EP2982608A1 - Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln - Google Patents

Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln Download PDF

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Publication number
EP2982608A1
EP2982608A1 EP14180227.2A EP14180227A EP2982608A1 EP 2982608 A1 EP2982608 A1 EP 2982608A1 EP 14180227 A EP14180227 A EP 14180227A EP 2982608 A1 EP2982608 A1 EP 2982608A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
axis
scraper
labels
roller
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
EP14180227.2A
Other languages
English (en)
French (fr)
Other versions
EP2982608B1 (de
Inventor
James Carmichael
Marco Ferri
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.)
Sidel SpA
Original Assignee
Sidel SpA
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Filing date
Publication date
Application filed by Sidel SpA filed Critical Sidel SpA
Priority to EP14180227.2A priority Critical patent/EP2982608B1/de
Publication of EP2982608A1 publication Critical patent/EP2982608A1/de
Application granted granted Critical
Publication of EP2982608B1 publication Critical patent/EP2982608B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B65C9/2247—Gluing the labels or articles by wetting, e.g. by applying liquid glue or a liquid to a dry glue coating using liquid rollers or bands
    • B65C9/2269—Means for controlling the liquid film on the rollers
    • 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
    • B65C2009/0071—Details of glueing devices
    • B65C2009/0078—Constructional details of doctor blades

Definitions

  • the present invention relates to an application unit and to a method for applying adhesive onto labels to be applied onto respective articles.
  • Labelling machines are known, for example from the European patent application no. 12199786 in the name of the same Applicant,which substantially comprise:
  • the labelling group substantially comprises:
  • the known application unit comprises, in turn,:
  • the adhesive scraper is arranged downstream of the adhesive distributor with reference to the advancing rotation direction of the adhesive roller about its own axis.
  • the final thickness of the adhesive on the outer surface of the adhesive roll substantially corresponds to the radial distance between the adhesive scraper and the lateral surface of the adhesive roller.
  • each previously cut label contacts, on the opposite side thereof with respect to the transfer drum, the adhesive roller.
  • the mechanical adjustment adjusts the radial distance between the adhesive scraper and the lateral surface of the adhesive roller.
  • the amount of adhesive to be eventually applied on the labels is controlled by simply adjusting the radial distance between the adhesive scraper and the outer surface of the adhesive roller.
  • the Applicant has found that, in some operative conditions, the amount of adhesive which passes between the adhesive scraper and the adhesive roller cannot be controlled precisely and in a repeatable way, by simply controlling the radial distance between the adhesive scraper and the lateral surface of the adhesive roller.
  • the viscosity of the adhesive renders the required amount of the adhesive highly variable according to many not-completely predictable factors, e.g. type of the adhesive substance, material of the label, roughness of the lateral surface of the adhesive roller, contamination of the lateral surface of the adhesive roller, profile of the lateral surface of the adhesive roller, the stresses and temperature of the adhesive.
  • the rotational speed of the adhesive roller also has a considerable effect on the amount of adhesive, which passes between the adhesive roller and the adhesive scraper.
  • the adhesive scrapers and the adhesive roller are generally made respectively of relatively soft material like brass and relatively hard material like steel.
  • the adhesive scrapers and the adhesive roller tend to damage and/or wear out the surface of the adhesive roller, thus requiring costly operation to upgrade the surface of the adhesive roller and subsequently costly tests to verify the correct operation of the application unit.
  • the aforementioned object is achieved by the present invention as it relates to an application unit for applying adhesive onto labels to be applied onto respective articles, as defined in claim 1.
  • the present invention also relates to a method for applying adhesive onto labels to be applied onto respective articles, as defined in claim 9.
  • the present invention also relates to an application unit for applying adhesive onto labels to be applied onto respective articles, as defined in claim 13.
  • the present invention also relates to an adhesive scraper for removing an excess of adhesive from an adhesive roller, as defined in claim 15.
  • Number 1 in Figure 1 indicates as a whole a labelling machine for applying labels 2 to respective articles 3, containers for pourable food product in the embodiment shown.
  • labelling machine 1 substantially comprises:
  • carousel 4 receives articles 3 to be labelled at an inlet station 7, conveys articles 3 along an arc-shaped path P having centre on axis A, and outputs labelled articles 3 at an output station 8.
  • Labelling group 5 comprises:
  • labelling group 5 comprises a transfer mechanism 13 rotating about an axis B for advancing, one after the other, each cut label 2 from cutting device 11 towards application station 6 ( Figure 1 ) and through application unit 12.
  • transfer mechanism 13 contacts a first side of each label 2.
  • transfer mechanism 13 comprises a drum 14 (shown only in Figure 2 ), which retains the first side of cut label 2 by means of vacuum applied onto such a cut label 2.
  • Axis B is parallel to axis A and vertical in the embodiment shown.
  • Application unit 12 comprises, in turn, ( Figure 2 ):
  • surface 21 of rollers 20 contacts and apply the adhesive on a second side, opposite to the first side, of each cut label 2.
  • Scraper 23 is arranged downstream of distributor 22, with reference to the rotation direction of roller 20 about axis C.
  • scraper 23 is angularly fixed with respect to axis C.
  • scraper 23 is in made of plastic material, peek or PTFE or inert plastic in the embodiment shown.
  • Area 26 is arranged downstream of area 25 and of distributor 22, proceeding according to the advancing rotation direction of roller 20 about axis C.
  • the thickness of the adhesive in area 25 is higher than the thickness of the adhesive in area 26.
  • distributor 22 is shaped as a bar parallel to axis C.
  • Scraper 23 comprises, in turn,:
  • Tool 31 and surface 21 are separated in a radial direction with respect to axis C by a gap 27.
  • adjusting means 24 comprise an actuator 40, which is controllable to exert an adjustable force F3 on scraper 23 also on the basis of at least one first operative parameter of said adhesive and/or said labels and/or adhesive roller, so as to correspondingly adjust the pressure exerted by adhesive scraper 23 onto the adhesive and, therefore, the amount of adhesive to be applied to labels 2.
  • the amount of adhesive that remains on area 26 downstream of scraper 23 is controlled by adjusting the pressure exerted by scraper 23 on the adhesive flowing between scarper 23 and roller 20.
  • rheology of the adhesive is such that the adhesion of the adhesive to roller 20 and the stiffness of the adhesive is enough to create a reaction force F1 (opposite to force F3), which tends to separate scraper 23 from roller 20, when the latter rotates about axis C. This means that substantial pressures are created as the adhesive is dragged inside gap 27.
  • a human machine interface 45 which is connected, via a control unit 46, to actuator 40.
  • human machine interface 45 comprises a programmable logic controller 70.
  • a plurality of temporal profiles of force F3 are memorized in a store unit 71 of controller 70 and associated with different operative conditions of labelling group 5.
  • Actuator 40 is controlled by human machine interface 45, so that force F3 exerted by actuator 40 on scraper 23 is adjusted on the basis of the first parameters set in human machine interface 45.
  • actuator 40 is controlled also by using a sensor 47 ( Figure 2 ), which is connected, via a control unit 46, to actuator 40.
  • labelling group 5 comprises sensor 47 (only schematically shown in Figure 4 ), which is configured to generate a signal, which is associated to at least one second parameter representative of the adhesive in area 26, downstream of scraper 23 proceeding according to the advancing rotation direction of roller 20.
  • labelling group 5 comprises a programmable logic controller 70.
  • sensor 47 is configured to generate a signal associated to the weight per unit of surface of adhesive in area 26.
  • Control unit 46 is also programmed for elaborating the signal generated by sensor 47 and generating a control signal for actuator 40, so as to adjust force F3 exerted by actuator 40 on scraper 23 on the basis of the first parameters and/or second parameters.
  • sensor 46, control unit 47 and actuator 40 form a continuous closed control loop.
  • a software is loaded and executed on control unit 46 and implements and algorithm, which generates, for each set of first parameters and/or second parameters, a control law for actuator 40.
  • actuator 40 comprises (as schematically shown in Figure 2 ):
  • actuator 40 is configured to exert only force F3 of scraper 23 and is freely movable with respect to scraper 23. In this way, the actuator 40 does not cause any movement of scraper 23 in the radial direction to axis C.
  • cylinder 42 comprises:
  • Spherical joints 51, 55 are aligned parallel to direction of force F3, which, coincides, in the embodiment shown, with the radial direction to axis C.
  • support 30 comprises, in turn,:
  • Holder 32 comprises, in turn,:
  • walls 36 are substantially trapezoidal.
  • Edge 37 comprises, in turn, a pair of end segments 38, which are sloped with respect to axis C and define respective oblique sides of corresponding walls 36.
  • Edge 37 further comprises a planar portion 39, which is interposed between segments 38, lies on a plane orthogonal to a radial direction to axis C and parallel to axis C, and defines respective minor basis of walls 36.
  • Actuator 40 is configured to exert force F3 directly on planar portion 39 of scraper 23.
  • cylinder 42 cooperates with planar portion 39, through the interposition of spherical joint 51.
  • Tool 31 is therefore, in use, subjected to:
  • holder 32 and, therefore, tool 31 is hinged to support 30:
  • support 30 comprises:
  • Axis E is, in the embodiment shown, parallel to and staggered from axis C.
  • Rod 48 of support 30 is fixed with respect to axis C, in particular along the radial direction with respect to axis C.
  • support 30 and rod 48 are not motorized in the radial direction with respect to axis C.
  • the tool 31 is substantially fixed in the radial direction with respect to axis C.
  • adhesive roller 20 comprises:
  • bearing 56 Due to the inevitable tolerances in the shape/design of bearing 56, as shaft 58 rotates about axis C, the latter is not perfectly fixed but slightly oscillates with respect to a fixed direction, for example vertical.
  • carousel 4 is fed with articles 3 to be labelled at inlet station 7 and rotates about axis A so as to convey articles 3 to be labelled along path P.
  • Labelling groups 5 apply, at respective application stations 6 of path P, respective series of single cut and covered with adhesive labels 2 onto relative articles 3.
  • strip 10b is unwound off reel 10a and fed along the feed path by unwinding rollers 10c.
  • cutting device 11 cuts label 2 to the desired length.
  • Transfer mechanism 13 rotates about axis B, so as to transfer, one after the other, cut label 2 from cutting device 11 to application station 6 through application unit 12.
  • drum 14 contacts the first side of label 2.
  • Application unit 12 applies a required amount of adhesive substance onto the second side, opposite to drum 14, of label 2.
  • adhesive roller 20 rotates about axis C, and distributor 22 applies adhesive onto area 25 of roller 20.
  • Tool 31 of scraper 23 removes the excess of adhesive from area 25 of roller 20, so that only the required amount of adhesive to be applied on label 2 remains on area 26 of roller 20.
  • actuator 40 exerts an adjustable force F3 on tool 31.
  • Force F3 is directed radially to axis C and towards the roller 20, and generates a pressure on the adhesive flowing between scraper 23 and roller 20.
  • rheology of the adhesive is such that the adhesion of the adhesive to roller 20 and the stiffness of the adhesive is enough to create a reaction force F1 (opposite to force F3), which tends to separate scraper 23 from roller 20, when the latter rotates about axis C.
  • the amount of adhesive that remains on area 26 is adjusted by scraper 23 without any substantial adjustment of the thickness of gap 27, but adjusting the pressure exerted by scraper 23 on the adhesive which passes through gap 27.
  • Non-limitative examples of the first parameters are the type of the adhesive; and/or the material of labels 2; the roughness of surface 21; and/or the level of contamination of surface 21; and/or the shape, in particular the profile of surface 21; and/or the stresses applied to the adhesive; and/or the application temperature of the adhesive.
  • sensor 47 In the third operative scenario ( Figure 4c ), sensor 47 generates the signal, which is associated to at least one second parameter representative of the adhesive in area 26, e.g. a parameter representative of the weight per unit of surface of adhesive in area 26.
  • control unit 46 elaborates also the second parameters and generates the control signal for actuator 40, on the basis of the first parameters and the second parameters. In this way, force F3 exerted by actuator 40 on scraper 23 and accordingly the pressure generated by tool 31 on the adhesive flowing between surface 21 and scraper 23 is adjusted on the basis also of the second parameters.
  • sensor 47, control unit 46 and actuator 40 form a closed continuous loop.
  • axis C slightly oscillates with respect to the fixed direction - for example vertical, due to the inevitable tolerances in the shape/design of bearings 56.
  • tool 31 substantially remains in the same position with respect to the oscillating surface 21 of roller 20.
  • Number 1' in Figure 5 indicates a second embodiment of an application unit 12' in accordance with the present invention; application unit 12, 12' similar to each other, the following description is limited to the differences between them, and using the same references, where possible, for identical or corresponding parts.
  • application unit 12' differs from application unit 12 in that:
  • direction G' is orthogonal to axes D and C.
  • force F3' and force F1' are staggered with respect to one another.
  • application unit 12' differs from that of application unit 12 in that force F3' is staggered from and parallel to force F1' acting on scraper 23 and deriving from the action of flow of adhesive inside gap 27.
  • actuator 40 is controllable on the basis of at least one first operative parameter to exert an adjustable force F3, F3' on scraper 23. That adjustable force F3, F3' adjusts the pressure exerted by scraper 23 on the adhesive flowing between surface 21 and tool 31 of scraper 23, thus correspondingly adjusting the amount of adhesive to be applied to labels 2.
  • actuator 40 adjusts the amount the of adhesive that remains on area 26 and that, therefore, is applied to labels 2 by adjusting force F3, F3' exerted on scraper 23, instead of adjusting the thickness of gap 27 between surface 21 and scraper 23, as in the known solution discussed in the introductory part of the present description.
  • the Applicant has found that it possible to control the amount of adhesive to be applied on labels 2 in a high precise and repeatable way, also in some particularly severe operative conditions, especially in case of high-viscous adhesive and/or in case of high rotational speed of roller 20 about axis C.
  • the Applicant has found that the pressure exerted by scraper 23 on adhesive flowing through gap 27 varies the residual load of the adhesive on roller 20 and, therefore, varies the amount of adhesive that flows in area 26.
  • rheology of the adhesive is such that the adhesion of the adhesive to roller 20 and the stiffness of the adhesive is enough to create reaction force F1, F1' (opposite to force F3, F3'), which tends to separate scraper 23 from roller 20, when the latter rotates about axis C.
  • This effect is particularly enhanced in case of high-viscous adhesive and/or the hydrodynamic actions generated by high rotational speed of roller 20.
  • tool 31 of scraper 30 is not displaced along a radial direction with respect to axis C, but simply undergoes force F3, F3' directed parallel to that radial direction.
  • control unit 46 is programmed for associating to the different first parameters inserted by the user inside human interface 45 respective control laws for actuator 40 and, therefore, respective temporary profiles of force F3 applied on scraper 23.
  • the temporary profile of pressure acting on the adhesive can be adjusted automatically on the basis of the first parameters, in particular, on the basis of the format of labels 2 and/or roller 20 and of the material of adhesive.
  • the amount of adhesive applied on area 26 and, therefore, on labels 2 can be precisely and with high repeatibility controlled, without requiring highly skilled operators.
  • control unit 46 controls force F3, F3' also on the basis of the second parameters detected by sensor 47, thus creating a continuous closed loop and further enhancing the repeatibility and the precision of the application of adhesive onto labels 2.
  • Holder 32 of scraper 23 can rotate about axes D, E with respect to rod 48.
  • tool 31 remains aligned and parallel to axis C, as roller 20 rotates and axis C slightly oscillates about a fixed direction, due to the inevitable tolerances in the shape/design of bearings 56.
  • Scraper 23 is made of plastic material. In this way, scraper 23 can be made of a material, which is soft, and wear resistant with low friction as for example PTFE or in a more stable material as for example Peek.
  • scraper 23 can be made of an inert plastic. In this way, the risk of complex mechanical friction mechanism against the metal of roller 20 is dramatically reduced.
  • the scraper 23 allows to overcome the drawbacks of the known scrapers discussed in the introductory part of the present description.
  • spherical joints 51, 55 could be replaced by respective hinges, which are configured in such way to ensure that actuator 40 exerts force F3, F3' on scraper 23 directed parallel to the radial direction to axis C, without substantially causing any displacement of scraper 23 parallel to axis C.
  • Actuator 40 could not comprise cylinder 42, but could be electro-mechanical, hydraulic or comprising a screw.

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  • Labeling Devices (AREA)
EP14180227.2A 2014-08-07 2014-08-07 Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln Not-in-force EP2982608B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14180227.2A EP2982608B1 (de) 2014-08-07 2014-08-07 Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14180227.2A EP2982608B1 (de) 2014-08-07 2014-08-07 Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln

Publications (2)

Publication Number Publication Date
EP2982608A1 true EP2982608A1 (de) 2016-02-10
EP2982608B1 EP2982608B1 (de) 2017-01-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14180227.2A Not-in-force EP2982608B1 (de) 2014-08-07 2014-08-07 Vorrichtung und Verfahren zum Auftragen von Klebstoff auf Etiketten zum Anbringen auf entsprechenden Artikeln

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623451A (en) * 1968-10-16 1971-11-30 Advance Products Inc Glue roller assembly
EP0463449A1 (de) * 1990-06-18 1992-01-02 KHS ETI-TEC MASCHINENBAU GmbH An einer Leimwalze anstellbarer Leimschaber in einer Etikettiermaschine
DE19860091A1 (de) * 1997-12-25 1999-07-01 Kirin Brewery Übertragungsvorrichtung für eine viskose Flüssigkeit
EP1077178A1 (de) * 1999-08-17 2001-02-21 KHS Maschinen- und Anlagenbau Aktiengesellschaft Einstellbarer Leimschaber
WO2008049592A1 (de) * 2006-10-27 2008-05-02 Khs Ag Beleimungsvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623451A (en) * 1968-10-16 1971-11-30 Advance Products Inc Glue roller assembly
EP0463449A1 (de) * 1990-06-18 1992-01-02 KHS ETI-TEC MASCHINENBAU GmbH An einer Leimwalze anstellbarer Leimschaber in einer Etikettiermaschine
DE19860091A1 (de) * 1997-12-25 1999-07-01 Kirin Brewery Übertragungsvorrichtung für eine viskose Flüssigkeit
EP1077178A1 (de) * 1999-08-17 2001-02-21 KHS Maschinen- und Anlagenbau Aktiengesellschaft Einstellbarer Leimschaber
WO2008049592A1 (de) * 2006-10-27 2008-05-02 Khs Ag Beleimungsvorrichtung

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