EP3887265A1 - Procédé de pulvérisation d'une colle à froid sur des étiquettes et groupe d'étiquetage pour des contenants - Google Patents

Procédé de pulvérisation d'une colle à froid sur des étiquettes et groupe d'étiquetage pour des contenants

Info

Publication number
EP3887265A1
EP3887265A1 EP19780203.6A EP19780203A EP3887265A1 EP 3887265 A1 EP3887265 A1 EP 3887265A1 EP 19780203 A EP19780203 A EP 19780203A EP 3887265 A1 EP3887265 A1 EP 3887265A1
Authority
EP
European Patent Office
Prior art keywords
glue
labels
cold glue
spray nozzles
electromagnetic valves
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
EP19780203.6A
Other languages
German (de)
English (en)
Other versions
EP3887265B1 (fr
EP3887265C0 (fr
Inventor
Heinrich Bielmeier
Stefan Poeschl
Florian HABERSETZER
Andreas Kursawe
Christian Stoiber
Hartmut Davidson
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 EP3887265A1 publication Critical patent/EP3887265A1/fr
Application granted granted Critical
Publication of EP3887265B1 publication Critical patent/EP3887265B1/fr
Publication of EP3887265C0 publication Critical patent/EP3887265C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
    • B65C9/00—Details of labelling machines or apparatus
    • B65C9/20—Gluing the labels or articles
    • B65C9/22—Gluing the labels or articles by wetting, e.g. by applying liquid glue or a liquid to a dry glue coating
    • B65C9/2204—Gluing the labels or articles by wetting, e.g. by applying liquid glue or a liquid to a dry glue coating using spraying means
    • B65C9/2213—Applying the liquid on the label
    • B65C9/2217—Applying the liquid on the label discretely, i.e. several points or strips or interrupted films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/04—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for sequential operation or multiple outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/24—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means incorporating means for heating the liquid or other fluent material, e.g. electrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
    • B05C5/0275—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve
    • B05C5/0279—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated flow controlled, e.g. by a valve independently, e.g. individually, flow controlled

Definitions

  • the invention relates to a method for spraying cold glue on labels according to the preamble of claim 1 and a labeling unit for containers according to the preamble of claim 8.
  • labeling units with umlau fenden vacuum pallets are known, which take labels from a label magazine, transport them through the work area of a glue syringe for applying cold glue and transfer the labels glued in this way directly to containers to be labeled .
  • Printheads have been proposed for the glue syringes, which eject the cold glue by means of piezo elements at comparatively high working pressures of approximately 40 bar.
  • the cold glue used for this has a comparatively high viscosity, for example between 20 and 200 Pa-s.
  • the object is achieved with a method according to claim 1. Accordingly, this is used for spraying cold glue onto labels, in particular in a labeling machine for containers.
  • the labels are transported through the working area of a print head with spray nozzles arranged in a grid, and the cold glue is dispensed onto the labels by the spray nozzles.
  • a working pressure of the cold glue of 0.1 to 10 bar is set for the area of the print head.
  • the dispensing of the cold glue is controlled by means of individually assigned electromagnetic valves.
  • the pressure range specified above is particularly advantageous for efficient glue supply and reliable operation of electromagnetic valves, but could in principle also be extended upwards.
  • piezo-operated valves would also be usable at the specified pressure values, but electromagnetic valves according to the invention are inferior, in particular, in terms of cost-effectiveness for purchase and operation.
  • the electromagnetic valves can preferably be opened gradually by applying a control voltage against a spring tension. The electromagnetic valves then close automatically when the control voltage is switched off by means of spring tension.
  • the cold glue is preferably structurally viscous in such a way that its viscosity at a stirring speed of 100 / min is 0.02 to 0.5 Pa-s and in particular 0.05 to 0.2 Pa-s and the viscosity at a stirring speed of 10 / min is at least 1.5 times, in particular we at least three times.
  • This enables optimization of the flow properties of the cold glue in the area of the print head and in particular in the area of the electromagnetic valves and spray nozzles.
  • the specified intrinsic viscosity enables the cold glue to become so viscous after dispensing from the spray nozzles at ambient pressure that it adheres to the essentially upright transported labels and does not run down at the point of impact.
  • a structural viscosity is understood to mean that the viscosity of the cold glue decreases with increasing shear stress and thus with increasing working pressure.
  • the stirring speed relates to a rotary viscometer and in particular to a Brookfield viscosity measurement.
  • the viscosity of the cold glue is preferably measured in accordance with ISO 1652, i.e. using standardized LV measuring bodies.
  • the cold glue falls within the range of low-viscosity non-Newtonian liquids.
  • the above measurement method is the standard measurement method, but could also be replaced by other measurement methods.
  • a viscosity of the cold glue results in preferably 0.1 to 2 Pa-s in the area of the print head. This has proven to be particularly advantageous for the targeted delivery of sharply defined glue jets.
  • the delivery of the cold glue by changing the working pressure and / or a clock ratio for opening / closing the electromagnetic valves, that is, a clock ratio of the opening duration to the closing duration of the valves, and / or an opening degree of the electromagnetic valves to a transport speed of the labels in the Be rich the print head and / or adapted to a glue pattern to be produced on the labels.
  • a clock ratio for opening / closing the electromagnetic valves that is, a clock ratio of the opening duration to the closing duration of the valves, and / or an opening degree of the electromagnetic valves to a transport speed of the labels in the Be rich the print head and / or adapted to a glue pattern to be produced on the labels.
  • This allows, for example, the amount of glue delivered per unit of time to be adapted to the machine performance of the labeling unit.
  • Different glue images ie two-dimensional patterns of glue dots and / or glue beads, can be generated on the label depending on the electronic print template.
  • the glue supply preferably has a variably adjustable glue pressure generator, for example a glue pump, and a pressure sensor for monitoring the working pressure in the area of the printhead.
  • the working pressure is preferably monitored in the print head upstream of the electromagnetic valves.
  • the working pressure can then be regulated as a function of the transport speed of the labels in order to set a quantity of glue delivered per unit of time and / or per label area.
  • the working pressure increases with the transport speed of the labels or the web speed of the pallets.
  • the electromagnetic valves can be opened and closed in a predetermined cycle so that the glue jets on the labels do not produce continuous glue beads, but rather interrupted glue lines or glue points with gaps in between without glue application. This is particularly suitable for spraying a predetermined amount of glue onto labels at a low transport speed, for example when setting up the labeling unit.
  • valves are controlled, for example, by means of pulse-width-modulated signals in such a way that the electromagnetic valves only open incompletely. Controlling the electromagnetic valves in this way reduces the opening cross section of the electromagnetic valves gradually towards the fully open position, so that less glue can pass through.
  • the opening cross section can be gradually increased, for example, with increasing transport speed of the labels.
  • the cold glue is preferably dispensed from the spray nozzles in a spray direction deviating from the horizontal by at most 30 ° and in particular by at most 10 °.
  • the direction of spraying is to be understood as a main spraying direction of the individual glue jets, that is, their orientation.
  • the labels are preferably moved from the pallets in an orthogonally upright position through the working area of the glue syringe.
  • a horizontal or different delivery of the cold glue from the spray nozzles simplifies the generation of predetermined glue patterns on the labels that pass by in this way.
  • the specified structural viscosity of the cold glue means that the cold glue hitting the labels does not run down appreciably from the point of impact.
  • the labels are preferably removed from continuously rotating vacuum pallets from a label magazine, and the labels sprayed with cold glue according to at least one of the above-described embodiments are transferred directly from the vacuum pallets to the containers.
  • This provides equally reliable and flexible labeling that can be adapted to different labels, glue patterns, containers or the like.
  • the electromagnetic valves are cyclically actuated for opening with a first voltage, which is in particular 40-60 V, and each time, in particular until their respective closing, are kept open with a second voltage that is reduced by at least half, in other words, for example, until at the end of single glue beads / glue points.
  • a first voltage which is in particular 40-60 V
  • a second voltage that is reduced by at least half, in other words, for example, until at the end of single glue beads / glue points.
  • the signal exchange preferably takes place between a microprocessor which controls the glue discharge and the driver units respectively assigned to the electromagnetic valves via a data interface by means of shift registers. In principle, however, direct wiring would also be conceivable.
  • the task is also solved with a labeling unit according to claim 8. Accordingly, this is used for labeling containers and in particular for carrying out the method according to at least one of the embodiments described above.
  • the labeling unit comprises a glue syringe for spraying cold glue onto labels, a glue supply for providing the cold glue under excess pressure, at least one pressure head connected to it with grid-shaped spray nozzles for dispensing the cold glue and a means of transport for transporting the labels through the working area of the print head.
  • the glue supply is designed for a working pressure of 0.1 to 10 bar in the print head.
  • the print head also includes electromagnetic valves that can be used to individually control the delivery of the cold glue from the spray nozzles.
  • the spray nozzles preferably have a clear width of 100 to 400 pm and in particular 120 to 300 pm. Such opening cross sections have been found to be particularly advantageous for targeted processing of the cold glue in the specified ranges of the working pressure and the viscosity of the cold glue.
  • the print head preferably comprises print modules arranged one above the other, each with spray nozzles arranged in a cell-like manner, the print modules in particular being stackable directly on top of one another.
  • the pressure modules each combine an identical number of spray nozzles in the sense of modules that can be flexibly combined with one another. For example, each pressure module comprises six to twelve spray nozzles and in particular eight to ten spray nozzles.
  • Each pressure module / module is preferably assigned a separate driver unit with power electronics, so that the electromagnetic valves can be controlled with control voltages of preferably 3 to 12 V.
  • printheads By stacking / stacking the print modules, printheads can be modularly constructed with uniform basic components depending on the requirements, such as the height of the labels. This serves to flexibly adapt the printheads to different conditions of use and enables economical design of differently dimensioned printheads.
  • the printing modules are preferably inclined with respect to the transport direction of the labels and in particular at an angle of 10 to 20 °. Because of the installation space required for the associated electromagnetic valves, the spray nozzles cannot be as narrow as desired put together. Gaps caused by this can be closed by tilting the print modules. For example, each spray nozzle can cover a line height of 2 mm on the labels, a printing module with a suitably inclined row of eight spray nozzles consequently a total of 16 mm label height. Accordingly, printheads in steps of 16 mm could be modularly adapted to different label heights or to the heights of glue images required.
  • the pressure modules are preferably connected in parallel to the glue supply via a distribution chamber on the print head, a pressure sensor for measuring the working pressure and / or a temperature control unit for temperature control of the cold glue being arranged on / in the distribution chamber.
  • a pressure sensor for measuring the working pressure
  • a temperature control unit for temperature control of the cold glue being arranged on / in the distribution chamber.
  • the pressure modules preferably include branch channels for connecting the spray nozzles to the distribution chamber, the ends of the branch channels being able to be connected to cleaning nozzles in a controlled manner by opening additional electromagnetic valves.
  • Each cleaning nozzle is arranged, for example, at the end of a row of associated spray nozzles.
  • a cleaning medium can then effectively flow through the branch channels and the inputs of the electromagnetic valves. These areas can therefore be machine-cleaned together without disassembly. This simplifies the cleaning of the printhead and provides a permanently reliable and reproducible delivery of cold glue.
  • the cleaning nozzles preferably have a larger cross section than the spray nozzles, and / or the cleaning nozzles are arranged in an upper region of the branch channels in such a way that they can be vented through the cleaning nozzles.
  • the branch channels run according to the inclination of the pressure modules in the flow direction from bottom to top, so that the cleaning nozzles are arranged essentially at the upper end of the branch channels. Accordingly, the stub channels after cleaning can be reliably and easily vented through the cleaning nozzles when cold glue is re-introduced.
  • Their larger cross-section compared to the spray nozzles enables efficient and quick cleaning of the print head.
  • the labeling unit further comprises a changeover valve arranged between the glue supply and the print head for the optional supply of cold glue or cleaning medium to the print head.
  • a changeover valve arranged between the glue supply and the print head for the optional supply of cold glue or cleaning medium to the print head.
  • This enables automatic cleaning downstream of the changeover valve, in particular including all components of the printhead. All that is required is to block the glue supply from the glue supply and to open the supply of a cleaning medium, such as a cleaning liquid.
  • glue residues can be prevented from drying downstream of the changeover valve. All areas critical in this regard, in particular in the printhead, can be rinsed in a simple and practical manner, for example.
  • the transport means is preferably a pallet carousel with vacuum pallets for removing the labels from a label magazine and for the immediate transfer of the glued labels to the containers.
  • the vacuum pallets enable a simple and reliably controllable removal of the labels and transfer of the glued labels to the container ter without reaching around, i.e. without gripper cylinder or similar unit for turning the labels before transferring them to the containers.
  • the labeling unit is preferably part of a labeling machine which comprises a continuously rotatable container table for receiving and positioning the containers during the transfer of the labels.
  • the containers can be adjusted and suitably moved in a known manner by turntables with regard to their rotational position.
  • Figure 1 is a schematic plan view of a labeling unit with the glue syringe
  • Figure 2 is a schematic longitudinal section through the glue syringe
  • Figure 3 is a schematic front view of the print head with the spray nozzles.
  • Figure 4 is a schematic example of the structural viscosity of the cold glue.
  • the labeling unit 1 comprises a glue syringe 2 for spraying cold glue 3 onto labels 4, which are transported by vacuum pallets 5 that continuously rotate on a pallet carousel 6 in a transport direction 4a through the working area of the glue syringe 2 can be transported.
  • the vacuum pallets 5 can be pivoted in / against their direction of rotation in order to remove the labels 4 from a label magazine 7 in a manner known in principle.
  • the vacuum lettes 5 pass the labels 4 sprayed with cold glue 3 directly, that is to say without reaching around, to containers 8 to be labeled, which circulate in a known manner on a container table 9 (indicated by a partial circle) of a labeling machine 10.
  • the glue syringe 2 comprises at least one print head 11 with a plurality of print modules 12 arranged one above the other and in particular stacked on top of one another.
  • the print modules 12 are preferably identical.
  • Each pressure module 12 comprises a grid and, in particular, a row of spray nozzles 13 for dispensing the cold glue 3.
  • Each spray nozzle 13 is preceded by a separate electromagnetic valve 14 with which the dispensing of the cold glue 3 from the respective spray nozzle 3 can be controlled mechanically.
  • the electromagnetic valves 14 comprise, for example, a resiliently preloaded valve tappet and an electromagnetic drive for moving the valve tappet against the spring preload from an associated valve seat in order to open the electromagnetic valve 14, possibly only incompletely opening it in an intermediate position.
  • the electromagnetic valve 14 preferably closes automatically due to the spring preload. In principle, however, an actively driven closure for the electromagnetic valve 14 would also be conceivable.
  • Each pressure module 12 has its own driver unit 15 with power electronics for controlling the electromagnetic valves 14 present on the pressure module 12, for example by applying voltages of 15 to 50 V to the electromagnetic valves 14.
  • the individual driver units 15 are controlled by suitable voltage levels, which at for example between 3 and 12 V.
  • the pressure modules 12 share a distribution chamber 16 for the cold glue 3 on the input side in order to keep this for all pressure modules 12 and thus for all electromagnetic valves 14 and associated spray nozzles 13 at a predetermined working pressure 17.
  • a pressure sensor 18 is preferably provided on / in the distribution chamber 16.
  • a predetermined working temperature 19 of the cold glue 3 is also kept constant by a temperature control unit 20 arranged on the distribution chamber 16.
  • the temperature control unit 20 includes components that are known in principle, for example at least one heating element and a temperature sensor.
  • a control unit 21 is also schematically indicated, which evaluates measurement signals from the pressure sensor 18 and regulates the excess pressure in a glue supply 22 supplying the cold glue 3 on this basis in order to keep the working pressure 17 in a predetermined value range.
  • the working temperature 19 could also be specified by the control unit 21.
  • the control of the electromagnetic valves / driver units 15 is also possible starting from the control unit 21.
  • the working pressure 17 and the working temperature 19 in the region of the distributor chamber 16 are set such that the cold glue 3 in the print head 11 and in particular on the electromagnetic valves 14 have a working viscosity 23 of preferably 0.1 and has 2 Pa-s.
  • the flow behavior of the cold glue 3 is then particularly favorable for its controlled and targeted delivery from the spray nozzles 13.
  • connection board 24 for the common power supply and control of the driver units 15 of the individual print modules 12 is also indicated schematically.
  • the connection board 24 preferably carries central electronic components that are required for all assigned driver units 15.
  • a real-time capable microprocessor 25 for controlling the individual Druckmo modules 12 with their driver units 15 and electromagnetic valves 14 may be present.
  • the signal exchange of the microprocessor 25 with the respective driver unit 15 and the electromagnetic valves 14 connected thereto can take place both via a direct wiring and / or preferably via a data interface by means of a shift register.
  • the housing 26 is preferably designed to slope downwards on its upper side, so that any contamination from the printing head 11 can be removed, from its front side with the spray nozzles 13, thus, for example, to the rear or to the side, as is schematically indicated in FIG. 3.
  • a changeover valve 27 which is connected between the glue supply 22 and the print head 1 1 to shut off the glue supply 22 for cleaning the print head 1 1 and instead a cleaning medium 28 in the print head 1 1 and in particular through the distribution chamber 16, to direct the electromagnetic valves 14 and the spray nozzles 13.
  • the cleaning medium 28 is, for example, liquid, vapor or the like and is preferably provided by an integrated and automatically operating cleaning system (not shown).
  • the cold glue 3 is dispensed from the spray nozzles 13 in a spray direction 29 deviating from the horizontal by an angle of at most 30 ° and in particular at most 10 °, in particular in the horizontal spray direction 29.
  • FIG. 3 shows the spray nozzles 13 arranged by stacking print modules 12 in the form of a two-dimensional grid. Accordingly, the print modules 12 and the nozzle rows formed by their spray nozzles 13 are preferably at an angle of incidence 30 of 10 ° to 20 ° with respect to the transport direction 4a of the labels 4 , thus normally inclined with respect to the horizontal.
  • the entire nozzle head 11 can be inclined by the angle of incidence 30 with respect to the transport direction 4a of the labels 4.
  • the pressure modules 12 and associated components obliquely with respect to a housing 26 oriented orthogonally in a conventional manner in the angle of attack 30.
  • FIG. 2 shows on the basis of a label 4 transported through the working area 31 of the print head 11 in the transport direction 4a that each spray nozzle 13 produces a glue application with a line height 32 on the label 4 which is dependent on the opening angle of the emitted glue jet.
  • the line height 32 is, for example, 1 to 3 mm, in particular 1.5 to 2.5 mm.
  • the vertical working areas 33 of the individual printing modules 12 can be maximized by suitably adjusting the angle of attack 30.
  • the vertical working area 33 is obtained by adding the row heights 32 of all the spray nozzles 13 of a specific pressure module 12.
  • a vertical working area 33 of 16 mm per printing module 12 results at a setting angle 30 of 14 ° is then obtained by adding according to the number of sloping one above the other arranged / stacked printing modules 12.
  • Configurations of the printing modules 12 deviating from the example shown would be conceivable, for example with a number of six to twelve and in particular eight to ten spray nozzles 13 per printing module 12.
  • connection board 24 preferably has a plurality of slots for connecting the driver units 15. Depending on the required vertical working area 34 of the print head 11 as a whole, a suitable number of print modules 12 with their driver units 15 can then be connected by a simple plug connection.
  • FIG. 3 also schematically indicates for a row of nozzles that at least one cleaning nozzle 35 is present on each pressure module 12 following the spray nozzles 13, the spray nozzles 13 and the cleaning nozzle 35 being connected to the distributor chamber 16 via a common branch channel 36.
  • the cleaning nozzle 35 is then arranged in the direction of flow 37 at the rear end of the branch channel 36. This makes it possible to ensure that the cleaning medium 28 flows through the entire branch channel 36 and to all electromagnetic valves 14 and through the cleaning nozzle 35 during a cleaning process.
  • an additional electromagnetic valve 38 is provided downstream of the branch channel 36.
  • the electromagnetic valve 38 be preferably located immediately before the associated cleaning nozzle 35 at the rear end of the branch channel 36 seen in the direction of flow 37.
  • the cleaning nozzles 35 and the associated electromagnetic valves 38 are preferably located in an upper region or at the upper end of the respective branch channel 36, so that when the electromagnetic valve 38 is open, the cleaning nozzle 35 is comparatively simple and can be reliably vented, especially if the printhead 1 1 is filled with cold glue 3 again.
  • the cleaning nozzles 35 preferably have a larger clear width than the spray nozzles 13.
  • the spray nozzles 13 preferably have a clear width of 100 to 400 pm and in particular 120 to 300 pm. In connection with the material-specific structural viscosity of the cold glue 3, this has proven particularly useful for targeted and reliable delivery of the cold glue 3.
  • the intrinsic viscosity of fluids is a fundamentally known material property of non-Newtonian fluids and states that the viscosity decreases with increasing shear stress in the fluid. This dependence is shown in FIG. 4 for the cold glue 3 as an interpolated rheological curve, which is preferably determined using a Brookfield rotation viscometer.
  • the abscissa shows the stirring speed n R of a standardized measuring body, for example an LV measuring body according to ISO 1652, and the ordinate shows a viscosity h of the cold glue 3 measured by a rotary viscometer.
  • the viscosity h measured at a stirring speed n R of 100 / min is characteristic / representative of the flow behavior of the cold glue 3 under shear stress under working pressure 17 in the area of the printhead 11.
  • the viscosity h measured at a stirring speed n R of 10 / min is, for example, characteristic / representative of the flow behavior of the cold glue 3 at ambient pressure and without significant shear stress, i.e. after the cold glue 3 has been dispensed from the spray nozzles 13 and after striking a label 4.
  • n R are in principle suitable for characterizing the structural viscosity of the cold glue 3 with regard to shear stress in the print head 11 under working pressure 17 and / or after delivery from the spray nozzles 3.
  • a viscosity h of 0.02 to 0.5 Pa-s and in particular 0.05 to 0.2 Pa-s at a stirring speed n R of 100 / min have been found to be particularly suitable, and in each case a viscosity of at least 1, 5 times greater and in particular at least three times the viscosity h at a stirring speed n R of 10 / min.
  • the viscosity h is approximately 0.08 Pa-s at a stirring speed n R of 100 / min and approximately 0.3 Pa-s at a stirring speed n R of 10 / min. It has been found that the above-mentioned ranges of values characterize an intrinsic viscosity of the cold glue 3 and thus a flow behavior, which are equally well adapted to the requirements in the print head 11 and to the labels 4.
  • the spray nozzles 13 can continuously dispense cold glue 3 over a certain period of time as well as in variable ones Cycle ratios of the opening time to the closing period of the electromagnetic valves 14.
  • continuous glue beads are produced in a known manner on the labels 4 passing the print head 1 1.
  • interrupted glue beads / glue points can be generated. So with different glue images on the labels 4 can be generated by appropriately programmed control, so different two-dimensional patterns from glue beads and / or glue points. Such glue patterns are known in principle and are therefore not shown.
  • the working pressure 17 in the area of the print head 1 1 is generated by the glue supply 22, in particular with signal feedback from the pressure sensor 18.
  • the glue supply 22 comprises, for example, a pressurized storage container 22a for the cold glue 3 and / or a variably adjustable glue pressure generator 22b, for example a suitably controllable glue pump.
  • the glue pressure generator 22b is connected, for example, as a pressure stage between the storage container 22a and the print head 11. Adjustable glue pumps or the like are known in principle and are therefore not described in detail.
  • a filter (not shown) is preferably provided between the storage container 22a for the cold glue 3 and the print head 11, for example with a pore size of 25 ⁇ m.
  • a cover plate for liquid-tight covering of the spray nozzles 13 and protection against drying / drying of cold glue 3 and / or an intermediate cleaning station which can be positioned temporarily in front of the spray nozzles 13 (not in each case shown). This reliably prevents incrustation of glue residues in the area of the spray nozzles 13. For a cleaning process, the print head 11 could then be moved backwards or pivoted away to the side, for example, in order to attach the cover plate and / or the intermediate cleaning station to the print head 11.
  • the dispensing of cold glue 3 can be targeted at different transport speeds of the labels 4 through the working area of the print head 11 and / or be adapted to different glue patterns to be produced on the labels 4. This adjustment is possible without mechanical conversion work by programmed control of the print head 11 and in particular the electromagnetic valves 14.
  • the electromagnetic valves 14 enable comparatively short switching times of less than 200 ps and in particular less than 150 ps.
  • 4 glue points and / or glue beads of less than 1 mm length are possible.
  • the length of glue beads can be limited to 0.9 mm with a machine output of, for example, 72000 containers / hour and to only 0.6 mm with a machine output of 50,000 containers / hour. This enables equally economical, precise and flexibly adaptable spraying of the cold glue 3 onto the labels 4.
  • the electromagnetic valves 14 For a quick opening of the electromagnetic valves 14, they are briefly actuated with an increased voltage, for example by applying a first voltage of 40-60 V over 250-350 ps. Immediately afterwards, the first voltage is reduced to a second value of, for example, 10-20 V by the end of the respective glue bead, that is to say at least by half, in order to keep the electromagnetic valves 14 in the open state, but at the same time thermal overloading of the valves 14 existing coils to avoid.
  • a first voltage for example by applying a first voltage of 40-60 V over 250-350 ps.
  • the first voltage is reduced to a second value of, for example, 10-20 V by the end of the respective glue bead, that is to say at least by half, in order to keep the electromagnetic valves 14 in the open state, but at the same time thermal overloading of the valves 14 existing coils to avoid.
  • the glue supply 22 then preferably works as a closed glue system, that is to say with the exclusion of air and without recirculation of cold glue 3.
  • IBC containers with a capacity of 1000 l or standard containers for glue with a capacity of 33 l or the like are suitable as storage containers 22a for the cold glue 3 .
  • the pallet carousel 6 rotates continuously and removes a label 4 from the label magazine 7 for each vacuum pallet 5.
  • the cold glue 3 is removed from the assigned spray nozzles 3 by targeted activation of the electromagnetic valves 14 , as described, ejected in a controlled manner.
  • a predetermined glue pattern that is to say a two-dimensional pattern of glue beads and / or glue dots, is generated on the labels 4.
  • they are transferred directly to the containers 8 circulating on the container table 9 in a manner known per se. This results in an equally compact and flexibly adaptable to different container formats, label formats or the like labeling method and correspondingly operating labeling unit 1 / a correspondingly operating labeling machine 10.
  • the glue syringe 2 can be flexibly adapted to existing and / or changed production requirements by modular construction of its at least one print head 11 from the stacked / stacked print modules 12.

Landscapes

  • Labeling Devices (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé de pulvérisation d'une colle à froid (3) sur des étiquettes (4), un groupe d'étiquetage (1) pour des contenants (8) et une étiqueteuse (10) équipée de celui-ci. Selon ledit procédé, des étiquettes sont transportées à travers la zone de travail d'une tête d'impression (11) pourvue de buses de pulvérisation (13) disposées en grille et la colle à froid est distribuée des buses de pulvérisation sur les étiquettes. Du fait qu'une pression de travail de la colle à froid de 0,1 à 10 bar soit réglée pour la zone de la tête d'impression et qu'on commande la distribution de la colle à froid au moyen de soupapes électromagnétiques (14) associées individuellement aux buses de pulvérisation, il est possible d'augmenter la fiabilité du collage en particulier par rapport au système de buses piézoélectriques, de simplifier l'alimentation en colle et d'adapter l'étiquetage de manière flexible aux différentes exigences en ce qui concerne les étiquettes et les contenants à étiqueter.
EP19780203.6A 2018-11-27 2019-09-27 Procédé pour appliquer un adhésive froid sur des étiquettes et dispositif d'étiquettage pour recipients Active EP3887265B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018220354.7A DE102018220354A1 (de) 2018-11-27 2018-11-27 Verfahren zum Aufspritzen von Kaltleim auf Etiketten und Etikettieraggregat für Behälter
PCT/EP2019/076146 WO2020108826A1 (fr) 2018-11-27 2019-09-27 Procédé de pulvérisation d'une colle à froid sur des étiquettes et groupe d'étiquetage pour des contenants

Publications (3)

Publication Number Publication Date
EP3887265A1 true EP3887265A1 (fr) 2021-10-06
EP3887265B1 EP3887265B1 (fr) 2024-03-13
EP3887265C0 EP3887265C0 (fr) 2024-03-13

Family

ID=68109300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19780203.6A Active EP3887265B1 (fr) 2018-11-27 2019-09-27 Procédé pour appliquer un adhésive froid sur des étiquettes et dispositif d'étiquettage pour recipients

Country Status (4)

Country Link
EP (1) EP3887265B1 (fr)
CN (1) CN216509696U (fr)
DE (1) DE102018220354A1 (fr)
WO (1) WO2020108826A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111842017A (zh) * 2020-06-29 2020-10-30 中山市优梦自动化设备有限公司 一种喷嘴自动安装点胶结构
DE102020124411A1 (de) 2020-09-18 2022-03-24 Krones Aktiengesellschaft Leimdrucker für Etikettieraggregat
DE102020124403A1 (de) 2020-09-18 2022-03-24 Krones Aktiengesellschaft Verfahren zum Beleimen eines Etiketts in einer Etikettiermaschine, computerlesbares Medium und Etikettiermaschine zum Aufbringen von Etiketten auf Behältern
EP3978142B1 (fr) 2020-10-02 2022-12-14 Jesús Francisco Barberan Latorre Système et procédé permettant d'appliquer des colles adhésives au moyen de têtes d'impression à jet d'encre numériques
DE102020130533A1 (de) 2020-11-19 2022-05-19 Krones Ag Verfahren und Vorrichtung zum Etikettieren von Behältern
DE102022107639A1 (de) 2022-03-31 2023-10-05 Krones Aktiengesellschaft Vorrichtung und Verfahren zum Strahlauftrag von Kaltleim auf Etiketten oder auf Paletten zum Transport der Etiketten
DE102022122986A1 (de) 2022-09-09 2024-03-14 KIC KRONES Internationale Cooperationsgesellschaft mbH Verfahren zur Modifikation eines Klebstoffes, insbesondere im laufenden Betrieb einer Etikettiervorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7771556B2 (en) * 2005-07-01 2010-08-10 Nordson Corporation Apparatus and process to apply adhesive during labeling operations
US9186695B2 (en) * 2010-04-01 2015-11-17 B&H Manufacturing Company, Inc. Extrusion application system
DE102015212136A1 (de) 2015-06-30 2017-01-05 Krones Ag Vorrichtung und Verfahren zum Etikettieren von Behältern
US9789645B2 (en) * 2016-01-26 2017-10-17 Elum Inc. Glue delivery system
DE102016207824A1 (de) 2016-05-06 2017-11-09 Krones Ag Etikettiermaschine für Behälter
DE102017206114A1 (de) * 2017-04-10 2018-10-11 Krones Ag Kaltleimaggregat für Etiketten und Reinigungsverfahren für das Kaltleimaggregat

Also Published As

Publication number Publication date
EP3887265B1 (fr) 2024-03-13
EP3887265C0 (fr) 2024-03-13
CN216509696U (zh) 2022-05-13
DE102018220354A1 (de) 2020-05-28
WO2020108826A1 (fr) 2020-06-04

Similar Documents

Publication Publication Date Title
EP3887265B1 (fr) Procédé pour appliquer un adhésive froid sur des étiquettes et dispositif d'étiquettage pour recipients
EP3854712A1 (fr) Procédé de pulvérisation de colle froide sur les palettes pour étiquettes et unité d'étiquetage pour récipients
EP2331338B1 (fr) Dispositif pour appliquer de multiples impressions sur un matériau d'emballage
EP2153998B1 (fr) Système d'alimentation en encre et procédé de nettoyage d'un tel système d'alimentation en encre
DE68907122T2 (de) Auf Abruf arbeitender Druckkopf.
DE102009020702A1 (de) Drucksystem zum Bedrucken von Flaschen oder dergleichen Behältern sowie Druckvorrichtung oder -maschine mit einem solchen Drucksystem
DE102009013477A1 (de) Druckvorrichtung zum Bedrucken von Flaschen oder dergleichen Behältern
EP2029442A1 (fr) Procédé et dispositif pour l'impression de récipients
DE102015215227A1 (de) Behälterbehandlungsmaschine und Verfahren zur Bedruckung von Behältern
DE102018006397A1 (de) Verfahren zum Herstellen eines dreidimensionalen Formgegenstands mittels schichtweisem Materialauftrag
DE60303879T2 (de) Verfahren zur Kontrolle eines Tintenstrahldruckers, Tintenstrahldruckkopf für dieses Verfahren und Tintenstrahldrucker und mit solchem Druckkopf versehener Tintenstrahldrucker
WO2007124913A1 (fr) Procédé de préparation d'emballages lors de l'emballage d'un matériau de remplissage ou d'emballage et dispositif de mise en œuvre du procédé
EP3681724B1 (fr) Machine d'impression directe pour l'application d'une couche d'impression sur des récipients
DE19859436A1 (de) Digitale Farbdosierung
EP1586381B1 (fr) Tête d'application pour produire un film liquide
DE60120317T2 (de) Tintenstrahldüsenstruktur zur Verminderung des Tropfenpositionierungfehlers
DE102015215224A1 (de) Behälterbehandlungsmaschine und Verfahren zur Bedruckung von Behältern
EP3450179B1 (fr) Machine et procédé d'impression directe destinés à l'impression de récipients par impression directe
EP2948382B1 (fr) Dispositif pour etaler un liquide sur un substrat
DE102015220287A1 (de) Direktdruckverfahren und Behälterbehandlungsmaschine zur Bedruckung einer Vielzahl von gleichartigen Behältern
DE102006004477A1 (de) Tintenstrahldruckkopf mit Abdeckeinrichtung für die Düse/n
DE10228849A1 (de) Mikroinjektor zum Ausstossen von Tröpfchen unterschiedlicher Grösse
WO2002040280A1 (fr) Procede et dispositif d'orientation de tetes d'impression
WO2016177486A1 (fr) Dispositif d'étiquetage de produits individuels
DE60008598T2 (de) Druckmaske für Hochgeschwindigkeits-Tintenstrahldrucken

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210122

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

RIC1 Information provided on ipc code assigned before grant

Ipc: B05B 12/04 20060101ALI20230830BHEP

Ipc: B05B 1/30 20060101ALI20230830BHEP

Ipc: B65C 9/22 20060101AFI20230830BHEP

INTG Intention to grant announced

Effective date: 20230925

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502019010813

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

U01 Request for unitary effect filed

Effective date: 20240409

U07 Unitary effect registered

Designated state(s): AT BE BG DE DK EE FI FR IT LT LU LV MT NL PT SE SI

Effective date: 20240417

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240614

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240313

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240613

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20240313