EP2388136B1 - Elément d'impression combiné - Google Patents

Elément d'impression combiné Download PDF

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Publication number
EP2388136B1
EP2388136B1 EP20100163341 EP10163341A EP2388136B1 EP 2388136 B1 EP2388136 B1 EP 2388136B1 EP 20100163341 EP20100163341 EP 20100163341 EP 10163341 A EP10163341 A EP 10163341A EP 2388136 B1 EP2388136 B1 EP 2388136B1
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EP
European Patent Office
Prior art keywords
printing
printing device
colour
color
printed
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.)
Not-in-force
Application number
EP20100163341
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German (de)
English (en)
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EP2388136A1 (fr
Inventor
Matthias Riepenhoff
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.)
Wifag Maschinenfabrik AG
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Wifag Maschinenfabrik AG
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Priority to EP20100163341 priority Critical patent/EP2388136B1/fr
Publication of EP2388136A1 publication Critical patent/EP2388136A1/fr
Application granted granted Critical
Publication of EP2388136B1 publication Critical patent/EP2388136B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/46—Printing units for inserting latest news
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/0057—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material where an intermediate transfer member receives the ink before transferring it on the printing material

Definitions

  • the invention relates to a printing machine, in particular a rotary printing machine, for example a web-fed printing press or web-fed rotary printing press, in particular a printing press for the newspaper printing or the printing of daily newspapers in, for example, a large circulation.
  • the printing machine according to the invention can be printed, for example, in the offset process, preferably in the wet printing process.
  • the printing press according to the invention has the features of the main claim, is thus used in particular in multi-color printing and preferably represents a combination printing unit.
  • a printing unit In industrial newspaper production, a printing unit is usually used for each color and web page, which can print several pages next to each other simultaneously, depending on the machine type.
  • a printing forme cylinder such as a plate cylinder of the printing unit several printing plates or printing plates are mounted side by side or in the scope one behind the other usually.
  • a large number of printing plates must be produced and mounted on the appropriate cylinder in the right place.
  • the printing forms of the affected newspaper pages are changed, for which a stoppage of the printing press is necessary.
  • the more printing forms that have to be changed the greater the downtime. Downtimes and errors in the assembly of printing plates reduce productivity and lead to increased costs.
  • an additional printing device in particular an inkjet printing device or an inkjet print head can be used to apply a part of the printed image to the substrate to be printed.
  • DE 10 2006 016 065 A1 discloses an auxiliary printing device for an offset printing principle printing machine having the form of an inkjet printing system.
  • an inkjet print head is arranged on a traverse transversely to the printing direction in a working position to a paper web within the printing press in one or at least close to a printing unit.
  • This additional device is variable for printing, provided during a print run often changing information.
  • US 2005/0193911 A1 and US 2009/0056578 A1 disclose web-fed rotary printing presses with an additional inkjet printing device, the inkjet printing device transferring a varnish to a finished printed substrate.
  • US 5,906,156 discloses a rotary printing machine having an ink jet printing apparatus, wherein the ink jet printing apparatus can transfer different colors.
  • the invention has for its object to provide a printing machine for multicolor printing, in particular a printing machine for the multicolor newspaper printing, which allows for the preservation of an acceptable print quality and printing speed, a saving of printing plates (in particular printing plates).
  • a color separation is understood in particular a negative or slide obtained by recording with a corresponding color separation filter.
  • a color separation represents a print template which consists of the information for a print image to be printed in a base color or a print image part to be printed in a base color.
  • a color separation therefore only includes those in one of the different Basic colors, for example cyan, magenta, yellow or black, print information to be printed.
  • color separations are created from different color separations, which as bitmaps represent a digitization of the information contained in a color separation.
  • a color separation may, for example, be an unscreened halftone image.
  • a different raster method can be used for each color separation.
  • different color separations may be printed with the same screen ruling and the screen angles customary in multicolor printing, but with the same resolution.
  • it is also possible to use different screening methods for each color separation in particular autotypical screening methods, stochastic screening methods or hybrid screening methods in which different of the aforementioned screening methods are combined.
  • the color separations of the different colors together can also yield a multicolored print image, like the DE 10 2008 012 385 A1 this is taught in terms of the composition of the printed image of different colors.
  • the printing machine according to the invention is set up for multicolor printing, thus enabling printing in several printing inks, in particular cyan, magenta, yellow and black. According to the invention it is also possible to set up the printing press such that only a subset of these primary colors is printed.
  • the printing press can therefore be used to print a colorful or unbunted printed image.
  • subsets of the colorful printing inks cyan, magenta and yellow neutralize each other and thus form achromatic colors, such as black and gray tones.
  • an unattached print image also called black buildup
  • it is intended to print a separate color separation consisting of black printing ink for the corresponding unblank values.
  • the at least one first printing device with a printing form preferably comprises at least one printing unit with a plate cylinder and a transfer cylinder, in particular also two, be provided three or four printing units.
  • the printing units are advantageously arranged in a printing tower.
  • the first printing device comprises a printing plate, that is to say preferably an impact printer, operates, for example, on the principle of a rotary printing press, for example a rotary printing press or rotary printing press or offset printing press, but can also operate on the principle of a printing press operated in high or low pressure.
  • the first printing press it is also possible for the first printing press to operate on the principle of screen printing.
  • the printing form thus has the function of a template for the printed image, wherein the printed image applied by means of the printing form preferably does not change in an edition of the printed copy, in particular therefore in a newspaper edition.
  • a change of the transmitted by the first printing device print image or printed image part thus makes a change of the printing form or a change of the image information of an erasable printing form necessary.
  • the first printing device is provided for transmitting a first color separation of a first color, in particular a base color.
  • the base color is advantageous one of the colors cyan, magenta, yellow and black.
  • each of the printing form printing devices transmits a different color separation, in particular a color separation, which differs in color from the color separations of the other printing plate printing devices on.
  • a "different" color separation or a "different” color designate, in particular, a color separation or a color that is in particular in the shade of another color separation or another color and / or color separations or other colors differ.
  • the first printing device comprises in particular at least one printing unit, which can print several pages at the same time, depending on the type of machine, a plurality of printing plates or printing plates are usually mounted side by side or circumferentially one behind the other on a plate cylinder.
  • the printing form is preferably an erasable printing form.
  • an erasable printing form may be a printing form, on the surface of which a polymer layer is present, which contains the information to be printed, and through physical or chemical processes can be neutralized, that can be put into a state in which it no longer has pressure information.
  • the further, second printing device is a pressure-formless printing device (that is to say a printing device which does not comprise a printing form), which works in particular in a printing process according to the principle of non-impact-printing (NIP), that is to say without a solid printing form (for example, without printing cylinder or stamp). gets along.
  • the second printing device is preferably an inkjet printer (inkjet printer), a printer operating on the principle of electrophotography (for example a laser printer) or a thermal printer.
  • the second printing device works advantageously according to another printing principle or is of a different kind than the first printing device.
  • the printing press according to the invention is therefore in particular a combination printing unit comprising at least two printing devices of different types or different functional principles.
  • the second color separation of another, second color transmitted by the second printing device is in particular a color separation whose color is not applied by the first printing device. If a plurality of first printing devices are arranged in the printing press according to the invention, advantageously none of the first printing devices prints a color separation in the second color. If a plurality of second printing devices are arranged in the printing press according to the invention, they can be of the same type or even different, in particular, of the abovementioned printing-form-free types of printing devices.
  • the second printing devices can then each print a different color separation or the same or in each case a part of the same color separation. These color separations or parts of the color separation are then not printed by the first printing device or one of the first printing devices. In particular, therefore, no first printing device prints a second color separation of the other, second color and none second printing device a color separation of the first color.
  • the set of second colors is not a subset of the first colors.
  • the printing image to be printed by the printing machine according to the invention is thus composed of a plurality of color separations or color separations, wherein the first printing device and the second printing device are arranged to transmit different color separations or color separations.
  • the color separation, which is transmitted from a second printing device preferably differs in color from all color separations, which are transmitted by means of a first printing device.
  • the invention therefore has the advantage that one of the base paints usually applied by means of a first printing device is applied exclusively by means of a second printing device, the second printing device having no printing forme.
  • This makes it possible to save a printing form in the printing press according to the invention and thus also the saving or shortening of interruptions in operation which become necessary when the printing form changes due to a change in the printing form.
  • the use of the second printing device according to the invention has the further advantage that the number of offset printing units can be reduced compared to the prior art and thus a reduction of the printing plates to be produced and mounted is made possible.
  • a color separation of such a color is transmitted by means of the second printing device.
  • the output resolution of the second color separation is reduced compared to that of the first color separation, a sufficient quality of the print image to be transmitted by means of the second printing device can also be supported by means of an inkjet method.
  • the yellow color separation ie a color separation of a color in the yellow wavelength range
  • a color separation of a colored color is advantageously transmitted by means of the second printing device.
  • the newspaper printing is usually a autotypical grid with screen frequencies of about 40 1 / cm to about 48 1 / cm.
  • the screening is preferably carried out for each ink with a certain screen angle.
  • the grids of each color are rotated by 60 ° to each other. Since it is not possible to shift the screen angle by 60 ° for all four inks, there is one exception: Yellow is rasterized at an angle of 0 °. The moire effect between the yellow grid and the grids of the other color separations is not perceived as disturbing by the human eye.
  • the absorption range of the yellow ink is in the short-wavelength range of the visible spectrum, in which the receptors of the eye are less sensitive.
  • the yellow color is preferably applied by the second printing device.
  • the resolution of the print image or color separation to be transferred with the second printing device differs from the resolution of the part of the print image or color separation to be transferred by means of the first printing device, ie, the resolution of a print to be applied in yellow (In particular, each individual) to be transmitted by the first printing device print image.
  • the resolution of the second Printing device to be transmitted print image or color separation less than the print device to be transmitted by the first printing device or color separation or the means of the first printing device to be transferred print images or color separations, if the printing machine comprises a plurality of first printing devices.
  • the second printing device comprises at least one inkjet printhead or inkjet printhead, for example, it may be an inkjet printhead, which according to the continuous inkjet principle, the drop-on-demand inkjet principle, the thermal Inkjet principle, the bubble inkjet principle or any other inkjet principle works.
  • An advantage of the inkjet method over the offset method is that no printing form is produced, mounted and changed to change the print image to be transferred from the inkjet print head. Inkjet printheads can be made more compact and lighter than offset printers.
  • a print head of the second printing device is arranged in the direction of rotation of the printing cylinder between a contact point of the printing cylinder with the transfer cylinder and the substrate to be printed.
  • the print head is mounted on a position of the printing cylinder, which lies in the direction of rotation of the printing cylinder between the contact point and the substrate or the transport path of the substrate.
  • all color separations i.e., both the color separations transferred by the second printing device and those transferred by the first printing device
  • the color separation transferred from the second printing device is advantageously printed with a lower resolution than the color separation transferred from the first printing device.
  • the printing press in particular has a plurality of second printing devices each with in particular three print heads, wherein each print head is advantageously set up to print another color ink.
  • the first printing device is then set up for printing with black ink (especially exclusively black ink).
  • the printheads are each a second printing device then set up their colors on a common
  • Transfer transfer cylinder In this case, different second colors can be transferred to the common transfer cylinder. In the context of the invention, however, it is also possible for a second printing device to apply its color to a separate transfer cylinder individually assigned to each print head of a second printing device. In particular, at least one print head of a second printing device prints on a transfer cylinder, advantageously a transfer cylinder of a first printing device.
  • the printing by means of the second printing device can also be done directly on a substrate to be printed.
  • a guide element for the web for. B. to use a guide roller that keeps the distance between the paper web and inkjet printhead constant.
  • the application of the ink by an inkjet printhead takes place, for example, in a region in which the web wraps around the guide roll, or at least in the vicinity of the contact region of the guide roll and the web.
  • the color of at least one color separation of another, second color is applied to the same transfer cylinder of a first printing device in which a color separation of a first color is printed by means of the second printing device.
  • the second printing device comprises a plurality of print heads with nozzles or output devices.
  • a print head advantageously comprises a plurality of output devices in the form of print nozzles.
  • An inkjet printhead may for example consist of elements perpendicular to the web transport direction, but in the web transport direction but offset from each other elements, wherein an element is an arrangement or grouping of advantageous multiple inkjet nozzles.
  • the inkjet nozzles can also be arranged, for example, at an angle, in particular at an acute angle to the web transport direction, in order to achieve a higher resolution.
  • at least one nozzle is provided for each position transversely to the web transport direction, which can apply paint to the web at this position.
  • the way to one in particular web-width print head combined elements thus form a print line, although the pressure nozzles belonging to the line do not necessarily have to be in line.
  • an inkjet element has 1000 nozzles that are in line with each other at intervals of 100 ⁇ m between the nozzles.
  • An element may be oriented so that the nozzles are arranged in a line transverse to the direction of web travel.
  • 13 elements are needed, which are summarized in a print head.
  • the nozzle spacing across the web transport direction is 70.7 microns, it is for a 127Q mm wide web 18 mm needed and the resolution is then 359 dpi.
  • the second printing device may have multiple printheads for different colors, but multiple printheads may print the same color. At least one printhead is required for each color to be printed.
  • the printing machine according to the invention is adapted to apply the second color, in particular a colored ink to a transfer cylinder, in particular a transfer cylinder for black color.
  • a transfer cylinder on which also the first printing device applies a color.
  • the color spots of the printed image applied with the second printing device can be arranged with a predominantly surface part only in non-ink spots of the printed image transferred with the first printing device.
  • the first and second colors are spatially separated in this sense.
  • the first and the second color are separated from each other over an at least predominant surface portion of the print image formed jointly by them so that they have no overlap there. More preferably, they have no overlaps at all.
  • Color spots of the first color and color spots of the second color can collide laterally.
  • the inking of the second printing device is preferably carried out in the direction of rotation of the transfer cylinder after the inking of the first printing device and before the contact of the transfer cylinder with the substrate.
  • the first and the second color separation are applied to the same substrate, in particular to the same side of a substrate.
  • Also part of the invention is a method for printing a printed image composed of a plurality of color separations according to claim 14. Further features of the method can be formulated according to the device features of the printing machine described above. In particular, the printing machine described above is set up to carry out the method according to the invention.
  • FIG. 1 is a printing machine 10 for printing a substrate 2 with three first printing devices, each in the form of a printing unit 30, 40, 50 shown. Further, two second printing devices 60, 70 are provided with two and three ink-jet printheads 61, 71 for direct printing of the substrate 2, respectively.
  • the substrate 2 has a web shape, is in particular a roller conveyor, preferably made of paper.
  • the printing units 30, 40, 50 are provided for double-sided printing of the substrate 2, so that each plate cylinder 32, 32 '; 42, 42 '; 52, 52 'and transfer cylinders 31, 31'; 41, 41 '; 51, 51 'are symmetrical with respect to the web plane.
  • the transfer cylinders 31, 31 '; 41, 41 '; 51, 51 ' are for example rubber cylinder or blanket cylinder.
  • the printing gaps of the printing units 30, 40, 50 are formed by the opposite transfer cylinders.
  • the second printing devices 60, 70 have a plurality of print heads 61, 71, each facing a web side, so that the second printing device 60 and the second printing device 70 each print a different web page.
  • the second printing device 60 is disposed between the second printing unit 40 and the third printing unit 50 on a first web side, the second printing device 70 is disposed downstream of the third printing unit 50 on the other, second web side.
  • the first printing unit 30 is adapted to transfer the hue cyan, the second printing unit 40 to transfer the hue magenta and the third printing unit 50 to transfer the hue black.
  • the arrows indicate the direction of rotation of the transfer cylinder. The substrate 2 is thus transported in the direction from the first printing unit 30 to the second printing device 70.
  • the second printing devices 60, 70 are arranged to transmit the yellow Y color.
  • the output resolution of the yellow separation is between 100 and 600 dpi, preferably between 180 and 300 dpi.
  • the color separations black, cyan and magenta are conventionally rasterized with high resolution and printed using the offset method.
  • the output resolution of yellow is below the output resolution of black, cyan and magenta.
  • each print head 61, 71 corresponds to the maximum paper size, in particular the web width.
  • Each printhead 61, 71 is associated with a paster. In this embodiment, 25% less offset printing units are required compared to the conventional offset printing, since the printing machine 10 has no offset printing unit for the hue yellow Y.
  • the printing of this color separation is done by the second pressure devices 60, 70th
  • the second printing devices 60 ', 70' are not designed for direct printing of the substrate 2. Rather, they transfer yellow color Y to the transfer cylinders 81, 81 'of the printing unit 80 for black color K arranged on both sides of the substrate.
  • the transfer cylinders 81, 81' are driven by plate cylinders 82, 82 '.
  • the second printing device 70 'in this case has a print head for yellow color Y
  • the second printing device 60' in this case has two print heads 61 'for yellow color Y.
  • the second printing devices 60 ', 70' are again ink jet printing apparatus.
  • the print head of the second printing device 70 ' is opposite the transfer cylinder 81' at a position of the transfer cylinder 81 ', which in the direction of rotation of the transfer cylinder 81' between a contact with the black plate cylinder 82 '. and the paper web or the substrate 2 is located.
  • the print heads 61 'of the second printing device 60' are opposed to the transfer cylinder 81 at a position lying in the direction of rotation of the transfer cylinder 81 between its contact with the black plate cylinder 82 and the paper web.
  • FIG. 3 In the third embodiment of the printing press 12 according to the invention FIG. 3 in turn, like reference numbers refer to the same components as in FIGS. 1 and 2 ,
  • FIG. 1 three first printing devices in the form of printing units 30, 40, 50 are used to transfer the colors cyan C, magenta M and black K to the substrate 2. Downstream of the third printing unit 50 are arranged symmetrically to the web plane two transfer cylinders 62, 72 for yellow color Y, second printing devices 60 ", 70", which are on the preferably web remote half of the transfer cylinder 62, 72 opposite to this, apply in the inkjet printing process yellow color Y on the transfer cylinders 62, 72.
  • the second printing device 60 has four print heads 61.
  • the second printing device 70" on the opposite web side has two print heads 71.
  • the second printing devices 60 ", 70” each have only one print head 61, 71.
  • the second printing devices 60 ", 70” are each assigned a separate transfer cylinder, which is not simultaneously used by a first printing device 30, 40, 50.
  • the printheads 61, 71 for each of the two second printing devices 60 “, 70” apply the same colors (here yellow color Y), in the invention it is also possible that the printheads 61, 71 for each of the second Print devices 60 “, 70” apply a different color.
  • the print heads 61, 71 to apply different colors to a transfer cylinder 62, 72 common to each of the two second printing devices 60 ", 70” within a second printing device 60 ", 70".
  • equality is or difference in the colors applied by the second printing devices 60 ", 70" is not important to the feasibility of this embodiment.
  • at least two of the first printing devices 30, 40, 50 apply the same color, since the amount of color separations of the first printing devices and the amount of color separations of the second printing devices do not intersect and form no subset of each other.
  • the printing press 13 has two printing units 100, 200 with plate cylinder 101, 201 and transfer cylinders 102, 202 for printing a substrate 2 with black color K.
  • the impression cylinders 103, 203 are looped around by the web of the substrate 2. Downstream of a contact point between the transfer cylinders 102, 202 and impression cylinders 103, 203 (ie downstream of the printing gaps for each of the two sides of the substrate 2), the impression cylinders 103, 203 each have a second printing device 110, 210 for the printing inks Cyan C, Magenta M and yellow Y opposite.
  • the second printing device 110 again operates by the ink jet method and has print heads 104, 105, 106, 107, 108.
  • the second printing device 210 also operates by the ink jet method and has print heads 204, 205, 206, 207, 208.
  • a guide roller 109 Prior to entry into the printing nip for the first web side between transfer cylinder 102 and impression cylinder 103, a guide roller 109 is provided upstream of the first printing nip, which assists in orderly redirecting the substrate 2 into the first printing nip.
  • a guide roller 209 downstream of the second printing device 210 which prints on the other side of the web, is provided, which supports a discharge of the substrate 2 from the printing press 13.
  • every second printing device 110, 210 may comprise only one print head.
  • the chromatic colors cyan C, magenta M and yellow Y in each of the second printing devices 110, 210 are applied to the individual print heads 104, 105, 106, 107, 108 and 204, 205, 206, 207, 208, respectively
  • Each one of the printheads of a second printing device prints each one of the bright colors.
  • the printing is preferably made at a different resolution.
  • each of the two second printing devices 110, 210 is set up in order to be able to print the entirety of the three bright colors. In this embodiment, therefore, only the black K ink is printed by the offset method, and the three chromatic colors are ink jet printed by the second printing devices 110, 210.
  • a direct application of the ink from the second printing device 110, 210 takes place on the substrate 2 to be printed.
  • the distance between the surface of the substrate 2 to be printed and the print heads 104; ...; 108; 204; ...; 208 is constant for the entirety of all print heads.
  • the impression cylinders 103, 203 and the transfer cylinders 102, 202 form a rubber-steel printing unit, the impression cylinders 103, 203 acting as guide elements, in particular guide rollers for the substrate 2.
  • the guide rollers cause a constant distance of the web 2 against the print heads 104, ..., 108; 204, ..., 208 is maintained, thereby assisting in achieving the necessary quality of ink-jet printing.
  • the substrate 2 has the necessary web tension, which is supported in particular by the upstream paper roll and possibly tensioning devices at the downstream end of the printing press 13 or the paper web.
  • the individual ink jet printheads 104, ...; 108; 204, ..., 208 of a second printing device 110, 210 in the fourth embodiment have different output resolutions.
  • the printheads 104, 105 print the cyan color separation C at a resolution of 600 dpi.
  • the print heads 106, 107, 206, 207 print the magenta color separation M with a resolution of likewise 600 dpi.
  • the printheads 108, 208 print the yellow color separation at a resolution of 300 dpi.
  • FIG. 5 shows an arrangement of pressure nozzles 511, ..., 514; 521, ..., 525 in a second printing device 500, as used as the second printing device 60, 70; 110, 210 may be used in any of the previously described embodiments.
  • the second Printing device 500 is, for example, an ink jet printing device, and in the example of FIG FIG. 5 two printheads 510, 520 with nozzles 511, ..., 514; 521, ..., 525 on.
  • the geometry represented represents a projection of the position of the print heads 510, 520 with respect to the web direction of the substrate 2 in the plane and is therefore also for the embodiments of FIG. 2 to FIG. 4 applicable.
  • the nozzles 511, ..., 514; 521,..., 525 of the print heads 510, 520 are arranged in two lines which are perpendicular to the web direction of the substrate 2.
  • the nozzles of the two lines are cascaded, so arranged so that their line position is not coincident or offset from one another. This makes it possible to hold the nozzles stationary with respect to the position of the substrate 2 and still achieve coverage of the entire web width with nozzles.
  • the distance d between two nozzles 521, 522 and 512, 513 is 80 ⁇ m, for example, in the case of an output resolution of the printheads 520, 510 of 300 dpi, and at an output resolution of 600 dpi, d is 40 ⁇ m.
  • the extent of the print heads 510, 520 or of their nozzles 511, ..., 514; 521, ..., 525 covered printing area is preferably at least the full web width of the substrate 2, so that edge regions of the substrate 2 can be printed with the second printing device 500.
  • FIG. 6 shows, as in the embodiment according to FIG. 4 the printing on the substrate 2 is effected by means of inkjet printheads 104, 105, the inkjet printheads 104, 105 being representative of the entirety of printheads 104,..., 108 and 204,..., 208 of the embodiment of FIG. 4 are.
  • the counter-pressure cylinder 103 is shown, which, however, can also be regarded as a representative of the impression cylinder 203 (when the direction of rotation indicated by the arrow is reversed).
  • the substrate 2 to be printed is guided on the surface of the impression cylinder 103.
  • An inkjet printhead 104 irradiates at a frequency f the substrate 2 with ink drops.
  • Typical frequencies for ink jet are at an interval of 20 kHz ⁇ f ⁇ 200 kHz. Preferably, the frequencies are in an interval of 50 kHz ⁇ f ⁇ 100 kHz.
  • the drops 110 adhere and form ink patches 111 with a diameter d.
  • Typical diameters of the color spots are in a range of 20 ⁇ m ⁇ d ⁇ 100 ⁇ m or 1270 dpi ⁇ d ⁇ 256 dpi.
  • the web transport speed of the substrate 2 is greater than d / f. Typical web speeds are in a range of 4 m / s ⁇ v ⁇ 15 m / s.
  • a second inkjet print head 105 then also irradiates the substrate 2 at a frequency f with ink droplets 112. The droplets 112 that it produces then form color spots 113 that remain between the ink patches 111 that were produced by the first inkjet printhead 104 Close gaps. With suitable synchronization of the two print heads 104, 105 to each other and to the movement of the substrate 2, the double resolution can be achieved at the same web speed v.
  • FIG. 7 shows an arrangement of the printing devices 110, 210 and printing units 100, 200, in which the transfer cylinders 102, 202 serve as web guide elements or guide rollers for the substrate 2.
  • the printheads 104, 105, 106 of a first printing device 110 and printheads 204, 205, 206 of a second printing device 210 print directly on the substrate 2.
  • FIG. 7 the transfer cylinders 102, 202 and not as in FIG. 4 the impression cylinders 103, 203 are used as web guide elements. This results, inter alia, the advantage over the embodiment of FIG. 4 in that a shorter distance of the substrate between the pulleys 109, 209 is guided.

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Claims (16)

  1. Machine à imprimer (10, 11, 12, 13) pour imprimer une image d'impression en plusieurs couleurs formée à partir de plusieurs extraits de couleur, dans laquelle chacun des extraits de couleur représente une maquette d'impression qui se compose des informations concernant une image d'impression à imprimer dans une couleur de base (C, M, Y, K), la machine à imprimer (10, 11, 12, 13) incluant :
    a) au moins un premier dispositif d'impression (30, 40, 50, 80) ayant une forme d'impression pour un premier extrait de couleur d'une première couleur (C, M, Y, K),
    b) au moins un second dispositif d'impression supplémentaire (60, 70 ; 60', 70' ; 60", 70" ; 500) pour un second extrait de couleur d'une autre seconde couleur (C, M, Y, K),
    dans laquelle aucun des au moins un premier dispositif d'impression (30, 40, 50, 80) n'est agencé pour transférer un extrait de couleur de la seconde couleur (C, M, Y, K).
  2. Machine à imprimer (10, 11, 12, 13) selon la revendication précédente, dans laquelle le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) inclut un dispositif d'impression à jet d'encre ou un dispositif d'impression électrophotographique.
  3. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) inclut plusieurs têtes d'impression (61, 71, 510, 520).
  4. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) imprime directement sur un substrat à imprimer (2).
  5. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle au moins une tête d'impression (61, 71, 510, 520) d'un second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est agencée de manière à appliquer la seconde couleur (C, M, Y, K), en particulier une couleur chromatique (C, M, Y), sur un cylindre de transfert (81, 81').
  6. Machine à imprimer (10, 11, 12, 13) selon la revendication précédente, dans laquelle le cylindre de transfert (81, 81') pour la au moins une tête d'impression (61, 71, 510, 520) d'un second dispositif d'impression (60, 70 ; 60', 70") est simultanément utilisé comme cylindre de transfert d'un premier dispositif d'impression (30, 40, 50, 80).
  7. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle une tête d'impression (61, 71 ; 510, 520) du second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est agencée dans un sens de rotation d'un cylindre de transfert (81, 81') entre un emplacement de contact d'un cylindre de plaque (82, 82') avec le cylindre de transfert (81, 81') et un substrat à imprimer (2).
  8. Machine à imprimer (10, 11, 12, 13) selon la revendication précédente, dans laquelle le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est agencé de manière à transférer une couleur (C, M, Y, K) sur un cylindre de transfert (81, 81') commun à au moins deux des têtes d'impression (61, 71, 510, 520).
  9. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle le premier dispositif d'impression (30, 40, 50, 80) comporte une forme d'impression effaçable.
  10. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, dans laquelle le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est agencé de manière à transférer la seconde couleur (C, M, Y, K), en particulier une couleur chromatique (C, M, Y), sur une partie d'un substrat (2) guidée autour d'un cylindre de transfert (81, 81') ou d'un cylindre d'impression complémentaire (103, 203).
  11. Machine à imprimer (10, 11, 12, 13) selon l'une des revendications précédentes, laquelle machine comporte un élément de guidage du substrat à imprimer (2) dans la zone de l'application de couleur par une ou plusieurs têtes d'impression (61, 71, 510, 520) du second dispositif d'impression (60, 70 ; 60', 70").
  12. Machine à imprimer (10, 11, 12, 13) selon la revendication précédente, dans laquelle l'élément de guidage est un rouleau conducteur.
  13. Machine à imprimer (10, 11, 12, 13) selon la revendication 11, dans laquelle l'élément de guidage est un cylindre de transfert (102, 202) ou un cylindre d'impression complémentaire (103, 203) d'un premier dispositif d'impression (30, 40, 50, 80).
  14. Procédé pour imprimer une image d'impression en plusieurs couleurs formée à partir de plusieurs extraits de couleur, dans lequel chacun des extraits de couleur représente une maquette d'impression qui se compose des informations concernant une image d'impression à imprimer dans une couleur de base (C, M, Y, K), le procédé comportant les étapes consistant à :
    a) transférer au moins un premier extrait de couleur d'une première couleur (C, M, Y, K) au moyen d'une forme d'impression d'un premier dispositif d'impression (30, 40, 50, 80), et
    b) transférer au moins un second extrait de couleur d'une seconde couleur supplémentaire (C, M, Y, K) au moyen d'un second dispositif d'impression supplémentaire sans forme d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500),
    dans lequel aucun extrait de couleur de la seconde couleur (C, M, Y, K) n'est transféré au moyen d'un premier dispositif d'impression (30, 40, 50, 80).
  15. Procédé selon la revendication précédente, dans lequel la résolution de l'image d'impression à transférer avec le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est différente de la résolution de l'image d'impression à transférer au moyen du premier dispositif d'impression (30, 40, 50, 80), et est en particulier inférieure à celle-ci.
  16. Procédé selon l'une des deux revendications précédentes, dans lequel le second dispositif d'impression (60, 70 ; 60', 70' ; 60", 70" ; 500) est agencé de manière à imprimer une couleur jaune (Y).
EP20100163341 2010-05-19 2010-05-19 Elément d'impression combiné Not-in-force EP2388136B1 (fr)

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Application Number Priority Date Filing Date Title
EP20100163341 EP2388136B1 (fr) 2010-05-19 2010-05-19 Elément d'impression combiné

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EP2388136B1 true EP2388136B1 (fr) 2014-01-22

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Publication number Priority date Publication date Assignee Title
US4575575A (en) 1984-04-05 1986-03-11 Phillips Petroleum Company Catalysts and process for olefin conversion
JP2946201B2 (ja) * 1997-04-17 1999-09-06 株式会社東京機械製作所 付加印刷装置付き輪転機及び付加印刷装置付き印刷ユニット
DE102004002132A1 (de) * 2004-01-15 2005-08-11 Man Roland Druckmaschinen Ag Einrichtung zur Erzeugung einer Beschichtung von Druckprodukten einer Druckmaschine
US8869698B2 (en) * 2007-02-21 2014-10-28 R.R. Donnelley & Sons Company Method and apparatus for transferring a principal substance
DE102006016065A1 (de) 2006-04-04 2007-10-11 Man Roland Druckmaschinen Ag Zusatzeinrichtung für eine nach dem Offset-Druckprinzip arbeitenden Druckmaschine
DE102008012385A1 (de) 2008-03-04 2009-09-10 Wifag Maschinenfabrik Ag Offsetdruck mit reduziertem Farbauftrag

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