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EP0487530B1 - Bildübertragungsgerät und -verfahren - Google Patents

Bildübertragungsgerät und -verfahren Download PDF

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Publication number
EP0487530B1
EP0487530B1 EP90907505A EP90907505A EP0487530B1 EP 0487530 B1 EP0487530 B1 EP 0487530B1 EP 90907505 A EP90907505 A EP 90907505A EP 90907505 A EP90907505 A EP 90907505A EP 0487530 B1 EP0487530 B1 EP 0487530B1
Authority
EP
European Patent Office
Prior art keywords
intermediate transfer
layer
transfer member
image
transfer
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
EP90907505A
Other languages
English (en)
French (fr)
Other versions
EP0487530A1 (de
Inventor
Benzion Landa
Itzhak Ashkenazi
Jan Van Mil
Hanna Pinhas
Ishaiau Lior
Paul Fenster
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.)
HP Indigo BV
Original Assignee
Indigo BV
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 US07/393,631 external-priority patent/US5089856A/en
Priority claimed from US07/393,649 external-priority patent/US5047808A/en
Application filed by Indigo BV filed Critical Indigo BV
Priority to EP93203341A priority Critical patent/EP0584893B1/de
Publication of EP0487530A1 publication Critical patent/EP0487530A1/de
Application granted granted Critical
Publication of EP0487530B1 publication Critical patent/EP0487530B1/de
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
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/005—Materials for treating the recording members, e.g. for cleaning, reactivating, polishing
    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition
    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/169—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer with means for preconditioning the toner image before the transfer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/14—Inert intermediate or cover layers for charge-receiving layers
    • G03G5/142—Inert intermediate layers

Definitions

  • the present invention relates to image transfer techniques and apparatus for use in liquid toner electrostatic imaging using an intermediate transfer member.
  • pressures used in offset printing are generally not specified. However, pressures are indicated to be in the general vicinity of 100-150 lb./sq. in. in the above reference and in U. S. Patent 3,983,287.
  • European Patent Publication 0 176 143 Al describes a powder toner copying machine utilizing an intermediate transfer member in which the pressure and deformation at first transfer is less than at second transfer.
  • Japanese patent publication 62-134673 describes a powder toner imaging system utilizing an intermediate transfer member in which the pressure is greater at second transfer than at first transfer.
  • U.S. Patent 4,912,514 describes a powder toner imaging system having a heated intermediate transfer belt where, in one embodiment the heater is formed of enlongate elements and the belt includes a silicone rubber layer.
  • U.S. Patent 4,708,460 describes a liquid toner imaging system in which an intermediate transfer member is used.
  • the present invention seeks to provide apparatus and techniques for improved electrostatic image transfer using an intermediate transfer member.
  • imaging apparatus comprising:
  • the resilient layer is situated between the heater and the transfer surface.
  • the intermediate transfer blanket comprises a conductive layer operative to apply an electric field to the image to enhance transfer of the liquid toner image from the image bearing surface to the intermediate transfer member.
  • the intermediate transfer member comprises a second compressible layer.
  • the heating layer is disposed intermediate the compressible layer and the second compressible layer.
  • Fig. 1 illustrates electrostatic imaging apparatus constructed and operative in accordance with a preferred embodiment of the present invention.
  • This and other embodiments of the invention are described by way of example for apparatus utilizing liquid toner with negatively charged toner particles, and for a write-white system.
  • the magnitudes and or the polarities of the voltages may be adjusted as is well known in the art.
  • the toner of Example 1 of U.S. Patent 4,794,651 the disclosure of which is hereby referred to, is employed, but a variety of liquid toner types may be used in the practice of the invention.
  • the apparatus of Fig. 1 comprises a drum 10 arranged for rotation about an axle 12 in a direction generally indicated by arrow 14.
  • the drum 10 is formed with a cylindrical photoconductor surface 16.
  • a corona discharge device 18 is operative to generally uniformly charge the photoconductor surface 16 with a positive charge.
  • an exposure unit including a lens 20, which focuses a desired image onto the charged photoconductor surface 16, there by selectively discharging the photoconductor surface and producing an electrostatic latent image thereon.
  • Lens 20 may be the lens of a photocopier, as illustrated. Alternatively the latent image may be formed by a laser scanner.
  • photoconductor surface 16 passes a typically positively charged, rotating roller 26, preferably rotating in a direction indicated by an arrow 28.
  • a typically positively charged, rotating roller 26 preferably rotating in a direction indicated by an arrow 28.
  • the spatial separation of the roller 26 from the photoconductor surface 16 is about 50 microns.
  • the voltage on roller 26 is intermediate the voltages of the latent image areas and of the background areas on the photoconductor surface 16.
  • Typical voltages are: roller 26: +300 to +500 V, background area: +50 V and latent image areas: up to +1000 V.
  • roller 26 rotating in the direction indicated by arrow 28, functions as a metering roller and reduces the thickness of liquid carrier on the photoconductor surface 16, as is known in the art.
  • the photoconductor surface 16, after passing the roller 26, should be relatively free of pigmented toner particles except in the region of the latent image.
  • Rigidizing roller 30 is preferably formed of a resilient polymeric material, such as the conductive resilient polymeric materials described in either or both of U.S. Patents 3,959,574 and 3,863,603, the disclosures of which are hereby referred to. Roller 30 is preferably maintained in contacting and preferably pressured relationship with the photoconductor surface 16.
  • the biased squeegee described in U. S. Patent 4,286,039, the disclosure of which is hereby referred to is used as the roller 30.
  • a corona discharge takes place and a current of approximately 50 - 100 microamperes for a drum width of 30 cm, flows from the squeegee.
  • Roller 30 repels negatively charged pigmented toner particles and causes them to more closely approach the image areas of the photoconductor surface 16, thus compressing and rigidizing the toner image thereon.
  • an intermediate transfer member 40 Downstream of rigidizing roller 30 there is provided an intermediate transfer member 40, which rotates, as shown by arrow 41, in a sense opposite to that of drum 10, and is operative for receiving the toner image from surface 16 and for transferring the toner image to a receiving substrate 42, such as paper, which is supported by a roller 43.
  • intermediate transfer member 40 is configured and mounted with respect to drum 10 so as to provide first transfer engagement between intermediate transfer member 40 and image bearing photoconductor surface 16 for transfer of an image from surface 16 to the intermediate transfer member 40 at a first pressure, thereby producing radial deformation of the intermediate transfer member to a first deformation degree.
  • intermediate transfer member 40, substrate 42 and roller 43 are preferably such as to provide second transfer engagement between intermediate transfer member 40 and substrate 42 for transfer of the image from intermediate transfer member 40 to substrate 42 at a second pressure, which exceeds the first pressure by a first multiple, producing radial deformation of the intermediate transfer member to a second deformation degree which exceeds the first deformation degree by a second multiple substantially less than the first multiple.
  • an intermediate transfer member characterized in that deformation thereof increases less than linearly with the application of increased pressure thereto.
  • the structure of intermediate transfer members in accordance with preferred embodiments of the invention is described hereinbelow in detail.
  • Transfer of the image to intermediate transfer member 40 is preferably facilitated by providing electrification of the intermediate transfer member 40 to a voltage opposite that of the charged particles, although other methods known in the art may be employed. Subsequent transfer of the image to substrate 42 is preferably facilitated by heat and pressure, although other methods known in the art may be employed.
  • the photoconductor surface 16 is engaged by a cleaning roller assembly 50, including a pair of rollers 52, which typically rotate in opposite directions, and a nozzle 54.
  • Cleaning roller assembly 50 is operative to scrub and clean surface 16.
  • a cleaning material such as liquid developer, may be supplied to the assembly 50 via nozzle 54.
  • a suitable cleaning assembly is shown and described in U.S. Patent 4,439,035, the disclosure of which is hereby referred to. Any residual charge left on the photoconductor surface 16 may be removed by flooding the photoconductor surface 16 with light from a lamp 58.
  • FIG. 2 illustrates electrophotographic imaging apparatus constructed and operative in accordance with another preferred embodiment of the present invention.
  • the apparatus of Fig. 2 shares many common elements with that of Fig. 1. These elements are indicated by identical reference numerals, and for the sake of conciseness are not described herein a second time.
  • Fig. 2 differs from that of Fig. 1 in that a belt-type intermediate transfer member 70 is employed instead of the roller type member 40 in the embodiment of Fig. 1.
  • Belt-type intermediate transfer members are well known in the art and are described, inter alia, in U.S. Patents 3,893,761, 4,684,238 and 4,690,539, the disclosures of which are hereby referred to.
  • Intermediate transfer member 70 is preferably charged so as to provide electrophoretic transfer thereto of the image from the photoconductor surface 16.
  • the efficiency of electrophoretic transfer of the image is generally enhanced by increasing the potential difference between photoconductor surface 16 and intermediate transfer member 70. Increase in the potential difference between the photoconductor surface 16 and the intermediate transfer member 70 is limited, however, by the danger of severe electrical breakdown, which increases with an increase in potential difference.
  • FIG. 3A conceptually illustrates an intermediate transfer member 40 comprising a drum 80 having a generally cylindrical surface over which is tensioned a multi-layer intermediate transfer blanket 82, which is supported and tensioned by a blanket lockup mechanism 84.
  • the electrical connections to the various voltage bearing portions of intermediate transfer blanket 82 are not shown, it being understood that they are achieved in a conventional manner using rotating contacts.
  • a preferred embodiment of multi-layer intermediate transfer blanket 82 is illustrated in Fig. 3B and comprises a substrate (backing layer) 90 with high temperature capabilities, preferably formed of Kapton (DuPont) polyimide film of thickness about 100 microns.
  • a blanket heater 92 preferably comprising a meandering ribbon conductor of Nichrome (Trademark; an alloy of Driver Harris Org.) in a sandwich of Kapton.
  • Blanket heater 92 has a total thickness of about 250 microns.
  • blanket heater 92 Normally one surface of blanket heater 92 has a slightly raised pattern due to the presence of the ribbon. Accordingly, it is preferable to arrange the blanket heater 92 such that the surface having the slightly raised pattern lies facing substrate 90.
  • Blanket heater 92 in conjunction with the rest of the intermediate transfer blanket 82, operates to improve transfer of the image to the final substrate by heating the toner image.
  • the surface of the blanket should be heated to a temperature above the solvation temperature of the toner image, i.e. above the temperature at which the toner particles become tacky to the final substrate.
  • the blanket heater is preferably operative to heat the image on the intermediate transfer member to about 100-110° C.
  • the top of the blanket heater 92 is preferably attached to an approximately 100 micron thick aluminum foil 93.
  • This foil also provides electromagnetic shielding of the image transfer regions of the imaging apparatus from interference produced by AC currents used to heat the blanket 92.
  • the width of the Nichrome ribbon is chosen such that the ribbon covers a major portion, preferably over 80%, of the blanket, to ensure even heating thereof.
  • a three part sponge assembly layer 94 Disposed over foil 93 is a three part sponge assembly layer 94, including a layer 96 typically formed of Kapton, typically of thickness 100 microns, a sponge layer 98, typically of thickness 300 microns and a fabric layer 100, typically formed of NOMEX (DuPont) and being typically of thickness 350 microns.
  • the total sponge assembly layer thickness is typically 800 microns.
  • Nomex is basically an aromatic polyamide and chars at 420°C.
  • the assembly layer 94 is preferably formed by blending the following materials, which form the sponge layer 98, in the following proportions, in a two roll mill: a. Fluorosilicone (FSE-2080 General Electric) 78.39% b. Silicone (Silastic 4-2735 Dow Corning) 11.71% c. Blowing Agent (#9038 Rhone Poulenc) 9.00% d. Cross-Linker (Di Cumyl Peroxide) 0.90%
  • the blended material is formed into the assembly layer 94 by calendering between the fabric layer 100 and the Kapton layer 96 as illustrated in Fig. 4.
  • the total thickness of assembly layer 94 is typically about 670 microns after calendering.
  • the assembly layer 94 is then preferably cured for 10 minutes under nitrogen at 170° C and preferably in a jig to control the total swelling thereof to a final total thickness of about 800 microns. After the curing, the assembly layer 94 preferably undergoes a post-cure at 200° C for four hours.
  • the sponge assembly layer 94 allows conformity between surface 16 and intermediate transfer member 40 at the first transfer at a relatively low pressure, such as 100 - 500 gm/cm 2 at a temperature of about 100-110° C, with relatively low deformation, such as 30 - 200 microns, overcoming any surface unevenness of the mating surfaces.
  • sponge assembly layer 94 is further characterized in that it undergoes relatively high pressure, such as 2000 to 4000 gm/cm 2 at the second transfer with proportionately low deformation, greater then that at first transfer, preferably about 250 microns.
  • the pressure at the first transfer surface can be increased up to about 500 gm/cm 2 , without substantial image degradation.
  • a blanket 102 typically of about 1200 microns thickness.
  • Blanket 102 typically includes a layer 104 of relatively stiff sponge, over which is formed a layer 106 of nitrilic rubber. Blanket 102 may be produced by removing the fabric layer from the three-ply Vulcan 714 offset printing blanket commercially available from Reeves Brothers, Inc.
  • Over printing blanket 102 there is provided a 2-3 micron thick layer 108 of nitrocellulose loaded with carbon black to provide a conductive layer for the high voltage applied to the intermediate transfer member.
  • This layer has an end to end resistance of about 20 - 30 kohm, but since the current drawn to the drum is only 50 - 100 microamperes, the voltage drop on the layer is less than 3 volts out of the applied voltage of 500 - 600 volts.
  • An outer layer 110 typically comprises a 2 - 3 micron thick layer of silicone rubber, such as Syl-Off 294, which acts as a release layer.
  • a blanket 114 in accordance with an alternative preferred embodiment of the invention is shown conceptually in cross section in Fig. 3C.
  • the lowest level of the blanket is a Kapton layer 116, typically 100 microns thick, which is similar to layer 96 of Fig. 3B.
  • the next layer is a sponge layer 118, functionally similar to sponge layer 98 shown in Fig. 3B and typically 300 microns thick.
  • a heater 120 Situated above layer 118 is a heater 120, with typical thickness 650 microns, whose structure and manufacture are described hereinbelow.
  • An acrylic rubber layer 122 is formed onto the heater 120 and preferably penetrates thereinto.
  • a conducting layer 124 and a release layer 126 complete the blanket.
  • Additional spacer material 128, typically of Kapton, may be added below the blanket, if additional blanket thickness is required. Alternatively the Kapton layer 116 may be thicker than the indicated thickness.
  • heater 120 may be formed by weaving heater wire 130 forming the woof and twisted thread 132 as the warp.
  • wire 130 is formed of a 300 micron diameter copper core with a 10 micron lacquer coating, for a total diameter of 320 microns.
  • Thread 132 is preferably of twisted Nomex thread with a nominal diameter of 320 microns.
  • connection wires 134 for energizing the heater are extensions of the heater wires 130.
  • a Nomex cloth extension 136 is provided beyond each end of the heater portion of the heater 120.
  • the unconventional structure of the blanket heater 120 of Figs. 3D and 3E enables its placement over sponge layer 118. It is noted that heater 92 of the embodiment illustrated in Fig. 3B is placed below the sponge layer 98. Since heater 92 is relatively stiff in both the circumferential and the axial directions, placement of the heater 92 above the sponge layer would substantially shield the blanket-photoconductor and blanket-final substrate image transfer interfaces from the compression properties of the sponge assembly 94.
  • Heater 120 is stiff in the axial direction, but is pliable in the circumferential direction and thus transmits the pressure at the respective interfaces to the sponge layer. Placing the heater closer to the transfer surface allows for a lower heater temperature for the same surface temperature, and allows the sponge layer to be much cooler.
  • the pressure along lines in the axial direction is substantially constant compared to the variations in the circumferential direction; it would be perfectly constant were the transfer surfaces perfect and the mechanical tolerances equal to zero. The imperfections and tolerances cause some small minor variations in deformation and hence in pressure along the axial lines.
  • FIG. 3F and 3G An alternative preferred heater 150 is shown in Figs. 3F and 3G.
  • two inputs 151 and 152 are at the same end of the heater wires and the wires are threaded in a paired spaced relationship as shown in Figs. 3F and 3G.
  • Additional input 153 is electrically connected to the other end of the heater such that the current path between inputs 151 and 153 is of substantially the same length as that of the current path between inputs 152 and 153.
  • the heater 150 is preferably energized with the circuit of Fig. 6, wherein the input to a transformer 157 is an AC voltage and a pair of output terminals 154 and 156 of transformer 157 are at the same voltage and at opposite phases with respect to a third terminal 155. Terminals 154, 155 and 156 are electrically insulated from the AC input.
  • heater 150 is incorporated in a blanket, and installed in the apparatus of Fig. 1.
  • Terminals 154 and 156 are electrically connected to inputs 151 and 152, and additional input 153 is connected to terminal 155.
  • the wires can be "crossed" at each reversal of the wire direction (at the edges of the heater). One such crossing is shown in Fig. 3H.
  • wire 153 and terminal 155 may be externally electrically connected to the bias layer 124.
  • wire 153 and terminal 153 may be connected to a source of high voltage in order to provide a field at the transfer regions and layer 124 may be omitted.
  • a substantially higher voltage would be required to provide the field due to the greater distance of the heater from the transfer surface.
  • FIG. 3I An alternative preferred heater 160 is shown in Fig. 3I.
  • the wire and thread are woven in a similar manner to that of the embodiment shown in Fig. 3D.
  • Two connection wires 162 and 164 for energizing the heater are extensions of the heater wire and an additional wire 168 is electrically connected to the center of the length of wire used to form the heater. In operation the heater is energized by connecting wires 162 and 164 to terminals 154 and 156 respectively, and connecting wire 168 to terminal 155.
  • Layer 122 preferably has the following properties:
  • Blanket 114 is preferably manufactured using the following process, although any other suitable manufacturing method may be used:
  • HYTEMP 4051 Acrylic rubber compound manufactured by B.F. Goodrich 100 parts by weight of HYTEMP 4051 Acrylic rubber compound manufactured by B.F. Goodrich is mixed in a two roll mill with 15 parts of very fine silica, 4 parts sodium stearate and 2 parts NPC-50 crosslinker, until the mixture is smooth. The silica is added to increase the electrical resistivity, mechanical cohesiveness and strength of the final polymer.
  • a heater 120 is placed in a mold coated with silicone oil, and is covered with the rubber/silica mixture. The mixture is cured in the mold to a final thickness of 1500 microns at a temperature of 180°C for 15 minutes. The mold is cooled and the resulting sheet is removed. It will be appreciated that this sheet comprises heater 120 and rubber layer 122 formed into an integral unit due to the filling of the heater by the rubber/silica mixture before curing.
  • HYTEMP 4051 Acrylic rubber compound manufactured by B.F. Goodrich is mixed in a two roll mill with 15 parts of very fine silica, 4 parts of sodium stearate, 2 parts of NPC-50 crosslinker and 11 to 33 parts by weight of Blowing Agent (#9038 Rhone Poulenc) until the mixture is smooth.
  • the silica is added to increase the cohesiveness of the sponge.
  • 1 part of the mixture is mixed with preferably 2 parts of a solvent, preferably acetone or MEK, in order to reduce its viscosity.
  • the blended material is calendered between the double layer 120 and 122 and the Kapton layer 116 essentially as described above and as illustrated in Fig. 4 for the manufacture of sponge layer 98.
  • the total thickness of the resulting multilayer sheet 118, 122, 120 and 116 after calendering will depend on the amount of blowing agent used and can be determined experimentally.
  • the triple layer is cured, preferably in a jig, to control the total swelling thereof, at a temperature of 180°C for 15 minutes.
  • the mold is cooled and the resulting sheet is removed. It will be appreciated that this sheet comprises all four layers formed into an integral unit.
  • the Kapton layer 116 can be replaced by a Nomex cloth layer, since the acrylic rubber layers together with a Nomex cloth layer appear to give sufficient structural strength to the blanket.
  • HYTEMP 4051 15 parts of HYTEMP 4051, 100 parts of MEK (methylmetacrilate), 6 parts of carbon black (Printex XE-2 manufactured by Degussa) and 2 parts of NPC-50 cross-linker are mixed in a cooled ball attritor for 12 hours.
  • This material is wire coated onto the surface of layer 122 and cured at 150°C for 15 minutes to form an approximately 2 micron thick conducting layer with a resistance of between 10-100 kohm/square, preferably 30-50 kohm/square, bonded to layer 122.
  • Post curing of the HYTEMP 4051 is not part of the process as recommended by the manufacturer. however it has been found that the stability of the material under compression cycling at operating temperature was improved by the addition of a 180° C, 12 hour post curing step.
  • Syl-off 294 100 parts of Syl-off 294 is diluted 1:1 with Isopar L. 15 parts of Syl-off 297 ancorning agent and 5 parts of Dow Corning 176 cross-linker are added to the mixture. This mixture is wire coated on to the surface of conducting layer 124 and air cured at 110°C for 10 minutes to provide a 5-6 micron thick layer.
  • Fig. 5 is a graph which illustrates the approximate desired pressure/deformation characteristics of the intermediate transfer member structures shown in Fig. 3B-3I, under ordinary use conditions, in intermediate transfer apparatus constructed and operative according to a preferred embodiment of the present invention.
  • the invention is illustrated herein with examples employing a single developer station.
  • the invention is especially useful in imaging systems with a multiplicity of development stations preferably with different color liquid developers, or with a single station in which the liquid developer is changed between colors.
  • each individual color image may be transferred to the final substrate from the ITM individually, or the colored images may be transferred sequentially to the ITM and then transferred to the substrate together.
  • Color imaging equipment is described in U. S. Patents 4,788,572; 4,690,539 and 3,900,003, the disclosure of which documents are hereby referred to.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Electronic Switches (AREA)

Claims (9)

  1. Bilderzeugungsvorrichtung mit
    einer bildtragenden Oberfläche (16);
    Einrichtungen zur Bildung eines Tonerbildes auf der bildtragenden Oberfläche;
    einem Zwischenübertragungselement (40, 72), das eine Übertragung des Tonerbildes von der bildtragenden Oberfläche auf eine Übertragungsoberfläche (110, 126) des Zwischenübertragungselementes und nachfolgend eine Übertragung auf ein Substrat (42) bewirkt,
       dadurch gekennzeichnet, daß das Zwischenübertragungselement einen starren Kern (80) und ein Zwischenübertragungstuch (82) aufweist, das um den Kern gewickelt ist und lösbar an ihm befestigt ist.
  2. Vorrichtung nach Anspruch 1, wobei das Tonerbild ein Flüssigtoner-Bild ist.
  3. Vorrichtung nach Anspruch 1, wobei das Zwischenübertragungstuch (82) aufweist:
    eine Übertragungsoberfläche (126) zum betriebsmäßigen Eingriff mit der ersten und der zweiten Oberfläche;
    eine elastische Schicht (122);
    eine Schaumstoffschicht (118), die weicher ist als die elastische Schicht; und
    eine Flächenheizeinrichtung (120), die zwischen der relativ nachgiebigen Schaumstoffschicht und der elastischen Schicht angeordnet ist.
  4. Vorrichtung nach Anspruch 3, wobei die elastische Schicht zwischen der Heizeinrichtung und der Übertragungsoberfläche angeordnet ist.
  5. Vorrichtung nach einem der vorangehenden Ansprüche, wobei das Zwischenübertragungstuch eine leitende Schicht (108, 124) aufweist, die das Anlegen eines elektrischen Feldes an das Bild zur Verstärkung der Übertragung des Flüssigtoner-Bildes von der bildtragenden Oberfläche auf das Zwischenübertragungselement bewirkt.
  6. Vorrichtung nach Anspruch 1 oder 2, wobei das Zwischenübertragungstuch aufweist:
    eine nach außen zeigende Übertragungsoberfläche (106, 110) ;
    eine zusammendrückbare Schicht (98, 104, 98, 118);
    eine Stützschicht (116, 90, 128); und
    eine Heizschicht (92, 120), die zwischen der Stützschicht und der Übertragungsoberfläche angeordnet ist.
  7. Vorrichtung nach Anspruch 6, wobei das Zwischenübertragungselement eine zweite zusammendrückbare Schicht (98, 104) aufweist.
  8. Vorrichtung nach Anspruch 7, wobei die Heizschicht zwischen der zusammendrückbaren Schicht und der zweiten zusammendrückbaren Schicht angeordnet ist.
  9. Bilderzeugungsvorrichtung nach einem der vorangehenden Ansprüche mit
    Einrichtungen zur Erzeugung eines ersten Übertragungseingriffes zwischen dem Zwischenübertragungselement und der bildtragenden Oberfläche zum Übertragen des Tonerbildes von der bildtragenden Oberfläche auf das Zwischenübertragungselement bei einem ersten Druck, der eine Verformung des Zwischenübertragungselementes mit einem ersten Verformungsgrad erzeugt;
    Einrichtungen zur Erzeugung eines zweiten Übertragungseingriffes zwischen dem Zwischenübertragungselement und dem Substrat zum Übertragen des Tonerbildes von dem Zwischenübertragungselement auf das Substrat bei einem zweiten Druck, der eine Verformung des Zwischenübertragungselementes mit einem zweiten Verformungsgrad bewirkt, wobei
    das Verhältnis des zweiten Druckes zu dem ersten Druck im wesentlichen größer ist als das Verhältnis des zweiten Verformungsgrades zu dem ersten Verformungsgrad.
EP90907505A 1989-08-14 1990-04-17 Bildübertragungsgerät und -verfahren Expired - Lifetime EP0487530B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93203341A EP0584893B1 (de) 1989-08-14 1990-04-17 Bildübertragungsgerät und -verfahren

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US393649 1989-08-14
US393631 1989-08-14
US07/393,631 US5089856A (en) 1989-02-06 1989-08-14 Image transfer apparatus incorporating an internal heater
US07/393,649 US5047808A (en) 1989-02-06 1989-08-14 Image transfer apparatus including a compliant transfer member
PCT/NL1990/000049 WO1991003006A1 (en) 1989-08-14 1990-04-17 Image transfer apparatus and method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP93203341.8 Division-Into 1993-11-30

Publications (2)

Publication Number Publication Date
EP0487530A1 EP0487530A1 (de) 1992-06-03
EP0487530B1 true EP0487530B1 (de) 1996-07-10

Family

ID=27014383

Family Applications (3)

Application Number Title Priority Date Filing Date
EP97201407A Withdrawn EP0791860A3 (de) 1989-08-14 1990-04-17 Organischer Photoleiter
EP93203341A Expired - Lifetime EP0584893B1 (de) 1989-08-14 1990-04-17 Bildübertragungsgerät und -verfahren
EP90907505A Expired - Lifetime EP0487530B1 (de) 1989-08-14 1990-04-17 Bildübertragungsgerät und -verfahren

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP97201407A Withdrawn EP0791860A3 (de) 1989-08-14 1990-04-17 Organischer Photoleiter
EP93203341A Expired - Lifetime EP0584893B1 (de) 1989-08-14 1990-04-17 Bildübertragungsgerät und -verfahren

Country Status (5)

Country Link
EP (3) EP0791860A3 (de)
JP (1) JP3086858B2 (de)
CA (1) CA2064816C (de)
DE (2) DE69031779T2 (de)
WO (1) WO1991003006A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592269A (en) * 1993-03-26 1997-01-07 Indigo N.V. Imaging system having an intermediate transfer member
US5414498A (en) * 1993-09-14 1995-05-09 Delphax Systems Liquid/dry toner imaging system
US5619313A (en) * 1995-05-01 1997-04-08 Xerox Corporation Method and apparatus for liquid image development and transfer
IL114992A0 (en) * 1995-08-17 1995-12-08 Indigo Nv Intermediate transfer blanket and method of producing the same
JP2002507147A (ja) 1997-06-03 2002-03-05 インデイゴ ナムローゼ フェンノートシャップ 中間転写ブランケットおよびその製造方法
DE19934658A1 (de) * 1999-07-23 2001-01-25 Nexpress Solutions Llc Druckvorrichtung
CN113427888B (zh) * 2021-06-15 2022-06-17 清华大学 印章单元的设计方法、印章单元及印章

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Publication number Priority date Publication date Assignee Title
US3591276A (en) * 1967-11-30 1971-07-06 Xerox Corp Method and apparatus for offset xerographic reproduction
DE1814644B2 (de) * 1967-12-26 1976-09-02 Fuji Shashin Film K.K., Ashigara, Kanagawa (Japan) Elektrophotographisches aufzeichnungsmaterial
US3717462A (en) * 1969-07-28 1973-02-20 Canon Kk Heat treatment of an electrophotographic photosensitive member
US3764590A (en) * 1970-04-08 1973-10-09 Hitachi Ltd Organic photoconductive materials
JPS4923905B1 (de) * 1970-10-31 1974-06-19
DE3032773A1 (de) * 1980-08-30 1982-05-06 Hoechst Ag, 6000 Frankfurt Elektrophotographisches aufzeichnungsmaterial und verfahren zu seiner herstellung
US4531825A (en) * 1981-11-25 1985-07-30 Konishiroku Photo Industry Co., Ltd. Electrostatic reproducing apparatus having an intermediate toner image transfer member
NL8301978A (nl) * 1983-06-03 1985-01-02 Oce Nederland Bv Werkwijze voor het overdragen van een poederbeeld naar een ontvangstmateriaal en inrichting voor het uitvoeren van de werkwijze.
JPS615253A (ja) * 1984-06-19 1986-01-11 Matsushita Electric Ind Co Ltd 電子写真感光体
NL8402912A (nl) * 1984-09-24 1986-04-16 Oce Nederland Bv Optisch afbeeldingssysteem voor een kopieerapparaat.
US4708460A (en) * 1986-07-25 1987-11-24 Xerox Corporation Simultaneous transfer and fusing in electrophotography
US4912514A (en) * 1987-05-19 1990-03-27 Citizen Watch Co., Ltd. Electrophotographic printer
NL8702691A (nl) * 1987-11-11 1989-06-01 Oce Nederland Bv Inrichting voor het overdragen van een poederbeeld naar een ontvangstmateriaal en het fixeren van het poederbeeld daarop.

Also Published As

Publication number Publication date
EP0487530A1 (de) 1992-06-03
EP0791860A3 (de) 1997-12-03
JPH04507148A (ja) 1992-12-10
DE69027777D1 (de) 1996-08-14
DE69031779D1 (de) 1998-01-15
DE69027777T2 (de) 1997-02-20
EP0584893B1 (de) 1997-12-03
DE69031779T2 (de) 1998-06-18
WO1991003006A1 (en) 1991-03-07
CA2064816A1 (en) 1991-02-15
EP0791860A2 (de) 1997-08-27
EP0584893A2 (de) 1994-03-02
JP3086858B2 (ja) 2000-09-11
CA2064816C (en) 2001-11-06
EP0584893A3 (de) 1994-10-26

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