EP2433798A1 - System und Verfahren zur Ausrichtung von Magnetspänen eines auf einem blatt- oder bahnförmigen Substrat aufgetragenen Tinten- oder Lackbindemittels - Google Patents

System und Verfahren zur Ausrichtung von Magnetspänen eines auf einem blatt- oder bahnförmigen Substrat aufgetragenen Tinten- oder Lackbindemittels Download PDF

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Publication number
EP2433798A1
EP2433798A1 EP10179681A EP10179681A EP2433798A1 EP 2433798 A1 EP2433798 A1 EP 2433798A1 EP 10179681 A EP10179681 A EP 10179681A EP 10179681 A EP10179681 A EP 10179681A EP 2433798 A1 EP2433798 A1 EP 2433798A1
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EP
European Patent Office
Prior art keywords
magnetic
substrate
ink
field
cylinder body
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
EP10179681A
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English (en)
French (fr)
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EP2433798B1 (de
Inventor
Mathias Gygi
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.)
KBA Notasys SA
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KBA Notasys SA
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Application filed by KBA Notasys SA filed Critical KBA Notasys SA
Priority to EP14193754.0A priority Critical patent/EP2845732B1/de
Priority to ES10179681.1T priority patent/ES2540864T3/es
Priority to ES14193754.0T priority patent/ES2623162T3/es
Priority to EP10179681.1A priority patent/EP2433798B1/de
Publication of EP2433798A1 publication Critical patent/EP2433798A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/20—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields
    • B05D3/203—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by magnetic fields pre-treatment by magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/12—Machines with auxiliary equipment, e.g. for drying printed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/002—Apparatus or machines for carrying out printing operations combined with other operations with means for applying specific material other than ink
    • B41F19/005—Apparatus or machines for carrying out printing operations combined with other operations with means for applying specific material other than ink with means for applying metallic, conductive or chargeable material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/08—Combinations of endless conveyors and grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/045—Drying sheets, e.g. between two printing stations by radiation
    • B41F23/0453—Drying sheets, e.g. between two printing stations by radiation by ultraviolet dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams

Definitions

  • the present invention generally relates to a system and method for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate.
  • the present invention is especially applicable and usable in the context of the production of security documents, such as banknotes.
  • the present invention also relates to a printing press comprising such a system.
  • a printing press comprising a cylinder body for orienting magnetic flakes is known as such in the art.
  • Such a printing press is for instance disclosed in International application No. WO 2005/000585 A1 filed in the name of the present Applicant.
  • FIG. 1 One embodiment of a sheet-fed printing press disclosed in International application No. WO 2005/000585 A1 is represented in Figure 1 .
  • This printing press is adapted to print sheets according to the silk-screen printing process and comprises a feeding station 1 for feeding successive sheets to a silk-screen printing group 2 where silk-screen patterns are applied onto the sheets.
  • the printing group 2 comprises an impression cylinder 2a cooperating with two screen cylinders 2b, 2c placed in succession along the printing path of the sheets.
  • the freshly printed sheets are transported by means of a conveyor system 3 to a delivery station 4 comprising a plurality of delivery pile units, three in this example.
  • the conveyor system 3 is typically an endless chain conveyor system comprising a plurality of spaced-apart gripper bars (not shown in Figure 1 ) extending transversely to the sheet transporting direction, each gripper bar comprising grippers for holding a leading edge of the sheets.
  • a processing unit 10* comprising a cylinder 10 carrying a plurality of magnetic-field-inducing devices is located along the path of the sheets carried by the chain conveyor system 3.
  • This cylinder 10 is designed to apply a magnetic field to selected locations of the sheets for the purpose of orienting magnetic flakes contained in the patterns of ink or varnish which have been freshly-applied on the sheets in the printing group 2.
  • a drying or curing unit 5 is provided downstream of the cylinder 10 for drying, respectively curing, the ink/varnish applied onto the sheets after the magnetic flakes have been oriented, such unit 5 being typically an infrared drying unit or a UV curing unit depending on the type of ink or varnish used.
  • Silk-screen printing is in particular adopted, in the context of the production of security documents, such as banknotes, to print optically-variable patterns onto the documents, including so-called iridescent patterns and OVI® patterns (OVI® is a registered trademark of SICPA Holding SA, Switzerland).
  • OVI® is a registered trademark of SICPA Holding SA, Switzerland.
  • Such patterns are printed using inks or varnishes containing special pigments or flakes producing optically variable effects.
  • Magnetic flakes are also known in the art, which flakes have the particularity that they can be oriented or aligned by an appropriately-applied magnetic field. While the terminology “magnetic flakes” is used, it should be understood that this terminology designates flakes that can be oriented using a magnetic field, including flakes that are not necessarily magnetic per se but are capable of being oriented using a magnetic field. Such magnetic flakes and method for orienting such magnetic flakes are discussed in particular in US Patent No. US 4,838,648 , European patent application No. EP 0 686 675 A1 , and International applications Nos.
  • the most convenient method to apply the above magnetic flakes is by silk-screen printing as discussed in the above-mentioned International application WO 2005/000585 A1 .
  • This is mainly due to the fact that the flakes have a relatively important size which restricts the choice of available printing processes for applying inks or varnishes containing such flakes.
  • silk-screen printing constitutes the most convenient printing process to achieve this goal.
  • silk-screen printing has the advantage that relatively thick layers of ink or varnish can be applied.
  • the inks or varnishes used in silk-screen printing exhibit a relatively low viscosity which favours proper orientation of the magnetic flakes.
  • Orientation of the magnetic flakes is carried out by applying an adequate magnetic field to the freshly-applied ink or varnish containing the magnetic flakes.
  • the magnetic flakes can be aligned in any desired pattern producing a corresponding optically-variable effect which is very difficult, if not impossible to counterfeit.
  • an adequate solution for orienting the magnetic flakes consists in bringing the sheets in contact with a rotating cylinder carrying a plurality of magnetic-field-inducing devices.
  • the cylinder 10 could alternatively be located at the sheet transfer location 3a between the impression cylinder 2a and the conveyor system 3. Still according to another embodiment envisaged in International application No. WO 2005/000585 A1 , the impression cylinder 2a itself could be designed as a cylinder carrying magnetic-field-inducing devices.
  • the cylinder 10 used to orient the magnetic flakes advantageously cooperates with the non-freshly-printed side of the sheets, thereby preventing smearing problems, the magnetic field being applied from the back side of the sheets through the freshly-printed patterns of ink or varnish.
  • the cylinder 10 is rotated at a circumferential speed corresponding to the speed of the transported sheets so that there is no relative displacement between the transported sheets and the circumference of the cylinder.
  • the cylinder 10 is placed in the path of the chain conveyor system 3 such that the sheets follow a curved path tangential to the outer circumference of the cylinder 10, thereby enabling part of the surface of the processed sheet to be brought in contact with the outer circumference of the cylinder 10.
  • each printed sheet (or each successive portion of a continuous web, in case of web-printing) carries an array of imprints arranged in a matrix of rows and columns, which imprints ultimately form individual securities after final cutting of the sheets or web portions.
  • the cylinder used to orient the magnetic flakes is therefore typically provided with as many magnetic-field-inducing devices as there are imprints on the sheets or web portions.
  • drying or curing of the ink or varnish vehicle is performed downstream of the cylinder 10 by means of a suitable drying or curing unit 5, i.e. after the substrate has been taken away from the processing unit 10* where orientation of the magnetic flakes is being carried out.
  • One solution to this problem may consist in using electro-magnets to act as the magnetic-field-inducing devices and sequentially interrupting the applied magnetic field, row after row, before the substrate is separated from the processing unit, but this is costly solution (compared to the use of permanent magnets) and may not ultimately solve all issues as the shutting down of the electro-magnets may also affect the orientation of the flakes contained in the ink or varnish vehicle applied on the substrate.
  • a general aim of the invention is therefore to improve the known systems and processes.
  • an aim of the present invention is to provide a solution that ensures that separation of the substrate from the processing unit where orientation of the magnetic flakes contained in the ink or varnish vehicle is carried out has as little effect as possible on the resulting optical effect to be induced in the layer of ink or varnish applied on the substrate.
  • Still another aim of the present invention is to provide a solution that can suitably be integrated in a practical system, especially in a printing press.
  • a system as defined in claim 1 namely a system for orienting magnetic flakes contained in an ink or varnish vehicle applied on a sheet-like or web-like substrate, which system comprises a processing unit with at least one magnetic-field-inducing device for orienting the magnetic flakes contained in the ink or varnish vehicle applied on the substrate, which processing unit is located along a path of the substrate in such a way that the substrate is brought into contact with or in close proximity to the processing unit and the said at least one magnetic-field-inducing device.
  • the system further comprises at least one drying or curing unit disposed in the vicinity of the processing unit for drying or curing the ink or varnish vehicle to fix the orientation of the magnetic flakes contained therein while the substrate is still in contact with or in close proximity to the processing unit and the said at least one magnetic-field-inducing device before the substrate is taken away from the said at least one magnetic-field-inducing device.
  • the processing unit comprises a cylinder body and the said at least one magnetic-field-inducing device is disposed on an outer circumference of the cylinder body.
  • the substrate is advantageously brought into contact with or in close proximity to the outer circumference of the cylinder body over a selected angular sector and the said at least one drying or curing unit is located proximate to the outer circumference of the cylinder body at a downstream end of the selected angular sector.
  • the processing unit may comprise a plurality of magnetic-field-inducing devices distributed in a matrix-like arrangement for orienting the magnetic flakes contained in a plurality of ink or varnish patterns applied on the substrate in a corresponding matrix-like arrangement.
  • the plurality of magnetic-field-inducing devices would be distributed on the outer circumference of the cylinder body.
  • the said at least one drying or curing unit is a UV-curing unit, i.e. a unit capable of applying UV radiation to the substrate, to induce polymerisation of the ink or varnish vehicle.
  • LED elements preferably LED elements producing radiation in the UV range.
  • LED elements may conveniently be arranged in the form of a longitudinal bar extending transversely to the path of the substrate.
  • the invention will be described hereinafter in the context of a sheet-fed silk-screen printing press for printing security papers, in particular banknotes.
  • the silk-screen printing press may be a printing press as illustrated in Figure 1 or any other type of silk-screen printing press, as for instance illustrated in the preferred embodiment of Figure 5 .
  • the illustrated embodiments show a processing unit (hereinafter designated by reference numeral 10*) of the type having a cylinder body which is in particular adapted for cooperation with a chain conveyor system of the type comprising a plurality of spaced-apart grippers bars as already discussed hereinabove.
  • the invention is equally applicable to any other cylinder configuration that could be installed between the printing group of a silk-screen printing press and the delivery station 4.
  • the cylinder body could be part of a processing unit comprising a plurality of processing cylinders each with its own sheet grippers.
  • the illustrated embodiment shows a cylinder body adapted for cooperating with a chain conveyor system, this shall not as such be regarded as an aspect limiting the scope of the invention.
  • the printing press could be provided with (see Figure 5 ) a first chain conveyor system 31 located upstream of the processing unit 10* for transporting the sheets to the processing unit 10* and transferring the sheets to the cylinder body 10 (in which case the cylinder body would comprises its own grippers for taking hold of a leading edge of the sheets) and a second chain conveyor system 32 located downstream of the processing unit 10* for taking the sheets away from the processing unit 10* to the delivery station 4.
  • a first chain conveyor system 31 located upstream of the processing unit 10* for transporting the sheets to the processing unit 10* and transferring the sheets to the cylinder body 10 (in which case the cylinder body would comprises its own grippers for taking hold of a leading edge of the sheets)
  • a second chain conveyor system 32 located downstream of the processing unit 10* for taking the sheets away from the processing unit 10* to the delivery station 4.
  • Figure 5 shows a side view of a sheet-fed silk-screen printing press incorporating a system according to the invention, including a processing unit 10* preferably comprising a cylinder body 10.
  • a processing unit 10* preferably comprising a cylinder body 10.
  • the same reference numerals as in Figure 1 are used in Figure 5 to designate the same elements which do not require any further explanation. It suffices to understand that the main difference between the embodiments of Figure 5 and of Figure 1 resides in the fact that two chain conveyor systems 31, 32 cooperating with the processing unit 10* are provided in the embodiment of Figure 5 , rather than only one. More precisely, a first chain conveyor system 31 is located upstream of the processing unit 10*, while a second chain conveyor system 32 is located downstream of the processing unit 10*.
  • FIGS 2 to 4 illustrate a possible, and preferred, embodiment of the processing unit 10* comprising a cylinder body 10 of the same type as disclosed in International application No. WO 2008/102303 A2 which is incorporated herein by reference in its entirety.
  • Figure 2 is a perspective view of a portion of the cylinder body 10.
  • a common shaft member has been omitted in this Figure, which common shaft member is described in greater detail in International application No. WO 2008/102303 A2 .
  • the cylinder body 10 exhibits an essentially cylindrical outer shape with a clearance 10a extending axially over a length of the cylinder body 10.
  • Such clearance 10a may accommodate grippers (not shown) for holding a leading edge of the sheets.
  • a cover plate 101 is provided on an outer circumference of the cylinder body 10.
  • This cover plate 101 which is made of material exhibiting a low magnetic permeability is advantageously clamped at both extremities in the region of the clearance 10a.
  • Clamping means 102, 103 are provided for this purpose, which clamping means are designed to secure the cover plate 101 in an adequate manner on the outer circumference of the cylinder body 10.
  • the cover plate 101 is clamped at one end by first clamping bars 102 and at the other end by second clamping bars 103. While this is not shown in detail, the second clamping bars 103 are designed to be displaceable on the cylinder body 10 so as to adjust the tension of the cover plate 101.
  • the cover plate 101 is provided in this example with a plurality of rectangular openings 101 a.
  • the positions of these openings 101 a is made to correspond to the positions of below-located magnetic-field-inducing devices.
  • the openings 101 a are as such optional and are preferable in case use is made of a particular type of magnetic-field-inducing devices, such as those described in WO 2005/002866 A1 which are to be disposed preferably in close proximity with the ink/varnish pattern containing the magnetic flakes to be oriented. With other types of magnetic-field-inducing devices, one might omit the openings 101 a.
  • a plurality of small openings 101 b visible on the upper part of Figure 2 are further provided in this example along a plurality of annular lines shown as dashed lines in the lower part of Figure 2 . As described in International application No. WO 2008/102303 A2 , these openings 101 b communicate with a plurality of suction outlets located below the cover plate 101 and designed to permit aspiration of the processed sheet against the circumference of the cylinder body 10.
  • FIG 3 is a view of part of the cylinder body 10 illustrated in Figure 2 without the cover plate 101.
  • the cylinder body 10 comprises a plurality of annular supporting rings 40 distributed axially along the axis of rotation of the cylinder body 10.
  • five identical annular supporting rings 40 are provided.
  • An additional ring 45 is provided at the outermost right extremity of the cylinder body 10. This additional ring 45 essentially fulfils the function of supporting the right-hand side of the cover plate 101 shown in Figure 2 and provides symmetry to the overall cylinder body 10.
  • Each annular supporting ring 40 is preferably provided with a peripheral mounting groove 40a and a pair of peripheral supporting shoulders 40b extending on each side of the annular mounting groove 40a.
  • a plurality of supporting members 50 are mounted on the peripheral mounting groove 40a, which supporting members 50 are designed to receive a corresponding magnetic-field-inducing element (not shown).
  • Such magnet-field-inducing element can be as simple as a permanent magnet as illustrated in Figure 4 of International application WO 2005/000585 A1 or a device comprising a body of permanent magnetic material the surface of which is engraved to cause perturbations of its magnetic field as discussed in International application WO 2005/002866 A1 .
  • the magnet-field-generating devices can be any type of device susceptible of producing a magnetic field capable of orienting the magnetic flakes contained in the ink/varnish patterns applied on the substrate to be processed, such as electro-magnets.
  • Figure 4 is a schematic illustration of the said supporting members 50 according to a possible mounting configuration about the axis of rotation O of the cylinder body 10.
  • all the other elements of the cylinder body 10 have been omitted so as to show all the supporting members 50 in their mounting positions.
  • eight supporting members 50 are provided on each annular supporting ring 40, thus totalling forty supporting members 50, each designed to form a corresponding magnetic-field-inducing device for cooperation with a corresponding one of forty different locations on the sheets being processed.
  • the resulting cylinder body is adapted for cooperation with sheets on the surface of which an array of forty magnetic-flakes-containing patterns arranged in a matrix of five columns and eight rows has been printed. Such arrangement is obviously purely illustrative and other arrangements might be envisaged.
  • peripheral supporting shoulders 40b have a diameter such that the supporting members 50 (and accordingly the magnetic-field-inducing devices as well) are almost completely enclosed between the supporting shoulders 40b.
  • the supporting shoulders 40b are designed to provide a support on each side of the magnetic-field-inducing devices, along the axis of rotation of the cylinder body 10.
  • the peripheral mounting groove 40a preferably exhibits an inverted-T shape for insertion of the supporting members 50.
  • Each supporting member 50 exhibits a corresponding T-shape matching that of the peripheral mounting groove 40a.
  • Each supporting member 50 is preferably provided with its own clamping element 51 (visible in Figure 4 ) adapted for cooperation with the peripheral mounting groove 40a of the annular supporting rings 40 for securing the magnetic-field-inducing devices in place at any desired position along the peripheral mounting groove 40a. In this way, each magnetic-field-inducing device can be adjusted freely along the circumference of the annular supporting rings 40, independently of the other magnetic-field-inducing devices disposed on the same annular supporting ring 40.
  • each ring 40 (and 45) comprises an inner mounting groove 400a extending parallel to the axis of rotation O of the cylinder body 10.
  • This inner mounting groove 400a is designed to enable mounting on the rings 40, 45 at a determined angular position about the common shaft member.
  • a mounting bar (not shown) is secured to a longitudinal portion of the common shaft member, which mounting bar cooperates with the inner mounting grooves 400a of the annular supporting rings 40. In this way, each annular supporting ring 40 is precisely positioned with respect to the common shaft member and according to a same common angular reference position.
  • each annular supporting ring 40 is freely adjustable along the axis of the common shaft member, independently of the other annular supporting rings 40.
  • FIG 6 is a schematic side view illustrating the cooperation of the cylinder body 10 with the path P of the sheets in Figure 5 .
  • sheets are being transferred, with the freshly-printed side (where the ink or varnish vehicle containing the magnetic flakes is applied) oriented upwards, to the cylinder body 10 by the upstream-located chain conveyor system 31 (not shown in Figure 6 but located on the right-hand side of the cylinder body 10 in Figure 6 ) and then taken away from the cylinder body 10 by the downstream-located chain conveyor system 32 (not shown in Figure 6 but located on the left-hand side of the cylinder body 10 in Figure 6 ).
  • the sheets therefore follow a curved path P (from right to left in Figures 5 and 6 ) about the outer circumference of the cylinder body 10, which cylinder body 10 is made to rotate around its axis of rotation O (in a counterclockwise direction as illustrated by the arrow in Figure 6 ) in synchronism with the displacement of the sheets and the movement of the gripper bars of the chain conveyor systems 31, 32. More precisely, the cylinder body 10 is provided with grippers (not shown) to hold a leading edge of the sheets.
  • the cylinder body 10 When a new sheet is arriving, the cylinder body 10 is positioned in such a way that the grippers thereof are brought in the vicinity of the gripper bar of the upstream-located chain gripper system 31 to allow transfer of the corresponding sheet onto the circumference of the cylinder body 10 in a manner known as such in the art. Transfer of the sheet from the cylinder body 10 to the downstream-located chain conveyor system 32 is made in a similar way.
  • Line A in Figure 6 schematically designates the location where the sheet is transferred to the cylinder body 10 from the upstream-located chain conveyor system 31.
  • line B in Figure 6 schematically designates the location where the sheet is taken away form the cylinder body 10 and transferred to the downstream-located chain conveyor system 32.
  • Lines A and B delimit an angular sector S along the circumference of the cylinder body 10 where each sheet is being brought into contact with (or at least in close proximity to) the outer circumference of the cylinder body 10.
  • This angular sector S defines the region where orientation of the magnetic flakes is carried out. While the angular sector S shown in Figure 6 is smaller than 180°, this shall only be considered to be illustrative.
  • the angular sector S way alternately chosen to be as wide as possible, especially greater than 180°.
  • At least one drying or curing unit 60 is provided in the vicinity of the processing unit 10* for drying or curing the ink or varnish vehicle to fix the orientation of the magnetic flakes contained therein while the substrate is still in contact with or in close proximity to the processing unit 10* (and the magnetic-field-inducing devices) before the substrate is taken away from the magnetic-field-inducing devices.
  • the drying or curing unit 60 is located proximate to the outer circumference of the cylinder body 10 at a downstream end of the angular sector S.
  • the drying or curing of the ink or varnish vehicle does not necessarily need to be complete, i.e. it may suffice to partly dry or induce partial curing of the ink or varnish vehicle to prevent the flakes from moving too much during separation of the substrate from the processing unit. In that respect, it may still be necessary to provide an additional drying or curing unit 5 along the path of the sheet downstream of the processing unit 10* as shown in Figure 5 .
  • the drying or curing unit 60 may be of a type suitable to dry or cure almost completely the ink or varnish vehicle, without there being a need anymore for an additional drying or curing unit 5.
  • the drying or curing unit 60 may be of any suitable type. It is however preferred and advantageous to use a UV-curing unit, i.e. a unit suitable for applying UV radiation to the substrate (provided the ink or varnish vehicle is a UV-curable ink or varnish vehicle).
  • a UV-curing unit i.e. a unit suitable for applying UV radiation to the substrate (provided the ink or varnish vehicle is a UV-curable ink or varnish vehicle).
  • the drying or curing unit 60 may include LED elements, preferably LED elements producing radiation in the UV range (or "UV-LED curing elements").
  • LED elements may conveniently be arranged in the form of a longitudinal bar extending transversely to the path of the substrate.
EP10179681.1A 2010-09-24 2010-09-24 System und Verfahren zur Ausrichtung von Magnetspänen eines auf einem blatt- oder bahnförmigen Substrat aufgetragenen Tinten- oder Lackbindemittels Active EP2433798B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14193754.0A EP2845732B1 (de) 2010-09-24 2010-09-24 Bogendruckmaschine und Verfahren zur Ausrichtung von Magnetspänen in einer Tinte oder einem Lackmedium zum Auftragen auf ein bogenähnliches Substrat
ES10179681.1T ES2540864T3 (es) 2010-09-24 2010-09-24 Sistema y método para orientar escamas o laminillas magnéticas contenidas en un vehículo de tinta o barniz aplicado sobre un sustrato en forma de lámina o en forma de banda
ES14193754.0T ES2623162T3 (es) 2010-09-24 2010-09-24 Prensa de impresión alimentada con láminas y método para orientar escamas magnéticas contenidas en un vehículo de tinta o barniz aplicado sobre un sustrato en forma de lámina
EP10179681.1A EP2433798B1 (de) 2010-09-24 2010-09-24 System und Verfahren zur Ausrichtung von Magnetspänen eines auf einem blatt- oder bahnförmigen Substrat aufgetragenen Tinten- oder Lackbindemittels

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EP14193754.0A Division EP2845732B1 (de) 2010-09-24 2010-09-24 Bogendruckmaschine und Verfahren zur Ausrichtung von Magnetspänen in einer Tinte oder einem Lackmedium zum Auftragen auf ein bogenähnliches Substrat

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EP14193754.0A Active EP2845732B1 (de) 2010-09-24 2010-09-24 Bogendruckmaschine und Verfahren zur Ausrichtung von Magnetspänen in einer Tinte oder einem Lackmedium zum Auftragen auf ein bogenähnliches Substrat

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DE102013015277A1 (de) 2013-09-16 2015-03-19 Schwarz Druck GmbH Orientierung magnetisch orientierbarer Partikel in einer Farbe mit mehreren einander überlagerten Magnetfeldern
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US11065866B2 (en) 2014-08-22 2021-07-20 Sicpa Holding Sa Apparatuses for producing optical effect layers
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EP3015266A1 (de) 2014-10-30 2016-05-04 KBA-NotaSys SA Druckmaschine mit einer Einheit zum magnetischen Ausrichten und einer bewegbaren Trockner- bzw. Aushärtungseinheit
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ES2540864T3 (es) 2015-07-14
EP2845732B1 (de) 2017-03-22
EP2845732A2 (de) 2015-03-11

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