EP2090380A1 - Dispositif de poudrage ou de saupoudrage de matières d'impression - Google Patents

Dispositif de poudrage ou de saupoudrage de matières d'impression Download PDF

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Publication number
EP2090380A1
EP2090380A1 EP09151488A EP09151488A EP2090380A1 EP 2090380 A1 EP2090380 A1 EP 2090380A1 EP 09151488 A EP09151488 A EP 09151488A EP 09151488 A EP09151488 A EP 09151488A EP 2090380 A1 EP2090380 A1 EP 2090380A1
Authority
EP
European Patent Office
Prior art keywords
cyclone
powder particles
wheel
relatively
powder
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.)
Withdrawn
Application number
EP09151488A
Other languages
German (de)
English (en)
Inventor
Lars Bohlen
Pierre Prost
Frank Seidel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
Manroland AG
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 Manroland AG filed Critical Manroland AG
Publication of EP2090380A1 publication Critical patent/EP2090380A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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

Definitions

  • the invention relates to a device for powdering or dusting substrates according to the preamble of claim 1.
  • the powdering or pollination of printed printed sheets serves to prevent blocking of the printed sheets in the area of the delivery arm. Furthermore, the powder applied to the printing sheets can facilitate the drying of the applied printing ink.
  • the powder particles which are thrown onto the printing substrate with a cyclone or the powder particles which are directed onto the printing material by means of a powder-air mixture comprise powder particles of different sizes, but only those powder particles are to be directed onto the printing material, which in terms of their size or their weight are above a threshold. Too small or too light powder particles tend namely to spread undefined after leaving the Bepud réelles owned and before reaching the substrate in the environment of the sheet-fed press, whereby the sheet-fed press can pollute.
  • the present invention based on the problem of creating a novel device and a novel method for powdering or dusting of substrates.
  • a classifier wheel is positioned in the cyclone which rotates relative to the fixed cyclone such that relatively large or relatively heavy powder particles are moved radially outward against a wall of the cyclone so that they leave the cyclone in the continuous stream of powder particles and on the Are relatively small or relatively light powder particles are moved radially inward in a cavity enclosed by the sorterrad so that they do not leave the cyclone in the continuous stream of powder particles.
  • a separator wheel is positioned within the stationary cyclone.
  • the classifier wheel which rotates relative to the fixed cyclone, allows effective separation between the relatively large and relatively heavy powder particles which are to leave the cyclone and be directed onto the substrate from the relatively small or relatively light powder particles containing the cyclone should not leave. This makes it possible to effectively avoid contamination of the printing machine as well as health impairments for persons working on the printing machine.
  • Fig. 1 shows a schematic representation of a device according to the invention for powdering or dusting of substrates, wherein the device comprises a trained as a cyclone 10 powdering module.
  • the cyclone 10 is a fixed, cylindrical container to which a continuous stream of a powder-air mixture 12 is supplied via a feed line 11, wherein the powder-air mixture 12 into the cyclone 10 with an inlet velocity V Z, An entrance. From the cyclone 10 exits a continuous stream 13 of powder particles 14, wherein the powder particles 14 are thrown from the cyclone 10 in the direction of a substrate to be powdered 15. The powder particles 14 leave the cyclone 10 at a defined exit velocity V Z, AUS .
  • a classifying wheel 16 is positioned in the cyclone 10.
  • the cyclone 10 surrounds according to Fig. 2, 3rd the preparerrad 16 preferably concentric.
  • the classifier wheel 16 rotates relative to the stationary cyclone 10, the classifier wheel 16 having a peripheral speed V SR .
  • the powder particles entering the cyclone 10 stream from the powder-air mixture 12 are moved depending on their size or their weight either radially outward against a cylindrical wall of the cyclone 10 or radially inwardly into a space enclosed by the reformerrad 16 cavity 17th , wherein for this purpose 16 slots 18 are introduced into a wall of the classifier wheel.
  • Relatively large or relatively heavy powder particles are in the direction of arrows 19 radially outward moved against the wall of the cyclone 10 so that they leave the cyclone 10 in the continuous stream 13 of powder particles 14 and can be directed to the substrate 15.
  • relatively small or relatively light powder particles are moved radially inward in the cavity 17 enclosed by the separator wheel 16 in the direction of the arrows 20, so that they do not leave the cyclone 10 in the continuous stream 13 of powder particles 14.
  • the limit value between the relatively large or relatively heavy powder particles which are to be directed onto the printing material 15 and the relatively small or relatively light powder particles which are not intended to be directed onto the printing material 15 can be determined by a relative speed between the entry speed V Z , A of the powder-air mixture 12 in the cyclone and the peripheral speed V SR of reformerrads 16 or by a relative speed between the exit velocity V Z, AUS of the powder particles 13 from the cyclone 10 and the peripheral speed V SR of detoxerrads 16 are determined. Furthermore, this limit value depends on the difference between the radius of the cyclone 10 and the radius of the separator wheel 16.
  • the cyclone 10 is supplied with a continuous flow 12 of a powder-air mixture via the supply line 11, wherein the supply line 11 opens into the cyclone 10 via an inlet 21.
  • the powder-air mixture 12 is provided by mixing in a metering unit or mixing unit 22 an air stream 25 provided by a fan 23 and a valve 24 with powder particles 26 of a powder supply 27.
  • relatively small or relatively light powder particles which enter the cavity 17 of the separator wheel 16 can be removed with the aid of a dip tube 28 from the classifier wheel 16 and thus from the cyclone 10.
  • a stream 29 of relatively small or light powder particles is fed to a cyclone 30, in which the relatively small or relatively light powder particles are separated from the air and collected in a dust bunker 31. Via rotary valves 32, the dust bunker 31 can be emptied during operation.
  • An air stream 33 separated from the relatively small or relatively light powder particles in the cyclone 30 can be removed by means of a blower 34 and a valve 35 as well as a discharge line 36.
  • the supply line 11 opens for the powder-air mixture 12 in the cyclone 10 in an inlet 21, wherein the inlet 21 can be designed tangentially or spirally or helically.
  • the inlet height of the inlet 21 is at least 1.5 times as large as the inlet width of the inlet 21st
  • the relatively heavy or relatively large powder particles are, as already mentioned, pressed radially outward against the wall of the cyclone 10, wherein the wall of the cyclone 10 is preferably carried out hydraulically smooth.
  • the wall of the cyclone 10 can also be provided with spiral grooves, or have so-called baffles, which ensure that an agglomeration of powder particles is reduced.
  • a secondary air inlet may be integrated into the wall of the cyclone 10, which additionally prevents agglomeration of powder particles.
  • Radially inside, the wall of the cyclone 10 is preferably made of a material that promotes electrostatic or triboelectric charging of the powder particles on the wall of the cyclone 10.
  • the reformerrad 16 is connected to a ground potential 37 and therefore grounded.
  • Relatively large or relatively heavy powder particles 14 are thrown onto the printing substrate 15 with the aid of the cyclone 10, the cyclone 10 having a nozzle-like outlet 38 through which the relatively large or relatively heavy, electrostatically charged powder particles 14 leave the cyclone 10.
  • the nozzle-like outlet 38 is preferably round or oval or slot-shaped and arranged parallel to the axis of the separator wheel 16.
  • a nozzle width of the nozzle-like outlet 38 corresponds at most to the inlet height of the inlet 21.
  • the nozzle-like outlet 38 have a nozzle guide 39, the maximum reaches up to an outer radius of the separator wheel 16 and is directed in the direction of the substrate 15 to be gepauternden.
  • the classifier wheel 16 is positioned centrally in the cyclone 10.
  • an eccentric arrangement of the crusherrads 16 in the cyclone 10 is possible.
  • the exit velocity V Z, OUT of the powder particles 13 from the cyclone 10 corresponds at most to the entrance velocity V Z, EIN of the flow from the powder-air mixture 12 into the cyclone 10. Since the powder particles are braked on the wall of the cyclone 10, the Exit velocity V Z, OFF typically less than the entrance velocity V Z, ON .
  • Fig. 2 is the peripheral speed V SR of reformerrads 16 opposite to the entrance velocity V Z, A directed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cyclones (AREA)
EP09151488A 2008-02-15 2009-01-28 Dispositif de poudrage ou de saupoudrage de matières d'impression Withdrawn EP2090380A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810009289 DE102008009289A1 (de) 2008-02-15 2008-02-15 Vorrichtung zum Bepudern bzw. Bestäuben von Bedruckstoffen

Publications (1)

Publication Number Publication Date
EP2090380A1 true EP2090380A1 (fr) 2009-08-19

Family

ID=40619537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09151488A Withdrawn EP2090380A1 (fr) 2008-02-15 2009-01-28 Dispositif de poudrage ou de saupoudrage de matières d'impression

Country Status (2)

Country Link
EP (1) EP2090380A1 (fr)
DE (1) DE102008009289A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460725A1 (fr) * 1979-07-02 1981-01-30 Kawasaki Heavy Ind Ltd Appareil de separation a air pour separer des materiaux constitues de petites particules de materiaux constitues de grosses particules en utilisant un courant d'air
US4257880A (en) * 1979-06-28 1981-03-24 Jones Donald W Centrifugal air classifying apparatus
EP0468426A2 (fr) * 1990-07-23 1992-01-29 Kubota Corporation Séparateur pour des matières poudreuses
US20040238415A1 (en) * 2003-05-29 2004-12-02 Alstom (Switzerland) Ltd High efficiency two-stage dynamic classifier
DE102005019363A1 (de) 2005-04-26 2006-11-02 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen
EP1787724A2 (fr) * 2005-11-18 2007-05-23 MAN Roland Druckmaschinen AG Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4257880A (en) * 1979-06-28 1981-03-24 Jones Donald W Centrifugal air classifying apparatus
FR2460725A1 (fr) * 1979-07-02 1981-01-30 Kawasaki Heavy Ind Ltd Appareil de separation a air pour separer des materiaux constitues de petites particules de materiaux constitues de grosses particules en utilisant un courant d'air
EP0468426A2 (fr) * 1990-07-23 1992-01-29 Kubota Corporation Séparateur pour des matières poudreuses
US20040238415A1 (en) * 2003-05-29 2004-12-02 Alstom (Switzerland) Ltd High efficiency two-stage dynamic classifier
DE102005019363A1 (de) 2005-04-26 2006-11-02 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen
EP1787724A2 (fr) * 2005-11-18 2007-05-23 MAN Roland Druckmaschinen AG Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression
DE102005055111A1 (de) 2005-11-18 2007-05-24 Man Roland Druckmaschinen Ag Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen

Also Published As

Publication number Publication date
DE102008009289A1 (de) 2009-08-20

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