EP3040205A1 - 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
EP3040205A1
EP3040205A1 EP15194936.9A EP15194936A EP3040205A1 EP 3040205 A1 EP3040205 A1 EP 3040205A1 EP 15194936 A EP15194936 A EP 15194936A EP 3040205 A1 EP3040205 A1 EP 3040205A1
Authority
EP
European Patent Office
Prior art keywords
printing
container
containers
measured
printing module
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
EP15194936.9A
Other languages
German (de)
English (en)
Other versions
EP3040205B1 (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
Original Assignee
Krones AG
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 Krones AG filed Critical Krones AG
Publication of EP3040205A1 publication Critical patent/EP3040205A1/fr
Application granted granted Critical
Publication of EP3040205B1 publication Critical patent/EP3040205B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 apparatus for ink jet printing on containers.
  • a pressure feed of the surfaces to be printed with respect to at least one ink jet printing module is preferably produced by rotating the container about itself in the area of the printing module and / or along a predetermined transport path along the printing module , There are then preferably combined a plurality of partial imprints on respectively associated printheads or rows of nozzles after setting a suitable container rotational position and adhering to the most constant possible pressure feed to a printed image in direct printing.
  • glass bottles have due to the manufacturing process comparatively large dimensional and shape tolerances.
  • nozzle rows or nozzle blocks have defined offsets to each other. If there is a deviation from a predetermined printing feed speed, undesired resolution distortions of the pixels and double prints occur.
  • this is the ink jet printing on container, wherein a pressure feed before at least one printing module at least by rotation of the container is generated around itself and / or by transporting the container along at least one curved trajectory, in particular by circulating on a carousel.
  • Surface velocities of lateral sections of the containers during rotation and / or transport are measured.
  • time intervals between printing instants of the printing module and / or an angular velocity of the rotation of the containers about themselves in dependence on the measured surface speeds are set. The latter then correspond to actual pressure feeds of individual lateral sections of the containers with respect to the printing module.
  • the measured surface velocities can be caused by rotation of the containers about themselves, ie by rotation about a rotation axis stationary with respect to the printing module, or by superimposing the container rotation on itself with a transport movement of the containers, ie by rotation of the containers about an axis of rotation moves with respect to the printing module, for example along a linear transport path or along a curved transport path.
  • both linear conveyor as well as carousels or otherwise curved conveyor lines are suitable.
  • the measured surface velocities may be caused solely by circulating the containers on a carousel or moving along otherwise curved transport paths.
  • the rotational position of the container is then adjusted by rotation about itself before the speed measurement according to the invention.
  • the containers it is possible for the containers to run on a carousel or similar means of transport along the printing module and, during the printing, also to be rotated about themselves.
  • the print feed then results from superposition of the transport movement and the container rotation about itself.
  • the surface velocity measured according to the invention is representative of the actual printing feed of the respectively scanned lateral portion of the container surface.
  • the lateral sections are for example teilumflindliche sections of a side wall to be printed and / or representative of the circumferential line.
  • the side portions may be immediately adjacent to each other, for example, with continuous scanning of the surface along the container periphery.
  • the lateral sections may have distances from one another, in the sense of a measuring point raster running along the container circumference. For lateral sections between the measuring points of the grid, printing times and associated time intervals can be calculated, for example, by interpolation of measured values.
  • the lateral container surface is preferably scanned from a relative position of the printing module.
  • deviations of the actual pressure feed of individual lateral and / or intermediate sections of the container with respect to at least one print head and / or with respect to a nozzle row oriented in particular transversely to the feed direction can also be determined Compensate for printing feed in order to produce the most uniform print resolution in the feed direction.
  • the angular velocity / rotational velocity is readjusted at a measured deviation from a target value of the angular velocity / rotational velocity and thus the pressure feed, in order to keep the deviation within a permissible tolerance range.
  • sequences of the angular velocity / rotational speed for a full or teilumflindliche rotation of the container to create itself and optionally save to the angular velocity / rotational speed reproducible To change before different printheads so that before each results in a substantially constant pressure feed of the surface to be printed.
  • the smaller the associated surface velocities the larger the time intervals allocated to different lateral sections and / or intermediate sections are set.
  • the adaptation of the printing times is thus to be understood as meaning that for lateral sections with comparatively high surface speed printing commands are given for a print head, for a nozzle row oriented transversely to the feed direction and / or for a single nozzle with comparatively short time intervals, and for lateral sections with comparatively low surface speed contrast, at greater intervals.
  • the time intervals between printing times of individual nozzles and / or rows of nozzles of the printing module are defined, in particular between immediately successive printing times.
  • the adjusted time intervals are associated with the lateral portions of the container surface and thus can be applied to nozzles and / or nozzle rows of different printheads or print modules to adjust the output of ink to the respective actual print feed.
  • Unwanted printing artifacts at the transition between partial nozzles produced with different rows of nozzles, printheads and / or printing modules, for example an overlapping imprint or connecting gaps, can thus be suppressed.
  • the surface speeds are measured while the print feed is in progress, especially during inkjet printing.
  • the movement responsible for the printing feed is not interrupted from measuring the surface speeds to the associated printing operation.
  • the rotational position of the container then does not necessarily have to be determined for the adaptation according to the invention of the printing times become.
  • the printing times may be adjusted substantially on-the-fly, for example, when rotating at a constant angular velocity and taking into account a time offset until reaching the respective nozzle or nozzle row. This is particularly advantageous in glass bottles, in which individual dimensional and shape tolerances are in the foreground, so that printing times for each bottle are to be corrected individually.
  • the surface speeds are measured during rotation and / or transport at a known angular velocity.
  • the known angular velocity is preferably constant, but may also be varied, as long as the measured surface velocity can be assigned to the angular velocity used.
  • the angular velocity may also be readjusted or controlled to reduce or compensate for a deviation of the measured actual pressure feed from a desired pressure feed. This is preferably done on-the-fly or in the form of a previously stored expiration of the angular velocity.
  • the known angular velocity can be superimposed by a particularly well-known transport speed, for example along a linear conveyor section.
  • measured surface velocities are respectively assigned to measured rotational positions of the container.
  • measured values can be stored together and used for the calculation of adapted printing times and / or adapted courses of the angular velocity also for later printing processes.
  • the fluctuations in the surface speed of individual lateral sections caused by eccentrically held and / or non-rotationally symmetrical container cross sections could, in principle, also be measured and stored in an upstream process step.
  • Individual rotational positions of the container associated time intervals between printing times and / or angular velocities can then be used repeatedly for any number of printing operations of the same lateral sections. This is advantageous in the case of molded plastic bottles whose deviation from a rotationally symmetrical cross section is predetermined, and which have low individual dimensional and dimensional tolerances compared to glass bottles.
  • the surface speeds are measured with a friction wheel rolling on the side of the container, a functionally equivalent roller or the like.
  • a rotary encoder for precise digital speed measurement is coupled to this.
  • the friction wheel can be adjusted, for example, in the vertical direction in order to scan the container sidewall on a representative for the wall contour to be printed height level.
  • the friction wheel then preferably rolls completely on the container. Friction wheels are particularly suitable for bottles with rotationally symmetrical nominal cross section.
  • the surface speeds can be measured without contact by optical scanning of the lateral sections and / or by their acoustic scanning by means of ultrasound. This is particularly advantageous at high relative speeds between the container surface to be measured and the measuring device and / or a short residence time of the container in the region of the measuring device / the printing module.
  • the printing times and / or the angular velocity are further adapted to printing distances to the lateral portions of the containers and / or to intermediate portions. This makes it possible to compensate for transit time differences of individual ink droplets from the nozzles to the sections of the container surface to be printed.
  • the containers are glass bottles, in particular those with rotationally symmetrical nominal cross-section, or molding bottles, in particular those made of plastic. Due to their production, glass bottles have particularly high dimensional and shape tolerances, in particular with regard to their outer circumference and their eccentricity to the bottle mouth. A compensation of different actual printing feeds of individual side wall sections by adjusting the associated printing times is thus particularly important in glass bottles or even a prerequisite for a qualitatively acceptable direct printing by means of inkjet.
  • this is for inkjet printing on containers and comprises: at least one printing module; at least one positioning unit for holding and rotating a container about itself in front of the printing module; at least one measuring device for determining surface velocities of lateral sections of the rotating container; and control means for driving the print module by adjusting time intervals between print timings of the print module in response to the measured surface speeds.
  • the apparatus is then, for example, a staged-type cyclically-operated device in which the containers do not revolve on a carousel or a rotary-type device on which printing modules circulate together with the containers. It is also conceivable that the container held by the positioning unit on the at least one Run continuously along the printing module, for example, along a linearly extending in the region of the print module transport path,
  • this serves inkjet printing on containers and comprises: at least one printing module; a carousel with surrounding positioning units for holding and rotating the containers around themselves; at least one measuring device for determining surface velocities of lateral sections of the circulating containers; and control means for driving the print module by adjusting time intervals between print timings of the print module in response to the measured surface speeds.
  • the containers can be rotated both in front of stationary printing modules to produce a print feed, as well as in front of rotating printing modules.
  • the print modules could each circulate on carousels serially traversed by the containers, the carousels then preferably each being associated with a particular color of a color model or performing a particular pretreatment / aftertreatment step, such as curing.
  • Carousels assigned to a particular partial pressure step or treatment step can be inserted into the serial sequence of carousels in a modular manner, depending on the required colors and / or processing steps, or 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 transport / positioning aids.
  • the measurement of the surface speed according to the invention can be used in a targeted manner for the correction of printing times and / or the adaptation of the angular velocity / rotational speed of the containers for the printing of individual circumferential portions with a specific print head.
  • Printheads and units for curing the imprint could also be formed in a common horizontal plane, in particular star-shaped, around a positioning unit for holding and rotating a container around itself.
  • the measurement of the surface speed according to the invention can then be used for the correction of printing instants on the print head or the like which is just facing the measured surface.
  • the inventive adaptation of printing times / rotational speeds could be used on printing modules in which the print heads arranged one above the other are, so the containers are moved for the partial pressure change / printhead change along its longitudinal axis and preferably printed in different horizontal planes.
  • the measuring device comprises a friction wheel with rotary encoder, wherein the friction wheel is resiliently biased 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 movably mounted together in the direction of the container.
  • unrolling the friction wheel on the container then results in a constant pressure distance between the container surface and the nozzle / nozzle rows of the printing module.
  • the friction wheel then acts as a control roller for the nozzles / nozzle rows.
  • the container surface then acts as a corresponding control cam.
  • the measuring device operates without contact on the basis of an optical and / or acoustic scanning beam.
  • the scanning thus takes place, for example, by means of laser light or ultrasound.
  • Optical code readers, line scanners, cameras or the like are suitable for optical scanning.
  • the Fig. 1 schematically shows a speed measurement according to the invention on a direction indicated in the plan view container 1, which is rotated about an axis of rotation 2a of a positioning unit 2 with an angular velocity 3 around itself. Due to an eccentric position and / or shape of a lateral surface 4 of the container 1 with respect to the axis of rotation 2a, partially designated sections A1-A3 of the lateral surface 4 run along paths B1-B3 with different surface speeds V1-V3. This is in the Fig. 1 indicated schematically 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 speeds V1 - V3 are caused by the radial distances of the lateral 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 the largest radial distance.
  • Different radial distances lateral wall areas occur due to production, for example, glass bottles, which are clamped centered at their mouths with respect to the axis of rotation 2a.
  • the distribution of the local surface velocity V along a circumferential line of the surface 4 is preferably fully measured continuously with continuously rotating container 1 , As a partial result one obtains the exemplified surface velocities V1-V3 of the partially circumferential sections A1-A3.
  • the local resolution of the speed measurement according to the invention can be adapted to the requirements of inkjet printing.
  • a section A6 lying between the lateral sections A2 and A3 is indicated, whose surface speed could be measured as well as calculated by interpolation of measured values, for example the surface speeds V2 and V3, or in another way.
  • the course of the local surface velocity V of the scanned lateral surface 4 is a function of the rotational position ⁇ when rotated about the axis of rotation 2a (exaggerated for clarity) in the Fig. 1 shown below.
  • the local surface velocities V measured between the rotational positions ⁇ 1- ⁇ 3 and the associated partially circumferential portions A1-A3 are shown as a solid line.
  • the further course is indicated by dashed lines.
  • the temporal sequence of printing times 6 is adjusted for individual teilumfteilliche sections of the lateral surface 4 to the respective associated local surface velocity V. That is to say, for printing on the partial circumferential sections A1-A3 illustrated by way of example, the length of the time intervals I1-I3 between individual printing times 6 of a specific nozzle or a nozzle row oriented transversely to the printing direction is adapted to the associated surface speeds V1-V3.
  • the adaptation according to the invention of the printing times 6 is in the Fig. 1 indicated schematically along a linear time axis over the associated lateral sections A1, A2 and A3.
  • the longest time intervals I1 between printing commands to a particular nozzle or nozzle row are used for printing the part circumference A1 with the smallest surface speed V1, and vice versa the shortest time intervals I3 between individual pressure commands to the same nozzle or nozzle row for printing the partially circumferential portion A3 with the greatest surface speed V3.
  • the time intervals between the print commands for individual nozzles or nozzle rows of a print head thus become shorter the faster the part of the page 4 to be printed on the side surface 4 moves in the feed direction.
  • a time interval between individual printing times typical for the performance of the printhead used can be used.
  • the Fig. 2 shows a speed measurement according to the invention by means of a measuring device 7 comprising a friction wheel 7a, which 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 with the local surface speed V in terms of a printing feed with respect to a printing module 8.
  • the measuring device 7 includes, for example, a rotary encoder, the measurement data DV regarding the local surface velocity V on the friction wheel 7a to a Control unit 9 or the like transmitted.
  • the latter also serves to control the printing module 8, which comprises at least one schematically indicated printhead 8a, with printing commands CD for discharging ink at the printing times 6.
  • a first preferred embodiment 10 of 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 and a conveyor belt 12 or the like, are transferred from the container to be printed 1 cyclically to the printing station 11 ,
  • 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
  • the surface speed V can also be scanned in this case with the measuring device 7 rolling or non-contact.
  • the friction wheel 7a is preferably resiliently biased in the direction of the lateral surface 4 to be scanned.
  • An associated pressing force 7b is schematically indicated by an arrow.
  • the friction wheel 7a thereby remains in frictional contact with the lateral surface 4 to be scanned.
  • the friction wheel 7a is telescopically mounted in the direction of the lateral surface 4. It would also be conceivable to mount the friction wheel 7a on a spring-biased lever or the like.
  • the printing module 8 and / or the print head 8a may be mounted in a position fixed relative to the rotation axis 2a or a certain value or range of the pressure distance from the surface 4 comply.
  • the printhead 8a could be moved toward or away from the scanned lateral surface 4 following the axis of rotation 2a.
  • the print head 8a would be displaceable on a linear unit (not shown), for example. The adjustment could be done both by means of an existing on the linear unit electric motor as well as 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 side surface 4 would then act together in the sense of a control roller and a cam to adjust the print head 8a following the surface 4 while maintaining a constant pressure distance.
  • the partially circumferential sections A1 - A3 can be scanned in a functionally corresponding manner with the friction wheel 7a in order to measure the associated local surface velocities V1 - V3 or in general the course of the local surface velocity V and the pressure times 6 and / or the angular velocity 3 for the respective associated partial 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 velocity 3 can be carried out with the aid of the control unit 9 or the like units in ongoing printing operation (on the fly). Adjusted printing times 6 can then be used in succession with uninterrupted rotation of the container 1 also for printing operations on further print heads 8a, for example for multicolor printing. Subprints can then be produced with individual print heads 8a with uniform printing resolution and / or seamlessly lined up. Such partial imprints contain, for example, different color components of a color model or complementary image excerpts of a printed image. Adapted sequences of the angular velocity 3 are particularly suitable for modular stations where only one color component is printed or only one specific treatment step is carried out.
  • the stabilization of the pressure feed according to the invention allows correct offsets to be maintained between cooperating nozzle rows or nozzle blocks.
  • the circumferential distribution of the local surface velocity V is typically dependent on the measured container 1 or, depending on the manufacturing tolerance, for a particular type of container and at known angular velocity 3 of the container rotation only on the rotational position ⁇ of the positioning unit 2 and the container 1.
  • printing times 6 adapted according to the invention can in principle be used for any print heads 8a present in the region of the positioning unit 2.
  • the printing times 6 adapted for a particular print head for other print heads in the area of the positioning unit 2 could alternatively be taken over by delaying the adapted printing times 6 by a time offset assigned to the respective further print head.
  • the measured data can also be converted into a coordinate system, for example into a polar coordinate system, and converted for different nominal pressure feeds and / or sequences of the rotational speed / angular velocity 3.
  • the Fig. 3 shows a second preferred embodiment 20 of the device according to the invention, in which the containers 21, which are preferably designed as plastic molding bottles or the like, continuously circulated by a respective positioning unit 2 on a carousel 22.
  • the carousel 22 rotates at a known, in particular constant angular velocity 23.
  • the lateral sections A4, A5 run along tracks B4, B5 with the carousel 22 and have due to different radial distances from the rotational axis 22a of the carousel 22 different surface velocities V4, V5. This is in the Fig. 3 for better understanding again indicated by differently sized block arrows. Again, the different surface speeds V4, V5 cause different print feeds of the lateral sections A4, A5 before the printing modules 28th
  • the containers 21 can be rotated around themselves in front of the printing modules 28 at the angular speed 3, so that the printing feed of transport movement and rotational movement of the containers 21 overlaps. Particularly in this case, different surface speeds and printing feeds of individual lateral sections A4, A5 occur,
  • print feeds can be inventively by a control of the nozzle rows 28a or functionally comparable printheads with CD printing commands Compensate ejection of ink drops at adjusted printing times 6 to produce a uniform print resolution in the feed direction.
  • time intervals between the printing times 6 of individual nozzles or rows of nozzles for printing partially circumferential portions of the lateral surface 24 set the shorter, the higher their measured / calculated local surface velocity V is.
  • the course of the angular velocity 3 can be used to stabilize the pressure feed, see the first embodiment.
  • a control unit 29 which also outputs print commands CD to the nozzle rows 28a of the printing modules 28.
  • the containers 21 are not rotated around themselves. Instead, the rotational position ⁇ of the container 21 is set by means of the positioning units 2 before reaching the printing modules 28 by means of a positioning position unit 30 triggered for example by the control unit 29.
  • the second embodiment 20 of the device according to the invention could also container 1 with rotationally symmetrical desired cross-section directly print.
  • the local surface velocities V of individual part-circumferential portions of the lateral surface 4 could then, for example, be superimposed by a rotation of the containers 1 about 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 (FIG the angular velocity 23 about the axis of rotation 22a).
  • Both a container rotation about itself and a transport on the carousel 22 cause each curved trajectories B1 - B3 or B4 and B5 side surfaces 4, 24 of the container 1, 21.
  • At constant angular velocity 3, 23 occur in both cases, depending according to the radius of curvature of the trajectories in front of a print head 8a / nozzle row 28a different print feeds, which can be compensated according to the invention.
  • a pressure difference which varies on the basis of the container cross-section can be taken into account by additional temporal offset of the printing times 6, in that transit time differences of individual ink drops up to the respective partially circumferential section A1-A5 of the lateral container surface 4, 24 are compensated.
  • the lateral surfaces 4, 24 can be scanned both continuously by means of friction wheel 7a and also contactless by means of scanning beam 5a, for example in the form of laser light or ultrasonic waves.
  • the local surface velocity V could be imaged, for example by means of a camera and digital image analysis (not shown).
  • the described embodiments 10, 20 can be combined arbitrarily in a technically meaningful way.
  • rotational movements of the containers 1, 21 about themselves and transport movements along curved paths can be combined almost arbitrarily, in particular in accordance with the invention adaptation of the printing times in real time / on-the-fly.
  • printing modules 8, 28 could rotate together with the positioning units 2 and the containers 1, 21 on a carousel.
  • the adaptation according to the invention of printing times is applicable regardless of how individual nozzles, nozzle rows 28a or print heads 8a are distributed on printing modules 8, 28.
  • a plurality of combined interacting print heads, rows of nozzles and / or nozzle blocks, for example at print widths above 70 mm, can either be controlled individually or jointly.
  • a stabilization of the printing advance 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 themselves.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ink Jet (AREA)
EP15194936.9A 2014-12-09 2015-11-17 Procédé et dispositif pour l'impression à jet d'encre sur des recipients Active EP3040205B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014225256.3A DE102014225256A1 (de) 2014-12-09 2014-12-09 Verfahren und Vorrichtung für den Tintenstrahldruck auf Behälter

Publications (2)

Publication Number Publication Date
EP3040205A1 true EP3040205A1 (fr) 2016-07-06
EP3040205B1 EP3040205B1 (fr) 2019-12-25

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US (1) US9878533B2 (fr)
EP (1) EP3040205B1 (fr)
CN (1) CN105691021B (fr)
DE (1) DE102014225256A1 (fr)

Cited By (1)

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CN106585151A (zh) * 2016-12-19 2017-04-26 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

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* Cited by examiner, † Cited by third party
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DE102016225323A1 (de) * 2016-12-16 2018-06-21 Krones Ag Verfahren und Direktdruckmaschine zur Bedruckung von kreisrunden Behältern mit einem Direktdruck
DE102016226166A1 (de) * 2016-12-23 2018-06-28 Krones Ag Verfahren und Direktdruckmaschine zur Bedruckung von Behältern aus unterschiedlichen Materialtypen im Direktdruck
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CN105691021A (zh) 2016-06-22
EP3040205B1 (fr) 2019-12-25
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US20160159087A1 (en) 2016-06-09
US9878533B2 (en) 2018-01-30

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