EP0985530B1 - 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
EP0985530B1
EP0985530B1 EP99114183A EP99114183A EP0985530B1 EP 0985530 B1 EP0985530 B1 EP 0985530B1 EP 99114183 A EP99114183 A EP 99114183A EP 99114183 A EP99114183 A EP 99114183A EP 0985530 B1 EP0985530 B1 EP 0985530B1
Authority
EP
European Patent Office
Prior art keywords
ink
roller
inking
shore
outer layer
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
EP0985530A2 (fr
EP0985530A3 (fr
EP0985530B2 (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
Heidelberger 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
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
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
Anticipated expiration legal-status Critical
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 press with an inking roller according to the preamble of claim 1, by means of which the Pearls of the solids contained in printing inks is reduced.
  • Prior art offset printing machines comprise a plate cylinder the surface of which contains the image to be printed. This is in rolling contact with a transfer or blanket cylinder, by means of which the the image contained in the plate cylinder is transferred to the web or the sheet. the Plate cylinder is fed paint, which then transfer to the blanket cylinder and then to the web / sheet becomes.
  • the ink supply to the plate cylinder can be varied Way, most often using a color box, i. H. one Device in which an ink fountain roller on a container containing printing ink, the ink fountain. At the interface between the ink fountain base and the ink fountain roller are a number of ink fountain keys, which on the Ink fountain roller to and from this can be moved. The distance one The respective ink zone screw from the ink fountain roller surface determines the thickness the ink transferred to the outside surface of the ink fountain roller. In close proximity to the ink fountain roller is a metering roller beyond the ink fountain keys in the direction of rotation downstream.
  • the metering roller leads one of one or more rollers, e.g. B. friction rollers, Lifter rollers, intermediate rollers and inking rollers existing ink roller color to.
  • 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, the hardness in the range between 22 and 28 Shore A (Durometer) lies.
  • the outer surface is also cylindrical and has one uniform outer diameter.
  • An offset printing unit is known from EP 406 737 A2, which comprises a blanket cylinder, a plate cylinder and an inking cylinder having a compliant Has desktop. There is a layer of one on the inking cylinder elastic, color-accepting material applied. The hardness of this layer is 60 to 70 shore.
  • the present invention relates to a device by which the beading of the in Solids contained in printing inks is reduced. In this way, the The present invention significantly improves the printing quality of a printing press by an even distribution of the ink solids is achieved over the entire printed image. Furthermore, the present invention uses less ink achieved uniform optical density of the printed image.
  • one or more are used as inking rollers Rollers used, the outer surface of which is made of an elastomer, which is a Hardness between 60 and 90 Shore A (durometer) or between 50 and 100 Shore A (Durometer).
  • the use of such an inking roller ensures one more even paint application on the plate cylinder and thus on the Blanket cylinder and the web to be printed.
  • Is more than an inking roller is provided, so is at least the inking roller that the plate cylinder contacted last in the direction of rotation, as an inking roller with a hard one Outer surface made of an elastomer.
  • Significantly improved printing results can be achieved, however, if all inking rollers are designed in this way.
  • the inking rollers can axially along their length have a convex shape so that the diameter of the hard Surface made of an elastomer is larger in the axial center than at the axial ends, which ensures optimal contact between the inking rollers and the plate cylinder is guaranteed.
  • the present invention further relates to a printing machine with which at low Color consumption achieved a high print quality and a uniform optical density can be, since the printing ink by the inking rollers according to the invention is evenly applied to the plate cylinder and thus to achieve a certain print quality less color needs to be applied. Accordingly means the present invention is an improvement over prior art printing presses the technology in which to achieve a certain print quality much more Color must be used.
  • Fig. 1 shows a schematic representation of a printing press according to the present invention.
  • a web of material W e.g. B. made of paper
  • a rubber blanket 12 can be applied to each of the rubber blanket cylinders B U and B L.
  • 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 identical or similar to the components assigned to the lower blanket cylinder B L.
  • the ink application rollers F 1 , F 2 , F 3 can be supplied with ink by any known inking unit; 1 shows an inking roller train 1, through which the ink is transferred to the plate cylinder P, which then transfers a color image to the lower blanket cylinder B L.
  • a rotating ink fountain roller I adjoins an ink fountain 10 and takes up an ink layer therefrom in a known manner, which then transfers it to a metering roller M.
  • the ink layer is transferred to a row of transfer rollers D and then to the friction rollers V, a (vibrating) intermediate roller S and a large transfer roller L.
  • the ink is transferred from the friction rollers V to one or more inking rollers F 1 , F 2 , F 3 .
  • the inking rollers F 1 , F 2 , F 3 transfer an ink layer to the plate cylinder P, although it is not absolutely necessary to provide three inking rollers, but the number of inking rollers can be chosen as desired.
  • the printing press according to the present invention can comprise a dampening unit 2 which is arranged downstream of the blanket cylinder B L in the direction of rotation of the plate cylinder and which can be used for moistening the plate cylinder P.
  • a printing plate 11 is arranged in a known manner, which transfers a colored image to the lower blanket cylinder B L , with which the latter then prints on the web W.
  • the thickness and the type of the ink layer to be transferred to the plate cylinder P and accordingly the quality of the colored print image on the web W are controlled via the ink application rollers F 1 , F 2 , F 3 .
  • FIGS. 2 and 3 show two embodiments of an inking roller F 1 , F 2 or F 3 according to the invention, which have an inner core 30 made of a relatively strong, rigid material such as. B. steel.
  • the inner core 30 is preferably hollow to reduce the weight and can have pins 22 at both ends for the rotatable fastening of the inking roller F 1 , F 2 or F 3 .
  • Hollow core 30 may include an appropriate cooling mechanism, e.g. B. a coolant channel to avoid overheating of the inking roller F 1 , F 2 or F 3 during production printing.
  • At least part of the axial length of the inner core 30 is an outer layer 21 made of an elastomer, e.g. B. Buna® rubber compound or another suitable compressible material.
  • the elastomer from which the outer layer 21 is made is relatively hard, ie with a hardness of 50-100 Shore A, preferably between approximately 60 and 90 Shore A (durometer), in particular approximately 80 Shore A (durometer).
  • the increased hardness of the outer layer 21 brings improved printing results because it causes a finer and more uniform ink splitting between the plate cylinder P and the inking rollers F 1 , F 2 or F 3 .
  • the improved ink splitting leads to an improved deposition of the ink solids on the material web W after the transfer of the ink from the plate cylinder P to the blanket cylinder B L , which results in a high-quality print image with high optical density with less ink consumption than in conventional printing presses.
  • the outer layer 21 of the inking roller F1, F2 or F3 Due to the increased hardness of the outer layer 21 of the inking roller F1, F2 or F3 according to the invention, it is stiffer and less flexible than conventional inking rollers, which means that when using a standard inking roller with a uniform outer diameter, there is a change in the contact strip between the inking roller and the plate cylinder.
  • the inking roller F 1 , F 2 or F 3 can have a convex shape along its axial length, 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 21
  • the degree of the curvature, ie the shape of the curve, which forms the outer diameter of the outer layer 21, can, according to standard beam displacement algorithms or computer models, be dependent on the axial length, the diameter and the materials of the inking rollers F 1 , F 2 and F. 3 can be determined.
  • the inking roller with the hard outer layer 21 as the last inking roller in the direction of rotation of the plate cylinder P, i.e. in the position of the inking roller F 3 in FIG. 1, and the other two inking rollers with a usual hardness, e.g. B. in the range of 27-35 Shore A. Improved printing results can be achieved if each of the inking rollers F 1 , F 2 and F 3 has a hard outer layer 21.
  • inking roller cooling system (not shown) e.g. B. in the form of coolant channels in the cavity inside the inking rollers F 1 , F 2 or F 3 .

Landscapes

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

Claims (7)

  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), 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.
  2. Dispositif d'encrage selon la revendication 1, caractérisé en ce que la dureté de la couche extérieure (21) est à peu prés entre 60 Shore A et 90 Shore A et est en particulier de 80 Shore A.
  3. Dispositif d'encrage selon la revendication 1 ou 2, caractérisé en ce que la surface extérieure de la couche extérieure (21) présente une forme convexe selon la longueur axiale de la couche extérieure (21).
  4. Dispositif d'encrage selon une des revendications précédentes, caractérisé en ce que la couche extérieure (21) contient un élastomére, par exemple du caoutchouc.
  5. Dispositif d'encrage selon une des revendications 1 à 4, 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.
  6. Dispositif d'encrage selon une des revendications 1 à 4, 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.
  7. 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 true EP0985530B1 (fr) 2003-09-24
EP0985530B2 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 (6)

Country Link
US (1) US6098540A (fr)
EP (1) EP0985530B2 (fr)
JP (1) JP2000052625A (fr)
CN (1) CN1131780C (fr)
DE (2) DE19934395B4 (fr)
HK (1) HK1023095A1 (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
DE102006015482B4 (de) * 2006-04-03 2010-06-24 Koenig & Bauer Aktiengesellschaft Walze einer Druckmaschine
DE102006015490B4 (de) * 2006-04-03 2009-11-12 Koenig & Bauer Aktiengesellschaft Rollendruckmaschine mit einem Filmfarbwerk
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

Family Cites Families (15)

* Cited by examiner, † Cited by third party
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
DE8908243U1 (fr) * 1989-07-06 1989-08-17 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
EP0518892B1 (fr) † 1990-03-03 1994-06-22 Albert-Frankenthal AG Mecanisme d'encrage court pour rotative
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
DE9310713U1 (de) * 1993-07-17 1993-09-02 Roland Man Druckmasch Farbauftragwalze
DE4436973C2 (de) † 1993-12-21 2003-06-26 Heidelberger Druckmasch Ag Gummituch mit variierendem Profil und Verfahren zu seiner Herstellung
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 Roland Man Druckmasch Walze in einer Druckmaschine

Also Published As

Publication number Publication date
CN1244462A (zh) 2000-02-16
EP0985530A2 (fr) 2000-03-15
DE19934395A1 (de) 2000-02-17
HK1023095A1 (en) 2000-09-01
EP0985530A3 (fr) 2000-10-04
DE59907097D1 (de) 2003-10-30
US6098540A (en) 2000-08-08
DE19934395B4 (de) 2012-11-08
CN1131780C (zh) 2003-12-24
JP2000052625A (ja) 2000-02-22
EP0985530B2 (fr) 2009-01-14

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