EP2252460B1 - Racle de compartiment a encre d'une machine d'impression - Google Patents

Racle de compartiment a encre d'une machine d'impression Download PDF

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Publication number
EP2252460B1
EP2252460B1 EP09719671A EP09719671A EP2252460B1 EP 2252460 B1 EP2252460 B1 EP 2252460B1 EP 09719671 A EP09719671 A EP 09719671A EP 09719671 A EP09719671 A EP 09719671A EP 2252460 B1 EP2252460 B1 EP 2252460B1
Authority
EP
European Patent Office
Prior art keywords
chamber
ink transfer
ink
inking
doctor blade
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.)
Active
Application number
EP09719671A
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German (de)
English (en)
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EP2252460A1 (fr
Inventor
Frank Hasselmann
Frank Gunschera
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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Publication of EP2252460A1 publication Critical patent/EP2252460A1/fr
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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
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the invention relates to a paint chamber doctor blade according to the preamble of claim 1.
  • ink By means of such ink chamber doctor blade ink transfer rollers, such as anilox rollers in flexographic printing or forme cylinder in gravure printing, ink is provided.
  • the ink transfer rollers have small depressions that are filled with ink.
  • the ink is delivered to other ink transfer rollers or the substrate.
  • the now emptied depressions, which are called in anilox rollers in the rest of the wells, can be filled in the next cycle within the ink chamber doctor blade with fresh ink.
  • the ink chamber doctor comprises a doctor chamber body which, when set to the ink transfer roller, extends along the axial direction of the ink transfer roller. At least two doctor blades are fastened to the doctor chamber body in a manner not described here in detail.
  • the doctor blades which can be distinguished in work doctor blade and squeegee, are in contact with the surface of the ink transfer roller and close, seen in the circumferential direction of the ink transfer roller, the interior of the ink chamber blade against the environment. So that the interior of the ink chamber doctor blade is also closed off at the front against the environment, walls are provided there. To the tightness of these frontally arranged Walls are generally arranged from the interior of the groove-like depression seals on the walls, which are also in contact with the ink transfer roller with their narrow sides.
  • the patent EP 0 822 897 B1 shows such a Farbhuntrakel.
  • the special feature of a disclosed in said document Farbhuntrakel are the so-called throttle gaps, which serve the purpose explained below.
  • the ink In order to fill the wells again with ink, the ink must be provided with a certain overpressure in the ink chamber doctor blade.
  • the evacuated depressions carry air into the doctoring chamber, which must be removed. Therefore, a Farbhuntrakel next to a Farbzu Switzerland must also have one or more Farbab constitutionalö réelleen and / or vent holes.
  • partitions dividers which divides the groove-like recess of the ink chamber blade into a main room and one or more secondary chambers.
  • the partitions form with the ink transfer rollers throttle gaps, so that in the side rooms there is a reduced pressure compared to the main room. It is advantageous if the Farbab technologicalö réelleen and / or the vent holes in the doctor blade chamber body are arranged in the region of these secondary chambers.
  • the ink feed opening is advantageously guided in the main room.
  • the object of the present invention is therefore to propose an improved ink chamber doctor blade, with which even at elevated printing speeds, the recesses of ink transfer rollers can be completely filled with fresh ink.
  • At least one opening is introduced into at least one separating device.
  • the air, with which the fresh ink is enriched can escape through the intermediate wall, without having to pass through a throttle gap. It can now be discharged a larger volume of air per unit time. The air thus passes into a secondary chamber where, if a vent hole is present, it can escape through it.
  • the air can be removed in other suitable ways.
  • This invention is based on the finding that, at least at higher peripheral speeds of the ink transfer rollers, a vortex forms within the ink chamber doctor blade.
  • This vortex receives at least part of its kinetic energy from the ink transfer roller.
  • the vortex acts as a cyclone (centrifugal separator), with a centrifugal force acting on the heavier elements, which drives them outwards. Accordingly, the air gathers more in the interior of the vortex, ie in the vortex center, where it forms an air column. This results in a separation of the air from the ink.
  • Such a vortex is trying according to its axis of rotation parallel to the axis of the ink transfer roller.
  • the at least one opening is circular.
  • the vortex which forms within the ink chamber doctor blade, also usually has a circular shape.
  • the central air trapping follows this shape, so that with a circular opening of the air offers a suitable outlet for escape outlet.
  • a piece of pipe or a piece of hose may be passed through the opening, whereby it is possible to remove the air from further central areas of the ink chamber doctor blade.
  • the pipe section or the hose piece extends into the at least one secondary chamber and is bent or angled there.
  • the air that is removed from the vortex can be directed in a desired direction, for example in the direction of the vent hole.
  • the pipe section or the hose piece can also connect the opening with the surroundings of the ink chamber doctor blade, that is, be guided through the vent hole. On further vent holes that lead out of the secondary chambers to the outside, can then be dispensed with.
  • a profile body is provided in the interior of the ink chamber doctor blade.
  • This profile body can be formed integrally with the doctor chamber body.
  • this profile body can be used in the groove-like recess body. This is particularly useful when cost ink jet doctor blade to be produced with differently shaped profile bodies.
  • the profile body has a special shape, which is described below and explained in more detail.
  • the profile body Seen in the circumferential direction of the ink transfer roller, the profile body has an increase. In the region of this increase, the distance between the profile body and the peripheral surface of the ink transfer roller is small, so that a bottleneck arises. However, the profile body does not abut the ink transfer roller. With the bottleneck, it is possible to specifically influence the flow direction and also the flow velocity of the printing ink or the ink-air mixture. Experiments have shown that in many cases behind this bottleneck forms the vortex described above. As a result, air and ink can be reliably separated.
  • the elevation is designed as an edge. From a mathematical point of view, it can be said that, seen in the cross section of the profile body, the line on the increase continues unsteadily.
  • the extension behind the edge causes the printing ink, which is already in this area of the chamber, to be entrained by the ink adhering to the ink transfer roller, so that the named vortex forms stationary.
  • the increase in the direction of rotation of the ink transfer roller seen behind the center plane of the ink chamber doctor blade is also arranged orthogonal to the back of the ink chamber doctor blade.
  • the profile body advantageously has a specially designed cross-section.
  • “Steady” is to be understood in the mathematical sense, that is, that no kinks or edges are present in the profile.
  • the tangential surface is orthogonal to the median plane of the doctor chamber. Also, according to the invention, the distance should be steadily smaller.
  • the openings of the intermediate walls, as seen in the direction of rotation of the ink transfer roller, also lie behind the elevation. If the vortex center is formed at this point, it is also necessary to provide the openings in this area as well.
  • the Figures 1 and 2 show two views of a Farbhuntrakel 1 and a Farbübertragungswalze 2.
  • the ink transfer roller 2 is formed in a manner not shown as an anilox roller.
  • the ink chamber doctor blade 1 comprises a chambered doctor blade body 3, which of course may consist of several parts. Like from the FIG. 2 it can be seen, the chambered doctor blade body 3 comprises a flat bottom 4 and two side surfaces 5, which adjoin the flat bottom 4 at an angle.
  • the ink transfer roller 2 facing sides of the chambered doctor blade body 3 comprise two inclined surfaces 6, which define a groove-like recess 7 between them. Components of the inclined surfaces 6 are the bearing surfaces for the doctor blade 9.
  • doctor blades 9 are employed on the ink transfer roller 2, so that the interior, which through the recess 7, the ink transfer roller 2, the doctor blade 9 and by the in Fig. 3 shown frontal seals 8, which also rest against the ink transfer roller 2 is limited, can be filled with paint, without this penetrates to the outside.
  • the doctoring chamber body 3 extends like the FIG. 1 can be removed, parallel to the axis of rotation 10 of the ink transfer roller 2. This parallel direction is also referred to as the axial direction.
  • clamping rails 11 are provided, which are acted upon by forces whose resultant in the direction of the chambered doctor blade body 3.
  • One of these forces, with which the clamping rail 11 is acted upon, is based on the screws 12, which pass through introduced into the clamping rail 11 holes, preferably slots, and are bolted to the chambered doctor blade body 3. Bottoms of the screw heads extend beyond the edge of the holes, so that when the clamping rail 11 is acted upon by the continuous shaft 13 with a force which points away from the chamber doctor blade body 3, can not be further removed from the chamber doctor blade body 3.
  • the clamping rail acts like a lever, the force of which is used to fix the doctor blade.
  • the upper clamping rail 11 in FIG. 2 is shown in the released position. In this case, the doctor blade can be removed, for example by pulling in the axial direction.
  • the lower clamping rail 11 is shown in the fixing position in which the clamping rail presses the doctor blade 9 on the inclined surface 6.
  • the wave, as in the FIG. 2 is visible, eccentrically shaped, so that by rotation of the shaft 13, the distance of the clamping rail 11 to the chambered doctor blade body 3 and thus the fixing force can be changed.
  • the waves 13 can not escape when the clamping rails 11 are fixed, the shafts 13 are inserted into shell-like grooves 14.
  • the Fig. 3 1 shows a view of the lateral boundaries 15, which are acted upon on their insides with seals 8, which in turn seal the groove-like depression to the outside, so that no ink can escape laterally.
  • the gutter-like depression is divided by means of intermediate walls 16 into a plurality of sub-chambers.
  • an intermediate wall 16 divides a secondary chamber 17 from the main chamber 18.
  • the secondary chambers 17 are arranged in the end regions of the ink chamber doctor blade 1.
  • the advantage of this separation has already been explained in detail in this document and is also the aforementioned EP 0 822 897 B1 refer to. But it can also be provided more intermediate walls 16, so that a plurality of secondary chambers arise. Each intermediate wall 16 then ensures a pressure drop.
  • the main chamber 18 is provided with a supply port 23 which serves to supply ink. It can also be provided several feed openings.
  • These openings 19 can, as in the Fig. 2 is visible, be circular.
  • small tubes 22 may be additionally attached, with which the direction of the air flow can be influenced.
  • Such a tube is in the Fig. 3 drawn for the left partition 16. This tube 22 may, as shown, be bent in its end region, so that the air is directed in the direction of the vent opening 21.
  • the right partition 16 shows the embodiment without an additional tube.
  • the chambered doctor blade body 3 also comprises a recess 25 in the groove-like depression 7 into which a profile body 24 can be inserted.
  • This profile body 24 can be secured in a suitable manner, for example by screwing, in the chambered doctor blade body 3 and also released again.
  • a Farbschrakel 1 of the invention for different requirements, for example, different printing speeds can be modified.
  • the entry of air is rather low, so that usually no problems in filling the wells of the ink transfer roller 2 comes. In this case, therefore, the flow of color in the ink chamber doctor blade 1 must not be affected, so that can be dispensed with a profile body.
  • the color transfer roller 2 facing surface 26 of the profile body 24 has seen in cross section a special contour.
  • this contour has a substantially increasing profile in the direction of rotation R of the ink transfer roller 2, which culminates in an edge 27.
  • a steeply sloping profile is provided.
  • the described profile compresses the air / ink mixture entrained by the ink transfer roller so that its pressure increases. This pressure increase continues up to the edge 27.
  • the highly pressurized mixture is entrained by the ink transfer roller 2 and only peeled off from the surface of the ink transfer roller 9 by the doctor blade 9.
  • the resulting vortex is characterized by the formation of an air column in its center.
  • the edge 27 may be advantageous to arrange the edge 27 so that it lies in the direction R behind a surface 28 which is arranged orthogonal to the bottom 4 of the ink chamber doctor blade and divides the ink chamber doctor blade into an upper and a lower half.
  • a surface 28 which is arranged orthogonal to the bottom 4 of the ink chamber doctor blade and divides the ink chamber doctor blade into an upper and a lower half.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (9)

  1. Racle de compartiment à encre (1) pour une machine à imprimer rotative pour l'application à un rouleau de transfert d'encre (2) d'une machine à imprimer rotative, où la racle de compartiment à encre (1) comprend au moins les caractéristiques suivantes:
    - un corps de compartiment de racle (3) qui, lors de l'application au rouleau de transfert d'encre (2), s'étend dans la direction axiale de celui-ci et qui comprend au moins un évidement en forme de rainure (7), s'étendant dans la direction d'extension,
    - au moins deux lames de racle (9) disposées en forme de toit, qui peuvent être appliquées au moins avec leurs arêtes au rouleau de transfert d'encre,
    - des parois (15) au côté frontal qui séparent au moins un évidement en forme de rainure précité latéralement de l'environnement,
    - au moins une installation de séparation (16) dans l'évidement en forme de rainure, qui sépare l'évidement en forme de rainure en une chambre principale (18) et une ou plusieurs chambres secondaires (17), caractérisée en ce qu'il est ménagé dans au moins une installation de séparation précitée (16) au moins une ouverture (19).
  2. Racle de compartiment à encre (1) selon la revendication 1, caractérisée en ce qu'au moins une ouverture précitée (19) est circulaire.
  3. Racle de compartiment à encre (1) selon l'une des deux revendications précédentes, caractérisée en ce qu'une pièce de tube ou de tuyau (22) peut être guidée à travers l'ouverture (19).
  4. Racle de compartiment à encre (1) selon la revendication précédente, caractérisée en ce que la pièce de tube ou de tuyau (22) fait saillie dans au moins une chambre secondaire (17) et y est courbée ou coudée.
  5. Racle de compartiment à encre (1) selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu dans la chambre principale (18) un corps profilé (24) qui s'étend dans la direction de l'évidement en forme de rainure (7) et qui, vu dans la direction périphérique (R) du rouleau de transfert d'encre (2), présente une surélévation (27) qui forme avec le rouleau de transfert d'encre (2) un passage étroit.
  6. Racle de compartiment à encre (1) selon la revendication précédente, caractérisée en ce que la surélévation est réalisée en tant qu'arête (27).
  7. Racle de compartiment à encre (1) selon l'une des deux revendications précédentes, caractérisée en ce que la surélévation (27), vue dans la direction de rotation (R) du rouleau de transfert d'encre (2), se situe derrière le plan médian (28) de la racle de compartiment à encre (1).
  8. Racle de compartiment à encre (1) selon l'une des trois revendications précédentes, caractérisée en ce que le corps profilé (24) présente un profil dans lequel l'écart au rouleau de transfert d'encre vu dans la direction de rotation (R) du rouleau de transfert d'encre (2), diminue d'abord constamment en amont de la surélévation (27) et augmente à nouveau constamment en aval de la surélévation (27).
  9. Racle de compartiment à encre (1) selon l'une des quatre revendications précédentes, caractérisée en ce que les ouvertures (19) des installations de séparation (16), vues dans la direction de rotation (R) du rouleau de transfert d'encre (2), se situent derrière la surélévation (27) du corps profilé (24).
EP09719671A 2008-03-04 2009-02-23 Racle de compartiment a encre d'une machine d'impression Active EP2252460B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008012552A DE102008012552A1 (de) 2008-03-04 2008-03-04 Farbkammerrakel an einer Druckmaschine
PCT/EP2009/052119 WO2009112353A1 (fr) 2008-03-04 2009-02-23 Raclette pour compartiment de couleur au niveau d'une machine d'impression

Publications (2)

Publication Number Publication Date
EP2252460A1 EP2252460A1 (fr) 2010-11-24
EP2252460B1 true EP2252460B1 (fr) 2011-08-10

Family

ID=40809862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09719671A Active EP2252460B1 (fr) 2008-03-04 2009-02-23 Racle de compartiment a encre d'une machine d'impression

Country Status (6)

Country Link
US (1) US20100319558A1 (fr)
EP (1) EP2252460B1 (fr)
AT (1) ATE519596T1 (fr)
DE (1) DE102008012552A1 (fr)
ES (1) ES2367955T3 (fr)
WO (1) WO2009112353A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112013032533A2 (pt) * 2011-11-03 2017-03-01 Tetra Laval Holding & Finance S A aparelho para impressão flexográfica
ES2721054T3 (es) * 2016-01-14 2019-07-26 Windmoeller & Hoelscher Elemento de sellado para el sellado frontal de una cámara de rasqueta

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581995A (en) * 1985-06-07 1986-04-15 Motter Printing Press Co. Ink sealing assembly
DK49188D0 (da) * 1988-02-01 1988-02-01 Tresu As Rakel
WO1993010976A1 (fr) * 1991-11-26 1993-06-10 Cornelis Gorter Racle du reservoir d'encre d'un element destine au transfert d'encre
US5243907A (en) * 1992-01-22 1993-09-14 The Langston Corporation Divider seal for split-fountain chambered doctor blade for a flexographic printing press
DE19516223C2 (de) 1995-05-03 1997-03-20 Windmoeller & Hoelscher Rakelvorrichtung für ein Spülfarbwerk einer Rotationsdruckmaschine
DE19536268C1 (de) * 1995-09-28 1997-02-06 Windmoeller & Hoelscher Rakelvorrichtung für ein Spülfarbwerk einer Rotationsdruckmaschine
US5826509A (en) * 1995-10-18 1998-10-27 Deneka; P. Kenneth Printing coating head device
DE19631301A1 (de) * 1996-08-02 1998-02-05 Gorter Cornelis Farbkammerrakel für eine Druckmaschine
DE19949103A1 (de) * 1999-10-12 2001-05-10 Kroenert Max Maschf Dichtungsanordnung für eine Druckkammerrakel
DE10164773A1 (de) * 2001-09-03 2003-07-17 Kroenert Max Maschf Druckkammerrakel
DE10150488B4 (de) * 2001-10-16 2005-08-04 Windmöller & Hölscher Kg Stirnseitige Abdichtung der Rakelkammer
DE102006029883A1 (de) * 2006-06-28 2008-01-03 Koenig & Bauer Aktiengesellschaft Vorrichtung zum Einfärben einer Walze an einer Rotationsdruckmaschine

Also Published As

Publication number Publication date
ES2367955T3 (es) 2011-11-11
EP2252460A1 (fr) 2010-11-24
ATE519596T1 (de) 2011-08-15
WO2009112353A1 (fr) 2009-09-17
US20100319558A1 (en) 2010-12-23
DE102008012552A1 (de) 2009-09-17

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