EP0956973B1 - Blanchet pour l'impression avec transfert complet de l'encre - Google Patents

Blanchet pour l'impression avec transfert complet de l'encre Download PDF

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Publication number
EP0956973B1
EP0956973B1 EP99107377A EP99107377A EP0956973B1 EP 0956973 B1 EP0956973 B1 EP 0956973B1 EP 99107377 A EP99107377 A EP 99107377A EP 99107377 A EP99107377 A EP 99107377A EP 0956973 B1 EP0956973 B1 EP 0956973B1
Authority
EP
European Patent Office
Prior art keywords
blanket
plate cylinder
cylinder
roller
printing
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
EP99107377A
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German (de)
English (en)
Other versions
EP0956973A2 (fr
EP0956973A3 (fr
Inventor
Robert Richard Murray
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0956973A2 publication Critical patent/EP0956973A2/fr
Publication of EP0956973A3 publication Critical patent/EP0956973A3/fr
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Publication of EP0956973B1 publication Critical patent/EP0956973B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/44—Arrangements to accommodate interchangeable cylinders of different sizes to enable machine to print on areas of different sizes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/02—Top layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/04—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/06—Backcoats; Back layers; Bottom layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Definitions

  • the present invention relates to rotary printing presses, in particular to Rotary printing machines for printing with variable section length.
  • Offset printing is usually done in a continuous process in which a web of material or a printing material passes through different processing stages one after the other until a finished printed product is available.
  • the web will be one Pickup roller taken over and then runs through z.
  • the printing unit of an offset printing machine comprises an inking unit with ink rollers, which the Apply ink to the plate mounted on the plate cylinder.
  • the pressure plate carries that image to be printed.
  • the ink is transferred from the printing plate to one on the blanket cylinder mounted rubber blanket transfer (the "printing plate-rubber blanket transfer").
  • the Rubber blanket in turn transfers the color to the material web (the rubber blanket web transfer ").
  • the plate cylinder and the "blanket cylinder have essentially parallel axes and are driven so that the surface speed of the Printing plate agrees with the surface speed of the blanket so far as necessary to ensure an acceptable transfer of color from the plate to the blanket to ensure.
  • the ratio of the plate cylinder diameter (i.e. the plate cylinder with the mounted plate) to the diameter of the rubber blanket is an integer and takes z.
  • B the Value 1: 1.
  • Other diameter ratios are also conceivable, for example with Printing plate cylinders with simple diameter, those with blanket cylinders work together with double diameter.
  • Latent images on the rubber blanket are colored images that are due to the rubber blanket
  • the image which is due to the immediately preceding color transfer from the Plate cylinder on the rubber blanket
  • the latent image i.e., an image, that comes from an earlier ink transfer from the printing plate to the rubber blanket, in which the color has not been completely transferred
  • the material web what is also commonly referred to as "doubling".
  • variable section length printing i. H. the printing in which the Image length and thus the plate diameter changes from one print job to another, thereby complicated that the diameter of the blanket cylinder the diameter of the Plate cylinder must be adjusted so that a ratio of integers arises.
  • the present invention does that Matching the diameter of the plate cylinder to the diameter of the blanket cylinder on each other unnecessarily. This allows the diameter of the plate cylinder in relation to the Diameter of the blanket cylinder can be variable.
  • US 5,186,103 shows a printing unit that is equipped with exchangeable printing cylinders.
  • the two cylinders in a cassette which is along an alternating path is interchangeable.
  • the known device Ink application rollers which apply a force to the respective Printing plate cylinders can be started.
  • a blanket cylinder which a blanket with a Surface layer made of a fluoropolymer of vinylidene fluoride and hexafluoropropylene having.
  • a rubber blanket is also known from JP-A-3 278 992, which has a surface layer which contains a fluoropolymer.
  • WO-A-91/11330 discloses a rubber blanket with a surface layer of one Fluoropolymer such as polyvinyl chloride or polytetrafluoroethylene. This material is considered Surface layer arranged on a compressible intermediate layer, which in turn on a first layer is arranged.
  • the aim of the present invention is to develop a printing press that has a interchangeable plate cylinder covers to print with different section lengths can, as well as an adjustable inking unit, which is adapted to plate cylinders with different Diameters, and a fully printing blanket, i.e. H. a rubber blanket, on which no color remains that is in rolling contact with the replaceable plate cylinder and which is suitable for taking a colored image of the plate cylinder and in essentially to transfer the entire image onto a material web to be printed.
  • a fully printing blanket i.e. H. a rubber blanket
  • the present invention relates to a rotary rotary offset printing machine for printing with variable section length, with a blanket cylinder carrying a rubber blanket, with a size plate plate carrying a printing plate, which is interchangeable for changing the section length or designed for receiving sleeves of different thicknesses, and with an inking unit which comprises an inking roller which can be set at different positions on the plate cylinder, characterized, that the ratio of the diameter of the plate cylinder and blanket cylinder is not an integer, and that the rubber blanket has a surface layer made of a material with a low polar surface energy for the essentially complete transfer of color to a material web.
  • An advantage of the present invention is that in printing machines with adjustable Inking units and optimized, fully printing blankets printing plates for different section lengths (i.e. printing plates with different diameters and thus different image lengths) can be used if that, ratio of the diameters of Plate and blanket cylinder is not an integer.
  • the diameter of the Plate cylinders can be any non-integer Multiple of the diameter of the blanket cylinder.
  • a printing press can be designed so that the Dimensions of the blanket cylinder are optimized in terms of factors like that Blanket life, speed of rotation, cooling and internal components such as Axles and gears.
  • Blanket life the dimension of the blanket cylinder
  • those for printing and Blanket cylinders used gears and axles to a degree of flexibility, which in part depends on the size of the cylinders.
  • the size of these Components are optimized in terms of their flexibility or rigidity and will no longer be through the requirement of an appropriate relationship between the Cylinders affected.
  • the diameter the blanket cylinder no longer z. B. by a tedious underlay of paper sheets appropriate thickness must be chosen carefully so that it together with the thickness of the Blanket forms the required relationship to the plate cylinder.
  • the inking rollers can, for. B. be chosen so that the color transfer at certain operating speeds is optimal. You can also choose from geometric Considerations and requirements can be selected, e.g. B. how best can be fitted into the inking unit and how the inking unit overall is best in the printing unit can be fitted.
  • the inking unit can be relative to the printing unit, e.g. B. be movable to the plate cylinder, so that a single adjustable inking unit Plate cylinders of different sizes can be adjusted.
  • a printing press may include a non-directly driven plate cylinder, e.g. B. exclusively by frictional contact, for example with the driven ink rollers or the driven blanket cylinder is driven.
  • the Printing machine comprise a directly driven plate cylinder which, for. B. means Friction contact drives the blanket cylinder, the blanket also partially due to frictional contact with a driven web of material that the rubber blanket contacted, driven.
  • a combination of these types of drives can also be used in Face and back printing are applied, d. H. if both sides of one at the same time Material web can be printed.
  • the upper plate cylinder are driven by a motor and via frictional contact drive the upper blanket cylinder while the lower plate cylinder over Frictional contact could be driven by the lower blanket cylinder.
  • the Plate cylinder, the blanket cylinder and / or the material web driven directly and drive one or more of the other cylinders.
  • FIG. 1a-1c show partially schematic side views of a section of a Printing unit 1, which has a lower blanket cylinder 10 and an upper Blanket cylinder 20 includes.
  • the blanket cylinders 10, 20 are rotatable on one Frame or attached to several frames of the printing unit 1 and form one Pressure gap through which a material web 2 can move.
  • An upper one Plate cylinder 30a, 30b or 30c to which a printing plate is attached is adjacent to the upper blanket cylinder 20 is rotatably arranged.
  • the inking unit or the inking roller train 40 comprises z. B.
  • Die Metering roller 42 is adjacent to and takes up ink from the ductor 41.
  • Blanket cylinders 10, 20 preferably sleeve-shaped (not shown here) Blankets 11, 21 attached.
  • the lower blanket cylinder 10 are a lower (not shown) plate cylinder and a lower (not shown) inking unit assigned.
  • the lower cylinder 10 can also be only one Impression cylinders act when the second - d. H. lower - side of the material web 2 not is to be printed on (i.e. if you are working in straight printing only). Unless it is is explicitly mentioned otherwise, is always in the following with a blanket cylinder Rubber blanket cylinder with rubber blanket attached to it.
  • plate cylinder usually on a plate cylinder with one on it attached (flat or sleeve-shaped) pressure plate or on a cylinder with a other known image material attached to its outer surface, e.g. B. a layer or film that can be directly imaged using laser beams.
  • the printing unit 1 further includes z. B. four drive motors 5, 5a, 6, 7.
  • the first motor 5 drives the duct 41.
  • the second motor 5a drives the metering roller 42.
  • the third Motor 6 drives the inking roller 40 via the primary roller 43.
  • the fourth engine 7 drives the blanket cylinder 20.
  • the fourth motor 7 can, as shown by the dashed line Lines in Fig. 1a-1c, 2-4 and 7 is indicated, alternatively the Drive plate cylinder 30, 30a, 30b, 30c.
  • the speed of the metering roller 42 preferably coincides with the speed of the primary roller 43; being the second motor 5a can be omitted if discrepancies are neglected.
  • the ductor 41 rotates at a lower speed so that a large amount of paint is applied its surface is distributed without the need for considerable force and without the paint splashing. Therefore, the metering roller 42 has to the speed of the printing unit to rotate, regardless of the ductor 41 either are driven by a motor 5a or by the driven primary roller 43.
  • Gear 200 may be provided on the primary roller 43 which is connected to the Gear 201, 201 'on the friction rollers 45, 45' cooperates to the To drive friction rollers 45, 45 'in this way.
  • the inking rollers 44, 44 'and the Transfer rollers 46, 46 ' are preferably in frictional contact with the primary Roller 43 or the friction rollers 45, 45 'driven.
  • the plate cylinders 30a, 30b or 30c can be frictionally contacted with the blanket cylinder 20 (if the Blanket cylinder 20 is driven by the motor 7) or with the Ink application rollers 44, 44 'are driven; or the blanket cylinder 20 can are driven via frictional contact with the plate cylinder 30a, 30b or 30c (if the plate cylinder 30a, 30b or 30c is driven by the motor 7).
  • Farther can between the plate cylinder 30a, 30b or 30c and the blanket cylinder 20th Not shown gear can be provided, via which the two cylinders driven become.
  • the lower half of the printing press (not shown here) can be used in the same way like the inking roller train 40 and the cylinder drive devices 5, 6, 7 can be formed.
  • the lower blanket cylinder 10 can print through on one side an impression cylinder to be replaced.
  • the ductor 41 rotates at a speed at which a constant color film over a narrow gap is transferred to the metering roller 42, as z. B. at the Heidelberg M-3000 TM web-fed rotary press and other web-fed offset presses State of the art.
  • the surface speed of the Metering roller 42 is z. B. via gear or a drive motor 5a, which is a known Speed feedback and position adjustment system includes, controlled so that they match the printing speed (i.e., the surface speed of the Plate cylinder).
  • the print speed, i. H. said Surface speed is through the entire inking roller 40 by a maintain appropriate choice of gear ratios and roller diameters. A strong damping, the z. B.
  • the inking roller train 40 may be arranged to be around the primary roller 43 is pivotable, the z. B. is arranged after the metering roller 42.
  • the ink roller 40 may comprise two parts, one to the right of the primary roller 43 consisting of the Rollers 44, 45 and 46, and one to the left of the primary roller 43 consisting of the Rollers 44 ', 45' and 46 '.
  • the right and left parts can e.g. B.
  • the primary Roller 43 can be pivoted by acting on arms 100 and 101 (which are shown schematically in FIGS. 1a-1c are shown) are mounted, which are pivotally mounted about the center C.
  • Fig. 1a shows the position of the Arms 100, 101 when using the smallest plate cylinder 30a in which the Transfer rollers 46, 46 'almost touch and the inking rollers 44, 44' den Contact plate cylinder 30a at a 180 ° angle.
  • Fig. 1b shows a medium-sized plate cylinder 30b
  • Fig. 1c shows the position of the Arms 100, 101 when using the largest plate cylinder 30c in which the Friction rollers 45, 45 'almost touch the plate cylinder 30c.
  • the inking roller train 40 connects the metering roller 42 to the plate cylinder 30a, 30b or 30c, within geometric constraints regardless of the size of the used plate cylinder 30a, 30b or 30c, and the inking roller 40 is with driven at a suitable speed to transfer enough color so that a Image to be transferred to the blanket cylinder 20 is colored.
  • rollers of the inking roller 40 need not be in line, i. H. You do not have to be arranged so that the axes of rotation of the rollers by means of a straight line can be connected.
  • 2 and 3 show embodiments in which the rollers of the ink roller 40 are not in a line. This will be possible if the arms 102, 103, 104 and 105 used are not straight. These arrangements can be advantageous because they can be adapted to larger printing cylinders 30 than that Embodiments in Fig. 1a-1c.
  • Figs. 2-4 show another arrangement in which the shape and the position of the arms 102, 103, or 104, 105 or 106, 107 are designed so that the Axis of the plate cylinder 30 by a distance O relative to the axis of the Blanket cylinder 20 can be moved.
  • This arrangement can also be used for larger ones Plate cylinder 30 can be used. Since the geometrical arrangement of the rollers of the Ink roller 40 not to certain conditions such. B. linear connections or certain roller diameter is bound, any suitable arrangement can to get voted. The possibilities are not those shown in Figs. 1a-1c and 2-4 Orders limited.
  • the arms 100, 101 or 102, 103 or 104, 105 or 106, 107 include any suitable number of rolls necessary to to ensure effective ink transfer to the plate cylinder 30.
  • the gears 200, 201, 201 ' are not shown in FIGS. 2-4.
  • each of the rollers 44, 44 ', 45, 45', 46, 46 ' can also be adjusted in this way be arranged so that optimal contact and pressure is created between the rollers to a to ensure optimal color transfer. This can be done through appropriate Pressure control devices 5.1, 5.1 ', 5.2, 5.2', 5.3, 5.3 '(see Fig.
  • the axes of these rollers can be arranged so that they are relative to the arms 100, 101 or 102, 103 or 104, 105 or 106, 107 allow sideways movement, whereby Pressure control devices 5.1, 5.1 ', 5.2, 5.2', 5.3, 5.3 'control this movement and one Apply force to press the rollers against each other.
  • the Pressure control devices 5.1, 5.1 ', 5.2, 5.2', 5.3, 5.3 'can, such as. B. shown in Fig. 5b is made of springs or any other known device for generating a resilient force, such as B. from an air cylinder.
  • the inking unit is adjustable so that the Circumferential surfaces of the inking rollers 44, 44 ', the plate cylinder 30, the Friction rollers 45, 45 ', the transfer rollers 46, 46', and the primary roller 43 optimal interact.
  • the inking rollers 44, 44 ' can also be close to Plate cylinders 30 may be arranged in such a way that they rotate when the rollers rotate automatically apply to the plate cylinder 30 to transfer to this color.
  • the plate cylinder 30 is preferably exchangeable on a frame 400 arranged using plate cylinders 30a, 30b, 30c, etc. of different sizes can be.
  • a pressure control device similar to that Pressure regulators 5.1, 5.1 ', 5.2, 5.2', 5.3, 5.3 ' can be used to Adjust the position of the axis of the plate cylinder relative to the blanket cylinder 20 (to allow the use of plate cylinders 30 of different sizes) and to a sufficient contact pressure between the plate cylinder 30 and both To produce blanket cylinder 20 and the inking rollers 44, 44 '.
  • the Frame 400 has a bearing for the axis of the plate cylinder 30, depending on the size of the plate cylinder 30 towards the blanket cylinder 20 and moved away from it can.
  • the blanket cylinder 20 can also be replaced in a frame 500 be arranged, whereby blanket cylinders 20 of different sizes are used can.
  • a pressure control device 7.1 which is similar to the Pressure regulating devices 5.1, 5.1 ', 5.2, 5.2', 5.3, 5.3 ', 6.1 can be designed for this purpose the position of the axis of the blanket cylinder 20 relative to the web 2 to change the use of blanket cylinders 20 different sizes too enable, as well as a sufficient contact pressure between the To produce blanket cylinder 20 and the plate cylinder 30.
  • the Frame 500 be designed so that this is a bearing for the axis of the Has blanket cylinder 20, which depending on the size of the blanket cylinder 20 the web 2 is movable towards and away from it.
  • An endless, tubular rubber blanket is preferably used as the rubber blanket 21, which is designed in such a way that no non-printing areas arise.
  • the sleeve-shaped rubber blanket can e.g. B. can be produced in that an endless Blanket or blanket on a sleeve made of plastic or metal is applied.
  • the sleeve-shaped Blowing air axially onto the base body of the blanket cylinder 20 with the aid of blown air applied. Due to the lack of gap in sleeve-shaped rubber blankets, as z. B. in conventional flat blankets around the blanket cylinder wrapped around and attached with their ends to the cylinder occurs at these sleeve-shaped rubber blankets a transfer of color over 360 ° cylindrical surface so that no non-printing areas arise.
  • the size of the blanket cylinder 20 can be set and the surface speed (i.e. the surface speed of the on the Blanket cylinder 20 attached blanket 21) to the average
  • the speed of the inking rollers 44, 44 'must be matched. So he can Diameter of the blanket cylinder 20 in relation to factors such as mounting, Speed of rotation, service life, heat transfer and cooling features, dynamic Stability, etc. can be optimized.
  • the diameter of the blanket cylinder 20 is not integer multiple of the diameter of the plate cylinder 30.
  • the Blanket cylinder 20 does not have to be replaced if plate cylinder 30 with different section lengths (i.e. with different diameters) into the Printing unit 1 can be installed.
  • the surface speeds of the Plate cylinder 30 and the blanket cylinder 20 to be matched to one another To prevent smudging or circumferential distortion of the image if color is transferred from the plate cylinder 30 to the blanket cylinder 20. If the surface speeds are not coordinated, occurs in the range of Gap between the blanket cylinder 20 and the plate cylinder 30 slip, which leads to smearing of the transferred print image.
  • Blanket 21 can be such. B. act a loose sleeve, the frictional contact is coupled to the plate cylinder 30.
  • the blanket cylinder 20 z. B. be provided at the ends with a toothing with a similar toothing the outer surface of the plate cylinder 30 can cooperate, the The solution described does not behave in principle differently than a solution in which everyone driven pressure gaps there is no slip to web 2. Because of the negligible slip between the blanket 21 and the associated driven roller or the associated driven cylinder, it is also possible to use band-like rubber blankets. An embodiment with a band-like Blanket is shown in Fig. 7. Instead of one as shown in Figs.
  • 1a-1c and 2-4 sleeve-shaped rubber blankets are the band-like rubber blankets 611, 621 Blanket cylinders 10 and 20 and guided over guide rollers 600 and 601.
  • the band-like blankets 611, 621 move around the blanket cylinders 10, 20 and the guide rollers 600, 601 around and transfer in the same manner as that previously described blankets an image of the impression cylinder 30 on the web 2nd
  • a printing unit 1 for printing with different Section lengths designed so that only the plate cylinder 30 has to be replaced, to change the section length while the blanket cylinder 20 in the printing unit 1 can remain.
  • the plate cylinder 30 - regardless of its size - is always like this positioned that its circumference is in rolling contact with the blanket cylinder 20.
  • This z. B. achieved by means of a gap or a slot with a bearing housing which in Frame 400 is arranged and one depending on the size of the plate cylinder 30 Adjustment of the axis of the plate cylinder 30 relative to the blanket cylinder 20 allows.
  • Another way to change the size of the plate cylinder 30 is in applying sleeves of different thicknesses to the plate cylinder 30.
  • a Device and a method for adjusting the plate cylinder diameter in the previously described manner is e.g. B. described in US-A-5813336.
  • a printing press usually comprises several printing units, whereby each printing unit prints with a different color.
  • the correct phase rotation of the Plate cylinder 30 can, for. B. be maintained by the fact that the pressure of the The drive of the plate cylinder is changed by one or more of the Pressure control devices 5.3, 5.3 ', 6.1, 6.1' or 7.1 can be adjusted. So z. B. by a reduction in pressure slows the rotation of the plate cylinder 30, resulting in Making a register setting can be used.
  • the speed of the Ink roller 40 is preferably kept constant, so that with each Rotation of the plate cylinder 30 transmit a substantially constant volume of color becomes.
  • the inking roller 40 can be used to relative to the plate cylinder 30 Blanket cylinder 20 or to the material web 2 in the manner described above to change the register setting of the plate cylinder 30. Thereby the images on the material web can be held in register from printing unit to printing unit be aligned.
  • the blanket cylinder 20 may be slightly close the blanket cylinder 20 speed up or slow down to a printed image of a different signature format adapt. If the blanket cylinder 20 is slowed down relative to the plate cylinder 30, each time the plate cylinder 30 rotates, an image is printed on the web 2 that is slightly smaller than the circumference of the plate cylinder 30 Blanket cylinder 20 is accelerated relative to the plate cylinder 30 at each Rotation of the plate cylinder 30 an image printed on the web 2, which is slightly larger than the circumference of the plate cylinder 30. This image is distorted in the direction in which the material web 2 moves. This distortion can be compensated for by the Prepress an opposite distortion into the image on plate cylinder 30 is installed.
  • the material web 2 is thus printed with a non-distorted image. Is z. B. changed the section length by the speed of the Plate cylinder 30 is reduced by 5% relative to the blanket cylinder 20, so the image on the plate enlarged or elongated by 5%, being in the direction of movement the path 2 circles and points to ovals and squares to rectangles.
  • the technique of introducing distortion into the plate cylinder 30 described above can be used as another method of printing with variable section lengths become and is suitable for. B. for minor changes in section length in Range up to 5%.
  • the main method of printing with variable section lengths is, however, with the plate cylinder 30 against another plate cylinder 30 different diameters.
  • Another aspect of the present invention relates to the removal of latent ones Images on the blanket cylinder 20, known in offset printing as so-called "Doubling" appear.
  • the removal of latent images takes place in the manner according to the invention in that the Paint is peeled off or peeled off the blanket without causing back splitting the color is coming.
  • This can e.g. B. can be achieved in that a suitable color Water base is used in combination with a rubber blanket, the Surface material has a very small polar surface energy, e.g. B. less than 0.004 N / m (4 dynes / cm), so that a maximum total surface energy of is less than 0.014 N / m (14 dynes / cm).
  • a suitable material can e.g. B. Teflon (PTFE) or silicone.
  • Fig. 6 shows part of a sleeve-shaped rubber blanket 21, which on the Blanket cylinder 20 is arranged.
  • the blanket 21 includes one Surface layer 22, which contains PTFE as a component.
  • the surface layer 22 the rubber blanket 21 can, for. B. contain PTFE powder 23, the whole Basic structure 24, which is preferably made of rubber, is distributed.
  • the PTFE powder 23 can alternatively be replaced by silicone powder.
  • the PTFE or silicone powder 23 makes preferably more than 50% of the volume of the surface layer 22.
  • the PTFE or Silicone powder particles are preferably between 0.1 ⁇ m and 1.0 ⁇ m in size.
  • the Rubber blanket 21 can comprise further layers below the surface layer 22, z. B. a volume compressible layer 25, a lower rubber layer 26 and one Sleeve layer 27, the z.
  • B. can be made of nickel or a plastic. This additional layers are known and z. In US 5,323,702 and US 5,304,267 described.
  • the sleeve layer 27 can, for example, over the outer surface of the Slide blanket cylinder 20. Alternatively, PTFE tape on the surface of the Blanket 21 can be used.
  • PTFE or silicone according to the invention on the surface of the Blanket 21 in connection with a suitable color, e.g. B. the aforementioned color water-based, there is an almost 100% color transfer from the plate cylinder 30 to the Blanket cylinder 20 and then from the blanket cylinder 20 to the Material web 2, without causing color splitting and an associated Duplication in the printed image is coming. Since on the rubber blanket 21 of the Blanket cylinder 20 thus no longer has a latent image, it is no longer required the position of the blanket cylinder 20 and the plate cylinder 30 at each To coordinate or synchronize rotation exactly, as is the case with Printing machines of conventional design is required.
  • a suitable color e.g. B. the aforementioned color water-based
  • Plate cylinders 20 and blanket cylinders 30 are of different diameters Differences in rotational speed are permitted to such an extent as long as the Surface speeds are roughly matched and an acceptable one Print quality is achieved, however, the speed range compared to conventional printing presses is considerably larger, so that the invention Device in particular for the use of direct imaging methods for imaging the printing plate or the printing plate cylinder, e.g. B. by means of a laser, where a new print image by the direct imaging unit, preferably for each Rotation of the plate cylinder is generated again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (18)

  1. Machine à imprimer offset rotative à bobines, destinée à imprimer avec une longueur de segment variable, comprenant un cylindre porte-blanchet (20) qui porte un blanchet (21), un cylindre porte-plaque (30, 30a, 30b, 30c) variable en dimension, portant une plaque d'impression (31) et qui est interchangeable pour la variation de la longueur de segment, ou encore équipé pour recevoir des manchons (11, 21) de différentes épaisseurs, et comprenant un mécanisme d'encrage (40) qui comprend lui-même un rouleau toucheur d'encrage (44, 44') qui peut être mis en pression contre le cylindre porte-plaque (30, 30a, 30b, 30c) dans différentes positions,
    caractérisée en ce que le rapport des diamètres entre cylindre porte-plaque (30, 30a, 30b, 30c) et cylindre porte-blanchet (20) n'est pas un nombre entier, et
    en ce que le blanchet (21) possède, pour le report pratiquement total de l'encre sur une bande de matière (2), une couche superficielle (22) faite d'une matière à faible énergie superficielle polaire.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que la couche superficielle (22) contient un fluoropolymère, en particulier du polytétrafluoréthylène ou du silicone.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que la couche superficielle (22) contient au moins 50% de poudre de polytétrafluoréthylène (23) dans une structure de base (24) en caoutchouc.
  4. Dispositif selon une des revendications 1 à 3,
    caractérisé en ce que le blanchet (21) possède une surface d'impression sans fin.
  5. Dispositif selon la revendication 4,
    caractérisé en ce que le blanchet (20) est un blanchet (21) en forme de manchon.
  6. Dispositif selon une des revendications précédentes,
    caractérisé en ce que le cylindre porte-plaque (30, 30a, 30b, 30c) est monté rotatif dans le bâti (400, 500) de la machine à imprimer de façon à pouvoir être remplacé par un autre cylindre porte-plaque possédant un diamètre différent, la position des rouleaux toucheurs d'encrage (44, 44') pouvant être modifiée de manière qu'ils se trouvent en contact roulant avec l'autre cylindre porte-plaque (30, 30a, 30b, 30c).
  7. Dispositif selon une des revendications précédentes,
    caractérisé en ce que le mécanisme d'encrage (40) comprend en outre un roulcau primaire (43) monté rotatif et en ce que le cylindre porte-plaque (30, 30a, 30b, 30c) peut être déplacé de manière que la distance entre le centre de rotation (C) du rouleau primaire (43) et le centre de rotation du cylindre porte-plaque (30, 30a, 30b, 30c) soit variable.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que le mécanisme d'encrage (40) comprend en outre un rouleau de report (46, 46') pouvant être mis en pression contre le rouleau primaire (43), ainsi qu'un rouleau baladeur (45, 45') pouvant être mis en pression contre le rouleau de report (46, 46'), et un rouleau toucheur d'encrage (44, 44') qui peut être mis en pression contre le rouleau baladeur (45, 45').
  9. Dispositif selon la revendication 8,
    caractérisé en ce que le rouleau de report (46, 46') et/ou le rouleau baladeur (45, 45') et/ou le rouleau toucheur d'encrage (44, 44') sont disposés sur un bras (100-107).
  10. Dispositif selon la revendication 9,
    caractérisé en ce que le bras (100-107) est disposé pour pivoter autour du rouleau primaire (43) de telle manière que la position du rouleau toucheur d'encrage (44, 44') par rapport au cylindre porte-plaque (30, 30a, 30b, 30c) soit variable.
  11. Dispositif selon la revendication 3,
    caractérisé en ce que les particules de poudre présentent une grosseur contenue dans l'intervalle entre 0,1µm et 1,0µm.
  12. Dispositif selon une des revendications précédentes,
    caractérisé en ce que l'encre transférée du mécanisme d'enorage (40) au cylindre porte-plaque (30, 30a, 30b, 30c) est une encre à base d'eau.
  13. Emploi d'un blanchet comprenant une première couche cylindrique (27) en forme de manchon, une couche intermédiaire compressible (25) et une couche superficielle (22) disposée sur la couche intermédiaire compressible (25) et faite d'une matière possédant une faible énergie superficielle polaire, dans une machina à imprimer offset rotative à bobines selon une des revendications 1 à 12.
  14. , Emploi selon la revendication 13,
    caractérisé en ce que l'énergie superficielle polaire vaut moins de 14 x 103 N/m.
  15. Emploi selon la revendication 13 ou 14,
    caractérisé en ce que la couche superficielle (22) contient du polytétrafluoréthylène ou du silicone.
  16. Emploi selon une des revendications 13 à 15,
    caractérisé en ce que la couche superficielle (22) comprend une structure de base (24) en caoutchouc avec de la poudre de polytétrafluoréthylène(23) incorporée dans ce dernier,
  17. Emploi selon la revendication 16,
    caractérisé en ce que la proportion de poudre de polytétrafluoréthylène (23) vaut au moins 50%.
  18. Emploi selon la revendication 17,
    caractérisé en ce que les particules de la poudre de polytétrafluoréthylène (23) ont une grosseur comprise dans l'intervalle d'entre 0,1µm et 1,0µm.
EP99107377A 1998-05-15 1999-04-22 Blanchet pour l'impression avec transfert complet de l'encre Expired - Lifetime EP0956973B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/080,073 US6041706A (en) 1998-05-15 1998-05-15 Complete release blanket
US80073 1998-05-15

Publications (3)

Publication Number Publication Date
EP0956973A2 EP0956973A2 (fr) 1999-11-17
EP0956973A3 EP0956973A3 (fr) 2000-02-23
EP0956973B1 true EP0956973B1 (fr) 2003-07-30

Family

ID=22155093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99107377A Expired - Lifetime EP0956973B1 (fr) 1998-05-15 1999-04-22 Blanchet pour l'impression avec transfert complet de l'encre

Country Status (4)

Country Link
US (1) US6041706A (fr)
EP (1) EP0956973B1 (fr)
JP (1) JPH11342583A (fr)
DE (1) DE59906409D1 (fr)

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US6672211B2 (en) * 1999-03-03 2004-01-06 James F. Price Inking systems for printing presses
US6895861B2 (en) * 2003-07-11 2005-05-24 James F. Price Keyless inking systems and methods using subtractive and clean-up rollers
US6543350B2 (en) * 2000-05-19 2003-04-08 Intelligent Sensing, Inc. Measurement system to monitor printing contact pressure
DE10063171A1 (de) * 2000-12-18 2002-06-20 Heidelberger Druckmasch Ag Zylindermantelprofil
US7216585B2 (en) * 2001-01-24 2007-05-15 Goss International Americas, Inc. Shaftless motor drive for a printing press with an anilox inker
DE10256173A1 (de) * 2002-09-06 2004-03-18 Koenig & Bauer Ag Farbwerke von Rotationsdruckmaschinen
EP1442878A1 (fr) * 2003-02-03 2004-08-04 Kba-Giori S.A. Entraínement du dispositif d'encrage dans une machine d'impression en creux
EP1708945B1 (fr) * 2004-01-31 2012-07-04 Koenig & Bauer AG Presse comprenant au moins un element d'impression pour imprimer en offset une bande de matiere a imprimer avec une longueur de decoupe variable et une plieuse
US20070079714A1 (en) * 2005-10-10 2007-04-12 Atwater Richard G Upgrade kit for offset printers
EP2033785B1 (fr) * 2006-05-23 2013-01-09 Koenig & Bauer Aktiengesellschaft Agencement dans une unité d'impression d'une presse rotative
DE102006030057B4 (de) * 2006-05-23 2009-12-24 Koenig & Bauer Aktiengesellschaft Farbwerk einer Rotationsdruckmaschine
EP1932667A1 (fr) * 2006-12-15 2008-06-18 Müller Martini Holding AG Unité d'impression pour une presse rotative à format variable
KR101291878B1 (ko) * 2007-02-06 2013-07-31 엘지디스플레이 주식회사 롤러 장치, 인쇄 방법 및 이를 이용한 액정표시장치의 제조방법
JP2010524746A (ja) * 2007-05-01 2010-07-22 ゴス インターナショナル アメリカス インコーポレイテッド 異なる一定のカットオフを備えた印刷機及び方法
DE102007034835A1 (de) * 2007-07-26 2009-01-29 Robert Bosch Gmbh Verfahren zum Betreiben einer wellenlosen Druckmaschine und wellenlose Druckmaschine
FR2930767B1 (fr) * 2008-04-30 2011-05-13 Goss Int Montataire Sa Cylindre de transport d'une feuille, dispositif de transport presse d'impression et utilisation correspondants
DE102009018476A1 (de) * 2008-05-15 2009-11-19 Heidelberger Druckmaschinen Ag Phasenrichtiges Einkuppeln unterschiedlich touriger Zylinder
US8544385B2 (en) * 2008-05-15 2013-10-01 Goss International Americas, Inc. Printing press with different fixed cutoffs and method
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Also Published As

Publication number Publication date
US6041706A (en) 2000-03-28
EP0956973A2 (fr) 1999-11-17
DE59906409D1 (de) 2003-09-04
JPH11342583A (ja) 1999-12-14
EP0956973A3 (fr) 2000-02-23

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