EP1787724B1 - Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression - Google Patents

Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression Download PDF

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Publication number
EP1787724B1
EP1787724B1 EP06023184A EP06023184A EP1787724B1 EP 1787724 B1 EP1787724 B1 EP 1787724B1 EP 06023184 A EP06023184 A EP 06023184A EP 06023184 A EP06023184 A EP 06023184A EP 1787724 B1 EP1787724 B1 EP 1787724B1
Authority
EP
European Patent Office
Prior art keywords
tank
air
powder
housing
powder 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.)
Not-in-force
Application number
EP06023184A
Other languages
German (de)
English (en)
Other versions
EP1787724A2 (fr
EP1787724A3 (fr
Inventor
Pierre Prost
Frank Seidel
Edgar Werber
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 EP1787724A2 publication Critical patent/EP1787724A2/fr
Publication of EP1787724A3 publication Critical patent/EP1787724A3/fr
Application granted granted Critical
Publication of EP1787724B1 publication Critical patent/EP1787724B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a device for powdering or dusting of substrates. Furthermore, the invention relates to a method for powdering or dusting of substrates.
  • powder printed substrates with powder or to dust In printing technology, it is already state of the art to powder printed substrates with powder or to dust. In sheet-fed printing machines, 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. In the state of the art, powdering or dusting of printing materials is carried out in such a way that powder is directed onto a printed printing material with the aid of compressed air. This is what the DE 196 35 830 A1 as well as the DE 198 36 014 A1 each devices for dusting or powdering of substrates, in which the powder is directed with the aid of a jet of compressed air to the substrates.
  • the present invention based on the problem of creating a novel device and a novel method for powdering or dusting of substrates.
  • the inventive device has at least one container, wherein at least air, preferably a powder-air mixture, is insertable into the container via at least one air inlet opening, wherein at least air from the container via at least one air outlet opening is executable, wherein the or each air inlet opening with an inlet air supply and the or each air outlet opening is coupled to an outlet air supply, via which an air inlet flow and an air outlet flow are adjustable so that a pressure prevailing in the container corresponds approximately to an ambient pressure, and wherein the powder particles executable on at least one powder outlet opening and on a to be powdered or to be pollinated printing material conveying air flow can be directed.
  • the powder particles to be conveyed onto a printing substrate can be moved on the printing substrate on the basis of the kinetic energy adhering to the powder particles, without the presence of a conveying air flow. Accordingly, the powder particles are thrown, so to speak, in the direction of the printing material or shot, without a conveying air flow in the form of a compressed air jet being used for transporting the same in the direction of the printing material. When powdering or dusting the substrates, therefore, the transport of the same is not affected. Furthermore, it is avoided that directed in the direction of the powdered to be powdered or to be printed substrate powder particles in the printing press uncontrolled. This reduces the health risk for people working in a printing company.
  • the or each air inlet port is configured to allow powder particles to be moved past an inner surface of a wall of the container and to be electrostatically charged by friction on the inner surface of the container.
  • the powder particles directed onto the printing substrate are therefore electrostatically charged.
  • the or each air inlet opening is integrated into a wall of the container such that via the or each air inlet opening air, preferably the powder-air mixture, tangentially to the wall of the container in the same is inserted.
  • the container is surrounded by a housing such that electrostatically charged powder particles can be directed via at least one powder outlet opening of the container into the housing and via at least one powder outlet opening of the housing onto the substrate to be powdered or dusted, wherein the or each Puderauslassö réelle of the housing is integrated in a wall of the housing such that an exit direction of the powder particles from the housing on the one hand approximately tangential to the wall of the housing and on the other hand approximately perpendicular to the substrate to be powdered.
  • the present invention will be described with reference to FIG Fig. 1 to 4 using the example of powdering or pollination of sheet in more detail.
  • the invention can also be used for powdering or dusting web-like substrates.
  • Fig. 1 to 3 show very schematically a first embodiment of a device according to the invention for powdering or dusting of printed sheet 10, wherein for powdering or dusting the sheet 10, the same are moved past the device according to the invention.
  • Fig. 1 illustrates the transport direction of the sheet 10 along a transport path 11 with the arrow 12, wherein the sheets to be polled 10 are detected at a leading edge of a sheet transport device 13 and moved in the direction of the arrow 12 along the transport path 11.
  • the transport of the printed sheets 10 is stabilized via suction / blowing devices 14.
  • Fig. 1 is schematized the length of the sheet to be powdered 10 recognizable, in Fig. 2 but the width of the same.
  • Fig. 1 to 3 the device according to the invention for powdering or dusting of substrates via a plurality of modules 15, which are positioned transversely to the transport direction (arrow 12) of the sheet 10 over the width of the same with distance from each other.
  • powder particles 16 can be applied to the substrate 10, wherein each of the modules 15 thereby, as in Fig. 3 shown, is formed.
  • Fig. 3 shows a cross section through a module 15 along the cutting direction III-III in Fig. 1 ,
  • Each of the modules 15 of the device according to the invention for powdering or dusting the printed sheet 10 has according to Fig. 3 via a container 17, which preferably has a frusto-conical contour.
  • a container 17 which preferably has a frusto-conical contour.
  • an air inlet opening 18 which is coupled to an inlet air supply 19, air or a powder-air mixture inserted.
  • the air inlet opening 18 is in such a way integrated into a wall 20 of the container 17, that the air or the powder-air mixture can be introduced tangentially to the wall 20 of the container 17 in the container 17. Accordingly, the air inlet opening 18 is designed as a tangential air inlet opening, wherein powder particles can be moved past an inner surface 21 of the wall 20 by the tangential introduction of the air or of the powder-air mixture into the container 17.
  • the powder particles 16 are in the sense of a cyclonic flow on the inner surface 21 of the wall 20 of the container 17 movable past.
  • the container 17 has an air outlet opening 22, which is coupled to an outlet air supply 23.
  • Air can be carried out from the container 17 via the air outlet opening 22, wherein an air inlet flow flowing into the container 17 via the air inlet opening 18 into the container 17 and an air outlet flow flowing out of the container 17 via the air inlet opening 18 can be adjusted via the inlet air supply 19 and the outlet air supply a pressure prevailing in the container 17 corresponds approximately to the ambient pressure of the respective module 15.
  • the pressure provided by the inlet air supply 19, prevailing in the region of the air inlet opening is greater than the ambient pressure
  • the pressure provided by the outlet air supply 23 and prevailing in the region of the air outlet opening 22 is less than the ambient pressure.
  • the powder particles on the inner surface 21 of the wall 20 of the container 17 contacting moving and preferably charged by friction on the inner surface 21 of the wall 20 of the container 17 electrostatically or triboelectrically.
  • the preferably electrostatically charged powder particles 16 pass from the container 17 into a housing 25 surrounding the container 17, starting from the housing 25, the preferably electrostatically charged powder particles 16 via a Puderauslassö réelle 26 of the housing 25 from the housing 25 executable and can be directed to the sheet 10.
  • the preferably electrostatically charged powder particles are thus directed euerluftstromlos on the sheet to be powdered 10 and thus thrown so to speak in the direction of the sheet 10.
  • the modules need not have a housing. Rather, the powder particles electrostatically charged in the container 17 can be directed via a corresponding powder outlet opening of the container directly onto the printed sheets to be powdered. In this case, the powder outlet opening introduced into the container is then designed analogously to the powder outlet opening 26 of the housing 25, the powder outlet opening 24 of FIG Fig. 3 is then closed or not available.
  • the already mentioned powder outlet opening 26 is introduced into a wall of the housing 25.
  • the powder outlet opening 26 of the housing 25 is integrated in a wall of the housing 25 in such a way that an exit direction of the powder particles from the housing 25, which in FIG Fig. 2 is shown by arrows 27, approximately tangential to the wall of the housing 25 and approximately perpendicular to the sheet to be powdered 10 runs.
  • the preferably electrostatically charged powder particles 16 thus leave the modules 15 in an exit direction 27, which runs tangentially to a wall of the housing 25 and perpendicular to the printed sheet 10.
  • the container is not surrounded by a housing but the powder particles preferably charged electrostatically in the container are directed directly over the container onto the sheet to be powdered, the powder outlet opening integrated in the container is designed analogously to the powder outlet opening of the housing.
  • the inner surface 21 of the container 17 is formed of a conductive material or coated with such a material, said material to the material of the powder particles 16 a relatively large having electrostatic or triboelectric distance in a so-called triboelectric series. This ensures that the powder particles can be electrostatically charged by friction when contacting the inner surface 17 of the container 20. In the embodiment shown, the powder particles 16 are charged positively.
  • an inner surface 28 of the housing 25 may be formed of such an electrostatically conductive material or coated with such a material. In this case, the powder particles 16 are then electrostatically charged by friction on the inner surface 28 of the housing 25 even during the contacting advancing movement.
  • Fig. 3 shows, the housing 25 and thus also the container 17 of each module 15 of the device according to the invention is connected to a ground potential 29. In this way, it can be ensured that in the case of the triboelectric charging of the powder particles the same positive charge carriers can be refilled in the area of the container 17 and of the housing 25, so that powder particles 16 can be charged safely electrostatically or triboelectrically over the entire operating period.
  • the powder outlet openings 26 of the housing 25 can be controlled or regulated in their open position.
  • the size of the powder discharge openings 26 can be adjusted to adjust the amount of the powder particles 16 to be conveyed onto the printed sheets 10.
  • an adjustment mechanism (not shown).
  • the relatively small and light powder particles can be sucked or removed together with the air from the container 17, wherein the relatively small and light powder particles are preferably trapped or retained on a filter 32 in the region of the air outlet 22nd is positioned. This avoids that relatively light and small powder particles escape into the environment and can be inhaled by persons working in the printer. The danger of health impairments is thereby significantly minimized.
  • a powder-air mixture is preferably introduced into the container 17 via the air inlet opening 18.
  • Fig. 1 to 3 are across the width of the sheet to be dusted 10 several modules 15 spaced from each other.
  • Fig. 4 shows that the device according to the invention has only a single Modul.15, which then extends over the entire width of the printed sheet 10 to be dusted.
  • the embodiment of the Fig. 4 with the embodiment of Fig. 1 to 3 match, so that reference may be made to the above statements.
  • the powder outlet openings 26 each extend over the entire width of the housing 25 of the corresponding module 15. It should be noted at this point that the powder outlet opening 26 of the modules 15 can also have a smaller width than the housing 15. Furthermore, as seen across the width of the module, a plurality of powder outlet openings 26 can be integrated into the housing 25 of the module at a distance from one another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Printing Methods (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Claims (11)

  1. Dispositif de poudrage ou d'empoussiérage de supports d'impression, notamment de feuilles d'impression, comportant au moins un réservoir (17), au moins de l'air, de préférence un mélange poudre-air, pouvant être introduit dans le réservoir (17) via au moins un orifice d'admission d'air (18), au moins de l'air pouvant être évacué du réservoir. (17) via au moins un orifice d'échappement d'air (22), l'orifice ou chaque orifice d'admission d'air (18) étant couplé à une alimentation d'air en air d'admission (19) et l'orifice ou chaque orifice d'échappement d'air (22) étant couplé à une alimentation en air d'échappement (23) et des particules de poudre (16) pouvant être évacuées via au moins un orifice d'échappement de poudre et être dirigées sur un support d'impression (10) à poudrer ou à empoussiérer sans courant d'air de convoyage,
    caractérisé en ce que
    un flux d'admission d'air peut être établi via l'orifice d'admission d'air (18) et un flux d'échappement d'air via l'orifice d'échappement d'air (22),
    une pression régnant dans le réservoir (17) équivaut approximativement à une pression ambiante et
    les particules de poudre (16.) peuvent passer devant la surface intérieure (21) du réservoir (17) sous la forme d'un flux de type cyclonique.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    l'orifice ou chaque orifice d'admission d'air (18) est conçu de manière à ce que les particules de poudre (16) puissent passer en la touchant devant la surface intérieure (21) d'une paroi (20) du réservoir (17) et puissent ainsi être chargées électrostatiquement par friction sur la surface intérieure (21) du réservoir (17).
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    l'orifice ou chaque orifice d'admission d'air (18) est réalisé sous forme d'un orifice d'admission d'air tangentiel qui est intégré dans une paroi (20) du réservoir de manière à ce que de l'air (18), de préférence le mélange poudre-air, puisse être introduit dans ce dernier tangentiellement par rapport à la paroi du réservoir (17) via l'orifice ou chaque orifice d'admission d'air (18).
  4. Dispositif selon une ou plusieurs des revendications 1 à 3,
    caractérisé en ce que
    le réservoir (17) présente au moins un orifice d'échappement de poudre tangentiel qui est intégré dans une paroi (20) du réservoir (17) de manière à ce qu'un sens de sortie des particules de poudre hors du réservoir (17) s'étende d'une part approximativement tangentiellement par rapport à la paroi du réservoir (17) et d'autre part approximativement à la perpendiculaire du support d'impression à imprimer, de sorte que les particules de poudre chargées électrostatiquement peuvent être dirigées directement via l'orifice ou chaque orifice d'échappement de poudre du réservoir sur le support d'impression.
  5. Dispositif selon une ou plusieurs des revendications 1 à 3,
    caractérisé en ce que
    le réservoir (17) est entouré d'un boîtier (25) de manière à ce que les particules de poudre chargées électrostatiquement puissent être dirigées via au moins un orifice d'échappement de poudre (24) du réservoir (17) dans le boîtier (25) et via au moins un orifice d'échappement de poudre (26) du réservoir (17) du boîtier (25) sur le support d'impression à poudrer ou à empoussiérer.
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    l'orifice ou chaque orifice d'échappement de poudre (26) du boîtier (25) est réalisé sous forme d'un orifice d'échappement de poudre tangentiel qui est intégré dans une paroi du boîtier (25) de manière à ce qu'un sens de sortie des particules de poudre hors du boîtier (25) s'étende d'une part approximativement tangentiellement par rapport à la paroi du réservoir (17) et d'autre part approximativement à la perpendiculaire du support d'impression à poudrer, de sorte que les particules de poudre chargées électrostatiquement peuvent être dirigées directement via l'orifice ou chaque orifice d'échappement de poudre (26) du boîtier (25) sur le support d'impression.
  7. Dispositif selon la revendication 5 ou 6,
    caractérisé en ce que
    l'orifice ou chaque orifice d'échappement de poudre (24) du réservoir (17) débouche dans le boîtier (25) dans le sens axial.
  8. Dispositif selon une ou plusieurs des revendications 1 à 7,
    caractérisé en ce que
    la surface intérieure (21) du réservoir (17) et/ou la surface intérieure (28) du boîtier (25) entourant éventuellement le réservoir (17) est faite d'un matériau conducteur ou est revêtue d'un matériau de ce genre qui présente un écart électrostatique ou triboélectrique relativement grand par rapport au matériau des particules de poudre.
  9. Dispositif selon une ou plusieurs des revendications 1 à 8,
    caractérisé en ce que
    l'alimentation en air d'admission (19) et l'alimentation en air d'échappement (23) peuvent être commandées ou réglées de manière à ce qu'une pression régnant dans le réservoir (17) et éventuellement la pression régnant dans le boîtier (25) entourant le réservoir (17) soit approximativement équivalente à la pression régnant dans l'air ambiant, de sorte que les particules de poudre chargées électrostatiquement, du fait de leur énergie cinétique et par conséquent sans courant d'air de convoyage, peuvent être transportées en direction du support d'impression à poudrer ou à empoussiérer.
  10. Dispositif selon une ou plusieurs des revendications 1 à 9,
    caractérisé par
    au moins une électrode (30) qui est positionnée sur une face opposée au réservoir (17) du support d'impression à poudrer, l'électrode ou chaque électrode attirant les particules de poudre chargées électrostatiquement et contribuant ainsi au poudrage ou à l'empoussiérage du support d'impression.
  11. Procédé de poudrage ou d'empoussiérage de supports d'impression, notamment de feuilles d'impression, des particules de poudre passant devant une surface intérieure du réservoir (17) via un courant d'air de type cyclonique régnant dans un réservoir (17) et la pression régnant dans le réservoir (17) étant approximativement équivalente à une pression ambiante, de sorte que les particules de poudre sont évacuées du réservoir (17) et dirigées sur un support d'impression (10) à poudrer ou à empoussiérer sans courant d'air de convoyage.
EP06023184A 2005-11-18 2006-11-08 Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression Not-in-force EP1787724B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005055111A DE102005055111A1 (de) 2005-11-18 2005-11-18 Vorrichtung und Verfahren zum Bepudern bzw. Bestäuben von Bedruckstoffen

Publications (3)

Publication Number Publication Date
EP1787724A2 EP1787724A2 (fr) 2007-05-23
EP1787724A3 EP1787724A3 (fr) 2010-05-05
EP1787724B1 true EP1787724B1 (fr) 2011-08-03

Family

ID=37776036

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06023184A Not-in-force EP1787724B1 (fr) 2005-11-18 2006-11-08 Dispositif et processus de poudrage ou saupoudrage d'un substrat d'impression

Country Status (3)

Country Link
EP (1) EP1787724B1 (fr)
AT (1) ATE518599T1 (fr)
DE (1) DE102005055111A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009288A1 (de) 2008-02-15 2009-08-20 Manroland Ag Verfahren und Vorrichtung zum Bepudern bzw. Bestäuben von Bedruckstoffen
DE102008009289A1 (de) 2008-02-15 2009-08-20 Manroland Ag Vorrichtung zum Bepudern bzw. Bestäuben von Bedruckstoffen
DE102008009287A1 (de) 2008-02-15 2009-08-20 Manroland Ag Verfahren und Vorrichtung zum Bepudern bzw. Bestäuben von Bedruckstoffen
DE102013010318A1 (de) 2012-07-13 2014-01-16 Heidelberger Druckmaschinen Ag Pudervorrichtung für eine Druckmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19625099A1 (de) * 1996-06-24 1998-01-02 Heidelberger Druckmasch Ag Verfahren zum Pudern einer bedruckten Oberfläche eines Bedruckstoffes
DE19632899A1 (de) * 1996-08-16 1998-02-19 Weitmann & Konrad Fa Vorrichtung zum Bestäuben bewegter Gegenstände, insbesondere bedruckter Papierbögen

Also Published As

Publication number Publication date
EP1787724A2 (fr) 2007-05-23
ATE518599T1 (de) 2011-08-15
EP1787724A3 (fr) 2010-05-05
DE102005055111A1 (de) 2007-05-24

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