EP3040205B1 - Procédé et dispositif pour l'impression à jet d'encre sur des recipients - Google Patents

Procédé et dispositif pour l'impression à jet d'encre sur des recipients Download PDF

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Publication number
EP3040205B1
EP3040205B1 EP15194936.9A EP15194936A EP3040205B1 EP 3040205 B1 EP3040205 B1 EP 3040205B1 EP 15194936 A EP15194936 A EP 15194936A EP 3040205 B1 EP3040205 B1 EP 3040205B1
Authority
EP
European Patent Office
Prior art keywords
containers
printing
print
container
surface velocities
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.)
Active
Application number
EP15194936.9A
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German (de)
English (en)
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EP3040205A1 (fr
Inventor
Andreas Sonnauer
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.)
Krones AG
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Krones AG
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Publication date
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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
    • B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0082—Digital printing on bodies of particular shapes
    • B41M5/0088—Digital printing on bodies of particular shapes by ink-jet 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04526—Control methods or devices therefor, e.g. driver circuits, control circuits controlling trajectory
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • 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
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2217/00—Printing machines of special types or for particular purposes
    • B41P2217/50—Printing presses for particular purposes
    • B41P2217/60—Means for supporting the articles
    • B41P2217/62—Means for supporting the articles externally, e.g. for bottles

Definitions

  • the invention relates to a method and an apparatus for inkjet printing on containers.
  • a print advance of the surfaces to be printed with respect to at least one inkjet printing module is preferably generated in that the container is rotated around itself in the region of the printing module and / or is guided along a predetermined transport path along the printing module , It is then preferable to combine several partial prints on respectively assigned print heads or rows of nozzles after setting a suitable container rotation position and while maintaining a printing feed that is as constant as possible to form a print image in direct printing.
  • Glass bottles in particular have comparatively large dimensional and shape tolerances due to the manufacturing process.
  • the container wall When rotating glass bottles with a rotationally symmetrical nominal cross-section, the container wall then hits, for example due to their eccentricity, which has hitherto prevented commercial use of direct ink-jet printing on glass bottles.
  • the EP 2 756 956 A1 further discloses a method and an apparatus for printing a container rotated stationary on a turntable in front of a printhead by means of an inkjet.
  • the radial distance of the surface sections to be printed from the axis of rotation of the turntable is determined.
  • the distance of the surface to be printed is measured without contact during the rotation of the container from the area of the print head.
  • a web speed of the respective surface section is calculated from this and a pressure cycle of the ink jet nozzles used is compensated for.
  • pressure heads with several rows of nozzles are preferably used. Such nozzle rows or nozzle blocks have defined offsets to one another. If there is a deviation from a predetermined print feed speed, undesirable resolution distortions of the pixels and double prints occur.
  • a print advance in front of at least one printing module is generated at least by transporting the containers along at least one curved movement path, in particular by rotating around a carousel, either alone or together by rotating the containers around itself.
  • Surface speeds of lateral sections of the containers are measured during the rotation / transport.
  • an angular velocity of the rotation of the containers about itself becomes dependent set by the measured surface speeds and / or defined between the printing times of individual nozzles or nozzle rows of the printing module, which are assigned to different lateral sections and / or intermediate sections, the greater the smaller the associated surface speeds.
  • the latter correspond to actual pressure feeds of individual lateral sections of the containers with respect to the pressure module.
  • the measured surface speeds can be caused by superimposing a container rotation around itself with a transport movement of the containers, that is to say by rotating the containers about an axis of rotation which moves with respect to the pressure module, along a curved transport path. Carousels or other curved conveyor lines are suitable for this.
  • the measured surface speeds can be caused solely by revolving the containers on a carousel or moving along otherwise curved transport tracks.
  • the rotational position of the container is then adjusted by rotating around itself before the speed measurement according to the invention.
  • the containers can run along the printing module on a carousel or similar transport means and also to be rotated about themselves during printing.
  • the pressure feed then results from the superimposition of the transport movement and the container rotation around itself.
  • the surface speed measured according to the invention is representative of the actual pressure feed of the respectively scanned lateral section of the container surface.
  • the lateral sections are, for example, partially circumferential sections of a side wall to be printed and / or representative of the circumferential line thereof.
  • the lateral sections can adjoin one another directly, for example when the surface is continuously scanned along the circumference of the container.
  • the lateral sections can be spaced from one another, in the sense of a grid of measuring points running along the circumference of the container. For lateral sections between the measuring points of the grid, printing times and associated time intervals can be calculated, for example, by interpolating measured values.
  • the lateral container surface is preferably scanned from a position that is stationary with respect to the printing module.
  • angular speed i.e. the speed of rotation of the containers around itself
  • deviations of the actual pressure feed of individual lateral and / or intermediate sections of the container with respect to at least one pressure head and / or with respect to a row of nozzles aligned in particular transverse to the feed direction can also be deviated from a target -Compensate the print feed in order to generate the most uniform print resolution possible in the feed direction.
  • the angular velocity / rotational speed is readjusted in the case of a measured deviation from a target value of the angular velocity / rotational speed and thus the printing feed in order to keep the deviation within a permissible tolerance range.
  • sequences of the angular velocity / rotational speed for a full or partial circumference of the container around itself can be created and, if necessary, stored in order to reproducibly change the angular velocity / rotational speed in front of different printheads in such a way that an essentially constant pressure advance of the surface to be printed is in front of it results.
  • the individual container or container type can then be assigned an individual sequence of the rotational speed which the container maintains on its way through the device according to the invention, for example through a plurality of carousels, for the individual printing modules or pre-treatment modules.
  • the smaller the associated surface speeds, the greater the time intervals which are assigned to different lateral sections and / or sections lying between them. Adjusting the printing times is therefore to be understood to mean that, for lateral sections with a comparatively high surface speed, print commands are given for a print head, for a row of nozzles oriented transversely to the feed direction and / or for a single nozzle with comparatively short time intervals, and for lateral sections with a comparatively low surface speed, on the other hand, at larger time intervals.
  • an actual pressure advance of the container surface that is at different speeds along the circumference of the container can be compensated in order to place ink drops on it with distances that are as uniform as possible in the direction of advance.
  • the time intervals between printing times of individual nozzles and / or rows of nozzles of the printing module are preferably defined, in particular between immediately following printing times.
  • the adjusted time intervals are assigned to the lateral sections of the container surface and can therefore be applied to nozzles and / or rows of nozzles of different print heads or print modules in order to adapt the output of ink to the respective actual print feed.
  • Unwanted print artifacts at the transition between partial prints made with different nozzle rows, print heads and / or print modules, for example an overlapping print or connection gaps, can thus be suppressed.
  • the surface speeds are preferably measured while the print feed is running, in particular during inkjet printing. This means that the movement responsible for the print feed is not interrupted from measuring the surface speeds to the associated printing process.
  • the rotational position of the container then does not necessarily have to be determined for the adaptation of the printing times according to the invention. Instead, the printing times can essentially be adapted on-the-fly, for example when rotating at a constant angular speed and taking into account a time offset until the respective nozzles or row of nozzles are reached. This is particularly advantageous in the case of glass bottles, in which the focus is on individual dimensional and shape tolerances, so that printing times for each bottle have to be corrected individually.
  • the surface speeds during rotation and / or transport are preferably measured at a known angular speed.
  • the known angular velocity is preferably constant, but can also be varied if the measured surface velocity can be assigned to the angular velocity used.
  • the angular velocity can also be readjusted or controlled in order to reduce or compensate for a deviation of the measured actual pressure feed from a target pressure feed. This is preferably done on-the-fly or in the form of a previously stored sequence of the angular velocity.
  • the known angular speed can be overlaid by a transport speed that is also known in particular, for example along a linear conveyor section.
  • measured surface speeds of the container are assigned to the measured rotational positions. Measured values can be, for example save them together and use them for the calculation of adapted printing times and / or adapted processes of the angular velocity also for later printing processes.
  • the fluctuations in the surface speed of individual lateral sections, which are caused by eccentrically held and / or not rotationally symmetrical container cross sections, can in principle also be measured and stored in a preceding process step. Time intervals between printing times and / or angular speeds assigned to individual rotational positions of the container can then be used repeatedly for any number of printing processes of the same lateral sections. This is advantageous in the case of molded bottles made of plastic, the deviation of which from a rotationally symmetrical cross section is predetermined, and which have low individual dimensional and shape tolerances in comparison to glass bottles.
  • the surface speeds are preferably measured with a friction wheel rolling laterally on the container, a functionally equivalent roller or the like.
  • a friction wheel rolling laterally on the container, a functionally equivalent roller or the like.
  • a rotary encoder for a precise digital speed measurement is coupled to it.
  • the friction wheel can be adjusted, for example, in the vertical direction in order to scan the side wall of the container at a height level representative of the wall contour to be printed.
  • the friction wheel then rolls on the container, preferably in full. Friction wheels are particularly suitable for bottles with a rotationally symmetrical nominal cross section.
  • the surface speeds can be measured in a contactless manner by optical scanning of the lateral sections and / or by their acoustic scanning using ultrasound. This is particularly advantageous in the case of high relative speeds between the surface of the container to be measured and the measuring device and / or a short residence time of the container in the area of the measuring device / pressure module.
  • the printing times and / or the angular velocity are preferably also adapted to printing distances to the lateral sections of the containers and / or to sections lying between them. This makes it possible to compensate for differences in the running time of individual ink drops from the nozzles to the sections of the container surface to be printed.
  • the containers are preferably glass bottles, in particular those with a rotationally symmetrical predetermined cross section, or shaped bottles, in particular those made of plastic. Due to the manufacturing process, glass bottles have particularly high dimensional and shape tolerances, particularly with regard to their outer circumference and their eccentricity towards the bottle mouth. Compensation of different actual pressure feeds of individual side wall sections by adapting the The associated printing times are therefore particularly important for glass bottles or even a prerequisite for qualitatively acceptable direct printing using an inkjet.
  • this is used for inkjet printing on containers and comprises: at least one printing module; a carousel with circumferential positioning units for holding and rotating the containers around themselves; at least one measuring device for determining surface speeds of lateral sections of the rotating containers; and a control device for actuating the printing module by adapting the time intervals between printing times of individual nozzles or nozzle rows of the printing module as a function of the measured surface speeds, the time intervals being assigned to the different lateral sections and / or intermediate sections, the larger the smaller the associated surface speeds are.
  • Carousels assigned to a certain partial printing step or treatment step can be inserted in a modular manner depending on the required colors and / or processing steps in a serial sequence of carousels or can be removed therefrom.
  • the sequence of carousels could be supplemented by inlet modules and outlet modules.
  • the containers could also be used for printing in slaves or other transportation / positioning aids.
  • the measurement of the surface speed according to the invention can be used specifically for the correction of printing times and / or the adaptation of the angular speed / rotational speed of the containers for printing on individual circumferential partial areas with a specific print head.
  • Printheads and units for hardening the print could also be formed in a common horizontal plane, in particular in a star shape, around a positioning unit for holding and rotating a container about itself.
  • the measurement of the surface speed according to the invention can then be used for the correction of printing times on the print head or the like which is just facing the measured surface.
  • the adaptation of printing times / rotational speeds according to the invention could be used on printing modules in which the printing heads are arranged one above the other, that is to say the containers for the partial printing change / print head change are moved along their longitudinal axis and are preferably printed on in different horizontal planes.
  • the measuring device preferably comprises a friction wheel with a rotary value transmitter, the friction wheel being spring-loaded in the direction of the container to be scanned.
  • the friction wheel can be easily coupled directly to the printing module.
  • the print head and the friction wheel are preferably mounted so that they can move together in the direction of the container.
  • the friction wheel rolls off the container there is then a constant pressure distance between the container surface and the nozzles / nozzle rows of the pressure module.
  • the friction wheel then acts as a control role for the nozzles / rows of nozzles.
  • the container surface then acts as a corresponding control curve.
  • the measuring device preferably operates in a contactless manner on the basis of an optical and / or acoustic scanning beam.
  • the scanning is thus carried out, for example, using laser light or ultrasound.
  • Optical code readers, line scanners, cameras or the like are suitable for optical scanning.
  • the Fig. 1 shows schematically a speed measurement on a container 1 indicated in the top view, which is rotated around itself about an axis of rotation 2a of a positioning unit 2 at an angular speed 3. Because of an eccentric location and / or In the form of a lateral surface 4 of the container 1 with respect to the axis of rotation 2a, circumferential sections A1-A3 of the lateral surface 4, which are designated by way of example, run along paths B1-B3 with different surface speeds V1-V3. This is in the Fig. 1 schematically indicated by block arrows of different sizes. Associated rotational positions ⁇ 1 - ⁇ 3 of the container 1 are marked on the positioning unit 2.
  • the different surface velocities V1 - V3 are caused by the radial distances of the side sections A1 - A3 from the axis of rotation 2a.
  • the lateral section A1 has the smallest radial distance from the axis of rotation 2a and the lateral section A3 has the largest radial distance.
  • Different radial distances between the side wall areas occur for production reasons, for example on glass bottles that are clamped at their mouths centered with respect to the axis of rotation 2a.
  • a measuring device 5 which in the example shown works contactlessly by means of a schematically indicated scanning beam 5a, which is, for example, a laser beam or ultrasound beam
  • the distribution of the local surface speed V along a circumferential line of the surface 4 is preferably measured in full with the container 1 continuously rotating .
  • the surface speeds V1-V3 of the partially circumferential sections A1-A3 are shown as examples.
  • the local resolution of the speed measurement can be adapted to the requirements of inkjet printing.
  • a section A6 lying between the lateral sections A2 and A3 is indicated, the surface speed of which could be measured as well as calculated by interpolation of measured values, for example the surface speeds V2 and V3, or in some other way.
  • the course of the local surface speed V of the scanned lateral surface 4 is a function of the rotational position ⁇ when rotating about the axis of rotation 2a (exaggerated for better understanding) in FIG Fig. 1 shown below.
  • the local surface velocities V measured between the rotational positions ⁇ 1- ⁇ 3 and the associated partially circumferential sections A1-A3 are shown as a solid line. The further course is indicated by dashed lines.
  • FIG. 1 shows the chronological sequence of printing times 6 for individual partially circumferential sections of the lateral surface 4 to the respective local surface speed V. That is to say, in order to print the partially circumferential sections A1-A3 shown by way of example, the length of the time intervals I1-I3 between individual printing times 6 of a specific nozzle or a row of nozzles oriented transversely to the printing direction is adapted to the associated surface speeds V1-V3.
  • the adaptation of the printing times 6 according to the invention is shown in FIG Fig. 1 schematically indicated along a linear time axis over the associated lateral sections A1, A2 and A3.
  • the longest time intervals I1 between print commands to a specific nozzle or row of nozzles are used to print the partial circumference section A1 with the lowest surface speed V1, and conversely the shortest time intervals I3 between individual print commands to the same nozzle or nozzle row to print on the partially circumferential section A3 with the greatest surface speed V3.
  • the time intervals between the print commands for individual nozzles or rows of nozzles of a print head thus become shorter, the faster the partially circumferential section of the lateral surface 4 to be printed moves in the direction of advance.
  • a common starting point for the adaptation of the printing times 6 according to the invention can be a time interval between individual printing times, which is typical for the performance of the print head used.
  • the Fig. 2 shows a non-inventive speed measurement by means of a measuring device 7 comprising a friction wheel 7a that rolls on the side surface 4 of the container 1. Both the lateral surface 4 and the running surface of the friction wheel 7a then move at the local surface speed V in the sense of a printing feed with respect to a printing module 8.
  • the measuring device 7 comprises, for example, a rotary encoder which transmits measurement data DV relating to the local surface speed V on the friction wheel 7a Control unit 9 or the like transmitted.
  • the latter further serves to control the print module 8, which comprises at least one schematically indicated print head 8a, with print commands CD for dispensing ink at the printing times 6.
  • An embodiment 10 of the device according to the invention comprises at least one stationary printing station 11 with the positioning unit 2, the measuring device 7, the printing module 8 and the control unit 9 and also a conveyor belt 12 or the like, from which the container 1 to be printed is cyclically transferred to the printing station 11 become.
  • the containers 1 are centered, for example, at their mouths 1a by means of centering bells (not shown) or the like with respect to the axis of rotation 2a of the positioning unit 2.
  • centering bells not shown
  • printing with measurement of the surface speed V is possible with continuous transport of the containers 1, for example at rotating printing stations 11.
  • the positioning unit 2 with the respective container 1 along the printing station 11, for example along a linear transport path in the Essentially corresponding to the conveyor belt 12.
  • the surface speed V can be scanned with the measuring device 7 in a rolling or contactless manner.
  • the containers 1 can have eccentric or other circumferential lines U1 - U4 and / or circumferential lines U5, U6 with respect to their mouth 1a, and / or circumferential lines U5, U6, which vary to an extent relevant to the pressure feed due to dimensional tolerances. In the Fig. 2 this is exaggerated for better understanding.
  • the adaptation of the printing times 6 and / or the angular velocity 3 improves, for example, the direct printing on surfaces 4 with an essentially circular and eccentric circumferential line U1, partially circumferentially flattened circular circumferential line U2, elliptical circumferential line U3, irregularly running circumferential line U4 and / or circumferential lines U5, U6 with a extent deviating from a target value upwards or downwards.
  • the friction wheel 7a is preferably resiliently biased in the direction of the lateral surface 4 to be scanned.
  • An associated pressure force 7b is schematically indicated by an arrow.
  • the friction wheel 7a thereby remains in frictional contact with the side surface 4 to be scanned.
  • the friction wheel 7a is mounted telescopically in the direction of the side surface 4. It would also be conceivable to mount the friction wheel 7a on a resiliently pretensioned lever or the like.
  • the print module 8 and / or the print head 8a can be mounted in a position fixed with respect to the axis of rotation 2a or a specific value or maintain the area of the printing distance to surface 4.
  • the print head 8a of the scanned lateral surface 4 could be moved towards or away from the axis of rotation 2a.
  • the print head 8a would, for example, be slidably mounted on a linear unit (not shown). The adjustment could take place both with the help of an electric motor provided on the linear unit and also by mechanical coupling of the print head 8a or a comparable row of nozzles to the friction wheel 7a.
  • the friction wheel 7a and the lateral surface 4 would then work together in the sense of a control roller and a control cam in order to adjust the print head 8a following the surface 4 and to maintain a constant printing distance.
  • FIG. 1 Examples of partially encircled sections A1-A3 can be scanned in a functionally corresponding manner with the friction wheel 7a in order to measure the associated local surface speeds V1-V3 or generally the course of the local surface speed V and the printing times 6 and / or the angular speed 3 for each the corresponding partially circumferential sections A1 - A3 and A6, as described above.
  • the measurement of the local surface speed V and the adaptation of the printing times 6 and / or the angular speed 3 can be carried out with the help of the control unit 9 or similar units during printing operation (on the fly). Adjusted printing times 6 can then be used in succession with continuous rotation of the container 1 also for printing processes on further print heads 8a, for example for multi-color printing. Partial prints can then be produced with individual print heads 8a with uniform print resolution and / or can be strung together seamlessly. Such partial prints contain, for example, different color components of a color model or complementary image sections of a printed image. Adjusted sequences of the angular velocity 3 are particularly suitable for modular stations, on which only one color component is printed on or only a certain treatment step is carried out.
  • correct offsets between interacting nozzle rows or nozzle blocks can be maintained by the stabilization of the printing feed according to the invention.
  • the extensive distribution of the local surface speed V is typical for the measured container 1 or, depending on the manufacturing tolerance, for a specific container type and with a known angular speed 3 of the container rotation only dependent on the rotational position ⁇ of the positioning unit 2 and the container 1.
  • the rotational position ⁇ can, in principle, be used for printing times 6 adapted according to the invention for any printing heads 8a present in the area of the positioning unit 2.
  • the print times 6 adapted for a specific print head could alternatively be adopted for further print heads in the area of the positioning unit 2, in that the adjusted print times 6 are each delayed by a time offset assigned to the relevant further print head.
  • the measurement data can also be transferred into a coordinate system, for example into a polar coordinate system, and converted for different target pressure feeds and / or sequences of the rotational speed / angular speed 3.
  • the Fig. 3 shows a preferred embodiment 20 of the device according to the invention, in which the containers 21, which are preferably formed as molded bottles made of plastic or the like, each run continuously by a positioning unit 2 on a carousel 22.
  • the carousel 22 rotates at a known, in particular constant, angular velocity 23.
  • Partially circumferential sections A4, A5 of a lateral surface 24 of the containers 21 are successively printed directly on printing modules 28, which are preferably stationarily mounted on the periphery of the carousel 22, from a plurality of nozzle rows 28a and / or printing heads oriented transversely to the feed direction.
  • the printing modules 28 are preferably used to apply partial prints, for example individual colors or image sections of a printed image.
  • each contactless scanning device 5 for measuring the local surface speed V.
  • the lateral sections A4, A5 run along the movement paths B4, B5 with the carousel 22 and have different surface speeds V4, V5 due to different radial distances from the axis of rotation 22a of the carousel 22. This is in the Fig. 3 Again, for better understanding, indicated by different sized block arrows. Here, too, the different surface speeds V4, V5 cause different print feeds of the lateral sections A4, A5 in front of the printing modules 28.
  • the containers 21 can additionally in front of the printing modules 28 with the angular velocity: 30 are rotated around themselves so that the pressure feed from the transport movement and the rotary movement of the containers 21 overlap. In this case in particular, different surface speeds and printing feeds of individual lateral sections A4, A5 occur.
  • print feeds can be compensated according to the invention by actuating the nozzle rows 28a or functionally comparable print heads with print commands CD for ejecting ink drops at adapted printing times 6 in order to produce a uniform print resolution in the feed direction.
  • the time intervals between the printing times 6 of individual nozzles or rows of nozzles for printing on partial sections of the lateral surface 24 are set the shorter, the higher their measured / calculated local surface speed V is.
  • the course of the angular velocity 3 can be used to stabilize the printing feed, see first embodiment.
  • a control unit 29 is provided for evaluating measurement data DV from the measuring device 5, which also issues print commands CD to the nozzle rows 28a of the print modules 28.
  • the containers 21 are not rotated around themselves during the printing process, that is to say in the area of the printing modules 28. Instead, the rotational position ⁇ of the containers 21 is set before the pressure modules 28 are reached by means of a rotational position positioning 30 triggered by the control unit 29 by means of the positioning units 2.
  • containers 1 with a rotationally symmetrical target cross section could also be printed directly.
  • the local surface velocities V of individual partially circumferential sections of the lateral surface 4 could then, for example, be superimposed by rotating the containers 1 around themselves (at the angular velocity 3 about the axis of rotation 2a of the positioning units 2). and a rotation of the containers 1 on the carousel 22 (at the angular velocity 23 about the axis of rotation 22a).
  • the local surface speeds V for lateral container surfaces 4, 24 can be measure with the measuring device 5, 7 according to the invention and use it to adapt the printing times 6.
  • a pressure distance which varies due to the container cross section can be taken into account by an additional time offset of the printing times 6 by compensating for transit time differences of individual ink drops up to the respective partially circumferential section A1-A5 of the lateral container surface 4, 24.
  • the lateral surfaces 4, 24 can be scanned continuously by means of the friction wheel 7a as well as without contact using the scanning beam 5a, for example in the form of laser light or ultrasound waves.
  • the local surface speed V could also be measured in an imaging manner, for example by means of a camera and digital image evaluation (not shown).
  • the described embodiments 10, 20 can be combined as desired in a technically sensible manner.
  • rotary movements of the containers 1, 21 around themselves and transport movements along curved paths can be combined almost arbitrarily, in particular when the printing times are adjusted in real time / on-the-fly according to the invention.
  • the adaptation of printing times according to the invention can be used regardless of how individual nozzles, rows of nozzles 28a or print heads 8a are distributed over printing modules 8, 28.
  • a plurality of combined printing heads, nozzle rows and / or nozzle blocks, for example with printing widths over 70 mm, can either be controlled individually or together.
  • Stabilization of the printing feed according to the invention is possible both by adapting the intervals I1-I3 between individual printing times 6, in the sense of a printing frequency, and by adapting and / or readjusting the angular velocity 3 / rotational speed of the containers around itself.

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

Claims (12)

  1. Procédé pour l'impression par jet d'encre sur des contenants (1, 21), d'après lequel on produit une avance d'impression par rapport à au moins un module d'impression (8, 28) au moins par le transport des contenants (1, 21) le long d'au moins une voie de transport courbe (B4, B5), soit uniquement ainsi soit en commun par rotation des contenants (1, 21) autour d'eux-mêmes, procédé
    d'après lequel on mesure des vitesses superficielles (V1-V5) de tronçons latéraux (A1 - A5) des contenants (1, 21) pendant la rotation/le transport, et
    d'après lequel on règle une vitesse angulaire (3) de la rotation en fonction des vitesses superficielles (V1 - V5) mesurées, et/ou d'après lequel des intervalles de temps (l1 - l3) définis entre des instants d'impression (6) de buses individuelles ou rangées de buses (28a) du module d'impression (8, 28), qui sont associés à des tronçons latéraux (A1 - A3) différents et/ou des tronçons (A6) situés entre eux, sont réglés d'autant plus grands que les vitesses superficielles (V1 - V3) associées sont plus petites.
  2. Procédé selon la revendication 1, d'après lequel les vitesses superficielles (V1 - V5) sont mesurées pour une avance d'impression en cours.
  3. Procédé selon l'une au moins des revendications précédentes, d'après lequel les vitesses superficielles (V1 - V5) sont mesurées au cours de la rotation/du transport avec une vitesses angulaire (3, 23) connue.
  4. Procédé selon l'une au moins des revendications précédentes, d'après lequel on associe aux vitesses superficielles (V1 - V3), des positions de rotation (α1 - α3) du contenant (1).
  5. Procédé selon l'une au moins des revendications précédentes, d'après lequel les vitesses superficielles (V1 - V3) sont mesurées à l'aide d'une bande de friction (7a) ou similaire roulant latéralement sur le contenant (1) .
  6. Procédé selon l'une au moins des revendications précédentes, d'après lequel les vitesses superficielles (V1 - V5) sont mesurées sans contact, par exploration optique et/ou acoustique des tronçons latéraux (A1 - A5).
  7. Procédé selon l'une au moins des revendications précédentes, d'après lequel les instants d'impression (6) et/ou la vitesse angulaire (3) sont adaptés à des distances d'impression aux tronçons latéraux (A1 - A5) des contenants (1, 21) et/ou à des tronçons (A6) situés entre eux, associées.
  8. Procédé selon l'une au moins des revendications précédentes, d'après lequel les contenants (1) sont des bouteilles de gaz, notamment de telles bouteilles présentant une section transversale de consigne à symétrie de rotation, ou des bouteilles de forme, notamment en matière plastique.
  9. Installation (20) pour assurer l'impression par jet d'encre sur des contenants (21), comprenant :
    - au moins un module d'impression (28) ;
    - un carrousel (22) sur lequel sont en révolution des unités de positionnement (2) destinées au maintien et à la rotation des contenants (21) autour d'eux-mêmes ;
    - au moins un dispositif de mesure (5, 7) pour la détermination de vitesses superficielles (V24, V25) de tronçons latéraux (A4, A5) des contenants (21) en révolution ; et
    - un dispositif de commande (29) pour commander le module d'impression (28) en adaptant des intervalles de temps entre des instants d'impression (6) de buses individuelles ou rangées de buses (28a) du module d'impression (28), en fonction des vitesses superficielles (V4, V5) mesurées,
    installation dans laquelle les intervalles de temps (11 - 13), qui sont associés à des tronçons latéraux (A1 - A3) différents et/ou à des tronçons (A6) situés entre eux, sont réglés d'autant plus grands que les vitesses superficielles (V1 - V3) associées sont plus petites.
  10. Installation selon la revendication 9, dans laquelle le dispositif de mesure (7) comprend une roue de friction (7a) avec capteur de valeur de rotation, et dans laquelle la roue de friction (7a) est précontrainte de manière élastique en direction du contenant (1) à explorer.
  11. Installation selon la revendication 10, dans laquelle au moins une tête d'impression (8a) disponible sur le module d'impression (8), est montée de manière à être mobile en commun avec la roue de friction (7a) en direction du contenant (1).
  12. Installation selon la revendication 9, dans laquelle le dispositif de mesure (5) travaille sans contact, sur la base d'un rayonnement d'exploration (5a) optique et/ou acoustique.
EP15194936.9A 2014-12-09 2015-11-17 Procédé et dispositif pour l'impression à jet d'encre sur des recipients Active EP3040205B1 (fr)

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DE102014225256.3A DE102014225256A1 (de) 2014-12-09 2014-12-09 Verfahren und Vorrichtung für den Tintenstrahldruck auf Behälter

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CN106585151B (zh) * 2016-12-19 2018-10-30 攀钢集团攀枝花钢钒有限公司 一种用热连轧喷标机喷涂钢卷的方法
DE102016226166A1 (de) * 2016-12-23 2018-06-28 Krones Ag Verfahren und Direktdruckmaschine zur Bedruckung von Behältern aus unterschiedlichen Materialtypen im Direktdruck
GB2563979B (en) * 2017-04-24 2020-06-03 Pad Print Machinery Of Vermont Inc Independent print datum detection
WO2019060396A1 (fr) 2017-09-19 2019-03-28 Ball Corporation Appareil et procédé de décoration de contenant
CN110293777B (zh) * 2018-03-22 2021-04-09 海德堡印刷机械股份公司 用于补偿印刷滚筒中的干扰力矩的方法
DE102018007336A1 (de) * 2018-09-04 2020-03-05 Jörg R. Bauer 3D-Bauteil mit einem auf einer Oberfläche verzerrungsfreien, übergehenden Dekor.
CN109572216B (zh) * 2018-12-24 2020-01-03 北京美科艺数码科技发展有限公司 一种喷墨打印机打印方法
CN113905889B (zh) * 2019-06-14 2023-05-23 北京美科艺数码科技发展有限公司 一种喷墨打印机及一遍式喷墨打印方法
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Publication number Publication date
CN105691021B (zh) 2018-12-11
EP3040205A1 (fr) 2016-07-06
US20160159087A1 (en) 2016-06-09
CN105691021A (zh) 2016-06-22
US9878533B2 (en) 2018-01-30
DE102014225256A1 (de) 2016-06-09

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