EP0706885B1 - Verfahren zur Erzeugung einer fortdruckgerechten Farbschichtdicke in einem Farbwerk - Google Patents

Verfahren zur Erzeugung einer fortdruckgerechten Farbschichtdicke in einem Farbwerk Download PDF

Info

Publication number
EP0706885B1
EP0706885B1 EP95114700A EP95114700A EP0706885B1 EP 0706885 B1 EP0706885 B1 EP 0706885B1 EP 95114700 A EP95114700 A EP 95114700A EP 95114700 A EP95114700 A EP 95114700A EP 0706885 B1 EP0706885 B1 EP 0706885B1
Authority
EP
European Patent Office
Prior art keywords
ink
printing
layer thickness
inking unit
rollers
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.)
Expired - Lifetime
Application number
EP95114700A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0706885A1 (de
Inventor
Joachim Müller
Rolf Braun
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 to DE9421436U priority Critical patent/DE9421436U1/de
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0706885A1 publication Critical patent/EP0706885A1/de
Application granted granted Critical
Publication of EP0706885B1 publication Critical patent/EP0706885B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • the invention relates to a method for producing a printing ink layer thickness in an inking unit.
  • the method shown for the defined generation of a color distribution close to production in the inking unit of rotary printing presses has the process steps that between two print jobs the ink present in the inking unit is first reduced to a minimal amount by closing the ink metering elements and only then is the ink zone distribution corrected for the production process.
  • the difference in color quantity between the two print jobs is to be determined by means of a computer and compensated for by appropriate setting of the color metering elements. This can result in transport routes from the inking unit to the ink fountain as well as in the opposite direction.
  • the procedure given in this way is limited to the sequence between two printing processes. It is primarily based on the dismantling of the existing paint layer thickness profile, which usually differs from a profile required in a follow-up order.
  • a pre-filling of the inking unit that is correct for the printing process can be produced without determining color quantities or color profiles or difference quantities.
  • the procedure boils down to the fact that a compensating layer thickness is generated in the inking unit, which can be produced by a running-in process that runs parallel to other setting-up processes.
  • the compensation layer thickness depends primarily on the design of the inking unit.
  • the compensation layer thickness is also dependent on the color requirement on the respective subject or also on the auxiliaries used in the printing process, such as printing ink and paper.
  • a parameter table can be specified, which contains measurement values from the scanning of a printing plate or the determination of ink requirements from digital data, as well as the empirical values of the operator.
  • the transport of printing ink during a printing process in a printing press involves an ink fountain with ink metering elements arranged zonally across the width of the ink fountain, an ink fountain roller, a lifting or transfer roller, a larger number of ink fountain rollers in the form of a roller train and a printing form cylinder.
  • a distribution of the printing ink is generated on the inking unit rollers in accordance with the ink requirement on the printing form. The distribution results in the direction of the ink transport through splitting processes between the inking unit rollers and in the transverse direction of the inking unit through defined setting of the ink metering elements and transport processes by means of a so-called ink distribution.
  • the process for prefilling the inking unit assumes that a profiling of the amount of ink in the inking unit is generally not necessary before a print job, both before a first print job and between two print jobs. It is basically only necessary to distribute an ink layer with a certain volume within the inking unit, ie on the inking unit rollers. Therefore, before a new print job, the printing ink can be supplied in an even layer of ink, ie with evenly opened ink metering elements. In general, the printing ink is distributed according to the principle of the layer thickness gradient, ie from thicker to thinner layers of ink.
  • the printing press continues to run without any ink for pragmatic reasons.
  • the ink transport from the ink fountain to the inking unit rollers and from there to the printing form cylinder is interrupted.
  • the differences in the ink layer thickness on the rotating inking unit rollers will compensate relatively quickly across the entire inking unit. This is due to the above-mentioned principal color flows from higher to lower layer thicknesses. This compensation process results in a layer thickness on the inking unit rollers, which is to be referred to as the compensation layer thickness.
  • the compensating layer thickness is set and fed in advance using the adjusting means provided in a printing press.
  • the compensation layer thickness must be determined. Basically, a dependency on the amount of printing ink with regard to consumption on the printing sheet is to be noted.
  • the subjects can be divided into groups or classes, for example with the characterizations light, medium and difficult.
  • the subject groups or classes can be divided, for example, depending on a measurement of the printing components on the printing form, a percentage of area coverage, in the following manner: from 0-20% for light subjects, from 21-50% for medium subjects and greater than 50% for heavy subjects.
  • Certain compensating layer thicknesses are permanently assigned to each subject group, which are to be determined in accordance with the design of the respective printing press. For this purpose, the amount of ink present in the inking unit during the continuous printing process is determined in a specific printing press.
  • the printer makes the selection before the print job, whether the characterization is easy, medium or difficult to use as a subject group. This is where his experience for the printing process comes in. Alternatively, it can of course also be carried out automatically as a function of a previously carried out measurement of the printing parts on the printing form, the so-called area coverage.
  • the compensation layer thickness can of course also be calculated mathematically directly from a model of the inking unit according to the color requirement.
  • This compensating layer thickness on the basis of a layer thickness profile that can be adjusted on the ink metering elements and a color strip, an adjustable so-called lifting strip, to be removed periodically from the ink fountain roller by means of the lifting roller.
  • the second step is to apply the compensation layer thickness to all inking rollers.
  • a precise measure in micrometers
  • the ink metering elements can also be adjusted precisely to specific gap openings.
  • the press is then started up without paper transport, with the ink supply switched on via the ink lifter and ink fountain roller. This begins a compensation process in which a color flow takes place from high to low layer thickness, which theoretically is completed after an infinite number of revolutions. In practice, however, 300 revolutions are definitely sufficient. This means that the leveling layer thickness set on the ink metering elements is on all rollers. It is irrelevant whether the rollers were clean before or whether they still had ink from the last print job. If color layers are still present, as already explained, printing ink can also be transported back to the ink fountain.
  • the process is optimal, with an equalization process having already taken place after a relatively few revolutions of the printing machine, if the lifting strip is selected to the maximum, which means that the ink flow is also shown to the maximum. This can take place at high machine speeds, so that the required number of revolutions is completed in a short time.
  • a running-in process would e.g. with a machine speed of 15000 U / h and a preselection of 300 revolutions for the running-in process take 72 sec.
  • a connection between the inking unit and the dampening unit is usually provided in order to be able to better control the ink-water balance during the printing process.
  • it is important to include this connection in the proposed running-in process since it may also be necessary to supply a dampening roller with printing ink. This is done via a switchable roller connection between the inking unit and dampening unit.
  • substrates or printing inks it can be disadvantageous if the ink is enriched too early on the dampening roller. A Emulsion formation can hinder the printing process. Therefore, the method also provides for the switchable connection to be operated independently of the other setting values when the compensation layer is applied to printing ink.
  • the printer makes this setting itself.
  • a further advantageous development of the method according to the invention can be achieved in this context on offset printing presses in that after the running-in process, the inking rollers are placed briefly on the forme cylinder without the dampening rollers being turned on. The printing form is then completely covered with printing ink. After the inking rollers are switched off again, the dampening rollers are now placed on the forme cylinder.
  • the amount of dampening solution introduced and the color-friendly surface characteristics of at least the dampening application rollers remove the printing ink from the non-printing surface areas of the printing form.
  • free running When freewheeling, the dampening rollers are simultaneously supplied with printing ink, so that the required basic ink layer can be produced there in a simple manner.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet (AREA)
EP95114700A 1994-04-14 1995-09-19 Verfahren zur Erzeugung einer fortdruckgerechten Farbschichtdicke in einem Farbwerk Expired - Lifetime EP0706885B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9421436U DE9421436U1 (de) 1994-04-14 1994-04-14 Vorrichtung zur Schalldämmung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4436953 1994-10-15
DE4436953A DE4436953C1 (de) 1994-10-15 1994-10-15 Verfahren zur Erzeugung einer Farbschichtdickenverteilung auf Farbwerkwalzen eines Farbwerkes einer Druckmaschine

Publications (2)

Publication Number Publication Date
EP0706885A1 EP0706885A1 (de) 1996-04-17
EP0706885B1 true EP0706885B1 (de) 1997-06-04

Family

ID=6530902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114700A Expired - Lifetime EP0706885B1 (de) 1994-04-14 1995-09-19 Verfahren zur Erzeugung einer fortdruckgerechten Farbschichtdicke in einem Farbwerk

Country Status (5)

Country Link
US (1) US5590599A (ja)
EP (1) EP0706885B1 (ja)
JP (1) JP3459321B2 (ja)
AT (1) ATE153914T1 (ja)
DE (2) DE4436953C1 (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19615156B4 (de) * 1996-04-17 2007-12-27 Man Roland Druckmaschinen Ag Verfahren zur Versorgung einer Druckmaschine mit Farbe
JPH1016193A (ja) * 1996-06-27 1998-01-20 Komori Corp インキ膜厚の制御方法
DE19800475A1 (de) * 1998-01-09 1999-07-15 Koenig & Bauer Ag Verfahren und Einrichtung zur Beeinflussung der Farbverteilung
DE19801623B4 (de) * 1998-01-17 2004-02-05 Man Roland Druckmaschinen Ag Verfahren zum Betrieb einer Offset-Rotationsdruckmaschine
DE29807277U1 (de) * 1998-04-22 1998-07-02 MAN Roland Druckmaschinen AG, 63075 Offenbach Steuerung für ein Heberfarbwerk einer Druckmaschine
DE59904832D1 (de) * 1998-12-11 2003-05-08 Koenig & Bauer Ag Verfahren zum Einstellen eines Fortdruckfarbprofils
DE19857219C2 (de) * 1998-12-11 2001-12-13 Koenig & Bauer Ag Verfahren zum Einstellen eines Fortdruckfarbprofils
DE19857218C2 (de) * 1998-12-11 2001-12-13 Koenig & Bauer Ag Verfahren zum Einstellen eines Fortdruckfarbprofils
DE10056248A1 (de) * 1999-12-06 2001-06-07 Heidelberger Druckmasch Ag Verfahren zum Steuern der Farbmenge in einem Farbwerk
DE10159698B4 (de) * 2000-12-14 2015-03-26 Heidelberger Druckmaschinen Ag Verfahren zum Einstellen einer Farbmenge, die einem Druckzylinder einer Druckmaschine zugeführt wird
DE10115121B4 (de) * 2001-03-27 2005-11-17 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zur Erzeugung einer Farbverteilung im Farbwerk von Druckmaschinen
DE10225244B4 (de) * 2002-06-07 2016-02-04 Koenig & Bauer Ag Verfahren zum Anfahren des Fortdrucks nach einer Druckunterbrechung
JP4064882B2 (ja) * 2003-07-07 2008-03-19 リョービ株式会社 印刷機のインキ量制御装置
JP3976727B2 (ja) * 2003-12-08 2007-09-19 リョービ株式会社 印刷機のインキ練り方法及び印刷機
DE102005013634A1 (de) * 2005-03-24 2006-09-28 Man Roland Druckmaschinen Ag Verfahren zum Betrieb einer Druckmaschine
EP1728628A1 (en) * 2005-06-01 2006-12-06 Kba-Giori S.A. Typographic printing machine with independent drive means
DE102007029341A1 (de) * 2007-06-26 2009-01-15 Maschinenfabrik Wifag Verfahren und Vorrichtung zum Auftragen eines Feuchtmittels oder einer Farbe
DE102009027383A1 (de) 2009-07-01 2011-01-05 Manroland Ag Verfahren zur Bestimmung von Voreinstellparametern für ein Farbwerk
DE102009027384A1 (de) 2009-07-01 2011-01-05 Manroland Ag Verfahren zur Bestimmung von Voreinstellparametern für ein Farbwerk

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3338143C2 (de) * 1983-10-20 1986-12-18 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Verfahren zur Erzeugung einer dem Druckbild entsprechenden Farbschichtstärke im Farbwerk einer Druckmaschine
DE3707695A1 (de) * 1987-03-11 1988-09-22 Heidelberger Druckmasch Ag Verfahren zur definierten erzeugung einer dem fortdruck nahen farbverteilung im farbwerk von rotationsdruckmaschinen
US5148747A (en) * 1989-06-19 1992-09-22 Heidelberger Druckmaschinen Ag Process for setting a production run ink zone profile
EP0403861B1 (de) * 1989-06-19 1994-08-31 Heidelberger Druckmaschinen Aktiengesellschaft Verfahren zum schnellen Erreichen des Fortdruckzustandes
DE4013463A1 (de) * 1990-04-27 1991-11-07 Heidelberger Druckmasch Ag Praeparation des farbwerks einer druckmaschine bei druckauftragswechsel
JP3068210B2 (ja) * 1990-12-06 2000-07-24 三菱重工業株式会社 インキ供給量制御装置

Also Published As

Publication number Publication date
DE4436953C1 (de) 1996-05-15
DE59500288D1 (de) 1997-07-10
JPH08183167A (ja) 1996-07-16
JP3459321B2 (ja) 2003-10-20
EP0706885A1 (de) 1996-04-17
ATE153914T1 (de) 1997-06-15
US5590599A (en) 1997-01-07

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