EP3658379B1 - Device and method for coating printed blanks and printing machine - Google Patents

Description

The invention relates to a device for coating panels, a printing press and a method for coating panels according to the preamble of claims 1, 8 and 12, respectively.

For different applications in the printing industry, it is customary and advantageous if the panels are coated with a coating, e.g. B. as a layer of paint or other sealing obtained. In some applications it is desirable if the panels do not have a coating over the entire surface, but only on part of the surface, e.g. B. a so-called. Spot varnishing obtained. On the one hand, this can serve to upgrade the product by achieving special optical effects, or to meet specific requirements in the subsequent processing of the benefits.

It is also suitable for industrial applications in the printing industry - especially when using non-impact printing processes, such as e.g. B. in inkjet processes - customary and advantageous to pretreat the substrate prior to printing by application or coating with a so-called primer or "bonding agent", in particular different from ink or printing ink.

In the EP 1 207 044 B1 discloses a method for producing spot varnishes on printing materials, with varnish being applied to the printing material over the entire surface in a varnishing unit, which varnish interacts differently with previously applied colors of different color systems and therefore produces different degrees of gloss.

Through the EP 1 389 523 A1 a printing machine is known, a varnishing or flexographic printing unit being arranged downstream of an offset printing unit.

The DE 10 2013 219 259 A1 relates to printing presses that work without printing forme, in particular inkjet printing presses, in which a web can be printed several times in succession by several double rows of print heads. Each double row of print heads is preferably assigned and / or assignable a printing color of a specific color, for example one of the colors black, cyan, yellow and magenta or a lacquer, for example a clear lacquer. Upstream of the printing, a printing material preparation can be provided in the printing material path, which in one embodiment can be, for example, a coating device for applying primer.

The WO 2010/127913 A1 relates to a web-fed rotary offset printing machine with a coating unit comprising an anilox roller with a chamber doctor blade.

The DE 10 2012 209 130 A1 relates to an inking unit for a digital offset printing machine. In this case, stenciling is to be avoided in that the ink that has not been removed is removed from the roller jacket surface by an inking application roller after the ink has been applied to an image generation cylinder by a correspondingly designed device. In an example of inking a digital offset printing plate with an inking component, dampening solution is first applied to the imaging cylinder, the dampening solution layer is patterned by means of digital evaporation and the printing ink is delivered by the inking component to the dampening solution-free areas on the imaging cylinder. The residual color remaining on the coloring component due to non-removal is removed before renewed coloring.

The DE 100 52 011 A1 , DE 196 17 746 A1 and DE 10 2004 048 150 A1 concern all setting of color profiles in inking units. The printing ink, possibly roughly pre-profiled, is applied by such inking units to the forme cylinder, the printing form of which defines the printing pattern to be transferred to the printing material.

The documents DE 10 2016 214 899 A1 , WO 2004/013704 A1 and DE 10 2005 021 185 A1 disclose printing machines each having at least one digital printing device.

The DE 10 2005 021 185 A1 discloses a printing machine with a sheet feeder, a printing unit and a delivery, a device for precoating the printing material using an ink-jet printing process without printing form being provided in the printing material path in front of the printing unit.

Through the WO 2016/116168 A1 a roller arrangement for coating printing material is known, in which a roller having cells is applied with the coating agent, and at points where no coating agent is to be applied to the printing material downstream, the coating agent is at least partially removed from the cells by a blowing device.

The invention is based on the object of creating a device for coating panels, a printing press and a method for coating panels.

The object is achieved according to the invention by the features of claims 1, 8 and 12, respectively.

The advantages that can be achieved with the invention are, in particular, that changing coating patterns can also be implemented for small series without a large expenditure of time or material.

For example, small or very small series, e.g. B. down to single copies, effectively coated only in the area of partial areas, in particular painted. This is of particular advantage in packaging printing, e.g. B. for small series, in productions with at least the position of glue points or glue surfaces differing benefits.

In the case of a printing material still to be printed with one or more panels, this can, for example, be coated in a targeted manner only in the area of partial areas which are then also to be printed.

A corresponding device for coating a substrate that is printed or to be printed with one or more panels with a coating agent, in particular a varnish or a primer, in particular different from printing ink or ink, comprises an applicator roller which is coated with the substrate to be coated in the area of a contact zone can be brought into rolling contact in order to coat it on the side facing the applicator roller, and a supply device that supplies the applicator roller with coating agent, which in the area of at least one contact zone on the circumference of the applicator roller cooperates with this around the circumferential surface of the applicator roller over a width, here z. B. called application width to apply continuously with coating agent to be applied to the substrate. In order to carry out a partial coating, the applicator roller is assigned a removal device with removal elements, by means of which the coating agent previously applied continuously to the lateral surface by the feed device over the application width before the downstream delivery to the printing material selectively, ie in one or in several sections a, which are part-width relative to the application width, z. B. Axial sections a, clocked to the machine and / or printing material phase position for defined and / or definable phase lengths can be removed again from the lateral surface. On the circumferential sections lying in between, the coating agent remains on the jacket surface and is - at least in part - following the printing material submitted. In particular, the coating agent can be removed again from the conveying surface in defined subregions that are shorter than the circumferential length of the application roller and narrower than the width of application.

In this case, a plurality of partial areas in their axial position and extent and in their phase position and length can preferably be defined independently of one another in relation to the development length of the applicator roller and / or to a length of the panel. Preferably, in successive rotations of the applicator roller, the coating agent can be removed in terms of its axial position or extent and / or subregions which differ in terms of their phase position or length.

The removal device is in particular arranged to interact with the application roller in the circumferential area - viewed in the operating direction of rotation - between the single or last contact zone with the supply device and the contact zone with the printing material.

The removal device is designed in particular as a device that removes the coating agent by mechanical means. In addition to removal elements that can preferably be put on and off, in particular doctor blades, blow nozzles are also conceivable as removal elements, which remove the coating agent from the outer surface by means of targeted blasts of air. When removing by mechanical means, coating agent is advantageously removed as such, so z. B. not just individual components from this, as can occur, for example, for mixtures of substances with partial evaporation or drying.

A coating of a printing material printed with one or more panels or to be printed with a coating agent, in particular a lacquer or a primer, is carried out according to the invention on the basis of digital data using a - preferably indirect - coating process without a fixed coating form one or more in number and / or size and / or shape and / or position variable areas without coating. In the case of adhesive points to be left out from painting, these areas without a coating are also referred to below as cutouts. In the case of areas not to be provided with primer, these can be cutouts or also contiguous areas with coated partial areas enclosed by them.

In a printing machine with a printing unit that works according to a non-impact process, the option of selective coating - be it before printing with a primer or after printing with a varnish - with a variable pattern is particularly advantageous.

Such a printing machine comprises a printing material feed through which the printing material to be printed can be fed on the input side, a printing unit that works and / or can be operated according to a non-impact process, and a product receptacle through which the printed printing material can be further processed and / or combined in a container. In this case, a coating device is provided downstream of the printing unit in the printing material path and / or a coating device upstream of the printing unit, by means of which the printing material printed with a panel upstream or still to be printed downstream is based on digital data according to a - in particular indirect - coating process without a fixed coating form, with in Number and / or size and / or shape and / or position of variable areas can be coated without a coating.

Advantageous designs and developments of the coating device according to the invention, the printing press according to the invention and the method according to the invention for coating can be found individually or in groups of the following explanations.

An embodiment of the invention is shown in the drawings and is shown in FIG preferred embodiments and variants described in more detail below.

Fig. 1

Fig. 1 eine schematische Darstellung eines Bedruckstoffausschnittes mit einem darauf befindlichen Nutzen;

Fig. 2

eine An-Abstell-Sequenz eines in einer Flucht aus Fig. 1 befindlichen x-ten Abnahmeelementes für den Zustand der Anstelllage und Abstelllage in Abhängigkeit von der Nutzenphasenlage;

Fig. 3

ein vergrößerter Teilausschnitt aus a) einem einen Nutzen tragenden Bedruckstoff mit einem Klebebereich und einer Aussparung in der Beschichtung mit z. B. einem Lack und b) einem auf einem Nutzen zu druckenden Druckbereich und einer außerhalb des Druckbereichs liegenden Aussparung in der Beschichtung mit z. B. einem Primer;

Fig. 4

eine Schrägdarstellung einer mit dem Bedruckstoff in Berührkontakt befindlichen Auftragwalze;

Fig. 5

eine Seitenansicht eines Ausführungsbeispiels für die Ausführung der Beschichtungsvorrichtung;

Fig. 6

eine perspektivische Ansicht einer Auftragwalze in transparenter Darstellung mit einer ihr zugeordneten Abnahmevorrichtung;

Fig. 7

eine horizontale Schnittdarstellung eines linken Abschnittes aus Fig. 6;

Fig. 8

eine horizontale Schnittdarstellung des Abschnittes gemäß Fig. 7 aus Fig. 6;

Fig. 9

eine vergrößerte Schnittansicht einer Rakelanordnung aus Fig. 8;

Fig. 10

eine Druckmaschine mit einem nach einem Non-Impact-Druckverfahren arbeitenden Druckwerk und einer nach einem ohne feste Beschichtungsform arbeitenden Beschichtungsverfahren.

Show it:

Fig. 1

Fig. 1 a schematic representation of a printing material section with a benefit located thereon;

Fig. 2

a turn-on sequence one in an escape from Fig. 1 the x-th acceptance element located for the state of the parking position and the parking position as a function of the use phase position;

Fig. 3

an enlarged partial section from a) a printing material carrying a benefit with an adhesive area and a recess in the coating with z. B. a varnish and b) a print area to be printed on a panel and a recess lying outside the print area in the coating with z. B. a primer;

Fig. 4

an oblique view of an applicator roller in contact with the printing material;

Fig. 5

a side view of an embodiment for the execution of the coating device;

Fig. 6

a perspective view of an applicator roller in a transparent representation with a removal device assigned to it;

Fig. 7

a horizontal sectional view of a left section Fig. 6 ;

Fig. 8

a horizontal sectional view of the section according to Fig. 7 out Fig. 6 ;

Fig. 9

an enlarged sectional view of a doctor blade assembly Fig. 8 ;

Fig. 10

a printing machine with a printing unit that works according to a non-impact printing process and one that works according to a coating process that works without a fixed coating form.

Fig. 1 shows an example of a benefit 01 that has already been printed one or more times on a printing material 02 that has already been printed one or more times, that is to say a copy 01 of a printed product located on a printing material 02, as is shown, for example, in FIG. B. in the printing industry as an end product or in particular an intermediate product before, for example, further processing or final processing. In this case, one or more such benefits 01 can be provided on a printing substrate 02 in the form of a sheet or - as is the case here in the example - several copies 01 one behind the other and optionally also next to one another on a web-like printing substrate 02, e.g. B. a printing substrate web 02 may be provided. The panels 01 of a series can basically all be the same or at least partially differ in form and / or print image.

Particularly in connection with non-printing form or non-impact printing processes, it may be necessary to apply coating agents outside of the printing itself. This can be, for example, a primer application before the printing or a varnishing that takes place after the printing.

In some applications, especially in the production of packaging, it is of particular advantage if the panels 01 are not coated over the entire surface, but only on part of the panel surface, e.g. B. a so-called. Spot varnishing obtained. In the production of packaging, it is of particular importance when coating, in particular painting of panel 01, later adhesive areas 03, ie areas which are intended for gluing and which are also referred to as "adhesive points", exclude at least part of the intended adhesive surface from coating or painting (see e.g. the schematically illustrated area 04 excluded from coating (also referred to as recess 04 here) in a section of an otherwise provided with coating agent 06, in particular paint 06 Utility 01 in Fig. 3a ).

Adhesive areas 03 should be understood to mean those areas on the panel 01 which are covered by overlapping on the later product and are intended for gluing to another part of the same panel 01 or another partial product. The adhesive area 03 in the present sense can, but does not have to come into contact with adhesive over its entire surface or participate in the gluing process. The recess 04 assigned to the adhesive area 03 can in principle correspond in size and shape to the area provided for the adhesive area 03 or else be smaller than this, as long as it ensures that the adhesive adheres to the relevant "adhesive point" on a sufficiently large area. In this case, the actual gluing at a “glue point” can in principle also be formed on several smaller recessed areas.

On the other hand, before printing, it can be advantageous to only select the areas 05 intended for printing, e.g. B. pressure areas 05, with a so-called. Primer 06 '(a fluid for pretreating the printing substrate 02) as a coating agent 06' to apply. The areas to be coated can correspond exactly to the areas 05 to be printed or, to be on the safe side, they can also be somewhat larger. The areas 04 'not to be provided with primer can be recesses 04' or also contiguous areas 04 'with coated partial areas enclosed by them (see e.g. Figure 3b ).

To also small or very small series, z. B. down to individual copies, of themselves in at least the position of adhesive areas 03 and / or printing areas 05 To be able to effectively coat distinguishing benefits 01, in particular varnish and / or specifically prepare them with primer 06 ', is - in particular in an embodiment of a printing press set out below - a device for coating 07; 43, briefly coating device 07; 43 provided, through which the substrate 02 carrying the panel 01 is based on digital data according to a - in particular indirect - coating process, ie without a fixed coating or lacquer form, with areas that can be varied in number and / or size and / or shape and / or position 04; 04 'without coating or coating agent 06; 06 ', in particular cutouts 04; 04 'can be coated.

This is intended both for the execution of the coating device 07 as z. B. painting device 07 for coating already printed substrate 02, as well as for an alternative embodiment of the coating device 43 as z. B. Application device 43 for primer 06 'for coating a printing substrate 02 that is still to be printed. In a printing press that is detailed below, only one of the two devices 07; 43 or both of the devices 07; 43 can be provided in the printing material path.

In contrast to the omission of the coating with lacquer 06 in adhesive areas 03, when the coating with primer 06 'is omitted from areas 05 that are not to be printed, these coating agent-free areas 04' are possibly larger in area than the area to be coated. It can also happen that in certain axial sections a over the length L01, z. B. panel length L01 the coating agent 06 'is removed again.

Because the structure is basically the same, the components and the point of interaction with the printing substrate 02 for the two versions of the device 07; 43 uses the same reference numerals per se. The following remarks are therefore applicable to both applications, namely to the application as a painting device 07 and as an application device 43 for primer 06 '.

It is through device 07; 43 a benefit 01 z. B. both related to the length of the panel 01 in the transport direction T and transversely to this, each with a plurality of variably positionable areas 04; 04 'recessed coatings 06; 06 ', e.g. B. recesses 04; 04 ', coatable.

In principle, an above-mentioned device for coating 07; 43, briefly coating device 07; 43, in particular a painting device 07 or an application device 43 for primer 06 ', according to any one for the coating agent 06; 06 ', in particular for the lacquer 06 or primer 06' to be applied, physically and chemically suitable coating methods work or be designed without a fixed coating form.

The coating device 07; 43 is based, however, on a selective removal of previously - in particular over the entire surface or in a continuous width - on the transport surface 08 one of the coating device 07; 43 in the coating agent path comprised of the application element 09 applied coating agent 06; 06 'at a point in the coating agent path of the coating device 07; 43, which lies in front of or upstream of the point of the order on the printing substrate 02. Although the application element 09 is also used as a circumferential belt or in some other way coating means 06; 06 'can be carried out continuously conveying, the selective removal of the coating agent 06; 06 'here preferably from the transport surface 08, which is embodied as a jacket surface 08, to the application of the coating agent 06; 06 'on the substrate 02 serving as a roller 09 application element 09, z. B. applicator roller 09. A device 07 operating according to the above principle; 43 is largely insensitive to physical or chemical differences in the spectrum used Coating agent 06; 06 '.

The application element 09, which is preferably designed as an application roller 09, has a smooth and / or hard surface in the region of its lateral surface 08 which can be used or is effective for coating. The hardness should have at least a degree of hardness of 800 HRV, preferably at least 1000 HRV and / or the smoothness should have a roughness of at most Rz10, in particular at most Rz2. The roller 09 or at least the outer surface 08 which can be used or which is effective for the coating is preferably made of ceramic.

The application element 09, which is preferably designed as an application roller 09, is assigned a - preferably mechanically effective - removal device 11, in particular a doctor blade device 11, by means of which coating agent 06; 06 'selectively before the downstream delivery to the printing substrate 02, d. H. in one or more sections a, which are only partial widths compared to the application width, clocked to the machine and / or printing material phase position for defined and / or definable phase lengths I, in particular only in defined, shorter compared to the circumferential length and compared to the usable roller width b09 and / or the application width - z. B. by at least a factor of ten, preferably at least a factor of fifty - narrower subregions 12, can be removed from the conveying surface again. A plurality of phase lengths I related to the utility phase position of a utility 01 can be used for removing the coating agent 06; 06 'be defined and / or definable.

For this purpose, several, z. B. at least ten, in particular at least 50, compared to the application width and / or in particular compared to a usable roller width b09 narrower, z. B. at least by a factor of 10 or even 50 compared to the application width and / or compared to the usable roller width b09 narrower removal elements 13, in particular doctor blades 13, are provided, which are or can be switched on and off in a clocked manner for feeding the printing substrate via actuators 14 controlled by control means of a control device 16. In this case, "clocked" should not be a strictly uniform sequence, but rather as a definable or defined correlation of the switching on / off to the relevant phase position. In principle, this correlation can range from a fixed and possibly even sequence over a large number of panels 01 to irregular sequences newly defined for each panel 01. The selective removal in the subareas 12 or in partial width sections a thus takes place in that, in tracks defined in the axial direction by the pickup elements 13, a limited subarea 12 is removed from the application elements 13 by means of temporary positioning of an individual or a group of application elements 13 that continue axially in their squeegee effect Coating agent 06 previously applied over the application width; 06 'of coating agent 06; 06 'can be released. In the meantime, removal elements 13 of other tracks remain switched off at the same time, so that the coating agent 06; 06 'remains in these tracks on the lateral surface 08 and z. B. can be delivered to the printing substrate 02 in the area of the contact zone 17 or is. Acceptance elements 13 are preferably provided in number and arrangement in such a way that a resolution, ie a variation of the acceptance width in steps of at most 10 mm, preferably of at most 6 mm, is achieved or can be achieved.

The removal element or removal elements 13 relating to a partial width of a track can preferably be switched on and off several times in relation to the length L01 of a panel 01. That is to say, on an unrolling length of the application roller 09 corresponding to the length L01 of a panel 01 currently to be coated, several pitch phases P _AN and several shutdown phases P _{AB can be} provided or run through. An example is in Fig. 2a a parking / parking sequence in an alignment F _X running through adhesive areas 03 (see e.g. Fig. 1 ) located x-th acceptance element 13x for the state Z of the parking position AN and parking position AB as a function of the use phase position dh, ie the relative phase position Φ of the utility 01 already printed upstream in the printing material path or still to be printed downstream relative to the coating device 07. In Figure 2b is an example of a turn-on-turn-off sequence in an alignment Fy running through pressure areas 05 (see e.g. Fig. 1 ) located y-th acceptance element 13y for the state Z of the parking position AN and parking position AB as a function of the use phase position Φ. In practice, the use phase position Φ can be based on a direct determination of the position of the use 01 or the printing material 02 itself or from a machine phase position, ie from phase position and / or movement information from the use 01 or printing material 02 defined to and / or by the coating device 07; 43 conveying means of transport or the machine itself. The use phase position Φ for controlling the clocked switching on / off is preferably obtained via information on the printing material or machine phase position and further processed accordingly by control means of a control device 16. For this purpose, the control device 16 is in signal connection with information about the means providing the printing material and / or the machine phase position.

The removal device 11 is preferably designed in such a way that, based on the circumferential or developed length of the applicator roller 09, a plurality of subregions 12 can be defined independently of one another in terms of their axial position and extent as well as their phase position and length and / or of coating agent 06; 06 'can be freed and / or that the coating agent 06; 06 'is detachable in terms of their axial position or extent and / or subregions 12 which differ in their phase position or length. The coating agent 06; 06 'effect free partial areas 12 - taking into account the transport path to be covered by coating agent 06; 06 'and printing substrate 02 - the coating agent-free areas 04 to be provided on printing substrate 02; 04 'or recesses 04; 04 '.

The application roller 09 and a printing material 02 to be coated can be brought into contact with one another in the area of a mutual contact zone 17 in order to be coated by the latter on the side facing the application roller 09. The contact zone 17 can be quasi-linear or flat, depending on the wrap. The application roller 09 preferably forms, with a counter roller 15, a nip point through which the printing material 02 to be coated can be passed and on the side facing the application roller 09 can be coated. The nip point then forms the contact zone 17 or, in the case of a partial looping, lies within the contact zone 17. The mating roller 15 is preferably formed with an elastic and / or compressible surface layer, at least in the area of its lateral surface that is usable and / or effective for the transport of the coating agent. It is preferably designed as a roller 15 with a rubber layer or rubber coating provided in at least the usable or effective lateral surface area.

The application roller 09 receives the coating agent 07; 43 by contact with a feed device 18 in the region of a contact zone 19 formed on the circumference of the applicator roller 09. The - in particular continuous - width over which the applicator roller 09 is fed by the feed device 18 with coating agent 06; 06 'is acted upon or can be acted upon, is also referred to in the following for short as the application width.

The feed device 18 can in principle directly through a coating agent reservoir, for. B. by a set or adjustable to the applicator roller 09 chamber doctor blade and the contact zone 19 by direct contact with the ink located therein, or by a tub-like container with coating agent 06; 06 ', into which the applicator roller 09 dips to a part forming the contact zone 19. In another embodiment, the feed device 18 can be provided by a type of spray bar, through which the applicator roller 09 is provided with coating agent 06; 06 'is applied.

In the embodiment preferred here, the application roller 09 receives the coating agent 06; 06 ', however, not directly from a coating agent reservoir, but from another roller 21 upstream with respect to the coating agent flow. The contact zone 19 relating to the coating agent supply to the applicator roller 09 is hereby the nip point between the two rollers 09; 21 formed. The roller 21 can in principle be designed as a dipping or anilox roller or cup roller and with a coating agent reservoir, e.g. B. a chamber doctor blade or an already o. G. Container be designed to work together. Preferably, however, it is designed as a transfer roller 21, which the coating agent 06; 06 'is received via a nip point with a further, upstream roller 23. The transfer roller 21 is preferably formed with an elastic and / or compressible surface layer 26, at least in the area of its lateral surface which can be used and / or which is effective for the transport of the coating agent. It is preferably designed as a roller 21 with a rubber layer 26 or rubber coating 26 provided in at least the usable or effective lateral surface area.

For the supply of the coating agent 06; 06 ′, in principle, several such rollers 21, in particular transfer rollers 21, can be provided one behind the other on the circumference of the applicator roller 09 and each form a contact zone 19 with it. In this case, a last contact zone 19 is to be understood as the last contact zone 19 passed through, seen in the operating direction of rotation of the application roller 09, before the contact zone 17 with the printing material 02 passed through.

In the preferred embodiment here, the only or last contact zone 19 with the feed device 18 and the only or first subsequent active point 22 of the removal device 11 on the circumference of the applicator roller 09 in the direction of rotation by at least several degrees, e.g. B. by at least 10 °, here preferably even by more than 45 °, provided spaced from one another.

The transfer roller 21 with coating agent 06; 06 'supplying roller 23 can in principle be a further roller 23 of a roller train continuing further upstream, at the end of which there is a coating agent reservoir already mentioned above, possibly variable in effective width. In the preferred embodiment here, however, it is designed as the last roller 23 upstream and is in the area of a contact zone with a coating agent reservoir with coating agent 06; 06 'applied. The width of application at this contact zone can be varied. Although the roller 23 can also be embodied as a dip roller immersed in a coating agent reservoir, it is preferably embodied as an anilox roller 23. To act upon it, the anilox roller 23 interacts with the coating agent reservoir of an application device 24 comprising a doctor blade, in particular with a chamber doctor blade 24.

Regardless of the special design and type of feed device 18, the application width can be fixed or adaptable to a variable width of the printing material. However, it can be provided that, given a variable printing substrate width for narrower printing substrates 02, coating agents 06; 06 'is removed or can be removed by lateral removal elements 13 continuously adjusted over the affected production situation.

The removal device 11 can in principle be designed in any desired manner in order to remove previously applied coating agents 06; 06 'selectively in - z. B. basically from benefit 01 to benefit 01 redefinable or defined sub-areas 12 of the coating agent layer initially applied to the lateral surface 08 of the applicator roller 09 over a continuous impact width to be removed again, for example to evaporate, dab off or suck off. In this context, the "decrease" or "removal" does not mean the removal of a partial layer, that is to say no dosed adjustment of a remaining layer thickness, but rather a taking into account the limits of the The means used can be removed with the least possible residue A “contact” accordingly has the meaning of an actual contact, in particular a force-loaded contact of the removal element 13 with the lateral surface 08.

Preferably, however, a doctor device 11 is provided as a removal device 11, which viewed in the axial direction of the applicator roller 09 has several, z. B. at least 10 mechanically independently of each other by respective actuators 14 in the circumferential area between the single or last contact zone 19 in the operating direction of rotation and the contact zone 17 on the outer surface 08 of the applicator roller 09 has squeegee blades 13 that can be switched on and off Be designed in the form of tongues of a doctor blade cut several times from one side. It can also be in a mixed form, with several doctor blades cut in this way being arranged next to one another.

The individual doctor blades 13 are switched on and off in particular by separately controllable actuators 14. Under the formulation of a turn-on and turn-off, that is, the moving of the squeegee blade 13 into a turn-on position AN or a turn-off position AB, by the respective actuator 13, solutions should also fall in which only one actuating direction is actively accomplished by the actuator 14, e.g. B. an adjustment, so moving the squeegee blade 13 in an adjustment position AN, while the other direction takes place by resetting when the actuator 14 is inactive, for example resetting by spring force or gravity.

To control the squeegee device 11 or the actuators 14 assigned to the squeegee blades 13, a control device 16 which acts on the actuators 14 and activates and deactivates, in particular switches on and off, the removal elements 13 in a clocked manner to the printing substrate and / or machine phase position according to a predeterminable pattern is provided. The pattern of activation or adjustment corresponds to the coating agent-free areas 04 to be taken into account on panel 01; 04 'or Recesses 04; 04 '. When passing through the jacket area in the pattern, the recesses 04; 04 'one or more doctor blades 13 individually or in groups for one of the length of the recess 04; 04 'adjusted circumferential section corresponding to the lateral surface 08 and then turned off again. The width of the individual or the group of doctor blades 13 corresponds to the width of the recess 04; 04 '. The pattern for adjusting the squeegee blades 13 is derived, for example, from the data on which the previous print is based, e.g. B. print image data or raw data obtained and correlated with the substrate or machine phase position.

In principle, any drive means can be provided as actuators 14. Advantageously, however, pressure medium-operated actuators 14, for. B. pneumatic or hydraulic actuating means, or electromagnetic actuating means 14, in particular electromagnets 14, electromagnets are provided. The electromagnets 14 can preferably be switched at a frequency of at least 100 Hz.

The removal device 11, designed as a doctor device 11, is preferably offset on the circumference of the applicator roller 09; H. arranged at a distance from the contact zone 19 with the feed device 18. Regardless of its specific configuration, the doctor device 11 comprises at least ten doctor blades 13, which can be adjusted independently of one another in axially offset tracks on the lateral surface 08, as removal elements 13.

The squeegee blades 13 of the squeegee device 11 can in principle all be arranged in an axially extending row in alignment with one another. A gapless arrangement is advantageous here, so that, if possible, no coating agent 06; 06 'remains on the lateral surface 08.

In an advantageous development shown, there are two rows running axially Squeegee blades 13 spaced apart from one another by at most one squeegee width are arranged offset from one another in the circumferential direction so that the tracks running in the circumferential direction through the squeegee blades 13 in the position AN on the circumferential surface 08 continue or preferably overlap in the axial direction at least uninterruptedly. The overlap can be 0.5 to 2 mm, for example. The two rows of squeegee blades 13, together with their drive mechanism and the bearing, form a first and second squeegee arrangement 11.1 in the operating direction of rotation; 11.2 from.

In an advantageous embodiment, doctor blades 13 with a width of their effective edge of 5 to 7 mm, in particular 6 mm, are arranged axially spaced from one another by 3 to 5 mm, in particular 4 mm, in the respective row. The rows are arranged one behind the other in such a way that the squeegee blades 13 of the one row or squeegee arrangement 11.1; 11.2 centrally to the interruption of the other row or doctor blade arrangement 11.2; 11.1 come to rest.

Preferably, at least 250 such doctor blades 13 are provided per row and / or a total of at least 500 doctor blades 13 are provided for forming 500 axially offset, advantageously overlapping tracks.

With several, z. B. two, on the circumference offset rows is taken into account in the control or when turning on and off the resulting over the rotational speed.

The control of the switching on and off is or is, in an advantageous embodiment, based on the control of the inkjet heads 36; 37; 38; 39 or printhead groups 36; 37; 38; 39 coupled.

An edge-side termination of the row of doctor blades 13 is preferably such that its edge-side end is spaced inwardly from the front side of the Application roller 09 lies, but protrudes laterally beyond the alignment of a maximum width of printing material to be coated.

The squeegee blades 13, which can be switched on and off independently of one another, can in principle be used in any way, directly or indirectly, in or on a frame 27 of the coating device 07; 43 be mounted in such a way that they can be put on and off again with their active edge in the intended tracks against the lateral surface 08. This can be implemented, for example, by means of an articulated mounting of the doctor blades 13 on a cross member 28.

In a preferred embodiment, the squeegee blades 13 are fixed directly or via elastically deformable holding means 29 on a cross member 28 and are reversibly deformed by the respective associated actuators 14 of the squeegee blade 13 and / or the holding means 29 with their active edge between an adjustment and a storage position AN ; AB relocatable. If retaining means 29 different from the doctor blade 13 are provided, these can be implemented by individual resilient sheet metal or spring sheet metal stiffeners 29 or by tongues 29 of a spring steel sheet 31 cut several times on one side (see e.g. Fig. 9 ). The respective doctor blade 13 is fastened to the relevant holding means 29 via a fastening means 46.

Centrally or directly in or on the frame 27 of the coating device 07; 43, the actuators 14 are also mounted in such a way that they can come into direct or indirect operative contact with the doctor blades 13 or their holding means 29. They are, for example, also arranged on the cross member 28 and interact with a magnetically attractable surface which is provided on the doctor blade 13 or on the holding means 29 that may be provided. This can be, for example, a surface opposite the inactive electromagnet 14 via a gap on one leg 48 of an L-shaped tension element 47, which is arranged with its other leg 48 on the holding means 29 or the doctor blade 13. This execution takes place a defined bending of the squeegee blade holding means arrangement when the pulling element 47 is tilted. The L-shaped pulling element 47 can be designed in such a way that it at the same time includes the fastening means 46 which, for example, form a clamping connection.

A coating device 07 mentioned above; 43, by means of which the printing material 02 carrying the panel 01 is based on digital data according to a - preferably indirect - method based on a selective removal of previously applied coating agent, d. H. without a fixed form of coating, with areas 04 free of coating agents which can be varied in number and / or size and / or shape and / or position; 04 'or recesses 04; 04 ′ can be coated, is provided in a preferred application in a printing machine which comprises a printing material supply 32, a printing unit 33, inkjet printing unit 33 for short, and a product receptacle 34 that works and / or can be operated according to a non-impact method.

Such a printing unit 33 can have several printing points and / or inkjet print heads or print head groups 36; 37; 38; 39, by means of which the printing material 02 can be printed in multiple colors one after the other. Through the printing material supply 32, for. B. a sheet feeder or in particular a roll unwinder 32, to be printed, sheet-like or preferably web-shaped printing material 02 can be supplied on the input side, while the printed and coated printing material 02 can be further processed through the product receptacle 34 and / or in a container, e.g. B. in a stack or in particular by being designed as a roll winder 34 in a winding roll, can be combined.

The coating device 07, embodied as a lacquer device 07, for example, is arranged downstream of the printing unit 33 and in particular a dryer 41 arranged downstream of the printing unit 33 in the printing material path and is arranged upstream of the product receptacle 34. Between the coating device 07 and the product receptacle 34 For example, a dryer 42 acting on the coated printing substrate side can be provided on the printing substrate path. An application device 43 for the application of the so-called primer 06 ′, possibly with a downstream dryer 44, can be provided upstream of the printing unit 33 in the printing material path and can be designed as a coating device 43 in the above manner.

When coating a printing substrate 02 printed with one or more panels 01 with a coating agent 06; 06 ', in particular a lacquer 06 or a primer 06', the coating is thus carried out on the basis of digital data according to a - preferably indirect - method based on a selective removal of previously applied coating agent, i. H. without a fixed form of coating, with areas 04 free of coating agents which can be varied in number and / or size and / or shape and / or position; 04 'or recesses 04; 04 '. In particular, this takes place in that an application roller 09, which interacts with the printing material 02 for coating it, is provided on a continuous roller width b09 with coating agent 06; 06 'is applied, the applied coating agent 06; 06 'is selectively removed again in partial areas 12 from the outer surface 08 of the application roller 09 before reaching the contact zone 17 formed with the printing substrate 02, and then the coating agent 06; 06 'at least in part, i. H. the layer thickness taken over by the printing substrate 02 during the roll-off contact is transferred to the printing substrate 02 in contact with the latter.

In this case, the removal is preferably carried out by adding subsets of the number of axially offset, mechanically independent of each other on the outer surface 08 of the applicator roller 09 removal elements 13, in particular squeegee blades 13, clocked for the use phase position or after coating, ie in which the coating device 07; 43 comprehensive machine upstream or downstream, inline in a non-impact process, in particular in the inkjet process, one or printed several times.

The described coating device 07; 43 can also optionally be operated or used for full-surface coating, with all or at least the removal elements 13 aligned with the printing material width and / or panel width remaining inactive or switched off over the panel length L01 or even over the production period in this operating mode. In the event that the width of the panel 01 or printing substrate 02 is smaller than the maximum possible printing material width or panel width, acceptance elements 13 located laterally to the printing material alignment or panel alignment can be activated or engaged for the production period concerned.

List of reference symbols

01

Benefit, copy

02

Substrate, substrate web

03

Adhesive area

04

Area, coating-free, recess

04 '

Area, coating-free, recess

05

Area, pressure area

06

Coating agents, varnish

06 '

Coating agents, primers

07

Device for coating, coating device, lacquer device, digital

08

Transport surface, outer surface

09

Application element, roller, application roller

10

-

11

Removal device, doctor blade device

11.1

Doctor blade assembly, first

11.2

Doctor blade assembly, second

12th

Sub-area

13th

Take-off element, squeegee blade

14th

Actuator, adjusting means, electromagnet

15th

Roller, counter roller

16

Control device

17th

Contact zone (02; 09)

18th

Feeding device

19th

Contact zone (09; 21)

20th

-

21

Roller, transfer roller

22nd

Point of action (13; 09)

23

Roller, anilox roller

24

Application device, chamber doctor blade

25th

-

26th

Surface layer, rubber layer, rubber coating

27

Frame (07; 43)

28

traverse

29

Holding means, sheet metal strips, spring sheet metal strips, tongue

30th

-

31

Spring plate

32

Substrate feed, roll unwinder

33

Printing unit, inkjet printing unit

34

Product intake, roll winder

35

-

36

Inkjet printhead, printhead group

37

Inkjet printhead, printhead group

38

Inkjet printhead, printhead group

39

Inkjet printhead, printhead group

40

-

41

dryer

42

dryer

43

Device for coating, coating device, application device, digital

44

dryer

45

-

46

Fasteners

47

Tension element

48

leg

a

Section, axial section

I.

Phase length (in transport direction)

AT

Line

FROM

Storage shelf

PAN

Employment phase

PAB

Parking phase

FX

Alignment in the transport direction at an umpteenth acceptance element

Fy

Alignment in the transport direction on a yth pick-up element

L01

Length (01)

b09

Roller width

T

Transport direction

Z

Status

Φ

Phasing, benefit phasing

Claims (15)

1. A device for coating a printing substrate (02), printed or to be printed with one or more copies (01), with a coating medium (06; 06'), in particular a varnish (06) or a primer (06'), said device comprising

   - a roller (09)

   - and a feed system (18) for supplying the roller (09) with coating medium (06, 06'), which system cooperates with the roller (09), in the region of at least one contact zone (19) on the periphery of said roller, to apply coating medium (06; 06') that will be applied to the printing substrate (02) to the lateral surface (08) of the roller (09) in a continuous layer over an application width,

   - a removal device (11) assigned to the roller (09) and having removal elements (13), which are controllable separately via a control device (16), and by means of which coating medium (06; 06') applied previously by the feed system (18) to the lateral surface (08), in a continuous layer over the application width, can be removed again from the lateral surface (08) selectively, i.e. in one or more sections of partial width relative to the application width, in synchronization with the press phase position and/or printing substrate phase position for defined and/or definable phase lengths (l), prior to the transfer downstream,

   characterized in that

   - the roller (09), as a form roller (09), can be brought into rolling contact, in the region of a tangency zone (17), with the printing substrate (02) to be coated, in order to coat said printing substrate on the side thereof that faces the form roller (09),

   - the coating medium (06; 06') that has been applied by the feed system (18) to the lateral surface (08) in a continuous layer over the application width can be removed selectively prior to the downstream transfer of said coating medium to the printing substrate (02),

   - in that the removal device (11), as viewed in the axial direction of the form roller (09), has a plurality of removal elements (13), which can be activated and deactivated mechanically independently of one another by respective actuators (14), in particular can be engaged against and disengaged from the lateral surface (08) of the form roller (09) in the circumferential region between the sole or the last contact zone (19) with the feed system (18) in the operational direction of rotation and the tangency zone (17) with the printing substrate (02), wherein as the removal device (11), a doctor blade device (11) is provided, which is arranged on the periphery of the form roller (09), offset from the contact zone (19) with the sole or last feed system (18), and/or which comprises as removal elements (13) at least ten doctor blades (13), which can be engaged independently of one another against the lateral surface (08) in tracks that are offset from one another axially.
2. The device according to claim 1, characterized in that the removal device (11) is positioned to cooperate with the form roller (09) in the circumferential region between the sole or last contact zone (19) with the feed system (18) in the operational direction of rotation and the tangency zone (17) with the printing substrate (02).
3. The device according to claim 1, characterized in that a control device (16) is provided, which acts on the actuators (14) to activate and deactivate, in particular to engage and disengage the removal elements (13), in synchronization with the printing substrate phase position and/or press phase position, according to a pre-definable pattern, and/or in that electromagnets (14) are provided as actuators (14).
4. The device according to claim 1, characterized in that two axially extending rows of doctor blades (13), which are spaced apart from one another by no more than one doctor blade width, are arranged offset from one another in the circumferential direction such that the tracks extending in the circumferential direction on the lateral surface (08) when the doctor blades (13) are in the engaged position continue at least uninterrupted or preferably overlap, as viewed in the axial direction, and/or in that the doctor blades (13), which can be engaged and disengaged independently of one another, are held on a cross-member (28) directly or via elastically deformable holding means (29), and can be moved between an engaged position (ON) and a disengaged position (OFF) by the respectively associated actuators (14), under reversible deformation of the doctor blade (13) and/or the holding means (29).
5. The device according to claim 1, 2, 3 or 4, characterized in that the form roller (09) has a smooth and/or hard surface over the entire area of its lateral surface (08) that is used for coating.
6. The device according to claim 1, 2, 3, 4 or 5, characterized in that the feed system (18) comprises a roller (21) that forms the contact zone (19) with the form roller (09).
7. The device according to claim 1, 2, 3, 4, 5 or 6, characterized by its configuration as a varnish-coating device (07) for coating already printed printing substrate (02) with a varnish (06) as the coating medium (06), or by its configuration as an application device (43) for coating an as yet unprinted printing substrate (02) with a primer (06') as the coating medium (06') .
8. A printing press having a printing substrate feed system (32) by which printing substrate (02) to be printed can be fed in on the intake side, a printing unit (33) that operates and/or can be operated according to a non-impact method, and a product receiving unit (34), by means of which the printed printing substrate (02) can be further processed and/or can be collected in a bundle, wherein at least one coating device (07; 43) is provided upstream of the printing unit (33) in the printing substrate path and/or is provided downstream of the printing unit (33) and can be used to coat the printing substrate that will be printed with the copy (01) downstream or which has already been printed with the copy upstream, wherein the coating device (07; 43) for coating the printing substrate (02), printed or to be printed with one or more copies (01), with a coating medium (06; 06'), in particular a varnish (06) or a primer (06'), comprises a form roller (09), which can be brought into rolling contact, in the region of a tangency zone (17), with the printing substrate (02) to be coated, in order to coat said printing substrate on the side thereof that faces the form roller (09), and a feed system (18) for supplying the form roller (09) with coating medium (06; 06'), which cooperates with the form roller (09) in the region of at least one contact zone (19) on the periphery of said roller, in order to apply coating medium (06; 06') that will be applied to the printing substrate (02) to the lateral surface (08) of the form roller (09), in a continuous layer over an application width, characterized in that the printing substrate (02) can be coated, on the basis of digital data, with one or more areas (04; 04') without coating, said areas being variable in terms of number and/or size and/or shape and/or position, without the use of a fixed coating form and based upon a selective removal of previously applied coating medium (06), and in that the form roller (09) is assigned a removal device (11) having removal elements (13), which can be controlled separately via a control device (16) and by means of which coating medium, applied previously by the feed system (18) to the lateral surface (08), in a continuous layer over the application width, can be removed again from the lateral surface (08) selectively i.e. in one or more sections of partial width relative to the application width, in synchronization with the press phase position and/or printing substrate phase position for defined and/or definable phase lengths (l), prior to the downstream transfer of said coating medium (06, 06') onto the printing substrate (02).
9. The printing press according to claim 8, characterized in that the coating device (07; 43) is embodied in accordance with the device according to any of claims 2 to 14.
10. The printing press according to claim 8 or 9, characterized in that the coating device (07) located downstream of the printing unit (33) in the printing substrate path is embodied as a varnishing device (07) for applying varnish (06) to printed printing substrate (02).
11. The printing press according to claim 8, 9 or 10, characterized in that the coating device (43) located upstream of the printing unit (33) in the printing substrate path is embodied as an application device (43) for applying primer (06') to the printing substrate (02) to be printed downstream.
12. A method for coating a printing substrate (02), already printed or still to be printed with one or more copies (01), with a coating medium (06; 06') other than printing ink, in particular a varnish (06) or a primer (06), wherein the coating is carried out on the basis of digital data, based upon a selective removal of previously applied coating medium (06), using an application element (09) and without a fixed coating form, with areas (04; 04') without coating, said areas being variable in terms of number and/or size and/or shape and/or position, characterized in that

    - coating medium (06; 06') is applied over a continuous width to a lateral surface (08) of a form roller (09), which cooperates with the printing substrate (02) in a tangency zone (17) formed between form roller (09) and printing substrate (02) for the purpose of coating said printing substrate, and which has a smooth surface in the region of its lateral surface (08) that is used for the purpose of coating,

    - the applied coating medium (06; 06') is selectively removed again from subsections (12) of the lateral surface (08) of the form roller (09) before a tangency zone (17) formed with the printing substrate (02) is reached,

    - and then the coating medium (06; 06') left on the lateral surface (08) is transferred at least partially to the printing substrate (02) at the point of physical contact therewith.
13. The method according to claim 12, characterized in that the removal is accomplished by the engagement, synchronized with a phase position (φ) of the copy (01) that has already been printed upstream or has yet to be printed downstream in the printing substrate path, of subsets of a number of removal elements (13), which are arranged offset from one another axially and which can be brought mechanically independently of one another into operative contact with, and/or can be engaged against and disengaged from, the lateral surface (08) of the form roller (09).
14. The method according to claim 12 or 13, characterized in that the printing substrate (02) is printed in a printing press by a non-impact method, in particular by the inkjet method, and is selectively coated, in particular varnished, downstream by means of a coating device (07) according to a method based on a selective removal of previously applied coating medium (06) .
15. The method according to claim 12, 13 or 14, characterized in that the printing substrate (02) is selectively coated, in particular with primer (06'), in a printing press by means of the coating device (43) according to a method based on a selective removal of previously applied coating medium (06), and downstream is printed by a non-impact method, in particular by the inkjet method.

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