EP1441192B1 - Dispositif pour remplacer, dans une couche limite laminaire d'air, l'oxygène par un gaz inerte, et son utilisation - Google Patents

Dispositif pour remplacer, dans une couche limite laminaire d'air, l'oxygène par un gaz inerte, et son utilisation Download PDF

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Publication number
EP1441192B1
EP1441192B1 EP03026135A EP03026135A EP1441192B1 EP 1441192 B1 EP1441192 B1 EP 1441192B1 EP 03026135 A EP03026135 A EP 03026135A EP 03026135 A EP03026135 A EP 03026135A EP 1441192 B1 EP1441192 B1 EP 1441192B1
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EP
European Patent Office
Prior art keywords
electrode
inert gas
substrate
corona electrode
transport direction
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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EP03026135A
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German (de)
English (en)
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EP1441192A2 (fr
EP1441192A3 (fr
Inventor
Lukas Hahne
Franz Knopf
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Eltex Elektrostatik GmbH
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Eltex Elektrostatik GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F26B7/002—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00 using an electric field and heat

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • Such a device is known for use in sheet-fed offset printing ( DE-100 50 517 A1 ), wherein, however, the first chamber has the means for supplying the inert gas.
  • UV dryers or plasma dryers are often formed as chambers and these are purged with the inert gas, for example nitrogen.
  • the inert gas for example nitrogen.
  • the inlet and outlet gaps for the substrate should be as small as possible in order to keep the nitrogen losses within limits.
  • Such chambers are known per se ( DE-198 57 984 A1 and DE-297 07 190 U1 ).
  • the known generic device ( DE-100 50 517 A1 ) according to the preamble of claim 1 is provided with such a chamber which is purged with inert gas.
  • the sealing of the chamber in the sheet-fed offset printing press is sealed off by the front corona electrode or further corona electrodes which are connected to a high direct voltage in the transport direction at the front and rear end edges.
  • the gaseous laminar air boundary layer which is carried by a moving substrate via a corona electrode which is connected to a positive or negative high voltage, with an associated counter electrode on the other To convert the side of the substrate into a turbulent flow ( DE-195 25 453 A1 ).
  • the invention has the object of developing a generic device according to the preamble of the main claim so as to suggest a use of the same, with which the amount of inert gas required and thus the operating costs can be considerably reduced.
  • the device according to the invention can be used in printing machines for gravure, flexographic, web offset or sheet-fed offset printing and in various coating processes, for example in the paper or textile industry, in which increasingly UV-curing inks or coatings -generally UV-curing systems called- are used. These contain a certain amount of so-called photoinitiators.
  • the curing or drying of such paints or varnishes takes place in a UV dryer.
  • narrow-band so-called UV excimer radiators or broadband UV radiators are used as radiation sources.
  • the photoinitiators absorb part of the UV radiation energy offered and trigger the polymarization or curing of the UV inks or lacquers.
  • the laminar air boundary layer entrained with the substrate moved in the transport direction reaches the area of the front corona field.
  • the existing at this existing electron or ion current hereinafter referred to briefly as electrons / ion current, generates an envelope from a laminar to a turbulent state on the surface of the moving substrate on one side, on which the front corona electrode is arranged.
  • the mostly turbulent air drag flow entrained above the laminar air boundary layer is deflected upwards in front of the front corona electrode and away from the moving substrate.
  • the turbulent air boundary layer forming behind the front corona electrode travels in the transport direction behind and at a distance from the further corona electrode, preferably parallel to the front corona electrode, to a laminar residual boundary layer moving further from the substrate perpendicular to the surface of the moving substrate within the first chamber deflected above as the main air flow and in the closed first chamber -in contrast to the transport direction- moved back and again in the region of the first corona electrode. Due to the gaps existing there between the individual electron / ion streams of the individual adjacent tips of the front corona electrode, this main air stream again moves outside the first chamber into the surrounding outer space and rises together with the air drag flow in front of the front corona electrode perpendicular to the substrate above.
  • the rear edge of the first -closed chamber in the transport direction forms a negative pressure area behind the further corona electrode arranged there.
  • the opening in the region of this negative pressure area means for supplying the inert gas so to speak sucked into the negative pressure area, so that builds on the moving substrate a -new laminar layer, but this time from inert gas as a laminar inert gas boundary layer with low turbulence.
  • the amount of inert gas required for sufficient inertization of the laminar inert gas layer is adjusted in dependence on the speed of the moving substrate so that a small inert gas leakage current moves in the opposite direction to the transport direction and ultimately escapes with respect to the deflected main air flow in the first chamber, then fills the original negative pressure area behind the other corona electrode completely with inert gas, so that there arises a slight overpressure, which prevents an air flow is sucked from the outer chamber surrounding the first chamber.
  • the consumption of inert gas for inerting the web-near inert gas boundary layer behind the other corona electrode compared to the prior art and up to 80% is reduced, which means a not inconsiderable saving on operating costs.
  • the required amount of expensive photoinitiators can be further reduced. At the same time this is associated with a decrease in the emanating from the photoinitiators disturbing odors. It is therefore future also produce products in which this odor was previously intolerable for reasons of hygiene.
  • the further chamber arranged between the further corona electrode and the device for supplying the inert gas preferably a chamber identical to the first chamber with the rear corona electrode and with its rear counterelectrode.
  • a dryer in the form of a UV radiation source is arranged directly behind the device for supplying the inert gas. Because of the low oxygen content in the layer close to the inert gas layer, the UV radiant power required for adequate curing of the UV inks and / or UV lacquers can be reduced by about 40%, based on the state of the art, with very low nitrogen consumption. In addition to the saving of electrical energy In addition, the infrared component of broadband UV lamps is also reduced, which is advantageous in the processing of heat-sensitive substrates such as PE film.
  • a final terminating corona electrode with associated counterelectrode is arranged on the other side of the substrate behind the UV radiation source and the entire arrangement is encapsulated in the manner of a chamber, then the essentially turbulent one, consisting essentially of inert gas, can be used Inertgasgrenz Anlagen located Schleppströmung in the chamber formed by the encapsulated formation - against the transport direction - are returned, so that a part of this inert gas is available again for the laminar inert gas boundary layer.
  • the reason for the return is the flow resistance of the terminal corona electrode created by the electron / ion current. Because of the associated low pressure increase in the encapsulated Chamber is an additional reduction of the inert gas consumption possible.
  • FIG. 1 is shown in schematic section a device according to the invention.
  • the moving in the transport direction 2 substrate 1 as a material web leads a laminar air boundary layer 3 with it.
  • the device is further comprising a chamber 41 which is open only to the substrate 1 and otherwise closed off from the surrounding outer space 40, which has a front corona electrode 5 for a high DC voltage and with a front corona electrode 5 at its leading end in the direction of transport 2 and extending transversely thereto front counterelectrode 7 on the other side 42 of the substrate 1 and in the transport direction 2 behind the front corona electrode (5) on the same side 40 of the substrate 1 as this in the region of the rear, also transverse to the transport direction 2 extending further end edge another corona electrode 6 for a high DC voltage having a further counter electrode 8 in the form of a resting single electrode on the other side 42 of the substrate.
  • the front counter electrode 7 is formed here, for example, as a guide roller, which is grounded.
  • the first chamber 41 is formed by the front corona electrode 5 and the further corona electrode 6 and by a single, upper electrode cover 19 which covers them and two lateral electrode covers 20 covering the two corona electrodes 5, 6 laterally.
  • the device for supplying the inert gas, preferably nitrogen, as inert gas nozzle 15 is arranged parallel to this, which is arranged close to the substrate 1 and aligned with this.
  • the device for supplying the inert gas has an inert gas distributor 14, on which the inert gas nozzle 15 is arranged.
  • Inertgasverteiler 14 is provided with a back in the transport direction 2, extending over the entire width of the substrate aperture 16 and two parallel to the transport direction to near the surface of one side of the substrate 1 extending side aperture 21, wherein the aperture 16 extending perpendicular to the substrate 1 is preferably aligned with the rear end of the inert gas distributor 14.
  • the front corona electrode 5 and the further corona electrode 6 each have single-tip electrodes, which lie in one plane and are equally spaced apart from each other in a pitch, as shown in FIG. 2 is shown, which are connected via current limiting resistors 29 to a high voltage generator 30, which in turn is connected to ground.
  • This schematic front view also shows in FIG. 1 shown schematic electron-ion current 9, which causes the envelope of the laminar flow 3 in the turbulent flow 10.
  • the individual tip electrodes of the further corona electrode 6 are offset by half the grid dimension 27 of the distance x / 2 with respect to the grid dimension 26 of the distance x of the single tip electrodes of the front corona electrode 5.
  • the laminar air boundary layer 3 entrained with the substrate 1 moved in the transport direction 2 passes into the region of the front corona elecrode 5.
  • the entrained, mostly turbulent air drag flow 4 is deflected upwards in front of the front corona electrode 5 and away from the moving substrate 1.
  • the behind the front corona electrode 5 forming turbulent Air boundary layer 10 is in the transport direction 2 behind and at a distance from the respect to the front corona electrode 5 preferably arranged in parallel further corona electrode 6 to a further from the substrate mitbewegten laminar residual boundary layer 23 (FIGS. FIG. 3 ) - deflected perpendicular to the surface of the moving substrate 1 within the first chamber 41 upwards as the main air flow 11 and in the closed first chamber 41 against the transport direction 2 back and moved back into the region of the first corona electrode 5.
  • a negative pressure area 12 is formed behind the further corona electrode 6 arranged there.
  • the inert gas nozzle 15 which opens in the area of this negative pressure area Inertgases sucks this in a sense in the negative pressure area 12, so that above the moving substrate 1 a -new laminar layer, but this time from inert gas as a laminar inert gas boundary layer 17 builds up with a low degree of turbulence.
  • the amount of inert gas required for sufficient inertization of the laminar inert gas boundary layer 17 is set in accordance with the velocity of the moving substrate so that a low inert gas leakage 18 moves counter to the transport direction 2 and finally passes together with the deflected main air flow 11 in the first chamber 41 with respect to this to the outside 40, then the original negative pressure area 12 fills behind the other corona electrode 6 completely with inert gas, so that there as a result low pressure arises, which prevents an air flow from the first chamber 41 surrounding outer space 40 is sucked.
  • the second embodiment according to FIG. 3 differs from the first embodiment in that between the further corona electrode 6 and the Inertgasverteiler 14 and the inert gas 15, a rear corona electrode 22 and another chamber 43, formed by the electrode cover 19 and the two side electrode covers 20 is formed in the
  • the further corona electrode 6 is a turbulent residual boundary layer 24 builds up without the remaining after the front corona electrode 5 remaining laminar boundary layer 23 is present measurable.
  • the single tip electrodes of the other Electrode 6 offset by half the pitch 27 of the distance x / 2 with respect to the front corona electrode 5 and the rear corona electrode 22.
  • the third embodiment according to FIG. 4 differs from the second embodiment ( FIG. 3 ) in that directly behind the inert gas distributor 14 a dryer, in the form of a UV radiation source 34 with a final quartz glass plate 35 which extends substantially parallel to the substrate 1, so that the inert gas boundary layer 17 formed by the inert gas nozzle 17 without the disruptive oxygen can have a positive effect on the drying or curing process.
  • the entire assembly is provided with a lower cover 37 and two side covers 36 which extend below the substrate 1 and arranged in the transport direction 2 behind the UV radiation source 34 final corona electrode 31, so that the laminar inert gas boundary layer 17 in a turbulent inert gas boundary layer 33 turns over and the mostly turbulent drag flow of the Intertgases 32 is stowed back into the space 38 between the quartz glass plate 35 and the substrate 1.
  • the turbulent inert gas layer 33 leaves the device in the outer space 40th

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Claims (17)

  1. Dispositif pour remplacer l'oxygène de l'air par un gaz inerte, par exemple N2, dans l'au moins une couche limite laminaire d'air (3) de substrats (1) déplacés dans la direction de transport (2), par exemple des bandes de matériau se déplaçant rapidement, avec une première chambre (41) ouverte uniquement vers le substrat et pour le reste isolée de l'espace extérieur environnant (40), qui présente, dans la région de son arête terminale avant dans la direction de transport et s'étendant transversalement à celle-ci, une électrode corona avant (5) pour une haute tension continue avec une contre-électrode avant (7) sur l'autre côté (42) du substrat (1) et, derrière l'électrode corona avant (5) dans la direction de transport (2), sur le même côté du substrat (1) que celle-ci, à l'autre arête terminale arrière s'étendant également transversalement à la direction de transport (2), une autre électrode corona (6) pour une haute tension continue avec une autre contre-électrode (8) sur l'autre côté (42) du substrat (1), et avec un dispositif pour amener le gaz inerte (15), caractérisé en ce que le dispositif pour amener le gaz inerte (15) débouche dans la région de la zone de dépression (12) se formant immédiatement derrière le courant d'électrons/ions (9) de l'autre électrode corona (6), par rapport à la direction de transport (2).
  2. Dispositif selon la revendication 1, caractérisé en ce que le dispositif pour amener le gaz inerte comprend un distributeur de gaz inerte (14) et est formé par une buse à gaz inerte (15), qui est disposée à proximité du substrat (1), débouche dans la zone de dépression (12) et est dirigée vers celle-ci.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le distributeur de gaz inerte (14) est pourvu d'un écran (16), situé à l'arrière dans la direction de transport (2) et s'étendant sur toute la largeur du substrat (1), et de deux écrans latéraux (21) s'étendant parallèlement à la direction de transport (2) jusqu'à proximité de la surface du substrat (1).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'écran (16) est placé au niveau de l'arête terminale du distributeur de gaz inerte (14), située à l'arrière dans la direction de transport.
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la première chambre (41) est formée par l'électrode corona avant (5) et l'autre électrode corona (6), un seul couvercle d'électrodes supérieur (19) recouvrant ces deux-ci ainsi que deux couvercles d'électrodes latéraux (20) recouvrant latéralement les deux électrodes corona.
  6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la contre-électrode avant (7) et/ou l'autre contre-électrode (8) est mise à la terre et est formée par un rouleau conducteur (7).
  7. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la contre-électrode avant (7) et/ou l'autre contre-électrode (8) est mise à la terre et est formée par une électrode immobile (8).
  8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'électrode corona avant (5) et/ou l'autre électrode corona (6) sont également espacées l'une de l'autre avec une dimension de grille (26) et présentent des pointes d'électrodes individuelles situées dans un plan, qui sont orientées vers le côté supérieur du substrat (1).
  9. Dispositif selon la revendication 8, caractérisé en ce que les pointes d'électrodes individuelles de l'électrode corona avant (5) sont disposées avec un décalage d'une demi-dimension de grille (27) par rapport à la dimension de grille (26) de l'autre électrode corona (6).
  10. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'une électrode corona arrière (22) avec une contre-électrode arrière (8) est disposée entre la buse à gaz inerte (15) et l'autre électrode corona (6) en formant une autre chambre (43).
  11. Dispositif selon la revendication 10, caractérisé en ce que l'autre chambre (43) est, comme la première chambre (41), formée par une électrode corona arrière (22), l'autre électrode corona (6), un seul couvercle d'électrodes supérieur (19) recouvrant ces deux-ci ainsi que deux couvercles d'électrodes latéraux (20) recouvrant latéralement les deux électrodes corona.
  12. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'une source de rayonnement UV (34) avec une vitre de quartz (35) isolant celle-ci, qui s'étend parallèlement au substrat (1), est disposée immédiatement derrière la buse à gaz inerte (15) dans la direction de transport (2).
  13. Dispositif selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'une source de rayonnement UV (34) avec une électrode corona d'extrémité (31) en plus d'une contre-électrode d'extrémité (7) sur l'autre côté du substrat (1) est disposée derrière la buse à gaz inerte (15) dans la direction de transport (2).
  14. Dispositif selon la revendication 13, caractérisé en ce que la contre-électrode d'extrémité (7) est formée par un rouleau conducteur mis à la terre.
  15. Dispositif selon la revendication 13 ou 14, caractérisé en ce que les couvercles d'électrodes latéraux (20) sont formés par un couvercle latéral (36) mené latéralement à côté du substrat (1) et jusque de l'autre côté (42) de celui-ci, qui est fermé sur l'autre côté (42) avec un couvercle de chambre inférieur (37).
  16. Dispositif selon l'une quelconque des revendications 13 à 15, caractérisé en ce que l'électrode corona d'extrémité (31) avec les couvercles latéraux (36) du couvercle de chambre inférieur (37) et les contre-électrodes (7) formées par des rouleaux conducteurs forment une structure de chambre.
  17. Utilisation du dispositif selon l'une quelconque des revendications 1 à 16 dans des machines d'impression pour l'impression en taille douce, l'impression flexographique, l'impression offset à bobines ou l'impression offset à feuilles, et dans des machines de revêtement, par exemple dans l'industrie du papier ou dans l'industrie textile.
EP03026135A 2003-01-22 2003-11-13 Dispositif pour remplacer, dans une couche limite laminaire d'air, l'oxygène par un gaz inerte, et son utilisation Expired - Lifetime EP1441192B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10302367 2003-01-22
DE10302367A DE10302367A1 (de) 2003-01-22 2003-01-22 Vorrichtung zum Ersetzen des Luftsauerstoffs durch ein Inertgas aus einer laminaren Luftgrenzschicht sowie Verwendung derselben

Publications (3)

Publication Number Publication Date
EP1441192A2 EP1441192A2 (fr) 2004-07-28
EP1441192A3 EP1441192A3 (fr) 2006-05-17
EP1441192B1 true EP1441192B1 (fr) 2008-07-02

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EP03026135A Expired - Lifetime EP1441192B1 (fr) 2003-01-22 2003-11-13 Dispositif pour remplacer, dans une couche limite laminaire d'air, l'oxygène par un gaz inerte, et son utilisation

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US (1) US7431897B2 (fr)
EP (1) EP1441192B1 (fr)
JP (1) JP4417735B2 (fr)
AT (1) ATE399971T1 (fr)
DE (2) DE10302367A1 (fr)

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JP5726653B2 (ja) * 2011-01-28 2015-06-03 富士フイルム株式会社 活性エネルギー線照射装置及び方法、塗布装置、並びに画像形成装置
JPWO2017170949A1 (ja) * 2016-03-30 2019-01-17 京セラ株式会社 光照射装置および印刷装置
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DE19740991A1 (de) * 1997-09-18 1999-03-25 Heraeus Noblelight Gmbh Vorrichtung für die Behandlung einer Materialbahn mit UV-Strahlung
DE19857984B4 (de) 1998-12-16 2007-12-27 Koenig & Bauer Aktiengesellschaft Mit Excimer-Strahlern arbeitender Trockner in Bogendruckmaschinen
DE10050217B4 (de) 2000-10-11 2008-10-02 Volkswagen Ag Polanschlußklemme
DE10050517A1 (de) * 2000-10-11 2002-05-02 Roland Man Druckmasch Einrichtung zum Einwirken auf Bedruckstoffe innerhalb einer Druckmaschine

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ATE399971T1 (de) 2008-07-15
EP1441192A2 (fr) 2004-07-28
JP2004243316A (ja) 2004-09-02
EP1441192A3 (fr) 2006-05-17
DE10302367A1 (de) 2004-08-05
DE50310062D1 (de) 2008-08-14
JP4417735B2 (ja) 2010-02-17
US20040184973A1 (en) 2004-09-23

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