EP0925190B1 - Device and method for dusting smooth or sheet-like products - Google Patents
Device and method for dusting smooth or sheet-like products Download PDFInfo
- Publication number
- EP0925190B1 EP0925190B1 EP97937575A EP97937575A EP0925190B1 EP 0925190 B1 EP0925190 B1 EP 0925190B1 EP 97937575 A EP97937575 A EP 97937575A EP 97937575 A EP97937575 A EP 97937575A EP 0925190 B1 EP0925190 B1 EP 0925190B1
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- EP
- European Patent Office
- Prior art keywords
- powder
- accordance
- product
- sheet
- particles
- 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/001—Electric or magnetic imagery, e.g., xerography, electrography, magnetography, etc. Process, composition, or product
- Y10S430/102—Electrically charging radiation-conductive surface
Definitions
- the invention relates to a device for dusting web or leaf-shaped products according to the preamble of Claim 1, and a method for dusting such Products.
- the very fine-grained powder the is applied to the sheets of paper with an air stream, only a small part of it is deposited on the paper sheet becomes. Because of the very high transport speeds of sheets of paper - approx. 15,000 sheets per hour strong air turbulence, so that a large part of the Puders not reached the paper sheet, but to Contamination of the printing press or the ambient air contributes.
- the powder particles recharge and in a loaded state on the paper sheet applied.
- Another device is from DE-OS 29 36 754 known with which on the paper sheet powder to be deposited essentially electrically neutral Dispensed nozzles and before hitting the paper sheet is charged by a corona discharge. Disadvantageous this method is that the powder loaded is better adheres to the sheets of paper, but also to all especially metallic neutral machine parts better adheres. The machine parts are with after a short time a thick layer of powder.
- DE-OS 33 30 665 was another Device proposed in which the powder at the exit is neutralized electrically from the nozzle. This is the electrostatic adhesion of powder metallic machine parts avoided, but then they occur again the original problems on that the very fine-grained powder due to the large air turbulence Areas of the printing press and the environment are dirty.
- the known devices therefore offer only insufficient ones Solutions to the pollination problem by using only a minor Part of the powder ultimately deposited on the paper sheet is and a contamination of the printing press or Environment is hardly avoided.
- the individual powder particles of Powders are magnetizable.
- Means are also provided to generate a magnetic field in the storage area of the powder can, so that on the magnetized powder particles Force acts on the paper sheet. This can the powder is better separated from the air.
- the magnetic forces are greater than the electrostatic Forces from known pollinators. Through the known electrostatic forces is only the Powder already deposited on the paper sheet is better held. With the device according to the invention and the however, the corresponding procedure is not yet deposited powder effectively by means of magnetic forces can be influenced and better separated from the air.
- the flow rate of the powder / air mixture can be increased, making the powder-carrying airflow less is sensitive to interference and thus less pollution surrounding machine parts occurs.
- the amount of powder used be reduced.
- Electromagnets are used, with electromagnets too are preferred because these, for example to clean the Printing machine, can be switched off and thus adheres to powder are easier to clean.
- the magnet is advantageously arranged so that the Product between at least one pole and the spray nozzle can be passed so that the paper sheet to be pollinated can be transported directly via a pole of the magnet is so that in the storage area of the powder as possible strong magnetic field prevails.
- An embodiment of the invention according to claim 6 allows the adaptation of the magnetic field to different ones Paper widths by turning on only the magnets covered by the sheet of paper to be pollinated.
- a pole of the or is preferred Magnets arranged in the storage area of the powder, because in the Pole area the greatest magnetic field strength prevails.
- the other Pol is preferably downstream in the transport direction arranged so that powder not deposited there yet once experienced a force towards the paper sheet. This increases the efficiency of the deposit.
- the sheets of paper are transported to the Spray nozzle transported past. So that means of transport do not disturb the magnetic field, they preferably exist made of non-magnetizable material, for example Plastic, with a gripping element with which the bow is attached its leading edge is gripped for transport magnetizable material. This creates at the Leading edge of the sheet strong magnetic fields, so that the Deposition of the powder in this by known Devices not adequately dustable with powder Area is enhanced by the magnetic force.
- the magnetizable powder can be coated or coated iron particles or powder particles that are on have coated iron particles on their surface, consist. Iron is ferromagnetic and therefore special highly magnetizable. The iron particles should be covered or coated so that the iron cannot oxidize and no unwanted stains on the paper sheet leaves.
- An invention shown in the drawing Device 10 has a transverse to a transport direction 12 arranged spray bar 14, the spray nozzles 16th with which a by dashed lines 18th powder / air mixture shown on the material to be dusted Product, in the illustrated embodiment Paper sheet 20 is sprayable across its width.
- the Paper sheet 20 is used for pollination along its length suitable means of transport 38 on the spray nozzles 16 in Transport direction 12 passed.
- the powder consists of individual, magnetizable Powder particles, which are preferably encased or coated iron particles exist.
- the powder particles consist of known Materials such as starch or calcium carbonate and have coated iron particles on their surface.
- the device 10 comprises means 22 with which Storage area 24 of the powder, that is, on the surface of the Sheet of paper 20, one by dotted lines 23 shown magnetic field can be generated.
- Storage area 24 of the powder that is, on the surface of the Sheet of paper 20
- one by dotted lines 23 shown magnetic field can be generated.
- the Magnetic field 23 become those entering the magnetic field Powder particles magnetized.
- the magnetic field is like this trained that a magnetic force towards the Paper sheet 20 attacks the powder particles.
- the means 22 can have at least one permanent magnet include.
- the means comprise an electromagnet 26 (FIG. 1) which is arranged so that the paper sheet between at least a pole 28 and the spray nozzles 16 can be passed.
- Both poles 28 and 30 of the electromagnet 26 are preferred below a 'leading the paper sheet 20' Sheet guide plate 32 arranged ( Figure 1). This is the Paper sheet 20 securely guided and contamination of the Electromagnets 26 avoided.
- the electromagnet 26 is formed from a U-profile, whose U-legs form the poles 28 and 30 and the across the transport direction 12 across the product width extends.
- the poles 28 and 30 thus extend over the entire sheet width 20.
- a current-carrying Coil 31 generates the magnetic field in the iron core of the magnet 26th
- Exemplary embodiments are transverse to the transport direction 12 parallel and in a row a variety of Electromagnet 34 arranged, the coils 36 in each are flowed through in the same direction, so that transverse 12 poles of the same name are adjacent to the transport direction. Depending on the width of the paper sheet, individual ones can then Electromagnets are switched off, so that a Contamination of the printing press outside of the Sheet width is avoided.
- the magnet or magnets as in FIG. 5 is preferred shown arranged.
- One pole 28 is located here immediately in the storage area 24 of the powder and the other Pole 30 downstream in the direction of transport 12.
- the device according to the invention means of transport 38, have the gripping elements 40 with which the paper sheet 20 is gripped for transport on its front edge 42.
- the magnetic field 23 is not due to the massive Transport 38 is disturbed, it does not consist of magnetizable material, for example plastic. It is advantageous if the gripping element 40 magnetizable material, because then the Driving over the means of transport 38 via the magnet 26 by magnetizing the gripper element 40 thereof free edge 44 formed as a magnetic pole. Thereby is in the area of the front edge 42 of the paper sheet 20th increasingly powder deposited.
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum Bestäuben bahnoder
blattförmiger Produkte gemäß dem Oberbegriff des
Anspruchs 1, sowie ein Verfahren zum Bestäuben derartiger
Produkte.The invention relates to a device for dusting web or
leaf-shaped products according to the preamble of
Derartige Vorrichtungen und Verfahren zum Bestäuben werden in Stapelvorrichtungen für beispielsweise bedruckte Papierbögen in einer Bogenoffset-Druckmaschine eingesetzt, damit mittels eines Puders die einzelnen Papierbögen zum Trocknen der Druckfarbe voneinander beabstandet sind. Dabei tritt das Problem auf, daß der sehr feinkörnige Puder, der mit einem Luftstrom auf die Papierbögen aufgebracht wird, nur zu einem geringen Teil auf dem Papierbogen abgelegt wird. Aufgrund der sehr hohen Transportgeschwindigkeiten der Papierbögen - ca. 15 000 Bögen pro Stunde - treten starke Luftverwirbelungen auf, so daß ein großer Teil des Puders nicht den Papierbogen erreicht, sondern zur Verschmutzung der Druckmaschine bzw. der Umgebungsluft beiträgt.Such devices and methods for pollination in stacking devices for, for example, printed Sheets of paper used in a sheetfed offset press, so that the individual sheets of paper can be Drying the ink are spaced apart. there the problem arises that the very fine-grained powder, the is applied to the sheets of paper with an air stream, only a small part of it is deposited on the paper sheet becomes. Because of the very high transport speeds of sheets of paper - approx. 15,000 sheets per hour strong air turbulence, so that a large part of the Puders not reached the paper sheet, but to Contamination of the printing press or the ambient air contributes.
Zur Verbesserung des Wirkungsgrades der Bestäubung wurde gemäß der DE-OS 26 46 798 vorgeschlagen, die Puderteilchen aufzuladen und in geladenem Zustand auf den Papierbogen aufzubringen. Eine weitere Vorrichtung ist aus der DE-OS 29 36 754 bekannt, mit der der auf dem Papierbogen abzulagernde Puder im wesentlichen elektrisch neutral aus Düsen abgegeben und vor dem Auftreffen auf dem Papierbogen durch eine Korona-Entladung aufgeladen wird. Nachteilig an diesen Verfahren ist, daß der geladene Puder zwar besser auf den Papierbögen haftet, aber ebenso an sämtlichen, insbesondere metallisch neutralen Maschinenteilen besser anhaftet. Die Maschinenteile sind nach kurzer Zeit mit einer dicken Schicht Puder beladen.To improve the efficiency of pollination proposed according to DE-OS 26 46 798, the powder particles recharge and in a loaded state on the paper sheet applied. Another device is from DE-OS 29 36 754 known with which on the paper sheet powder to be deposited essentially electrically neutral Dispensed nozzles and before hitting the paper sheet is charged by a corona discharge. Disadvantageous this method is that the powder loaded is better adheres to the sheets of paper, but also to all especially metallic neutral machine parts better adheres. The machine parts are with after a short time a thick layer of powder.
Aus diesem Grunde wurde in der DE-OS 33 30 665 eine weitere Vorrichtung vorgeschlagen, bei der der Puder beim Austritt aus der Düse elektrisch neutralisiert wird. Dadurch ist zwar das elektrostatische Anhaften von Puder auf metallischen Maschinenteilen vermieden, aber es treten dann wieder die ursprünglichen Probleme auf, daß der sehr feinkörnige Puder durch die Luftverwirbelungen große Bereiche der Druckmaschine und der Umgebung verschmutzt.For this reason, DE-OS 33 30 665 was another Device proposed in which the powder at the exit is neutralized electrically from the nozzle. This is the electrostatic adhesion of powder metallic machine parts avoided, but then they occur again the original problems on that the very fine-grained powder due to the large air turbulence Areas of the printing press and the environment are dirty.
Die bekannten Vorrichtungen bieten daher nur unzureichende Lösungen des Bestäubungsproblems, indem nur ein geringer Teil des Puders letztendlich auf dem Papierbogen abgelagert wird und eine Verschmutzung der Druckmaschine bzw. der Umgebung kaum vermieden wird.The known devices therefore offer only insufficient ones Solutions to the pollination problem by using only a minor Part of the powder ultimately deposited on the paper sheet is and a contamination of the printing press or Environment is hardly avoided.
Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine verbesserte Vorrichtung und Verfahren zum Bestäuben bewegter Gegenstände bereitzustellen, mit der der Puder effektiv auf den Papierbögen abgelegt werden kann, wobei eine Verschmutzung der Druckmaschine und der Umgebung reduziert ist.Based on this state of the art, it is the task of Invention, an improved device and method for Provide dusting of moving objects with which the Powder can be effectively deposited on sheets of paper causing pollution of the printing press and the environment is reduced.
Diese Aufgabe wird gelöst durch eine Vorrichtung mit den
Merkmalen des Anspruchs 1 sowie ein Verfahren mit den
Merkmalen des Anspruchs 11.This object is achieved by a device with the
Features of
Mit der erfindungsgemäßen Vorrichtung ist in bekannter Weise ein Puder/Luftgemisch auf den Papierbogen sprühbar, wobei erfindungsgemäß die einzelnen Puderteilchen des Puders magnetisierbar sind. Weiter sind Mittel vorgesehen, um im Ablagebereich des Puders ein Magnetfeld erzeugen zu können, so daß auf das magnetisierte Puderteilchen eine Kraft in Richtung auf den Papierbogen wirkt. Dadurch kann der Puder von der Tragluft besser getrennt werden. Die magnetischen Kräfte sind größer als die elektrostatischen Kräfte von bekannten Bestäubungsvorrichtungen. Durch die bekannten elektrostatischen Kräfte wird lediglich der bereits abgelagerte Puder auf dem Papierbogen besser gehalten. Mit der erfindungsgemäßen Vorrichtung und dem entsprechenden Verfahren ist jedoch bereits noch nicht abgelagerter Puder mittels der magnetischen Kräfte effektiv beeinflußbar und besser von der Tragluft trennbar.With the device according to the invention is known in Spray a powder / air mixture onto the paper sheet, according to the invention the individual powder particles of Powders are magnetizable. Means are also provided to generate a magnetic field in the storage area of the powder can, so that on the magnetized powder particles Force acts on the paper sheet. This can the powder is better separated from the air. The magnetic forces are greater than the electrostatic Forces from known pollinators. Through the known electrostatic forces is only the Powder already deposited on the paper sheet is better held. With the device according to the invention and the however, the corresponding procedure is not yet deposited powder effectively by means of magnetic forces can be influenced and better separated from the air.
Die Strömungsgeschwindigkeit des Puder/Luftgemisches kann erhöht werden, wodurch der pudertragende Luftstrom weniger störempfindlich ist und somit weniger Verschmutzung der umgebenden Maschinenteile auftritt.The flow rate of the powder / air mixture can can be increased, making the powder-carrying airflow less is sensitive to interference and thus less pollution surrounding machine parts occurs.
Da die Puderteilchen aufgrund der magnetischen Kraft besser von der Tragluft getrennt werden können und dadurch eine effektivere Ablagerung des Puders auf dem Papierbogen gewährleistet ist, kann die eingesetzte Pudermenge reduziert werden.Because the powder particles better due to the magnetic force can be separated from the air and thereby a more effective deposition of the powder on the paper sheet is guaranteed, the amount of powder used be reduced.
Vorteilhafte Ausgestaltungen der erfindungsgemäßen Vorrichtung sind Gegenstand der abhängigen Ansprüche 2 bis 10.Advantageous embodiments of the invention Device are the subject of dependent claims 2 to 10th
Zur Erzeugung des Magnetfeldes können Permanent- oder Elektromagnete eingesetzt werden, wobei Elektromagnete zu bevorzugen sind, da diese, beispielsweise zum Säubern der Druckmaschine, abschaltbar und somit von anhaftendem Puder besser reinigbar sind. To generate the magnetic field, permanent or Electromagnets are used, with electromagnets too are preferred because these, for example to clean the Printing machine, can be switched off and thus adheres to powder are easier to clean.
Vorteilhafterweise ist der Magnet so angeordnet, daß das Produkt zwischen wenigstens einem Pol und der Sprühdüse hindurchführbar ist, so daß der zu bestäubende Papierbogen unmittelbar über einen Pol des Magneten transportierbar ist, so daß im Ablagebereich des Puders ein möglichst starkes Magnetfeld herrscht.The magnet is advantageously arranged so that the Product between at least one pole and the spray nozzle can be passed so that the paper sheet to be pollinated can be transported directly via a pole of the magnet is so that in the storage area of the powder as possible strong magnetic field prevails.
In der Ausgestaltung der Erfindung gemäß Anspruch 5 ist gewährleistet, daß über die gesamte Papierbogenbreite eine gleichmäßige Magnetkraft auf den Puder wirkt.In the embodiment of the invention according to claim 5 ensures that a uniform magnetic force acts on the powder.
Eine Ausgestaltung der Erfindung gemäß Anspruch 6 erlaubt die Anpassung des Magnetfeldes an verschiedene Papierbreiten, indem nur die Magnete eingeschaltet werden, die durch den zu bestäubenden Papierbogen abgedeckt sind.An embodiment of the invention according to claim 6 allows the adaptation of the magnetic field to different ones Paper widths by turning on only the magnets covered by the sheet of paper to be pollinated.
Bevorzugt ist gemäß Anspruch 7 ein Pol des oder der Magneten im Ablagebereich des Puders angeordnet, da im Polbereich die größte Magnetfeldstärke herrscht. Der andere Pol ist bevorzugt in Transportrichtung stromabwärts angeordnet, so daß nicht abgelagerter Puder dort noch einmal eine Kraft in Richtung auf den Papierbogen erfährt. Die Effizienz der Ablagerung ist dadurch erhöht.According to claim 7, a pole of the or is preferred Magnets arranged in the storage area of the powder, because in the Pole area the greatest magnetic field strength prevails. The other Pol is preferably downstream in the transport direction arranged so that powder not deposited there yet once experienced a force towards the paper sheet. This increases the efficiency of the deposit.
Die Papierbögen werden mittels Transportmitteln an der Sprühdüse vorbeitransportiert. Damit die Transportmittel das Magnetfeld nicht stören, bestehen diese vorzugsweise aus nicht magnetisierbarem Material, beispielsweise Kunststoff, wobei ein Greifelement, mit dem der Bogen an seiner Vorderkante zum Transport ergriffen ist, aus magnetisierbarem Material besteht. Dadurch entstehen an der Vorderkante des Bogens starke Magnetfelder, so daß die Ablagerung des Puders in diesem durch bekannte Vorrichtungen nur unzureichend mit Puder bestäubbaren Bereich verstärkt durch die Magnetkraft unterstützt ist.The sheets of paper are transported to the Spray nozzle transported past. So that means of transport do not disturb the magnetic field, they preferably exist made of non-magnetizable material, for example Plastic, with a gripping element with which the bow is attached its leading edge is gripped for transport magnetizable material. This creates at the Leading edge of the sheet strong magnetic fields, so that the Deposition of the powder in this by known Devices not adequately dustable with powder Area is enhanced by the magnetic force.
Der magnetisierbare Puder kann aus umhüllten oder beschichteten Eisenteilchen oder aus Puderteilchen, die auf ihrer Oberfläche umhüllte Eisenteilchen aufweisen, bestehen. Eisen ist ferromagnetisch und deshalb besonders stark magnetisierbar. Die Eisenteilchen sollten umhüllt oder beschichtet sein, damit das Eisen nicht oxidieren kann und keine unerwünschten Flecken auf dem Papierbogen hinterläßt.The magnetizable powder can be coated or coated iron particles or powder particles that are on have coated iron particles on their surface, consist. Iron is ferromagnetic and therefore special highly magnetizable. The iron particles should be covered or coated so that the iron cannot oxidize and no unwanted stains on the paper sheet leaves.
Ein Verfahren, bei dem die erfindungsgemäße Vorrichtung zum Einsatz kommt, ist Gegenstand des Anspruchs 11.A method in which the inventive device for Use is the subject of claim 11.
Im folgenden wird die Erfindung anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung im einzelnen erläutert. In der Zeichnung zeigen:
Figur 1- eine stark schematisierte Darstel-lung einer erfindungsgemäßen Vor-richtung in der Seitenansicht,
- Figur 2
- eine Ansicht entlang der Linie II-II aus
Figur 1, - Fig. 3 und 4
- Darstellungen wie
Figur 1 und 2 einer weiteren Ausführungsform der Erfindung, - Figur 5
- eine Ansicht wie
Figur 1 einer weiteren Ausführungsform, - Figur 6
- eine Ausführungsform der Erfindung mit Transportmitteln für einen Papierbogen.
- Figure 1
- a highly schematic representation of a device according to the invention in side view,
- Figure 2
- 2 shows a view along the line II-II from FIG. 1,
- 3 and 4
- Representations like FIGS. 1 and 2 of a further embodiment of the invention,
- Figure 5
- 2 shows a view like FIG. 1 of a further embodiment,
- Figure 6
- an embodiment of the invention with transport means for a sheet of paper.
Eine in der Zeichnung dargestellte erfindungsgemäße
Vorrichtung 10 weist eine quer zu einer Transportrichtung
12 angeordnete Sprühstange 14 auf, die Sprühdüsen 16
aufweist, mit denen ein durch gestrichelte Linien 18
dargestelltes Puder/Luftgemisch auf das zu bestäubende
Produkt, in dem dargestellten Ausführungsbeispiel ein
Papierbogen 20, über seine Breite besprühbar ist. Der
Papierbogen 20 wird zur Bestäubung über seine Länge mittels
geeigneter Transportmittel 38 an den Sprühdüsen 16 in
Transportrichtung 12 vorbeigezogen.An invention shown in the
Der Puder besteht aus einzelnen, magnetisierbaren Puderteilchen, die vorzugsweise aus umhüllten oder beschichteten Eisenteilchen bestehen. In einer alternativen Ausführungsform bestehen die Puderteilchen aus bekannten Materialien, beispielsweise Stärke oder Calciumcarbonat und weisen auf ihrer Oberfläche umhüllte Eisenteilchen auf.The powder consists of individual, magnetizable Powder particles, which are preferably encased or coated iron particles exist. In an alternative Embodiment, the powder particles consist of known Materials such as starch or calcium carbonate and have coated iron particles on their surface.
Weiter umfaßt die Vorrichtung 10 Mittel 22, mit denen im
Ablagebereich 24 des Puders, also an der Oberfläche des
Papierbogens 20, ein durch punktierte Linien 23
dargestelltes Magnetfeld erzeugbar ist. Durch das
Magnetfeld 23 werden die in das Magnetfeld eintretenden
Puderteilchen magnetisiert. Das Magnetfeld ist derart
ausgebildet, daß eine magnetische Kraft in Richtung auf den
Papierbogen 20 an den Puderteilchen angreift.Furthermore, the
Die Mittel 22 können wenigstens einen Permanentmagneten
umfassen. In einer ersten Ausführungsform der Erfindung
umfassen die Mittel einen Elektromagneten 26 (Figur 1), der
so angeordnet ist, daß der Papierbogen zwischen wenigstens
einem Pol 28 und den Sprühdüsen 16 hindurchführbar ist.The means 22 can have at least one permanent magnet
include. In a first embodiment of the invention
the means comprise an electromagnet 26 (FIG. 1) which
is arranged so that the paper sheet between at least
a
Bevorzugt sind beide Pole 28 und 30 des Elektromagneten 26
unterhalb eines den Papierbogen 20 führenden'
Bogenleitbleches 32 angeordnet (Figur 1). Dadurch ist der
Papierbogen 20 sicher geführt und eine Verschmutzung des
Elektromagneten 26 vermieden.Both
In dem in Figur 1 und 2 dargestellten Ausführungsbeispiel
ist der Elektromagnet 26 gebildet aus einem U-Profil,
dessen U-Schenkel die Pole 28 und 30 bilden und der sich
quer zur Transportrichtung 12 über die Produktbreite
erstreckt. Die Pole 28 und 30 erstrecken sich somit über
die gesamte Papierbogenbreite 20. Eine stromdurchflossene
Spule 31 erzeugt das Magnetfeld im Eisenkern des Magneten
26.In the embodiment shown in Figures 1 and 2
the
In dem weiteren, in Figur 3 und 4 dargestellten
Ausführungsbeispiel sind quer zur Transportrichtung 12
parallel und in einer Reihe eine Vielzahl von
Elektromagneten 34 angeordnet, deren Spulen 36 jeweils in
gleicher Richtung von Strom durchflossen sind, so daß quer
zur Transportrichtung 12 gleichnamige Pole benachbart sind.
Entsprechend der Papierbogenbreite können dann einzelne
Elektromagneten abgeschaltet werden, so daß eine
Verschmutzung der Druckmaschine außerhalb der
Papierbogenbreite vermieden ist.In the further, shown in Figures 3 and 4
Exemplary embodiments are transverse to the
Bevorzugt ist bzw. sind der bzw. die Magnete wie in Figur 5
dargestellt angeordnet. Dabei befindet sich der eine Pol 28
unmittelbar im Ablagebereich 24 des Puders und der andere
Pol 30 in Transportrichtung 12 stromabwärts.The magnet or magnets as in FIG. 5 is preferred
shown arranged. One
In dem in Figur 6 dargestellten Ausführungsbeispiel weist
die erfindungsgemäße Vorrichtung Transportmittel 38 auf,
die Greifelemente 40 aufweisen, mit denen der Papierbogen
20 zum Transport an seiner Vorderkante 42 ergriffen ist. In the embodiment shown in Figure 6 points
the device according to the invention means of
Damit das Magnetfeld 23 nicht durch das massive
Transportmittel 38 gestört wird, besteht dieses aus nicht
magnetisierbarem Material, beispielsweise Kunststoff. Es
ist vorteilhaft, wenn das Greifelement 40 aus
magnetisierbarem Material besteht, denn dann wird beim
Überfahren des Transportmittels 38 über den Magneten 26
durch die Magnetisierung des Greiferelements 40 dessen
freie Kante 44 als magnetischer Pol ausgebildet. Dadurch
wird im Bereich der Vorderkante 42 des Papierbogens 20
vermehrt Puder abgelagert.So that the
Claims (11)
- A device for dusting web- or sheet-shaped products (20), having at least one spray nozzle (16), by means of which a powder/air mixture (18) can be sprayed on the product (20), characterized in that individual powder particles of the powder can be magnetized, and that means (22) are provided for generating a magnetic field (23) in the deposition area (24) of the powder, so that a force in the direction toward the product (20) is exerted on the magnetized powder particle.
- The device in accordance with claim 1, characterized in that the means include at least one permanent magnet.
- The device in accordance with claim 1 or 2, characterized in that the means (22) include at least one electromagnet (26).
- The device in accordance with claim 2 or 3, characterized in that the magnet (26) is arranged in such a way that the product (20) can be passed between at least one pole (28 or 30) and the spray nozzle (16).
- The device in accordance with one of the preceding claims, characterized in that the means (22) include a magnet (26) with a U-profile, whose U-legs form the poles (28 and 30), which extend transversely to the conveying direction (12) over the width of the product.
- The device in accordance with one of the preceding claims 1 to 4, characterized in that the means (22) include a plurality of electromagnets (34), which are arranged parallel and transversely to the conveying direction (12) next to each other.
- The device in accordance with one of the preceding claims 4 to 6, characterized in that one pole (28) of the magnet(s) (26, 34) is arranged in the deposition area (24) of the powder, and the other pole (30) downstream in the conveying direction (12).
- The device in accordance with one of the preceding claims 4 to 7, characterized in that conveying means (38) for conveying the sheet-shaped products (20) are made of a non-magnetizable material, such as plastic, and have a gripper element (40), with which the product (20) is grasped at its front edge, and which is made of a magnetizable material.
- The device in accordance with one of the preceding claims, characterized in that the magnetizable powder is made of covered or coated iron particles.
- The device in accordance with one of the preceding claims 1 to 8, characterized in that the magnetizable powder is made of powder particles having covered iron particles on their surface.
- A method for dusting web- or sheet-shaped products (20), wherein the product (20) is sprayed with a powder/air mixture (18), characterized in that the powder particles are magnetized prior to impacting the product (20), and are deposited on the product (20) by means of a magnetic force acting on the magnetized powder particles.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19635830A DE19635830A1 (en) | 1996-09-04 | 1996-09-04 | Device and method for dusting web or sheet products |
| DE19635830 | 1996-09-04 | ||
| PCT/EP1997/004394 WO1998009818A1 (en) | 1996-09-04 | 1997-08-13 | Device and method for dusting smooth or sheet-like products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0925190A1 EP0925190A1 (en) | 1999-06-30 |
| EP0925190B1 true EP0925190B1 (en) | 2002-09-04 |
Family
ID=7804572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97937575A Expired - Lifetime EP0925190B1 (en) | 1996-09-04 | 1997-08-13 | Device and method for dusting smooth or sheet-like products |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6447855B1 (en) |
| EP (1) | EP0925190B1 (en) |
| JP (1) | JP2000517259A (en) |
| AT (1) | ATE223311T1 (en) |
| DE (2) | DE19635830A1 (en) |
| WO (1) | WO1998009818A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0847856A3 (en) * | 1996-12-10 | 1998-12-30 | Heidelberger Druckmaschinen Aktiengesellschaft | Powdering device for sheets |
| US20050045055A1 (en) * | 2003-08-28 | 2005-03-03 | Daniel Gelbart | Security printing method |
| DE102004057478B4 (en) * | 2004-11-19 | 2009-07-09 | Weitmann & Konrad Gmbh & Co. Kg | Aerosol can and method for dusting of fresh printed products |
| DE102005032801B4 (en) * | 2005-07-14 | 2010-07-01 | Manroland Ag | Method and device for powdering printing substrates |
| US20070218300A1 (en) * | 2006-03-14 | 2007-09-20 | Helmick David A | Method of applying a coating to an article via magnetic pulse welding |
| DE202009016037U1 (en) | 2009-11-24 | 2010-02-25 | Manroland Ag | Device for powdering printing substrates |
| DE102012206168A1 (en) | 2012-04-16 | 2013-10-17 | Weitmann & Konrad Gmbh & Co Kg | Device for distributed application of powder on moving printed products, has multiple nozzles, where flow volume flowing from nozzle front is similar to or greater than sum of outflowing conveyed volume and delivery volume in spray bar |
| DE102013205471A1 (en) | 2013-03-27 | 2014-10-02 | Weitmann & Konrad Gmbh & Co Kg | Device for the distributed application of powder to moving printed products |
| CN103451589B (en) * | 2013-08-28 | 2017-01-25 | 黑龙江八一农垦大学 | Amorphous nanocrystalline wear-resistant coating material of agricultural implement soil-contacting part as well as plasma spraying method |
| CN106391347B (en) * | 2016-10-27 | 2019-12-06 | 湖南大学 | method for uniformly spraying diamond abrasive particles atomized by electromagnetic field |
| CN111330754B (en) * | 2020-04-22 | 2022-01-25 | 湖南大学 | Electrostatic spraying magnetic field assisted photocuring method and device |
| CN115739574B (en) * | 2022-12-03 | 2023-06-30 | 西北工业大学 | Method and device for preparing wetting gradient surface and magnetic hydrophobic particles |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2027087A (en) * | 1928-10-03 | 1936-01-07 | Behr Manning Corp | Abrasive sheet and process of making the same |
| US2569484A (en) * | 1947-11-03 | 1951-10-02 | Koppers Co Inc | Apparatus for coating sheet material with paraticulate material |
| US3423040A (en) * | 1963-06-10 | 1969-01-21 | Dow Chemical Co | Apparatus for dusting of surfaces |
| GB1273159A (en) * | 1968-09-19 | 1972-05-03 | Head Wrightson & Co Ltd | Method and apparatus for coating continuously moving surfaces |
| DE2052835A1 (en) * | 1969-10-20 | 1971-05-06 | Minnesota Mining & Mfg | Device for applying a magnetizable powder to a base |
| US4156036A (en) * | 1976-07-30 | 1979-05-22 | Epp Corp. | Structured donor sheet for high-resolution non-impact printer |
| 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 |
| US4283438A (en) * | 1979-12-26 | 1981-08-11 | Magnavox Government And Industrial Electronics Company | Method for individually encapsulating magnetic particles |
| JPS5831773A (en) * | 1981-08-18 | 1983-02-24 | Ricoh Co Ltd | Magnetic recording method |
| DE3145984A1 (en) * | 1981-11-20 | 1983-06-01 | Hoechst Ag, 6230 Frankfurt | METHOD AND DEVICE FOR TRANSMITTING A TONER IMAGE |
| DE3330665A1 (en) * | 1983-08-25 | 1985-03-14 | Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen | DEVICE FOR DUSTING MOVING OBJECTS, IN PARTICULAR AREA DOCUMENTS |
| JPS6424796A (en) * | 1987-07-22 | 1989-01-26 | Duplo Seizo Kk | Powder-applying printer |
| SU1713663A1 (en) * | 1990-04-04 | 1992-02-23 | Ленинградский научно-исследовательский институт гигиены труда и профессиональных заболеваний | Method for spraying powders of magnetic materials |
| US5447565A (en) * | 1993-12-10 | 1995-09-05 | Wm. Wrigley Jr. Company | Apparatus and method for coating particles |
| FR2724581B1 (en) * | 1994-09-15 | 1996-12-06 | Commissariat Energie Atomique | DEVICE FOR PROJECTING A COATING LOADED WITH MAGNETIC ELEMENTS |
-
1996
- 1996-09-04 DE DE19635830A patent/DE19635830A1/en not_active Withdrawn
-
1997
- 1997-08-13 AT AT97937575T patent/ATE223311T1/en not_active IP Right Cessation
- 1997-08-13 WO PCT/EP1997/004394 patent/WO1998009818A1/en active IP Right Grant
- 1997-08-13 EP EP97937575A patent/EP0925190B1/en not_active Expired - Lifetime
- 1997-08-13 JP JP10512161A patent/JP2000517259A/en active Pending
- 1997-08-13 DE DE59708137T patent/DE59708137D1/en not_active Expired - Lifetime
-
2000
- 2000-12-08 US US09/731,825 patent/US6447855B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE223311T1 (en) | 2002-09-15 |
| DE59708137D1 (en) | 2002-10-10 |
| EP0925190A1 (en) | 1999-06-30 |
| DE19635830A1 (en) | 1998-03-05 |
| WO1998009818A1 (en) | 1998-03-12 |
| JP2000517259A (en) | 2000-12-26 |
| US6447855B1 (en) | 2002-09-10 |
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