EP3072700B2 - 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
EP3072700B2
EP3072700B2 EP16160471.5A EP16160471A EP3072700B2 EP 3072700 B2 EP3072700 B2 EP 3072700B2 EP 16160471 A EP16160471 A EP 16160471A EP 3072700 B2 EP3072700 B2 EP 3072700B2
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Prior art keywords
printing material
drying
elements
printing
transport direction
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EP16160471.5A
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German (de)
French (fr)
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EP3072700B1 (en
EP3072700A1 (en
Inventor
Andreas Elchlepp
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Manroland Goss Web Systems GmbH
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Manroland Goss 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 which comprises a number of drying elements which are arranged transversely to the transport direction of the printing material and are directed towards the printing material in order to dry it with a drying intensity in each case, the drying elements can be controlled individually and a moistening device that includes a number of moistening elements that are arranged transversely to the transport direction of the printing material and are directed towards the printing material in order to moisten it with a quantity of moisture, it being possible for the moistening elements to be controlled individually.
  • the moisture can affect both the printing process and the downstream post-processing.
  • post-processing for example, this leads to the problem that the paper either behaves extremely differently in terms of electrostatics or is very wavy.
  • it can also be a problem that, due to the sometimes high moisture content of the paper, no electrostatics are used, for example to block sheets or signatures lying on top of one another, since the electrostatics are dissipated with higher printing material density.
  • drying units are therefore used in the prior art, which dry the printing material by means of heating elements.
  • WO 2014/046665 discloses, for example, such a drying unit for a web of printing material.
  • a number of drying elements are provided, which are positioned transversely to the web of printing material.
  • Each of these drying elements includes a heating element to heat up the ambient air and a fan that directs the warm air in the direction of the web of printing material.
  • the printing material web which is guided past the drying unit, itself or the ink can be dried.
  • sensors are provided in the drying elements that measure the air temperature. This data is used to set the speed of the individual drying elements in such a way that an even temperature distribution and thus drying is made possible.
  • Such a device cannot prevent the printing material web or the print from having an uneven moisture distribution even after drying.
  • it can also occur with 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 printing material web.
  • Such a device means that if the humidity is not the same, the areas of high humidity can be dried, but at the same time the areas with less or normal humidity (approx. 2% to 5% relative humidity) all the more strongly due to the lack of solvent/water application be dried out, so that the residual moisture content of the paper drops to below 2% relative humidity, for example.
  • such dry paper also has unfavorable mechanical properties, since it is very brittle and stiff, and is therefore also difficult to process.
  • the invention is therefore particularly based on the document U.S. 2014/366760 A1
  • the object is to specify a method for changing the relative humidity of a printing material of the type mentioned above, which enables a particularly uniform drying of the printing material web or the print in the simplest possible way, so that an optimal and for the printing material web and further processing uniform degree of drying with a desired residual moisture is achieved.
  • At least two drying elements are controlled in such a way that at least two areas transverse to the transport direction of the printing material are subjected to a different drying intensity and at least two moistening elements are controlled in such a way that at least two areas transverse to the transport direction of the printing material are subjected to a different amount of moisture be applied.
  • the invention is based on the idea that the entry of solvents/water depends on the paint application. Since the ink is not applied evenly either, the moisture is not evenly distributed on the printing material, but changes both in the direction of the printing material and transversely to it and is usually inhomogeneous in both directions. It was recognized that for the same drying time, the areas of high moisture must be dried more than the areas of lower moisture and the areas of lower moisture must be moistened to a correspondingly greater extent before or after drying. For this reason, the several drying elements or moistening elements arranged transversely to the direction of the printing material 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. At least two areas or zones are provided transversely to the direction of the printing material, which are subjected to different drying or moistening intensities.
  • the drying elements or the moistening elements are controlled on the basis of measured data from a sensor unit for optimum drying of the printing material or for the residual moisture content of the printing material to be as constant as possible.
  • the relative humidity of the printing material is determined.
  • the sensor unit can also consist of a number of sensor elements that are arranged transversely to the transport direction of the printing material. The sensor elements measure the relative humidity of a single area of the printing material. Based on the measurement data of each individual area, a control unit can then control the drying or moistening element assigned to this area and determine the optimal drying intensity or amount of moisture, so that the printing material web then has a substantially constant distribution of relative moisture transversely to the transport direction.
  • the waviness of the web can also be detected and the humidity can be indirectly determined from it. Since the solvent/water entry in the inkjet process depends on the subject, the areas of high moisture are to be equated with areas of high ink coverage. Thus, optical sensors can also be used as sensor elements for detecting the locations with different color assignments.
  • the areas of high moisture can also be generated from the print data or prepress data, since areas with high ink coverage have a high moisture application, areas with a medium ink coverage have a medium moisture application and areas with a low ink coverage have a lower moisture application etc. correspond.
  • the drying elements or the moistening elements are controlled on the basis of stored or input print data or preliminary stage data. In this case, the printing material speed and the path of the printing material can also 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 in such a way that at least two areas in the transport direction of the printing material are subjected to a different drying intensity or amount of moisture.
  • the advantages achieved with the invention are in particular that the different drying or moistening of individual areas transverse to or in the transport direction of the printing material, the inhomogeneous relative humidity of the printing material can be compensated during the printing process. This achieves an essentially uniform and constant distribution of the relative humidity. Individual control of the drying and moistening elements can also achieve a desired residual moisture level in the printing material that is optimal for further processing.
  • a drying unit 1 for a web of printing material is shown, which reduces the relative humidity of the web of printing material 2 to a desired, adjustable value.
  • the drying unit 1 is specifically designed so that the relative humidity of the printing material web 2 has a substantially constant value after the printing material web 2 has passed through the drying unit 1 and over the width B of the printing material web 2 .
  • the drying unit 1 after figure 1 a sensor unit 6 in the form of a sensor bar, the measuring range of which extends over the entire width B of the printing material web 2 and measures the relative humidity or 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 Figure 1 and Figure 2 comprises a multiplicity of sensor elements 8 arranged next to one another, which each measure a defined section of the printing material web 2 .
  • the sensor unit 6 can also include a single sensor element 8 or a number of sensor elements 8 which are/are arranged to traverse transversely to the transport direction x of the printing material web 2 .
  • 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, if required, control commands can also be sent from the evaluation unit 10 or a control module (not shown) to the sensor unit 6 .
  • evaluation unit 10 creates a profile of the relative humidity of printing material web 2 over width B of printing material web 2 and uses these values to determine an optimal setting for drying bar 4 in order to achieve the desired relative residual moisture content of printing material web B.
  • the drying bar 4 also includes a number of drying elements 14 which are arranged next to one another and essentially over the entire width B of the printing material web 2 and are designed in such a way that they reduce the relative humidity of the printing material web 2 in a respectively 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 optimally achieved from the determined actual profile of the relative humidity of the printing material web 2 by controlling the drying elements 12.
  • the drying bar is also connected on the data side via a data line 16 to the evaluation unit 10 or to a control module of the evaluation unit 10 (not shown) in order to transmit control commands to the individual drying elements 12.
  • the drying unit 1 can also include a moistening bar 18 .
  • a moistening bar 18 Such a design of the drying unit 1 is in figure 2 shown.
  • the moistening bar 18 also includes a number of moistening elements 20 next to one another, which are arranged essentially over the entire width B of the printing substrate web 2 and can moisten the printing substrate web 2 in a respectively assigned area, so that the relative humidity of the printing substrate web 2 is increased.
  • This moistening unit 18 is also connected on the data side to the evaluation unit 10 via a data line 22 so that control signals can be transmitted from the evaluation unit 10 or a control module of the evaluation unit (not shown) to the moistening bar 18 .
  • a drying bar 24 is provided in the transport direction x of the printing material web B after the moistening bar 18 or alternatively, not shown, before the moistening bar 18 in order to reduce the relative humidity of the printing material web to the desired target value.
  • This drying strip 24 can also be used as in figure 1 shown include a number of individually controllable drying elements 14.
  • a single drying element 14 can also be used, which extends over the width B of the printing material web 2.
  • the drying bar 24 it is also connected to the evaluation unit 10 on the data side via a data line 26 .

Landscapes

  • 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)

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 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 which comprises a number of drying elements which are arranged transversely to the transport direction of the printing material and are directed towards the printing material in order to dry it with a drying intensity in each case, the drying elements can be controlled individually and a moistening device that includes a number of moistening elements that are arranged transversely to the transport direction of the printing material and are directed towards the printing material in order to moisten it with a quantity of moisture, it being possible for the moistening elements to 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 the case of digital printing machines, which in particular work according to the inkjet printing process, relatively large amounts of liquid are applied to the printing material with the ink and penetrate into it, which can lead to problems, especially if larger amounts of water are used as a solvent for the printing ink in the 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 pockets, i.e. the elongation caused by the stretching and the change in the mechanical properties of the paper must be taken into account. In the course of further processing of the printing material, this leads to problems and thus also to loss of quality in the end product and, for example, to warping of the printing material if the ink application is asymmetrical or uneven when viewed in the direction of the printing material due to very high paper waviness.

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.The moisture can affect both the printing process and the downstream post-processing. In post-processing, for example, this leads to the problem that the paper either behaves extremely differently in terms of electrostatics or is very wavy. However, it can also be a problem that, due to the sometimes high moisture content of the paper, no electrostatics are used, for example to block sheets or signatures lying on top of one another, since the electrostatics are dissipated with higher printing material 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 in the printing material, drying units are therefore used in the prior art, which dry the printing material by means of heating elements.

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 pamphlet WO 2014/046665 discloses, for example, such a drying unit for a web of printing material. A number of drying elements are provided, which are positioned transversely to the web of printing material. Each of these drying elements includes a heating element to heat up the ambient air and a fan that directs the warm air in the direction of the web of printing material. In this way, the printing material web, which is guided past the drying unit, itself or the ink can be dried. To ensure that the drying temperature is as uniform as possible across the web width, sensors are provided in the drying elements that measure the air temperature. This data is used to set the speed of the individual drying elements in such a way that an even 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 cannot prevent the printing material web or the print from having an uneven moisture distribution even after drying. However, depending on the initial moisture content, it can also occur with 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 printing material web. Such a device means that if the humidity is not the same, the areas of high humidity can be dried, but at the same time the areas with less or normal humidity (approx. 2% to 5% relative humidity) all the more strongly due to the lack of solvent/water application be dried out, so that the residual moisture content of the paper drops to below 2% relative humidity, for example. However, such dry paper also has unfavorable mechanical properties, since it is very brittle and stiff, and is therefore also difficult to process.

Aus den Druckschriften DE 195 33 673 A1 , EP 2 258 553 A1 und DE 296 22 903 U1 sind Trocknungseinheiten bekannt, die eine über die Bahnbreite variable Trocknung ermöglichen. Ebenso sind aus den Druckschriften US 2014/366760 A1 und DE 199 01 801 A1 Konditionierungseinheiten bekannt, die eine Bedruckstoffbahn über die Bahnbreite variabel befeuchten können.From the pamphlets DE 195 33 673 A1 , EP 2 258 553 A1 and DE 296 22 903 U1 drying units are known which enable drying that is variable over the web width. Also from the pamphlets U.S. 2014/366760 A1 and DE 199 01 801 A1 Conditioning units are known that can variably moisten a printing material web across the web width.

Der Erfindung liegt daher insbesondere ausgehend von der Druckschrift US 2014/366760 A1 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 particularly based on the document U.S. 2014/366760 A1 The object is to specify a method for changing the relative humidity of a printing material of the type mentioned above, which enables a particularly uniform drying of the printing material web or the print in the simplest possible way, so that an optimal and for the printing material web and further processing uniform degree of drying with a desired residual moisture is achieved.

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 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 according to the invention in that at least two drying elements are controlled in such a way that at least two areas transverse to the transport direction of the printing material are subjected to a different drying intensity and at least two moistening elements are controlled in such a way that at least two areas transverse to the transport direction of the printing material are subjected to a different amount of moisture be 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 und 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- bzw. Befeuchtungsintensität beaufschlagt werden.The invention is based on the idea that the entry of solvents/water depends on the paint application. Since the ink is not applied evenly either, the moisture is not evenly distributed on the printing material, but changes both in the direction of the printing material and transversely to it and is usually inhomogeneous in both directions. It was recognized that for the same drying time, the areas of high moisture must be dried more than the areas of lower moisture and the areas of lower moisture must be moistened to a correspondingly greater extent before or after drying. For this reason, the several drying elements or moistening elements arranged transversely to the direction of the printing material 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. At least two areas or zones are provided transversely to the direction of the printing material, which are subjected to different drying or moistening intensities.

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.In a particularly preferred embodiment, the drying elements or the moistening elements are controlled on the basis of measured data from a sensor unit for optimum drying of the printing material or for the residual moisture content of the printing material to be as constant as possible. In a preferred embodiment, the relative humidity of the printing material is determined. The sensor unit can also consist of a number of sensor elements that are arranged transversely to the transport direction of the printing material. The sensor elements measure the relative humidity of a single area of the printing material. Based on the measurement data of each individual area, a control unit can then control the drying or moistening element assigned to this area and determine the optimal drying intensity or amount of moisture, so that the printing material web then has a substantially constant distribution of relative moisture 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 the humidity can be indirectly determined from it. Since the solvent/water entry in the inkjet process depends on the subject, the areas of high moisture are to be equated with areas of high ink coverage. Thus, optical sensors can also be used as sensor elements for detecting the locations with different color assignments.

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, the areas of high moisture can also be generated from the print data or prepress data, since areas with high ink coverage have a high moisture application, areas with a medium ink coverage have a medium moisture application and areas with a low ink coverage have a lower moisture application etc. correspond. For this reason, in an alternative or additional advantageous embodiment, the drying elements or the moistening elements are controlled on the basis of stored or input print data or preliminary stage data. In this case, the printing material speed and the path of the printing material can also 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 in such a way that at least two areas in the transport direction of the printing material are subjected to a different drying intensity or amount of 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 with the invention are in particular that the different drying or moistening of individual areas transverse to or in the transport direction of the printing material, the inhomogeneous relative humidity of the printing material can be compensated during the printing process. This achieves an essentially uniform and constant distribution of the relative humidity. Individual control of the drying and moistening elements can also achieve a desired residual moisture level in the printing material that is optimal for further processing.

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 is explained in more detail with reference to a drawing. Show in it:
figure 1
a drying unit with a sensor bar and a drying bar,
figure 2
a drying unit with an additional moistening bar.

Gleiche Teile sind in allen Figuren mit denselben Bezugszeichen versehen.Identical parts are provided with the same reference symbols 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 figure 1 a drying unit 1 for a web of printing material is shown, which reduces the relative humidity of the web of printing material 2 to a desired, adjustable value. The drying unit 1 is specifically designed so that the relative humidity of the printing material web 2 has a substantially constant value after the printing material web 2 has passed through the drying unit 1 and over the width B of the printing material web 2 .

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 figure 1 a sensor unit 6 in the form of a sensor bar, the measuring range of which extends over the entire width B of the printing material web 2 and measures the relative humidity or 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 Figure 1 and Figure 2 comprises a multiplicity of sensor elements 8 arranged next to one another, which each measure a defined section of the printing material web 2 . In an alternative embodiment, the sensor unit 6 can also include a single sensor element 8 or a number of sensor elements 8 which are/are arranged to traverse transversely to the transport direction x of the printing material web 2 . 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, if required, control commands can also be sent from the evaluation unit 10 or a control module (not shown) to the sensor unit 6 .

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.From the measurement data, evaluation unit 10 creates a profile of the relative humidity of printing material web 2 over width B of printing material web 2 and uses these values to determine an optimal setting for drying bar 4 in order to achieve the desired relative residual moisture content of printing material web B. For this purpose, the drying bar 4 also includes a number of drying elements 14 which are arranged next to one another and essentially over the entire width B of the printing material web 2 and are designed in such a way that they reduce the relative humidity of the printing material web 2 in a respectively 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 optimally achieved from the determined actual profile of the relative humidity of the printing material web 2 by controlling the drying elements 12. For this purpose, the drying bar is also connected on the data side via a data line 16 to the evaluation unit 10 or to a control module of the evaluation unit 10 (not shown) 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 of gray shading on the printing material web 2) depending on 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 can also include a moistening bar 18 . Such a design of the drying unit 1 is in figure 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 bar 18 also includes a number of moistening elements 20 next to one another, which are arranged essentially over the entire width B of the printing substrate web 2 and can moisten the printing substrate web 2 in a respectively assigned area, so that the relative humidity of the printing substrate web 2 is increased. This moistening unit 18 is also connected on the data side to the evaluation unit 10 via a data line 22 so that control signals can be transmitted from the evaluation unit 10 or a control module of the evaluation unit (not shown) to the moistening bar 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 figure 1 However, the printing material web is not lowered or dried to a relative humidity that is essentially constant over the width B of the printing material web 2, but the humidity of the printing material web 2 is increased in individual areas, so that a uniform distribution of the relative humidity is achieved. A drying bar 24 is provided in the transport direction x of the printing material web B after the moistening bar 18 or alternatively, not shown, before the moistening bar 18 in order to reduce the relative humidity of the printing material web to the desired target value. This drying strip 24 can also be used as in figure 1 shown include a number of individually controllable drying elements 14. Due to the equalization of the relative humidity over the width B of the printing material web 2 by the moistening strip 18, however, a single drying element 14 can also be used, which extends over the width B of the printing material web 2. In order to control the drying bar 24 , it is also connected to the evaluation unit 10 on the data side via a data line 26 .

BezugszeichenlisteReference List

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

Claims (5)

  1. A method for changing the relative dampness of a printing material (2) by means of a dampener (18), wherein the printing material is printed upstream of the dampener (18) and upstream of a drying unit (1) by means of a digital printing press operating in the inkjet printing process, wherein the dampener (18) comprises a plurality of dampening elements (20), which are arranged transversely to the transport direction (x) of the printing material (2) and are directed to the printing material (2) in order to dampen the latter in each case with a moisture quantity, wherein the dampening elements (20) can be controlled individually,
    wherein at least two dampening elements (20) are controlled in such a way that a different moisture quantity is applied to at least two areas transversely to the transport direction (x) of the printing material (2),
    wherein
    the drying unit (1) comprises a plurality of drying elements (14), which are arranged transversely to the transport direction (x) of the printing material (2) and are directed to the printing material (2) in order to dry the latter in each case with a drying intensity, wherein the drying elements (14) can be controlled individually,
    wherein at least two drying elements (14) is controlled in such a way that a different drying intensity is applied to at least two areas transversely to the transport direction (x) of the printing material (2).
  2. The method for changing the relative dampness of a printing material (2) according to claim 1, characterized in that the control of the drying elements (14) and/or of the dampening elements (20) is carried out on the basis of measurement data from a sensor unit (6) .
  3. The method for changing the relative dampness of a printing material (2) according to claim 2, characterized in that the sensor unit (6) measures the relative dampness of the printing material web (2).
  4. The method for changing the relative dampness of a printing material (2) according to claim 1, characterized in that the control of the drying elements (14) and/or of the dampening elements (20) is carried out on the basis of stored or input printing data or prepress data.
  5. The method for changing the relative dampness of a printing material (2) according to one of claims 1 to 4, characterized in that the drying elements (14) and/or dampening elements (20) are controlled in such a way that a different drying intensity or moisture quantity, respectively, is applied to at least two areas in the transport direction (x) of the printing material (2).
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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