EP3887265B1 - Procédé pour appliquer un adhésive froid sur des étiquettes et dispositif d'étiquettage pour recipients - Google Patents

Procédé pour appliquer un adhésive froid sur des étiquettes et dispositif d'étiquettage pour recipients Download PDF

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Publication number
EP3887265B1
EP3887265B1 EP19780203.6A EP19780203A EP3887265B1 EP 3887265 B1 EP3887265 B1 EP 3887265B1 EP 19780203 A EP19780203 A EP 19780203A EP 3887265 B1 EP3887265 B1 EP 3887265B1
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EP
European Patent Office
Prior art keywords
glue
labels
print head
cold glue
spray nozzles
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
EP19780203.6A
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German (de)
English (en)
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EP3887265C0 (fr
EP3887265A1 (fr
Inventor
Heinrich Bielmeier
Stefan Poeschl
Florian HABERSETZER
Andreas Kursawe
Christian Stoiber
Hartmut Davidson
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Krones AG
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Krones AG
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Publication date
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Publication of EP3887265C0 publication Critical patent/EP3887265C0/fr
Publication of EP3887265B1 publication Critical patent/EP3887265B1/fr
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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 onto labels according to the preamble of claim 1 and a labeling unit for containers according to the preamble of claim 8.
  • Labeling units with rotating vacuum pallets are known, which remove labels from a label magazine, transport them through the work area of a glue syringe for applying cold glue and hand over the labels glued in this way directly to containers to be labeled.
  • Printheads were proposed for the glue syringes, which eject the cold glue using piezo elements at comparatively high working pressures of around 40 bar.
  • the cold glue used for this has a comparatively high viscosity, for example between 20 and 200 Pa s.
  • the task is solved using a method according to claim 1. Accordingly, this is used for spraying cold glue onto labels, especially 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 pattern, and the cold glue is dispensed onto the labels from 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 delivery of the cold glue is controlled using electromagnetic valves individually assigned to the spray nozzles.
  • a working pressure in the area of the print head means that the cold glue is held and/or transported in the print head at the working pressure and in particular is applied to the electromagnetic valves under working pressure.
  • the pressure range specified above is particularly advantageous for efficient glue supply and reliable operation of electromagnetic valves, but in principle could also be expanded upwards.
  • Piezo-driven valves could in principle also be used at the specified pressure values, but are inferior to electromagnetic valves according to the invention, particularly 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 using spring tension.
  • the cold glue is preferably structurally viscous such 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 at least three times.
  • This enables optimization of the flow properties of the cold glue in the area of the print head and especially in the area of the electromagnetic valves and spray nozzles.
  • the specified structural viscosity allows the cold glue to become so viscous after being dispensed from the spray nozzles at ambient pressure that it adheres to the essentially upright transported labels at the point of impact and does not run down.
  • the cold glue can be dispensed particularly reliably and precisely and predetermined glue patterns, i.e. patterns of glue beads, produced.
  • glue dots or the like given on the labels.
  • the viscosity values given above are particularly practical for common container labeling applications, but could in principle be changed for special applications and/or printheads.
  • structural viscosity means that the viscosity of the cold glue decreases with increasing shear stress and thus with increasing working pressure.
  • the stirring speed refers to a rotational viscometer and in particular to a Brookfield viscosity measurement.
  • the viscosity of the cold glue is preferably measured according to ISO 1652, i.e. using standardized LV measuring bodies.
  • the cold glue falls into the range of low-viscosity non-Newtonian fluids.
  • the above measurement method is the standard measurement method, but could also be replaced by other measurement methods.
  • the cold glue has a viscosity of 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 cold glue is dispensed by changing the working pressure and/or a cycle ratio for opening/closing the electromagnetic valves, i.e. a cycle ratio of the opening time to the closing time of the valves, and/or a degree of opening of the electromagnetic valves to a transport speed of the labels in the area of the print head and/or adapted to a glue pattern to be produced on the labels.
  • a cycle ratio for opening/closing the electromagnetic valves i.e. a cycle ratio of the opening time to the closing time of the valves, and/or a degree of opening of the electromagnetic valves to a transport speed of the labels in the area of the print head and/or adapted to a glue pattern to be produced on the labels.
  • a cycle ratio for opening/closing the electromagnetic valves i.e. a cycle ratio of the opening time to the closing time of the valves, and/or a degree of opening of the electromagnetic valves to a transport speed of the labels in the area of the print head and/or adapted to
  • the glue supply 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 print head.
  • the working pressure is preferably monitored in the print head upstream of the electromagnetic valves.
  • the working pressure can then be regulated depending on the transport speed of the labels in order to set the amount of glue dispensed 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 dots with gaps in between without glue application. This is particularly suitable for spraying a predetermined amount of glue onto labels at low transport speeds, for example when setting up the labeling unit.
  • valves are controlled, for example, using pulse width modulated signals so that the electromagnetic valves only open incompletely. Controlling the electromagnetic valves in this way reduces the opening cross section of the electromagnetic valves gradually compared to the fully open position, so that less glue can pass through.
  • the opening cross section can, for example, be gradually increased as the transport speed of the labels increases.
  • the cold glue is dispensed from the spray nozzles in a spray direction that deviates from the horizontal by a maximum of 30° and in particular a maximum of 10°.
  • the spray direction is understood to mean a main spray direction of the individual glue jets, i.e. their orientation.
  • the labels are preferably moved from the pallets in an orthogonally upright position through the work area of the glue sprayer. Accordingly, dispensing the cold glue from the spray nozzles horizontally or deviating in the specified area simplifies the creation of predetermined glue patterns on the labels passing in this way.
  • the specified structural viscosity of the cold glue means that the cold glue that hits the labels does not run down significantly from the respective point of impact.
  • the labels are removed from a label magazine by continuously rotating vacuum pallets, and the labels sprayed with cold glue according to at least one of the embodiments described above 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 controlled intermittently to open with a first voltage, which is in particular 40-60 V, and are then kept open, in particular until they close, with a second voltage that is reduced by at least half, for example until End of individual glue beads/glue dots.
  • a first voltage which is in particular 40-60 V
  • a second voltage that is reduced by at least half, for example until End of individual glue beads/glue dots.
  • the signal exchange preferably takes place between a microprocessor that controls the glue delivery and the driver units assigned to the electromagnetic valves via a data interface using a shift register. In principle, however, direct wiring would also be conceivable.
  • the task is also solved with a labeling unit according to claim 8. Accordingly, this serves for labeling containers and in particular for carrying out the method according to at least one of the embodiments described above.
  • the labeling unit includes a glue syringe for spraying cold glue onto labels, a glue supply for providing the cold glue under excess pressure, at least one print head connected to it with spray nozzles arranged in a grid pattern for dispensing the cold glue and a transport means 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 with which the delivery of cold glue from the spray nozzles can be individually controlled. This allows the advantages described in claim 1 to be achieved.
  • the spray nozzles preferably have a clear width of 100 to 400 ⁇ m and in particular 120 to 300 ⁇ m. Such opening cross sections have proven to be particularly advantageous for targeted processing of the cold glue in the specified ranges of working pressure and viscosity of the cold glue.
  • the print head comprises print modules arranged one above the other, each with spray nozzles arranged in a line, the print modules being in particular stackable directly on top of one another.
  • the pressure modules each combine a similar number of spray nozzles in the form of modules that can be flexibly combined with one another.
  • each printing module includes six to twelve spray nozzles and in particular eight to ten spray nozzles.
  • Each pressure module/component 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 constructed modularly with uniform basic components depending on requirements, such as the height of the labels. This serves to flexibly adapt the print heads to different operating conditions and enables economical construction of differently sized print heads.
  • the printing modules are preferably positioned obliquely with respect to the transport direction of the labels and in particular at an angle of 10 to 20°. Due to the installation space required for the associated electromagnetic valves, the spray nozzles cannot be as narrow as desired be placed together. Gaps caused by this can be closed by tilting the pressure 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 can therefore cover a total of 16 mm label height. Accordingly, print heads could be modularly adapted in steps of 16 mm to different label heights or to the heights of required glue images.
  • the pressure modules are preferably connected in parallel to the glue supply via a distribution chamber on the print head, with 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. This allows you to regulate the working pressure and thus also the viscosity of the cold glue in the area of the print head. Furthermore, the cold glue has reproducible flow behavior even at different ambient temperatures.
  • the distribution chamber could also function as a pressure equalization container between the glue supply and the constantly switching electromagnetic valves.
  • the pressure modules preferably include branch channels for connecting the spray nozzles to the distribution chamber, whereby the ends of the branch channels can 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 assigned spray nozzles.
  • the branch channels and the inlets of the electromagnetic valves can then be effectively flowed through/at which a cleaning medium flows. These areas can therefore be cleaned together by machine without dismantling. This simplifies cleaning of the print head and ensures long-term, reliable and reproducible cold glue delivery.
  • 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 obliquely from bottom to top in accordance with the inclination of the pressure modules in the flow direction, so that the cleaning nozzles are arranged essentially at the upper end of the branch channels. Accordingly, after cleaning, the branch channels can be ventilated reliably and easily through the cleaning nozzles when cold glue is introduced again.
  • Their larger cross-section compared to the spray nozzles enables efficient and quick cleaning of the print head.
  • the labeling unit further comprises a switching valve arranged between the glue supply and the print head for selectively supplying cold glue or cleaning medium to the print head.
  • a switching valve arranged between the glue supply and the print head for selectively supplying cold glue or cleaning medium to the print head.
  • This allows automatic cleaning to be carried out downstream of the switching valve, in particular including all components of the print head.
  • all you have to do is shut off the glue supply from the glue supply and open the supply of a cleaning medium, such as a cleaning liquid.
  • a cleaning medium such as a cleaning liquid.
  • drying of glue residues downstream of the changeover valve can be avoided. All critical areas in this regard, especially in the print head, can be rinsed in a simple and practical way, for example.
  • the means of transport is preferably a pallet carousel with vacuum pallets for removing the labels from a label magazine and for directly transferring the glued labels to the containers.
  • the vacuum pallets enable easy and reliable controllable removal of the labels and transfer of the glued labels to the containers without reaching around, i.e. without a gripper cylinder or similar unit for turning the labels before handing them over to the containers.
  • the labeling unit is part of a labeling machine, which includes a continuously rotating container table for receiving and positioning the containers when the labels are transferred.
  • the containers can be adjusted in a known manner by turntables with regard to their rotational position and moved appropriately.
  • the labeling unit 1 comprises a glue syringe 2 for spraying cold glue 3 onto labels 4, which are transported by vacuum pallets 5, which continuously rotate on a pallet carousel 6, in a transport direction 4a through the working area of the glue syringe 2.
  • 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 pallets 5 transfer the labels 4 sprayed with cold glue 3 directly, i.e. without reaching around, to containers 8 to be labeled, which rotate in a manner known in principle on a container table 9 (indicated by a partial circle) of a labeling machine 10.
  • the glue syringe 2 comprises at least one printing head 11 with a plurality of printing modules 12 arranged tiered one above the other and in particular stacked on top of one another.
  • the printing modules 12 are preferably identical.
  • Each printing module 12 includes spray nozzles 13 arranged in a grid pattern and in particular in a row 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 include, for example, a spring-loaded 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, if necessary only to open it incompletely in an intermediate position.
  • the electromagnetic drive When the electromagnetic drive is switched off, the electromagnetic valve 14 preferably closes automatically due to the spring preload. In principle, an actively driven closure for the electromagnetic valve 14 would also be conceivable.
  • Each pressure module 12 includes 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, for example between 3 and 12 V are.
  • the pressure modules 12 share a distribution chamber 16 on the input side for the cold glue 3 in order to keep it at a predetermined working pressure 17 for all pressure modules 12 and thus for all electromagnetic valves 14 and associated spray nozzles 13.
  • a pressure sensor 18 is preferably present 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 basically comprises known components, for example at least one heating element and a temperature sensor.
  • control unit 21 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 area of the distribution chamber 16 are adjusted so that the cold glue 3 in the print head 11 and in particular on the electromagnetic valves 14 has a working viscosity 23 of preferably 0.1 and 2 Pa s has.
  • 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 printing 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 pressure modules 12 with their driver units 15 and electromagnetic valves 14 can be present on the connection board 24.
  • the signal exchange of the microprocessor 25 with the respective driver unit 15 and the electromagnetic valves 14 connected to it can take place both via direct wiring and/or preferably via a data interface using a shift register.
  • the housing 26 is preferably designed to slope obliquely on its upper side, so that any contamination that may be present can run off the print head 11, specifically away from its front side with the spray nozzles 13, for example towards Back towards or to the side, as in the Figure 3 is indicated schematically.
  • a switching valve 27 which is connected between the glue supply 22 and the print head 11 in order to shut off the glue supply 22 for cleaning the print head 11 and instead a cleaning medium 28 into the print head 11 and in particular through the distribution chamber 16, the electromagnetic valves 14 and to guide 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 released from the spray nozzles 13 in a spray direction 29 that deviates from the horizontal by an angle of at most 30 ° and in particular at most 10 °, in particular in the horizontal spray direction 29.
  • the Figure 3 shows the spray nozzles 13 arranged by stacking printing modules 12 in the form of a two-dimensional grid. Accordingly, the printing modules 12 and the rows of nozzles formed by their spray nozzles 13 are preferably at an angle of attack 30 of 10 ° to 20 ° with respect to the transport direction 4a of the labels 4, in the normal case thus inclined with respect to the horizontal.
  • the entire nozzle head 11 can be inclined by the angle of attack 30 relative to the transport direction 4a of the labels 4.
  • the pressure modules 12 and associated components obliquely with respect to a conventionally essentially orthogonally aligned housing 26 at the angle of attack 30.
  • each spray nozzle 13 produces a glue application on the label 4 with a line height 32 that depends 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 appropriately adjusting the angle of attack 30.
  • the vertical working area 33 results in the ideal case, i.e. at an optimal angle of attack 30, by adding the line heights 32 of all spray nozzles 13 of a specific pressure module 12.
  • connection board 24 preferably has several 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.
  • the Figure 3 further indicates schematically 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 distribution chamber 16 via a common branch channel 36.
  • the cleaning nozzle 35 is then arranged at the rear end of the branch channel 36 as seen in the flow direction 37. This ensures that the cleaning medium 28 flows through the entire branch channel 36 and to all electromagnetic valves 14 as well as through the cleaning nozzle 35 during a cleaning process.
  • an additional electromagnetic valve 38 is present downstream of the branch channel 36.
  • the electromagnetic valve 38 is preferably located directly in front of the associated cleaning nozzle 35 at the rear end of the branch channel 36, viewed in the flow direction 37.
  • the cleaning nozzles 35 and the associated electromagnetic valves 38 are preferably located in an upper area or at the upper end of the respectively assigned branch channel 36, so that this can be moved through the cleaning nozzle 35 comparatively easily and reliably when the electromagnetic valve 38 is open can be vented, especially when the print head 11 is filled again with cold glue 3.
  • 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 ⁇ m and in particular of 120 to 300 ⁇ m.
  • the structural viscosity of fluids is a fundamentally known material property of non-Newtonian fluids and states that the viscosity decreases as the shear stress in the fluid increases.
  • This dependency is in the Figure 4 for the cold glue 3 is shown as an interpolated rheological curve, which is preferably determined using a rotational viscometer according to the Brookfield method.
  • 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 ⁇ of the cold glue 3 measured by a rotational viscometer.
  • the viscosity ⁇ 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 print head 11.
  • the viscosity ⁇ 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 hitting a label 4.
  • stirring speeds 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 ⁇ 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 has proven to be particularly suitable, as well as a viscosity of at least 1, 5 times greater and in particular at least three times greater viscosity ⁇ at a stirring speed n R of 10/min.
  • the viscosity ⁇ 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 value ranges 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 on the labels 4.
  • the spray nozzles 13 can deliver cold glue 3 continuously over a certain period of time as well as in a variable manner Cycle ratios of the opening time to the closing time of the electromagnetic valves 14.
  • the cold glue 3 is continuously dispensed, continuous glue beads are created in a known manner on the labels 4 running past the print head 11. Accordingly, depending on the cycle time, glue beads/glue dots interrupted by gaps can be generated.
  • glue patterns can be created on the labels 4 using appropriately programmed controls, i.e. different two-dimensional patterns of glue beads and/or glue dots. Such glue patterns are known in principle and are therefore not shown.
  • the working pressure 17 in the area of the print head 11 is generated by the glue supply 22, in particular with signal feedback from the pressure sensor 18.
  • the glue supply 22 includes, 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), for example with a pore size of 25 ⁇ m, is preferably present between the storage container 22a for the cold glue 3 and the print head 11.
  • an additional pressure compensation container can optionally be present, for example at the entrance to the print head 11, in order to mitigate pressure peaks caused by the comparatively rapid opening and closing of the electromagnetic valves 14.
  • the print head 11 On the front of the print head 11, i.e. in the area of the spray nozzles 13, there is preferably a cover plate for liquid-tight covering of the spray nozzles 13 and protection against drying out / drying of cold glue 3 and / or an intermediate cleaning station that can be temporarily positioned in front of the spray nozzles 13 (not shown in each case). .
  • This makes it possible to reliably prevent glue residue from becoming encrusted in the area of the spray nozzles 13.
  • the print head 11 could then, for example, be moved backwards or pivoted away to the side in order to attach the cover plate and/or the intermediate cleaning station to the print head 11.
  • the delivery 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 can be adapted to different glue patterns to be produced on the labels 4.
  • Corresponding adjustments in the event of a change of type/format can be carried out fully automatically, as can cleaning processes that may need to be carried out using cleaning media 28.
  • the electromagnetic valves 14 enable comparatively short switching times of less than 200 ⁇ s and in particular less than 150 ⁇ s. Depending on the transport speed of the labels, this makes it possible to have 4 glue dots and/or glue beads less than 1 mm long. With the above valve switching times, the length of glue beads can be limited to 0.9 mm with a machine output of, for example, 72,000 containers/hour, and to just 0.6 mm with a machine output of 50,000 containers/hour. This enables the cold glue 3 to be sprayed onto the labels 4 in an equally economical, precise and flexibly adaptable manner.
  • the electromagnetic valves 14 To quickly open the electromagnetic valves 14, they are briefly activated with an increased voltage, for example by applying a first voltage of 40-60 V over 250-350 ⁇ s. Immediately afterwards, the first voltage is reduced to a second value of, for example, 10-20 V up to the end of the respective glue bead, i.e. at least by half, in order to keep the electromagnetic valves 14 in the open state, but at the same time prevent thermal overloading of the valves 14 existing coils to avoid.
  • a first voltage 40-60 V over 250-350 ⁇ s.
  • the first voltage is reduced to a second value of, for example, 10-20 V up to the end of the respective glue bead, i.e. at least by half, in order to keep the electromagnetic valves 14 in the open state, but at the same time prevent thermal overloading of the valves 14 existing coils to avoid.
  • the glue supply 22 then preferably works as a closed glue system, i.e. in the absence of air and without the return of unapplied cold glue 3.
  • Suitable storage containers 22a for the cold glue 3 are, for example, IBC containers with a capacity of 1000 l or standard containers for glue with a capacity of 33 l or the like .
  • 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 released from the assigned spray nozzles 3 by targeted control of the electromagnetic valves 14 described, released in a controlled manner. This creates a predetermined glue pattern on the labels 4, i.e. a two-dimensional pattern of glue beads and/or glue dots.
  • the glue syringe 2 can be flexibly adapted to existing and/or changed production requirements through the modular design of its at least one printing head 11 from the printing modules 12 arranged/stacked one above the other.

Landscapes

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

Claims (17)

  1. Procédé de pulvérisation d'une colle à froid (3) sur des étiquettes (4), en particulier au sein d'une étiqueteuse (10) destinée à des récipients (8), dans lequel les étiquettes (4) sont transportées à travers la zone de travail d'une tête d'impression (11) munie de buses de pulvérisation (13) agencées selon une trame et la colle à froid (3) est alors distribuée par les buses de pulvérisation (13) sur les étiquettes (4), caractérisé en ce qu'une pression de travail (17) de la colle à froid (3) est ajustée entre 0,1 à 10 bars pour la zone de travail de la tête d'impression (11), et la distribution de la colle à froid (3) est commandée au moyen de soupapes électromagnétiques (14) associées individuellement aux buses de pulvérisation (13).
  2. Procédé selon la revendication 1, dans lequel la colle à froid (3) présente une viscosité structurelle telle que sa viscosité (η) à une vitesse d'agitation (nR) de 100/min est comprise entre 0,02 et 0,5 Pa•s et de manière particulièrement préférée entre 0,05 et 0,2 Pa•s et est encore supérieure d'un facteur 1,5 à une vitesse d'agitation (nR) de 10/min.
  3. Procédé selon la revendication 1 ou 2, dans lequel la distribution de la colle à froid (3) est adaptée par modification de la pression de travail (17) et/ou d'un rapport cyclique de la durée d'ouverture sur la durée de fermeture des soupapes électromagnétiques (14) et/ou d'un degré d'ouverture des soupapes électromagnétiques (14) pour une vitesse de transport des étiquettes (4) dans la zone de travail de la tête d'impression (11) et/ou pour une image de colle à produire sur les étiquettes (4).
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel la colle à froid (3) est distribuée par les buses de pulvérisation (13) dans une direction de pulvérisation (29) s'écartant de l'horizontale d'au plus 30° et de manière particulièrement préférée d'au plus 10°.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel les soupapes électromagnétiques (14) sont respectivement commandées pour s'ouvrir avec une première tension, qui est de manière particulièrement préférée comprise entre 40 et 60 V, et sont maintenues ouvertes, en particulier jusqu'à leur fermeture respective, avec une deuxième tension réduite au moins de moitié par rapport à la première tension.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel un échange de signaux entre un microprocesseur (25) commandant la distribution de colle et les unités de commande (15) respectivement associées aux soupapes électromagnétiques (14) survient au moyen de registres à décalage et en passant par une interface de données.
  7. Procédé d'étiquetage de récipients (8), dans lequel les étiquettes (4) sont retirées d'un magasin d'étiquettes (7) par des palettes à vide (5) circulant en continu et les étiquettes (4) aspergées de colle à froid (3) conformément au procédé selon au moins l'une quelconque des revendications précédentes sont transférées directement sur les récipients (8) par les palettes à vide (5).
  8. Unité d'étiquetage (1) destinée à des récipients (8), en particulier permettant de mettre en oeuvre le procédé selon au moins l'une quelconque des revendications précédentes, comprenant un injecteur à colle (2) permettant de pulvériser de la colle à froid (3) sur des étiquettes (4), une alimentation en colle (22) permettant de préparer la colle à froid (3) en surpression dans une tête d'impression (11) située au niveau de l'injecteur à colle (2) et munie de buses de pulvérisation (13) agencées selon une trame afin de distribuer la colle à froid (3), et comprenant un moyen de transport permettant de transporter les étiquettes (4) à travers la zone de travail de la tête d'impression (11), caractérisée en ce que l'alimentation en colle (22) présente un générateur de pression de colle pouvant être ajusté de manière variable et est conçue pour une pression de travail (17) comprise entre 0,1 et 10 bars au sein de la tête d'impression (11) et la tête d'impression (11) comprend des soupapes électromagnétiques (14) avec lesquelles la distribution de la colle à froid (3) à partir des buses de pulvérisation (13) peut être commandée de manière individuelle.
  9. Unité d'étiquetage selon la revendication 8, dans laquelle les buses de pulvérisation (13) présentent une largeur libre comprise entre 100 et 400 µm.
  10. Unité d'étiquetage selon la revendication 8 ou 9, dans laquelle la tête d'impression (11) comprend des modules d'impression (12) superposés avec des buses de pulvérisation (13) respectivement agencées en ligne, et dans laquelle les modules d'impression (12) peuvent être de manière particulièrement préférée empilés les uns sur les autres.
  11. Unité d'étiquetage selon la revendication 10, dans laquelle les modules d'impression (12) sont agencés en biais par rapport à la direction de transport (4a) des étiquettes (4) et de manière particulièrement préférée avec un angle d'incidence (30) compris entre 10 et 20°.
  12. Unité d'étiquetage selon la revendication 10 ou 11, dans laquelle les modules d'impression (12) sont raccordés en parallèle à l'alimentation en colle (22) par l'intermédiaire d'une chambre de distribution (16) située au niveau de la tête d'impression (11) et un capteur de pression (18) et/ou une unité de régulation de température (20) permettant de réguler la température de la colle à froid (3) est/sont agencé(s) sur/dans la chambre de distribution (16) afin de mesurer la pression de travail (17).
  13. Unité d'étiquetage selon l'une quelconque des revendications 10 à 12, dans laquelle les modules d'impression (12) comprennent des canaux de coulée (36) permettant de raccorder les buses de pulvérisation (13) à la chambre de distribution (16) et les extrémités des canaux de coulée (36) peuvent être reliées, de manière commandée par des soupapes électromagnétiques (38), à des buses de nettoyage (35) agencées dans la région des buses de pulvérisation (13).
  14. Unité d'étiquetage selon la revendication 13, dans laquelle les buses de nettoyage (35) présentent une section transversale de taille supérieure à celle des buses de pulvérisation (13) et/ou sont agencées dans une région supérieure des canaux de coulée (36) de telle manière qu'elles peuvent être ventilées par les buses de nettoyage (35).
  15. Unité d'étiquetage selon au moins l'une quelconque des revendications 8 à 14, comprenant en outre une soupape de commutation (27) agencée entre l'alimentation en colle (22) et la tête d'impression (11) et permettant un acheminement sélectif de la colle à froid (3) ou d'un agent de nettoyage (28) vers la tête d'impression (11).
  16. Unité d'étiquetage selon au moins l'une quelconque des revendications 8 à 15, dans laquelle le moyen de transport est un carrousel à palettes (6) muni de palettes à vide (5) permettant de retirer les étiquettes (4) d'un magasin d'étiquettes (7) et est conçu pour transférer directement les étiquettes (4) enduites de colle sur les récipients (8).
  17. Étiqueteuse (10) munie de l'unité d'étiquetage selon au moins l'une quelconque des revendications 8 à 16 et d'une table à récipients (9) pouvant tourner de manière continue et permettant de recevoir et positionner les récipients (8) lors du transfert des étiquettes (4).
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

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EP3887265A1 EP3887265A1 (fr) 2021-10-06
EP3887265C0 EP3887265C0 (fr) 2024-03-13
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CN (1) CN216509696U (fr)
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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
PL3978142T3 (pl) 2020-10-02 2023-06-05 Jesús Francisco Barberan Latorre System i sposób nanoszenia klejów adhezyjnych za pomocą głowic do cyfrowego drukowania strumieniowego
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

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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

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DE102018220354A1 (de) 2020-05-28
WO2020108826A1 (fr) 2020-06-04
EP3887265A1 (fr) 2021-10-06
CN216509696U (zh) 2022-05-13

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