EP3088189B1 - Druckeinrichtung und verfahren zum bedrucken eines druckobjekts - Google Patents

Druckeinrichtung und verfahren zum bedrucken eines druckobjekts Download PDF

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Publication number
EP3088189B1
EP3088189B1 EP15165959.6A EP15165959A EP3088189B1 EP 3088189 B1 EP3088189 B1 EP 3088189B1 EP 15165959 A EP15165959 A EP 15165959A EP 3088189 B1 EP3088189 B1 EP 3088189B1
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EP
European Patent Office
Prior art keywords
printing
charging
designed
movement
printing object
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
EP15165959.6A
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German (de)
English (en)
French (fr)
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EP3088189A1 (de
Inventor
Joachim Dipl. Ing. Schulz (FH)
Joachim Dipl. Ing(FH) Weber
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.)
Hinterkopf GmbH
Original Assignee
Hinterkopf 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 Hinterkopf GmbH filed Critical Hinterkopf GmbH
Priority to EP15165959.6A priority Critical patent/EP3088189B1/de
Priority to ES15165959T priority patent/ES2842106T3/es
Priority to PL15165959T priority patent/PL3088189T3/pl
Publication of EP3088189A1 publication Critical patent/EP3088189A1/de
Application granted granted Critical
Publication of EP3088189B1 publication Critical patent/EP3088189B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing

Definitions

  • the invention relates to a printing device for printing on a print object, with an output device which is designed to output drops of ink on an exit surface, with a receiving device for a print object, which is designed for a relative movement of the print object with respect to the output device for performing the printing process and which is opposite is arranged to the exit surface in order to enable a contactless provision of ink droplets on predeterminable surface areas of the print object, the output device and the loading arrangement being arranged as processing stations on a machine frame, the machine frame being assigned several movably mounted receiving devices that are used for transporting print objects between the processing stations are formed along a movement path.
  • the invention also relates to a method for printing a print object.
  • a printing device for printing a circumferential surface of an object having at least two print heads, each of which comprises at least one row arrangement of ink metering elements, in particular ink nozzles, each of which for an individually specifiable output of ink the object are formed.
  • At least one of the print heads is movably arranged along an axis of extent of the ink metering elements on a print head carrier, the movably mounted print head being assigned an electrically controllable setting device for setting a relative position with respect to the at least one further print head.
  • the DE 10 2012 213 079 A1 discloses a system for printing containers with a printing device and a container pre-treatment device upstream of the printing device and a container conveying element for the transport and / or distribution of containers to be printed which are supplied to the system, the container pre-treatment device at least four different pre-treatment units for preparing the containers for the Having printing process, namely a container cleaning unit, a conditioning unit, a surface activation unit and an electrostatic unit for electrostatic discharge or charging of the container surface.
  • a printing device for printing bottles with several printing positions on a circulating drivable transport element is known, the printing position and / or the containers being moved on a self-contained path between at least one container task and at least one container removal, and with concurrent print heads for applying a print image a region of the container outer surface of the container to be printed is provided during a relative movement of the respective container outer surface and at least one print head.
  • the object of the invention is to provide a printing device and a method for printing a print object, in which an improved efficiency for the printing process is achieved.
  • a sensor arrangement for detecting an electrostatic charge of the print object is arranged along the path of movement after the charging arrangement and is designed to provide a charge-dependent sensor signal
  • the charging arrangement comprising a control device which is responsible for charging the print object as a function of a signal level of the Sensor signal is designed to enable subsequent printing objects to be charged with a suitable amount of electrical charge as a function of the existing potential difference.
  • the print object is electrically, in particular electrostatically, charged, as a result of which an electrical field is formed with respect to the output device.
  • an attraction force acts on the ink droplets provided by the output device, which makes it possible to influence a trajectory of the ink droplet between the output device and the print object.
  • the trajectory of the ink droplet depends on the one hand on the alignment of the output device with respect to the print object, and one or more parameters from the group: viscosity of the ink droplet, size of the ink droplet, exit speed of the ink droplet from the output device, play a role for the trajectory of the ink droplet. It also has a relative movement of the print object compared to the output device has a significant influence on the trajectory of the paint drop.
  • the charging of the print object serves to direct microdroplets, which are also referred to as microsatellites, onto the print object when the ink droplet breaks off from the output device and thus prevents these microdroplets from precipitating elsewhere. At least when looking at longer periods of time, if the print object is not charged, the microdroplets can form an undesirable color deposit, which may then have to be removed. With the charging of the print object, a paint mist formed at the output device by the microdroplets is minimized, since the microdroplets are directed onto the print object. It is assumed that the microdroplets are so small that they have no influence on the print quality of the print on the print object.
  • the printing process takes place in a non-evacuated, gas-filled, in particular air-filled, volume of space. Due to aerodynamic effects due to the relative movement of the print object in the gas volume and in relation to the output device, which is usually arranged at rest, deflection forces occur on the ink droplets, which may lead to an undesired change in the position of the ink droplet on the printed object. On the one hand, the air resistance of the paint droplet is important here, which may lead to a deformation of the paint droplet on the trajectory and thus to a change in the trajectory.
  • aerodynamic effects on the surface of the printed object play a role, which are also referred to as interface effects.
  • interface effects gas particles of the gas atmosphere surrounding the print object immediately adjacent to the surface of the print object have the same speed as the surface of the print object and thus have no differential speed.
  • the differential speed of the gas particles increases.
  • a gas layer that directly surrounds the outer surface of the print object is moved at least almost at the peripheral speed around an axis of rotation with which the outer surface of the print object is also moved about this axis of rotation.
  • the speed difference between the gas particles and the outer surface of the printed object increases.
  • the velocity gradient within the gas layer that surrounds the print object has an effect on the trajectory of the ink drop. This causes an undesirable deflection of the ink drop from its originally intended impact position on the print object.
  • the effect of the electric field on the ink droplet can at least largely compensate for the undesired deflection effects of the gas layer, so that improved positional accuracy for placing the ink droplets on the outer surface of the printed object can be achieved.
  • those that arise when the paint droplets tear off from the dispensing device can be used Microdroplets are at least partially, preferably predominantly, in particular completely, directed onto the print object and are not deposited elsewhere.
  • the charging arrangement is designed for electrostatic charging of the print object, this electrostatic charge being able to be maintained at least for a certain period of time without further supply of electrical charges to the print object. This is particularly the case when the print object is designed as an electrical insulator, in particular made of a plastic material.
  • the output device and the print object in particular during the printing process, are acted upon in the manner of a capacitor with a constant electric field or an alternating electric field, whereby an electric field effect can also be exerted on the ink drop, which is necessary for a provides improved positioning of the ink droplet on the outer surface of the print object.
  • the print object is made from an electrically conductive material, but such a procedure can also be provided for a print object made from an electrically insulating material with a suitable selection of the applied electrical voltages.
  • the output device is designed as an inkjet printer device, which has one or more, preferably along a straight, output surface on the output surface Line, in particular at regular spacing, arranged outlet nozzles.
  • fine color drops of an inkjet printing ink are emitted or ejected into an environment with the aid of a print head, preferably perpendicular to an exit surface.
  • the print head has a conveying device, which can in particular be one or more piezoelectric pumps, whereby it is preferably provided that the pump (s) are electrically controlled by a control device that generates electrical voltages in the range of several 1000 volts can provide.
  • the amount of paint discharged during a pump stroke is released into the environment through a suitably shaped outlet nozzle and moves along a straight trajectory without external influences. It is preferably provided that an outer surface of the print object to be printed is oriented transversely to the flight path. Accordingly, under ideal conditions and without external influences, the ink drop would strike in the normal direction on the outer surface of the print object.
  • the receiving device has a receiving mandrel or printing object holder which is mounted, in particular driven, so that it can rotate about a longitudinal axis and is designed to receive or hold the printing object.
  • the longitudinal axis of the receiving device is preferably arranged parallel to the exit surface of the dispensing device.
  • the longitudinal axis of the receiving device particularly preferably runs parallel to an arrangement of outlet nozzles of the dispensing device.
  • the receiving device is provided for the rotatable receiving of print objects.
  • the print objects are preferably designed as cylindrical sleeve-shaped container blanks, in particular as aerosol can blanks.
  • an axis of rotational symmetry of the print objects is aligned coaxially to the longitudinal axis of the receiving device when the print object is received on the receiving device.
  • Typical embodiments for the receiving device are receiving mandrels onto which the print objects can be pushed, or chucks into which the print objects can be pushed at least in certain areas. In the case of a chuck, an introduction of clamping forces is provided on a surface area of an outer surface of the print object, which, however, cannot then be printed.
  • the charging arrangement is designed for a contactless or contact-based provision of electrical charges to the printed object.
  • the charging arrangement is preferably designed for a contactless provision of electrical charges to the print object, since this can avoid a mechanical interaction between the charging arrangement and the print object that is generally undesirable. If a contact-based supply of electrical charges to the print object should be provided, the charge transfer can take place, for example, via contact rollers or contact brushes.
  • the receiving devices are preferably designed for a discontinuous transport of print objects between the processing stations along a movement path in the form of a segment of a circle.
  • the machine frame is preferably a machine frame of a printing machine, on which several processing stations are provided for processing the print object.
  • the processing stations also include the output device and the loading arrangement and, if necessary, additional devices and / or arrangements which are designed to prepare the print object for the printing process and / or to further process the print object after the printing process.
  • several receiving devices are provided, which are arranged in particular on a common, rotatably mounted, workpiece rotary table which is provided with a rotary drive.
  • the rotary drive performs a discontinuous movement, in particular a rotary step movement, of the workpiece rotary table and thus of the receiving devices.
  • the receiving devices can move along a circular segment-shaped movement path between the individual Processing stations, which are preferably arranged at the same angular division and the same radial distance from an axis of rotation of the rotary drive, are moved.
  • the rotary drive can, for example, be an electrical direct drive with a stator fixedly attached to the machine frame and a rotor mounted so as to be able to rotate relative to the stator, in particular integrated in the workpiece rotary table, which performs the desired rotary movement around a preferably vertically oriented axis of rotation by charging with electrical energy .
  • the charging arrangement is arranged along the movement path upstream in front of the output device and that a neutralization arrangement is arranged along the movement path upstream in front of the charging arrangement, which is designed to neutralize electrical charges of the print object.
  • the neutralization arrangement With the help of the neutralization arrangement, the preferably complete electrical discharge before the respective print object is transported to the charging arrangement ensures that a desired charge level can be reliably achieved in the subsequent step of applying electrical charges to the printing object by the charging arrangement.
  • processing steps on the print object preceding the printing process can also benefit from a neutral print object before this is electrically charged by the charging arrangement for the advantageous implementation of the printing process.
  • a sensor arrangement for detecting an electrostatic charge of the print object is arranged along the path of movement after the charging arrangement and for providing a charge-dependent sensor signal is formed, wherein the charging arrangement comprises a control device which is designed for charging the print object as a function of a signal level of the sensor signal.
  • the sensor arrangement is preferably designed to determine an electrical potential difference between an outer surface of the printed object and an electrical reference potential and provides a sensor signal that is dependent on this potential difference.
  • This sensor signal is processed by a control device in order to enable subsequent printing objects to be charged with a suitable amount of electrical charge as a function of the potential difference.
  • electrical energy is provided by the control device to the charging arrangement as a function of the sensor level of the sensor signal provided, in order to thereby bring about an advantageous force effect on the paint droplets through the electrical field provided.
  • the receiving device is designed with insulating means for electrically isolated receiving of the print object. This is of interest when the print object is made of an electrically conductive material and does not have its own electrical insulation, such as an interior coating, with respect to the receiving device.
  • the insulating means prevents an undesired flow of electrical charges, which would cause a weakening of the electrical field with respect to the output device.
  • the processing stations and the receiving devices are accommodated in a volume of space that is defined by boundary walls is limited and separated from an environment and in which there is a constant room temperature and / or a predeterminable overpressure relative to the environment. This allows reproducible conditions for the printing process to be guaranteed.
  • the task of the discharge arrangement is to remove any electrical charges that may have remained on the print object after the end of the printing process, at least as far as possible, in order to enable undisturbed further processing of the print object.
  • the discharge arrangement can be designed for contact-based or preferably contactless discharge of the printed object.
  • the object of the invention is also achieved by a method as specified in claim 10.
  • the method comprises the steps of: providing a print object at a feed station and picking up the print object at a receiving device at the feeding station, electrostatic charging of a printing object that is received at the receiving device with a charging arrangement that provides a contactless charge flow to the print object, moving the print object from the loading arrangement to an output device, printing an outer surface of the print object with Ink droplets that are delivered to the print object in a contactless manner at an exit surface of the output device opposite the print object, during an, in particular rotating, relative movement of the print object with respect to the output device, moving the print object to a removal station and removing the print object from the receiving device at the transport station.
  • the print object is moved between the supply station and the discharge station along a movement path, in particular in the form of a segment of a circular arc, with an, in particular intermittent, conveying movement and that electrical charges on the printing object are neutralized along the movement path upstream in front of the charging arrangement is carried out by means of a neutralization arrangement.
  • an electrostatic charge of the print object is determined before the printing process is carried out and / or while the printing process is carried out, and that electrical charges are made available from the charging arrangement to the print object as a function of a determined electrostatic charge of the print object becomes.
  • the printing machine 1 shown comprises a workpiece rotary table 3 rotatably mounted around a rotation axis 2 on a machine frame (not shown) and several workpiece holders 4, each mounted in pairs on the workpiece rotary table 3, serving as recording devices.
  • the workpiece holders 4 are individual with drive means (not shown) about rotation axes 5 rotatably mounted.
  • the workpiece receptacles 4 are provided for receiving sleeve-shaped objects 6, in particular designed as aerosol can blanks or tube blanks, at least essentially with a circular cylindrical cross section.
  • the workpiece receptacles 4 are preferably designed as mandrels onto which the objects 6, designed as hollow bodies, in particular as hollow cylinders closed on one side, and also referred to as printed objects, can be attached.
  • each of the workpiece receptacles 4 is assigned its own, separately electrically controllable drive motor (not shown) which enables the respective workpiece receptacle 4 to rotate about the respective axis of rotation 5. This possibility for the, in particular regulated, rotation of the respective workpiece holder 4 is used in particular when carrying out the printing process.
  • the work station 8 is a loading station, also referred to as a feed station, at which the cylindrical objects 6, for example in pairs, onto the workpiece holders 4 by a suitable transport device 19, which is coupled to a conveyor system, not shown in detail, for the cylindrical objects 6 are pushed on.
  • the workstation 9 comprises one in the Figure 5 Neutralization arrangement 49 shown in more detail, with which the object 6 can be discharged.
  • the neutralization arrangement 49 comprises two electrodes 51, 52 which are arranged at a distance from one another on a base body 50 and to which an alternating electric field is applied by a control device 53.
  • An electrical voltage and a frequency of the alternating electrical field are matched to the spacing of the electrodes 51, 52 in such a way that gas, in particular air, present in the vicinity of the electrodes 51, 52 can be ionized and a charge equalization with the electrical charges that are present on the outer surface 25 of the article 6 can take place.
  • the now electrically neutral object 6 is then conveyed along the movement path 7 to the subsequent work station 10.
  • the work station 10 Downstream along the movement path 7, the work station 10, which is an example of a cleaning arrangement, is provided following the work station 9.
  • the cleaning station is designed as a suction device which is designed for contactless suction of the outer surface 25 of the object 6.
  • an optical scanning of the cylindrical objects 6 in order to determine a rotational position of the cylindrical objects 6, for example to ensure a correct rotational alignment of the cylindrical objects 6 for a printing process taking place at the work station 12.
  • This is particularly important when the surface of the objects 6 to be printed is provided with features which are intended to fit in a predetermined manner with the printed image to be applied. These features can be, for example, local indentations and / or impressions (embossing) in and / or from the surface of the object 6 and / or preprinted areas which in turn are intended to serve as a primer for the subsequent printing.
  • the schematically illustrated charging arrangement 30 has a control device 31 and a charging electrode 32.
  • the control device 31 is connected to the charging electrode 32 via a connecting line 33 and can optionally be connected to the workpiece rotary table 3 with a further connecting line 35.
  • the control device 31 further comprises a sensor input 34 to which a signal level of a sensor means 40, which is described in more detail below, can be electrically connected, which is designed to detect an electrical charge on the object 6.
  • control device 31 applies electrical energy to the charging electrode 32 in such a way that the charging electrode 32 emits negative charges in the direction of the object 6, which are deposited on the outer surface 24 of the object 6 and cause a negative electrostatic charge there.
  • control device 31 applies an electrical potential to the workpiece rotary table 3 by means of the connecting line 35, which is used to improve the static charging of the object 6.
  • the charging arrangement 30 shown is designed for a contactless provision of electrical charges to the object 6, are in the in Figure 4
  • the alternative embodiment of a charging arrangement 60 shown here is provided with flexible electrodes 61 on the charging electrode 62, which are provided for a contact-based transfer of electrical charges to the object 6.
  • the same reference numerals are used for components with the same function as in Figure 3 used.
  • one of the two charging arrangements 30, 60 can be provided for the static charging of the object 6.
  • the now statically charged object 6 is moved in the course of a further rotary step movement of the workpiece rotary table 3 about the axis of rotation 2 to the work station 13 in order to be able to use the in Figure 2 to be printed in more detail printing device 21.
  • the object 6, which is exemplarily designed with a circular cylindrical cross-section, has a rotational movement about the in Figure 1
  • Rotation axis 5 shown performs and during the rotational movement by a in the Figure 2 schematically illustrated print head 22, which is an example of an inkjet print head, can be printed.
  • the print head 22 which is exemplarily at a distance of 1 mm to 5 mm from the surface of the object 6 is arranged and which is controlled by a pressure control device 24 with electrical signals, not shown in detail is outputted drops of color.
  • aerodynamic interactions occur between the atmosphere surrounding the object 6 and the object 6.
  • these interactions lead to a deflection of the color droplets, in particular directed in a tangential direction to the outer surface 25 of the object 6.
  • the object 6 is electrostatically charged, with forces of attraction caused by the electric field acting on the paint droplets directed in the direction of the object 6.
  • the electrostatic charging of the object 6 is used to at least partially, preferably predominantly, in particular completely, the microdroplets that occur when the paint droplets tear off from the dispensing device and thus avoid undesired precipitation of these microdroplets elsewhere.
  • an electrical direct voltage can be applied to the workpiece holder 4 and the object 6, which is electrically isolated from the workpiece holder 4, in order to allow an additional electric field force to act on the ink drops.
  • a neutralization of electrical charges that are still present on the outer surface 25 of the object 6 after the printing process is provided at the work station 14.
  • the workstation 14 is constructed in the same way as the workstation 9 and also includes that in FIG Figure 5 Sensor means 40, shown only in dashed lines, which is designed to detect the electrical charge of object 6 and which is electrically connected to sensor input 34 of control device 31.
  • the work station 15 arranged downstream of the work station 14 along the movement path 7 is exemplarily designed as an inspection device and enables a print quality of the print image applied by the print station 21 to the peripheral surface of the object 6 to be determined.
  • the further work stations 16 and 17 are used for further processing of the cylindrical objects 6, for example for applying a protective varnish to the printing or for mounting components on the objects 6.
  • the workpiece rotary table 4 executes a rotary step movement by the angle W for the step-by-step machining of the cylindrical objects 6 at the respective work stations 8 to 18, in which the workpiece holders 4 arranged in pairs from a position opposite the respective work station 8 to 18 into one of the respective subsequent work stations 8 to 18 opposite position transported
  • the rotary step movement takes place as a sequence of acceleration from standstill, deceleration from the target speed reached and a subsequent standstill time.
  • a drive, not shown in detail, for the workpiece rotary table 3 is preferably designed in such a way that the acceleration and deceleration of the workpiece rotary table 3 can be set freely over a wide range and the downtime is completely freely adjustable and adapted to the requirements of machining the respective cylindrical objects 6 at the workstations 8 to 18 can be.
  • control device 24 control device 31 and control device 53 are electrically connected to one another, in particular as bus subscribers, and are controlled in a coordinated manner by a higher-level control device, not shown, in particular a programmable logic controller (PLC).
  • PLC programmable logic controller

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP15165959.6A 2015-04-30 2015-04-30 Druckeinrichtung und verfahren zum bedrucken eines druckobjekts Active EP3088189B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15165959.6A EP3088189B1 (de) 2015-04-30 2015-04-30 Druckeinrichtung und verfahren zum bedrucken eines druckobjekts
ES15165959T ES2842106T3 (es) 2015-04-30 2015-04-30 Equipo de impresión y procedimiento para imprimir un objeto de impresión
PL15165959T PL3088189T3 (pl) 2015-04-30 2015-04-30 Urządzenie drukujące i sposób zadrukowywania obiektu drukowanego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15165959.6A EP3088189B1 (de) 2015-04-30 2015-04-30 Druckeinrichtung und verfahren zum bedrucken eines druckobjekts

Publications (2)

Publication Number Publication Date
EP3088189A1 EP3088189A1 (de) 2016-11-02
EP3088189B1 true EP3088189B1 (de) 2020-11-18

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EP15165959.6A Active EP3088189B1 (de) 2015-04-30 2015-04-30 Druckeinrichtung und verfahren zum bedrucken eines druckobjekts

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EP (1) EP3088189B1 (es)
ES (1) ES2842106T3 (es)
PL (1) PL3088189T3 (es)

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Publication number Priority date Publication date Assignee Title
IT202100014864A1 (it) * 2021-06-08 2022-12-08 Quantix Digital S R L Dispositivo di pretrattamento e macchina da stampa digitale a getto di inchiostro che include tale dispositivo di pretrattamento
DE102021133097A1 (de) 2021-12-14 2023-06-15 Krones Aktiengesellschaft Verfahren und Vorrichtung zum Bedrucken von Behältnissen mit elektrostatischer Aufladung von Behältnissen

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Publication number Priority date Publication date Assignee Title
DE102009013477B4 (de) * 2009-03-19 2012-01-12 Khs Gmbh Druckvorrichtung zum Bedrucken von Flaschen oder dergleichen Behältern
DE102012213079A1 (de) * 2012-07-25 2014-01-30 Krones Ag Druckvorbehandlung
PL2860036T3 (pl) 2013-10-09 2020-08-24 Hinterkopf Gmbh Urządzenie drukujące, maszyna drukarska i sposób eksploatacji urządzenia drukującego

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Publication number Publication date
EP3088189A1 (de) 2016-11-02
PL3088189T3 (pl) 2021-05-31
ES2842106T3 (es) 2021-07-12

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