EP1754606A2 - Schabervorrichtung für eine tinteneinheit eines flexodruckers - Google Patents

Schabervorrichtung für eine tinteneinheit eines flexodruckers Download PDF

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Publication number
EP1754606A2
EP1754606A2 EP05735725A EP05735725A EP1754606A2 EP 1754606 A2 EP1754606 A2 EP 1754606A2 EP 05735725 A EP05735725 A EP 05735725A EP 05735725 A EP05735725 A EP 05735725A EP 1754606 A2 EP1754606 A2 EP 1754606A2
Authority
EP
European Patent Office
Prior art keywords
ink
groove
ink roller
blades
roller
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.)
Withdrawn
Application number
EP05735725A
Other languages
English (en)
French (fr)
Inventor
Lluís ESPARCH MARTÍ
Jordi Puig Vila
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.)
Comexi SA
Original Assignee
Comexi SA
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 Comexi SA filed Critical Comexi SA
Publication of EP1754606A2 publication Critical patent/EP1754606A2/de
Withdrawn legal-status Critical Current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
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing

Definitions

  • the present invention generally relates to a doctor blade device for an ink unit of a flexographic printer and more specifically to a doctor blade device adapted to be located below a lower part of an ink roller and designed to act as a receptacle for gathering any excess ink or leaks from the ink applied to the ink roller.
  • Flexographic printer machines generally comprise a rotating support drum on which a material to be printed is supported and several printing groups arranged around the drum, provided for several colors to be printed.
  • Each printing group comprises a stencil-carrying printing roller with the patterns to be printed arranged to come into contact with the surface of the material to be printed on the support drum, an ink roller arranged to come into contact with the stencil on the printing roller and a doctor blade device arranged to apply ink to the surface of the ink roller.
  • the printing roller, the ink roller and the doctor blade device are assembled in the printer frame by means of mechanisms allowing regulation and separation movements for sleeve changes and maintenance tasks.
  • Document WO 96/34751 describes a doctor blade device for an ink mechanism of a printer of this type comprising a blade-holder body which defines a groove and which has two projecting blades fixed to the sides thereof such that the free edges thereof come into contact with a surface of an ink roller.
  • the device incorporates at least an inlet and an outlet connected to ink circulation means so that ink can be introduced into and released from an ink container or chamber that is defined by said groove, the blades, a part of the outer surface of the ink roller and sealing means arranged at the ends such that the ink circulating through the chamber is applied to the ink roller.
  • the surface of the ink roller also called “anilox roller”
  • anilox roller comprises microcells or honeycombs which must be filled with ink during the time in which they travel from one blade to another in contact with the ink in the doctor blade when the ink roller is turned. This time varies according to the turning speed of the ink roller, which is related to the printing speed. The higher the printing speed, the lesser the time in which a honeycomb will be in contact with the ink.
  • the blades are normally separated as much as possible and/or the pressure and flow conditions of the ink circulation are increased in order to allow higher printing speeds.
  • the former has limits imposed by the geometry of the machine and the latter demands greater tightness measures and may cause ink losses or leaks.
  • Each of the two blades is secured at one of its edges to the blade-holder body and has a projecting portion extending towards the other blade away from the blade-holder body.
  • the blades and their imaginary extensions have the shape of a roof over the groove of the blade-holder body.
  • the blades come into contact with the ink roller on the side thereof that is diametrically opposite to the line of contact between the ink roller and the printing roller, which means that the body of the doctor blade is in a substantially vertical position, with a blade in the upper part and another in the lower part.
  • the inlet is generally arranged in the lower part of the body of the doctor blade and the outlet in the upper part.
  • the blades are strips coming into contact with the surface of the ink roller preferably forming an angle of 30° to 35° with a plane tangent to the surface of the ink roller in the line of mutual contact.
  • the other blade works in favor of the turning direction of the roller and its main function is to cooperate in closing the chamber at the lower part, while it allows the excess ink on the ink roller, i.e. the ink which has not been transferred from the ink roller to the printing roller, to return to the inside of the chamber.
  • the sealing means comprise parts of elastic material, such as polymer foam, rubber, nylon or felt, radially attacking against the ends of the ink roller. Given that the blades experience wearing, a mechanism moves the doctor blade assembly forward as the blades wear down and the sealing elastic parts are compressed while maintaining their tightness.
  • elastic material such as polymer foam, rubber, nylon or felt
  • the tightness of the chamber in this type of doctor blade device can have several problems.
  • the sealing elastic parts it is usual for the sealing elastic parts to not adjust well, thus causing leaks or drips in the sides of the body of the doctor blade and leaving ink in the ends of the ink roller that may cause splashes towards the operators and/or towards the material which is being printed.
  • the lower or "positive" strip does not allow the re-entrance of excess ink to the chamber, and that this ink falls along the doctor blade due to gravity.
  • the turning direction of the ink roller is reversed, and the positive blade is in the upper part. In this case, the excess ink that cannot return to the chamber accumulates forming a strand of ink along the blade which runs until it drips from the ends of the body of the doctor blade.
  • the present invention contributes to solving the previous drawbacks by supplying a doctor blade device for an ink unit of a flexographic machine, of the type comprising a blade-holder body which defines a groove and which has two projecting blades fixed to the sides thereof such that the free edges thereof come into contact with a surface of the ink roller.
  • the device further incorporates at least an inlet and an outlet connected to ink circulation means so that ink can be introduced into and released from an ink container that is at least partially defined by said groove in order to apply said ink to said ink roller.
  • the device of the present invention is characterized in that said blade-holder body is positioned below a lower part of the ink roller and in that said two blades are inclined in relation to the horizontal and in the direction of the groove which serves as a receptacle for gathering any excess ink or leaks from the ink applied to the ink roller.
  • the part of the surface of the ink roller extending between the lines of contact with the two blades and which is opposite to the groove preferably includes a sector ⁇ representing 70° to 110° of the circumference of the surface of the ink roller, while each of the two blades forms an angle ⁇ of 20° to 40° with a plane tangent to the surface of the ink roller in the line of mutual contact.
  • This geometric arrangement provides a greater relative separation between the two blades, which means a greater time of contact of the surface of the ink roller with the ink in the container, greater printing speeds being admissible.
  • the side sealing of the blade-holder body is not essential.
  • the bottom of the groove is preferably concave and said inlet and said outlet have openings located in positions such that they ensure a suitable ink level in said ink container so that at least one portion of the ink roller is submersed for the purpose of wetting its surface.
  • the container can be open to the atmosphere and, if necessary, small screens could be arranged at the ends of the device to prevent splashes.
  • the two blades are inclined towards the groove, i.e., their respective free edges are located at a lower level than their edges secured to the blade-holder body, the drip due to gravity of the excess ink along the "positive" blade is prevented, and the drip of the possible strand of ink at the ends of the blades is gathered by the groove itself.
  • the groove and the two blades are arranged symmetrically with respect to a central vertical plane of the ink roller, such that the two blades are operative in the two directions of the ink roller, acting without distinction as "positive” blade and "negative” blade.
  • the device according to the present invention can also incorporate sealing means at the ends of the groove to hermetically seal the ink container forming a chamber defined, in a manner similar to the manner known in the state of the art, by the groove, the two blades, a part corresponding to the surface of the ink roller, and said sealing means.
  • the ink container or chamber preferably comprises an ink entrance area communicated with said inlet and an ink exit area connected to said outlet, said ink entrance and exit areas being communicated through a narrowing defined by an area of maximum proximity between the bottom of the groove and the surface of the ink roller. This causes a pressure increase of the ink in the chamber entrance area favoring the filling of the honeycombs.
  • sealing elastic elements can be arranged to come into dynamic contact in a radial direction against the sectioned cylindrical surface, as in the devices of the state of the art.
  • the sealing means can advantageously comprise elastic elements arranged in dynamic contact with surfaces at the ends of the ink roller different from said sectioned cylindrical surface, either in a radial contact direction, for example on a cylindrical surface at a small distance from the sectioned surface, or an axial contact direction.
  • FIGS. 1 and 2 show the doctor blade device integrated in an ink unit of a flexographic machine further comprising an ink roller 5 and a stencil-carrying printing roller shown with dashed lines.
  • the reference numbers 19a and 19b designate printing rollers with the maximum diameter admissible and the minimum diameter admissible respectively.
  • the device comprises a blade-holder body 1 defining a groove 2 in its middle part. There are two projecting blades 3, 4 fixed to the sides of said groove 2, which blades are arranged to come into contact with their free edges against a surface of an ink roller 5.
  • the blade-holder body 1 is positioned below a lower part of said ink roller 5 and said two blades 3, 4 are inclined in relation to the horizontal and in the direction of said groove 2.
  • the blades 3, 4 have respective free edges located at a lower level than other opposite edges secured to the blade-holder body 1, in contrast to the roof shape of the devices of the state of the art.
  • the blade-holder body 1 there are incorporated at least an inlet 7 and an outlet 8 communicating with the groove 2 and which are adapted to be connected by ink circulation means so that ink can be introduced into and released from an ink container 6 that is at least partially defined delimited by the groove 2 in order to apply said ink to said ink roller 5.
  • the groove 2 acts as a receptacle for gathering any excess ink or leaks from the ink applied to the ink roller 5.
  • the separation between the two blades 3, 4 is greater than normal in the devices of the state of the art.
  • the part of the sectioned cylindrical surface of the ink roller 5 extending between the lines of contact with the two blades 3, 4, and opposite to the groove 2 includes a sector ⁇ representing 70° to 110° of the circumference of the ink roller 5. Thanks to this, the two blades 3, 4 are inclined in the direction of the groove 2 despite the fact that each one forms, as is usual in the devices of the state of the art, an angle of 20° to 40° with a plane tangent to the surface of the ink roller 5 in the line of mutual contact, considered to be optimal for the good performance of the doctor blades.
  • Figure 2 shows how, according to this embodiment, the groove 2 is longer than the sectioned surface of the ink roller 5, and walls 9, 10 located at the ends of the groove 2 define said ink container 6. Furthermore, the bottom of the groove 2 is concave (see Figure 1 again) and in it there are openings of said inlet 7 and of said outlet 8, which are located in positions such that they ensure a suitable ink level L in said container 6 so that at least one portion of the sectioned surface of the ink roller 5 is submersed for the purpose of wetting its surface.
  • the device comprises sealing means 11, 12 located at the ends of the groove 2 groove to hermetically seal said ink container 6.
  • the mentioned sealing means 11, 12 comprise elements of elastic material, such as polymer foam, arranged radially and in dynamic contact with the ends of the sectioned cylindrical surface of the ink roller 5.
  • the elastic elements 11, 12 are fixed to the blade-holder body 1 by means of outer covers 13, 14.
  • the container adopts the shape of a closed chamber defined delimited by the groove 2, the two blades 3, 4, a corresponding part of the surface of the ink roller 5, and said sealing means 11, 12.
  • the sealing means 11, 12 comprise elastic elements arranged radially and in dynamic contact with cylindrical surfaces 15, located at the ends of the ink roller 5, different from the sectioned cylindrical surface. This provides a better tightness contact and reduces the wearing of the elastic elements 11, 12 because there are no honeycombs in the cylindrical surfaces 15.
  • the elastic elements 11, 12 are also fixed here to the blade-holder body 1 by means of outer covers 13, 14, and the container forms a chamber defined by the groove 2, the two blades 3, 4, a corresponding part of the surface of the ink roller 5, and said sealing means 11, 12.
  • the sealing means 11, 12 comprise elastic elements arranged axially and in dynamic contact with annular surfaces 16, located at the ends of the ink roller 5, different from the sectioned cylindrical surface.
  • the elastic elements 11, 12 are assembled in outer covers 17, 18 fixed to the blade-holder body 1.
  • the container forms a chamber defined by the groove 2, the two blades 3, 4, a corresponding part of the surface of the ink roller 5, and said sealing means 11, 12.
  • the ink container 6 preferably ( Figure 1) comprises an ink entrance area 6a communicated with said inlet 7 and an ink exit area 6b communicated with said outlet 8. Both ink entrance and exit areas 6a, 6b are communicated with each other through a narrowing 6c defined by an area of maximum proximity between the bottom of the groove 2 and the surface of the ink roller 5. This causes a pressure increase in the ink entrance area 6a chamber favoring the entrance of ink into the honeycombs.
  • Figure 1 shows another advantageous feature of the device of the present invention.
  • the groove 2 and the two blades 3, 4 are arranged symmetrically with respect to a central vertical plane of the ink roller 5.
  • the two blades 3, 4 are operative to work in both turning directions of the ink roller 5, it only being necessary to reverse the inlet and outlet.
  • this symmetry is not essential and according to another embodiment which is not shown, the groove 2 and the two blades 3, 4 are arranged asymmetrically with respect to a central vertical plane of the ink roller 5, and in this case, the two blades 3, 4 are adapted to be operative for a single turning direction of the ink roller 5.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP05735725A 2004-04-20 2005-04-14 Schabervorrichtung für eine tinteneinheit eines flexodruckers Withdrawn EP1754606A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200400954A ES2216725B1 (es) 2004-04-20 2004-04-20 Dispositivo de rasqueta para un grupo entintador de una impresora flexografica.
PCT/ES2005/000196 WO2005101952A2 (es) 2004-04-20 2005-04-14 Dispositivo de rasqueta para un grupo entintador de una impresora flexográfica

Publications (1)

Publication Number Publication Date
EP1754606A2 true EP1754606A2 (de) 2007-02-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05735725A Withdrawn EP1754606A2 (de) 2004-04-20 2005-04-14 Schabervorrichtung für eine tinteneinheit eines flexodruckers

Country Status (3)

Country Link
EP (1) EP1754606A2 (de)
ES (1) ES2216725B1 (de)
WO (1) WO2005101952A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2264643B1 (es) * 2005-06-22 2007-10-01 Comexi, S.A. Dipositivo y metodo de impresion usando tintas curables por energia para impresora flexografica.
ES2319952B1 (es) 2008-09-29 2010-07-13 Neopack, S.L. Maquina impresora y grupo impresor para offset de formato variable.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1095296B (de) * 1959-01-28 1960-12-22 Goebel Gmbh Maschf Farbwerk fuer Rotationstiefdruckmaschinen
DE3539759C1 (de) * 1985-11-09 1987-04-02 Roland Man Druckmasch Farbteiler fuer ein Flexo-Farbwerk
US5085144A (en) * 1990-05-03 1992-02-04 Motter Printing Press Co. Ink fountain apparatus
US5150651A (en) * 1991-06-10 1992-09-29 Flores Carlos R Doctor-blade assembly for flexographic press
DE19516223C2 (de) * 1995-05-03 1997-03-20 Windmoeller & Hoelscher Rakelvorrichtung für ein Spülfarbwerk einer Rotationsdruckmaschine
NL1006861C2 (nl) * 1997-08-27 1999-03-02 Cornelis Gorter Kamerrakelsysteem.
DE59800788D1 (de) * 1998-01-28 2001-07-05 Fischer & Krecke Gmbh & Co Dichtung für Kammerrakel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005101952A3 *

Also Published As

Publication number Publication date
WO2005101952A3 (es) 2005-12-01
WO2005101952A2 (es) 2005-11-03
ES2216725B1 (es) 2006-01-16
ES2216725A1 (es) 2004-10-16

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