EP0985530B2 - Dispositif d'encrage comprenant un rouleau tocheur-encreur pour la réduction de l'encre moutonnant - Google Patents

Dispositif d'encrage comprenant un rouleau tocheur-encreur pour la réduction de l'encre moutonnant Download PDF

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Publication number
EP0985530B2
EP0985530B2 EP99114183A EP99114183A EP0985530B2 EP 0985530 B2 EP0985530 B2 EP 0985530B2 EP 99114183 A EP99114183 A EP 99114183A EP 99114183 A EP99114183 A EP 99114183A EP 0985530 B2 EP0985530 B2 EP 0985530B2
Authority
EP
European Patent Office
Prior art keywords
ink
inking
shore
roller
plate cylinder
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
EP99114183A
Other languages
German (de)
English (en)
Other versions
EP0985530B1 (fr
EP0985530A3 (fr
EP0985530A2 (fr
Inventor
Edward Ellis Urguhart
James Brian Vrotacoe
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.)
Goss International Americas LLC
Original Assignee
Goss International Americas LLC
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Filing date
Publication date
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Application filed by Goss International Americas LLC filed Critical Goss International Americas LLC
Publication of EP0985530A2 publication Critical patent/EP0985530A2/fr
Publication of EP0985530A3 publication Critical patent/EP0985530A3/fr
Publication of EP0985530B1 publication Critical patent/EP0985530B1/fr
Application granted granted Critical
Publication of EP0985530B2 publication Critical patent/EP0985530B2/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers

Definitions

  • the present invention relates to an inking unit in a rotary offset printing machine with an inking roller according to the preamble of claim 1, by means of which the beads of the solids contained in printing inks is reduced.
  • Prior art offset printing machines comprise a plate cylinder having on its surface the image to be printed. This is in rolling contact with a transfer or blanket cylinder, by means of which the image contained on the plate cylinder is transferred to the web or the sheet.
  • the plate cylinder is supplied with ink, which is then transferred to the blanket cylinder and then to the web / sheet.
  • ink supply to the plate cylinder can be accomplished in a variety of ways, most commonly using a color box, i. H. a device in which a ink fountain roller on a container containing ink, the ink fountain, is arranged.
  • a series of ink fountain keys At the interface between the ink fountain floor and the ink fountain roller are a series of ink fountain keys that can be moved toward and away from the ink fountain roller.
  • the spacing of a respective ink fountain key from the ink fountain roller surface determines the thickness of the ink transferred to the outer surface of the ink fountain roller.
  • a metering roller is arranged downstream of the ink fountain key in the direction of rotation.
  • the metering roller leads from one or more rollers, for.
  • the ink is transferred to the plate cylinder via the inking roller.
  • inking rollers have an elastic, relatively soft outer surface made of an elastomer whose hardness is in the range between 22 and 28 Shore A (durometer).
  • the outer surface is also cylindrical and has a uniform outer diameter.
  • an offset printing unit which comprises a blanket cylinder, a plate cylinder, and an inking cylinder having a compliant working surface.
  • a layer of an elastic, ink-accepting material is applied on the inking cylinder. The hardness of this layer is 60 to 70 Shore.
  • an inking roller is known that is designed to reduce the risk of inflammation or loss of ink.
  • a rubber coating is applied along a central region of the cylinder, wherein no rubber coating is provided at the end regions of the cylinder.
  • a drawback encountered in offset printing machines of the prior art is that the solids contained in the ink bead. This results in an uneven ink application to the paper surface, creating a spotty image along the image surface of varying optical density. To compensate for this effect, it has often been necessary in the prior art to increase the amount of ink transferred to the paper.
  • the present invention relates to a device which reduces the beading of the solids contained in printing inks. In this way, the print quality of a printing press is significantly improved by the present invention by a uniform distribution of the color solids is achieved on the entire print image. Furthermore, the present invention achieves a uniform optical density of the printed image with less ink consumption.
  • one or more rollers whose outer surface consists of an elastomer having a hardness between 60 and 90 Shore A (durometer) or between 50 and 100 Shore A (durometer) are used as the inking rollers.
  • the use of such an inking roller ensures a more uniform application of ink to the plate cylinder and thus to the blanket cylinder and the web to be printed.
  • at least the inking roller, which contacts the plate cylinder in the direction of rotation last, is formed as an inking roller with a hard outer surface made of an elastomer.
  • Significantly improved printing results can be achieved, however, if all the inking rollers are designed in this way.
  • the inking roller has a convex shape axially along its length so that the diameter of the hard surface of an elastomer in the axial center is greater than at the axial ends, whereby an optimum contact between the Ink rollers and the plate cylinder is guaranteed.
  • the present invention further relates to a printing machine, with the low ink consumption high print quality and a uniform optical density can be achieved because the ink is applied evenly to the plate cylinder by the inking rollers according to the invention and thus less color must be applied to achieve a certain print quality , Accordingly, the present invention provides an improvement over prior art printing machines in which significantly more color must be used to achieve a given print quality.
  • Fig. 1 shows a schematic representation of a printing press according to the present invention.
  • a material web W, z. B. of paper moves in a manner in the direction of the arrow between a rotating in the direction of arrow upper blanket cylinder B U and a rotating in the direction of arrow lower blanket cylinder B L through that it contacts the two cylinders.
  • On the blanket cylinder B U and B L can each be applied a blanket 12.
  • the plate cylinder and the inking unit by means of which the colored image is transferred to the upper blanket cylinder B U , are not shown.
  • These components are the same or similar to the lower blanket cylinder B L associated components.
  • the inking rollers F 1 , F 2 , F 3 can be fed by any known inking color; in Fig. 1 an inking roller 1 is shown, through which the ink is transferred to the plate cylinder P, which then transmits a colored image on the lower blanket cylinder B L.
  • a rotating ink fountain roller I adjoins an ink fountain 10 and takes from this in a known manner to a color layer, which then transfers them to a metering roll M.
  • the metering roller M By the metering roller M, the ink layer on a series of transfer rollers D and then on the distributor rollers V, a (vibrating) intermediate roller S and a large transfer roller L is transferred.
  • the ink is transferred to one or more inking rollers F 1 , F 2 , F 3 .
  • the inking rollers F 1 , F 2 , F 3 transfer a color layer on the plate cylinder P, but not necessarily three inking rollers must be provided, but the number of inking rollers can be chosen arbitrarily.
  • the printing machine according to the present invention may comprise a downstream in the direction of rotation of the plate cylinder the blanket cylinder B L dampening unit 2, which can be used for wetting the plate cylinder P.
  • a pressure plate 11 is arranged in a known manner, which transmits a colored image on the lower blanket cylinder B L , with which this then the web W imprinted.
  • the inking rollers F 1 , F 2 , F 3 are used to control the thickness and the type of ink layer to be transferred to the plate cylinder P and accordingly the quality of the color printed image on the web W.
  • Fig. 2 and 3 show two embodiments of an inking roller F 1 , F 2 or F 3 according to the invention, the inner core 30 of a relatively strong, rigid material such. As steel.
  • the inner core 30 is preferably hollow to reduce weight and may have pivots 22 for rotatably mounting the inking roll F 1 , F 2 or F 3 at both ends.
  • the hollow core 30 may comprise a suitable cooling mechanism, e.g. B. a cooling liquid channel to avoid overheating of the inking roller F 1 , F 2 or F 3 during the continuous printing operation.
  • At least a portion of the axial length of the inner core 30 is an outer layer 21 made of an elastomer, for. B. Buna® rubber compound or other suitable compressible material applied.
  • the elastomer constituting the outer layer 21 is made relatively hard, that is, having a hardness of 50-100 Shore A, preferably between about 60 and 90 Shore A (durometer), more preferably about 80 Shore A (durometer).
  • the increased hardness of the outer layer 21 brings improved printing results, as it causes a finer and more uniform color separation between the plate cylinder P and the inking rollers F 1 , F 2 or F 3 .
  • the improved color splitting results in an improved deposition of the color solids on the web W after the transfer of the ink from the plate cylinder P to the blanket cylinder B L , resulting in a high quality printed image of high optical density with less ink consumption than conventional printing machines.
  • the inking roller F 1 , F 2 or F 3 along its axial length has a convex shape, so that the diameter d 1 at the ends of the outer layer 21 is smaller than the diameter d 2 at the axial center of the outer layer 21st
  • the degree of camber ie the shape of the curve forming the outside diameter of the outer layer 21, may be determined by standard beam displacement algorithms or computer models depending on the axial length, diameter and materials of the inking rollers F 1 , F 2 and F 3 are determined.
  • the temperature of the inking rollers F 1 , F 2 or F 3 may increase. Therefore, it may be advantageous to use a (not shown) inking roller cooling system z. B. in the form of coolant channels in the cavity in the interior of the inking rollers F 1 , F 2 or F 3 provide.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Cleaning In Electrography (AREA)
  • Rotary Presses (AREA)

Claims (6)

  1. Dispositif d'encrage dans une machine à imprimer offset rotative comprenant au moins un rouleau toucheur d'encrage (F1, F2, F3) qui est disposé contre un cylindre porte-plaque (P), le rouleau d'encrage (F1, F2, F3) présentant un noyau interne (30) et une couche extérieure (21), caractérisé en ce qu'il est prévu plusieurs rouleaux toucheurs d'encrage (F1, F2, F3) à la périphérie du cylindre porte-plaque (P), qui transfèrent une couche de couleur sur le cylindre porte-plaque, le rouleau toucheur d'encrage (F3) disposé le dernier dans le sens de la rotation de la périphérie du cylindre porte-plaque (P) présentant une couche extérieure (21) ayant une dureté comprise dans l'intervalle d'entre 50 Shore A et 100 Shore A, et en ce que la surface extérieure de la couche extérieure (21) présente une forme convexe selon la longueur axiale de la couche extérieure (21).
  2. Dispositif d'encrage selon la revendication 1, caractérisé en ce que la dureté de la couche extérieure (21) est à peu près entre 60 Shore A et 90 Shore A et est en particulier de 80 Shore A.
  3. Dispositif d'encrage selon une des revendications précédentes, caractérisé en ce que la couche extérieure (21) contient un élastomère, par exemple du caoutchouc.
  4. Dispositif d'encrage selon une des revendications 1 à 3, caractérisé en ce que les rouleaux toucheurs d'encrage (F1, F2) qui sont disposés avant le dernier rouleau toucheur d'encrage (F3) dans le sens de rotation de la périphérie du cylindre porte-plaque (P) et présentent une couche extérieure (21) qui possède une plus faible dureté, comprise dans l'intervalle d'entre 20 Shore A et 40 Shore A, en particulier dans l'intervalle de 27 à 35 Shore A.
  5. Dispositif d'encrage selon une des revendications 1 à 3, caractérisé en ce que les rouleaux toucheurs d'encrage (F1, F2) qui sont disposés avant le dernier rouleau toucheur d'encrage (F3) dans le sens de rotation de la périphérie du cylindre porte-plaque (P) et présentent une couche extérieure (21) qui présente une dureté comprise dans l'intervalle d'entre 50 et 100 Shore A.
  6. Machine à imprimer équipée d'un dispositif d'encrage selon une des revendications précédentes.
EP99114183A 1998-08-10 1999-07-22 Dispositif d'encrage comprenant un rouleau tocheur-encreur pour la réduction de l'encre moutonnant Expired - Lifetime EP0985530B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/131,564 US6098540A (en) 1998-08-10 1998-08-10 Apparatus and method for reducing mottling in printing presses
US131564 1998-08-10

Publications (4)

Publication Number Publication Date
EP0985530A2 EP0985530A2 (fr) 2000-03-15
EP0985530A3 EP0985530A3 (fr) 2000-10-04
EP0985530B1 EP0985530B1 (fr) 2003-09-24
EP0985530B2 true EP0985530B2 (fr) 2009-01-14

Family

ID=22450006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99114183A Expired - Lifetime EP0985530B2 (fr) 1998-08-10 1999-07-22 Dispositif d'encrage comprenant un rouleau tocheur-encreur pour la réduction de l'encre moutonnant

Country Status (5)

Country Link
US (1) US6098540A (fr)
EP (1) EP0985530B2 (fr)
JP (1) JP2000052625A (fr)
CN (1) CN1131780C (fr)
DE (2) DE19934395B4 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19911180C2 (de) * 1999-03-12 2001-02-01 Koenig & Bauer Ag Druckwerk für eine Rotationsdruckmaschine
US7055428B2 (en) * 2002-04-11 2006-06-06 Koenig & Bauer Aktiengesellschaft Characterization, determination of a characteristic number and selection of suitable dressings on cylinders of a printing press
WO2005118293A1 (fr) * 2004-05-21 2005-12-15 Demaxz, L.L.C. Appareil conçu pour imprimer sur des substrats en bois ou en matiere synthetique
CN1939721B (zh) * 2005-09-27 2010-12-15 海德堡印刷机械股份公司 用于对印刷机调节温度的方法
DE102006015481B4 (de) * 2006-01-04 2009-07-09 Koenig & Bauer Aktiengesellschaft Walze einer Druckmaschine
DE102006011477B4 (de) * 2006-03-13 2007-12-27 Koenig & Bauer Aktiengesellschaft Druckwerk mit einem geteilten Formzylinder
CN101045367A (zh) * 2006-03-28 2007-10-03 海德堡印刷机械股份公司 网纹辊印刷装置
DE102006015490B4 (de) * 2006-04-03 2009-11-12 Koenig & Bauer Aktiengesellschaft Rollendruckmaschine mit einem Filmfarbwerk
DE102006015482B4 (de) * 2006-04-03 2010-06-24 Koenig & Bauer Aktiengesellschaft Walze einer Druckmaschine
DE102006046521A1 (de) * 2006-09-29 2008-04-03 Man Roland Druckmaschinen Ag Druckwerk einer Druckmaschine
US8726807B2 (en) * 2007-06-04 2014-05-20 Goss International Americas, Inc. Smooth roller with low line load and methods
US20120279407A1 (en) * 2011-05-06 2012-11-08 Phoenix Machinery Paper coater apparatus and process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013761A1 (fr) † 1990-03-03 1991-09-19 Albert-Frankenthal Aktiengesellschaft Mecanisme d'encrage court pour rotative
US5165341A (en) † 1989-07-06 1992-11-24 Man Roland Druckmaschinen Ag Offset printing machine
DE9310713U1 (de) † 1993-07-17 1993-09-02 Man Roland Druckmaschinen Ag, 63069 Offenbach Farbauftragwalze
DE4436973A1 (de) † 1993-12-21 1995-06-22 Heidelberger Druckmasch Ag Gummituch mit variierendem Profil

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
CH355786A (de) * 1958-01-24 1961-07-31 Winkler Fallert & Co Maschf Maschine zum Bedrucken von Papier und andern Stoffen in Bahnen mittels Tiefdruckwalzen
DE6910823U (de) * 1969-03-17 1969-07-03 Maschf Augsburg Nuernberg Ag Filmwalze oder dgl. fuer farbwerke von rotationsdruckmaschinen
US3828674A (en) * 1972-03-01 1974-08-13 Houston Chronicle Publishing C Printing press ink suppression apparatus
JPS5549295A (en) * 1978-10-05 1980-04-09 Toray Ind Inc Ink roller for dry lithographic printing
DE3705194A1 (de) * 1987-02-19 1988-09-01 Frankenthal Ag Albert Farbwerk
WO1989005732A1 (fr) * 1987-12-21 1989-06-29 Kinyosha Co., Ltd Rouleau encreur pour presse d'imprimerie et fabrication dudit rouleau
JPH0422980A (ja) * 1990-05-18 1992-01-27 Canon Inc 画像形成装置
DE4103742C2 (de) * 1991-02-07 1994-07-14 Roland Man Druckmasch Einstellbare Feuchtwerks- oder Farbwerkswalze
US5816150A (en) * 1993-02-24 1998-10-06 Sarda; Jean Lucien Dampening units of offset printing presses
JP2951542B2 (ja) * 1994-06-30 1999-09-20 日本ボールドウィン株式会社 冷却装置を有するローラ
DE29612105U1 (de) * 1996-07-11 1996-08-22 Man Roland Druckmaschinen Ag, 63069 Offenbach Walze in einer Druckmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165341A (en) † 1989-07-06 1992-11-24 Man Roland Druckmaschinen Ag Offset printing machine
WO1991013761A1 (fr) † 1990-03-03 1991-09-19 Albert-Frankenthal Aktiengesellschaft Mecanisme d'encrage court pour rotative
DE9310713U1 (de) † 1993-07-17 1993-09-02 Man Roland Druckmaschinen Ag, 63069 Offenbach Farbauftragwalze
DE4436973A1 (de) † 1993-12-21 1995-06-22 Heidelberger Druckmasch Ag Gummituch mit variierendem Profil

Also Published As

Publication number Publication date
CN1244462A (zh) 2000-02-16
EP0985530B1 (fr) 2003-09-24
DE19934395B4 (de) 2012-11-08
DE59907097D1 (de) 2003-10-30
HK1023095A1 (en) 2000-09-01
US6098540A (en) 2000-08-08
CN1131780C (zh) 2003-12-24
JP2000052625A (ja) 2000-02-22
EP0985530A3 (fr) 2000-10-04
DE19934395A1 (de) 2000-02-17
EP0985530A2 (fr) 2000-03-15

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