EP3072700A1 - Method for the regulated and controlled re-dampening and drying of paper webs - Google Patents

Method for the regulated and controlled re-dampening and drying of paper webs Download PDF

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Publication number
EP3072700A1
EP3072700A1 EP16160471.5A EP16160471A EP3072700A1 EP 3072700 A1 EP3072700 A1 EP 3072700A1 EP 16160471 A EP16160471 A EP 16160471A EP 3072700 A1 EP3072700 A1 EP 3072700A1
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EP
European Patent Office
Prior art keywords
drying
printing material
elements
relative humidity
printing
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Granted
Application number
EP16160471.5A
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German (de)
French (fr)
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EP3072700B1 (en
EP3072700B2 (en
Inventor
Andreas Elchlepp
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Manroland Goss Web Systems GmbH
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Manroland Web Systems GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • 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
    • B41F23/02—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening
    • 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
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing

Definitions

  • the invention relates to a method for changing the relative humidity of a printing material by means of a drying unit comprising a number of drying elements, which are arranged transversely to the transport direction of the printing substrate and are directed to the printing material to dry each with a drying intensity, wherein the drying elements can be controlled individually and a method for changing the relative humidity of a substrate by means of a moistening device comprising a number of moistening elements, which are arranged transversely to the transport direction of the substrate and are directed to the substrate to moisten this with a respective amount of moisture, wherein the humidifying elements can be controlled individually.
  • this leads to the problem that the paper either behaves extremely differently with respect to the electrostatics or is very wavy. But it can also be a problem that due to the partially high humidity of the paper no electrostatics are used for example for blocking successive leaves or signatures, since the electrostatic is dissipated at higher substrate density.
  • drying units which dry the printing material by means of heating elements are therefore used in the prior art.
  • drying unit for a printing material web.
  • a number of drying elements is provided, which are positioned transversely to the printing material web.
  • Each of these drying elements comprises a heating element to heat the ambient air and a fan, which directs the warm air in the direction of the printing material.
  • the printing material which is guided past the drying unit, even or the color can be dried.
  • For a uniform drying temperature across the web width sensors are provided in the drying elements that measure the air temperature. These data are used to adjust the speed of the individual drying elements in such a way that a uniform temperature distribution and thus drying is made possible.
  • Such a device can not prevent the printing material web or the pressure after drying has a non-uniform moisture distribution.
  • Such a device thus results in that in the case of unequal humidity the areas of high humidity can be dried, but at the same time the areas of not so high or normal humidity (about 2% to 5% relative humidity) become stronger due to lack of solvent / water application be dried so that the residual moisture of the paper, for example, below 2% relative humidity decreases.
  • such dry paper also has unfavorable mechanical properties because it is very brittle and stiff, and thus can also be processed poorly.
  • the invention is therefore an object of the invention to provide a method for changing the relative humidity of a substrate of the type mentioned above, which allows the simplest possible way a particularly uniform drying of the printing material or the printing, so that one for the printing material and the Further processing optimum and uniform degree of drying is achieved with a desired residual moisture.
  • At least two drying elements are controlled such that at least two areas are applied transversely to the transport direction of the substrate with a different drying intensity and / or at least two moistening elements are controlled such that at least two areas transverse to the transport direction of the substrate with a different amount of moisture are applied.
  • the invention is based on the consideration that the entry of solvent / water is dependent on the application of paint. Since the color is not applied evenly, the moisture is not evenly distributed on the substrate, but changes both in printing material direction and across it and is usually inhomogeneous in both directions. It has been recognized that for the same drying time, the areas of high humidity must be dried to a greater extent than the areas of lower humidity or, in an alternative or additional embodiment, the areas of lower humidity must be moistened correspondingly stronger before or after drying. For this reason, the plurality of drying elements or moistening elements arranged transversely to the printing material direction are adjusted in such a way that the drying intensity, ie the temperature provided for drying or moistening intensity, ie the amount of moisture, varies. In this case, at least two areas or zones are provided transversely to the printing material direction, which are acted upon by a different drying or moistening intensity.
  • the drying elements or the moistening elements are controlled on the basis of measured data of a sensor unit in a particularly preferred embodiment.
  • the relative humidity of the printing material is determined in a preferred embodiment.
  • the sensor unit may also consist of a number of sensor elements which are arranged transversely to the transport direction of the printing material. The sensor elements measure the relative humidity of a single area of the substrate.
  • a control unit can then, based on the measurement data of each individual area, control the drying or moistening element assigned to this area and determine the optimum drying intensity or moisture quantity so that the printing material web then has a substantially constant distribution of the relative humidity transversely to the transport direction.
  • the waviness of the web can also be detected and from it the moisture can be indirectly determined. Since the solvent / water entry in the inkjet process depends on the subject, the locations of high humidity are to be equated with those of a high color occupancy. Thus, as sensor elements and optical sensors for detecting the locations of different color assignment can be used.
  • the control of the drying elements or of the moistening elements is carried out on the basis of stored or entered print data or precursor data.
  • the printing material speed and the path of the printing material can be taken into account in order to achieve optimally timed control of the drying elements or moistening elements.
  • the drying elements or moistening elements are also controlled so that at least two areas are acted upon in the transport direction of the printing material with a different drying intensity or moisture.
  • the advantages achieved by the invention are in particular that by the different drying or moistening of individual areas transversely to or in the transport direction of the printing material, which can be compensated in the context of the printing process inhomogeneous relative humidity of the printing material. As a result, a substantially uniform and constant distribution of the relative humidity is achieved. Also, by the individual control of the drying and moistening a desired and optimal for further processing residual moisture of the printing material can be achieved.
  • FIG. 1 a drying unit 1 for a printing material web is shown, which reduces the relative humidity of the printing substrate 2 to a desired, adjustable value.
  • the drying unit 1 is specifically designed so that the relative humidity of the printing material web 2 after passing through the printing material web 2 by the drying unit 1 and the width B of the printing substrate 2 has a substantially constant value.
  • the drying unit 1 after the FIG. 1 a sensor unit 6 in the form of a sensor bar, whose measuring range extends over the entire width B of the printing substrate 2 and the relative humidity or a another measured variable, from which the relative humidity of the printing material web 2 can be determined directly or indirectly.
  • the sensor unit 6 according to the embodiment of FIG. 1 and FIG. 2 In this case, it comprises a multiplicity of sensor elements 8 arranged next to one another, each of which measures a defined section of the printing material web 2.
  • the sensor unit 6 may also comprise a single sensor element 8 or a number of sensor elements 8, which are or arranged transversely to the transport direction x of the printing substrate 2 traversing.
  • the sensor unit 6 is connected to an evaluation unit 10 via a data line 12, via which the measurement data of the sensor elements 8 are sent to the evaluation unit 10 and control commands can also be sent to the sensor unit 6 by the evaluation unit 10 or a control module, not shown ,
  • the evaluation unit 10 generates from the measured data a profile of the relative humidity of the printing material web 2 across the width B of the printing material web 2 and determines from these values an optimal setting for the drying strip 4 in order to achieve the desired relative residual moisture of the printing substrate web B.
  • the drying bar 4 for this purpose also comprises a number of drying elements 14, which are arranged side by side and substantially over the entire width B of the printing material web 2 and are designed such that they reduce the relative humidity of the printing material web 2 in a respective assigned area.
  • Each of these drying elements 12 can be controlled individually and the drying intensity can be adjusted individually, so that the desired target profile of the relative humidity can be achieved by controlling the drying elements 12 in an optimum manner from the determined actual profile of the relative humidity of the printing material web 2.
  • the drying bar on the data side is also connected via a data line 16 to the evaluation unit 10 or a control module, not shown, of the evaluation unit 10 in order to transmit control commands to the individual drying elements 12.
  • the drying unit 1 may also comprise a moistening strip 18. Such a configuration of the drying unit 1 is in FIG. 2 shown.
  • the moistening strip 18 also comprises a number of adjacent moistening elements 20, which are arranged substantially over the entire width B of the printing material web 2 and can moisten the printing material web 2 in a respectively assigned area, so that the relative humidity of the printing substrate web 2 is increased.
  • This humidification unit 18 is also connected on the data side to the evaluation unit 10 via a data line 22 so that control signals from the evaluation unit 10 or a control module, not shown, of the evaluation unit can be transmitted to the humidification strip 18.
  • the substrate web is now not lowered or dried to a relative humidity substantially constant over the width B of the printing material web 2, but the moisture of the printing material web 2 is increased in individual regions, so that a uniform distribution of the relative humidity is achieved.
  • a drying bar 24 is provided to reduce the relative humidity of the printing material to the desired target value.
  • This drying bar 24 can also be as in FIG. 1 illustrated include a number of individually controllable drying elements 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Ink Jet (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Ein Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) mittels einer Trocknungseinheit (1), die eine Anzahl von Trocknungselementen (14) umfasst, die quer zur Transportrichtung (x) des Bedruckstoffs (2) angeordnet sind und auf den Bedruckstoff (2) gerichtet sind, um diesen jeweils mit einer Trocknungsintensität zu trocknen, wobei durch die einzelne Ansteuerung der Trocknungselemente (14) auf möglichst einfache Art und Weise eine besonders gleichmäßige Trocknung der Bedruckstoffbahn bzw. des Drucks ermöglicht werden soll, so dass ein für die Bedruckstoffbahn und die weitere Verarbeitung optimaler und gleichmäßiger Trocknungsgrad mit einer gewünschten Restfeuchte erzielt wird. Dazu werden mindestens zwei Trocknungselemente (14) derart angesteuert, dass mindestens zwei Bereiche quer zur Transportrichtung (x) des Bedruckstoffs (2) mit einer unterschiedlichen Trocknungsintensität beaufschlagt werden.A method for changing the relative humidity of a printing material (2) by means of a drying unit (1) comprising a number of drying elements (14) which are arranged transversely to the transport direction (x) of the printing material (2) and onto the printing material (2) are directed to dry each with a drying intensity, with the single control of the drying elements (14) in the simplest possible way a particularly uniform drying of the printing material or the print should be allowed, so that one for the printing material and the Further processing optimum and uniform degree of drying is achieved with a desired residual moisture. For this purpose, at least two drying elements (14) are controlled such that at least two regions transverse to the transport direction (x) of the printing material (2) are subjected to a different drying intensity.

Description

Die Erfindung betrifft ein Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs mittels einer Trocknungseinheit, die eine Anzahl von Trocknungselementen umfasst, die quer zur Transportrichtung des Bedruckstoffs angeordnet sind und auf den Bedruckstoff gerichtet sind, um diesen jeweils mit einer Trocknungsintensität zu trocknen, wobei die Trocknungselemente einzeln angesteuert werden können und ein Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs mittels einer Befeuchtungseinrichtung, die eine Anzahl von Befeuchtungselementen umfasst, die quer zur Transportrichtung des Bedruckstoffs angeordnet sind und auf den Bedruckstoff gerichtet sind, um diesen jeweils mit einer Feuchtigkeitsmenge zu befeuchten, wobei die Befeuchtungselemente einzeln angesteuert werden können.The invention relates to a method for changing the relative humidity of a printing material by means of a drying unit comprising a number of drying elements, which are arranged transversely to the transport direction of the printing substrate and are directed to the printing material to dry each with a drying intensity, wherein the drying elements can be controlled individually and a method for changing the relative humidity of a substrate by means of a moistening device comprising a number of moistening elements, which are arranged transversely to the transport direction of the substrate and are directed to the substrate to moisten this with a respective amount of moisture, wherein the humidifying elements can be controlled individually.

Bei Digitaldruckmaschinen, die insbesondere nach dem Inkjet-Druckverfahren arbeiten, werden mit der Farbe relativ hohe Mengen an Flüssigkeit auf den Bedruckstoff aufgetragen und dringen in diesen ein, was insbesondere bei größeren Einträgen von Wasser als Lösemittel der Druckfarbe in Papier zu Problemen führen kann. Dabei sind insbesondere die Ausdehnung des Papiers sowohl in Längsrichtung als auch quer zur Faserrichtung, das Bilden von sogenannten Wassersäcken, d.h. durch die Dehnung verursachte Längung und die Veränderung der mechanischen Eigenschaften des Papiers zu beachten. Dies führt im Laufe der weiteren Verarbeitung des Bedruckstoffs zu Problemen und damit auch Qualitätseinbußen im Endprodukt und beispielsweise zum Verwerfen des Bedruckstoffs bei einem in Bedruckstoffrichtung gesehenen asymmetrischen bzw. ungleichen Farbauftrag aufgrund von sehr hoher Welligkeit des Papiers.In digital printing machines, which operate in particular by the inkjet printing process, relatively high amounts of liquid are applied to the substrate with the ink and penetrate into this, which can lead to problems especially with larger inputs of water as a solvent of the printing ink in paper. In particular, the expansion of the paper both in the longitudinal direction and transverse to the fiber direction, the formation of so-called water bags, i. elongation caused by the elongation and the change in mechanical properties of the paper must be taken into account. This leads in the course of further processing of the printing material to problems and thus also quality losses in the final product and, for example, discarding of the printing substrate at a printing material direction seen asymmetric or uneven ink application due to very high waviness of the paper.

Durch die Feuchtigkeit kann sowohl der Druckprozess als auch der nachgeschaltete Nachverarbeitungsprozess beeinflusst werden. In der Nachverarbeitung führt dies beispielsweise zu der Problematik, dass sich das Papier entweder extrem unterschiedlich bezüglich der Elektrostatik verhält oder sehr wellig ist. Es kann aber auch ein Problem sein, dass aufgrund der teilweise hohen Feuchtigkeit des Papiers keine Elektrostatik beispielsweise zum Verblocken aufeinander liegender Blätter oder Signaturen verwendet werden, da die Elektrostatik bei höherer Bedruckstoffdichte abgeführt wird.Moisture can influence both the printing process and the downstream post-processing process. In post-processing, for example, this leads to the problem that the paper either behaves extremely differently with respect to the electrostatics or is very wavy. But it can also be a problem that due to the partially high humidity of the paper no electrostatics are used for example for blocking successive leaves or signatures, since the electrostatic is dissipated at higher substrate density.

Um die Feuchtigkeit des Bedruckstoffs zu reduzieren, werden im Stand der Technik daher Trocknungseinheiten eingesetzt, die mittels Heizelementen den Bedruckstoff trocknen.In order to reduce the moisture content of the printing material, drying units which dry the printing material by means of heating elements are therefore used in the prior art.

Aus der Druckschrift WO 2014/046665 ist beispielsweise eine derartige Trocknungseinheit für eine Bedruckstoffbahn offenbart. Dabei ist eine Anzahl von Trocknungselementen vorgesehen, die quer zur Bedruckstoffbahn positioniert sind. Jedes dieser Trocknungselemente umfasst dabei ein Heizelement, um die Umgebungsluft aufzuheizen und einen Ventilator, der die warme Luft in Richtung der Bedruckstoffbahn lenkt. Auf diese Art und Weise kann die Bedruckstoffbahn, die an der Trocknungseinheit vorbei geführt wird, selbst oder die Farbe getrocknet werden. Für eine möglichst gleichmäßige Trocknungstemperatur über die Bahnbreite sind Sensoren in den Trocknungselementen vorgesehen, die die Lufttemperatur messen. Diese Daten werden dazu verwendet, die Geschwindigkeit der einzelnen Trocknungselemente derart einzustellen, dass eine gleichmäßige Temperaturverteilung und somit Trocknung ermöglicht wird.From the publication WO 2014/046665 For example, such a drying unit for a printing material web is disclosed. In this case, a number of drying elements is provided, which are positioned transversely to the printing material web. Each of these drying elements comprises a heating element to heat the ambient air and a fan, which directs the warm air in the direction of the printing material. In this way, the printing material, which is guided past the drying unit, even or the color can be dried. For a uniform drying temperature across the web width sensors are provided in the drying elements that measure the air temperature. These data are used to adjust the speed of the individual drying elements in such a way that a uniform temperature distribution and thus drying is made possible.

Eine derartige Vorrichtung kann allerdings nicht verhindern, dass die Bedruckstoffbahn bzw. der Druck auch nach der Trocknung eine ungleichmäßige Feuchtigkeitsverteilung aufweist. Je nach Ausgangsfeuchte kann es dabei allerdings auch bei der Druckschrift WO 2014/046665 weiterhin zu Bereichen kommen, die eine Grenzfeuchtigkeit überschreiten und im Gegensatz dazu zu anderen Bereichen, die zu trocken sind und somit die Eigenschaften der Bedruckstoffbahn ebenfalls beeinträchtigen. Eine derartige Vorrichtung führt somit dazu, dass bei ungleicher Feuchtigkeit zwar die Bereiche hoher Feuchtigkeit getrocknet werden können, aber gleichzeitig die Bereiche nicht so hoher bzw. normaler Feuchtigkeit (ca. 2% bis 5% relative Feuchtigkeit) aufgrund fehlendem Lösungsmittel/Wasser Auftrag umso stärker ausgetrocknet werden, so dass die Restfeuchtigkeit des Papieres auf beispielsweise unter 2% relative Feuchte absinkt. Derart trockenes Papier hat aber ebenfalls ungünstige mechanische Eigenschaften, da es sehr spröde und steif ist, und lässt sich somit ebenfalls schlecht verarbeiten.However, such a device can not prevent the printing material web or the pressure after drying has a non-uniform moisture distribution. Depending on the initial moisture content, however, it may also be in the publication WO 2014/046665 continue to come to areas that exceed a limit moisture and in contrast to other areas that are too dry and thus also affect the properties of the substrate web. Such a device thus results in that in the case of unequal humidity the areas of high humidity can be dried, but at the same time the areas of not so high or normal humidity (about 2% to 5% relative humidity) become stronger due to lack of solvent / water application be dried so that the residual moisture of the paper, for example, below 2% relative humidity decreases. However, such dry paper also has unfavorable mechanical properties because it is very brittle and stiff, and thus can also be processed poorly.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs der oben genannten Art anzugeben, das auf möglichst einfache Art und Weise eine besonders gleichmäßige Trocknung der Bedruckstoffbahn bzw. des Drucks ermöglicht, so dass ein für die Bedruckstoffbahn und die weitere Verarbeitung optimaler und gleichmäßiger Trocknungsgrad mit einer gewünschten Restfeuchte erzielt wird.The invention is therefore an object of the invention to provide a method for changing the relative humidity of a substrate of the type mentioned above, which allows the simplest possible way a particularly uniform drying of the printing material or the printing, so that one for the printing material and the Further processing optimum and uniform degree of drying is achieved with a desired residual moisture.

Diese Aufgabe wird erfindungsgemäß gelöst, indem mindestens zwei Trocknungselemente derart angesteuert werden, dass mindestens zwei Bereiche quer zur Transportrichtung des Bedruckstoffs mit einer unterschiedlichen Trocknungsintensität beaufschlagt werden und/oder mindestens zwei Befeuchtungselemente derart angesteuert werden, dass mindestens zwei Bereiche quer zur Transportrichtung des Bedruckstoffs mit einer unterschiedlichen Feuchtigkeitsmenge beaufschlagt werden.This object is achieved by at least two drying elements are controlled such that at least two areas are applied transversely to the transport direction of the substrate with a different drying intensity and / or at least two moistening elements are controlled such that at least two areas transverse to the transport direction of the substrate with a different amount of moisture are applied.

Die Erfindung geht von der Überlegung aus, dass der Eintrag von Lösemittel/Wasser vom Farbauftrag abhängig ist. Da auch die Farbe nicht gleichmäßig aufgetragen wird, ist auch die Feuchtigkeit nicht gleichmäßig auf den Bedruckstoff verteilt, sondern verändert sich sowohl in Bedruckstoffrichtung als auch quer dazu und ist üblicherweise in beiden Richtungen inhomogen. Es wurde dabei erkannt, dass bei gleicher Trocknungsdauer die Bereiche hoher Feuchtigkeit stärker getrocknet werden müssen, als die Bereiche geringerer Feuchtigkeit oder aber in alternativer oder zusätzlicher Ausgestaltung die Bereiche geringerer Feuchtigkeit vor oder nach dem Trocknen entsprechend stärker befeuchtet werden müssen. Aus diesem Grund werden die mehreren quer zur Bedruckstoffrichtung angeordneten Trocknungselemente oder Befeuchtungselemente derart eingestellt, dass die Trocknungsintensität, also die bereitgestellte Temperatur zur Trocknung, bzw. Befeuchtungsintensität, also die Feuchtigkeitsmenge, variiert. Dabei sind mindestens zwei Bereiche bzw. Zonen quer zur Bedruckstoffrichtung vorgesehen, die mit einer unterschiedlichen Trocknungs- oder Befeuchtungsintensität beaufschlagt werden.The invention is based on the consideration that the entry of solvent / water is dependent on the application of paint. Since the color is not applied evenly, the moisture is not evenly distributed on the substrate, but changes both in printing material direction and across it and is usually inhomogeneous in both directions. It has been recognized that for the same drying time, the areas of high humidity must be dried to a greater extent than the areas of lower humidity or, in an alternative or additional embodiment, the areas of lower humidity must be moistened correspondingly stronger before or after drying. For this reason, the plurality of drying elements or moistening elements arranged transversely to the printing material direction are adjusted in such a way that the drying intensity, ie the temperature provided for drying or moistening intensity, ie the amount of moisture, varies. In this case, at least two areas or zones are provided transversely to the printing material direction, which are acted upon by a different drying or moistening intensity.

Für eine optimale Trocknung des Bedruckstoffs bzw. eine möglichst konstante Restfeuchtigkeit des Bedruckstoffs wird in besonders bevorzugter Ausführung die Steuerung der Trocknungselemente bzw. der Befeuchtungselemente auf Basis von Messdaten einer Sensoreinheit vorgenommen. Dabei wird in bevorzugter Ausgestaltung die relative Feuchte des Bedruckstoffs bestimmt. Dabei kann die Sensoreinheit ebenfalls aus einer Anzahl von Sensorelementen bestehen, die quer zur Transportrichtung des Bedruckstoffs angeordnet sind. Die Sensorelemente messen dabei die relative Feuchte eines einzelnen Bereiches des Bedruckstoffs. Eine Steuereinheit kann anschließend auf Basis der Messdaten jedes einzelnen Bereiches, das diesen Bereich zugeordneten Trocknungs- oder Befeuchtungselement ansteuern und die optimale Trocknungsintensität bzw. Feuchtigkeitsmenge bestimmen, damit die Bedruckstoffbahn anschließend quer zur Transportrichtung eine im Wesentlichen konstante Verteilung der relativen Feuchte aufweist.For optimal drying of the printing substrate or a residual moisture of the printing material which is as constant as possible, the drying elements or the moistening elements are controlled on the basis of measured data of a sensor unit in a particularly preferred embodiment. In this case, the relative humidity of the printing material is determined in a preferred embodiment. In this case, the sensor unit may also consist of a number of sensor elements which are arranged transversely to the transport direction of the printing material. The sensor elements measure the relative humidity of a single area of the substrate. A control unit can then, based on the measurement data of each individual area, control the drying or moistening element assigned to this area and determine the optimum drying intensity or moisture quantity so that the printing material web then has a substantially constant distribution of the relative humidity transversely to the transport direction.

Neben der Sensoreinheit zur Messung der relativen Feuchte, kann auch die Welligkeit der Bahn detektiert werden und aus ihr die Feuchtigkeit indirekt bestimmt werden. Da beim Inkjet-Verfahren der Lösemittel-/Wasser-Eintrag vom Sujet abhängig ist, sind die Stellen hoher Feuchtigkeit mit den Stellen einer hohen Farbbelegung gleichzusetzen. Somit können als Sensorelemente auch optische Sensoren zur Erfassung der Stellen unterschiedlicher Farbbelegung zum Einsatz kommen.In addition to the sensor unit for measuring the relative humidity, the waviness of the web can also be detected and from it the moisture can be indirectly determined. Since the solvent / water entry in the inkjet process depends on the subject, the locations of high humidity are to be equated with those of a high color occupancy. Thus, as sensor elements and optical sensors for detecting the locations of different color assignment can be used.

Aufgrund des direkten Zusammenhangs zwischen Farbbelegung und Feuchtigkeit bzw. Feuchtigkeitseintrag können die Bereiche hoher Feuchtigkeit auch aus den Druckdaten bzw. Vorstufendaten generiert werden, da Stellen mit hoher Farbbelegung einem hohen Feuchtigkeitsauftrag, Stellen mit mittlerer Farbbelegung einem mittleren Feuchtigkeitsauftrag und Stellen mit geringer Farbbelegung einem geringeren Feuchtigkeitsauftrag etc. entsprechen. Aus diesem Grund wird in alternativer oder zusätzlicher vorteilhafter Ausgestaltung die Steuerung der Trocknungselemente bzw. der Befeuchtungselemente auf Basis von hinterlegten oder eingegebenen Druckdaten oder Vorstufendaten vorgenommen. Dabei kann zusätzlich die Bedruckstoffgeschwindigkeit und der Weg des Bedruckstoffs berücksichtigt werden, um eine zeitlich optimal abgestimmte Steuerung der Trocknungselemente bzw. Befeuchtungselemente zu erreichen.Due to the direct relationship between ink coverage and moisture or moisture entry areas of high humidity can also be generated from the print data or precursor data, since places with high color occupancy a high humidity order, sites with medium color occupancy of a moderate moisture application and places with low color occupancy a lower moisture order etc. correspond. For this reason, in an alternative or additional advantageous embodiment, the control of the drying elements or of the moistening elements is carried out on the basis of stored or entered print data or precursor data. In addition, the printing material speed and the path of the printing material can be taken into account in order to achieve optimally timed control of the drying elements or moistening elements.

Um eine Veränderung der Farbbelegung in Transportrichtung des Bedruckstoffs zu berücksichtigen, werden in bevorzugter Ausführung die Trocknungselemente bzw. Befeuchtungselemente auch derart angesteuert, dass mindestens zwei Bereiche in Transportrichtung des Bedruckstoffs mit einer unterschiedlichen Trocknungsintensität bzw. Feuchtigkeitsmenge beaufschlagt werden.In order to take into account a change in the ink coverage in the transport direction of the printing material, in a preferred embodiment, the drying elements or moistening elements are also controlled so that at least two areas are acted upon in the transport direction of the printing material with a different drying intensity or moisture.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass durch die unterschiedliche Trocknung bzw. Befeuchtung einzelner Bereiche quer zur oder auch in Transportrichtung des Bedruckstoffs, die im Rahmen des Druckprozesses inhomogene relative Feuchte des Bedruckstoffs ausgeglichen werden kann. Dadurch wird eine im Wesentlichen gleichmäßige und konstante Verteilung der relativen Feuchte erreicht. Auch kann durch die individuelle Steuerung der Trocknungs- und Befeuchtungselemente eine gewünschte und für die weitere Verarbeitung optimale Restfeuchtigkeit des Bedruckstoffs erreicht werden.The advantages achieved by the invention are in particular that by the different drying or moistening of individual areas transversely to or in the transport direction of the printing material, which can be compensated in the context of the printing process inhomogeneous relative humidity of the printing material. As a result, a substantially uniform and constant distribution of the relative humidity is achieved. Also, by the individual control of the drying and moistening a desired and optimal for further processing residual moisture of the printing material can be achieved.

Ein Ausführungsbeispiel einer Erfindung wird anhand einer Zeichnung näher erläutert. Darin zeigen:

  • Figur 1 eine Trocknungseinheit mit einer Sensorleiste und einer Trocknungsleiste,
  • Figur 2 eine Trocknungseinheit mit einer zusätzlichen Befeuchtungsleiste.
An embodiment of an invention will be explained in more detail with reference to a drawing. Show:
  • FIG. 1 a drying unit with a sensor bar and a drying bar,
  • FIG. 2 a drying unit with an additional wetting strip.

Gleiche Teile sind in allen Figuren mit denselben Bezugszeichen versehen.Identical parts are provided with the same reference numerals in all figures.

In Figur 1 ist eine Trocknungseinheit 1 für eine Bedruckstoffbahn dargestellt, die die relative Feuchte der Bedruckstoffbahn 2 auf einen gewünschten, einstellbaren Wert reduziert. Dabei ist die Trocknungseinheit 1 gezielt dazu ausgelegt, dass die relative Feuchte der Bedruckstoffbahn 2 nach Durchlauf der Bedruckstoffbahn 2 durch die Trocknungseinheit 1 und über die Breite B der Bedruckstoffbahn 2 einen im Wesentlichen konstanten Wert aufweist.In FIG. 1 a drying unit 1 for a printing material web is shown, which reduces the relative humidity of the printing substrate 2 to a desired, adjustable value. The drying unit 1 is specifically designed so that the relative humidity of the printing material web 2 after passing through the printing material web 2 by the drying unit 1 and the width B of the printing substrate 2 has a substantially constant value.

Neben einer Trocknungsleiste 4 weist die Trocknungseinheit 1 nach der Figur 1 eine Sensoreinheit 6 in Form einer Sensorleiste auf, deren Messbereich sich über die gesamte Breite B der Bedruckstoffbahn 2 erstreckt und die relative Feuchte oder eine andere Messgröße, aus der direkt oder indirekt die relative Feuchte der Bedruckstoffbahn 2 bestimmt werden kann, misst. Die Sensoreinheit 6 nach dem Ausführungsbeispiel der Figur 1 und Figur 2 umfasst dabei eine Vielzahl von nebeneinander angeordneten Sensorelementen 8, die jeweils einen definierten Teilabschnitt der Bedruckstoffbahn 2 messen. In alternativer Ausführung kann die Sensoreinheit 6 auch eine einzelnes Sensorelement 8 oder eine Anzahl von Sensorelementen 8 umfassen, das bzw. die quer zur Transportrichtung x der Bedruckstoffbahn 2 traversierend angeordnet sind. Die Sensoreinheit 6 ist datenseitig mit einer Auswerteeinheit 10 über eine Datenleitung 12 verbunden, über die die Messdaten der Sensorelemente 8 an die Auswerteeinheit 10 gesendet werden und auch bei Bedarf Steuerbefehle von der Auswerteeinheit 10 bzw. einem nicht dargestellten Steuermodul an die Sensoreinheit 6 gesendet werden können.In addition to a drying bar 4, the drying unit 1 after the FIG. 1 a sensor unit 6 in the form of a sensor bar, whose measuring range extends over the entire width B of the printing substrate 2 and the relative humidity or a another measured variable, from which the relative humidity of the printing material web 2 can be determined directly or indirectly. The sensor unit 6 according to the embodiment of FIG. 1 and FIG. 2 In this case, it comprises a multiplicity of sensor elements 8 arranged next to one another, each of which measures a defined section of the printing material web 2. In an alternative embodiment, the sensor unit 6 may also comprise a single sensor element 8 or a number of sensor elements 8, which are or arranged transversely to the transport direction x of the printing substrate 2 traversing. On the data side, the sensor unit 6 is connected to an evaluation unit 10 via a data line 12, via which the measurement data of the sensor elements 8 are sent to the evaluation unit 10 and control commands can also be sent to the sensor unit 6 by the evaluation unit 10 or a control module, not shown ,

Die Auswerteeinheit 10 erstellt aus den Messdaten ein Profil der relativen Feuchte der Bedruckstoffbahn 2 über die Breite B der Bedruckstoffbahn 2 und ermittelt aus diesen Werten eine optimale Einstellung für die Trocknungsleiste 4, um die gewünschte relative Restfeuchte der Bedruckstoffbahn B zu erzielen. Die Trocknungsleiste 4 umfasst dazu ebenfalls eine Anzahl von Trocknungselementen 14, die nebeneinander und im Wesentlichen über die gesamte Breite B der Bedruckstoffbahn 2 angeordnet sind und derart ausgebildet sind, dass sie die relative Feuchte der Bedruckstoffbahn 2 in einem jeweils zugeordneten Bereich senken. Jedes dieser Trocknungselemente 12 kann dabei einzeln angesteuert werden und die Trocknungsintensität einzeln eingestellt werden, sodass in optimaler Art und Weise aus dem ermittelten Ist-Profil der relativen Feuchte der Bedruckstoffbahn 2, das gewünschte Zielprofil der relativen Feuchte durch Ansteuerung der Trocknungselemente 12 erreicht werden kann. Dazu ist die Trocknungsleiste datenseitig ebenfalls über eine Datenleitung 16 mit der Auswerteeinheit 10 bzw. einem nicht dargestellten Steuermodul der Auswerteeinheit 10 verbunden, um Steuerbefehle an die einzelnen Trocknungselemente 12 zu übertragen.The evaluation unit 10 generates from the measured data a profile of the relative humidity of the printing material web 2 across the width B of the printing material web 2 and determines from these values an optimal setting for the drying strip 4 in order to achieve the desired relative residual moisture of the printing substrate web B. The drying bar 4 for this purpose also comprises a number of drying elements 14, which are arranged side by side and substantially over the entire width B of the printing material web 2 and are designed such that they reduce the relative humidity of the printing material web 2 in a respective assigned area. Each of these drying elements 12 can be controlled individually and the drying intensity can be adjusted individually, so that the desired target profile of the relative humidity can be achieved by controlling the drying elements 12 in an optimum manner from the determined actual profile of the relative humidity of the printing material web 2. For this purpose, the drying bar on the data side is also connected via a data line 16 to the evaluation unit 10 or a control module, not shown, of the evaluation unit 10 in order to transmit control commands to the individual drying elements 12.

Mit einer derartigen Trocknungseinheit 1 ist es somit möglich eine unterschiedliche Verteilung der relativen Feuchte einer Bedruckstoffbahn 2 (dargestellt durch eine unterschiedlich intensive Grauschattierung auf der Bedruckstoffbahn 2) in Abhängigkeit der relativen Feuchte zu trocknen, sodass eine homogene relative Restfeuchteverteilung der Bedruckstoffbahn 2 erzielt werden kann.With such a drying unit 1, it is thus possible to dry a different distribution of the relative humidity of a printing material web 2 (represented by a different intensity gray shade on the printing material web 2) as a function of the relative humidity, so that a homogeneous relative residual moisture distribution of the printing material web 2 can be achieved.

In alternativer oder zusätzlicher Ausführung kann die Trocknungseinheit 1 auch eine Befeuchtungsleiste 18 umfassen. Eine derartige Ausgestaltung der Trocknungseinheit 1 ist in Figur 2 dargestellt.In an alternative or additional embodiment, the drying unit 1 may also comprise a moistening strip 18. Such a configuration of the drying unit 1 is in FIG. 2 shown.

Auch die Befeuchtungsleiste 18 umfasst eine Anzahl von nebeneinander liegenden Befeuchtungselementen 20, die im Wesentlichen über die gesamte Breite B der Bedruckstoffbahn 2 angeordnet sind und die Bedruckstoffbahn 2 in einem jeweils zugeordneten Bereich befeuchten kann, so dass die relative Feuchte der Bedruckstoffbahn 2 erhöht wird. Auch diese Befeuchtungseinheit 18 ist datenseitig mit der Auswerteeinheit 10 über eine Datenleitung 22 verbunden, sodass Steuersignale von der Auswerteeinheit 10 bzw. einem nicht dargestellten Steuermodul der Auswerteeinheit an die Befeuchtungsleiste 18 übertragen werden können.The moistening strip 18 also comprises a number of adjacent moistening elements 20, which are arranged substantially over the entire width B of the printing material web 2 and can moisten the printing material web 2 in a respectively assigned area, so that the relative humidity of the printing substrate web 2 is increased. This humidification unit 18 is also connected on the data side to the evaluation unit 10 via a data line 22 so that control signals from the evaluation unit 10 or a control module, not shown, of the evaluation unit can be transmitted to the humidification strip 18.

Im Unterschied zu der Trocknungseinheit 1 nach Figur 1 wird nun allerdings nicht die Bedruckstoffbahn auf eine über die Breite B der Bedruckstoffbahn 2 im Wesentlichen konstante relative Feuchte gesenkt bzw. getrocknet, sondern die Feuchte der Bedruckstoffbahn 2 wird in einzelnen Bereichen erhöht, so dass eine gleichmäßige Verteilung der relativen Feuchte erzielt wird. In Transportrichtung x der Bedruckstoffbahn B nach der Befeuchtungsleiste 18 oder in alternativer, nicht dargestellter Form auch vor der Befeuchtungsleiste 18 ist eine Trocknungsleiste 24 vorgesehen, um die relative Feuchte der Bedruckstoffbahn auf den gewünschten Zielwert zu senken. Diese Trocknungsleiste 24 kann dabei auch wie in Figur 1 dargestellt eine Anzahl von einzeln ansteuerbaren Trocknungselementen 14 umfassen. Aufgrund der Angleichung der relativen Feuchte über die Breite B der Bedruckstoffbahn 2 durch die Befeuchtungsleiste 18, kann aber auch ein einzelnes Trocknungselement 14 verwendet werden, das sich über die Breite B der Bedruckstoffbahn 2 erstreckt. Zur Ansteuerung der Trocknungsleiste 24 ist diese ebenfalls datenseitig über eine Datenleitung 26 mit der Auswerteeinheit 10 verbunden.In contrast to the drying unit 1 after FIG. 1 However, the substrate web is now not lowered or dried to a relative humidity substantially constant over the width B of the printing material web 2, but the moisture of the printing material web 2 is increased in individual regions, so that a uniform distribution of the relative humidity is achieved. In the transport direction x of the substrate web B after the Befeuchtungsleiste 18 or in an alternative, not shown form before the Befeuchtungsleiste 18 a drying bar 24 is provided to reduce the relative humidity of the printing material to the desired target value. This drying bar 24 can also be as in FIG. 1 illustrated include a number of individually controllable drying elements 14. Due to the alignment of the relative humidity over the width B of the printing material web 2 by the moistening strip 18, however, it is also possible to use a single drying element 14 which extends across the width B of the printing material web 2. To control the drying bar 24, this is also connected on the data side via a data line 26 to the evaluation unit 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Trocknungseinheitdrying unit
22
Bedruckstoffbahnprinting material
44
Trocknungsleistedrying bar
66
Sensoreinheitsensor unit
88th
Sensorelementsensor element
1010
Auswerteeinheitevaluation
1212
Datenleitungdata line
1414
Trocknungselementdrying element
1616
Datenleitungdata line
1818
BefeuchtungsleisteBefeuchtungsleiste
2020
Befeuchtungselementmoistening
2222
Datenleitungdata line
2424
Trocknungsleistedrying bar
BB
Breite der BedruckstoffbahnWidth of the substrate web
xx
Transportrichtung der BedruckstoffbahnTransport direction of the printing material web

Claims (7)

Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) mittels einer Trocknungseinheit (1), die eine Anzahl von Trocknungselementen (14) umfasst, die quer zur Transportrichtung (x) des Bedruckstoffs (2) angeordnet sind und auf den Bedruckstoff (2) gerichtet sind, um diesen jeweils mit einer Trocknungsintensität zu trocknen, wobei die Trocknungselemente (14) einzeln angesteuert werden können,
dadurch gekennzeichnet, dass mindestens zwei Trocknungselemente (14) derart angesteuert werden, dass mindestens zwei Bereiche quer zur Transportrichtung (x) des Bedruckstoffs (2) mit einer unterschiedlichen Trocknungsintensität beaufschlagt werden.Method for changing the relative humidity of a printing material (2) by means of a drying unit (1) comprising a number of drying elements (14) which are arranged transversely to the transport direction (x) of the printing material (2) and directed onto the printing material (2) are in order to dry each with a drying intensity, wherein the drying elements (14) can be controlled individually,
characterized in that at least two drying elements (14) are controlled such that at least two regions transversely to the transport direction (x) of the printing material (2) are subjected to a different drying intensity. Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) mittels einer Befeuchtungseinrichtung (18), die eine Anzahl von Befeuchtungselementen (20) umfasst, die quer zur Transportrichtung (x) des Bedruckstoffs (2) angeordnet sind und auf den Bedruckstoff (2) gerichtet sind, um diesen jeweils mit einer Feuchtigkeitsmenge zu befeuchten, wobei die Befeuchtungselemente (20) einzeln angesteuert werden können,
dadurch gekennzeichnet, dass mindestens zwei Befeuchtungselemente (20) derart angesteuert werden, dass mindestens zwei Bereiche quer zur Transportrichtung (x) des Bedruckstoffs (2) mit einer unterschiedlichen Feuchtigkeitsmenge beaufschlagt werden.Method for changing the relative humidity of a printing material (2) by means of a moistening device (20) comprising a number of moistening elements (20) which are arranged transversely to the transport direction (x) of the printing substrate (2) and directed onto the printing material (2) are each to moisten this with a moisture amount, wherein the moistening elements (20) can be controlled individually,
characterized in that at least two moistening elements (20) are controlled such that at least two regions transversely to the transport direction (x) of the printing substrate (2) are subjected to a different amount of moisture. Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuerung der Trocknungselemente (14) bzw. der Befeuchtungselemente (20) auf Basis von Messdaten einer Sensoreinheit (6) vorgenommen wird.Method for changing the relative humidity of a printing material (2) according to claim 1 or 2, characterized in that the control of the drying elements (14) or of the moistening elements (20) is carried out on the basis of measured data of a sensor unit (6). Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) nach Anspruch 3, dadurch gekennzeichnet, dass die Sensoreinheit (6) die relative Feuchte der Bedruckstoffbahn (2) misst.Method for changing the relative humidity of a printing material (2) according to claim 3, characterized in that the sensor unit (6) measures the relative humidity of the printing material web (2). Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuerung der Trocknungselemente (14) bzw. der Befeuchtungselemente (20) auf Basis von hinterlegten oder eingegebenen Druckdaten oder Vorstufendaten vorgenommen wird.Method for changing the relative humidity of a printing substrate (2) according to claim 1 or 2, characterized in that the control of the drying elements (14) or of the moistening elements (20) is carried out on the basis of stored or entered printing data or precursor data. Verfahren zur Änderung der relativen Feuchte eines Bedruckstoffs (2) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Trocknungselemente (14) bzw. Befeuchtungselemente (20) derart angesteuert werden, dass mindestens zwei Bereiche in Transportrichtung (x) des Bedruckstoffs (2) mit einer unterschiedlichen Trocknungsintensität bzw. Feuchtigkeitsmenge beaufschlagt werden.Method for changing the relative humidity of a printing material (2) according to one of claims 1 to 5, characterized in that the drying elements (14) or moistening elements (20) are controlled such that at least two regions in the transport direction (x) of the printing substrate ( 2) are subjected to a different drying intensity or amount of moisture. Vorrichtung zur Änderung der relativen Feuchte eines Bedruckstoffs (2) mit Mitteln ausgelegt zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 6.Device for changing the relative humidity of a printing material (2) with means designed to carry out the method according to one of Claims 1 to 6.
EP16160471.5A 2015-03-24 2016-03-15 Method for the regulated and controlled re-dampening and drying of paper webs Active EP3072700B2 (en)

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