EP0308367A1 - Machine d'impression flexographique, en particulier pour l'impression préliminaire - Google Patents

Machine d'impression flexographique, en particulier pour l'impression préliminaire Download PDF

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Publication number
EP0308367A1
EP0308367A1 EP88810555A EP88810555A EP0308367A1 EP 0308367 A1 EP0308367 A1 EP 0308367A1 EP 88810555 A EP88810555 A EP 88810555A EP 88810555 A EP88810555 A EP 88810555A EP 0308367 A1 EP0308367 A1 EP 0308367A1
Authority
EP
European Patent Office
Prior art keywords
printing
roller
support cylinder
cylinder
flexographic 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.)
Withdrawn
Application number
EP88810555A
Other languages
German (de)
English (en)
Inventor
Peter Lauber
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.)
Conprinta Ltd
Original Assignee
Conprinta Ltd
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
Application filed by Conprinta Ltd filed Critical Conprinta Ltd
Publication of EP0308367A1 publication Critical patent/EP0308367A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/007—Use of printing belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing

Definitions

  • the invention relates to a flexographic printing machine, in particular for flexographic printing, which has at least one printing unit, each with an endless printing ribbon, which is wound around a support cylinder and a tensioning roller, a counter-pressure cylinder, an anilox roller, which transfers the ink to the printing ribbon, an ink dryer, and one which runs through all printing units , about the deflecting roller / s and the pulling roller / s between the printing belt and the impression cylinder and the paper web guided through the ink dryer.
  • the support cylinder and the tensioning roller are movably arranged.
  • the invention further relates to a method for lifting a printing tape in the flexographic printing machine.
  • FIG. 1 A dimensionally stable endless belt 11 is mounted on a support cylinder 12 and a tension roller 14. Flexible pressure plates 16 are fastened on the outside of this endless belt, whereby a pressure belt 10 is formed.
  • the printing ink is transferred from an anilox roller 18, which is immersed in an ink bath (not shown), to the printing plates 16. Redundant color is from a doctor blade 20 formed in the form of an inverted angle.
  • the paper web 22 guided in the direction of the arrow is pressed onto the printing plates by an impression cylinder 24 and printed on one side.
  • the endless belt 11 serving as a carrier consists of, for example, 0.25 mm thick polyester film, in particular of polyethylene terephthalate.
  • the physical properties of the transverse and longitudinally stretched film material are the same in all directions. The uniformity extends over a wide temperature and humidity range.
  • the film-like tape material has good elongation and impact resistance in the transverse and longitudinal directions.
  • the flexible film material of the endless belt is chemically resistant and resists oils, greases, printing inks, etc.
  • the long sides of the endless belt 11 are provided with a perforation 26, which is penetrated by knobs of the spiked discs transporting the belt in a known manner. This prevents the printing tape from sliding on the rollers.
  • the flexible printing plates 16 usually consist of a photopolymer material or rubber and are glued to the endless belt 11 with a suitable adhesive.
  • the printing plates 16 in the present example have a structured surface 28, which generates the printed image.
  • the printing tapes 10 described above have the advantage that the flexible printing plates 16 do not have to be mounted on the printing cylinder, but that they can be glued to the endless tape, which can be easily removed from the flexographic printing machine after use. All printing tapes used can be rolled onto a sleeve and stored in a space-saving manner.
  • Flexographic prints up to 2.5 m wide are currently being produced with printing tapes up to 4.5 m long.
  • the flexographic printing machines are run at high speed and are equipped with control devices for the automatic monitoring and registration of the paper webs.
  • Flexographic printing presses according to the Conprinta system are usually equipped with 3 - 10 printing units. Any printing unit that is not involved in the ongoing printing process can already be equipped for the next step. This usually takes 5-15 minutes. The printing tape that is no longer used is removed, the new printing tape is installed and the printing ink is replaced.
  • individual printing units can also contain a conventional, structured or unprinted printing cylinder instead of the printing belt. This is done primarily for smooth or textured paintwork or for applying a base color.
  • Flexographic printing machines of the type mentioned initially work with support cylinders and tensioning rollers which have bearings rigidly attached to the machine frame. After the paper web has been correctly positioned - the color samples printed on top of each other must fit exactly - the impression cylinder is pressed onto the endless printing belt, which is pulled over the support cylinder, with the paper web lying between the printing belt and the impression cylinder. The anilox roller, which applies the ink, is also placed on the printing belt in the area of the support cylinder.
  • a printing tape has to be taken out of service for a short time, for example if there is color on one or several printing plates.
  • the corresponding impression cylinder is raised, which also lifts the paper web from the printing belt.
  • the printing belt running at the same speed as the paper web can now be stopped and the corresponding printing plate (s) can be cleaned.
  • the impression cylinder with the paper web is pressed against the printing tape again.
  • the paper that is poorly printed during this operation is detected by an automatic monitoring system and is later excreted.
  • a printing press with four printing units is known, which are arranged around a common impression cylinder.
  • a material web to be printed is guided around the impression cylinder.
  • Each of the printing units is used to apply a special ink and comprises a flexible printing belt driven by frictional force, which can be individually applied to and removed from the common impression cylinder.
  • the support roller pressing the printing belt onto the impression cylinder or the material web guided thereon is on a first step ger arranged, the ink on the printing tape anilox roller on a second carrier. If the printing is interrupted, for example, in order to lift the support roller by means of the first carrier, the anilox roller must first be raised by means of the second carrier. There must always be two separate movements, including the anilox roller, which is complex and complicated.
  • the inventor has set himself the task of creating a flexographic printing machine of the type mentioned at the outset, in which a printing tape can be taken out of operation without the anilox roller being displaced or the tension of the paper web being impaired, although the acquisition and operating costs of the flexographic printing machine are not or should not be significantly higher than before. Furthermore, a method for lifting a printing tape in a flexographic printing machine of the above type is to be developed.
  • the object is achieved according to the invention in that the bearings of the impression cylinder are rigidly attached to the machine frame in each printing unit, the bearings of the support cylinder, on the other hand, are displaceably arranged in at least two directions and those of the tension roller in at least one direction.
  • the tension of the paper web is not affected when the print ribbon is lifted by moving the support cylinder. In contrast, as mentioned above, the paper web is not printed during this time in the printing unit in question.
  • the support cylinders are preferably displaceable both in the vertical and in the horizontal and axial directions.
  • Horizontal means in the direction of the paper web passing between the printing belt and impression cylinder, vertically perpendicular to it.
  • the vertical and horizontal displacement of the support cylinder and thus the printing belt serves for lifting off, for example for cleaning the printing plates.
  • the printed images can be corrected if the differently colored prints do not match enough.
  • the tensioning roller it is sufficient for the tensioning roller if it can be moved in the vertical direction.
  • vertical movements of the support cylinder can be compensated for, the printing tape remains or is tensioned again.
  • a slight horizontal displacement of the support cylinder has hardly any influence on the optimal position of the tension roller.
  • the bearings of the anilox roller of a printing unit can be rigidly installed in the machine frame.
  • Flexographic printing machines expediently have printing units with an anilox roller which can be uncoupled from their drive shaft and can be exchanged automatically during the set-up time of the printing unit concerned.
  • the details of this system are described in European Patent Application No. 88106599.9. As indicated, it is not necessary to change or move the anilox roller to lift the print ribbon.
  • the method according to the invention for lifting off a printing band in a flexographic printing press of the above type is characterized in that the support cylinder guiding the printing tape is first lifted off from the anilox roller and then from the impression cylinder guiding the paper web, the period of time that a dot on the printing tape needs to move forward from the anilox roller to the impression cylinder Corresponds to the time period that elapses from the lifting of the printing tape from the anilox roller until it is lifted off the impression cylinder.
  • the support roller is moved away in such a way that the ink picked up by the anilox roller is still released to the continuous paper web.
  • the ink picked up by the anilox roller is still released to the continuous paper web.
  • the flexographic printing machine is started up in such a way that the ink is picked up first, the printing plates occupied by the ink continue to the paper web, and only then is the printing tape pressed onto the paper web.
  • the printing unit of a flexographic printing machine shown in FIGS. 3 and 4 includes a machine frame 30 with the rollers and cylinders guiding or printing the paper web 22, their suspensions and drive elements, reference being made to FIGS. 1 and 2.
  • the state of the art corresponding components are not all described and described in detail.
  • the paper web 22 is guided via a deflection roller 32 rigidly mounted in the machine frame to the rubberized pull roller 34, which can be lifted off the impression cylinder 24 by means of a pressure cylinder 50, whereby the paper web is no longer clamped between the pull roller 34 and the impression cylinder 24.
  • the paper web 22 further wraps around the impression cylinder 24, which has bearings 41 rigidly attached to the machine frame 30, and is printed with the ink transferred from the working anilox roller 18a to the printing belt 10 as it passes between the support cylinder 12 and impression cylinder 24.
  • the working anilox roller 18a is mounted in two swivel arms 38 which can be rotated by at least 180 ° and which are fixed in a position stop (not shown).
  • an anilox roller 18b which is in reserve is mounted.
  • the lowering of the swivel arms 38 with the anilox rollers 18a, 18b to a stop takes place with lifting cylinders 44 fastened on both sides to the machine frame 30, with a lowerable protective housing 46 arranged directly above them, which in turn each guide a non-visible piston rod supporting the swivel arm 38.
  • the upper part of the swivel arm 38 travels on a rail guide 39 from the positioning stops mentioned and can now be rotated through 180 ° by means of a unit which exerts a torque.
  • the anilox roller previously in reserve becomes the new working anilox roller 18a.
  • the anilox roller that is in reserve after turning, the previous work roller, can be quickly cleaned or replaced by another anilox roller.
  • the tensioning roller 14 is outside the range of rotation of the anilox rollers 18a, 18b.
  • the tensioning roller 14 When replacing the anilox rollers, only the printing tape 10 has to be removed. If, on the other hand, a short printing tape 10 '(Fig. 1) is used, not only the printing tape 10' must be removed before the anilox rollers are rotated, but the tensioning roller 14 'must be lowered into the position 14 ⁇ so that there is sufficient free space.
  • the axis of the support cylinder 12 and the axis of the tension roller 14 have the distance a.
  • this distance must remain constant so that the printing tape 10 has the correct tension during printing. This is achieved by means of a tension rod 58 and applies regardless of the size of the distance a.
  • the support cylinder 12 and / or the tensioning roller 14 can be lowered for cleaning, removal or replacement of the printing belt 10 by means of the lifting cylinder 48 by the distance e, which is, for example, approximately 50 mm.
  • the printing tape is about 2 mm away from the anilox roller 18a and the impression cylinder 24.
  • the hydraulic unit 49 is indicated in Fig. 3.
  • the drive units 52 for the tensioning roller 14, 54 for the support cylinder 12 and 56 for the counter-pressure cylinder 24 are of a conventional design, familiar to the person skilled in the art, as are the spindles or shafts, which can be extended telescopically Transfer of the torques to the corresponding rollers. 4, the unit 54 does not exert its own driving force, but obtains it via transmission means.
  • the unit 54 drives the support cylinder 12 via a cardan shaft 96, which can absorb movements in all directions.
  • the cardan shaft 96 also enables the axial displacement of the support cylinder 12.
  • the unit 56 for the impression cylinder 24 is driven via a toothed belt 55, which unit also drives the pull roller 34, which is indicated by dash-dotted lines in FIG. 4.
  • the printing belt 10 and the paper web 22 are driven separately, but they must always run at exactly the same speed.
  • the tension on the printing belt 10 is changed by rotating the tensioning roller 14 somewhat faster or slower. In this way, an additional or less torque is exerted on the printing belt.
  • the tensioning roller 14 is suspended via a spindle lifting system 69. As shown in FIG. 4, the height of the tensioning roller 14 is changed by rotating the threaded spindle 61, which passes through the tensioning roller bearing 66.
  • the flexographic printing process is particularly suitable for large-area multi-color printing.
  • the flexographic printing process is extremely economical.
  • a paper web used as a cover sheet for packaging cardboard is printed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
EP88810555A 1987-09-10 1988-08-16 Machine d'impression flexographique, en particulier pour l'impression préliminaire Withdrawn EP0308367A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3502/87 1987-09-10
CH350287 1987-09-10

Publications (1)

Publication Number Publication Date
EP0308367A1 true EP0308367A1 (fr) 1989-03-22

Family

ID=4257375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810555A Withdrawn EP0308367A1 (fr) 1987-09-10 1988-08-16 Machine d'impression flexographique, en particulier pour l'impression préliminaire

Country Status (3)

Country Link
US (1) US4856429A (fr)
EP (1) EP0308367A1 (fr)
CA (1) CA1303900C (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100871A1 (de) * 1991-01-14 1992-07-16 Conprinta Ltd Flexodruckmaschine
EP0623464A1 (fr) * 1993-05-07 1994-11-09 ARNOLDO MONDADORI EDITORE S.p.A. Machine d'impression flexographique à bobines à haute vitesse
DE4410132A1 (de) * 1994-03-24 1995-09-28 Thimm Verpackung Gmbh & Co Flexodruckmaschine, insbesondere für Mehrfarbendruck
EP1038670A1 (fr) 1999-03-26 2000-09-27 Rollin S.A. Procédé de réalisation d'une bande d'impression en relief à base de photopolymères
DE102014101432B3 (de) * 2014-02-05 2014-12-24 CONPRINTA GmbH & Co. KG Druckwerk für eine Flexodruckmaschine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2166341A1 (fr) * 1994-12-30 1996-07-01 Thomas J. Kacmarcik Methode et appareil pour imprimer des livrets de bingo
NL1009274C2 (nl) * 1998-05-28 1999-12-03 Av Flexologic Bv Flexibele drager voor drukplaat.
US6109179A (en) * 1999-06-03 2000-08-29 Monarch Marking Systems, Inc. Composite printing band and method of making same
US20100092743A1 (en) * 2008-10-10 2010-04-15 Alrick Vincent Warner Absorbent fibrous web substrates having distinct graphics and method for printing substrates

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417391A1 (fr) * 1978-02-21 1979-09-14 Midland Ross Corp Presse d'imprimerie du type a courroie
GB2102733A (en) * 1981-05-30 1983-02-09 Cobden Chadwick Ltd Printing presses

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538516A (en) * 1979-04-16 1985-09-03 Somerset Technologies, Inc. Torque-assist system for printing belts
DE3025546A1 (de) * 1980-07-05 1982-01-28 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum aufbringen eines fluessigen bzw. halbfluessigen mediums auf die druckplatte einer druckmaschine, insbesondere offsetdruckmaschine
GB2160820A (en) * 1984-05-08 1986-01-02 Isowa Industry Co Method of controlling speed of printing belt and device therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417391A1 (fr) * 1978-02-21 1979-09-14 Midland Ross Corp Presse d'imprimerie du type a courroie
GB2102733A (en) * 1981-05-30 1983-02-09 Cobden Chadwick Ltd Printing presses

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
log *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 5 (M-184) 1150 11 Januar 1983, & JP-A-57 165262 (NIHON KEESU) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100871A1 (de) * 1991-01-14 1992-07-16 Conprinta Ltd Flexodruckmaschine
EP0623464A1 (fr) * 1993-05-07 1994-11-09 ARNOLDO MONDADORI EDITORE S.p.A. Machine d'impression flexographique à bobines à haute vitesse
US5413041A (en) * 1993-05-07 1995-05-09 Arnoldo Mondadori Editore S.P.A. High-speed web-fed flexographic printer
DE4410132A1 (de) * 1994-03-24 1995-09-28 Thimm Verpackung Gmbh & Co Flexodruckmaschine, insbesondere für Mehrfarbendruck
EP0676284A1 (fr) * 1994-03-24 1995-10-11 Thimm Verpackung GmbH + Co. Machine d'impression flexographique en particulier pour l'impression en plusieurs couleurs
US5479855A (en) * 1994-03-24 1996-01-02 Thimm Verpackung Gmbh & Co. Belt-type printing machine for multi-color purposes
EP1038670A1 (fr) 1999-03-26 2000-09-27 Rollin S.A. Procédé de réalisation d'une bande d'impression en relief à base de photopolymères
FR2791441A1 (fr) * 1999-03-26 2000-09-29 Rollin Sa Procede de realisation d'une bande d'impression en relief a base de photopolymeres
DE102014101432B3 (de) * 2014-02-05 2014-12-24 CONPRINTA GmbH & Co. KG Druckwerk für eine Flexodruckmaschine
WO2015117807A1 (fr) 2014-02-05 2015-08-13 CONPRINTA GmbH & Co. KG Groupe d'impression pour machine de flexographie

Also Published As

Publication number Publication date
US4856429A (en) 1989-08-15
CA1303900C (fr) 1992-06-23

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