EP1766479A2 - Vorrichtung und verfahren zur entwicklung von zuvor auf einem potentialbildträger erzeugten die zu druckenden bilder enthaltenden potentialbilder bei einer elektrografischen druck- oder kopiereinrichtung - Google Patents
Vorrichtung und verfahren zur entwicklung von zuvor auf einem potentialbildträger erzeugten die zu druckenden bilder enthaltenden potentialbilder bei einer elektrografischen druck- oder kopiereinrichtungInfo
- Publication number
- EP1766479A2 EP1766479A2 EP05775114A EP05775114A EP1766479A2 EP 1766479 A2 EP1766479 A2 EP 1766479A2 EP 05775114 A EP05775114 A EP 05775114A EP 05775114 A EP05775114 A EP 05775114A EP 1766479 A2 EP1766479 A2 EP 1766479A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- potential
- liquid
- carrier
- developer
- liquid developer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/12—Developers with toner particles in liquid developer mixtures
-
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
- G03G15/104—Preparing, mixing, transporting or dispensing developer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/12—Developers with toner particles in liquid developer mixtures
- G03G9/125—Developers with toner particles in liquid developer mixtures characterised by the liquid
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/12—Developers with toner particles in liquid developer mixtures
- G03G9/13—Developers with toner particles in liquid developer mixtures characterised by polymer components
- G03G9/131—Developers with toner particles in liquid developer mixtures characterised by polymer components obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- G03G2215/06—Developing structures, details
- G03G2215/0602—Developer
-
- 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
- G03G2215/06—Developing structures, details
- G03G2215/0602—Developer
- G03G2215/0626—Developer liquid type (at developing position)
-
- 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
- G03G2215/06—Developing structures, details
- G03G2215/0634—Developing device
- G03G2215/0658—Liquid developer devices
Definitions
- a recording medium e.g. a single sheet or a ribbon-shaped Auf ⁇ drawing support of various materials, e.g. Paper or thin plastic or metal foils
- a potential image carrier e.g. a photoconductor
- potential images charge images
- image areas areas to be colored (referred to below as image areas) of the potential images are made visible by toner using a developer station (inking station). Subsequently, the toner image is transferred to the recording medium.
- dry toner or toner-containing liquid developer can be used.
- a method for electrophoretic liquid development (electrographic development) in digital printing systems is known, for example, from EP 0 756 213 B1 or EP 0 727 720 B1.
- the method described there is also known by the name HVT (High Viscosity Technology).
- the liquid developer used is a silicone oil-containing carrier liquid with color particles (toner particles) dispersed therein.
- the toner particles typically have a particle size of less than 1 micron. Further details can be taken from EP 0 756 213 B1 or EP 0 727 720 B1, which are part of the disclosure of the present application.
- electrophoretic liquid development processes of the type mentioned with silicone oil as the carrier liquid with toner particles dispersed therein are described, and also a developer station comprising one or more application rollers for wetting the potential Image carrier with liquid developer corresponding to the Potential ⁇ images on the potential image carrier.
- a developer station comprising one or more application rollers for wetting the potential Image carrier with liquid developer corresponding to the Potential ⁇ images on the potential image carrier.
- transfer elements eg rollers or belts
- a liquid developer is used with a carrier liquid (e.g., silicone oil) and toner particles dispersed therein.
- the liquid developer has a viscosity of 100-10000 mPa * s. This high viscosity is necessary in order to allow a high proportion of toner particles in the liquid developer, since only then is it possible to achieve sufficient coloring of potential images on the potential image carrier.
- the high viscosity of the liquid developer has the disadvantage that the toner particles move relatively slowly in the carrier liquid.
- a liquid developer of a curable liquid binder and colorant The binder should have a viscosity of not more than 500 mPa * s and a resistivity of not less than 10 8 ⁇ cm. Furthermore, the binder should comprise at least about 80% by weight of the liquid constituent of the developer. In contrast to the method cited above, here the binder has to be cured in order to firmly bond the colorants to a recording medium.
- a disadvantage of this liquid developer is the fact that the mobility of the colorants in the binder is relatively small and thus the printing speed is correspondingly low.
- the problem to be solved by the invention is to specify a device and a method with which a potential image carrier of such liquid developers is supplied, such that a constant coloration of the there present Image-containing potential images at high Druckge ⁇ speed is achieved.
- the entirety of carrier liquid and toner particles is designed such that the liquid developer has a low viscosity. This can still be favorably influenced by the fact that dispersion-promoting additives are added.
- the liquid developer has a viscosity of 1-99 mPa * s. Then, the mobility of the toner particles in the carrier liquid is large, so that during the residence time of the toner particles in the developer gap almost all toner particles in the areas of the image locations of the potential images are transferred to the potential image carrier.
- a further advantage is the fact that only one carrier liquid, that is to say no separating liquid, is used. This avoids contamination of the circulating liquid developer in the developer station and possibly used Cleaning stations. The reusability of the Suflüs ⁇ stechnik in the cyclic process is thus increased.
- a carrier liquid that meets these requirements may be silicone oil.
- the silicone oil may consist of polydimethylsiloxane.
- a non-volatile liquid is selected as the carrier liquid, pollution of the environment is avoided.
- pollution of the environment is avoided.
- a volatile carrier liquid is subjected to a treatment before or after the printing process in such a way that it does not become volatile.
- This can e.g. be achieved by the carrier liquid is irradiated with UV light.
- a UV curable liquid is e.g. Acrylic ester.
- a further possibility of such a treatment can be provided by additional substances which convert the image on the recording medium in such a way that no volatile substances can remain in or escape from it, e.g. by polycondensation over moisture, e.g. from the air.
- the proportion of toner particles in the developer liquid should be selected between 10-55% by weight and the average of the volume-weighted diameter distribution of the toner particles in the range of 0, 1 to 5 microns, preferably 0.5 to 2 microns, are.
- the applicator roller can be arranged in such a way as to form the potential image carrier such that a developer gap between applicator roller and potential image carrier is formed, which has a layer thickness filled with liquid developer of 1- 20 microns.
- spacer elements Another possibility for determining the layer thickness of the developer gap between applicator roller and potential carrier is the arrangement of spacer elements.
- spacer rings can be arranged on the applicator roller which are in contact with the potential image carrier.
- prismatic sliding elements can be arranged, which are in contact with the potential image carrier.
- air bearings between the applicator roller and potential image carrier can be provided as spacers.
- the developer gap and the liquid developer are selected in this way, the toner particles dispersed in the liquid developer in the region of the image sites of the potential images will be transferred completely or almost completely to the potential image carrier, and only small amounts of toner will be transferred in the areas without image areas.
- the directions of movement of the surfaces of the potential image carrier and applicator roller can be the same or opposite in coloration, they can run with the same or different surface speeds.
- the transition of the colored potential images from the potential image carrier onto an intermediate carrier and / or recording medium can take place in mechanical contact between potential carrier and intermediate carrier / recording medium.
- a raster roll adjacent to the applicator roll, which roll lies adjacent to a chamber doctor blade, which feeds the liquid developer to the raster roll.
- the screening of the anilox roller can then influence the amount of the liquid developer conveyed.
- the anilox roller can have a screening which makes it possible to convey a volume of liquid developer from 1 to 40 cm 3 / m 2 (based on the roll surface), preferably 5 to 20 cm 3 / m 2 .
- FIG. 1 shows a schematic representation of a printing or copying device with which liquid development can be carried out
- FIG. 2 shows a first embodiment of a developer station
- FIG. 3 shows a second embodiment of a developer station.
- FIG. 1 shows a basic representation of an electrographic printing module PM.
- a potential image carrier 101 e.g. a photoconductor drum, a Löschbe ⁇ exposure 102 exposed.
- the charging of the potential image carrier 101 in a station 103 is performed.
- Potential image carriers 101 are generated by imagewise exposure in the station 104 potential images with image locations of images to be printed. These potential images are colored in a developer station 200 by a liquid developer having the abovementioned properties.
- liquid developer is taken from a developer supply 203 and fed to a request roller 202.
- the application roller 202 för- then changes the liquid developer to an applicator roller 201 and this to the potential image carrier 101. Subsequently, the applicator roller 201 is cleaned in the cleaning station 204.
- toner particles migrate into the potential image carrier 101 in the areas which imprint the image areas and leave there, whereas in the non-image areas there is virtually no transfer of toner particles to the potential image carrier 101 instead of.
- the colored potential images are transferred to a recording medium 402.
- a counterpressure roller 401 is used.
- the intermediate carrier 301 can also be cleaned by means of an intermediate carrier cleaning 302.
- the recording medium 402 is finally fed to a fixing station.
- the toner images in known Wei ⁇ se, for. fixed by pressure and / or heat.
- FIG. 2 A first implementation of a developer station 200 without a potential image carrier 101 is shown in FIG. 2.
- the liquid developer is contained in a storage container 205.
- a storage container 205 With the aid of scoop rollers 206 and 207, liquid developer is fed to an anilox roller 208.
- the anilox roller 208 which is provided with a raster on the surface, takes over from the scoop roller 207 liquid developer.
- a squeegee 209 rests on the webs of the anilox roller 208 and thereby removes excess
- the anilox roller 208 transfers the liquid developer to the applicator roller 201, which guides the liquid developer to the potential image carrier 101 for coloring the potential images. Subsequently, the applicator roller 201 is replaced by a
- FIG. 3 A second implementation of the developer station 200 without a potential image carrier 101 is shown in FIG. 3.
- a chamber belt 212 is used to supply liquid developer to the anilox roller 208.
- the further transport of the liquid developer to the potential image carrier 101 corresponds to FIG. 2.
- the chambered doctor blade 201 is known for offset printing from Kipphan, Handbuch der Printmedien, Springer Verlag, 2000. Their use for electrophoretic digital printing is proposed according to FIG.
- the chamber doctor blade 212 is a seated on the peripheral surface of the Ras ⁇ terwalze 208 chamber 214 which is sealed by two squeegees, the squeegee Rl seen at the entrance of the chamber 214 in the direction of rotation of the anilox roller 208, the metering blade R2 at the outlet of the chamber 214 in the direction of rotation Anilox roller 208 seen, and two seals for sealing to the lateral edge of the anilox roller 208 (not visible in Figure 3).
- the supply of the liquid developer into the chamber 214 of the chamber doctor blade 212 can preferably take place through one or more inlet openings via pumps.
- the removal of the liquid developer from the chamber 214 for example, advantageously for better skillsmi ⁇ tion of the liquid developer, and the emptying of the chamber 214 can either suc ⁇ gen via inlet or outlet openings.
- the advantage of the chambered doctor blade 212 is particularly seen in that this can be arranged largely freely along the circumference of the anilox roller 208, so that the roller roller 208 can accordingly be arranged on the circumference of the applicator roller 201 at different positions.
- the position of the chamber doctor blade 212 to the anilox roller 208 is determined by the fact that the metering blade R2 should lie below the surface of the liquid developer in the chamber 214, this can be achieved by gravity according to the position of the chamber doctor blade 212 or by overpressure in the chamber 214 ,
- the screen roller 208 is adapted in its screening to För ⁇ tion of a volume of liquid developer of 1 to 40 cm 3 / m 2 (based on the roll surface), preferably 5-20 cm 3 / m 2 .
- the promotion of liquid developer is also area-related and thus independent of the printing speed, i. At different printing speeds, the same amount of liquid developer per unit area can always be supplied to the applicator roller 201.
- the applicator roller 201 leads the liquid developer with the properties described above to the potential image carrier 101.
- the image areas of the potential images present on the potential image carrier 101 are then colored by the toner particles contained in the liquid developer.
- the transition takes place in a developer gap 213 between applicator roller 201 and potential image carrier 101 whose layer thickness is e.g. can be influenced by the Ober ⁇ surface material of the applicator roll 201 and the properties of the liquid developer.
- the developer gap 213 and its length are selected such that the toner particles of the liquid developer color the image locations of the potential images well. This result can be favorably influenced by using an additional electric field between the applicator roller 201 and the potential image carrier 101.
- An optimum composition of the liquid developer is the following: viscosity of the liquid developer: 1-99 mPa * s;
- Viscosity of the carrier liquid 0.1-80 mPa * s;
- Toner content 10- 55%; Toner diameter: average value of the volume weights diameter distribution of the toner particles in the range of 0.1-5 ⁇ m.
- Layer thickness in the developer gap 1-20 ⁇ m.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Liquid Developers In Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004032922A DE102004032922A1 (de) | 2004-07-07 | 2004-07-07 | Vorrichtung und Verfahren zur Entwicklung von zuvor auf einem Potentialbildträger erzeugten die zu druckenden Bilder enthaltenden Potentialbildern bei einer elektrografischen Druck- oder Kopiereinrichtung |
PCT/EP2005/007101 WO2006002941A2 (de) | 2004-07-07 | 2005-07-01 | Vorrichtung und verfahren zur entwicklung von zuvor auf einem potentialbildträger erzeugten die zu druckenden bilder enthaltenden potentialbilder bei einer elektrografischen druck- oder kopiereinrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1766479A2 true EP1766479A2 (de) | 2007-03-28 |
Family
ID=35197835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05775114A Withdrawn EP1766479A2 (de) | 2004-07-07 | 2005-07-01 | Vorrichtung und verfahren zur entwicklung von zuvor auf einem potentialbildträger erzeugten die zu druckenden bilder enthaltenden potentialbilder bei einer elektrografischen druck- oder kopiereinrichtung |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070280737A1 (de) |
EP (1) | EP1766479A2 (de) |
JP (1) | JP4705638B2 (de) |
CN (1) | CN1989460B (de) |
CA (1) | CA2573013A1 (de) |
DE (1) | DE102004032922A1 (de) |
WO (1) | WO2006002941A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005371A1 (de) * | 2009-01-21 | 2010-07-29 | OCé PRINTING SYSTEMS GMBH | Anordnung zum Austausch eines flüssigen Mediums zwischen einer das flüssige Medium aufweisenden Kammer und einer rotierenden Transporteinheit für das flüssige Medium bei einem elektrografischen Druckgerät |
DE102009007343A1 (de) * | 2009-02-04 | 2010-08-05 | OCé PRINTING SYSTEMS GMBH | Anordnung zum Transport eines flüssigen Farbmediums bei einem Druckgerät |
DE102010008241B4 (de) * | 2010-02-17 | 2015-11-26 | Océ Printing Systems GmbH & Co. KG | Vorrichtung zur Entwicklung von auf einem Ladungsbildträger erzeugten Ladungsbildern bei einem elektrografischen Druck- oder Kopiergerät |
DE102012103328A1 (de) | 2012-04-17 | 2013-10-17 | Océ Printing Systems GmbH & Co. KG | Digitaldrucker zum Bedrucken eines Aufzeichnungsträgers |
DE102012111791B4 (de) | 2012-12-05 | 2015-01-22 | Océ Printing Systems GmbH & Co. KG | Digitaldrucker zum Bedrucken eines Aufzeichnungsträgers |
JP6402651B2 (ja) * | 2015-03-04 | 2018-10-10 | 富士ゼロックス株式会社 | 液体供給装置、現像装置及び画像形成装置 |
US11150599B2 (en) | 2018-03-16 | 2021-10-19 | Hewlett-Packard Development Company, L.P. | Air bearings |
US11294323B2 (en) * | 2018-03-16 | 2022-04-05 | Hewlett-Packard Development Company, L.P. | Air bearings |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4268597A (en) * | 1976-04-13 | 1981-05-19 | Philip A. Hunt Chemical Corp. | Method, apparatus and compositions for liquid development of electrostatic images |
FR2425941A2 (fr) * | 1978-05-16 | 1979-12-14 | Cii Honeywell Bull | Dispositif pour l'application de particules solides sur le support d'enregistrement d'une imprimante non-impact |
US5202728A (en) * | 1988-05-09 | 1993-04-13 | Mita Industrial Co., Ltd. | Image-forming machine with improved developer agitating means, developer regulating blade means, cleaning device, and toner recovery system |
JP3442406B2 (ja) * | 1990-03-30 | 2003-09-02 | ゼロックス・コーポレーション | 硬化性液体ベヒクルを有する液体現像剤 |
JP3189185B2 (ja) * | 1991-02-13 | 2001-07-16 | ゼロックス コーポレーション | 硬化性液体ベヒクルを含有する液体現像剤 |
JPH10293472A (ja) * | 1997-02-24 | 1998-11-04 | Ricoh Co Ltd | 画像形成装置 |
US6287741B1 (en) * | 1999-09-03 | 2001-09-11 | Research Laboratories Of Australia Pty Ltd | Liquid toner composition |
EP1090756B1 (de) * | 1999-10-05 | 2005-01-12 | Gallus Ferd. Rüesch Ag | Farbkammerrakel |
DE10027203A1 (de) * | 2000-05-31 | 2001-12-20 | Oce Printing Systems Gmbh | Einrichtung und Verfahren zum Reinigen und zum Regenerieren eines Bildträgers beim elektrografischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel |
DE10027175A1 (de) * | 2000-05-31 | 2001-12-13 | Oce Printing Systems Gmbh | Applikatorelement und Verfahren zum elektrografischen Drucken oder Kopieren unter Verwendung flüssiger Farbmittel |
US6735408B2 (en) * | 2001-03-21 | 2004-05-11 | Ricoh Company, Ltd. | Image forming apparatus with adjustable removal and developing nips |
KR100416559B1 (ko) * | 2001-10-12 | 2004-02-05 | 삼성전자주식회사 | 액체 전자사진 현상제 저장 및 전달 시스템 |
DE10234914B3 (de) * | 2002-07-31 | 2004-02-26 | OCé PRINTING SYSTEMS GMBH | Entwicklerstation für eine elektrografische Druck- oder Kopiereinrichtung |
JP4348938B2 (ja) * | 2002-11-01 | 2009-10-21 | セイコーエプソン株式会社 | 画像形成装置および方法 |
US7082271B2 (en) * | 2002-11-01 | 2006-07-25 | Seiko Epson Corporation | Image forming apparatus and image forming method using liquid development |
JP2005017605A (ja) * | 2003-06-25 | 2005-01-20 | Ricoh Co Ltd | 液体現像剤及び画像形成装置 |
US7141346B2 (en) * | 2003-03-20 | 2006-11-28 | Ricoh Company, Ltd. | Liquid developer for image forming apparatus |
US7471907B2 (en) * | 2003-07-29 | 2008-12-30 | Oce Printing Systems Gmbh | Device and method for electrophoretic liquid development |
EP1649326B1 (de) * | 2003-07-29 | 2011-10-05 | OCÉ Printing Systems GmbH | Vorrichtung und verfahren zur elektrophoretischen flüssigentwicklung |
DE102004009987B3 (de) * | 2004-03-01 | 2005-10-20 | Oce Printing Systems Gmbh | Verfahren zum Bedrucken eines Aufzeichnungsträgers |
-
2004
- 2004-07-07 DE DE102004032922A patent/DE102004032922A1/de not_active Withdrawn
-
2005
- 2005-07-01 CA CA002573013A patent/CA2573013A1/en not_active Abandoned
- 2005-07-01 US US11/631,371 patent/US20070280737A1/en not_active Abandoned
- 2005-07-01 CN CN2005800228445A patent/CN1989460B/zh active Active
- 2005-07-01 WO PCT/EP2005/007101 patent/WO2006002941A2/de active Application Filing
- 2005-07-01 EP EP05775114A patent/EP1766479A2/de not_active Withdrawn
- 2005-07-01 JP JP2007519684A patent/JP4705638B2/ja active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
US20070280737A1 (en) | 2007-12-06 |
CA2573013A1 (en) | 2006-01-12 |
WO2006002941A2 (de) | 2006-01-12 |
CN1989460B (zh) | 2010-04-21 |
JP4705638B2 (ja) | 2011-06-22 |
CN1989460A (zh) | 2007-06-27 |
DE102004032922A1 (de) | 2006-02-02 |
JP2008505371A (ja) | 2008-02-21 |
WO2006002941A3 (de) | 2006-05-18 |
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