DE102018121299B4 - Process for adjusting a layer thickness of a covering coating material to be applied to a substrate by an application device - Google Patents

Abstract

Method for setting a layer thickness of an opaque coating material to be applied to a substrate by an application device (04), the coating material being applied to different points on the substrate in a printing press or in a paper processing machine, the coating material being applied to at least a first point on the respective substrate is applied in a grid having several grid points and at at least one other second point on the relevant substrate in each case over the entire surface, with the relevant first point on the relevant substrate in each case forming a grid field and the relevant second point on the relevant substrate in each case forming a full tone field , wherein a layer thickness of the coating material applied to the substrate with the application device (04) is monitored with a detection device (12), the detection device (12) reading from the covering coating material applied to the substrate at the respective first and second point during ongoing operation of the printing machine or the paper-processing machine collects measured values inline and/or online, with a control unit (06) connected to the detection device (12) using the measured values of the detection device (12) to generate a value for an optical density of the respective point on the The layer of coating material applied to the substrate is determined, characterized in that the control unit (06) determines a value determined during a growing layer build-up for the opacity of the layer of coating material applied to the substrate in that the control unit (06) uses the current printing process from the layer thickness of the coating material applied by the application device (04) to the substrate in question, for which the value for the optical density determined in a grid field corresponds to the value for the optical density determined in a full tone field, as that layer thickness of the coating material with an opacity value of 100 %, with the determination relating to the layer thickness of the coating material with an opacity value of 100% being made in that the control unit (06) stores currently provided operating data and/or control data of the application device (04) in a storage device (19) in association with the stores an opacity value of 100% for the layer thickness of the coating material, with the control unit (06), following the determination made, setting the layer thickness of the coating material to be applied by the application device (04) to at least one further substrate in such a way that the layer thickness with the application device ( 04) for the opacity to be applied to the at least one further substrate layer of the coating material reaches the value previously set in the control unit (06) and/or maintains it during ongoing operation of the printing press or the paper-processing machine.

Description

The invention relates to a method for adjusting a layer thickness of a covering coating material to be applied to a substrate by an application device according to the preamble of claim 1.

through the DE 35 43 444 A1 a method for achieving a uniform print result on an autotypically working multi-color printing machine is known, in which the supply of the printing inks to adjacent color zones of a printing material can be changed by means of actuators and in which full tone densities and/or screen dot sizes are repeatedly determined on measuring fields also printed within the color zones in order to control the printing process and if the same fall out of the tolerance ranges assigned to them, corrective action is taken in the printing process by actuating the actuators, wherein to maintain the color balance during the printing process, repeatedly selected relationships of solid densities and/or halftone dot sizes of different printing colors to one another are determined and also if the selected relationships fall out of them associated tolerance ranges is corrected by actuating the control elements in the printing process.

through the DE 10 2006 053 843 A1 a method for controlling the optical density in an electrographic printing method is known, in which the toner layer thickness of a toner image developed with a developer station is scanned with a capacitive sensor and its toner layer thickness signal is used to control the inking in the developer station and with a moisture sensor the air humidity and the air humidity signal are used to compensate for humidity-dependent deviations in the toner layer thickness signal and/or to regulate the inking in the developer station.

through the DE 199 10 367 A1 there is known a method of controlling a plurality of ink controllers in a printing press, the press repetitively printing an image on a substrate, the ink controllers each controlling the amount of ink delivered to a corresponding color key zone on the substrate, the method comprising the steps of: a) measuring color values of a plurality of pixels of a selected image printed on the substrate to produce a captured image frame, b) aligning the captured image frame with a target image frame that includes target color values of a plurality of pixels, c) comparing the captured image frame with the Desired field of view on a pixel-by-pixel basis, d) determining a matrix equation relating color controller settings to changes in color values of the image printed on the substrate via sensitivity factors for each of the plurality of pixels, e) obtaining a solution using the least squares method of the matrix equation to determine the color settings for each color button zone, and f) communicating the color settings to the color controllers, the step of measuring the color values for a plurality of pixels of a selected image printed on the substrate , preferably using a color video camera to capture the color values.

through the DE 10 2014 011 151 A1 a method for color control in printing machines with a computer by detecting color areas on a surface to be printed with a color measuring device is known, the surface to be printed being a printing material, the printing material being coated with opaque white, the color measuring device detecting a plurality of measured color values of opaque white and wherein the computer compares the detected color measurement values of the opaque white with one another or against a reference color value of the opaque white and stores the deviations determined during the comparison in the computer, the printing material coated with opaque white being overprinted with color measurement patches, the overprinted color measurement patches being recorded by the color measurement device and wherein the computer takes into account the influence of the stored deviations determined in the comparison for the regulation of the inking of the color measurement values of the color measurement fields underlaid with opaque white with the desired color values of the printing template.

through the DE 10 2007 005 018 A1 a method for color control of copies of a printing press is known, in which a substrate, which appears dark in a standard-compliant color measurement, is printed with at least one printing ink, which is lighter than the substrate, and at least one color value of the printing ink is determined from a measured variable, wherein the color value of the at least one printing color is controlled using a specified reference value of a color location in the color space that is lighter than the printing color.

In manufacturing technology, coating is a main group of manufacturing processes DIN 8580 (Edition 2003-09), which are used to apply a firmly adhering layer of amorphous substance to the surface of a solid carrier material, also known as a substrate. The corresponding process and the applied layer itself are referred to as coating.

The following is about a liquid or a pasty, ie spreadable, or a to apply powdered coating material to a substrate in a machine coating process. After it has been applied and optionally after physical drying and/or chemical curing, the coating material on the substrate preferably forms a layer that is thin in comparison to the material thickness of the substrate, e.g. B. in the micrometer range or in the nanometer range. The coating materials also include film-forming paints or paints, which also include z. B. in the graphics industry or in printing technology used printing inks, paints, inks or inks and z. B. coating colors used in the paper industry for surface finishing are counted.

In the embodiment preferred here, the substrate is in the form of a printing material. The printing material consists in particular of paper, cardboard, cardboard, sheet metal, textiles, glass, ceramics or a foil made of metal or a plastic. a z. B. from paper, cardboard, cardboard, foil, sheet metal or textiles formed printing material is in particular flat as a sheet or as a web of material. a z. B. from sheet metal, plastic, glass or ceramic formed substrate can also be used as a hollow body, z. B. as a container, preferably as a can or as a cup or as a bottle or as a tube. The coating material to be applied to the respective substrate is preferably a colorant, ie a coloring inorganic or organic substance which can be of natural or synthetic origin and has pigments or at least one dye.

The coating to be carried out according to the invention takes place in particular in an industrial process in a machine processing the respective substrate, preferably in a printing press or in a paper processing machine.

The coating material to be applied to the respective substrate can be opaque or glazing. A translucent coating material can be transparent, i. H. image or view permeable, or translucent, d. H. be partially translucent. In contrast, a covering coating material is opaque, at least above a certain layer thickness applied to the respective substrate, i. H. opaque. Translucency and opacity are therefore reciprocal properties. The opacity is therefore a measure of the opacity or turbidity of translucent, i. H. scattering translucent materials and layers. In the paper sector, it is common to specify the opacity for a sheet or sheet according to ISO 2471. The opacity is approximately defined there as 0=100% minus light transmission. A sheet of paper with a light transmission of 1% has an opacity of 99%.

In printing technology, opaque printing inks are often used for functional or decorative reasons. These inks can B. basic colors such as red, green and blue or cyan, yellow, magenta and black or opaque white or various metallic colors such. B. be gold or silver.

A in an industrial process with an application device z. B. in a printing machine or in a paper-processing machine application of a coating material to a substrate is carried out to support the production of a desired quality of the coating during ongoing operation of the printing machine or the paper-processing machine inline and / or online, d. H. during production inside and/or outside of the respective machine i. i.e. R. with a non-contact detection device, z. B. with a working in an optoelectronic measuring method detection device, preferably densitometrically or spectrophotometrically controlled in particular continuously. With this check, it is of particular interest to gain knowledge of the layer thickness already applied to the respective substrate. The problem is that when checking an opaque coating material in a densitometric or spectrophotometric measurement method, e.g. B. for the optical density or a brightness value or a color point of the coating material in question from a certain applied layer thickness, namely at the latest when an opacity of 100% is reached. Consequently, there is a risk that the covering coating material will be applied to the respective substrate in an unnecessarily large layer thickness in the industrial process, which is at least uneconomical and also unnecessarily weighs down the respective substrate.

An application device arranged in a printing machine or in a paper processing machine for the mechanical application of a coating material to a substrate preferably has a metering device controlled or regulated by a control unit, this metering device being controlled by a setting, e.g. B. a width of at least one outflow opening of a reservoir storing the coating material and/or a stroke of a lifter transferring the coating material, with the lifter transferring the coating material from a reservoir storing it to a roller applying or transferring it, and/or a rotational speed of a den Coating material apply ing or transferring roller, in particular a ductor, in each case influences a quantity of the coating material to be applied to the substrate.

The invention is now based on the object of creating a method for adjusting a layer thickness of an opaque coating material to be applied to a substrate by an application device, in particular in a printing press or in a paper processing machine, with which the layer thickness applied by the application device to the substrate in question of the covering coating material is set to a predetermined value, in particular to a value associated with an opacity of 100%, and/or kept constant at this value.

The object is achieved according to the invention by the features of claim 1. The dependent claims relate to advantageous refinements and/or developments of the solution found.

A first solution consists in particular in that a control unit connected to the detection device uses the measured values of the detection device to determine a value, which is dependent in particular on the layer thickness, for the opacity of the layer of coating material applied to the substrate, with the control unit determining the value transmitted by the application device to at least one additional The layer thickness of the coating material to be applied to the substrate, preferably based on at least one value of the opacity determined during a growing layer build-up, is adjusted in such a way that the layer of the coating material to be applied to the at least one further substrate with the application device for the opacity has a value previously defined in the control unit, preferably in the range of at least 95% to 100% achieved and/or maintained during ongoing production operations.

A second solution can consist in the coating material being applied to various points on the substrate in question by means of the application device in a printing process, with the coating material being applied to at least one first point on the substrate in question in a grid having a plurality of grid points and to at least one other second point on the substrate in question is applied over the entire surface, with the first point in question on the substrate in question forming a grid field and the second point in question on the substrate in question forming a full tone field, with a control unit connected to a detection device from the detection device on the The data recorded at the respective first and second location on the relevant substrate determines a respective value for the optical density of the layer of the coating material applied at the relevant locations on the substrate, with the control unit determining the layer thickness currently being applied by the application device to the relevant substrate in the ongoing printing process of the coating material, for which the value for the optical density determined in a grid field corresponds to the value for the optical density determined in a full tone field, as that layer thickness of the coating material with an opacity value of 100%.

The advantages that can be achieved with the invention are, in particular, that the layer thickness of the covering coating material applied by the application device to the substrate in question is reduced to a value previously specified in the control unit, in particular to a value associated with an opacity in the range of at least 95% to 100% can be set and/or kept constant at this value. As a result, the consumption of the covering coating material is optimized, particularly in an industrial process carried out by a printing machine or a paper processing machine.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

• 1 eine Maschineneinheit einer Druckmaschine mit einer Auftrageinrichtung;
• 2 einen Bogen mit mindestens einem Druckbild und mit einem Messstreifen.

Show it:

• 1 a machine unit of a printing machine with an application device;
• 2 a sheet with at least one printed image and with a measuring strip.

The invention is explained below without limitation using the example of a printing press, preferably a rotary printing press, in particular a sheet-fed rotary printing press. The printing machine can start its printing process e.g. B. in an offset printing process or in a flexographic printing process or in a screen printing process or in an inkjet printing process.

1 shows a simplified and schematic section of the printing press, a machine unit 01 with a transport device arranged in a frame 03 for transporting at least one e.g. B. each formed as a sheet 13 substrate ( 2 ), This transport device z. B. at least one transport cylinder 02, in the preferred embodiment in the transport direction T of the at least one substrate, preferably one after the other several, e.g. B. three or more transport cylinders 02 in a row. The respective direction of rotation of the transport cylinders 02 is indicated by a directional arrow. At the respective transport cylinders 02 z. Holding elements, e.g. designed as grippers or as suction devices, fix the respective substrate to the relevant lateral surface of the respective transport cylinder 02 during its transport from one transport cylinder 02 to the next transport cylinder 02. The respective transport cylinders 02 are e.g. B. formed several times, so that one behind the other two or three or even more substrates are arranged or at least can be arranged on their respective circumference.

The one in the 1 The machine unit 01 shown has, in cooperation with one of the transport cylinders 02, an application device 04 for applying an opaque coating material to the respective substrate transported by the relevant transport cylinder 02 during its rotation. This opaque coating material is z. B. an opaque ink z. B. is designed as a base color or as an opaque white or as a metallic color. A layer thickness of the coating material applied to the substrate using application device 04 is e.g. B. in the micrometer range or in the nanometer range. In a printing press, the application device 04 is e.g. g. as a metering device that is controlled or regulated by a control unit 06, with this metering device being configured in each case by adjusting the width of at least one outflow opening of a reservoir storing the coating material, e.g. B. ink fountain or squeegee system 09, and/or a cycle of a lifter transferring the coating material and/or a rotational speed of a roller transferring or applying the coating material, e.g. g. ductor 07 and/or applicator roller 08, each influences the quantity of the coating material to be applied to the substrate. The application device 04 can be positioned in the printing machine in the transport direction T of the at least one substrate, e.g. B. may be arranged in front of a printing unit belonging to the printing press in order to z. B. first apply an opaque white to the respective substrate before the layer formed from the opaque white is at least partially overprinted with at least one other printing ink. On the other hand, the application device 04 can also be arranged in the printing press in the direction of transport T of the at least one substrate downstream of a printing unit belonging to the printing press, in order to at least partially overprint at least one printing ink that has already been applied to the respective substrate and thus e.g. B. to produce a backlit printed product with a special effect. The covering coating material can be applied to the respective substrate over the entire surface, partially or in a rastered manner. The layer of the covering coating material applied to the respective substrate with the application device 04 in the printing press can also be or be underlaid with a primer layer for better adhesion. If necessary, the covering coating material can also be applied several times to the same substrate in the printing machine, in which case z. B. more than just a single machine unit 01 is arranged, each with an application device 04. Furthermore, a device for physical drying and/or chemical curing can be provided in the printing press in transport direction T of the at least one substrate downstream of application device 04, with the device for physical drying e.g. B. as a hot air dryer 11 and / or as an infrared dryer 11 and the device for chemical hardening z. B. as a UV dryer 11 are formed.

The layer thickness of the coating material applied to the substrate using application device 04 is monitored using a detection device 12, with detection device 12 collecting measured values from the covering coating material applied to the respective substrate while the printing press is in operation, i.e. during production, inline and/or online. The inside of the press or outside the press, z. The detection device 12 arranged, for example, on a measuring table is connected to the control unit 06, with the control unit 06 determining a value for the opacity of the layer of coating material applied to the substrate from the recorded measured values provided by the detection device 12. The signal paths and signal directions from the detection device 12 via the control unit 06 to the application device 04 are shown in FIG 1 indicated by directional arrows. In particular, operating data and/or control data can also be provided bidirectionally between control unit 06 and application device 04. It is provided that, following the determination of the current value for the opacity of the layer of coating material already applied to the substrate, control unit 06 sets the layer thickness of this coating material to be applied by application device 04 to at least one additional substrate in such a way that the coating material applied with application device 04 a layer of coating material to be applied to the at least one additional substrate for the opacity, e.g. B. by means of a manual or automated input fixed, preferably freely selectable value is generally achieved within the framework of permissible tolerances and/or generally maintained within the framework of the specified tolerances during ongoing operation of the printing press. In the preferred embodiment, the Control unit 06 controls application unit 04 in such a way that the layer of coating material to be applied to the at least one additional substrate with application unit 04 reaches a value in the range of at least 95% to 100% for the opacity and/or maintains this value during ongoing operation of the printing press.

The detection device 12 preferably works without contact and/or with an optoelectronic measuring method and/or densitometrically or spectrophotometrically. In a particularly preferred embodiment, the detection device 12 is configured as a camera, e.g. g. as a greyscale camera or as an RGB camera or as a CMYK color measurement camera, with control unit 06 e.g. B. by evaluating one or more images recorded by the camera of the substrate, d. H. the current value for the opacity of the layer of coating material applied to the substrate is determined from at least one photographic image or from the image data on which it is based. In a further embodiment variant, the detection device 12 is designed as a reflection light scanner. Control unit 06 sets the layer thickness of the coating material applied to the substrate by application device 04, based in particular on at least one opacity value determined during a growing layer build-up, e.g. B. in a run-up of the printing press or in another operating phase of the printing press, in which the translucency of the layer of coating material applied to the substrate steadily decreases to opacity.

2 shows a substrate designed as a sheet 13 with at least one printed image 14 and with a measuring strip 16 extending transversely to the transport direction T of the substrate in question, in particular across the width of the printed image 14. The measuring strip 16 has a plurality of measuring fields 17 lined up, with individual measuring fields 17 . B. full surface or gridded z. B. in the printing press according to 1 are each coated with a coating material in an industrial process using the application device 04 described. In the preferred embodiment, the basis of 1 The detection device 12 described is directed at at least one measuring field 17 in the measuring strip 16 of the sheet 13, with the control unit 06 connected to the detection device 12 determining the respective value of the opacity of the layer of coating material applied in the at least one measuring field 17 in the measuring strip 16 of the sheet 13 . It can be provided that the control unit 06 determines the respective value of the opacity of the layer of coating material applied in each case from several or all measuring fields 17 in the measuring strip 16 of the sheet 13 and, depending on the value determined for the opacity of the layer of coating material applied in each case sets the layer thickness to be applied by the application device 04 to at least one subsequent sheet 13 individually, i.e. as required, for several or each of the zones 18 corresponding to at least one measuring field 17 and extending in the transport direction T of the sheet 13 in question. A further embodiment variant provides for the respective value of the opacity of the respectively applied layer of the coating material to be recorded at at least one preferably selectable position in the at least one printed image 14 printed on the sheet 13 instead of or in addition to the detection in at least one of the measuring fields 17 of the measuring strip 16 capture.

Provision can also be made for the coating material to be applied to different points on the relevant sheet 13, usually simultaneously, using application device 04 in the same printing process. The different locations on the relevant sheet 13 are z. B. at least two different measuring fields 17 of the same measuring strip 16 or at least two different elements in the same printed image 14. It is provided that the coating material is applied to at least one first location on the relevant sheet 13 in a grid having a plurality of grid points and at least one other second place on the relevant sheet 13 is applied over the entire surface. In concrete terms, this means, for example, that the coating material is applied over the entire surface by means of the application device 04 in the same printing process, in particular at least in one of the measuring fields 17 of the relevant measuring strip 16 in a grid having a plurality of grid points and in at least one other measuring field 17 of this measuring strip 16. a z. B. as a measuring field 17 trained first point on the sheet 13 in question, where the coating material is applied in a grid, is also referred to as a grid, whereas a z. B. as a measuring field 17 formed second point on the sheet 13 in question, where the coating material is applied over the entire surface, is also referred to as a solid field. From the data recorded by the recording device 12 at the respective first and second point on the relevant sheet 13, the control unit 06 determines, e.g. B. image data, a respective value for the optical density of the layer of coating material applied at the relevant points on the sheet 13.

The control unit 06 also preferably sets the respective value DR determined from a grid field for the optical density to the respective value DV determined from a solid tone field for the optical density e.g. B. by forming a quotient DR / DV in a ratio. Since the optical density is proportional to the amount of per unit area on the sheet 13 at the relevant locations on the sheet 13 z. B. in the respective measuring fields 17 of the measuring strip 16 applied coating material, the value DR for the optical density determined in a grid field in a printing process is at least initially lower than the value DV for the optical density determined in a full tone field. However, with increasing layer thickness of the coating material applied in a grid field, e.g. B. due to a spread of the local halftone dots and/or optical effects, an increase in the optical density determined in the relevant halftone field is accompanied by an increase in the optical density from the respective value DR for the optical density determined from a halftone field and the respective value DV for the ratio formed optical density changes significantly. The control unit 06 now adds the layer thickness of the coating material currently applied by the application device 04 to the relevant sheet 13 in the ongoing printing process, particularly if it detects a significant change in the ratio formed from the optical densities, i.e. as a function of this determination where the value DR for the optical density determined in a grid field corresponds to the value DV for the optical density determined in a full tone field, as that layer thickness of the coating material with an opacity value of 100%. The significant change in the ratio formed from the optical densities can e.g. B. consist in the value of a quotient formed from these optical densities in a series of several consecutive data collections, ie surveys of these optical densities, initially approaching the value 1, but then for a preferably previously determined number of subsequent data collections at least almost unchanged Value 1 remains. In a series of several successive surveys of the relevant optical densities, the control unit 06 thus checks a course or a behavior of this ratio for a significant change, ie a change that exceeds permissible tolerance limits. The layer thickness of the coating material with an opacity value of 100% is determined e.g. B. in that the control unit 06 stores the currently provided operating data and/or control data of the application device 04 in a storage device 19 in association with an opacity value of 100% for the layer thickness of the coating material. Following the determination made, control unit 06 sets the layer thickness of the coating material to be applied by application unit 04 to at least one additional substrate, i.e. in particular at least one additional sheet 13, in such a way that the layer of the coating material to be applied to the at least one additional substrate using application unit 04 Coating material for the opacity has the value of 100% in the further printing process, in particular during operation of the printing press or the paper processing machine and thus maintains it.

Reference List

01

machine unit

02

transport cylinder

03

frame

04

application setup

05

-

06

control unit

07

ductor

08

application roller

09

squeegee system

10

-

11

hot air dryer; infrared dryers; UV dryer

12

detection device

13

arc

14

print image

15

-

16

gages

17

measuring field

18

Zone

19

storage device

20

-

DR

Optical density value in a grid

dv

Value for the optical density in a solid patch

T

transport direction

Claims (13)

Method for setting a layer thickness of an opaque coating material to be applied to a substrate by an application device (04), the coating material being applied to different points on the substrate in a printing press or in a paper processing machine, the coating material being applied to at least a first point on the substrate in question in each case in a grid having a plurality of grid points and at at least one other second location on the relevant one substrate is applied over the entire surface, with the relevant first point on the relevant substrate forming a grid field and the relevant second point on the relevant substrate each forming a solid field, with a layer thickness of the coating material applied to the substrate using the application device (04) being recorded using a detection device (12) is controlled, wherein the detection device (12) collects measured values inline and/or online from the covering coating material applied to the substrate at the respective first and second location during ongoing operation of the printing press or the paper processing machine, with a The control unit (06) connected to the detection device (12) uses the measured values from the detection device (12) to determine a value for an optical density of the layer of coating material applied to the relevant point on the substrate, characterized in that the control unit (06) generates a value during a growing layer structure for the opacity of the layer of coating material applied to the substrate is determined in that the control unit (06) calculates the layer thickness of the coating material currently being applied to the relevant substrate by the application device (04) in the ongoing printing process, at which the value for the optical density determined in a grid field corresponds to the value for the optical density determined in a full tone field, as that layer thickness of the coating material with an opacity value of 100% defines, the definition relating to the layer thickness of the coating material with an opacity value of 100% takes place in that the control unit (06) stores currently provided operating data and/or control data of the application device (04) in a storage device (19) in association with the opacity with a value of 100% for the layer thickness of the coating material, the control unit (06) Following the determination made, set the layer thickness of the coating material to be applied by the application device (04) to at least one additional substrate in such a way that the layer of coating material to be applied to the at least one additional substrate by the application device (04) for the opacity corresponds to the previously specified in the Control unit (06) reaches the specified value and/or maintains it during operation of the printing machine or the paper-processing machine. procedure after claim 1 , characterized in that the control unit (06) sets the application device (04) in such a way that the layer of coating material to be applied to the at least one further substrate with the application device (04) has a value in the range of at least 95% to 100% for the opacity achieved and/or maintained during ongoing operation of the printing press or paper processing machine. procedure after claim 1 or 2 , characterized in that a printing material is used as the substrate, the printing material consisting of paper, cardboard, cardboard, sheet metal, textiles, glass, ceramics or a foil made of metal or a plastic and/or the printing material being a hollow body or flat is designed as a sheet (13) or as a web of material. procedure after claim 1 or 2 or 3 , characterized in that a liquid or pasty or powder-form coating material is used and/or that a colorant is used as the coating material, the colorant being in the form of a coloring inorganic or organic substance and/or the colorant being of natural or synthetic origin and/or or wherein the colorant comprises pigments or at least one dye. procedure after claim 1 or 2 or 3 or 4 , characterized in that the coating material is physically dried and/or chemically cured after it has been applied to the respective substrate and/or that the layer thickness of the coating material applied to the substrate with the application device (04) is in the micrometer range or in the nanometer range. procedure after claim 1 or 2 or 3 or 4 or 5 , characterized in that at least one opaque printing ink is used as the coating material, the opaque printing ink in question being designed as a base color or as an opaque white or as a metallic color. procedure after claim 1 or 2 or 3 or 4 or 5 or 6 , characterized in that the detection device (12) continuously collects measured values during ongoing operation of the printing press or the paper processing machine and/or that the detection device (12) works without contact and/or with an optoelectronic measuring method and/or densitometrically or spectrophotometrically. procedure after claim 1 or 2 or 3 or 4 or 5 or 6 or 7 , characterized in that the application device (04) has a metering device that is controlled or regulated by a control unit (06), this metering device being adjusted in each case by adjusting the width of at least one outflow opening of a reservoir storing the coating material and/or a cycle of a coating material transfer device Hebers and / or a rotation speed speed of a roller (07; 08) applying or transferring the coating material influences an amount of the coating material to be applied to the substrate in question. procedure after claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th , characterized in that the control unit (06) sets the layer thickness of the coating material applied to the substrate in question by the application device (04) on the basis of at least one opacity value determined during the growing layer build-up. procedure after claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th or 9 , characterized in that the detection device (12) the respective value of the opacity of the layer of coating material applied in each case in at least one measuring field (17) of a measuring strip (16) extending on the substrate in question transversely to its transport direction (T) and/or on at least one position in a printed image (14) printed on the substrate in question. procedure after claim 10 , characterized in that the control unit (06), depending on the determined value for the opacity of the layer of coating material applied in each case, calculates the layer thickness to be applied by the application device (04) onto at least one further substrate for several or each of with at least one measuring field (17) corresponding zones (18) extending in the transport direction (T) of the relevant substrate. procedure after claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th or 9 or 10 or 11 , characterized in that the detection device (12) is designed as a camera, the control unit (06) determining the current value for the opacity of the layer of coating material applied to the substrate in question by evaluating one or more images recorded by the camera . procedure after claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th or 9 or 10 or 11 or 12 , characterized in that the printing machine carries out its printing process in an offset printing process or in a flexographic printing process or in a screen printing process or in an inkjet printing process.

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