EP0558010A1 - Procédé et dispositif pour imprimer des matériaux en bande - Google Patents

Procédé et dispositif pour imprimer des matériaux en bande Download PDF

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Publication number
EP0558010A1
EP0558010A1 EP93102985A EP93102985A EP0558010A1 EP 0558010 A1 EP0558010 A1 EP 0558010A1 EP 93102985 A EP93102985 A EP 93102985A EP 93102985 A EP93102985 A EP 93102985A EP 0558010 A1 EP0558010 A1 EP 0558010A1
Authority
EP
European Patent Office
Prior art keywords
ink
foam roller
thermoplastic
heating chamber
cliché
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Withdrawn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
EP93102985A
Other languages
German (de)
English (en)
Inventor
Frank Berrenbaum
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.)
BERRENBAUM GmbH
Original Assignee
BERRENBAUM GmbH
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 BERRENBAUM GmbH filed Critical BERRENBAUM GmbH
Publication of EP0558010A1 publication Critical patent/EP0558010A1/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Withdrawn legal-status Critical Current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
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/22—Means for cooling or heating forme or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers

Definitions

  • the invention relates to a method for printing material webs, in which heated thermoplastic ink is transferred from a foam roller soaked in this color onto the cliché of a heatable cliché cylinder and then printed from the cliché onto the material web.
  • the corresponding device consists of a housing with a heating chamber in which a plate cylinder and a foam roller associated therewith for the transfer of heated thermoplastic ink to a plate arranged on the plate cylinder are rotatably mounted, and an impression cylinder which is arranged such that a plate to be printed Material web between the impression cylinder and the plate cylinder can be passed.
  • Flexographic printing processes that work with flexible printing forms and liquid, solvent-based inks are preferably used for printing material webs.
  • the corresponding device mainly consists of an impression cylinder for guiding the material web, a plate cylinder and an associated inking roller.
  • the ink is usually fed to the inking roller by means of an immersion roller which is immersed in an ink pan.
  • the ink is transferred to the cliché on the cliché cylinder via the combination of the dipping roller and the inking roller.
  • a rotary printing method and a device for carrying out the method are known in which ink is fed to an immersion roller from an ink tray during the printing process.
  • the ink on the dipping roller is then optionally transferred to an intaglio cylinder with the interposition of an anilox roller and from there to the web of material to be printed.
  • thermoplastic ink which is in solid form at room temperature, since on the one hand only a little ink adheres to the surface of the immersion roller and on the other hand the ink on the surface of the immersion roller only in the areas of the gravure cylinder is passed on, which comes into contact with the grid plate arranged on the printing cylinder.
  • Signing devices are also known in which the required ink is supplied from a bottle placed on it, which is closed with a permeable membrane.
  • thermoplastic ink previously applied to the plate to the material web to be printed.
  • a printing device and an associated printing method have become known from EP 163 808 A2.
  • the transfer of the thermoplastic ink to the metal cliché takes place from a foam rubber roller impregnated with this ink, which is used as an ink reservoir, whereby the aforementioned disadvantages can be largely avoided.
  • an impression cylinder is provided, which presses the material web against the plate cylinder and thus enables printing on the material web.
  • a device for handling adhesives has become known from US Pat. No. 2,877,763, in which adhesive in the form of a rod is tangentially fed to a melting device and is metered out under pressure from a nozzle.
  • the melting device consists of a heated housing in which a chamber for receiving a rotatable melting and feeding roller is arranged. The surface of this roller is with transverse grooves provided that pull the supplied adhesive tangentially into the chamber and melt there.
  • thermoplastic ink to a printing device for printing on material webs.
  • the invention is therefore based on the object of providing a method and a device for printing on webs of material in which an uninterrupted printing process is made possible and optimal utilization of the available thermoplastic ink is achieved.
  • the foam roller is additionally supplied with thermoplastic ink by melting onto its surface during the printing process.
  • thermoplastic ink By melting onto the surface of the foam roller, the thermoplastic ink is evenly distributed on its surface and at the same time is distributed within the foam roller. This particularly simple process ensures constant pressure quality without any special effort.
  • thermoplastic ink is supplied by melting it from an ink bar placed on the foam roller, so that this enables particularly easy handling of the ink.
  • This color bar can also consist of a color powder.
  • thermoplastic ink is additionally sprayed onto the surface of the ink.
  • This method is particularly suitable for applications in which the ink consumption is so great that the foam roller is not able to melt enough color from the ink bar.
  • the solution is e.g. then advantageous when printing at high speeds, small repeats and large areas.
  • the paint is heated, preferably in a paint tank, to such an extent that it becomes liquid and then sprayed onto the foam roller. This can happen depending on the color consumption.
  • thermoplastic ink is supplied intermittently.
  • thermoplastic paint in the solid state at an opening in the heating chamber of the foam roller is feasible and the temperature in the heating chamber is selected so that the thermoplastic Color in contact with the foam roller can be melted onto it.
  • the foam roller Due to the temperature of the heating chamber, the foam roller is warmed up so that the thermoplastic paint, which is in the solid state, is melted onto the rotating foam roller in contact with it.
  • thermoplastic paint is in the form of a paint bar which extends through the opening into the heating chamber and can be placed on the foam roller. This execution is characterized by good handling of the thermoplastic paint in solid form.
  • the feed unit expediently has a conveying device for conveying the ink bar in the direction of the foam roller.
  • a metered melting of the ink bar on the foam roller can be achieved in a simple manner by the conveying device.
  • the feed unit can consist of a feed shaft which is connected to the foam roller via the opening in the heating chamber and is provided with the conveying device for conveying the ink bar.
  • the conveying device has a clamping device which engages the end of the paint bar opposite the foam roller, and a drive with which the clamping device with the paint bar can be displaced towards the foam roller depending on the ink consumption is.
  • the clamping device can e.g. be connected to a spring-loaded half nut which is moved on a clockwise rotating threaded spindle in the direction pointing towards the foam roller.
  • the spindle can be driven by an electromagnet using a rack, a gear and a freewheel.
  • a limit switch can be provided at the lower end of the conveyor, which is actuated in the lower end position of the color bar and supplies a signal for inserting the next color bar.
  • a device is characterized in that a spray device is provided is, with the thermoplastic paint in the liquid state from a paint tank through an opening in the heating chamber of the foam roller can be fed.
  • the device for printing material webs 2 with a thermoplastic ink from a rubberized impression cylinder 1 has a cliché cylinder 4 mounted on its lateral surface a cliché 3 is attached.
  • the distance between the impression cylinder 1 and the plate cylinder 4 is set so that the plate 3 rolls on the web of material 2 passed between the two cylinders and the ink on the plate 3 can be transferred to the web 2.
  • a foam roller 6 is mounted at intervals. The distance between the foam roller 6 and the plate cylinder 4 is slightly less than the thickness of the plate 3, so that it rolls once on the foam roller 6 each time the plate cylinder 4 rotates.
  • the color in the foam roller 6 is transferred to the plate 3 in accordance with the surface structure of the plate.
  • the cliché cylinders 4 and the foam roller 6 are accommodated in a heating chamber 5.
  • An opening 7 is provided in the heating chamber 5 above the foam roller 6, through which an ink bar 8 can be introduced into the heating chamber 5.
  • a vertically arranged feed shaft 9 is fastened above the opening 7, the cross section of which corresponds to the dimensions of the color bar 8 to be fed.
  • the opening 7 widens conically in the direction of the feed channel 9, which facilitates the insertion of the color bar 8. Faults caused by ink bars 8 which may jam or tilt in the opening 7 are thereby also avoided.
  • the opening 7 in the heating chamber 5 and the associated feed shaft 9 can also be arranged elsewhere in the heating chamber 5. So would be an oblique or horizontal one Arrangement conceivable. This does not affect the function described below.
  • a conveying device 10 is arranged within the feed shaft 9, with the aid of which the conveying of the ink bar 8 in the direction of the foam roller 6 can be controlled.
  • the ink bar 8 is preferably fed intermittently.
  • the ink supply is controlled by a preselection counter (not shown) depending on the number of prints. This allows the amount of paint supplied to be regulated and interrupted if necessary. This is e.g. then the case when the material web 2 must be exchanged for another material web 2. Since in this case the printing device has to be stopped, but the heating in the heating chamber 5 continues to operate, further paint would melt from the ink bar 8 if it remains on the foam roller 6. If the feed is stopped at this time, no paint can melt.
  • an empty indicator 11 is arranged in the lower region of the feed chute 9, which indicates when a new ink bar 8 is to be inserted.
  • This empty detector 11 can consist, for example, of an optoelectronic sensor.
  • the device described above ensures the continuous printing of material webs 2.
  • Through the constant and controllable ink supply through the feed chute 9 it is no longer necessary to replace the foam roller 6, or it is possible to use it much longer.
  • Replacing the foam roller 6 is only necessary when it is mechanically worn or when the color changes.
  • interruptions in operation due to technology are no longer detrimental to the quality of the printing result, since at the same time the ink is supplied by the ink bar 8 when the printing process is resumed.
  • the feed shaft of the device shown in FIG. 1 has been replaced by a conveyor device with a clamping device 12 for the ink bar 8.
  • a conveyor device with a clamping device 12 for the ink bar 8.
  • the ink bar 8 is held at its end opposite the foam roller 6 by the clamping device 12, into which it can be inserted.
  • the clamping device 12 By means of a drive 13, the clamping device 12 is moved towards the foam roller 6 as a function of the ink consumption, so that the ink bar 8 can melt on its end face in contact with the foam roller 6 and soak it.
  • a spring-loaded half-nut not shown in the drawing, which is moved downwards on a clockwise rotating threaded spindle 14.
  • the threaded spindle 14 is driven by an electromagnet, not shown in the drawing, with the aid of a toothed rack, a toothed wheel and a freewheel.
  • a limit switch is actuated, which supplies a signal for inserting the next color bar.
  • thermoplastic paint is applied to the foam roller in the liquid state by a spray device.
  • This exemplary embodiment is particularly suitable for prints at high speeds, small repeats and large areas in which it is no longer possible to melt off enough thermoplastic ink by contacting a color bar with the foam roller.
  • the paint is therefore heated so far that it changes to the liquid state, and then sprayed onto the foam roller 6 in order to soak it. This can also happen depending on the color consumption.
  • the spray device for the thermoplastic paint operates according to the circuit diagram shown in FIG. 4.
  • a three / two-way solenoid valve 15 With the aid of a pressure regulator 16 for the conveying air acting on the paint tank, the amount of paint emerging from the nozzle 17 can be regulated, which is intended to soak the foam roller 6. At the same time, the compressed air that is to atomize the paint is switched on via a controllable check valve 18. The pressure for this can be set on a pressure regulator 19 for the spray air. In addition, a post-spraying time can be set by means of a suitable device 20, which ensures that, after the ink supply has ended, any paint residues still emerging at the nozzle 17 are sprayed.
  • the spray air regulated by the pressure regulator 19 is then passed through a preheating chamber 21 to the spray device shown in FIG. 3. Via a line 22 it reaches an annular chamber 23 from which it closes a part emerges from an annular gap 24 and atomizes the paint conveyed through a nozzle 25 through the nozzle 17. The other part of the spray air emerges from two laterally arranged nozzles 26 and forms the paint cone into an oval cross section.
  • the height of the spraying device in relation to the foam roller 6 can be changed so that the width in which the foam roller 6 is sprayed can be varied.
EP93102985A 1992-02-25 1993-02-25 Procédé et dispositif pour imprimer des matériaux en bande Withdrawn EP0558010A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205682 1992-02-25
DE19924205682 DE4205682A1 (de) 1992-02-25 1992-02-25 Vorrichtung und verfahren zum bedrucken von materialbahnen

Publications (1)

Publication Number Publication Date
EP0558010A1 true EP0558010A1 (fr) 1993-09-01

Family

ID=6452492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102985A Withdrawn EP0558010A1 (fr) 1992-02-25 1993-02-25 Procédé et dispositif pour imprimer des matériaux en bande

Country Status (2)

Country Link
EP (1) EP0558010A1 (fr)
DE (1) DE4205682A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996014211A1 (fr) * 1994-11-02 1996-05-17 Druckfarbenfabrik Gebr. Schmidt Gmbh Procede d'impression
EP1022137B1 (fr) * 1998-12-22 2004-07-21 Heidelberger Druckmaschinen Aktiengesellschaft Dosification numérique d'encre
WO2008060875A1 (fr) * 2006-11-15 2008-05-22 3M Innovative Properties Company Transfert de matière par élimination de solvant pour impression flexographique
US9340053B2 (en) 2006-11-15 2016-05-17 3M Innovative Properties Company Flexographic printing with curing during transfer to substrate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525848A1 (de) * 1995-07-15 1997-01-16 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zur Farbversorgung einer Druckmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0163808A2 (fr) * 1984-04-30 1985-12-11 Markem Corporation Dispositif pour imprimer avec une encre chauffée
DE3705067C1 (en) * 1987-02-18 1987-12-17 Roland Man Druckmasch Device for improving the ink separation in an inking and damping unit
EP0314189A2 (fr) * 1987-10-29 1989-05-03 Canon Kabushiki Kaisha Procédé d'impression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2877763A (en) * 1956-07-31 1959-03-17 United Shoe Machinery Corp Cement handling apparatus
DE3101243C2 (de) * 1981-01-16 1983-10-13 Niedermayr Papierwarenfabrik Ag, 8200 Rosenheim Rotatives Flexo- bzw. indirektes Tiefdruckverfahren, sowie Vorrichtung zur Durchführung des Verfahrens
DE3905342A1 (de) * 1989-02-22 1990-08-23 Volker Ludwig Verfahren und vorrichtung zum auftragen von fluessigen, pastoesen oder plastischen substanzen auf ein substrat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0163808A2 (fr) * 1984-04-30 1985-12-11 Markem Corporation Dispositif pour imprimer avec une encre chauffée
DE3705067C1 (en) * 1987-02-18 1987-12-17 Roland Man Druckmasch Device for improving the ink separation in an inking and damping unit
EP0314189A2 (fr) * 1987-10-29 1989-05-03 Canon Kabushiki Kaisha Procédé d'impression

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996014211A1 (fr) * 1994-11-02 1996-05-17 Druckfarbenfabrik Gebr. Schmidt Gmbh Procede d'impression
EP1022137B1 (fr) * 1998-12-22 2004-07-21 Heidelberger Druckmaschinen Aktiengesellschaft Dosification numérique d'encre
WO2008060875A1 (fr) * 2006-11-15 2008-05-22 3M Innovative Properties Company Transfert de matière par élimination de solvant pour impression flexographique
US9340053B2 (en) 2006-11-15 2016-05-17 3M Innovative Properties Company Flexographic printing with curing during transfer to substrate
US9579877B2 (en) 2006-11-15 2017-02-28 3M Innovative Properties Company Flexographic printing with curing during transfer to substrate

Also Published As

Publication number Publication date
DE4205682A1 (de) 1993-08-26

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