EP1914071A2 - Presse rotative - Google Patents

Presse rotative Download PDF

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Publication number
EP1914071A2
EP1914071A2 EP07019595A EP07019595A EP1914071A2 EP 1914071 A2 EP1914071 A2 EP 1914071A2 EP 07019595 A EP07019595 A EP 07019595A EP 07019595 A EP07019595 A EP 07019595A EP 1914071 A2 EP1914071 A2 EP 1914071A2
Authority
EP
European Patent Office
Prior art keywords
printing
electrostatic
machine according
aids
rotary
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.)
Granted
Application number
EP07019595A
Other languages
German (de)
English (en)
Other versions
EP1914071A3 (fr
EP1914071B1 (fr
Inventor
Hubertus Dettke
Christa Dettke
Christoph Dettke
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PL07019595T priority Critical patent/PL1914071T3/pl
Publication of EP1914071A2 publication Critical patent/EP1914071A2/fr
Publication of EP1914071A3 publication Critical patent/EP1914071A3/fr
Application granted granted Critical
Publication of EP1914071B1 publication Critical patent/EP1914071B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing

Definitions

  • the invention relates to a rotary printing machine with electrostatic printing aids.
  • the printing cylinder also called “printing form cylinder”
  • the impression cylinder also called “impression roller”
  • web-fed printing presses the web-shaped substrate is pulled off a supply roll and, after printing, either wound onto a take-up roll or cut by a punch into web sections or blanks, and the web sections or blanks are stacked.
  • the wound, web-shaped substrate is if necessary later cut into sections or blanks.
  • the impression cylinder picks up ink from a paint pan in cells on its surface. The excess is scraped off. The ink is transferred to the substrate passing through the printing cylinder and impression cylinder.
  • Electrostatic printing aids improve the ink transfer from the printing cylinder to the substrate and thus increase the print quality.
  • an electric field is generated in the region of the printing gap between the printing cylinder and impression cylinder, which exerts a force on the ink in the cells of the printing cylinder, which intensifies the transition of the ink to the printing material and increases the print quality.
  • the printing cylinder is made of an electrically conductive material (e.g., a metal) to ground.
  • the impression cylinder or impression roller has on the circumference a (semi-) conductive layer to which a high voltage is transmitted, which generally has a negative polarity.
  • the layer on the circumference is mostly semi-conductive to minimize electrical currents and to avoid the generation of sparks that could cause explosion / ignition when working with solvent paints.
  • a semiconducting layer is understood as meaning a layer with a high electrical resistance, which greatly reduces the electrical current but still allows a certain electrical current to pass through.
  • the electrical resistance of the layer is measured, for example, with a measuring device having two parallel forks each holding a moistened leather strip about 8 cm long and about 1 cm wide, so that the two parallel leather strips are about 10 cm apart.
  • the two parallel leather strips are looped to a length of 8 cm around the outside of the layer.
  • a measuring voltage of 1,000 volts is applied.
  • resistances in the range from about 1 M ⁇ to 20 M ⁇ are measured for semiconducting layers which are particularly suitable for the present purpose. In the case of conductive layers, the resistances measured with this measuring arrangement are significantly lower and in the case of highly conductive layers they are much lower.
  • charging electrodes are used, which are directed onto the circumference of the impression roller and deliver the charge to the (semi-) conductive layer on the circumference of the impression roller, which sits on an insulating layer (so-called "top-loading").
  • the resistance of the insulating layer is preferably selected so that it allows a slow discharge of the impression roller after switching off the printing press.
  • Particularly suitable insulating layers have a resistance in the range of about one to two gigaohms as measured by a device of the type discussed above.
  • Other charging electrodes are directed to at least one end face of the impression roller and discharge the charge to a conductive layer below a (semi) conductive layer which is exposed at an end face of the impression roller (so-called “side charging”). Furthermore, arranged on the front side charging electrodes are known, which cooperate with a conductive board on the front side of the impression roller, which is electrically connected to a (highly) conductive layer. The (highly) conductive layer below the (semi) conductive layer ensures a uniform distribution of the charge over the length of the impression roller.
  • a "direct charging” takes place, for example, via wiper contacts or brushes on the circumference or an end face of the impression roller or via electrically conductive roller bearings which support a shaft of the impression roller or via which the impression roller is mounted on an axle.
  • the impression roller here consists of a metallic, electrically conductive material (for example steel) with a semiconducting layer on the circumference.
  • the (semi-) conductive layer on the periphery of the impression roller is e.g. rubber or polyurethane with embedded electrically conductive particles (e.g., graphite).
  • a (high) conductive layer can also be made of rubber or polyurethane with a correspondingly higher proportion of electrically conductive particles. This can also be a metallic layer.
  • An insulating layer is also produced, for example, from rubber or polyurethane, but with a correspondingly small number of electrically conductive particles or without electrically conductive particles.
  • Rotary printing machines usually have several successively arranged printing units in order to apply different colors to the substrate.
  • a disadvantage of these rotary printing presses is that as a result of the electrostatic charging by electrostatic printing aids, the printing substrate can assume very high charges, which impair subsequent processing. For example, when transporting or cutting a roll comprising the printed substrate, flashovers can occur which adversely affect the print shop workers. If the web-shaped substrate is cut and when working with sheets, it may be due to the high loads problems when stacking the blanks or sheets and removing individual blanks or sheets from the stacks as well Voltage flashovers occur that affect the printing workers. This is observed when using paper as a substrate and reinforced when using plastic film and composites comprising, for example, plastic, paper and aluminum foils.
  • the present invention seeks to provide a rotary printing machine with electrostatic printing aids available, which avoids unwanted charging of the printing material.
  • the rotary printing machine comprises a plurality of printing units arranged one behind the other in the direction of passage of the printing material, each having a printing cylinder and an electrostatic printing aid assigned thereto, the electrostatic printing aids having at least two printing couples having different polarities.
  • the rotary printing machine comprises for the first time electrostatic printing aids of different polarity, so that at least one electrostatic printing aid with negative and at least one electrostatic printing aid with positive polarity is present.
  • electrostatic printing aids of different polarity so that at least one electrostatic printing aid with negative and at least one electrostatic printing aid with positive polarity is present.
  • excessive charging of the printing material is counteracted.
  • Unwanted discharges of the printed substrate and impairments of the printing workers are avoided as a result.
  • the handling or further processing of the printed substrate is favored.
  • the rotary printing press is e.g. a high-pressure, planographic or screen printing machine.
  • it is a gravure printing machine.
  • it may be a web press or a sheetfed press.
  • the charge can be introduced to the printing gap in various ways. For example, it is possible to place a charging electrode in the vicinity of the printing nip, which is connected to a high voltage source.
  • the electrostatic printing aid comprises a pressure roller provided with at least one electrically (semi-) conductive outer layer, a device for transferring electrical charge to the outer layer of the impression roller and a high voltage source with a specific polarity connected to a device for transmitting electrical charge.
  • the electrostatic printing aid applies the charge to the printing nip via a impression roller.
  • the impression roller may consist altogether of electrically conductive and / or semiconductive material, to which the outer layer also belongs.
  • the impression roller can only have an electrically (semi-) conductive outer layer, which is arranged on an insulating core.
  • the impression rollers described above can be used.
  • the means for transmitting electrical charge transfers the electrical charge from the high voltage source to the outer layer.
  • the devices described in the introduction for transmitting electrical charge can be used (top-loading, side-charging or direct-charging systems). From the outer layer, the electrical charge reaches the pressure gap.
  • the electrostatic printing aids have different polarities in the direction of passage of the printing material of successive printing units.
  • the polarities change from printing unit to printing unit the electrostatic printing aids from negative to positive or vice versa. Accordingly, positive or negative charges are supplied to the nip.
  • a group of printing units with electrostatic printing aids of opposite polarity follows.
  • Gravure printing machines are also included in the invention, in which a part of the successive printing units in the passage direction electrostatic printing aids have different polarities and in which another part in the direction of passage of successive groups of printing units have different polarities.
  • electrostatic printing aids where the high voltage sources provide constant high voltages.
  • the electrostatic printing aids at least partially high voltage sources with adjustable high voltages and / or adjustable polarities. This makes it possible to optimize the high voltage or the polarity for each printing unit. In addition, adjustment depending on the selected substrate and / or environmental conditions (e.g., humidity) is possible.
  • the electrostatic printing aids have high voltages of at least a few 100 volts. According to a further embodiment, the high voltage is at least 1,000 volts. According to another embodiment, the high voltages are at least 5,000 volts. According to another embodiment, they are at least 10,000 volts.
  • the rotary printing press comprises at least four printing units arranged one behind the other. This allows, for example, a printing of the substrate with the primary colors blue, red, yellow and black. According to a further embodiment, the rotary printing press comprises at least six printing units arranged one behind the other. This allows, for example, an additional printing of the substrate with the two metal colors silver and gold.
  • the rotary printing press has at least twelve printing units arranged one behind the other. This allows in particular the additional printing of the substrate with special colors and / or gloss colors.
  • the gravure printing machine comprises twelve successively arranged printing units 1.1 to 1.12.
  • Each printing unit 1.1 to 1.12 has a metallic, electrically conductive printing cylinder 2.1 to 2.12, which rests on electrically conductive bearings to ground.
  • each printing unit 1.1 to 1.12 has an electrostatic printing aid 3.1 to 3.12.
  • Each electrostatic printing aid 3.1 to 3.12 has a impression roller 4.1 to 4.12, which is an impression cylinder, which rolls on the printing cylinder 2.1 to 2.12. Furthermore, each electrostatic printing aid 3.1 to 3.12 has a high voltage source 5.1 to 5.12. The high voltage of each high voltage source 5.1 to 5.12 is adjustable.
  • Each high voltage source 5.1 to 5.12 is grounded. Furthermore, each high-voltage source 5.1 to 5.12 is provided with a device for transferring electrical charge 6.1 to 6.12 on a impression roller 4.1 to 4.12. The device for transmitting electrical charge 6.1 to 6.12 is, for example, a charging electrode.
  • a printing material 8 between the printing cylinders 2.1 to 2.12 and impression rollers 4.1 to 4.12 successive printing units 1.1 to 1.12 passed.
  • deflecting and compensating rollers 9.1 to 9.11 are present between the printing units 1.1 to 1.12, over which the printing material 8 is carried away. Behind the printing units 1.1 to 1.12, the printing material 8 is stirred onto a winding roller 10.
  • the printing material 8 is unwound from the unwinding roller 7, passed through the printing units 1.1 to 1.12 and wound onto the take-up reel 10.
  • the printing units 1.1 to 1.12 it is printed with different colors.
  • the printing units 1.1 to 1.4 it is e.g. printed with the four primary colors blue, red, yellow and black.
  • the printing units 1.5 and 1.6 he is e.g. printed with the two metal colors silver and gold.
  • the printing units 1.7 to 1.12 he is e.g. printed with special colors and glossy colors.
  • the polarity of the high voltage sources 5.1 to 5.12 changes in the direction of passage of the printing material 8 of printing unit 1.1 to 1.12 to printing unit from negative to positive and vice versa. Accordingly, alternately charges of different polarity (minus or plus) are fed to the pressure gaps between the impression rollers 4.1 to 4.12 and the printing cylinders 2.1 to 2.12 via the means for transferring electrical charge 6.1 to 6.12 and the impression rollers 4.1 to 4.12 in the passage direction.
  • the quality of the gravure printing is improved, since the ink is almost completely taken out of the cups of the printing cylinders 2.1 to 2.12.
  • the alternating polarity there is no appreciable charging of the printing substrate 8 when it is wound onto the take-up reel 10 at the end of the gravure printing machine.
  • the handling, transport and further processing of the wound, printed substrate 8 is facilitated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)
EP07019595.3A 2006-10-19 2007-10-06 Presse rotative Active EP1914071B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07019595T PL1914071T3 (pl) 2006-10-19 2007-10-06 Rotacyjna maszyna drukująca

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006016178U DE202006016178U1 (de) 2006-10-19 2006-10-19 Rotationsdruckmaschine

Publications (3)

Publication Number Publication Date
EP1914071A2 true EP1914071A2 (fr) 2008-04-23
EP1914071A3 EP1914071A3 (fr) 2010-04-21
EP1914071B1 EP1914071B1 (fr) 2013-05-01

Family

ID=38904678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07019595.3A Active EP1914071B1 (fr) 2006-10-19 2007-10-06 Presse rotative

Country Status (5)

Country Link
EP (1) EP1914071B1 (fr)
DE (1) DE202006016178U1 (fr)
ES (1) ES2422156T3 (fr)
PL (1) PL1914071T3 (fr)
PT (1) PT1914071E (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015101468U1 (de) 2015-03-23 2016-06-24 Christa Dettke Rotationsdruckmaschine mit Einrichtungen zur Verringerung einer Aufladung des Bedruckstoffs
DE202016101601U1 (de) 2016-03-23 2017-06-27 Christa Dettke Aufwickelvorrichtung zum Aufwickeln eines im Wesentlichen isolierenden Bahnmaterials
CN109219525A (zh) * 2016-05-30 2019-01-15 Sig技术股份公司 用于具有多个印刷单元的尺寸稳定的食品和饮料制品容器的包装材料层压制件的静电辅助印刷
IT201900008466A1 (it) * 2019-06-10 2020-12-10 Ace Di Barbui Davide & Figli Srl Gruppo di stampa per stampa a rotocalco

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014103084U1 (de) 2014-07-04 2015-10-06 Christa Dettke Maschine zum Bearbeiten eines Bahnmaterials
DE102016209351A1 (de) * 2016-05-30 2017-11-30 Sig Technology Ag Elektrostatisch unterstütztes Bedrucken eines Packstofflaminats für formstabile Nahrungsmittelbehälter beinhaltend das gefaltete Packstofflaminat mit Auf- und Entladung
DE102016120383A1 (de) 2016-10-18 2018-04-19 Eltex-Elektrostatik Gmbh System zur verbesserung der druckqualität einer rotationsdruckmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554123A (en) * 1967-12-15 1971-01-12 Hurletron Inc Control of color densities and tones in multicolor printing
US5205212A (en) * 1989-03-17 1993-04-27 Wolfe Gene H Method of reducing ink electrets in gravure web printing
WO1998003049A2 (fr) * 1997-11-27 1998-01-29 Spengler Electronic Ag Dispositif electrostatique pour rotogravure et flexographie
EP1477310A1 (fr) * 2003-05-12 2004-11-17 BADINA ELECTROSTATIC Société Anonyme Machine d'impression, plus particulierement a heliogravure, comportant un dispositif d'assistance electrostaque

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554123A (en) * 1967-12-15 1971-01-12 Hurletron Inc Control of color densities and tones in multicolor printing
US5205212A (en) * 1989-03-17 1993-04-27 Wolfe Gene H Method of reducing ink electrets in gravure web printing
WO1998003049A2 (fr) * 1997-11-27 1998-01-29 Spengler Electronic Ag Dispositif electrostatique pour rotogravure et flexographie
EP1477310A1 (fr) * 2003-05-12 2004-11-17 BADINA ELECTROSTATIC Société Anonyme Machine d'impression, plus particulierement a heliogravure, comportant un dispositif d'assistance electrostaque

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015101468U1 (de) 2015-03-23 2016-06-24 Christa Dettke Rotationsdruckmaschine mit Einrichtungen zur Verringerung einer Aufladung des Bedruckstoffs
EP3072689A1 (fr) 2015-03-23 2016-09-28 Hubertus Dettke Presse rotative comprenant des dispositifs destines a reduire le chargement du support d'impression
DE202016101601U1 (de) 2016-03-23 2017-06-27 Christa Dettke Aufwickelvorrichtung zum Aufwickeln eines im Wesentlichen isolierenden Bahnmaterials
EP3222421A1 (fr) 2016-03-23 2017-09-27 Christa Dettke Enrouleur avec stockage d'une charge électrique d'un matériau en bande
US20170275115A1 (en) * 2016-03-23 2017-09-28 Hubertus Dettke Winding Device for Winding a Substantially Insulating Web Material
US10745230B2 (en) 2016-03-23 2020-08-18 Hubertus Dettke Winding device for winding a substantially insulating web material
CN109219525A (zh) * 2016-05-30 2019-01-15 Sig技术股份公司 用于具有多个印刷单元的尺寸稳定的食品和饮料制品容器的包装材料层压制件的静电辅助印刷
IT201900008466A1 (it) * 2019-06-10 2020-12-10 Ace Di Barbui Davide & Figli Srl Gruppo di stampa per stampa a rotocalco
EP3750710A1 (fr) * 2019-06-10 2020-12-16 Ace Di Barbui Davide & Figli S.R.L. Unité d'impression par rotogravure

Also Published As

Publication number Publication date
DE202006016178U1 (de) 2008-03-06
EP1914071A3 (fr) 2010-04-21
ES2422156T3 (es) 2013-09-09
EP1914071B1 (fr) 2013-05-01
PL1914071T3 (pl) 2013-09-30
PT1914071E (pt) 2013-07-24

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