EP3807607A1 - Procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports - Google Patents

Procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports

Info

Publication number
EP3807607A1
EP3807607A1 EP19732918.8A EP19732918A EP3807607A1 EP 3807607 A1 EP3807607 A1 EP 3807607A1 EP 19732918 A EP19732918 A EP 19732918A EP 3807607 A1 EP3807607 A1 EP 3807607A1
Authority
EP
European Patent Office
Prior art keywords
digital
image
printing
color
printed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19732918.8A
Other languages
German (de)
English (en)
Inventor
Ingo Lehnhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flooring Technologies Ltd
Original Assignee
Flooring Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flooring Technologies Ltd filed Critical Flooring Technologies Ltd
Publication of EP3807607A1 publication Critical patent/EP3807607A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0009—Central control units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/08—Print finishing devices, e.g. for glossing prints
    • 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
    • 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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/44—Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
    • B41J3/46—Printing mechanisms combined with apparatus providing a visual indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/463—Colour matching
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformations in the plane of the image
    • G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
    • G06T3/4023—Scaling of whole images or parts thereof, e.g. expanding or contracting based on decimating pixels or lines of pixels; based on inserting pixels or lines of pixels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00002—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for
    • H04N1/00005—Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for relating to image data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
    • H04N1/6036—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis involving periodic tests or tests during use of the machine
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • H04N1/6033—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis
    • H04N1/6047—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer using test pattern analysis wherein the test pattern is part of an arbitrary user image
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
    • H04N25/44—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by partially reading an SSIS array
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/2823—Imaging spectrometer
    • G01J2003/2826—Multispectral imaging, e.g. filter imaging
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10032—Satellite or aerial image; Remote sensing
    • G06T2207/10036—Multispectral image; Hyperspectral image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/20—Special algorithmic details
    • G06T2207/20212—Image combination
    • G06T2207/20216—Image averaging

Definitions

  • the invention provides a method and apparatus for on-line quality control of decorative prints on substrates, comprising comparing similarity of a digital actual image and a digital target image of the printed designs and adjusting the decor pressure upon detecting deviations of the color values of the digital actual image. Image of the color values of the digital target image during the production of a batch of carrier materials with a decorative layer.
  • the color is an essential feature of a printed decor which can be obtained by various techniques, e.g. Gravure printing or digital printing is generated. In each of these techniques, the desired appearance of printing is achieved by overlaying different pigment layers of the primary colors.
  • the gravure printing process is a printing technique in which the elements to be imaged are formed as depressions in a printing form, e.g. a pressure roller, which is colored before printing. The ink is located primarily in the wells and is transmitted due to contact pressure of the printing plate and adhesive forces on the object to be printed.
  • digital printing on the other hand, the print image is transferred directly from a computer to a digital printer, such as a digital printer. a laser printer or inkjet printer, eliminating the use of static printing plates.
  • CMYK Digital printing usually uses the primary colors cyan, magenta, yellow and black (CYMK).
  • CYMK cyan, magenta, yellow and black
  • the CMYK color model is a subtractive color model, where the abbreviation CMYK stands for the three color components cyan, magenta, yellow and the black component Key as the color depth.
  • CMYK stands for the three color components cyan, magenta, yellow and the black component Key as the color depth.
  • An open problem which is a central issue in all areas of the color-based or color-processing industry, is the achievement of a high degree of color fidelity, in other words the ability to produce given colors with minimal chromatic difference with respect to an original, and especially on different substrates, to reproduce.
  • An essential step for this is the analysis of the color composition of a given original. Detected color differences can then be used to adjust the color composition during the printing of a decor on a substrate or a batch of a substrate with a decor, so that desired quality requirements are achieved.
  • a quality requirement Among other things, it consists in the fact that color deviations between a digital target image and a digital actual image of the printed decoration occur only below a predetermined target value.
  • Suitable support materials are, for example, paper, glass, metal, films, wood-based panels, in particular MDF or HDF panels, WPC panels, veneers, lacquer coatings, plastic panels and inorganic support panels.
  • Preferred according to the invention are wood-based panels.
  • Wood-based panels provided with a decor are frequently used for the production of floor laminate or in the form of wall and ceiling paneling elements.
  • the coating of wood-based panels was often used with decorative paper, whereby the variety of differently patterned decorative papers has no limits.
  • decorative papers As an alternative to the use of decorative papers on wood-based panels, the possibility of direct printing of wood-based panels has been developed, with a printing of paper and its subsequent lamination or direct coating is omitted on the wood-based panels.
  • the printing techniques mainly used here are the above-mentioned gravure and digital printing methods.
  • Digital printing makes it possible to produce a print image with particularly high quality through a higher resolution and also allows a wider range of applications with high flexibility.
  • the disadvantage of increased costs of digital printing technology per print, in particular in comparison with conventional printing methods such as gravure printing occurs in the background.
  • Such a combination of digital printing with other printing methods, such as gravure printing can be accomplished e.g.
  • Another open problem is thus the achievement of a high degree of color fidelity, ie the ability to provide given colors with minimal chromatic difference in relation to an original, especially when using different printing techniques.
  • WO 2008034156 A1 relates to a method for comparing the similarity of objects or digital object images recorded by two objects using statistical methods.
  • identical or congruent image areas are selected from the two object images or the two object images represent identical or congruent image areas, that for each of these two identical or congruent image areas with the same function, the Statistical distribution of the intensities of the individual pixels and / or predetermined pixel areas is determined that the similarity of the statistical distributions of the intensities obtained for the two identical or congruent image areas by statistical methods, in particular with a similarity function is checked and that the extent of similarity The two statistical distributions of the intensities are used as a measure of the similarity of the two objects.
  • WO 2008080185 A2 relates to a method for similarity comparison of two objects, in which digital object images, in particular an actual image and a target image, recorded by the two objects are compared, identical or congruent regions being selected for the comparison from the two object images, or the two object images represent identical or congruent image regions, characterized in that each of the object images provided or used by the two objects, in particular the actual image and the target image, comprises an image set of at least two images, preferably of a multiplicity of images and, for each of the two image sets, the intensity values, in particular gray values or color values, for each pixel of the image region of the individual images are represented in the form of a vector pair.
  • hyperspectral sensor system a sensor system that can record images of very many closely spaced wavelengths. The eye sees the environment multispectral in the wavelengths of the primary colors red, green and blue. Hyperspectral systems record data from 20 to 250 different channels, ranging from ultraviolet wavelengths to longwave infrared wavelengths.
  • the advantage of hyperspectral systems is that images are captured and stored with very high level of detail and resolution.
  • a disadvantage is that for the production of hyperspectral images, a high computational effort and for the storage of hyperspectral images requires a large storage space.
  • the object of the invention is to provide a method for online quality control of decorative prints on substrates, which is simple, very fast and profitable and thus the disadvantages of the prior art can be overcome.
  • the object of the invention is achieved by a method for online quality control of decorative prints on carrier materials according to claim 1 and an apparatus according to claim 13.
  • the invention provides a method for on-line quality control of decorative prints on substrates comprising comparing similarity of an actual digital image and a digital target image of the printed designs and adjusting the decor pressure upon detecting deviations of the color values of the digital actual image from the Color values of the digital target image during the production of a batch of support materials with a decorative layer, wherein
  • hyperspectral digital image of a print decoration can be done by means of a hyperspectral system, such as a hyperspectral camera or, preferably, a hyperspectral scanner.
  • a hyperspectral system such as a hyperspectral camera or, preferably, a hyperspectral scanner.
  • ACMS ® Advanced Color Measurement System
  • Hyperspectral systems have a variety of detectors. The result of the recording is a hyperspectral data cube with two spatial and one spectral dimension. Four basic techniques are available for generating this hyperspectral data cube. With a so-called snapshot, the entire data set is delivered with a single detector output. In spatial scanning, each detector output provides the spectrum of a narrow strip of the original.
  • each detector output provides a monochromatic spatial map of the original.
  • each detector output provides a spectrally encoded spatial map of the original.
  • Calibration in the sense of the invention means that from at least one, preferably several, more preferably 2, 3, 4 or 5, particularly preferably 3 hyperspectral digital images of one or more originals of the printed decoration via a similarity comparison a kind hyperspectral digital "average image", for example with average color values are generated or average numerical color values are determined which can be provided as a so-called "similarity index”.
  • the calibration according to step b) of the method according to the invention can, for example, by means of a similarity comparison of describe two images as described in WO 2008034156 A1.
  • the similarity comparison of hyperspectral digital images is characterized in that hyperspectral images of the printed decoration are provided in the form of an image set with a number of respectively corresponding images,
  • Identical or congruent image areas are selected from the images of the image sets or these images are identical or congruent image areas
  • the calibration according to step b) of the method according to the invention can be carried out by means of a similarity comparison of the hyperspectral digital template images as described in WO 2008080185 A2.
  • the similarity comparison of the hyperspectral digital images according to step b) of the method according to the invention comprises the similarity comparison of two hyperspectral digital images of the printed decoration, in particular an actual image and a target image, wherein identical or congruent regions are selected for the comparison from the two hyperspectral digital images or represent the two hyperspectral digital images identical or congruent image areas, characterized in that
  • Target image an image set of at least two images, preferably of a plurality of images (1, 2, 3 ...; 1 ', 2', 3 ',.
  • the intensity values for each of the two image sets, the intensity values, in particular gray values or
  • Color values, for each pixel of the image area of the individual images (1, 2, 3 ...; 1 ', 2', 3 ',.) are represented in the form of a vector (n, n'),
  • the difference angle (Q) of the vector v and the difference angle (q') of the vector v ' are respectively determined with respect to a reference vector (v ref ), from these angles Q and q' a pair of values ( q, q ') is formed and these values are plotted against each other in a diagram or these pairs of values are represented in a diagram as a point cloud,
  • the method for similarity comparison according to WO 2008080185 A2 is characterized in that the vector formed by the two gradients (ki, k 2 ) and the two abscissa sections (di, d 2 ) normalized or normalized by standard methods or the Length of the normalized vector is determined and the number obtained is considered as a measure of the similarity of the images to be compared, in particular the actual image and the target image. Further details of this method for similarity comparison are described in WO 2008080185 A2 and known to the person skilled in the art.
  • the result of the calibration step b) of the method according to the invention is an average hyperspectral digital image, ie the digital target image of the printed decoration, which is based on a very extensive data set and its display, for example on a monitor, high computing power and high storage capacity of the data processing system requires, with the aid of the method of the invention is carried out.
  • average color values of the decoration are provided as setpoints in the form of a similarity index with which a similarity comparison with color values of actual images of the decoration could be made.
  • both alternatives are based on the fact that the actual images of the decors would also have to be present as hyperspectral images in order to ensure comparability with the desired image or the nominal values of the similarity index.
  • the inventive method is therefore characterized in that a digital target image in method step c) by converting a calibrated hyperspectral image into an image file with a resolution in the range of 4 to 36 megapixels, preferably 4 to 24 megapixels, particularly preferred is generated in the range of 4 to 12 megapixels.
  • Conversion of a calibrated hyperspectral image to a lower resolution image file can be accomplished by, for example, a computer program or by printing a substrate with the printing decor on the target digital image and then scanning using a color scanner or photographing the printed decoration using a digital camera.
  • Method step c) provides an image file of reduced resolution, and thus with reduced storage space requirement and significantly lower processing power in the display of the corresponding image.
  • This image file or the digital image with a resolution in the range of 4 to 36 megapixels is therefore particularly suitable for use in online quality control during the production process of decoratively printed substrates.
  • the method according to the invention comprises the step:
  • the production of the decorative print on a carrier material can be done both by gravure printing as well as by digital printing.
  • the method according to the invention for on-line quality control of decorative prints on carrier materials is equally suitable for printed designs which have been produced by gravure printing or by digital printing.
  • At least one digital actual image preferably a plurality of actual digital images of the printed decoration on the at least one first carrier material with a resolution in the region of 4 is then produced from this print decoration on the carrier material by gravure printing or digital printing to 36 megapixels, preferably 4 to 24 megapixels, more preferably in the range of 4 to 12 megapixels, generated and stored.
  • the resolution of the digital actual image always corresponds exactly to the resolution of the digital target image in order to ensure the comparability of desired image and actual image.
  • the production of the digital actual images can be done with any standard digitizer, such as a color scanner or a digital camera. It is preferred if the digital actual image is generated and stored in the form of a digital photograph.
  • the production of the digital photographs according to method steps c) and e) takes place under equivalent conditions, in particular excluding changing external light influences and with identical resolution in the range of 4 to 36 megapixels, preferably 4 to 24 megapixels. most preferably in the range of 4 to 12 megapixels. Also useful is the use of the same digitizer in the generation of the digital target image and the actual digital images.
  • the color deviations are not due to external influences but to variations of properties of the carrier material, such as color, wettability with the printing inks, or the like, or variations in the performance of the decor pressure, such as variations in the inks, especially batch changes, or variations in the application amount of the printing inks can be attributed.
  • properties of the carrier material such as color, wettability with the printing inks, or the like
  • variations in the performance of the decor pressure such as variations in the inks, especially batch changes, or variations in the application amount of the printing inks can be attributed.
  • color deviations between the digital target image and the digital actual image are determined in method step f), then these data are used for printing control according to method step g), ie used to perform the printing of at least one side of further carrier materials to form a decorative layer that color deviations between the digital target image and actual digital images of the printed decors occur on the further carrier materials only below a predetermined desired value.
  • the setpoint for possible color deviations can be set individually depending on the requirements and in particular is set so that the production of rejects can be minimized or avoided.
  • a warning signal may be issued to the operator of a printing line for substrates, thereby enabling the operator to manually intervene in the printing process and manually adjust one or more color values of the L * a * b * color space and / or of the L * C * h ° color space during the production of the printed decoration on the carrier materials or, if appropriate, for color deviations which are outside a predetermined tolerance range, to stop the production process.
  • the A warning signal can be issued either acoustically as a warning tone or visually in the form of a colored warning light, warning lamp or display on the monitor of a process computer or a data processing system, which controls the pressure of the decors on the carrier materials.
  • the method according to the invention is particularly advantageous if, during the production of a batch of carrier materials to form a decorative layer, the production of digital actual images takes place continuously and if the method steps f) and g) are repeated continuously. This makes it possible in a suitable manner to produce entire batches and also batch-printed decors on substrates whose color appearance varies only above a predetermined target value or within a predetermined tolerance range, whereby the production of rejects is minimized or avoided.
  • the L * , a * and b * values are determined in the color measurement in the so-called L * a * b * color space.
  • the L * a * b * color space is a color space covering the range of perceptible colors.
  • the L * a * b * color space is described by a three-dimensional coordinate system.
  • the L * axis describes the brightness (luminance) of the color with values from 0 (black) to 100 (white).
  • the a * axis describes the green or red portion of a color, with negative values for green and positive values for red.
  • the b * axis describes the blue or yellow part of a color, with negative values for blue and positive values for yellow.
  • the scales of the a * axis and the b * axis include a number range of -150 to +100 and -100 to +150.
  • the value for the brightness L * is dependent on the decor, ie is to be determined specifically for each decor and can be, for example,>10,>20,>30,>40,>50,>60,>70,> 80 or> 90 be.
  • the values for a * and / or b * are, for example, in a range between -100 and +100, -80 and +80, -60 and +60, -40 and +40 or -20 and +20.
  • the values for a * and / or b * are in a range between -10 and +10.
  • the values for a * and / or b * are in a range between -5 and +5.
  • the values for a * and / or b * are close to zero.
  • the color measurement of the digital target image and the actual digital image can be performed by means of a computer program that is located on a data processing system for printing control is stored, done.
  • the digital target image is preferably stored in the memory of the data processing system.
  • the actual digital images, which are preferably generated continuously, are continuously compared with the digital target image. Subsequently, the profiling of the color data takes place on the basis of the color deviations determined by processing the L * , a * and b * values determined during the continuous measurement with a computer program.
  • a computer program preferably a so-called RIP software is used.
  • the L * , C * and h ° values are determined in the color measurement in the so-called L * C * h ° color space.
  • L * C * h ° color space is the L * a * b * color space
  • C * chroma, relative saturation, removal of the L-axis , English chroma
  • h ° hue angle, angle of hue in the L * a * b * color circle, English hue angle
  • RIP (raster imaging process) software is a software for calculating color values.
  • the measured color values are converted into the standard color system CYMK for digital printing.
  • Adjusting the color values for digital printing means that the proportions of the individual components of the CYMK standard color system are changed.
  • the proportions of the individual components of the CYMK standard color system are changed so that taking into account the determined brightness or the determined color deviations between the digital target image and the digital actual image (each with a resolution in the range of 4 to 36 megapixels, preferably 4 to 24 megapixels, particularly preferably in the range of 4 to 12 megapixels no color deviations occur between the printed decors of the carrier plates at least a first batch and / or each additional batch.
  • the adaptation of the color values can alternatively be used for intaglio printing with a plurality of, preferably 2, 3, 4 or 5, particularly preferably 3, pressure rollers.
  • a plurality of, preferably 2, 3, 4 or 5, particularly preferably 3, pressure rollers For each platen, one or even more than one color channel is used e.g. two or three color channels.
  • the pressure rollers provided with the associated color information taking into account the determined brightness or the determined color deviations between the digital target image and the digital actual image (each with a resolution in the range of 4 to 36 megapixels, preferably 4 to 24 megapixels , Particularly preferably in the range of 4 to 12 megapixels generated a decor in gravure printing, such that no color deviations between the printed decors of the carrier plates at least a first batch and / or each additional batch occur.
  • Set points or tolerance ranges are specified either for one or more color values of the L * C * h ° color space and / or the L * a * b * color space.
  • deviations of one or more color values of the L * C * h ° color space and / or the L * a * b * color space of the actual digital images of the printed decors from the corresponding color values of the digital target image are only intended to be below one predetermined setpoint of 30%, preferably 25%, more preferably 20%, particularly preferably 15% occur.
  • deviations of one or more color values of the L * C * h ° color space and / or the L * a * b * color space of the actual digital images of the printed decors from the corresponding color values of the digital target image should only be within a predetermined tolerance range of ⁇ 20%, preferably ⁇ 15%, more preferably ⁇ 10%, most preferably ⁇ 5%.
  • the digital printing for printing on at least one side of a wood-based panel may be carried out using a digital printer with a water-based digital printing ink, a UV- or solvent-based ink. Preference is given to the use of a water-based digital printing ink.
  • the amount of digital printing ink used may be between 5 and 15 g / m 2 , preferably 6 and 8 g / m 2 .
  • At least one primer layer comprising at least one resin and / or at least one varnish is applied to the side of the wood-based panel to be printed before printing with a decor. or is hardened.
  • the side of the wood-based panel to be printed is sanded before applying the primer.
  • an aqueous resin solution and / or a radiation-curable filler may be applied to the side of the substrate to be printed.
  • a primer e.g. aqueous resin solutions such as melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin can be used. It is also possible to pre-coat or prime the support material with 1K / 2K acrylate, UV and / or ESH filler and then cure this primer layer accordingly.
  • an aqueous resin solution comprising an aqueous resin solution, in particular an aqueous solution of a melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin is used for the pre-coating or priming of the wood-based panel.
  • the amount of liquid resin solution applied to the primer may be between 10 and 80 g / m 2 , preferably 20 and 50 g / m 2 .
  • the solids content of the aqueous resin solution is between 30 and 80%, preferably 40 and 60%, particularly preferably 55%.
  • the liquid resin may additionally comprise suitable wetting agents, hardeners, release agents and defoamers. After application of the aqueous resin solution on the wood-based panel for precoating or primer derselbigen the liquid resin is dried to a humidity of 10%, preferably 6%, for example in a convection oven or near-infrared oven.
  • the wood-based panel can be precoated or primed with 1K / 2K acrylate, and / or ESH filler.
  • a UV filler preferably consists essentially of UV-curable coating components, pigments, reactive diluents and radical formers as chain starters.
  • the application rate of the filler may in this case be 50 to 150 g / m 2 , preferably 50 to 100 g / m 2 .
  • the quantities are based on a 100% filler.
  • the putty used for the primer is pigmented, whereby the printing result can be varied or improved.
  • Particularly preferred according to the invention is the precoating of the wood-based panel with a transparent primer.
  • At least one layer of a pigmented primer which is preferably water-based, is applied to the side of the wood-based panel to be printed prior to printing the at least one side of the wood-based panel.
  • the pigmented primer can be applied either directly on the untreated surface of the material plate or on the previous, preferably transparent primer.
  • the waterborne pigmented primer may also be applied in more than one layer (e.g., 3 to 10 layers, preferably 5 to 8 layers, more preferably 7 layers), with the pigmented primer after each coat application e.g. is dried in a convection dryer or a near-infrared dryer.
  • the water-based pigmented primer preferably contains at least one pigment of a light color, more preferably at least one white pigment.
  • White pigments are achromatic inorganic pigments with a high refractive index (greater than 1, 8), which are mainly used to produce optical whiteness in paints or as a filler in z. As plastics are used.
  • White pigments according to the invention may be selected from the group comprising titanium dioxide, lithopone, barium sulfate, zinc oxide, Zinc sulfide and calcium sulfate.
  • Lithopone is a white pigment that contains barium sulfate and zinc sulfide.
  • titanium dioxide is preferably used as a white pigment in the water-based pigmented primer, since titanium dioxide has the highest refractive index and thus the highest hiding power among the known white pigments.
  • At least one protective layer preferably two or three layers comprising abrasion-resistant particles, natural fibers, synthetic fibers and / or further additives, to the printing decoration or printing décors, where resins such as melamine-formaldehyde resin, urea-formaldehyde Resin, acrylate resins and polyurethane resins can be used as suitable binders.
  • the abrasion-resistant particles are preferably selected from the group consisting of aluminum oxides, corundum, boron carbides, silicas, silicon carbides and glass beads.
  • natural and / or synthetic fibers in particular fibers selected from the group comprising wood fibers, cellulose fibers, wool fibers, hemp fibers and organic or inorganic polymer fibers are used.
  • conductive substances As additives, conductive substances, flame retardants, luminescent substances and metals may be added.
  • the conductive substances may be selected from the group comprising carbon black, carbon fibers, metal powder and nanoparticles, in particular carbon nanotubes. It is also possible to use combinations of these substances.
  • flame retardants phosphates, borates, in particular ammonium polyphosphate, tris (tri-bromneopentyl) phosphate, zinc borate or boric acid complexes of polyhydric alcohols are preferably used.
  • the luminescent substances used are preferably fluorescent and / or phosphorescent substances based on inorganic or organic substances, in particular zinc sulfite and alkaline earth aluminates.
  • the printed substrate material which is optionally provided with a protective layer, in particular of formaldehyde resins, is further processed or finished in a short-cycle (KT) press.
  • KT short-cycle
  • the resin layers are melted and the laminate is cured to a laminate.
  • surface structures in the surface of the carrier material such as a wood-based panel, can also be produced using a structured press plate, which optionally can be designed to match the décor (so-called decorsynchronous structure).
  • the structures may be in the form of pore structures that follow the grain. at For many decors, the structures can be depressions in the area of the seam of filling lines filled with the decor.
  • the present method is carried out in a device for online quality control of decorative prints on substrates, wherein the device
  • At least one means for generating and storing a digital target image of the printing decor having a resolution in the range of 4 to 36 megapixels, in particular in the form of a digital photograph;
  • At least one means for determining color deviations between the digital target image and the digital actual image At least one means for determining color deviations between the digital target image and the digital actual image
  • the means for producing a hyperspectral digital image of a printed decor is preferably a hyperspectral scanner and / or the means for producing the at least one actual digital image of the printed decoration, preferably a conventional color scanner or digital camera.
  • the device according to the invention comprises at least one means for applying a protective layer to the carrier material decorated with the respective print. This means or device for applying a protective layer is preferably arranged after the printing line.
  • the device according to the invention has at least one short-cycle press for pressing the carrier material provided with the printing decoration and the protective layer arranged thereon.
  • Figure 1 the state of the art quality control of printed designs based on hyperspectral scans
  • Figure 2 the online online quality control of decorative prints on substrates according to the invention.
  • calibration of a printing decoration (D1) in which images of a plurality of substrates printed and thus produced (P1, P2, P3) by the same printing decor (D1) comprises generation of hyperspectral images by means of digital ACMS ® (Advanced Color Measurement system) (ACMS P1 D1; P2 ACMS D1, ACMS P3 D1).
  • ACMS P1 D1; P2 ACMS D1, ACMS P3 D1 Advanced Color Measurement system
  • the generation of hyperspectral digital images by means of ACMS can be carried out, for example, with a hyperspectral true-color scanner, which has the following properties:
  • hyperspectral digital images of printed substrates of an ongoing production would have to be continuously generated and processed by means of ACMS (Pn D1 / ACMS Pn D1) in order to compare them with the calibrated decor based on hyperspectral digital images ( D1 / ACMS D1).
  • the inventive method is a development of the method of Figure 1.
  • During calibration several decorative prints and the respective generation of a hyperspectral image with ACMS occur. If the values obtained correspond to the similarity specifications, this decor is released for further processing.
  • the creation of the calibrated decoration on the basis of hyperspectral digital images (D1 / ACMS D1) is followed by the generation of a nominal digital image (F D1) with a lower resolution in the range from 4 to 36 megapixels.
  • This digital target image is stored in a database for the online quality control method according to the invention and used in each further production of this decoration for a quick comparison. In the present case, the digital target image (F-D1) was generated as digital photography.
  • digital actual images are generated at continuous time intervals.
  • the recording of the digital actual images is carried out under approximately the same conditions, largely isolated from variable external light influences, such as by an open only to the object tube in which the recording device and possibly a necessary lighting are placed.
  • the actual digital images (F Pn D1) are continuously subjected to a similarity comparison with the digital target image (F-D1). In this case, for example, one or more color values of the L * a * b * color space and / or the L * C * h ° color space are determined and compared with one another.
  • the production can be intervened and the production process can be influenced. This can be done manually. This is indicated to the operator of a production plant via a signal if corresponding deviations from color values occur.
  • This signal may be, for example, an acoustic signal or a visual signal in the form of signal lights or colored displays on the monitor of a process computer. For example, a green visual signal indicates that no color deviations have been measured between the target digital image and the actual digital image. A visual signal in the color yellow indicates color deviations.
  • a visual signal in the color red indicates color deviations that move outside of a predetermined tolerance range or above a predetermined target value.
  • an intervention in the production process by the operator of the production plant is necessary. This can, for example, stop the current production or correct the pressure for one or more color channels so that color deviations occur only within the specified tolerance range or below a predetermined setpoint.
  • an automatic adjustment of the decor print may take place, so that color deviations no longer occur or they are kept so low that the color deviations occur only within a permissible tolerance range or below a predetermined setpoint.
  • a titanium dioxide-containing primer-coated HDF sheet (8 mm) was decorated by indirect gravure printing using multiple rolls.
  • a decor a wood decor was chosen.
  • a 3-color system was used with 3 roller applicators, with which successively different colors are applied.
  • the inking rollers were engraved accordingly, so that ink was added to the engraving, transferred to a rubber roller and then printed on the carrier.
  • a digital photo (actual image) was generated by means of a digital camera in a resolution of 12 megapixels.
  • the color values of the L * a * b * color space of this actual image were compared with the color values of the L * a * b * color space of a digital target image.
  • the digital target image was prepared by previously calibrated by hyperspectral digital images (ACMS) same decoration and generating a digital photograph thereof with a resolution of 12 megapixels. This process was repeated for every tenth HDF plate of each production lot.
  • the actual digital images were taken in each case under the same conditions by a tube opened only to the object in which the digital camera and a lighting were placed.
  • the target value for permitted color deviations was set at 20% for the individual values of the L * a * b * color space. In the similarity comparison of the color values of the digital target image and the digital actual image, only deviations were found that were below the specified target value. Intervention in the production process was therefore not necessary and subsequent carrier plates were printed with the same decor using the same printing conditions.
  • a variety of titanium dioxide-containing primer-coated HDF sheets (8 mm) were printed with a digital printer with a wood decor.
  • the inks were water based. Every tenth printed HDF plate produced a digital photo (actual image) using a digital camera with a resolution of 8 megapixels.
  • the color values of the L * a * b * color space of this actual image were compared with the color values of the L * a * b * color space of a digital target image.
  • the digital target image had previously been prepared by calibration of hyperspectral digital images of the same decoration by means of ACMS and generation of a digital photograph thereof with a resolution of 8 megapixels.
  • the actual digital images were taken in each case under the same conditions by a tube opened only to the object in which the digital camera and a lighting were placed.
  • the target value for permitted color deviations was set at 15% for the individual values of the L * a * b * color space.
  • deviations were found for the color values a * and b * of 17% and 20% in the digital actual images. The color deviations were transmitted to the control computer of the printing line.
  • the digital print was automatically adjusted to the color values of the digital target image.
  • every tenth printed HDF plate produced a digital photo (actual image) using a digital camera with a resolution of 8 megapixels.
  • the renewed similarity comparison showed that color deviations for all color values of the L * a * b * color space now occurred below the predetermined target value of 15%.
  • the printed HDF plates according to embodiments 1 and 2 are processed further as follows:
  • the printed HDF plates were separated in front of the production line and transported through the subsequent production line at a speed of 28 m / min.
  • a first roller application unit about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the plate surface.
  • a melamine resin is also applied with the first roller application unit (application rate: 60 g resin fl. / M 2 , solids content: about 55% by weight).
  • 14 g of corundum / m 2 (F 200) are sprinkled onto the surface with a spreader. By a distance of about 5 m to the dryer, the corundum is allowed to sink into the melamine resin. Then the plate passes through a circulating air dryer.
  • a melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries.
  • a melamine resin is also applied with a roller application unit (application rate: 50 g resin fl. / M 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
  • a melamine resin is applied to the plate surface, which additionally contains glass beads. These have a diameter of 60 - 80 pm.
  • the application rate of the resin is about 20 g melamine resin fl. / M 2 (solids content: 61, 5% by weight).
  • the formulation also contains a release agent.
  • the order quantity of glass beads is about 3 g / m 2 .
  • a melamine resin is also applied with a roller application unit (application rate: 40 g resin fl. / M 2 , solids content: about 55% by weight).
  • the plate is again dried in a circulating air dryer and then coated again with a melamine resin containing glass beads.
  • cellulose Vivapur 302
  • 20 g melamine resin fl. / M 2 solids content: 61, 6 wt%) are applied.
  • 3 g of glass beads and 0.25 g of cellulose / m 2 are applied.
  • the formulas also contain a release agent.
  • a melamine resin is also applied with a roller application unit (application rate: 30 g of resin fl. / M 2 , solids content: about 55% by weight).
  • the resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 .
  • the pressing time was 10 seconds.
  • the structural element used was a press plate with a wood structure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Quality & Reliability (AREA)
  • Biomedical Technology (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
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  • Spectrometry And Color Measurement (AREA)
  • Image Processing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports, comprenant la comparaison de similitude d'une image réelle et d'une image cible des décors imprimés et le réglage de l'impression décorative lors de la détection d'écarts des valeurs de couleur de l'image réelle par rapport aux valeurs de couleur de l'image cible pendant la production d'une quantité de matériaux supports avec une couche décorative, a) au moins une image numérique hyper-spectrale d'un décor imprimé étant produite; b) ladite décoration d'impression étant calibrée au moyen de ladite au moins une image numérique hyper-spectrale; caractérisé en ce que ledit procédé comprend en outre les étapes suivantes c) la production et le stockage d'une image numérique de consigne de la décoration imprimée avec une résolution comprise entre 4 et 36 mégapixels, en particulier sous la forme d'une photographie numérique; d) la production d'au moins une première décoration imprimée sur au moins un premier matériau support; e) la production et la sauvegarde d'au moins une image numérique réelle de la décoration imprimée sur au moins un premier matériau support ayant une résolution comprise entre 4 et 36 mégapixels, notamment sous la forme d'une photographie numérique; f) la détermination d'écarts de couleur entre l'image numérique de consigne et l'image numérique réelle par un programme informatique; g) l'impression sur au moins une face d'autres matériaux supports avec formation d'une couche décorative de telle sorte que les écarts de couleur entre l'image numérique de consigne et les images numériques réelles des décors imprimés sur les autres matériaux supports ne soient inférieurs à une valeur prédéterminée de consigne ou se produisent à l'intérieur d'une plage de tolérance spécifiée. En outre, l'invention concerne un dispositif permettant d'effectuer le contrôle de la qualité en ligne des impressions décoratives sur des matériaux supports.
EP19732918.8A 2018-06-06 2019-06-06 Procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports Withdrawn EP3807607A1 (fr)

Applications Claiming Priority (2)

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EP18176271.7A EP3578939B1 (fr) 2018-06-06 2018-06-06 Procédé de contrôle de qualité en ligne de l'impression de décors sur des matériaux supports
PCT/EP2019/064777 WO2019234147A1 (fr) 2018-06-06 2019-06-06 Procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports

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EP3807607A1 true EP3807607A1 (fr) 2021-04-21

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EP18176271.7A Active EP3578939B1 (fr) 2018-06-06 2018-06-06 Procédé de contrôle de qualité en ligne de l'impression de décors sur des matériaux supports
EP19732918.8A Withdrawn EP3807607A1 (fr) 2018-06-06 2019-06-06 Procédé de contrôle de qualité en ligne d'impressions décoratives sur des matériaux supports

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JP (1) JP7046232B2 (fr)
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CN (1) CN112243491B (fr)
AU (1) AU2019283408B2 (fr)
BR (1) BR112020024133B1 (fr)
CA (1) CA3099949C (fr)
CL (1) CL2020003067A1 (fr)
EA (1) EA039645B1 (fr)
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HU (1) HUE052890T2 (fr)
LT (1) LT3578939T (fr)
MX (1) MX2020013235A (fr)
PT (1) PT3578939T (fr)
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CA3099949A1 (fr) 2019-12-12
MX2020013235A (es) 2022-01-06
JP2021520504A (ja) 2021-08-19
US11548274B2 (en) 2023-01-10
UA125740C2 (uk) 2022-05-25
CL2020003067A1 (es) 2021-05-07
AU2019283408B2 (en) 2021-02-04
EP3578939A1 (fr) 2019-12-11
PT3578939T (pt) 2020-11-24
KR102312246B1 (ko) 2021-10-13
KR20210009384A (ko) 2021-01-26
WO2019234147A1 (fr) 2019-12-12
BR112020024133A2 (pt) 2021-02-17
SI3578939T1 (sl) 2021-02-26
LT3578939T (lt) 2020-12-28
EA039645B1 (ru) 2022-02-21
CN112243491A (zh) 2021-01-19
EP3578939B1 (fr) 2020-09-30
BR112020024133B1 (pt) 2021-10-26
CN112243491B (zh) 2022-04-12
ES2833523T3 (es) 2021-06-15
EA202092697A1 (ru) 2021-01-14
JP7046232B2 (ja) 2022-04-01
US20210245493A1 (en) 2021-08-12
HUE052890T2 (hu) 2021-05-28
AU2019283408A1 (en) 2020-12-10

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