EP3445590A1 - Procédé et dispositif d'impression numérique d'objets tridimensionnels - Google Patents

Procédé et dispositif d'impression numérique d'objets tridimensionnels

Info

Publication number
EP3445590A1
EP3445590A1 EP17717729.2A EP17717729A EP3445590A1 EP 3445590 A1 EP3445590 A1 EP 3445590A1 EP 17717729 A EP17717729 A EP 17717729A EP 3445590 A1 EP3445590 A1 EP 3445590A1
Authority
EP
European Patent Office
Prior art keywords
printing
print
printed
image
print head
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.)
Granted
Application number
EP17717729.2A
Other languages
German (de)
English (en)
Other versions
EP3445590B1 (fr
Inventor
Thomas SCHNITGER
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.)
Dekron GmbH
Original Assignee
Dekron GmbH
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 Dekron GmbH filed Critical Dekron GmbH
Publication of EP3445590A1 publication Critical patent/EP3445590A1/fr
Application granted granted Critical
Publication of EP3445590B1 publication Critical patent/EP3445590B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/005—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for serial printing movements superimposed to character- or line-spacing movements
    • 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
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles

Definitions

  • the invention relates to a method for digital printing of 3-dimensional objects, in particular bottles, cans or other hollow bodies, by means of at least one print head, wherein the object to be printed moves relative to the print head for printing, in particular rotates, and wherein a print original, preferably in a digitizing section, is decomposed into a plurality of printing dots (pixels) and the printing dots are stored in a printing grid consisting of image columns and image lines, wherein the printing grid is used to control the print head during printing to apply a printed image to the object to be printed.
  • the print image is transferred directly from a computer to a printing press without the use of a static printing form.
  • these methods include inkjet printing, in which small droplets of ink are shot from the nozzles of the print head in a targeted manner onto the surface to be printed in order to produce a printed image there.
  • the image to be printed (image or print original) is first rastered.
  • Screening is a software-based process in which the artwork is "converted" into print data.
  • the centerpiece is "Raster Image Processing”.
  • the term screening is based on the fact that an image is subdivided into discrete pixels (pixels) at fixed intervals. The purpose of this is a grid-like printing grid with grid cells or meshes. For the respective cell, the corresponding color information of the respective discrete pixel is stored.
  • the result of the screening is a raster graphic consisting of a grid-like arrangement of pixels.
  • the print original can be optically scanned, for example by means of a scanner, and subdivided or decomposed into pixels. It is also state of the art to convert computer generated graphics (eg, vector graphics) directly to raster graphics.
  • the coordinates associated with the pixels and the color information stored for the respective coordinates are supplied to the program control for the spray nozzles of the print head for generating the print image.
  • the halftoning process also called image scanning, can be described in that a virtual grid consisting of rows and columns is placed over the artwork and the color values (intensity values) are stored in the individual grid cells with the associated grid coordinates (row X, column Y j ) , During this process, the print template is read into the grid or print grid. The result is a matrix with color information stored in the cells.
  • the artwork is recorded using a two-dimensional Cartesian coordinate system (Cartesian image grid).
  • Cartesian coordinate system Cartesian image grid
  • Such a coordinate system is formed of mutually orthogonal axes X and Y and is of a grid-like structure with rectangular cells.
  • the resolution of the image is determined by the size of the grid cells. For example, the distance between two horizontal grid lines determines the print resolution in the vertical direction. The distance between two vertical grid lines determines the print resolution in the horizontal direction.
  • quantization takes place. Quantization is the evaluation of the pixel, ie the brightness (intensity) and possibly the hue of a pixel by means of a specified gray value or color quantity in the individual screen cells.
  • the color information is saved with the corresponding coordinate of the grid (line X, column Y j ).
  • the digital image data are used to control the printhead.
  • the print head moves the raster coordinates of the print image and generates print dots at the locations specified by the print raster in accordance with the color information stored for the individual print spot (eg quantity, color).
  • the result is a print image consisting of raster-shaped pixels.
  • the print head has at least one print nozzle, but usually a plurality of print nozzles, which are arranged side by side in a row of nozzles, wherein the nozzle row extends in the direction of the print head width. Only one row of nozzles is a single-row printhead. The distance between the two outermost nozzles of the row determines the effective printhead width. With a uniform arrangement in the row, the individual pressure nozzles are arranged offset in the row direction in each case by a nozzle spacing. The native printhead resolution of the single-row printhead along the printhead width is given by the nozzle pitch.
  • the typical print head width of about 70 mm today therefore causes a pressure difference of 7 mbar between a top and a bottom pressure nozzle of a print head with multiple print nozzles results when the print nozzles are arranged vertically one above the other.
  • the drop volume is no longer uniform when printing.
  • the lower pressure nozzles with the higher internal pressure (corresponding to the lower negative pressure) print a slightly larger drop than the upper nozzles with a lower internal pressure. This manifests itself in the color intensity, since more ink is applied in an area printed by the lower printing nozzles than in a region printed by the upper printing nozzles. This is particularly noticeable when, due to the stitching, drops of the lower and upper pressure nozzles adjoin one another. This enhances the optical error impression in the viewer.
  • DE 35 26 769 A1 describes a method for printing on containers, in which the container rotates in front of the print head and in the direction of its rotation. is moved onsachse. The individual color dots are applied along parallel helices. This eliminates the need to interrupt the printing process. Due to the relative movements, however, the printing result may be adversely affected if the print head applies the individual colors according to the values in the printing screen.
  • the nozzles or nozzle heads are offset in the direction of the container longitudinal axis against each other and thus are not in a plane.
  • the invention is based on the idea of enabling an endless printing of infinite image lengths on 3-dimensional objects, without the pressure having to be divided into individual work cycles.
  • An essential idea of the invention is that the print grid, which is used to control the print head during printing and into which the print original is read, is not rectangular, but is curved or distorted and that the image lines and the image columns or the X axis and the Y-axis is not vertical, but run diagonally to each other. It is a slanting grid.
  • the rows and columns or the X-axis and the Y-axis are not orthogonal but, for example, at an angle of less than 90 ° to each other.
  • the curvature of the print screen can be compared to a distortion of a Cartesian coordinate system.
  • a regular rectangular printing grid can be distorted by offsetting one of the opposite sides of a rectangle by a certain distance (offset / shift), so that a parallelogram with corresponding parallelogram grid cells is created.
  • the sides adjacent to the offset side undertake a pivoting motion as in a parallelogram.
  • the print grid or the individual print grid cells can also have the shape of a rhombus, a special form of the parallelogram.
  • the curved printing grid serves as a regular printing grid for the control of the print head.
  • the printhead for example, scans the image lines (X-axis) and gives the print medium to the object for each pixel, corresponding to the information stored in the raster cell (X, Yj) for the pixel.
  • reading the print original into the curved print raster makes it possible to improve the print result with relative movement of the print head to the object to be printed.
  • the print grid or the print grid cells each have the shape of a parallelogram or a rhombus.
  • a further embodiment of the invention therefore provides that the object to be printed or the surface to be printed not only moves along or about an axis relative to one or more print heads, that is, for example rotates, but that there is a composite multi-axis movement relative to Printhead completes.
  • the printhead can perform a multi-axis movement around the print object.
  • Compound multi-axis movements take place along and around single or multiple axes. They can also be referred to as superimposed movements. This means that this is not a purely translatory or a purely rotational movement, but in particular combinations of relative displacement and relative rotation during printing.
  • the term "printing" indicates the process during which the print head applies the print medium to the surface to be printed.
  • the object to be printed may be displaced along a first axis while simultaneously rotating about one or more axes of rotation.
  • the axis of rotation may coincide with the first axis of displacement.
  • the proposed method is also applicable to a 1-dimensional relative movement between printhead and object.
  • the movement of the object to be printed is a helical movement along and about an axis.
  • the object while it is being printed by the print head, is rotated in front of the print head and simultaneously moved along its axis of rotation.
  • the displacement movement relative for example, the printhead may be relatively up or down.
  • the helical motion splits the image into oblique stripes that are seamlessly or seamlessly joined together, allowing complete printing without interruption or repositioning of the object. This avoids the problem of repositioning the printhead when printing in sections and greatly improves stitching quality.
  • the print dot matrix corresponds to a parallelogram grid
  • the X-axis extends virtually helically around the object, whereby the print head is guided along a helical path relative to the object.
  • the print grid can be placed on the outside of the container / object where it extends helically around the container. The relative movement of the print head follows the print grid or is moved along the print grid and applies the print medium according to the information of the corresponding print grid cell.
  • the printing medium can be applied according to the invention in the multi-pass or single-pass method.
  • each line / screen cell or mesh to be printed is applied several times, with a pattern or image being built up in several steps. This means that the print medium for the print grid cell will be in several passes or steps applied.
  • multi-pass printing also allows for a print whose resolution is greater than the printhead's native resolution by adding more points between already set points.
  • the print image is printed in just one printing process without the print head having to retract the printing surface a second time.
  • Multi-color printing is a technique for creating color printed products.
  • the most common form of multi-color printing is four-color printing with the standardized primary colors cyan, magenta, yellow and black (CMYK), the process colors that are sprayed onto the object through the nozzles of the print head.
  • CMYK cyan, magenta, yellow and black
  • the 4 printing nozzles for the primary colors CMYK are particularly preferably activated simultaneously and therefore allow immediate curing after the application of the pressure.
  • a further embodiment of the invention provides that at least individual pressure points of the printed image are applied in several steps, wherein the distribution of the total amount of the pressure medium of the individual pressure points on the individual steps is randomized.
  • the determination of the amount of pressure medium to be applied for the pressure point can take place by means of a random generator.
  • an algorithm can be used which distributes the amount of print medium to the individual steps.
  • one or more of the printing nozzles can be used for printing the pressure cell to apply no pressure medium to the pressure point cell at all.
  • the distribution of the quantity of pressure medium controlled by random or algorithm to individual steps can basically be used for all printing processes in which pressure points are applied in several sub-steps.
  • the algorithm can be set up to take account of the failure of a pressure nozzle by no longer using this pressure nozzle and in each case compensating for the non-use of the other pressure nozzles to be used for the pressure of the pressure point. For this purpose, provided amount of pressure medium of the failed nozzle can be distributed to the other nozzles. This can increase the running times of machines up to maintenance.
  • a further embodiment of the invention provides that in a helical relative movement between a single-row printhead and the object, the length of the movement or the displacement along the rotation axis per revolution of Object (hereinafter slope) corresponds to the product resulting from the number of nozzles of the print head multiplied by the nozzle pitch.
  • the extent of the pressure nozzle arrangement is thus used as a pitch for the continuously applied pressure surface.
  • the print image grid is thus optimally adapted to the movement and the resolution of the print head. In this case, no area of the printing area is passed more than once by pressure nozzles (single-pass method).
  • the printed image always finds its approach after a revolution and the curved or parallelogram printed grid ensures an optimal image even in this multi-dimensional relative movement.
  • the curved printing screen is preferably formed from a rectangular printing grid by the rectangular printing screen is distorted into a parallelogram or a rhombus, the distortion with the n times the nozzle pitch.
  • printhead modules or printheads in the direction of travel of the printing surface, e.g. is guided in a helical motion relative to the printheads on the printheads, be mounted behind one another or side by side.
  • the printhead modules are each assigned a base color, in particular cyan, magenta and yellow and optionally black.
  • printhead modules with a special color may be added.
  • the pitch can also be reduced by a factor or a specified value, resulting in an overlap of the printed images after one revolution, the width of which results from the reduction of the pitch.
  • transitions between the jobs of different nozzles can be blurred.
  • an overlap may be used to blur a transition at a boundary between an upper and a lower nozzle application after a 360 ° rotation.
  • overlapping pressure points in the overlapping area can be distributed to the individual partial prints of the overlapping area according to an algorithm or by means of a random generator. The distribution of the ink amount in this stitching-like process does not follow a fixed pattern.
  • the movement or displacement of the object along the axis of rotation is in direct relation to the resolution of the printed image and the pressure nozzle density in the direction of displacement.
  • at least individual pressure points of the printed image are applied in several steps, wherein for a multipass, the pitch (axial offset per revolution) used for the helical movement corresponds to the number of nozzles multiplied by the nozzle pitch and divided by the number of steps.
  • a further embodiment of the invention provides that the relative speed with which the print head and the object move relative to one another move, changed or varied during printing.
  • the object during printing relative to the print head performs a helical movement and that the slope of the helical movement is varied during printing.
  • the length by which the object is displaced along its axis of rotation during printing during one revolution of the object may vary. This makes it possible to print complex-shaped objects and / or to print special images.
  • the variation of the slope it is possible, for example, to respond to variations in the outer diameter of a container, so that a uniform printed image results.
  • the resolution can be varied with the change of the slope.
  • the print image or a region of the print image can be applied in a higher resolution than the native resolution of the print head.
  • the pitch (axial offset per revolution) used in the printing of the helical motion area corresponds to the number of nozzles multiplied by the nozzle pitch and divided by the number of multiples of the native resolution.
  • the printhead (s) are oriented so that the nozzle assembly extends in a direction parallel to the relative axis of rotation.
  • the printing nozzles can be arranged one below the other, that is vertically. The vertical arrangement ejects the pressure medium filled in the print head by gravity at the lower nozzle at a higher pressure than at the upper nozzle. This usually results in other drop sizes, which are reflected in the color intensity.
  • offset printing approaches would be visible. If you print with several colors, the effect is clearer, because this applies to all colors.
  • the inventive driving the landing effect is avoided because on the one hand forms no horizontal line and because on the other hand in multi-color printing, each color can be applied to a different location.
  • the application of the color can be started at other locations on the object to be printed.
  • the printing nozzles of different colors particularly preferably of all colors, thus begin at spatially offset positions with the paint application.
  • the helical relative movement distributes the colors effectively and does not occur at the same point as when printing with lugs. This is particularly the case, for example, if the lowest nozzle of several print heads are each at the same height, in particular if the print heads are arranged in a ring around a cylindrical body.
  • the screw-shaped projections of the various colors do not run along the same line when the print heads start simultaneously, but are offset from one another.
  • the approach of each color is masked by 3 other colors because their approaches are located elsewhere.
  • the print start is therefore not for both printheads at a beginning of the print image on the object to be printed.
  • the print start of the second print head may be offset from the print start of the first print head by an angle with respect to an axis of rotation about which the object to be printed is rotated.
  • the second printhead prints the skipped beginning area of the print image only afterwards, whereby a 360 ° print is possible again. This is possible, for example, if the object to be printed is rotated further relative to the second print head, and the object to be printed is rotated by the second print head. head initially omitted initial area in front of the second printhead. In order to achieve that the print starts of the first print head and the second print head on the object to be printed are offset from one another, it is generally sufficient for the print copy read into the print screen to be modified only for the first print head or the second print head.
  • an initially non-printable area of the print original scanned into the print raster for the first print head and / or for the second print head or the second print head is cut off and attached to a previous end of the print original read into the print raster. This creates for the corresponding printhead again a continuous 360 ° image without jumping from the end at 360 ° to the beginning at 0 °.
  • the original printhead read in the printing grid for the second printhead in this example for the Magenta color, can be modified as follows: In the print original scanned into the print screen, an initial area is cut out for the second print head which corresponds to 0 ° to 90 ° of the print image to be applied with respect to the axis of rotation.
  • the modified original prints again from 0 ° to 360 °
  • the non-cut area is shifted by 90 ° to the beginning and on the other hand the cut-off area is attached to one end of the uncut area.
  • the previously cut-off starting area now forms a range of 270 ° to 360 ° of the print template for the second print head.
  • the information for the second printhead is cyclically shifted from the one for the first printhead by an angle of 90 °.
  • the print template for the second print head here for the color magenta
  • the first print head and the second print head are arranged at the same height with respect to the axis of rotation and yet at the same time begin to print the object.
  • the print start of the second print head (in the example cyan) for a better quality stitching is offset by 90 ° compared to the print start of the first print head (magenta in the example).
  • a print start of a third printhead may be offset by an angle from the print start of the second printhead.
  • this angle may be equal to the angle at which the print start of the second print head is offset from the print start of the first print head.
  • the read in the print grid artwork for the various printheads is modified so that the print starts of all printheads on the object to be printed each offset from each other.
  • the print start below the print image to be printed.
  • the first point is set.
  • the object is rotated about a rotation axis during printing and the direction of rotation is reversed during the printing process.
  • the printing area or individual area of the printing area can be printed with a higher resolution.
  • the object can be moved axially during printing along an axis, preferably the axis of rotation, and the direction of movement along the axis can be reversed during the printing process.
  • the reversal of the or rotation may be in the range of one or more printheads. This has a time-saving effect especially with multi-pass procedures.
  • a further embodiment of the invention provides for pinning and / or curing of the ink during the process of printing and / or after printing.
  • the printed image may be pinned and / or cured during or between or after the individual ink jobs.
  • the object may be cured by appropriate means. These include e.g. Radiation sources, such as a UV lamp, chemical agents, such as crosslinking or hardening components, or thermal sources to evaporate the liquid components. Even when curing, the object can rotate about a rotation axis, whereby the direction of rotation can be reversed during the curing process.
  • the invention also relates to a device for digital printing of 3-dimensional objects, in particular bottles, cans or other hollow bodies, which is adapted to perform one of the methods described herein.
  • a device according to the invention comprises a receptacle for the object to be printed, at least one drive device with which the receptacle is axially displaceable and rotatable in a direction of rotation about a rotation axis, at least two print heads and a controller for controlling the drive device and the print heads , The controller is adapted to shift the recording with the object placed thereon during printing in both the direction of translation and in the direction of rotation.
  • the receptacle may be a holder, in particular a turntable or the like, which guides the object in particular in a composite multi-axis movement.
  • at least two printheads are in the same height position in the direction of movement. They are thus in a plane and have no axial offset. However, they are arranged offset in the circumferential direction about the axis of rotation.
  • the at least two in-plane printheads begin simultaneously with the printing.
  • the oblique stripes which they imprint on the object to be printed during helical printing and which extend in a helical manner around the object to be imprinted are then not exactly on top of each other. Instead, they are offset from each other, even after a complete and several turns of the object to be printed.
  • the strip edges of a first oblique strip of a first printhead thus lie in the interior of at least one second oblique strip of a second printhead and are masked in this way.
  • the printed image is sharper and its quality is particularly good. In particular, it is less affected by irregularities in the shape of the object to be printed.
  • the device can be configured to control the multi-axis movement of the object in such a way that a surface to be printed can be printed by all print heads during the printing process.
  • the positions of the print heads in dependence on the axial offset per revolution can be selected so that the print heads can each begin at the same axial height of the object with the pressure.
  • FIG. 1 shows schematically the printing of a rotationally symmetrical container according to a first embodiment of the invention.
  • Fig. 2a-e schematically the rasterizing of a picture motif after another
  • FIG. 1 shows a rotationally symmetrical 3-dimensional object 1 to be printed in the form of a bottle.
  • the bottle 1 is received in a receptacle 2 in the form of a turntable, wherein the turntable 2 is rotatably driven about a rotation axis 3, so that the bottle 2 rotates about its axis of symmetry or central axis with the axis of rotation 3 in the longitudinal direction (here in vertical Direction) coincides.
  • the turntable 2 is part of a drive device 4 shown only schematically, which is displaceable in the height direction, ie along the axis of rotation 3 up and down, which is indicated by arrows 5.
  • a region 6 is marked, which extends over the outer circumference of the bottle 1 and which is to be printed with a printed image.
  • a print head 7 is arranged next to the bottle 1. With a), b) and c) different positions of the print head 7 in the height direction relative to the bottle 1 are marked. However, it is the same printhead at different stages of the printing process.
  • the print head 7 has a number of print nozzles 8 whose arrangement extends in the height direction (shift direction) along the extension B (effective print head width). Adjacent (immediately adjacent) nozzles of a parallel to the axis 3 extending nozzle row have a Distance T up.
  • the pressure nozzle row is aligned vertically and parallel to the axis 3.
  • the extent of the printing area 6 or of the printing area is greater in the axial direction (in the vertical direction) than the nozzle arrangement B.
  • the image to be printed is in digital form and is divided into pixels by means of software known from the prior art into a virtual grid of pixels , which consists of image columns and image lines.
  • the printing grid serves to control the printing nozzles. By droplet application ink is applied from the nozzles 8 according to the specifications of the print dot matrix in the form of pressure points on the bottle 1, so that the print motif is printed as a raster motif on the outside of the bottle 1.
  • the bottle 1 is held with the surface to be printed 6 at a small distance to the print head 7 and rotates about its central axis or about the rotation axis 3 along the direction of rotation R.
  • This rotational movement is paired with a displacement movement 5 along the axis of rotation 3 (here down), so that the print head 7 is displaced upwardly relative to the object 1.
  • It is thus a composite or superimposed multi-axis motion that combines an axial movement with a rotational movement.
  • the surface 6 to be printed moves helically past the print head 7. It is a relative movement in the form of a helical line.
  • the print head 7 is thereby moved relative to the bottle 1 from the position a) via the position b) to the position c).
  • the printing begins by the first (uppermost) nozzle 8 of the print head 7 at position a) setting the first pixel of the lowest row of the print dot matrix.
  • the following pressure points for the lower edge of the print dot matrix are printed by the uppermost nozzle 8 until the second highest nozzle reaches the lower edge of the print area. From this point on, the second nozzle also prints a helix line that is below that of the first nozzle is located. After a certain displacement of the print head, the lowest nozzle also enters the print area. From this point on, an oblique strip 10 is printed on the bottle, which extends helically around the bottle.
  • the oblique solid lines 9 in Figure 1 indicate the pressure profile of the applied by the print head 7 strip 10 on the front side 1 1 of the bottle first
  • the oblique strip 10 merges seamlessly into the strips printed during the previous revolution, resulting in a seamless and clean printed image.
  • the result is a continuous pressure of the outside of the bottle 1 helically surrounding pressure strip 10 with the width L in the axial direction, which corresponds to the extension B.
  • the print head 7 In position c), the print head 7 has almost left the print area, with the lowermost nozzle of the print head 7 applying the final droplets in accordance with the programming.
  • the method described above can also be carried out the other way round in the sense of the invention by the bottle being guided upward in the axial direction during printing. In this case, the printing starts at the upper edge of the area 6 to be printed.
  • Fig. 2a shows an analogue print motif (print original 12) .
  • This image motif is rasterized for screen printing
  • a virtual Cartesian raster 13 is placed over the image motif 13.
  • the raster 13 is in the form of an XY raster and is in individual
  • the color information of the print motif in the individual raster cells is read in and stored in the raster cells.
  • the print original is now in rastered form During printing, the print head moves virtually the print raster and prints the individual pixels the specifications that are stored in the grid for the individual pixels.
  • FIG. 2c shows, analogously to FIG. 2b, the scanning of the motif 12 from FIG. 2a into a printing raster 15.
  • the printing raster 15 is not a Cartesian grid with rectangular cells but a non-orthogonal two-dimensional raster in which the coordinate axes X, Y are not perpendicular to each other, but at an angle 16 are at an angle to each other.
  • the Cartesian raster 13 shown in FIG. 2b can be virtually pulled before the print motif is read in by shifting one of the X or Y axes. In the case shown, the axis Y was shifted by a distance 17. As a result, the entire grid was distorted in the manner of a parallel guide.
  • the formerly rectangular cells 14 of the grid now have the shape of a parallelogram.
  • the parallelogram 15 is large enough that it completely encloses the analog image when it is virtually overlaid. Similar to the Cartesian grid 13, the image area is defined by vertical grid lines (parallel to the Y axis) or oblique grid lines (parallel to the X axis) in image divided into rich columns and image area lines. Note the size of a pixel, which is 0.03 x 0.03 mm at 720 dpi. A horizontal line would therefore be just as staircase-shaped as an oblique line in the Cartesian grid. For this, the oblique line is printed in more detail in the parallelogram grid. The deviation, when a horizontal line is printed in the parallelogram grid, corresponds at most to the distance between 2 nozzles (in our example, 1/100 mm) and is not perceptible by the eye.
  • the parallelogram 15, which is placed over the print motif, with respect to the Cartesian grid 13 is arranged so that the Y grid lines of the parallelogram 15 parallel to the Y grid lines of the Cartesian grid 13, whereas the X grid lines of two grid 12, 15 are at an angle to each other.
  • the image subject is divided into individual parallelograms 14 (image area cells) due to the oblique (X) and vertical (Y) raster lines, and the corresponding color information is stored in the raster 15.
  • the image information in the print cells 14 at the raster positions (image column X, and image line Y j ) is read out and used to control the print head.
  • the parallelogram raster is processed like a Cartesian raster.
  • FIG. 2d shows the print result 18 (raster-like print image) when the parallelogram raster 15 is processed as a Cartesian raster, wherein the print head is moved parallel to the X-axis and a relative movement between the print head and the surface to be printed in the Y direction does not take place.
  • the printed print motif is sheared or obliquely printed.
  • FIG. 2 e shows the print result 19 (raster-like print image) of a combined rotation and displacement movement of the object 1 to be printed relative to the print head 7 when the parallelogram raster 15 from FIG. 2 c is used to control the print head 7.
  • the shift of the surface to be printed overlaps with the rotational movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ink Jet (AREA)

Abstract

L'invention concerne une impression numérique d'objets tridimensionnels (1), en particulier de bouteilles, de canettes ou d'autres corps creux, au moyen d'au moins une tête d'impression (7), l'objet destiné à être imprimé (1) se déplaçant afin d'être imprimé par rapport à la tête d'impression (7), une maquette d'impression (12) étant constituée d'une pluralité de points d'impression (14) et les points d'impression stockés dans une trame d'impression (15) constituée de colonnes d'image et de lignes d'image, la trame d'impression (15) étant conçu pour commander la tête d'impression (7) pendant le processus d'impression afin d'appliquer une présentation de l'impression à l'objet destiné à être imprimé (1). La trame d'impression (15) est incurvée et les lignes d'image et les colonnes d'image sont obliques les unes par rapport aux autres. La maquette d'impression (12) est traitée par lecture dans la trame d'impression (15) incurvée.
EP17717729.2A 2016-04-18 2017-04-18 Procédé et dispositif d'impression numérique d'objets tridimensionnels Active EP3445590B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016107087.4A DE102016107087A1 (de) 2016-04-18 2016-04-18 Verfahren und Vorrichtung zum digitalen Bedrucken von 3-dimensionalen Objekten
PCT/EP2017/059126 WO2017182439A1 (fr) 2016-04-18 2017-04-18 Procédé et dispositif d'impression numérique d'objets tridimensionnels

Publications (2)

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EP3445590A1 true EP3445590A1 (fr) 2019-02-27
EP3445590B1 EP3445590B1 (fr) 2021-04-07

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US (1) US20190092043A1 (fr)
EP (1) EP3445590B1 (fr)
DE (1) DE102016107087A1 (fr)
WO (1) WO2017182439A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN109572207B (zh) * 2018-10-31 2020-08-04 重庆宏劲印务有限责任公司 一种光油喷涂形式在瓶体上打印立体图案的装置和方法
IT201900008499A1 (it) 2019-06-10 2020-12-10 Nicola Cristiano Zonno Processo e sistema di produzione di oggetti decorati
AT522737B1 (de) * 2019-07-08 2021-07-15 Franz Neuhofer Verfahren zum digitalen Bedrucken einer Profilleiste
CN112123951B (zh) * 2020-09-30 2022-01-21 北京猎户星空科技有限公司 标签打印机构、打印方法、打印装置、控制器及存储介质
JP7116877B1 (ja) 2021-02-09 2022-08-12 株式会社トライテック 画像記録装置
DE102022108149A1 (de) * 2022-04-05 2023-10-05 Krones Aktiengesellschaft Verfahren zum Bedrucken eines Behälters und Vorrichtung zum Bedrucken eines Behälters
CN115871350B (zh) * 2022-12-13 2024-08-20 上海开仰实业有限公司 一种标签打印机打印头智能调节系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526769A1 (de) 1985-07-26 1987-01-29 Schmalbach Lubeca Verfahren zum dekorieren von behaeltern aus metall oder kunststoff
US5610649A (en) * 1993-04-26 1997-03-11 Fuji Photo Film Co., Ltd. Color thermal printing method
US6394577B1 (en) * 1999-08-19 2002-05-28 Eastman Kodak Company Ink jet printing on a receiver attached to a drum
US7111915B2 (en) * 2001-06-08 2006-09-26 Raul Martinez Methods and apparatus for image transfer
GB2376920A (en) * 2001-06-27 2002-12-31 Inca Digital Printers Ltd Inkjet printing on a three-dimensional object including relative movement of a printhead and the object during printing about a rotational axis
US7052125B2 (en) * 2003-08-28 2006-05-30 Lexmark International, Inc. Apparatus and method for ink-jet printing onto an intermediate drum in a helical pattern
DE202013004037U1 (de) * 2013-01-31 2013-06-26 Krones Ag Behälterausstattungsanlage
PL2860036T3 (pl) * 2013-10-09 2020-08-24 Hinterkopf Gmbh Urządzenie drukujące, maszyna drukarska i sposób eksploatacji urządzenia drukującego

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EP3445590B1 (fr) 2021-04-07
US20190092043A1 (en) 2019-03-28
DE102016107087A1 (de) 2017-10-19
WO2017182439A1 (fr) 2017-10-26

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