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EP1217467B1 - Méthode d'impression et/ou revêtement recto-verso d'un substrat - Google Patents

Méthode d'impression et/ou revêtement recto-verso d'un substrat Download PDF

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Publication number
EP1217467B1
EP1217467B1 EP01127118A EP01127118A EP1217467B1 EP 1217467 B1 EP1217467 B1 EP 1217467B1 EP 01127118 A EP01127118 A EP 01127118A EP 01127118 A EP01127118 A EP 01127118A EP 1217467 B1 EP1217467 B1 EP 1217467B1
Authority
EP
European Patent Office
Prior art keywords
toner
substrate
glass transition
image
transition temperature
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
Application number
EP01127118A
Other languages
German (de)
English (en)
Other versions
EP1217467A3 (fr
EP1217467A2 (fr
Inventor
Domingo Rohde
Detlef Schulze-Hagenest
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1217467A2 publication Critical patent/EP1217467A2/fr
Publication of EP1217467A3 publication Critical patent/EP1217467A3/fr
Application granted granted Critical
Publication of EP1217467B1 publication Critical patent/EP1217467B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/238—Arrangements for copying on both sides of a recording or image-receiving material using more than one reusable electrographic recording member, e.g. single pass duplex copiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2007—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using radiant heat, e.g. infrared lamps, microwave heaters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2098—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using light, e.g. UV photohardening
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00016—Special arrangement of entire apparatus
    • G03G2215/00021—Plural substantially independent image forming units in cooperation, e.g. for duplex, colour or high-speed simplex
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/207—Type of toner image to be fixed 
    • G03G2215/2083—Type of toner image to be fixed  duplex

Definitions

  • the invention relates to a method for double-sided printing and / or coating of a substrate, in particular of paper or cardboard, using at least one toner, according to claim 1.
  • One known method is electrostatic printing, in which a latent electrostatic image is developed by charged toner particles. These are transferred to an image-receiving substrate, hereinafter referred to as substrate. Subsequently, the developed and transferred to the substrate image is fixed by the toner particles are heated and melted. Melting of the toner particles often employs contacting processes in which the toner particles are brought into contact with appropriate equipment, such as hot rollers or rollers.
  • appropriate equipment such as hot rollers or rollers.
  • the disadvantage is that, as a rule, the use of silicone oil as release agent is required, which is intended to prevent adhesion of the melted toner to the heating device.
  • the structure, maintenance and operating costs of these touching working heaters are complex and thus costly. Furthermore, the error rate caused by the contacting heaters is relatively high.
  • non-contact heating devices and methods are also known in which the toner particles are melted, for example by means of heat / microwave radiation or hot air.
  • toners are used whose glass transition temperature (T G ) is in a range of 45 ° C to 75 ° C.
  • T G glass transition temperature
  • the glass transition temperature at which the toner, starting from the solid state, begins to soften is influenced by the choice of raw materials and by the addition of certain additives to the toner.
  • the lower value of the temperature range within which the glass transition point lies is limited downwardly by the storage conditions of the toner and the heat generated in the printer, particularly within the development station, and upwardly by the reflow and fix conditions. In a melter for the toner, both the toner and the substrate itself are heated.
  • the surface temperature of the substrate In order to ensure a good fixation of the toner on the substrate, the surface temperature of the substrate must be in the range of the glass transition temperature of the toner or above. The toner reaches or exceeds the glass transition temperature (T G ) already in the region of the melting device.
  • the US5672452 has a method and apparatus for double-sided printing a substrate using toner containing polymerizable monomers and a wax such that during the first fusing pass, the wax over the image on the first face is smeared, causing fouling, such as through Oil-preventing and fixing the second side easier.
  • the substrate is automatically turned, returned to the beginning of the processing path, and returned to the transfer device and the fuser where the other side of the substrate is printed.
  • the substrate, the image already fixed on the substrate back and the image to be fixed are heated.
  • the second heating undesirably affects the print quality, especially the gloss of the already fixed image on the first page.
  • Repeated heating of the substrate may alter the gloss at individual locations or over the entire substrate side.
  • the gloss value of the second substrate side is greater than on the first substrate side.
  • the toner already fixed on the first substrate side tends to smear upon heating the second substrate side to a temperature higher than the glass transition point of the toner. Reflowing of the already fixed toner on the first substrate side leads to errors in the printed image and fouling of a transport device guiding the substrate along the processing path through the smeared toner.
  • the substrate may stick to the transport device.
  • the same problems also occur in a device in which two complete printing units, each having a toner transfer device and a melting device.
  • a first image is transferred from a first printing unit to a first side of the substrate and fixed, while subsequently a second image is transferred and fixed on the back of the substrate by means of the second printing unit.
  • Substrate such as a paper sheet or a paper web, using at least one liquid or dry, at least one polymer having toner initially at least one toner layer or a first, at least one toner layer having image is transferred to a first side of the substrate. Then, this toner is heated to its glass transition temperature (T G ) or an overlying temperature. In this case, the toner or the toner layers is preferably melted so far that sets a certain gloss. This condition of the toner is then frozen by fixing the toner on the substrate, for example by means of ultraviolet rays.
  • the toner in the form of single molecules has the property that its original glass transition temperature shifts to a higher temperature level due to crosslinking of its polymer chains and the viscosity of the toner increases.
  • the toner after the toner has first been heated and crosslinked and cooled down to its glass transition point or beyond, its glass transition temperature increases, so that upon reheating, this toner softens only at a higher temperature-starting from the solid state.
  • the crosslinking process raises the glass transition temperature and the viscosity of the toner, and upon reheating above its new glass transition point, the toner no longer becomes liquid, but acquires a thermoplastic, rubbery structure.
  • at least one toner layer or a second image having at least one toner layer is transferred to the other, second substrate side.
  • the toner on the second substrate side is then heated to a temperature equal to or greater than its own glass transition temperature.
  • the toner already fixed on the first substrate side can no longer become liquid, but remains highly viscous when heated above its new glass transition point, it can be ensured that the toner applied and fixed on the first substrate side is fixed by fixing the toner the other, second substrate side is not smeared on its base, for example a conveyor belt or a roll, and / or experiences a gloss change.
  • the temperature of the first substrate side and the toner fixed thereon, which sets when heating the second substrate side for fixing the second toner image may also be above the new glass transition point of the first toner image, as long as the first toner image thereby is not affected. Due to the fact that the toner located on the first substrate side no longer becomes liquid upon renewed heating, smearing and thus contamination of the printing and / or coating machine and / or the copier, in which the method according to the invention finds application, can be achieved by the on the first substrate side applied and fixed toner can be avoided.
  • a further advantage is that the quality, in particular the gloss of the image applied to the first substrate side or the coating remains the same and does not change during printing or coating of the second substrate side.
  • the glass transition temperature of the toner increases due to the crosslinking of the polymer chains by 10 ° C to 20 ° C and at the same time increases the viscosity of the toner. Above the glass transition point, the toner no longer becomes liquid on renewed heating, but - as said - gets a thermoplastic, rubber-like structure.
  • additives for controlling the melt flow, the surface quality, the toner charge, the powder flow and optionally further additives are mixed into the toner.
  • the raw material of this toner is mixed together and, for example, melt-kneaded in a heated two-roll mill.
  • the cooled extrudate is ground to a particle size ⁇ 3 mm and then introduced into a jet mill which further comminutes it.
  • the fine toner particles are sorted, wherein for the toner used in the process according to the invention preferably particles having an average particle size of about 8 microns are used.
  • the melting of the toner for the purpose of fixing it on its substrate is carried out at a surface temperature of about 70 ° C to 120 ° C, in which the curing of the toner as a result of crosslinking of the polymer chains is carried out under irradiation of the molten toner with ultraviolet light.
  • the glass transition temperature of the toner rises by more than 10 ° C. and also its viscosity.
  • the realizable melting and fixing process reference is made to the publication " UV-cured toners for printing and coating on paper-like substrates "by Detlef Schulze-Hagenest and Paul HG Binda, IS & T 13th International Congr. Adv. I Non-Impact Printing Technologies, 1997 , the contents of which are the subject of this application.
  • the substrate is paper, cardboard or the like
  • its first side may be the front side and its second side may be the back side.
  • the first substrate side is the back side and the second substrate side is the front side of the paper.
  • whether the front or the back of the paper is printed first is arbitrary.
  • the fixing of the toner takes place without contact.
  • a known dry oven, heat and / or microwave jets and / or hot air or the like can be used.
  • the toner is fixed exclusively with the aid of ultraviolet rays, that is to say crosslinked in the molten state.
  • the melting of the toner can be done here, for example, with the help or only by infrared rays, hot air, microwaves and / or the like.
  • an embodiment of the method is preferred, which is characterized in that a plurality of toners with different colors on at least one of Substrate sides are applied.
  • the image applied to a substrate side thus has several colors, for example black, cyan, magenta, yellow and / or a mixed color.
  • the glass transition point of each of the toners after initial heating and fixing of the toner increases, for example by up to 10 ° C. or above.
  • the properties of the toner change, which, when reheated to its now new glass transition temperature or above, no longer becomes liquid, but gets a thermoplastic, rubber-like structure. This can ensure that when printing or coating the second substrate side of the already fixed on the first substrate side toner is not liquid again.
  • toners of different colors can be transferred and fixed onto the substrate to form the image or coating.
  • coating is understood to mean a thin layer formed by at least one toner. A “coating” can therefore also have a plurality of differently colored toners, so that the coating can also be multicolored.
  • an embodiment of the method is preferred, which is characterized in that the toners are first all transferred to the respective substrate side to produce a coating or image and then heated and fixed together. On each of the two sides of the substrate so only one fixing is carried out in each case.
  • a plurality of fixing operations for producing the image or coating are performed on at least one of the substrate sides. For example, after each transfer of a toner layer to a substrate side, it can be fixed directly thereafter on the substrate, in which case the next toner layer is then applied to the substrate in a subsequent step, which in turn is fixed immediately thereafter.
  • first two toner layers are applied to a substrate side, which are then melted and fixed together, wherein in a subsequent process step on the same substrate side another toner layer is transferred to the already fixed toner layers, which then in a subsequent separate fixing with the Substrate is connected.
  • the method according to the invention can be used in conjunction with a digital printing machine, that is to say a machine which operates, for example, according to the electrographic or electrophotographic process.
  • the method can basically be used wherever a substrate is coated with the aid of at least one toner or an image is transferred to a substrate and fixed there. So the press can also be a copier.
  • Figure 1 shows a schematic representation of a section of a first embodiment of a machine 1 for double-sided printing and / or coating of substrates.
  • the substrates are paper sheets which are imaged and / or coated on their front and back sides.
  • at least one curable toner is transferred to the substrate, heated above its glass transition temperature and then fixed on the substrate by exposure to UV rays.
  • a first image is applied to a first side of the paper sheet by means of the machine 1 and a second image to the second side of the paper sheet.
  • the machine 1 comprises a first printing unit 3 for producing a first image on the first side of the paper sheet, for example the front side, and a second printing unit 5 for printing on the second side of the paper sheet. Between the printing units 3, 5, a turning device 7 is provided for the successive in the transport direction and optionally spaced apart paper sheets, whose function will be discussed in more detail.
  • the structure and the function of the first and second printing units 3, 5 is identical in this embodiment, so that in the following only the first printing unit 3 will be described in more detail.
  • the first printing unit 3 comprises a first transport device 9 for the paper sheets, which is arranged downstream of a second transport device 11 in the sheet transport direction.
  • the Transport devices 9, 11 each have at least two deflection rollers, over which at least one endless conveyor belt 13 or 15 is guided.
  • a guide element 17 is arranged in the transfer area between the transport devices.
  • a plurality of image forming and transfer devices 19A, 19B, 19C and 19D are arranged in this embodiment, each for transferring a toner or a toner layer of different color on one on the conveyor belt 13 and past the image forming and transfer devices 19 Paper sheet is used. After all the toner layers have been transferred to the first side of the paper sheet, the first image is completely developed on the paper sheet by means of the toner and can now be fixed on the paper sheet in a subsequent processing step.
  • a heating device 21 is provided above the second transport device 11, which acts on the paper sheet with the toner particles thereon with infrared rays, hot air and / or microwaves or the like and this heated above its glass transition temperature T G.
  • the heating device 21 is followed by a curing device 23, which in this embodiment has a lamp 25 which is surrounded by a reflector 27.
  • the lamp 25 acts on the image to be fixed with ultraviolet rays, due to which the polymer chains of the molten toner crosslink. Crosslinking increases the glass transition temperature and the viscosity of the toner.
  • the curing device 23 is followed by a cooling unit 29 which cools the paper sheet and the image fixed thereon. Subsequently, the paper sheet is transferred to the turning device 7, which turns the paper sheet and transferred to the subsequent second printing unit 5.
  • turning the paper sheet is meant that the position of the top and bottom of the paper sheet is exchanged, so that now in the subsequent second printing unit 5, the second side of the paper sheet, during the passage through the first printing unit 3 on the conveyor belts 13, 15 of the transport devices 9, 11 applied, now rests on top and can be printed.
  • the printing process taking place in the second printing unit 5 is identical to the printing process described with reference to the preceding first printing unit 3, so that reference is made to the preceding explanations.
  • FIG. 2 shows a further exemplary embodiment of the machine 1. Identical parts are provided with the same reference symbols, so that reference is made to the description relating to FIG. The following section deals only with the differences.
  • the machine 1 has only a single printing unit 3, with which both the front side and the back side of the paper sheets are printed. As indicated by an arrow 31, an unillustrated paper sheet is transferred to the printing unit 3, in which first on the conveyor belts 13, 15 uppermost resting, first side of the paper sheet is printed with a first image. At the end of the printing unit 3, the paper sheet printed on one side-as indicated by an arrow 33-is directed to a return region 35, which here is located below the first and second transport devices 9, 11 purely by way of example.
  • a third transport device 37, the turning device 7 and a fourth transport device 39 are arranged.
  • the one-sided printed paper sheet is transferred from the third transport means 37 to the turning device 7, with the aid of which the position of the top and bottom of the sheet is exchanged.
  • the paper sheet is then continued to the fourth transport device 39.
  • the first page of the paper sheet is thus on top of the conveyor belt of the transport device 11, on the conveyor belt of the transport device 37 below and on the conveyor belt of the third transport device 39.
  • the paper sheet arrives at the beginning of the printing unit 3 and is transferred to the first transport device 9.
  • the paper sheet now passes through the printing unit 3 a second time, the second side of the paper sheet now lying on top of the conveyor belt 13 and being printed with an image. After the paper sheet has left the printing unit 3 for the second time, it is led out of the "transport and treatment loop" of the printing unit 3, as indicated by an arrow 43.
  • the exemplary embodiments of the machine 1 illustrated in FIGS. 1 and 2 have in common that either the front side of the paper sheet and then the rear side of it, or the first in a first processing step, the back of the paper sheet and only then the front side is printed. Furthermore, it is provided in an advantageous embodiment, not shown, that the paper sheets, after the first page has been printed, a certain period of time are cached in a memory unit. That is, the printing of the second sheet of paper page is not done here immediately after printing the first sheet of paper page, as in the embodiments of Figures 1 and 2.
  • the turning device 7 may upstream of the memory unit - or be zusehnachach in paper transport direction.
  • the image forming and transferring devices 19A to 19D may each be formed so that the toner is transferred directly from a photoconductor, not shown, for example, from an electrographic or electrophotographic image cylinder to the paper. Alternatively, it is possible that the toner is first transferred to an intermediate transfer device and only then from this to the paper.
  • the intermediate transfer device can be used as a transfer device for only one color or for all colors. Thus, it is possible that an intermediate transfer device is provided for each color or for each toner.
  • the toner used in the machine 1 may be dry or liquid. If liquid toner is used, the carrier liquid for the toner may be organic or inorganic liquid.
  • the curing device 23 does not continuously apply ultraviolet light to the molten toner, but that it emits flashes of light whose UV radiation emission is sufficiently high to ensure a desired crosslinking of the polymer chains of the toner or the toners.
  • heat radiation or a combination of melting and curing of the toner with the aid of heat can also be used to cure the toner.
  • the inventive method is evident from the description of Figures 1 and 2 readily. It is that the printing or coating of the front and back of the substrate takes place in two independent processing steps.
  • the first processing step the at least one toner layer or the first image is transferred to a first side of the substrate. Thereafter, the toner is heated to its glass transition temperature or an overlying temperature and starts to melt.
  • the toner is heated to its glass transition temperature or an overlying temperature and starts to melt.
  • the polymer chains of the toner begin to crosslink and become longer.
  • the initial glass transition point of the toner changes due to the crosslinking of its polymer chains to increase, that is, larger than before the first-time fusing and curing.
  • At least one toner layer or a second image is transferred to the second side of the substrate, then heated to a temperature equal to or greater than the glass transition temperature of the toner.
  • the second toner image By heating the second toner image to its glass transition temperature located on the first substrate side, already fixed toner image are heated to a temperature which is readily above the new glass transition temperature of the toner located on the first substrate side. Smearing of the fixed on the first substrate side toner on a substrate, such as a conveyor belt or roll, due to relative movement between the substrate and the substrate can still be excluded because the first toner image due to the crosslinking of its toner material even when heated above its glass transition temperature not gets more fluid, but gets a rubbery structure.
  • the first image on the first substrate side is not influenced by the second printing process, so that the image quality, in particular the gloss of the first image is preferably not influenced by the printing of the second substrate side, or at least to a very limited extent.
  • liquid toner which is in or dissolved in an organic or inorganic liquid can also be used for the process according to the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Printing Methods (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)

Claims (8)

  1. Procédé d'impression et/ou d'enduction des deux faces d'un substrat, notamment en papier ou en carton, en utilisant au moins un toner sec comprenant au moins un polymère où au moins une couche de toner ou une première image comprenant au moins une couche de toner est transférée sur une première face du substrat et où le toner est échauffé à sa température de transition vitreuse ou à une température supérieure à cette dernière de façon à être fixé sur le substrat et où au moins une couche de toner ou une deuxième image comprenant au moins une couche de toner est transférée sur la deuxième face du substrat, le toner se trouvant sur cette deuxième face du substrat étant échauffé à une température supérieure ou égale à la température de transition vitreuse,
    caractérisé en ce que
    le toner utilisé à cet effet est un toner sec, pulvérulent et réticulant exclusivement sous l'effet du rayonnement de lumière ultraviolette, la température de transition vitreuse de ce toner se situant dans une plage comprise entre 45 °C et 75 °C et dont sa température de verre étant décalée, après son premier réchauffement, d'environ 10 °C à 20 °C au-dessus de sa température de transition vitreuse initiale, avec réticulation consécutive du toner, de sorte que la valeur inférieure de sa nouvelle température de transition vitreuse se situe dans la plage comprise entre 55 °C et 65 °C ou supérieure et que la viscosité du toner augmente, sous l'effet du processus de réticulation, de sorte que le toner présente, après son nouveau réchauffement à une température supérieure à sa nouvelle température de transition vitreuse, une structure thermoplastique similaire à celle du caoutchouc mais sans devenir liquide.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le toner est refroidi après sa fixation sur le substrat.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    le substrat est entreposé, après transfert, réchauffement et fixation et éventuellement après refroidissement de la ou des enduits ou de la première image sur la première face du substrat, pendant un certain temps avant d'appliquer un enduit ou la deuxième image sur la deuxième face du substrat.
  4. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    plusieurs, de préférence jusqu'à sept et notamment quatre toners de couleurs différentes sont appliqués sur au moins l'une des faces du substrat.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    tous les toners sont d'abord appliqués sur la face respective du substrat et ensuite échauffés et fixés en commun.
  6. Procédé selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    plusieurs opérations de fixation sont réalisées sur au moins l'une des faces du substrat pour produire l'image ou l'enduit.
  7. Procédé selon la revendication 6,
    caractérisé en ce que
    chaque couche de toner transférée sur une face du substrat est fixée immédiatement après ce transfert sur le substrat et que la prochaine couche de toner est transférée, dans une étape consécutive, sur le substrat ou bien sur la couche de toner préalablement fixée, puis fixée.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le rayonnement UV est cadencé pour générer des flashes de lumière UV.
EP01127118A 2000-12-22 2001-11-15 Méthode d'impression et/ou revêtement recto-verso d'un substrat Expired - Lifetime EP1217467B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10064560A DE10064560A1 (de) 2000-12-22 2000-12-22 Verfahren zum doppelseitigen Bedrucken und/oder Beschichten eines Substrats
DE10064560 2000-12-22

Publications (3)

Publication Number Publication Date
EP1217467A2 EP1217467A2 (fr) 2002-06-26
EP1217467A3 EP1217467A3 (fr) 2006-03-15
EP1217467B1 true EP1217467B1 (fr) 2008-01-09

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EP01127118A Expired - Lifetime EP1217467B1 (fr) 2000-12-22 2001-11-15 Méthode d'impression et/ou revêtement recto-verso d'un substrat

Country Status (4)

Country Link
US (1) US6535711B2 (fr)
EP (1) EP1217467B1 (fr)
JP (1) JP2002251085A (fr)
DE (2) DE10064560A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064552B4 (de) * 2000-12-22 2004-10-07 Nexpress Solutions Llc Verfahren und Maschine zum Bedrucken und/oder Beschichten eines Substrats
US6713222B2 (en) * 2002-02-28 2004-03-30 Xerox Corporation Curing processes
JP2003295688A (ja) * 2002-04-04 2003-10-15 Canon Inc 画像形成装置
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EP1217467A2 (fr) 2002-06-26
JP2002251085A (ja) 2002-09-06
US6535711B2 (en) 2003-03-18
DE50113470D1 (de) 2008-02-21
DE10064560A1 (de) 2002-06-27
US20020141791A1 (en) 2002-10-03

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