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WO1994016892A1 - Procede et dispositif d'impression - Google Patents

Procede et dispositif d'impression Download PDF

Info

Publication number
WO1994016892A1
WO1994016892A1 PCT/EP1994/000236 EP9400236W WO9416892A1 WO 1994016892 A1 WO1994016892 A1 WO 1994016892A1 EP 9400236 W EP9400236 W EP 9400236W WO 9416892 A1 WO9416892 A1 WO 9416892A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing
printing unit
web
pattern
reference pattern
Prior art date
Application number
PCT/EP1994/000236
Other languages
German (de)
English (en)
Inventor
Erhard Lorch
Original Assignee
Dlw Aktiengesellschaft
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 DE4317984A external-priority patent/DE4317984A1/de
Application filed by Dlw Aktiengesellschaft filed Critical Dlw Aktiengesellschaft
Priority to EP94905724A priority Critical patent/EP0681525B1/fr
Priority to DE59401210T priority patent/DE59401210D1/de
Publication of WO1994016892A1 publication Critical patent/WO1994016892A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme

Definitions

  • the present invention relates to a method and an apparatus for printing webs or sheets with patterns, in particular with repeating patterns.
  • a preferred method is the printing of PVC floor covering webs.
  • the so-called gravure process is generally used for patterns that are referred to as repeats in printing technology.
  • a printing form provided on a cylinder is lowered on the printing elements by etching or engraving.
  • the web to be printed is guided past the rotating printing form by means of a pressure roller.
  • the circumference of the cylinder corresponds to the length of one repeat of the decor.
  • a repeat of a decor should not necessarily mean the smallest period of repetition. Rather, a repeat can also have several such periods, especially if that
  • PVC sheets worked in the so-called special colors room.
  • the individual color separations to be printed were assigned empirically determined colors that were recognizable with the eyes.
  • the brilliance and sharpness of the printed image are lost.
  • the implementation from design to design requires an interpretation that is carried out empirically from design to design. This in turn means that the printed image never corresponds exactly to the original.
  • PVC tiles as flooring are nowadays mostly manufactured by manufacturing PVC sheets according to the above-mentioned method and then punching out the tiles. So the tiles are not made individually in sheet printing. Overall, the previous method of depressing PVC webs is perceived as unsatisfactory, since there is a high level of engraving risk for fashionable markets, high development costs and long development times of an average of six months are required, and rapid reactions to changing market conditions are not possible .
  • the invention is particularly preferably suitable for printing webs with repeating patterns (repeats). Also for printing on sheets, ie general cargo and in particular PVC flooring tiles with patterns, which will be explained in more detail below. In general, however, the printing of PVC tiles has the same advantages as for floor covering webs.
  • the method according to the invention and the device according to the invention are generally suitable for all printing methods, but in particular for offset printing and letterpress printing. Both processes have so far not been considered for the printing of repeating patterns (repeats) or felt to be unsatisfactory. Since the marginal conditions in high pressure and offset printing are similar, in the following only reference is made to offset printing. However, these references should apply to high pressure.
  • the offset printing process is known per se.
  • offset printing a plate-like printing form is applied around a plate cylinder. From a purely mechanical point of view, it is not possible for the two ends of the printing form to touch each other seamlessly. In this respect, seams have so far always been seen when printing rapport by means of offset printing.
  • the method according to the invention or the device according to the invention to the gravure printing process it should be noted that it would generally also be possible to clamp printing forms prepared for the gravure printing process onto a cylinder. However, the printing surfaces in the gravure printing process must be wiped off with a doctor blade. In this respect, the opening of gravure forms
  • the offset printing method can be used advantageously when printing webs with repeating patterns, the so-called continuous printing.
  • the two printing units can be matched exactly, that is to say in the range from at least 1/100 mm to in the range 1/1000 mm, continuous printing according to the invention can be achieved using the offset method without visible seams.
  • the first printing unit prints a part, preferably half, of the repeat or pattern, that is to say that
  • the repeat does not necessarily have to form the smallest period of the pattern.
  • the second printing unit, through which the web to be printed runs, is so matched to the rotational position of the first printing unit and to the distance from it that the remaining part, that is to say preferably the second half of the repeat or the pattern, is matched to that Web prints.
  • the two printing units virtually form a unit like a single conventional offset printing unit. If one therefore designs in multicolor printing, a set of two offset printing units must be provided for each color.
  • the division of the repeat is preferably chosen differently for each individual color. This achieves a higher level of uniformity, since the slightest misalignments that may occur do not appear to be effective, since they only affect part of the
  • the repeat or pattern is divided within surface areas of constant density. This method is somewhat more complex than the simple division of the repeat or pattern by half mentioned above. Because the print template is to be examined for the density and the dividing line is to be laid depending on the density. The dividing line often does not run perpendicular to the longitudinal direction of the web but follows the surface areas of constant density according to the motif of
  • Print template This procedure can result in several equally favorable division options for a motif. In this case, it is particularly preferable to divide it approximately in the area of the center of the repeat or pattern, for reasons of uniform stress.
  • the preferred embodiment of dividing the repeat or pattern within the lowest density areas is particularly advantageous if the so-called frequency-modulated halftone reproduction is used instead of the amplitude-modulated halftone reproduction.
  • Silver grains are stochastically distributed in the film or photo paper. These silver grains are either exposed or not, so they are either black or white.
  • the value of the semitone results from the density of exposed or unexposed grains.
  • the tonal value does not result from a single grain, but from the density of exposed or unexposed grains per image zone.
  • This principle of halftone reproduction in black and white photography can also be transferred to printing, in particular offset printing, by using suitable data processing technology using, for example, pseudostochastic methods.
  • This embodiment in conjunction with frequency-modulated halftone reproduction thus represents a particularly preferred embodiment of the invention.
  • a drying device is provided between the first and the second printing unit, by means of which the pressure applied by the first printing unit is dried before entering the second printing unit.
  • the drying device is preferably of the radiation type.
  • a UV drying device is particularly advantageous.
  • Another particularly preferred embodiment consists in that the printing is generally carried out in the so-called wet-on-wet process with radiation-drying inks, only one radiation-drying device being provided at the end of the printing section, that is to say downstream of the last printing unit.
  • the method according to the invention is preferably carried out with a device in which the printing units have a direct imaging unit instead of the dampening units, which e.g. by means of the contactless
  • Electroerosion or, using laser techniques can directly image printing forms provided for this purpose.
  • the imaging unit is able to receive and process digital print data directly.
  • the printing units are preferably compared with one another with the aid of a reference pattern, which is printed or otherwise provided, for example, on the web or sheet by a reference pattern identification device.
  • the reference pattern is advantageously located at the edge of the web or sheet in an area that is generally cut off after printing.
  • the reference pattern is preferably printed on with an upstream reference printing unit in a printing process which allows the reference pattern to be printed continuously.
  • the reference pattern can be printed using the gravure printing process, the reference pattern being engraved endlessly on a gravure cylinder.
  • all other printing methods are also suitable as far as they allow an uninterrupted continuous printing of the reference pattern.
  • the reference pattern does not necessarily have to be provided by printing. It is also conceivable to punch or emboss or also cut the pattern, for example by means of a laser cutting device or a water jet cutting device.
  • the adjustment takes place in all printing units that follow the device with which the reference pattern was applied.
  • the reference pattern is preferably such that the following printing units can be adjusted not only in the longitudinal direction, that is to say the web direction, but also in the transverse direction of the web or sheet.
  • the subsequent printing units are then adjusted taking into account the read reference pattern at least in the longitudinal direction of the web or sheet, but preferably also in the transverse direction of the web or sheet.
  • a precise adjustment or adjustment of the printing units to one another is essential in the method according to the invention at least when large webs are printed with large masses, such as PVC floor covering webs. Due to the mechanical boundary conditions there is the susceptibility to incorrect adjustments with the
  • Time is particularly long, which, if readjustments are omitted, lead to blurring and color shifts in the print.
  • the accuracy of the adjustment depends, among other things, on the web speed during printing, on the spacing of the elements of the reference pattern and on the scanning frequency of the reading device in the following printing units.
  • the speed when printing PVC floor covering webs is about 50 m per minute, which is very slow compared to the printing of paper like newspapers.
  • the spacing of the elements of the reference pattern is very small, e.g. in the micrometer range.
  • the device is particularly suitable for printing on PVC floor covering webs, but it is also possible to apply the invention to printing on gift paper, toilet paper and the like.
  • the method according to the invention it is of course also possible to use the method according to the invention to be used in the printing of carpets or textiles, in which cases, however, the requirements for the transitions between the rapports will generally not necessarily require the application of the invention.
  • a direct imaging machine currently on the market allows the processing of sheets or repeat parts up to max. 504 mm x 340 mm.
  • a commonly used PVC flooring tile size is 500mm x 500mm.
  • the invention is particularly preferably also suitable for printing tiles of this standard size, each of the two printing units printing a part of the tile pattern, a maximum tile size of 504 mm ⁇ 680 mm being conceivable.
  • the media to be printed are preferably floor coverings, the following is noted regarding the question of resistance to treading.
  • floor coverings preferably floor coverings
  • calender coverings The coating layers are generally printed directly and then a protective layer is also applied in the coating process.
  • a running layer is usually laminated onto the calender coverings, the lower layer of which can generally also consist of regenerated material.
  • the lower layer can therefore be printed, a transparent film being subsequently laminated on.
  • FIG. 1 is a side view of a gravure cylinder according to the prior art, around the entire circumference of which a printing form is provided or which is circumferentially provided with a repeat;
  • FIG. 2 is a schematic side view of a device according to the invention for printing webs with repeating patterns by two offset printing units;
  • Figure 3 is a top view of two offset printing forms and a web section printed therewith;
  • FIG. 4 is a top view of a web section and shows the rapport division within surface areas of the lowest density.
  • an intaglio cylinder 10 (FIG. 1) is engraved endlessly around its entire circumference, so that the period of the repeating pattern (repeat) is ⁇ D, where D is the
  • a device according to the invention is shown schematically in FIG. Of the two offset printing units (high-pressure units are also suitable), only the plate cylinders 2a, 2b are shown in the side view.
  • the inking unit assigned to the plate cylinders 2a, 2b, the printing cylinder around which the web to be printed is guided, and possibly a rubber cylinder provided between the plate and printing cylinders for the use of indirect printing are not shown.
  • the plate cylinders 2a, 2b carry a printing form 4a and 4b, respectively.
  • the printing forms 4a, 4b each span half of the respective plate cylinder 2a, 2b in this embodiment.
  • FIG. 2 also schematically shows a web 8 to be printed with the device according to the invention and a UV drying device 6, which is provided between the two offset printing units and that of the first plate cylinder 2a with the first printing form 4a applied pressure dries before entering the second printing unit with the second plate cylinder 2b, which carries the second printing form 4b.
  • a reference pattern 5 (see FIG. 3) is continuously and uninterruptedly applied to the web by a reference pattern identification device (not shown) printed.
  • the printing units with the plate cylinders 2a, 2b each have a matching or adjusting device 7 which reads the reference pattern 5 and on-line in this way to the rotational position and Transverse position of the respective plate cylinder 2a, 2b acts that a high registration accuracy is achieved.
  • FIG. 3 the two printing forms 4a and 4b provided on the plate cylinders 2a, 2b, each with a half repeat R, and a web 8 printed with them are shown in detail.
  • FIG. 3 also shows that the web 8 is provided with the reference pattern 5 at the edge.
  • the reference pattern 5 is shown exaggerated in the drawing. In practice, very finely printed or e.g. read cut or punched reference samples that are barely visible, still read properly.
  • both plate cylinders 2a, 2b are provided with an adjusting device 7, which in the position of the plate cylinders 2a, 2b
  • transverse and longitudinal directions are readjusted as a function of the reference pattern read. If further pairs of printing units, e.g. are provided for multi-color offset printing, all subsequent printing units should preferably have such an adjustment device 7. In this case, the distribution of the repeat can vary for the individual colors in order to avoid even the slightest misalignment.
  • FIG. 4 is a top view of another web section 8 'and shows the particularly preferred repeat division along or within surface areas of lowest density. 4 is another one
  • Form of reference pattern 5 ' shown, which allow not only an alignment in the longitudinal but also in the transverse direction of the web 8'.
  • the pattern shown in FIG. 4 which is not unlike a tire tread pattern, would result in a half division of the repeat both within surface areas lowest and highest density.
  • the repeat division is virtually invisible, in particular when the frequency-modulated halftone reproduction is selected.
  • the division line leads through image zones of the lowest density without any blackening, so that the division actually becomes invisible.
  • the evaluation of the print template with regard to the density required for the use of this type of repeat division can either be carried out using a suitable sensor system. Since the print templates are now often digitally available in a data processing system, density evaluation is also possible within the data processing system by using suitable algorithms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Confectionery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant d'imprimer des motifs sur des bandes (8) ou des feuilles, notamment des motifs répétitifs (des rapports). La bande (8) ou la feuille passent au moins par deux groupes d'impression (2a, 2b). Le premier groupe d'impression (2a) imprime une partie du motif sur la bande (8) ou la feuille et un second groupe d'impression (2b) dont la position de rotation est alignée sur celle du premier (2a), imprime le reste du rapport sur la bande (8) ou la feuille.
PCT/EP1994/000236 1993-01-29 1994-01-28 Procede et dispositif d'impression WO1994016892A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94905724A EP0681525B1 (fr) 1993-01-29 1994-01-28 Procede et dispositif d'impression
DE59401210T DE59401210D1 (de) 1993-01-29 1994-01-28 Druckverfahren und druckvorrichtung

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEP4302557.9 1993-01-29
DE4302557 1993-01-29
DEP4317984.3 1993-05-28
DE4317984A DE4317984A1 (de) 1993-01-29 1993-05-28 Druckverfahren und Druckvorrichtung

Publications (1)

Publication Number Publication Date
WO1994016892A1 true WO1994016892A1 (fr) 1994-08-04

Family

ID=25922635

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/000236 WO1994016892A1 (fr) 1993-01-29 1994-01-28 Procede et dispositif d'impression

Country Status (6)

Country Link
EP (1) EP0681525B1 (fr)
CN (1) CN1117279A (fr)
AT (1) ATE145860T1 (fr)
DK (1) DK0681525T3 (fr)
HK (1) HK68397A (fr)
WO (1) WO1994016892A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721859A1 (fr) * 1994-05-24 1996-01-05 Gmp Procede offset d'impression en continu d'un support d'impression et supports ainsi imprimes
US5711225A (en) * 1994-01-31 1998-01-27 Nilpeter A/S Method for processing a continuous web extending along a predetermined path

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013107996A1 (de) * 2013-07-26 2015-02-19 Manroland Web Systems Gmbh Verfahren und Vorrichtung zum Herstellen von Druckformen sowie Druckverfahren
EP4008561B1 (fr) * 2020-12-03 2025-04-30 SWISS KRONO Tec AG Procédé et dispositif d'impression d'une surface d'un papier

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1387724A (en) * 1920-11-29 1921-08-16 Herbert C Jarvis Manufacture of wall-paper
DE407369C (de) * 1924-12-19 Stokes & Smith Co G M B H Gummidruckmaschine zum fortlaufenden Bedrucken von Papier- oder Stoffbahnen mit zwei Gegendruckzylindern
FR2342167A1 (fr) * 1976-02-27 1977-09-23 Tokyo Kikai Seisakusho Ltd Procede d'impression offset sans fin
GB2017003A (en) * 1978-03-13 1979-10-03 Toshin Kogyo Co Offset or lithographic printing process and apparatus for formation of continuous patterns

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE407369C (de) * 1924-12-19 Stokes & Smith Co G M B H Gummidruckmaschine zum fortlaufenden Bedrucken von Papier- oder Stoffbahnen mit zwei Gegendruckzylindern
US1387724A (en) * 1920-11-29 1921-08-16 Herbert C Jarvis Manufacture of wall-paper
FR2342167A1 (fr) * 1976-02-27 1977-09-23 Tokyo Kikai Seisakusho Ltd Procede d'impression offset sans fin
GB2017003A (en) * 1978-03-13 1979-10-03 Toshin Kogyo Co Offset or lithographic printing process and apparatus for formation of continuous patterns

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5711225A (en) * 1994-01-31 1998-01-27 Nilpeter A/S Method for processing a continuous web extending along a predetermined path
FR2721859A1 (fr) * 1994-05-24 1996-01-05 Gmp Procede offset d'impression en continu d'un support d'impression et supports ainsi imprimes

Also Published As

Publication number Publication date
CN1117279A (zh) 1996-02-21
EP0681525B1 (fr) 1996-12-04
DK0681525T3 (da) 1997-06-02
EP0681525A1 (fr) 1995-11-15
HK68397A (en) 1997-05-30
ATE145860T1 (de) 1996-12-15

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