EP0992864B1 - Fixage d'une couche d'encrage - Google Patents

Fixage d'une couche d'encrage Download PDF

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Publication number
EP0992864B1
EP0992864B1 EP19990117814 EP99117814A EP0992864B1 EP 0992864 B1 EP0992864 B1 EP 0992864B1 EP 19990117814 EP19990117814 EP 19990117814 EP 99117814 A EP99117814 A EP 99117814A EP 0992864 B1 EP0992864 B1 EP 0992864B1
Authority
EP
European Patent Office
Prior art keywords
radiation
carrier
infrared
infrared radiation
reflector
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
EP19990117814
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German (de)
English (en)
Other versions
EP0992864A3 (fr
EP0992864A2 (fr
Inventor
Kai K. O. Dr.-Ing. Bär
Rainer Dr.-Ing. Gaus
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.)
Advanced Photonics Technologies AG
Original Assignee
Advanced Photonics Technologies 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
Priority claimed from DE19857044A external-priority patent/DE19857044C2/de
Application filed by Advanced Photonics Technologies AG filed Critical Advanced Photonics Technologies AG
Publication of EP0992864A2 publication Critical patent/EP0992864A2/fr
Publication of EP0992864A3 publication Critical patent/EP0992864A3/fr
Application granted granted Critical
Publication of EP0992864B1 publication Critical patent/EP0992864B1/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
    • G03G15/20—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

Definitions

  • the invention relates to a method and a device for Fixation of a paint job on a sheet-like and / or endless carrier, in particular toner powder on copy paper and / or laser printing paper, wherein the inking is heated, to achieve a permanent connection with the wearer.
  • endless is understood to mean individual sections of the carrier unlike individual leaves without space with others Related sections. The sections can for example, separated from pre-perforated lines become.
  • the invention further relates to the use of a Means for fixing the paint job. At the fixation In particular, crosslinking of the toner also takes place.
  • Carrier can not only be made of ordinary paper, but also made of special paper with resin components, foil and / or any consist of other carrier material.
  • toner powder black or different colored color particles
  • electrophotographic Apply method on copy paper, so that the outlines and possibly the color of the toner powder Color orders correspond to an original image.
  • the toner powder is immediately after its application to the copy paper by electrostatic forces, adhesion and / or by his Weight at the desired location of the copy paper held. Subsequently, the toner powder is fixed by the Copy paper with the toner powder coating through the gap a fixing roller pair is promoted. At least one of the Both fuser rollers are actively heated, that is, by a Heating to a temperature heated and maintained. The Temperature of the roll surface is sufficient to the toner powder to melt and a firm connection of the toner powder with the Effect copying paper.
  • the actively heated contact device by heat radiation and / or by heat conduction and / or by convection heat loses, care must be taken that the device for Applying the paint application and not yet applied Ink application should not be heated. Otherwise the material would the paint job before applying to the sheet-like carrier subjected to a heat treatment, the Application in the desired way prevents or impedes.
  • the operating temperature of the contact device is through their nature and construction limited, with the result that the Working speed or clock rate is limited.
  • Another Reason for a limit of the operating temperature is that the Paper at about the same temperature or even higher Temperature as the toner is heated and that the paper at Exceeding a certain maximum temperature is damaged or destroyed.
  • Object of the present invention is to provide a method and a device for fixing a paint job on a sheet-like and / or endless carrier of the aforementioned Specify type, in its execution or operation one for the Fixing unnecessary heating of device parts and / or the sheet-like carrier is avoidable.
  • An essential idea of the invention is that the Color is irradiated with infrared radiation, so that the Color application by absorption of at least part of the infrared radiation is heated.
  • Device side is proposed to this end, a radiation source for generating infrared radiation to provide and to provide an irradiation area, in which the carrier is einbringbar to there the infrared radiation be exposed so that the paint is heated.
  • An advantage of the invention is that infrared radiation is adjustable and / or controllable that a targeted Heating only for the fixation of the paint job on the Carrier required matter is effected.
  • a targeted warming does not rule out, however, that also areas of Carriers that do not wear paint, desirably miter stiirmt be, for example, the fixation subsequent Prepare process steps or to dry the carrier. It takes place the heating also a cross-linking of the paint job instead.
  • the infrared radiation or its essential, the heating effecting radiation components in the near Infrared becomes the spectral range electromagnetic radiation understood between the visible wavelength range and about 1.4 microns wavelength lies.
  • 80% of the radiant energy is in the Wavelength range from 0.8 to 1.8 ⁇ m.
  • the infrared radiation or its essential, the Heating causing radiation components, in the wavelength range between the visible range and 1.0 micron wavelength lie.
  • the infrared radiation from a radiation source which has an emission temperature of 2500 K. or higher, in particular of 2900 K or higher, may be one higher radiation flux density absorbed by the paint Infrared radiation can be achieved because the emitting Surface of the radiation source Radiation with greater radiance emitted.
  • the near infrared carrier has a small one Absorbency, for example, an absorbance of 0.1 to 0.2, and has the near infrared paint application Absorbency, for example, an absorbance of 0.7 to 0.9.
  • the radiant energy acting on the carrier and the is irradiated thereon color application therefore mainly absorbed by the paint. In this way There is a targeted warming of the paint job.
  • the infrared radiation before hitting spectrally filtered the color application is the filtering such on the absorption properties of the carrier and the Coordinated Farbcitedes that the heating of the carrier negligible is small.
  • a spectral filter for example optical gratings, spectrally selective transparent materials, like glass, and spectrally different refractive materials with suitable shaping, for example prisms, in Question.
  • the Device according to the invention a spectral filter for filtering out of radiation components of the radiation source, wherein the spectral filter between the radiation source and the Irradiation range is arranged.
  • the spectral filter a plate-like, by absorption certain spectral radiation components acting filter, in particular a quartz glass pane.
  • the heating of the paint job by means of infrared radiation in a short time, especially within fractions of a second or a few seconds.
  • an unwanted warm-up the carrier can be effectively avoided, including the flat Shape of the carrier is helpful.
  • finds a significant Heating of the carrier only directly at the interfaces the carrier surface and the paint job instead. A such localized warming may well be desirable to get a firm connection with the paint application.
  • a radiation source emitted infrared radiation effectively for the heating of the Farbrrell to use is that of the radiation source not in the direction of the carrier or the paint job emitted infrared radiation in the direction of the carrier or the Color order is reflected.
  • Device side is this preferably a primary reflector for reflecting the generated Infrared radiation and to concentrate the infrared radiation provided in the irradiation area in which the carrier can be introduced.
  • a secondary reflector for reflecting back radiation components of Infrared radiation, not from the carrier and the paint absorbed and reflected in the direction of the secondary reflector be provided in the direction of the carrier.
  • the device according to the invention has this a back reflector, from the perspective of the radiation source is arranged behind the irradiation area.
  • the Reverse reflector is used for the reflection of radiation emitted by the Radiation source is emitted, in the direction of the carrier.
  • the reflector or the reflectors actively cooled.
  • the reflector or The reflectors have a reflector body with a therein arranged cavity to preferably a liquid cooling of the respective reflector from an inner side of the To allow reflector surface. Due to the cooling is the of The radiation emitted by the reflectors minimizes and thus a good Controllability of the irradiation of the sheet-like carrier or ensured its color order. Furthermore act cooled Reflectors as shields against unwanted warming of device parts involved in the process of heating should not be heated.
  • the cooling especially the Liquid and / or gas cooling is not expediently only used for reflectors, but generally for one Part or more parts of the device that the intensity, Direction and / or wavelength of the radiation source affect emitted infrared radiation.
  • These are in particular also spectral filters and / or radiation-transmissive Envelopes of a radiation source, which inevitably one Heating by absorption of part of it through them subject to radiation passing through.
  • the infrared radiation is spectrally different Absorption properties of the respective partial color order Voted.
  • already fixed parts of the paint job less heated than before unfixed parts, or in the best case not at all more heated.
  • the adaptation of the infrared radiation to the Absorption properties occur in particular by filtering and / or adjusting the emission temperature of a heat radiator.
  • the Infrared lamp for heating the paint application according to the invention is the use an infrared lamp proposed.
  • the Infrared lamp a halogen lamp.
  • the infrared lamp is a tube radiator with a line-like in a radiolucent Tube, preferably in a quartz glass tube, extending Filament is formed.
  • the spectral filter serves the Delimitation of the flow space against the space in which the Irradiation area is located.
  • the device shown in FIG. 1 has two halogen lamps 1 on, each having a filament 2 made of tungsten wire.
  • the Filaments 2 are each along the center line of a arranged quartz glass tube 8 extending perpendicular to the image direction.
  • a primary reflector 4 combined, resulting in constant cross-sectional profile extends parallel to the quartz glass tube 8.
  • Halogen lamp 1 reflects the primary reflector 4 of the halogen lamp 1 not in the direction of an irradiation area emitted infrared radiation in the irradiation area.
  • Fig. 1 In the snapshot shown in Fig. 1 is a Sheet of copy paper 6 in the irradiation area.
  • the copy paper 6 was previously coming from the right into the irradiation area promoted.
  • the device or a with the Device combined copier an applicator roller 10 and an order counter roll 11.
  • the axes of rotation of the applicator roll 10 and the back-counter roller 11 are parallel aligned with each other and positioned so that at opposite rotational movement of the rollers from the top right in Fig. 1 supplied copy paper (feeding direction is with Arrow indicated) of the pair of rollers to the bottom left promoted becomes.
  • a guide member 12 ensures that the copy paper pivoted in a horizontal conveying direction and so in the Irradiation occurs.
  • the applicator roll 10 serves to apply toner powder Copy paper 6, passing through the space between the Application roller 10 and the order counter roller 11 conveyed through becomes.
  • an electrophotographic copying method By a device, not shown, the toner powder applied the applicator roll 10, in accordance with the Font or the image of the original from which a copy is made shall be.
  • the toner powder in the region of the gap to the order counter roll 11 applied to the copy paper 6. Until the entrance to the Irradiation area, the toner powder adheres to the copy paper 6 due to electrostatic forces.
  • the copy paper Upon entering the irradiation area, the copy paper comes 6 on its underside with the surface of a conveyor belt 13 in contact and is surrounded by the endless Movement of the conveyor belt 13 through the irradiation area conveyed through until the front end of the copy paper 6 a Conveyor roller pair 15, 16 reached. At this time, the copy paper 6 supported by a further guide element 14.
  • the copy paper 6 shown in Fig. 1 exemplifies three places on its top toner 7, as described applied by the applicator roll 10 on the copy paper 6 has been. Both the copy paper itself and the toner 7 are shown exaggeratedly thick.
  • the halogen lamps 1 Shortly before the entry of the copy paper 6 in the irradiation area, which is defined approximately by the top of the conveyor belt 13, the halogen lamps 1 are turned on. Due to the low thermal inertia of the filaments 2, the operating temperature of the filaments 2 is reached within fractions of a second after switching on. When the copy paper 6 enters the irradiation area with its leading edge, at least approximately the full radiation power of the halogen lamps 1 is available. Accordingly, the radiation spectrum emitted by the halogen lamps 1 changes only slightly from this point in time until the halogen lamps 1 are switched off. In particular, the circuit flux density of the radiation impinging on the copy paper 6 is more than 300 kW / m 2 . In order to keep the constant operating temperature of about 2900 K at the surface of the filaments 2, the electrical Glühstrom is controlled by the filaments 2.
  • the number of operating hours of the halogen lamps 1 depends crucially on the fact that lamp parts such as the brackets the filaments 2 at their ends and reflector components no exposed to significant thermal cycling. Therefore, the brackets of the filaments and the reflector components preferably actively cooled. These come air cooling and liquid cooling in question.
  • That of the halogen lamps 1 at a filament surface temperature radiation emitted by 2900 K essentially consists of from short-wave infrared radiation. Longer wave shares The emitted radiation will be at least partially absorbed by the quartz glass tubes 8.
  • An additional, in 1 not shown spectral filter can be provided to certain radiation components, which after passing through the Radiation through the quartz glass tubes 8 are still present, filter out. These radiation components are in particular in long-wave infrared radiation components and in radiation components, at the wavelength of the copy paper 6, imprints or already fixed toner of a different color one have a high degree of absorption.
  • the radiation of the Infrared lamps 1 emitted in different directions.
  • One Part of the radiation is directed, for example, directly in the direction of Toner 7 emitted on the copy paper 6 and from the toner. 7 absorbed.
  • Another part of the radiation is going towards the Primary reflector 4 emitted and from this in the direction of Toners 7 reflected.
  • Another part of the radiation is reached directly, or after reflection by the primary reflector 4, places of the copy paper 6, which carry no paint. by virtue of the low degree of absorption of the copy paper 6 for the emitted and optionally filtered radiation these radiation parts substantially from the copy paper reflected.
  • An essential part of the reflected radiation meets the primary reflector 4 or a secondary reflector 5 at the bottom of a reflector body 3, in whose groove-shaped recesses arranged the halogen lamp 1 are, wherein the surfaces of the channel-shaped recesses with a reflective layer are coated or preferably made of polished aluminum, so that the Primary reflector 4 is formed.
  • From the primary reflector 4 or from the secondary reflector 5 is an essential part of incident infrared radiation again in the direction of the copy paper 6 reflected back. There the radiation hits either on the toner 7 or on locations of the copy paper 6, not Wear toner. Accordingly, one part of the impinging radiation continues the reflection chain. In the result becomes the predominant part of the halogen lamps 1 emitted radiation from the toner 7 and absorbed into heat implemented.
  • the radiation area laterally that is, in Direction of the applicator roll 10, in the direction of the conveyor rollers 15, 16 or in directions across the image surface, leave laterally of the irradiation area preferably further Reflectors provided the radiation in the irradiation area Rebound.
  • the Distance of the reflector body 3 to the top of the conveyor belt 13, where the copy paper 6 is located clearly be lower than shown in Fig. 1. Also in this way Radiation losses due to lateral leakage from the Irradiation range can be minimized.
  • Fig. 2 shows a reflector arrangement of such a device. Except the reflector body already described with reference to FIG. 1 3 with the primary reflector 4 and the secondary reflector. 5 the reflector assembly has a total of 4 side reflector body 23, of which due to the sectional view, however only two are shown. The other, not shown side reflector body are located above and below the Image plane of Fig. 2 at the level of the illustrated side reflector body 23.
  • the side reflector body have at their Irradiation space side secondary reflectors 21, the preferably have a surface of polished aluminum.
  • a in the reflector assembly is a remindreflektor restructuring 24 provided with a back reflector 22.
  • the back reflector 22 is on the back of the shown by broken lines directed sheet-like carrier.
  • Reflector arrangement is the through the reflectors 4, 5, 21, 22nd rimmed irradiation room almost completely closed. Therefore, at most slight radiation losses occur Emission of radiation from the irradiation room. All in all is the proportion of radiation that is indirect, d. h., about at least a reflection, starting from the radiation source on the leaf-like carrier or its paint application hits larger as 60% of the emitted radiation.
  • the reflector body 3 has a cavity, not shown on. To the primary reflector 4 and the secondary reflector 5 to Cool, liquid, preferably water, through the Cavity passed. For this purpose, the reflector body 3 an input port 25 for introducing the liquid and an output port 26 for discharging the liquid. The flow direction is indicated in Fig. 2 with arrows.
  • the coolant takes on the inside of the reflectors 4, 5 heat up, which inevitably by absorption a portion of the radiant energy absorbed by the reflectors 4, 5 arises.
  • the conveyor roller pair 15, 16 fulfilled except the Promotion function two more functions.
  • the conveyor roller pair 15, 16 exercises the required Pressure on the heated toner or on the paper out. Furthermore, the conveyor roller pair 15, 16 cools the toner 7 and the copy paper 6 from. Subsequent components of the copier therefore do not have to be temperature resistant.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Resistance Heating (AREA)

Claims (16)

  1. Procédé pour fixer une application de couleur (7) sur un support (6) de type « feuille », en particulier de poudre de toner sur du papier pour photocopie, l'application de couleur (7) étant chauffée de façon à obtenir une liaison permanente avec le support (6),
    caractérisé en ce que
    l'application de couleur (7) est irradiée par radiation infrarouge, si bien que l'application de couleur (7), pour l'essentiel, est chauffée et réticulée par l'absorption d'au moins une partie du rayonnement infrarouge,
    la composante essentielle du rayonnement causant l'échauffement se situant dans l'infrarouge proche, autrement dit entre 0,8 et 1,8 µm.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le rayonnement infrarouge est émis par une source de rayonnement (1) possédant une température d'émission de 2500 K ou plus, en particulier de 2900 K ou plus.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'application de couleur (7) et/ou le support (6) sont choisis de manière telle que leurs propriétés d'absorption se distinguent par leur spectre dans le cas de l'absorption de rayonnements infrarouge et que par le réglage de la distribution spectrale du rayonnement infrarouge rayonné, celui-ci est absorbé principalement par l'application de couleur (7).
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    le spectre du rayonnement infrarouge est filtré avant de parvenir à l'application de couleur (7) et que le filtrage est accordé de manière telle avec les propriétés d'absorption du support (6) et de l'application de couleur (7) que l'échauffement du support (6) est faible et négligeable par rapport à celui de l'application de couleur.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    lors du filtrage, des composantes du rayonnement de longueur d'onde supérieure sont rejetées de façon à minimiser l'échauffement du support (6).
  6. Procédé selon l'une quelconque dés revendications 1 à 5,
    caractérisé en ce que
    des composantes de rayonnement non absorbées, réfléchies, par le support (6) et l'application de couleur (7), sont retournées par réflexion en direction du support (6) ou de l'application de couleur (7).
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    une pluralité de supports de type « feuille » est transportée en succession au travers de la zone de rayonnement dans laquelle se produit l'irradiation par infrarouge et que l'irradiation par infrarouge est démarrée et arrêtée en fonction du transport, en particulier en fonction de la traversé de la zone d'irradiation par un support.
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    une ou plusieurs pièces qui influent sur l'intensité, la direction et/ou la longueur d'onde du rayonnement infrarouge émis par une source de rayonnement (1), incident avec la zone d'irradiation, sont refroidies par du liquide et/ou du gaz.
  9. Procédé selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    l'application de couleur est réticulée par l'irradiation par infrarouge.
  10. Dispositif pour appliquer le procédé selon l'une quelconque des revendications 1 à 9, présentant
    une source de rayonnement (1) pour générer un rayonnement infrarouge, dont les composantes essentielles de rayonnement figurent entre 0,8 et 1,8 µm, et
    une zone d'irradiation dans laquelle le support (6) peut être introduit de façon à y être exposé au rayonnement infrarouge, si bien que l'application de couleur est échauffée et fixée, et
    un réflecteur primaire (4) pour réfléchir le rayonnement infrarouge généré et pour concentrer le rayonnement infrarouge sur la zone d'irradiation, comportant un corps de réflecteur refroidi par un liquide.
  11. Dispositif selon la revendication 10,
    caractérisé par
    un réflecteur secondaire (5) pour retourner par réflexion, en direction du support (6), des composantes de rayonnement du rayonnement infrarouge qui ne sont pas absorbées par le support (6) et l'application de couleur (7) et qui sont réfléchies en direction du réflecteur secondaire (5).
  12. Dispositif selon la revendication 10 ou 11,
    caractérisé en ce que
    les réflecteurs possèdent un corps de réflecteur (3, 23, 24) présentant un espace creux pour le refroidissement par liquide du réflecteur concerné (4, 5, 21, 22) d'un côté intérieur de la surface de réflecteur.
  13. Dispositif selon l'une quelconque des revendications 10 à 12,
    caractérisé par
    un filtre de spectre pour rejeter par filtrage des composantes de rayonnement de la source de rayonnement (1) qui est disposé entre la source de rayonnement (1) et la zone d'irradiation.
  14. Dispositif selon la revendication 13,
    caractérisé en ce que
    le filtre de spectre est un filtre de type « plaque » agissant par absorption de certaines composantes spectrales du rayonnement, en particulier une vitre en verre de quartz.
  15. Dispositif selon l'une quelconque des revendications 10 à 14,
    caractérisé en ce que
    un dispositif de refroidissement par convection forcée est prévu pour refroidir un composant transparent au rayonnement du dispositif au moyen d'un gaz de refroidissement, en particulier pour refroidir le filtre de spectre et/ou une enveloppe entourant un corps incandescent de la source de rayonnement (1).
  16. Dispositif selon l'une quelconque des revendications 10 à 15,
    caractérisé en ce que
    vu de la source de rayonnement (1), un réflecteur en arrière (22) est prévu derrière la zone d'irradiation pour réfléchir des composantes du rayonnement.
EP19990117814 1998-10-09 1999-09-09 Fixage d'une couche d'encrage Expired - Lifetime EP0992864B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19846669 1998-10-09
DE19846669 1998-10-09
DE19857044A DE19857044C2 (de) 1998-10-09 1998-12-10 Farbauftragsfixierung
DE19857044 1998-12-10

Publications (3)

Publication Number Publication Date
EP0992864A2 EP0992864A2 (fr) 2000-04-12
EP0992864A3 EP0992864A3 (fr) 2001-08-16
EP0992864B1 true EP0992864B1 (fr) 2005-06-29

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Application Number Title Priority Date Filing Date
EP19990117814 Expired - Lifetime EP0992864B1 (fr) 1998-10-09 1999-09-09 Fixage d'une couche d'encrage

Country Status (2)

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EP (1) EP0992864B1 (fr)
DE (1) DE29823683U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10038896B4 (de) * 2000-08-09 2004-09-30 Advanced Photonics Technologies Ag Verfahren und Vorrichtung zur thermischen Fixierung von Laserdrucken
DE10064561A1 (de) * 2000-12-22 2002-06-27 Nexpress Solutions Llc Fixiervorrichtung zum Fixieren von Tonermaterial
DE10114526B4 (de) * 2001-03-22 2005-04-07 Schott Ag Verfahren und Vorrichtung zum Erwärmen und Fixieren eines Farbauftrages, insbesondere eines Tonerpulvers auf einem plattenförmigen Träger

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355225A (en) * 1981-03-30 1982-10-19 Xerox Corporation Instant-on radiant fuser
JPS57165853A (en) * 1981-04-04 1982-10-13 Ricoh Co Ltd Fixing method for electronic photographic offset printing plate
JPH01183679A (ja) * 1988-01-18 1989-07-21 Nec Corp 電子写真式印字装置の定着器

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Publication number Publication date
DE29823683U1 (de) 1999-09-30
EP0992864A3 (fr) 2001-08-16
EP0992864A2 (fr) 2000-04-12

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