) a wood decor was produced.
• the wood decor has repeat dimensions of 2800 mm in length and 2070 mm in width. The gap between the plates was 140 cm.
• An ipac inline monitoring system was installed across the entire width (2070 mm) of the production plant.
• a digital template of the decor was saved. During production, print measurement data is recorded and saved for each repeat, i.e. for each printed decor. The similarity index to the reference measurement data is calculated from this pressure measurement data.
• the predetermined criterion was set at 94% before the start of production. So if the degree of deviation falls below 94% in this case, it is preferable to change the digital template.
• a similarity index of 92% was calculated for the repeat 863 produced.
• the measurement data showed that the deviations are essentially on the L axis > light-dark (eg 4% to dark). Since the deviation is above the specified tolerance, the measurement data is automatically transferred to the Colorgate software and a corrected digital template of the wood decor is calculated and saved. After automatic transfer to the output device, the print file (digital template) previously used for the print job was automatically replaced by the corrected digital template of the wood decor and made available as a print file for the following report. After the corrected digital template of the wood decor was issued, a similarity index of 96% was calculated from the first print measurement data.
• a wood decor was printed on paper using a digital paper printing system.
• the working width was 2070 mm.
• the speed was 135 m/min.
• a white decorative paper with a basis weight of 65 g/m 2 and water-based CRYK ink and an inline primer application of approx. 3 g/m 2 were used.
• the wood decor had repeat dimensions of 1400 mm in length and 2070 mm in width (.
• the gap between the boards was 140 cm.
• an ipac inline monitoring system was installed over the entire width (2070 mm).
• the decor was a digital template is saved. During production, print measurement data is recorded and saved from each repeat, i.e. from each printed decor.
• the similarity index to the reference measurement data is calculated from these print measurement data.
• the predetermined criterion was set at 95% before the start of production "So if the degree of the deviation is less than 95% in this case, the digital template must be changed.
• a similarity index of 63% was calculated for the produced repeat 4,587.
• the measurement data showed that the deviation was essentially on the L axis are > light-dark (e.g. 30% too dark) Since the deviation is above the specified tolerance, the Mes s data is automatically transferred to the Colorgate software and a corrected digital template of the wood decor is calculated and saved. After automatic transmission to the output device, the print file (digital template) previously used for the print job is automatically replaced by the corrected digital template of the wood decor and made available as a print file for the following report. After the corrected digital template of the wood decor was issued, a similarity index of 75% was calculated from the first print measurement data.
• the production plant was stopped, the dryer was set lower and production continued.
• a wood decor was printed on a digital panel printing system (working width 2070 mm, panel size 2070 mm x 2800 mm, speed 80 m/min, HDF panels with a thickness of 8 mm, white primed, CRYK water-based ink, inline primer application approx. 3 g/m2). produced.
• the wood decor has repeat dimensions of 2800 mm in length and 2070 mm in width.
• the gap between the plates was 140 cm.
• An ipac inline monitoring system was installed across the entire width (2070 mm) of the production plant. During production, print measurement data is recorded and saved for each repeat, i.e. for each printed decor. The similarity index to the reference measurement data is calculated from this pressure measurement data.
• the predetermined criterion was set at 90% before the start of production. So if the degree of deviation in this case is less than 90%, it is preferable to change the digital template. A similarity index of 58% was calculated for the repeat 1123 produced. The measurement data showed that the deviation is essentially on the L axis > light-dark (e.g. 35% too dark). Since the deviation was above the specified tolerance, the measurement data was automatically transferred to Colorgate and a corrected digital template of the wood decor was calculated and saved. After automatic transmission to the output device, the print file (digital template) previously used for the print job is automatically replaced by the corrected digital template of the wood decor and made available as a print file for the following report. After the corrected digital template of the wood decor was issued, a similarity index of 74% was calculated from the first print measurement data.
• the reason for the discrepancy was that the plate temperature was too low, which meant that the applied ink dried too slowly and sank too deeply into the surface of the plate.
• the software could not correct this strong deviation.
• a signal tone sounded which draws the machine operator's attention to the deviation and the production system stops automatically.
• the machine operator can check and correct the parameters of the printing system and continue production.

Landscapes

• Printing Methods (AREA)
• Drying Of Solid Materials (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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Citations (6)

• 2020
  • 2020-08-24 EP EP20192455.2A patent/EP3960479B8/fr active Active
  • 2020-08-24 ES ES20192455T patent/ES2949185T3/es active Active
  • 2020-08-24 PL PL20192455.2T patent/PL3960479T3/pl unknown
• 2021
  • 2021-08-24 EP EP21766464.8A patent/EP4200138A1/fr active Pending
  • 2021-08-24 CN CN202180051664.9A patent/CN115968333A/zh active Pending
  • 2021-08-24 US US18/022,111 patent/US20230339234A1/en active Pending
  • 2021-08-24 CA CA3190035A patent/CA3190035A1/fr active Pending
  • 2021-08-24 WO PCT/EP2021/073355 patent/WO2022043307A1/fr unknown

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