EP1105295B1 - Device for powdering printed sheets with the aid of an electrostatic charge - Google Patents
Device for powdering printed sheets with the aid of an electrostatic charge Download PDFInfo
- Publication number
- EP1105295B1 EP1105295B1 EP99934658A EP99934658A EP1105295B1 EP 1105295 B1 EP1105295 B1 EP 1105295B1 EP 99934658 A EP99934658 A EP 99934658A EP 99934658 A EP99934658 A EP 99934658A EP 1105295 B1 EP1105295 B1 EP 1105295B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- accordance
- charging
- pressure roller
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
- B41F23/06—Powdering devices, e.g. for preventing set-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
Definitions
- the invention relates to a device for dusting printed sheets of paper or an equivalent material using a powder dusting device with the characteristics of the generic term of Claim 1.
- a powder dusting device is known from DE 44 27 904 A1 with which powder is electrostatically charged, before it is inflated onto a printed sheet of paper becomes. Electrostatically charged powder adheres better on paper sheets, but the adhesion should still improve become.
- DE 29 36 754 A1 describes a device for the electrostatic application of entrained gases Material particles known on a sheet of paper become. Doing so will near the sheet of paper electric field into which the material particles, especially powder is blown in. Because of the field lines the powder is directed onto the surface of the material web.
- DE 31 35 220 A1 is an application device known from powder particles on printed sheets of paper become where the bow on the non-pollinating Side is electrostatically charged. This has the Advantage that the charging bars are relatively close to the paper sheet can be arranged, but the paper sheet itself acts as an insulator. An arrangement of the charging bar on the opposite, i.e. side of the paper to be pollinated is possible, but the charging stick can only be used with one a relatively large distance from the arch, because a Free space for the gripping rapier to be retained got to.
- the invention has for its object a device to provide with which the printed sheet is more optimal can be pollinated.
- part of the powdering process which also includes the electrostatic charging of the paper sheet is calculated out of the sheet delivery device laid.
- the order of the powder is still in the delivery device instead. Due to the close proximity of the Charging device for the surface of the sheet to be powdered small bundled fields can be generated and on the Sheet of paper act and because of the small distances can the field strength exactly and thus the electrostatic Charging can be set accurately without it Discharges is coming.
- the charging device as Charging bar is formed.
- This charging stick can be used for one relatively easy to adapt to the paper quality, on the other hand, the distance of the charging rod to adjacent surface of the paper web is set very precisely become.
- an exchange of the charging stick e.g. to Repair and / or maintenance purposes possible without any problems.
- the Charging device in the area of the transport direction seen last impression roller of a rotary printing press intended.
- This has the main advantage that the Paper web is held by the platen roller and both for the holder as well as for the transport of the bow in this area no gripper is required, so the Charger arranged relatively close to the sheet of paper can be.
- the charging device lies on the counter-pressure roller directly opposite. This means that the paper sheet between the platen roller and the charger located.
- ionizing bars before Charging bar one or more ionizing bars provided are. These ionizing bars are used for discharge or Preparation of the sheet before loading using the Charging bar.
- the ionizing bars are with AC operated (about 6.5 kV) and serve mainly for an active discharge of the bow or the Sheet surface.
- the charging stick is with DC voltage operated (about 12 kV).
- the counter-pressure roller preferably consists of an electric one conductive material, e.g. made of metal, and is grounded.
- the Charging device, especially the charging stick, is positive charges or sends out positive ions.
- This structure has the essential advantage that one side of the sheet of paper can be grounded and on the other side of the Sheet of paper e.g. positive ions are applied and that negatively charged powder can be used.
- the electrostatically charged sheet is then either electrostatically e.g. negatively charged powder or applied unloaded powder. Has at electrostatically charged powder the powder to charge opposite to the printed area of the paper sheet Charge.
- the powder dusting device can be advantageous in front of a Bow roller can be arranged.
- the Powder dusting device in front of the drying section be arranged.
- the powdering device provided in front of a sheet braking device so that when braking the bow this already with powder is pollinated.
- the charger creates the width of the sheet adapted electrostatic field, the field to the Width of the arch is customizable. This way, at processing of narrow sheet damage e.g. the Back pressure roller or other machine equipment be prevented.
- reference numeral 1 is one Sheet delivery device referred to the last Counter-pressure roller 2 of a printing machine, not shown, e.g. a rotary printing press.
- a printing machine e.g. a rotary printing press.
- the Sheet delivery device 1 serves the purpose of the Printing machine coming, printed paper sheets 4 into one To stack piles on top of each other.
- the Sheet delivery device 1 in a manner known per se two mutually spaced, endless gripper chains 5, which are connected by transverse gripper carriages. The length of this measured transversely to the plane of the drawing in FIG.
- Each gripper carriage has a gripper 6, which too transporting paper sheets 4 at the front edge, as shown in Figure 2.
- the paper sheets 4 are dragged along by the grippers 6 so that the printed sheet side 7 ( Figure 2) shows the gripper 6, so that it is facing up in the stack.
- the Sheet delivery device 1 a powder dusting device 8 on, which is shown only schematically in Figure 1. With this powder dusting device 8 is on the pasted sheets of paper inflated 4 powders. The Powder dusting device 8 is at a distance from Sheet of paper 4 on which the gripper 6 runs past allows. This distance can be up to 15 cm.
- the charging device 11 is the one in FIG. 2 illustrated embodiment from a charging rod 15 and two ionizing bars 18 which are connected to the charging bar 15 are upstream to unload the sheet 4 bw. for the Prepare for charging.
- FIG. 3 shows a section of the counter-pressure roller 2 which the sheet of paper 4 rests.
- the platen roller 2 is grounded at 13.
- the counter-pressure roller 2 consists of an electrically conductive material so that the printed sheet side 7 opposite sheet side 14 with the ground 13 is connected flat.
- the charging bar 15 shows the charging bar 15 recognizable.
- This charging stick 15 e.g. positively charged ions 16 in the direction of passing sheet of paper 4. These positive ions 16 accumulate on the printed sheet side 7, whereby 14 negative ions 17 on the unprinted sheet side accumulate.
- FIG. 4 shows the paper sheet 4 immediately after the Transfer point 12, i.e. after the separation from the Counter pressure roller 5.
- the two sheet sides 7 and 14 carry the positive ions 16 and the negative ions 17.
- This Paper sheet 4 is now from the gripper 6 in the direction of Powder dusting device 8 transported, where then the Powder, which can be negatively charged, is inflated. It however, it is also conceivable to use unloaded powder.
- the paper sheet 4 at the electrostatic charge preferably over the entire surface of the Back pressure roller 2 is applied, which in turn is grounded. On this way the whole unprinted sheet side 14 is during the electrostatic charge is grounded. Since the Charger 11 in the immediate vicinity of printed sheet side 7 is arranged, can be optimal Alignment of the electrical field and an exact Setting the field strength can be guaranteed. There immediately after the electrostatic charging of the Paper sheet 4 this is lifted from the backing roller 2 the load is taken before it is balanced is flowing away.
- the powder can less loss and more targeted to the paper sheet 4 be applied.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Paper Feeding For Electrophotography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Description
Die Erfindung betrifft eine Vorrichtung zum Bestäuben von bedruckten Bogen aus Papier oder einem gleichwertigen Material mittels einer Puderbestäubungsvorrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a device for dusting printed sheets of paper or an equivalent material using a powder dusting device with the characteristics of the generic term of Claim 1.
Aus der DE 44 27 904 A1 ist ein Puderbestäubungsgerät bekannt geworden, mit welchem Puder elektrostatisch aufgeladen wird, bevor dieser auf einen bedruckten Papierbogen aufgeblasen wird. Zwar haftet elektrostatisch aufgeladener Puder besser an Papierbogen an, jedoch sollte das Haftvermögen noch verbessert werden. Aus der DE 29 36 754 A1 ist eine Vorrichtung zum elektrostatischen Auftragen von in einem Gasstrom mitgeführten Materialteilchen auf einen Papierbogen bekannt geworden. Dabei wird in der Nähe des Papierbogens ein elektrisches Feld erzeugt, in welches die Materialteilchen, insbesondere Puder eingeblasen wird. Aufgrund der Feldlinien wird der Puder auf die Oberfläche der Materialbahn gelenkt. A powder dusting device is known from DE 44 27 904 A1 with which powder is electrostatically charged, before it is inflated onto a printed sheet of paper becomes. Electrostatically charged powder adheres better on paper sheets, but the adhesion should still improve become. DE 29 36 754 A1 describes a device for the electrostatic application of entrained gases Material particles known on a sheet of paper become. Doing so will near the sheet of paper electric field into which the material particles, especially powder is blown in. Because of the field lines the powder is directed onto the surface of the material web.
Mit der DE 31 35 220 A1 ist eine Vorrichtung zum Aufbringen von Puderteilchen auf bedruckte Bogen aus Papier bekannt geworden, bei der der Bogen auf der nicht zu bestäubenden Seite elektrostatisch aufgeladen wird. Zwar hat dies den Vorteil, dass die Aufladestäbe relativ nahe am Papierbogen angeordnet sein können, jedoch wirkt der Papierbogen selbst als Isolator. Eine Anordnung des Aufladestabes auf der gegenüberliegenden, d.h. zu bestäubenden Seite des Papierbogens ist zwar möglich, jedoch kann der Aufladestab nur mit einem relativ großen Abstand zum Bogen angeordnet werden, da ein Freiraum für den vorbeieilenden Greifer beibehalten werden muss.DE 31 35 220 A1 is an application device known from powder particles on printed sheets of paper become where the bow on the non-pollinating Side is electrostatically charged. This has the Advantage that the charging bars are relatively close to the paper sheet can be arranged, but the paper sheet itself acts as an insulator. An arrangement of the charging bar on the opposite, i.e. side of the paper to be pollinated is possible, but the charging stick can only be used with one a relatively large distance from the arch, because a Free space for the gripping rapier to be retained got to.
Aus der DE-U-296 23 325 und der US-A-3,053,180 ist jeweils eine Einrichtung zum Bestäuben von Druckprodukten bekannt geworden.From DE-U-296 23 325 and US-A-3,053,180 each a device for dusting printed products is known become.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung bereit zu stellen, mit welcher der bedruckte Bogen optimaler bestäubt werden kann.The invention has for its object a device to provide with which the printed sheet is more optimal can be pollinated.
Diese Aufgabe wird erfindungsgemäß mit einer Vorrichtung gelöst, die die Merkmale des Anspruchs 1 aufweist. This object is achieved with a device solved, which has the features of claim 1.
Dies hat den wesentlichen Vorteil, dass die Aufladevorrichtung relativ nahe zur bedruckten Oberfläche angeordnet werden kann, da oberhalb dieser bedruckten Fläche noch kein Freiraum für eventuell vorbeieilende Greifer geschaffen werden muss. Diese Greifer befinden sich erst innerhalb der Bogenauslegeeinrichtung, wobei die Aufladevorrichtung außerhalb dieser Bogenauslegeeinrichtung sich befindet und somit der bestgeeignetste Ort ausgewählt werden kann. Außerdem hat sich gezeigt, dass eine elektrostatische Aufladung der bedruckten Seite des Bogens vorteilhafter ist als die Aufladung der Gegenseite, d.h. der nicht zu bepudernden Seite.This has the main advantage that the Charger relatively close to the printed surface can be arranged because above this printed area there is still no space for grippers that might hurry past must be created. These grippers are only now inside the sheet delivery device, the Charging device outside of this sheet delivery device is located and therefore the most suitable place is selected can be. It has also been shown that a electrostatic charging of the printed side of the sheet is more advantageous than charging the opposite side, i.e. the side not to be powdered.
Erfindungsgemäß wird also ein Teil des Bepuderungsvorganges, zu dem auch die elektrostatische Aufladung des Papierbogens gerechnet wird, aus der Bogenauslegeeinrichtung heraus verlegt. Der Auftrag des Puders findet jedoch nach wie vor in der Auslegeeinrichtung statt. Durch die unmittelbare Nähe der Aufladevorrichtung zur zu bepudernden Fläche des Bogens können kleine gebündelte Felder erzeugt werden und auf den Papierbogen einwirken und aufgrund der kleinen Entfernungen kann die Feldstärke exakt und somit die elektrostatische Aufladung genau eingestellt werden, ohne dass es zu Entladungen kommt. According to the invention, part of the powdering process which also includes the electrostatic charging of the paper sheet is calculated out of the sheet delivery device laid. However, the order of the powder is still in the delivery device instead. Due to the close proximity of the Charging device for the surface of the sheet to be powdered small bundled fields can be generated and on the Sheet of paper act and because of the small distances can the field strength exactly and thus the electrostatic Charging can be set accurately without it Discharges is coming.
Eine Weiterbildung sieht vor, dass die Aufladevorrichtung als Aufladestab ausgebildet ist. Dieser Aufladestab kann zum einen relativ einfach an die Papierqualität angepasst werden, zum anderen kann der Abstand des Aufladestabes zur benachbarten Oberfläche der Papierbahn sehr exakt eingestellt werden. Außerdem ist ein Austausch des Aufladestabes z.B. zu Reparatur- und/oder Wartungszwecken problemlos möglich.A further development provides that the charging device as Charging bar is formed. This charging stick can be used for one relatively easy to adapt to the paper quality, on the other hand, the distance of the charging rod to adjacent surface of the paper web is set very precisely become. In addition, an exchange of the charging stick e.g. to Repair and / or maintenance purposes possible without any problems.
Gemäß einem bevorzugten Ausführungsbeispiel ist die Aufladevorrichtung im Bereich der in Transportrichtung gesehen letzten Gegendruckwalze einer Rotationsdruckmaschine vorgesehen. Dies hat den wesentlichen Vorteil, dass die Papierbahn von der Gegendruckwalze gehalten wird und sowohl für die Halterung als auch für den Transport des Bogens in diesem Bereich kein Greifer erforderlich ist, so dass die Aufladevorrichtung relativ nahe zum Papierbogen angeordnet werden kann. Die Aufladevorrichtung liegt der Gegendruckwalze unmittelbar gegenüber. Dies bedeutet, dass der Papierbogen zwischen der Gegendruckwalze und der Aufladevorrichtung sich befindet.According to a preferred embodiment, the Charging device in the area of the transport direction seen last impression roller of a rotary printing press intended. This has the main advantage that the Paper web is held by the platen roller and both for the holder as well as for the transport of the bow in this area no gripper is required, so the Charger arranged relatively close to the sheet of paper can be. The charging device lies on the counter-pressure roller directly opposite. This means that the paper sheet between the platen roller and the charger located.
Optimale Ergebnisse werden erzielt, wenn die Aufladevorrichtung unmittelbar vor der Ablösestelle des Bogens von der Gegendruckwälze vorgesehen ist. In diesem Fall wird der Bogen sofort nach der elektrostatischen Aufladung von der Gegendruckwalze abgehoben, so dass keine Ladung über die Gegendruckwalze abfließen kann. Optimal results are achieved if the Charging device immediately before the detachment point of the Arc is provided by the counter pressure roller. In this case the bow is immediately after the electrostatic charge lifted off the platen so that no cargo is over the back pressure roller can flow off.
Bei einem Ausführungsbeispiel ist vorgesehen, dass vor dem Aufladestab ein oder mehrere Ionisationsstäbe vorgesehen sind. Diese Ionisationsstäbe dienen zur Entladung bzw. Aufbereitung des Bogens vor der Aufladung mittels des Aufladestabes. Die Ionisationsstäbe werden mit Wechselspannung betrieben (etwa 6,5 kV) und dienen vorwiegend für eine aktive Entladung des Bogens bzw. der Bogenoberfläche. Der Aufladestab wird dagegen mit Gleichspannung betrieben (etwa 12 kV).In one embodiment, it is provided that before Charging bar one or more ionizing bars provided are. These ionizing bars are used for discharge or Preparation of the sheet before loading using the Charging bar. The ionizing bars are with AC operated (about 6.5 kV) and serve mainly for an active discharge of the bow or the Sheet surface. The charging stick, however, is with DC voltage operated (about 12 kV).
Vorzugsweise besteht die Gegendruckwalze aus einem elektrisch leitenden Material, z.B. aus Metall, und ist geerdet. Die Aufladevorrichtung, insbesondere der Aufladestab, ist positiv geladen bzw. sendet positive Ionen aus. Dieser Aufbau hat den wesentlichen Vorteil, dass die eine Seite des Papierbogens geerdet werden kann und auf der anderen Seite des Papierbogens die z.B. positiven Ionen aufgebracht werden und dass negativ geladener Puder verwendet werden kann.The counter-pressure roller preferably consists of an electric one conductive material, e.g. made of metal, and is grounded. The Charging device, especially the charging stick, is positive charges or sends out positive ions. This structure has the essential advantage that one side of the sheet of paper can be grounded and on the other side of the Sheet of paper e.g. positive ions are applied and that negatively charged powder can be used.
Mit Vorzug findet bei der Aufladung zwischen dem Bogen und der Gegendruckwalze bzw. der Masse keine Relativbewegung statt. Ein Abzug der negativen Ionen über die Masse kann somit ungehindert erfolgen. Außerdem wird die Aufladung nicht gestört, da der Bogen und die Masse in Ruhe zueinander sind.There is a preference for charging between the bow and the counter-pressure roller or the mass no relative movement instead of. A deduction of the negative ions over the mass can thus take place unhindered. In addition, the charging will not disturbed because the bow and the mass are at rest with each other.
Auf den elektrostatisch aufgeladenen Bogen wird dann entweder elektrostatisch z.B. negativ aufgeladener Puder oder ungeladener Puder aufgetragen. Dabei besitzt bei elektrostatisch aufgeladenem Puder der Puder die zur Ladung der bedruckten Fläche des Papierbogens entgegengesetzte Ladung.The electrostatically charged sheet is then either electrostatically e.g. negatively charged powder or applied unloaded powder. Has at electrostatically charged powder the powder to charge opposite to the printed area of the paper sheet Charge.
Vorteilhaft kann die Puderbestäubungsvorrichtung vor einem Bogenentroller angeordnet sein. Allgemein kann die Puderbestäubungsvorrichtung vor der Trocknungsstrecke angeordnet sein. Auf jeden Fall ist die Puderbestäubungsvorrichtung vor einer Bogenabbremseinrichtung vorgesehen, so dass beim Abbremsen des Bogens dieser bereits mit Puder bestäubt ist.The powder dusting device can be advantageous in front of a Bow roller can be arranged. In general, the Powder dusting device in front of the drying section be arranged. In any case, the powdering device provided in front of a sheet braking device, so that when braking the bow this already with powder is pollinated.
Ein weiterer Vorteil wird darin gesehen, dass der Bogen nach dem Ablösen von der Gegendruckwalze im Wesentlichen auf Luftpolstern geführt wird. Ein Abfließen von Ladung wird auf diese Weise verhindert oder zumindest verzögert.Another advantage is seen in the fact that the bow after detachment from the platen essentially Air cushion is guided. An outflow of charge is on this way prevented or at least delayed.
Die Aufladevorrichtung erzeugt ein der Breite des Bogens angepasstes elektrostatisches Feld, wobei das Feld an die Breite des Bogens anpassbar ist. Auf diese Weise können bei der Bearbeitung von schmalen Bogen Beschädigungen z.B. der Gegendruckwalze oder anderer Maschineneinrichtungen verhindert werden.The charger creates the width of the sheet adapted electrostatic field, the field to the Width of the arch is customizable. This way, at processing of narrow sheet damage e.g. the Back pressure roller or other machine equipment be prevented.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen sowie der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein besonders bevorzugtes Ausführungsbeispiel im Einzelnen dargestellt ist.Further advantages, features and details of the invention result from the subclaims and the following Description in which with reference to the drawing particularly preferred embodiment in detail is shown.
In der Zeichnung zeigen:
- Figur 1
- eine schematische Ansicht einer Bogenauslegeeinrichtung, welche an das Ende einer Rotationsdruckmaschine angekoppelt ist;
Figur 2- die übergabestation von der Rotationsdruckmaschine zur Bogenauslegeeinrichtung in vergrößerter Wiedergabe;
Figur 3- einen Ausschnitt der Gegendruckwalze mit Papierbogen bei der elektrostatischen Aufladung; und
- Figur 4
- die Gegendruckwalze und der Papierbogen nach der Aufladung.
- Figure 1
- a schematic view of a sheet delivery device which is coupled to the end of a rotary printing press;
- Figure 2
- the transfer station from the rotary printing press to the sheet delivery device in an enlarged representation;
- Figure 3
- a section of the impression roller with paper sheet in the electrostatic charge; and
- Figure 4
- the platen and the paper sheet after charging.
In der Figur 1 ist mit dem Bezugszeichen 1 eine
Bogenauslegeeinrichtung bezeichnet, die sich an die letzte
Gegendruckwalze 2 einer nicht dargestellten Druckmaschine,
z.B. einer Rotationsdruckmaschine anschließt. Zu dieser
Rotationsdruckmaschine gehört noch eine Gummiwalze 3, mit
welcher die Druckfarbe auf einen Papierbogen 4 (Figur 2),
welcher zwischen der Gegendruckwalze 2 und der Gummiwalze 3
hindurchgefördert wird, übertragen wird. Die
Bogenauslegeeinrichtung 1 dient dem Zweck, die von der
Druckmaschine herkommenden, bedruckten Papierbogen 4 zu einem
Stapel aufeinander zu schichten. Hierzu umfasst die
Bogenauslegeeinrichtung 1 in an sich bekannter Weise zwei im
gegenseitigen Abstand angeordnete, endlose Greiferketten 5,
die durch quer verlaufende Greiferwagen verbunden sind. Die
quer zur Zeichnungsebene der Figur 1 gemessene Länge dieser
Greiferwagen und damit der Abstand der beiden Greiferketten
5, von denen in der Figur 1 nur eine einzige dargestellt ist,
entspricht etwa der Breite der abzustapelnden Papierbogen 4.
Jeder Greiferwagen weist einen Greifer 6 auf, der den zu
transportierenden Papierbogen 4 am vorderen Rand festhält,
wie es in der Figur 2 dargestellt ist. Die Papierbogen 4
werden von den Greifern 6 so mitgeschleppt, dass die
bedruckte Bogenseite 7 (Figur 2) zum Greifer 6 zeigt, so dass
sie im Stapel nach oben gerichtet ist.In FIG. 1, reference numeral 1 is one
Sheet delivery device referred to the
Um die Trocknung des bedruckten Papierbogens 4 auf dem (nicht
dargestellten) Stapel zu begünstigen und um ein Schmieren der
noch feuchten Druckfarbe beim Aufeinanderschichten der Bogen
im Stapel zu verhindern, müssen die bedruckten Bogen 4 vor
ihrer Ablage mit Puder beschichtet werden. Hierfür weist die
Bogenauslegeeinrichtung 1 eine Puderbestäubungsvorrichtung 8
auf, die in Figur 1 lediglich schematisch dargestellt ist.
Mit dieser Puderbestäubungsvorrichtung 8 wird auf den
vorbeitransportierten Papierbogen 4 Puder aufgeblasen. Die
Puderbestäubungsvorrichtung 8 weist einen Abstand zum
Papierbogen 4 auf, der ein Vorbeilaufen des Greifers 6
ermöglicht. Dieser Abstand kann bis zu 15 cm betragen.To dry the printed paper sheet 4 on the (not
favor) stack and to lubricate the
still damp ink when layering the sheets
To prevent stacking, the printed sheets 4 must be in front
be coated with powder in their storage. For this, the
Sheet delivery device 1 a powder dusting device 8
on, which is shown only schematically in Figure 1.
With this powder dusting device 8 is on the
pasted sheets of paper inflated 4 powders. The
Powder dusting device 8 is at a distance from
Sheet of paper 4 on which the
In der Figur 2 ist die Gegendruckwalze 2 sowie eine
Umlenkrolle 9 für die Greiferkette 5 dargestellt. Der
Papierbogen 4 wird während des Druckvorganges mittels
Halteelementen 10 an der Gegendruckwalze 2 festgehalten, wobei
die Halteelemente 10 in die Gegendruckwalze 2 integriert
sind. In geringem Abstand zur bedruckten Bogenseite 7 des
Papierbogens 4 befindet sich eine Aufladevorrichtung 11, die
der Gegendruckwalze 2 gegenüberliegt. Außerdem befindet sich
die Aufladevorrichtung 11 unmittelbar vor der Ablösestelle
12, an der der Papierbogen 4 von der Gegendruckwalze 2
abgehoben und vom Greifer 6 in die Bogenauslegeeinrichtung 1
transportiert wird. Da keine Elemente über die
Zylinderoberfläche der Gegendruckwalze 2 überstehen, kann die
Aufladevorrichtung 11 mit sehr geringem Abstand zur
Oberfläche der Gegendruckwalze 2 bzw. zur bedruckten
Bogenseite 7 des Papierbogens 4 angeordnet sein.In Figure 2, the
Die Aufladevorrichtung 11 besteht bei dem in der Figur 2
dargestellten Ausführungsbeispiel aus einem Aufladestab 15
und zwei ionisationsstäben 18, die dem Aufladestab 15
vorgeschaltet sind, um den Bogen 4 zu entladen bw. für die
Aufladung vorzubereiten.The charging
Die Figur 3 zeigt einen Ausschnitt der Gegendruckwalze 2, auf
welcher der Papierbogen 4 aufliegt. Die Gegendruckwalze 2 ist
bei 13 geerdet. Außerdem besteht die Gegendruckwalze 2 aus
einem elektrisch leitenden Material, so dass die der
bedruckten Bogenseite 7 gegenüberliegende Bogenseite 14 mit
der Erdung 13 flächig verbunden ist. Außerdem ist in der
Figur 3 der Aufladestab 15 erkennbar. Dieser Aufladestab 15
gibt z.B. positiv geladene Ionen 16 in Richtung des
vorbeilaufenden Papierbogens 4 ab. Diese positiven Ionen 16
lagern sich auf der bedruckten Bogenseite 7 an, wobei sich
auf der unbedruckten Bogenseite 14 negative Ionen 17
ansammeln.FIG. 3 shows a section of the
Die Figur 4 zeigt den Papierbogen 4 unmittelbar nach der
Ablösestelle 12, d.h. nach der Trennung von der
Gegendruckwalze 5. Die beiden Bogenseiten 7 und 14 tragen die
positiven Ionen 16 bzw. die negativen Ionen 17. Dieser
Papierbogen 4 wird nun vom Greifer 6 in Richtung der
Puderbestäubungsvorrichtung 8 transportiert, wo dann der
Puder, der negativ geladen sein kann, aufgeblasen wird. Es
ist jedoch auch denkbar, ungeladenen Puder zu verwenden.Figure 4 shows the paper sheet 4 immediately after the
Als vorteil wird angesehen, dass der Papierbogen 4 bei der
elektrostatischen Aufladung vorzugsweise vollflächig an der
Gegendruckwalze 2 anliegt, die ihrerseits geerdet ist. Auf
diese Weise ist die ganze unbedruckte Bogenseite 14 während
der elektrostatischen Aufladung geerdet. Da die
Aufladevorrichtung 11 in unmittelbarer Nachbarschaft zur
bedruckten Bogenseite 7 angeordnet ist, kann eine optimale
Ausrichtung des elektrischen Feldes und eine exakte
Einstellung der Feldstärke gewährleistet werden. Da
unmittelbar nach der elektrostatischen Aufladung des
Papierbogens 4 dieser von der Gegendruckwalze 2 abgehoben
wird, wird die Ladung mitgenommen, bevor sie ausgeglichen
wird bzw. abfließt.It is considered an advantage that the paper sheet 4 at the
electrostatic charge preferably over the entire surface of the
Mit der erfindungsgemäßen Vorrichtung kann der Puder mit geringerem Verlust und gezielter auf den Papierbogen 4 aufgetragen werden.With the device according to the invention, the powder can less loss and more targeted to the paper sheet 4 be applied.
Claims (17)
- Device for powdering printed sheets (4) e.g. of paper by means of a power coating device (8), which is positioned inside a sheet delivery mechanism (1), whereby a charging device (11) is allocated to the sheet (4) to electrostatically charge it, characterized in that the charging device (11) is provided outside the sheet delivery mechanism (1) in a location before the sheet (4) enters the sheet delivery mechanism (1) and which is adjacent to the printed side of the sheet (4).
- Device in accordance with claim 1, characterized in that the charging device (1) is designed as a charging rod (15).
- Device in accordance with claim 2, characterized in that one or several ionization rods (18) are positioned ahead of the charging rod (15).
- Device in accordance with one of the preceding claims, characterized in that the charging device (11) is positioned in immediate proximity to the printed side of the sheet (4) .
- Device in accordance with one of the preceding claims, characterized in that the charging device (11) is located in the area of the last pressure roller (2) of a rotary offset press, viewed in the direction of transportation.
- Device in accordance with claim 5, characterized in that the charging device (11) is positioned opposite the pressure roller (2).
- Device in accordance with claim 5 or 6, characterized in that the charging device (11) is located immediately before the separation point (12) of the sheet (4) from the pressure roller (2).
- Device in accordance with one of the claims 5 through 7, characterized in that the pressure roller (2) is made of metal and is grounded, and the charging device (11), in particular a charging rod (15), is preferably positively charged or emits positive ions respectively.
- Device in accordance with one of the preceding claims, characterized in that the sheet (4) is grounded when it is electrostatically charged.
- Device in accordance with one of the claims 5 through 9, characterized in that there is no motion between the sheet (4) relative to ground when it is being electrostatically charged.
- Device in accordance with one of the preceding claims, characterized in that electrostatically charged or uncharged powder is applied to the sheet (4).
- Device in accordance with one of the preceding claims, characterized in that the powdering device (8) is positioned in front of a sheet unroller.
- Device in accordance with one of the preceding claims, characterized in that the powdering device (8) is positioned ahead of a drying section.
- Device in accordance with one of the preceding claims, characterized in that the powdering device (8) is intended to be ahead of a sheet braking device.
- Device in accordance with one of the preceding claims, characterized in that the sheet (4) is essentially being guided on air cushions after it is separated from the pressure roller.
- Device in accordance with one of the preceding claims, characterized in that the charging device (11) emits an electrostatic field adjusted to the width of the sheet (4).
- Device in accordance with claim 16, characterized in that the field is adjustable to the width of a sheet (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19836022A DE19836022A1 (en) | 1998-08-10 | 1998-08-10 | Device to dust printed sheets of paper etc. by powder dusting device which is located inside sheet delivery device has charging-up device outside paper delivery device at location |
| DE19836022 | 1998-08-10 | ||
| PCT/EP1999/004864 WO2000009337A1 (en) | 1998-08-10 | 1999-07-10 | Device for powdering printed sheets with the aid of an electrostatic charge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1105295A1 EP1105295A1 (en) | 2001-06-13 |
| EP1105295B1 true EP1105295B1 (en) | 2002-11-27 |
Family
ID=7876969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99934658A Expired - Lifetime EP1105295B1 (en) | 1998-08-10 | 1999-07-10 | Device for powdering printed sheets with the aid of an electrostatic charge |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6648972B1 (en) |
| EP (1) | EP1105295B1 (en) |
| JP (1) | JP2002522277A (en) |
| DE (2) | DE19836022A1 (en) |
| WO (1) | WO2000009337A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2003940A2 (en) | 2007-06-14 | 2008-12-17 | manroland AG | Printed functional components |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10020179A1 (en) | 2000-04-25 | 2001-11-08 | Daimler Chrysler Ag | Control unit for a paraglider system for manned paraglider flight and associated mission planning station |
| DE10038774A1 (en) * | 2000-06-09 | 2001-12-13 | Heidelberger Druckmasch Ag | Printer powder ink air transporter creates flow electrostatically allows local ink deposition |
| FI121039B (en) | 2002-03-14 | 2010-06-15 | Metso Paper Inc | Earth electrode and method in which it is used |
| FI118542B (en) * | 2002-03-14 | 2007-12-14 | Metso Paper Inc | Finishing process |
| DE10254424A1 (en) * | 2002-11-21 | 2004-06-03 | Lucas Automotive Gmbh | System for influencing the speed of a motor vehicle |
| DE102005032801B4 (en) * | 2005-07-14 | 2010-07-01 | Manroland Ag | Method and device for powdering printing substrates |
| CN101045365A (en) * | 2006-03-28 | 2007-10-03 | 海德堡印刷机械股份公司 | Device for applicating powder onto sheets |
| DE102009026569A1 (en) | 2009-03-19 | 2010-09-23 | Koenig & Bauer Aktiengesellschaft | Surface processing device for use in sheet-fed offset rotary printing press, has sheet smoothing part extending transverse to sheet conveying direction, and powder nozzles attached to sheet smoothing part for applying powder on sheet |
| WO2011030644A1 (en) * | 2009-09-14 | 2011-03-17 | 株式会社コスモテック | Powder-dispersing device for printing |
| DE202009016037U1 (en) | 2009-11-24 | 2010-02-25 | Manroland Ag | Device for powdering printing substrates |
| DE102012103342A1 (en) | 2012-04-17 | 2013-10-17 | Océ Printing Systems GmbH & Co. KG | Method for operating digital printer, involves applying electrical charge having same polarity as polarity of electrical charge of toner particles of liquid developer to outer surface of back pressure roll of printing element |
| DE102019118566B4 (en) | 2019-07-09 | 2022-07-14 | Koenig & Bauer Ag | Sheet processing machine and method for conveying sheets |
| DE102019118569B4 (en) * | 2019-07-09 | 2022-05-12 | Koenig & Bauer Ag | Sheet processing machine and method for conveying sheets |
| DE102019118565B4 (en) | 2019-07-09 | 2022-07-21 | Koenig & Bauer Ag | Sheet processing machine and method for conveying sheets |
| DE102019118571B4 (en) * | 2019-07-09 | 2022-05-25 | Koenig & Bauer Ag | Sheet processing machine and method for conveying sheets |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3053180A (en) * | 1960-03-17 | 1962-09-11 | Donald J Doyle | Anti-offset powder spray and cleaner system |
| DE2151185B2 (en) * | 1971-10-14 | 1979-07-19 | Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg | Device for applying powder to an impression cylinder |
| US4048038A (en) * | 1974-07-08 | 1977-09-13 | J. M. Huber Corporation | Electroflocculation cell |
| DE2936754A1 (en) * | 1979-09-12 | 1981-04-02 | Weitmann & Konrad GmbH & Co KG, 7023 Echterdingen | DEVICE FOR ELECTROSTATICALLY APPLYING MATERIAL PARTICLES CONTAINED IN A GAS FLOW TO A PROVIDING, FLAT-BASED BASE |
| DE3135220A1 (en) * | 1981-09-05 | 1983-03-17 | Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen | DEVICE FOR APPLYING POWDER PARTICLES |
| DE3217779A1 (en) * | 1982-05-12 | 1983-11-17 | Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen | Device for controlling the powder dispenser in a printing machine |
| DE3229035C1 (en) * | 1982-08-04 | 1984-01-05 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Web offset rotary printing machine with a device for applying powder |
| JPS6032032U (en) * | 1983-08-09 | 1985-03-05 | 三菱重工業株式会社 | Powder coating device in the paper discharge section of the printing machine |
| JPS6463144A (en) * | 1987-09-03 | 1989-03-09 | Komori Printing Mach | Paper discharge device in sheet-fed printer |
| JPH0465088A (en) * | 1990-07-03 | 1992-03-02 | Fuji Photo Film Co Ltd | Web electrifying device |
| EP0652104B1 (en) * | 1993-11-05 | 2002-04-10 | MAN Roland Druckmaschinen AG | Printing unit for waterless offset printing |
| DE4427904A1 (en) * | 1994-08-06 | 1996-02-08 | Hans Platsch | Powder sprayer |
| DE29623325U1 (en) | 1996-03-11 | 1998-03-05 | Platsch, Hans Georg, 70565 Stuttgart | Device for dusting printed products |
| DE19609438B4 (en) * | 1996-03-11 | 2007-10-11 | Platsch, Hans Georg | Device for dusting printed products |
| US5763131A (en) * | 1996-08-02 | 1998-06-09 | Delphax Systems | Liquid toner and imaging system |
| DE19636658C2 (en) * | 1996-09-10 | 2000-12-14 | Roland Man Druckmasch | Device for the surface treatment of sheet-shaped substrates |
-
1998
- 1998-08-10 DE DE19836022A patent/DE19836022A1/en not_active Ceased
-
1999
- 1999-07-10 JP JP2000564816A patent/JP2002522277A/en active Pending
- 1999-07-10 WO PCT/EP1999/004864 patent/WO2000009337A1/en not_active Application Discontinuation
- 1999-07-10 DE DE59903568T patent/DE59903568D1/en not_active Expired - Lifetime
- 1999-07-10 EP EP99934658A patent/EP1105295B1/en not_active Expired - Lifetime
- 1999-07-10 US US09/762,723 patent/US6648972B1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2003940A2 (en) | 2007-06-14 | 2008-12-17 | manroland AG | Printed functional components |
| EP2003941A2 (en) | 2007-06-14 | 2008-12-17 | manroland AG | Printed functional components |
| DE102007027473A1 (en) | 2007-06-14 | 2008-12-18 | Manroland Ag | Technically produced functional components |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59903568D1 (en) | 2003-01-09 |
| WO2000009337A1 (en) | 2000-02-24 |
| JP2002522277A (en) | 2002-07-23 |
| DE19836022A1 (en) | 2000-02-17 |
| EP1105295A1 (en) | 2001-06-13 |
| US6648972B1 (en) | 2003-11-18 |
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