WO1998007568A1 - Systeme de saupoudrage d'objets en mouvement, notamment de feuilles de papier imprimees - Google Patents

Systeme de saupoudrage d'objets en mouvement, notamment de feuilles de papier imprimees Download PDF

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Publication number
WO1998007568A1
WO1998007568A1 PCT/EP1997/004393 EP9704393W WO9807568A1 WO 1998007568 A1 WO1998007568 A1 WO 1998007568A1 EP 9704393 W EP9704393 W EP 9704393W WO 9807568 A1 WO9807568 A1 WO 9807568A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
paper sheets
powder particles
charging
spray nozzle
Prior art date
Application number
PCT/EP1997/004393
Other languages
German (de)
English (en)
Inventor
Reiner Haas
Günter Hess
Original Assignee
Weitmann & Konrad Gmbh & Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weitmann & Konrad Gmbh & Co. Kg filed Critical Weitmann & Konrad Gmbh & Co. Kg
Publication of WO1998007568A1 publication Critical patent/WO1998007568A1/fr

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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
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts
    • 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
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes

Definitions

  • the invention relates to a device for dusting moving objects, in particular printed paper sheets, according to the preamble of claim 1.
  • Such devices for dusting are used in stacking devices for the printed paper sheets in a sheet-fed offset printing machine.
  • the problem arises that the very fine-grained powder, which is applied to the paper sheets with an air stream, is only deposited to a small extent on the paper sheet. Due to the very high transport speeds of the paper sheets - approx. 15,000 sheets per hour - strong air turbulence occurs, so that a large part of the powder does not reach the paper sheet, but instead contributes to contamination of the printing machine and the ambient air.
  • the device according to the invention has means for electrically charging the powder particles with a specific polarity. If the means for transporting the objects, such as printed sheets of paper, carry electrical charges with the same polarity as the powder particles, they are electrostatically repelled by the means of transport and do not adhere to them. As a result, the transport means remain free of dirt, even though they are immediately adjacent to the powder during dusting.
  • the means of transport are usually made of metal and are insulated so that they can be connected to an electrical potential via an electrical connection.
  • the means of transport are covered with an insulating layer made of a material with a high specific resistance and good charging properties. Then the means of transport itself do not have to be connected to an electrical potential, but the insulating layer holds the charges once applied.
  • a charging device is provided according to claim 4, which is arranged against the transport direction at a distance from the nozzle. Then through that Charger does not interfere with the electric field for charging the powder particles, so that constant conditions prevail.
  • Suitable plastics for the insulating layer are polyethylene, polypropylene, polyester or fluorocarbons.
  • a spray rod having the spray nozzle carry charges with the same polarity as that of the powder. Then no powder can be deposited on the spray bar.
  • the spray nozzle according to claim 8 is housed in a housing, the powder is mainly limited to the inside of the housing and the rest of the machine can not get dirty.
  • the housing walls are advantageously charged at least on the inside, so that no powder adheres to the walls.
  • the housing advantageously acts like a Faraday cage.
  • the device according to the invention is used in a stacking device for printed paper sheets of a sheetfed offset printing machine according to claim 9.
  • the machine parts of the stacking device adjacent to the pollination device should prove also carry appropriate loads so that no powder can accumulate.
  • FIG. 1 shows a schematic illustration of a device according to the invention
  • FIG. 2 shows a further embodiment of the device
  • Figure 3 shows a third embodiment.
  • a device 10 for dusting moving objects has at least one spray nozzle 12, with which a powder-air mixture 14 can be sprayed onto a paper sheet 16 printed, for example, in a sheet-fed offset printing press. If a plurality of spray nozzles 12 are provided, these are attached to a spray rod 18 which extends transversely to a transport direction 20 at least across the width of the paper sheet 16.
  • Transport means 22 pull the paper sheet 16 in the transport direction 20.
  • the transport means 22 comprise grippers 24, which grip the paper sheet 16 on its front edge.
  • the spray nozzle 12 has at least one needle electrode 26 with, for example, negative polarity and a counter electrode 28, for example at ground potential, between which there is an electric field represented by field lines 30.
  • a corona discharge can burn between the electrodes 26 and 28, so that the Discharge of powder particles flying through can be charged electrically, for example negatively.
  • Such a spray nozzle is described in DE-OS 33 30 665 in detail.
  • the gripper 24 is also electrically charged with the same polarity as the powder particles - electrically negative in the exemplary embodiment shown in FIG. 1.
  • the paper sheet 16 is guided over a sheet guide plate 32 which is electrically neutral in the exemplary embodiment according to FIG. 1.
  • the powder particles are guided on the one hand by the air and on the other hand due to the electrical forces of an electrical field formed between the gripper 24 and the sheet guide plate 32 and represented by lines 34 on the paper sheet 16.
  • the transport means 24 consist of an electrically conductive material, such as metal, and are mounted in an insulating manner in the printing press, so that they can be placed on an electrical potential — electrically negative in FIG. 1 — via an electrical connection.
  • the gripper 24 is electrically neutral and has on its surface an insulating layer 36 made of a material with a high specific resistance and good charging properties.
  • a charging device 38 is arranged at a distance a, by means of which the insulating layer 36 of the gripper 24 moved in the transport direction 20 can be charged via an electrode 40.
  • the insulating layer is preferably made of a plastic, such as polyethylene, polypropylene, polyester or fluorocarbons.
  • FIG. 2 shows the charging of the insulating layer 36 with the same charge as that of the charged powder particles - in this case, therefore, negative.
  • the sheet guide plate 32 is at a positive potential.
  • the spray nozzle 12 is accommodated together with the spray rod 18 in a housing 42.
  • the housing walls 44, 46 and 48 are electrically charged at least on the inside with the same polarity as the powder, for example negative.
  • the gripper 24 (not shown in FIG. 3) can be carried out together with the paper sheet 16 and over the sheet guide plate 32.
  • the sheet guide plate is positively charged, so that between the housing 42 and the sheet guide plate 32 the field shown with field lines 50 is built up, which exerts a force on the powder particles negatively charged in this example in the direction of the paper sheet.
  • the sheet guide plate 32 in the illustrated exemplary embodiments is either electrically neutral or charged with the opposite polarity to the powder, no powder will be deposited on the sheet guide plate 32, since the spray nozzle 12 operates in a pulsed manner and the powder-air mixture only releases when a paper sheet 16 is in the Spray area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Abstract

La présente invention concerne un système de saupoudrage d'objets en mouvement, notamment de feuilles de papier (16) imprimées, comprenant au moins un pulvérisateur pour projeter un mélange d'air et de poudre (14), des dispositifs (26, 28) pour charger électriquement les particules de poudre avec une certaine polarité, ainsi que des dispositifs de transport (22, 24) pour lesdits objets. Pour que la poudre retombe bien sur les feuilles de papier et que l'imprimante s'encrasse moins, il est proposé que les dispositifs de transport (24) aient des charges électriques de la même polarité que les particules de poudre.
PCT/EP1997/004393 1996-08-16 1997-08-13 Systeme de saupoudrage d'objets en mouvement, notamment de feuilles de papier imprimees WO1998007568A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19632899.3 1996-08-16
DE19632899A DE19632899A1 (de) 1996-08-16 1996-08-16 Vorrichtung zum Bestäuben bewegter Gegenstände, insbesondere bedruckter Papierbögen

Publications (1)

Publication Number Publication Date
WO1998007568A1 true WO1998007568A1 (fr) 1998-02-26

Family

ID=7802702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/004393 WO1998007568A1 (fr) 1996-08-16 1997-08-13 Systeme de saupoudrage d'objets en mouvement, notamment de feuilles de papier imprimees

Country Status (2)

Country Link
DE (1) DE19632899A1 (fr)
WO (1) WO1998007568A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0847856A3 (fr) * 1996-12-10 1998-12-30 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif pour saupoudrer des feuilles
DE19829490A1 (de) 1998-07-01 2000-01-05 Spectris Gmbh Verfahren und Vorrichtung zur Verbesserung einer Strichoberfläche von Papierbahnen
FI112685B (fi) * 2002-03-14 2003-12-31 Metso Paper Inc Menetelmä jauhemaisten partikkelien käsittelemiseksi
FI121810B (fi) 2002-03-14 2011-04-29 Metso Paper Inc Menetelmä kalvon muodostamiseksi
DE102005032801B4 (de) * 2005-07-14 2010-07-01 Manroland Ag Verfahren und Vorrichtung zum Bepudern von Bedruckstoffen
DE102005055111A1 (de) * 2005-11-18 2007-05-24 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen
DE102008047713B4 (de) 2008-09-18 2013-02-28 Weitmann & Konrad Gmbh & Co Kg Verfahren und Vorrichtung zum Aufbringen von Puder auf einen bedruckten Bogen oder eine bedruckte Bahn
DE202009016037U1 (de) 2009-11-24 2010-02-25 Manroland Ag Vorrichtung zum Bepudern von Bedruckstoffen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936754A1 (de) * 1979-09-12 1981-04-02 Weitmann & Konrad GmbH & Co KG, 7023 Echterdingen Vorrichtung zum elektrostatischen auftragen von in einem gasstrom mitgefuehrten materialteilchen auf eine vorlaufende, flaechige unterlage

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Publication number Priority date Publication date Assignee Title
US3536580A (en) * 1967-10-13 1970-10-27 Ransburg Electro Coating Corp Paper making methods and apparatus involving electrostatic spray coating
GB1549711A (en) * 1975-04-22 1979-08-08 Ball Corp Apparatus for applying lubricating materials to substrates
DE2839941C2 (de) * 1978-09-14 1983-02-17 Kühn, Vierhaus & Cie AG, 4050 Mönchengladbach Elektrostatische Beflockungseinrichtung für die Herstellung von Flockgarn
DE3015929A1 (de) * 1980-04-25 1981-11-05 Ernst St.Gallen Lehmann Kabine zur pulver-spruehbeschichtung
DE3135220A1 (de) * 1981-09-05 1983-03-17 Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen Vorrichtung zum aufbringen von puderteilchen
JPS644272A (en) * 1987-06-24 1989-01-09 Hideo Nagasaka Electrostatic powder coating device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936754A1 (de) * 1979-09-12 1981-04-02 Weitmann & Konrad GmbH & Co KG, 7023 Echterdingen Vorrichtung zum elektrostatischen auftragen von in einem gasstrom mitgefuehrten materialteilchen auf eine vorlaufende, flaechige unterlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
">>PUDERN ODER BESTÄUBEN-VERSTAUBT ODER AKTUELL?<<", DEUTSCHER DRUCKER, vol. 25, no. 7, 23 February 1989 (1989-02-23), pages W28 - W30, XP000007682 *

Also Published As

Publication number Publication date
DE19632899A1 (de) 1998-02-19

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