EP2678161A1 - Dispositif d'impression en héliogravure - Google Patents

Dispositif d'impression en héliogravure

Info

Publication number
EP2678161A1
EP2678161A1 EP12749625.5A EP12749625A EP2678161A1 EP 2678161 A1 EP2678161 A1 EP 2678161A1 EP 12749625 A EP12749625 A EP 12749625A EP 2678161 A1 EP2678161 A1 EP 2678161A1
Authority
EP
European Patent Office
Prior art keywords
ink
cell
rotogravure printing
printing device
cells
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.)
Granted
Application number
EP12749625.5A
Other languages
German (de)
English (en)
Other versions
EP2678161B1 (fr
EP2678161A4 (fr
Inventor
Frank W. ACAMPO
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.)
Stora Enso Oyj
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Publication of EP2678161A1 publication Critical patent/EP2678161A1/fr
Publication of EP2678161A4 publication Critical patent/EP2678161A4/fr
Application granted granted Critical
Publication of EP2678161B1 publication Critical patent/EP2678161B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/11—Gravure cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/18—Impression cylinders
    • B41F13/187—Impression cylinders for rotogravure
    • 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
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/06—Printing plates or foils; Materials therefor metallic for relief printing or intaglio printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/42—Printing without contact between forme and surface to be printed, e.g. by using electrostatic fields

Definitions

  • the present invention relates to a rotogravure printing device for electrostatically assisted printing, said device comprising a surface arranged with numerous ink cells, each having a wall portion and a bottom portion.
  • the present invention relates to rotogravure printing having an electrostatic assist.
  • Rotogravure printing is one of the conventional methods of printing on a sheet, web or other substrate. This printing is capable of reproducing both subtle shades of colour and black and white, and is particularly well suited for printing great numbers of copies precisely and rapidly.
  • Rotogravure printing is a commercial printing process which can control both the ink film thickness and the area of coverage. This is achieved by the engraving of recessed microscopic wells, frequently referred to as cells of varying depth and area in the printing medium or image carrier surface, usually a gravure cylinder.
  • the amount of ink available for placement on the substrate is governed to generate an image composed of an arrangement of large and small dots and is controlled by the size and depth of the cells.
  • the gravure cylinder is mounted for rotation about a horizontal axis, and supplied with a liquid ink of high fluidity.
  • a doctor blade removes ink from such portions of its peripheral surface as do not contain the cells, these cells contain ink until it is deposited upon the surface of the substrate. This is accomplished by passing the substrate between the gravure cylinder and an impression cylinder having a resilient covering which presses the lower surface of the substrate against the gravure cylinder so that ink in the cells may be deposited upon that surface.
  • the ink is not always fully deposited from all of the cells and these incomplete or even missing dots caused by this result in faulty prints.
  • ESA Electrostatic Assist
  • a lifting force acts on the ink even in the middle of the cell which yields a more even print out, a better tone value and a reduction of ink consumption.
  • the bottom of the ink cells has at least one protruding part that acts as an attractor for field lines and as a consequence a lifting force acts on the ink also in the middle and the ink is lifted more uniformly out of the cell and the resulting print dots are full dots without a hole in the middle.
  • the wall portion of the ink cell extends substantially vertically.
  • the protruding part has a height that is equal to or smaller than the height of the wall portions.
  • the base width of the protruding part is at least one fourth the size of the width of the cell so no areas with sparse field lines occurs.
  • Fig. 1 A) and B) shows the sequential process of ink transfer of prior art rotogravure printing
  • Fig. 2 is a cross sectional view of a laser etched U-shaped ink cell 1 of a prior art kind, as that used in fig. 1 B
  • Fig. 3 is a cross sectional view of a mechanically engraved V-shaped ink cell of a prior art kind, as that used in fig. 1 A
  • Fig. 2 is a cross sectional view of a laser etched U-shaped ink cell 1 of a prior art kind, as that used in fig. 1 B
  • Fig. 3 is a cross sectional view of a mechanically engraved V-shaped ink cell of a prior art kind, as that used in fig. 1 A
  • Fig. 4 shows a view from above of a section of a gravure device arranged with ink cells according to the invention
  • Fig. 5 shows a cross sectional view, along C - C in fig. 4, of an ink cell according to the invention
  • Fig. 6 shows a view from above of a section of a gravure device arranged with alternative ink cells according to the invention
  • Fig. 7 is a cross sectional view, along D - D in fig. 6, of an alternative ink cell according to the invention
  • Fig. 8 is a cross sectional view of still an alternative embodiment of an ink cell according to the invention
  • Fig. 9 is a cross sectional view of yet an alternative embodiment of an ink cell according to the invention.
  • Fig. 1 A) and B) shows the sequential process of ink transfer of prior art electrostatically assisted rotogravure printing, obtained by means of a gravure cylinder 4 having numerous recessed microscopic wells 2 (fig A) and 1 (Fig B) , so called cells.
  • the amount of ink available for placement on a substrate is controlled by the size and depth of the cells 1,2.
  • the gravure cylinder 4 is mounted for rotation about a horizontal axis and supplied with ink of high fluidity.
  • a doctor blade removes ink from such portions of its peripheral surface as do not contain the cells, these cells contain ink 5 until it is deposited upon the surface of a substrate. This is accomplished by passing the substrate between the gravure cylinder 4 and an impression cylinder (not shown) having a resilient covering which presses the lower surface of the substrate against the gravure cylinder 4 so that ink 5 in the cells 1,2 may be deposited upon that surface.
  • the transfer of ink 5 from gravure cells 1,2 to the substrate is enhanced by the application of an electric field between the gravure and impression cylinder passing through the ink 5, due to dielectrophoresis.
  • Fig 1 there is shown sequentially the process of transfer of the ink 5, by means of in the lower most part a) showing it before nip contact, in an intermediate part b) showing the phase of ink lifting and in uppermost part c) the nip contact area.
  • a doughnut shaped ink lifting is obtained, causing not all of the ink 5 to deposit from all of the cells 1,2, resulting in incomplete dots leading to reduced quality and sometimes therefore faulty prints.
  • Fig. 2 is a cross sectional view of a laser etched U-shaped ink cell 1 of a prior art kind, as that used in fig. 1 B.
  • These cells 1 are in the form of circular engravings, having substantially vertical edges 11,12 and a substantially horizontal bottom 14.
  • the concentration of field lines 10 is larger at the cell's 1 edges 11,12 than at the centre 13 of the cell 1. The consequence of this is that no lifting force acts on the ink in the centre 13 of the ink cell 1 and the result is a doughnut shaped ink lifting as can be seen in figure 1 B.
  • Fig. 3 is a cross sectional view of a mechanically engraved V-shaped ink cell 2 of a prior art kind, as that used in fig. 1 A.
  • the volume of the cell 2 forms an upside-down pyramid with four faces; seen from above, the cell 2 look like a rhomb.
  • the cell 2 has inclined edges 21,22 that meet at a centre 23 of the cell 2.
  • the concentration of field lines 10 is larger at the cell's 2 edges 21,22 than at the centre 23 of the cell 2. The consequence of this is that no lifting force acts on the ink in the centre 23 of the ink cell 2 and the result is a doughnut shaped ink lifting as can be seen in figure 1 A.
  • the shape of the ink cell 1,2 influences the effectiveness of ink transfer.
  • the ink lifting from an ink cell with U-shape 1 happens faster than from an ink cell with V-shape 2 (mechanically engraved).
  • the field lines 10,20 as indicated in figures 2 and 3 the concentration of field lines 10 at the edges 11,12 of a U-shaped ink cell 1 is larger than in the case of a V-shaped ink cell 2.
  • the field lines 10,20 are sparse at the centre 13,23 of the ink cell 1,2. As consequence no lifting force acts on the ink in the centre of the ink cell 1,2 and the result is a doughnut shaped ink lifting, as can be seen in figures 1 A) and B).
  • Fig. 4 shows a view from above of a section of a gravure device 4, e.g. a gravure cylinder, arranged with ink cells 3 according to a preferred embodiment of the invention.
  • a gravure device 4 e.g. a gravure cylinder
  • ink cells 3 according to a preferred embodiment of the invention.
  • each cell 3 is formed by a circular outer wall 31, and a protruding peak 34 in the centre 35 of the cell 3.
  • the gravure device 4 according to the invention is further arranged with means (not shown) for applying an electric field between a gravure cylinder and an impression cylinder.
  • fig 5 there is shown a cross sectional view of an ink cell 3, as shown in fig 4, along C - C in fig. 4.
  • the ink cell 3 has substantially vertical walls 31 and a substantially horizontal bottom 33, having a height h of the walls 31 and a width w of the bottom 33, that depends on screen and tone.
  • an additional peak 34 is protruding vertically, i.e. preferably generally parallel with walls 31.
  • the peak 34 is cone shaped, having its thickest part at the bottom 33.
  • the width W of the thickest part of the peak 34 is in the interval 0.05w - 0.5w, i.e.
  • the height H of the peak 34 is in between 0. lh - 0.9h, i.e. O. lh ⁇ H ⁇ 0.9h, preferably 0.5h ⁇ H ⁇ 0.8h.
  • This additional peak 34 in the centre 35 of the ink cell 3 acts as an attractor for further field lines 10 and the consequence of this is that a lifting force acts on the ink also in the centre 35 of the ink cell 3. In this way the ink may be lifted more uniformly out of the cell 3 and the resulting print dots are full dots without a hole in the middle.
  • the shape of the dots are the result of different interacting forces, e.g.
  • the lifting force now works in principle over the whole ink cell 3. Furthermore the novel arrangement may provide a more uniform pattern of field lines 10 and the ink lifting process is made more uniform, resulting in more predictable tone values, which in turn may result in less proofing. It may also provide more even print out and - in consequence of the resulting better ink coverage - a reduction of ink consumption.
  • the protruding part 34 may have other shapes that creates possibilities to arrange different patterns of field lines 10 which render a possibility to control the print in the macroscopic scale.
  • Fig. 6 shows a view from above of a section of a gravure device 4, e.g. a gravure cylinder, arranged with an alternative embodiment of ink cells 6 according to the invention.
  • each cell 6 is formed by a hexagonal outer wall 61, and a protruding peak 64 in the centre 65 of the cell 6.
  • fig 7 there is shown a cross sectional view of an ink cell 6, as shown in fig 6, along D - D.
  • the ink cell 6 has substantially vertical walls 61 and a substantially horizontal bottom 63, having a height h of the walls 61 and a width w of the bottom 63, that depends on screen and tone.
  • an additional peak 64 is protruding vertically, i.e. preferably generally parallel with walls 61.
  • This additional peak 64 is in the form of a hexagonal cut-off cone having a base width W in the interval 0.08w - 0.8w, i.e. 0.08w ⁇ W ⁇ 0.8w, preferably 0.15w ⁇ W ⁇ 0.6w.
  • the height H of the peak 64 is in between 0. lh - 0.9h, i.e. 0. lh ⁇ H ⁇ 0.9h, preferably 0.5h ⁇ H ⁇ 0.8h.
  • the hexagonal cut-off cone 64 in the centre 65 of the ink cell 6 acts as an attractor for further field lines 10 and the consequence of this is that a lifting force acts even in the middle of the ink cell 6. In this way the ink may be lifted more uniformly out of the cell 6 and the resulting print dots are full dots without a hole in the middle.
  • Fig. 8 is a cross sectional view of still an alternative embodiment of an ink cell 7 according to the invention.
  • the ink cell 7 has substantially vertical walls 71 and a substantially horizontal bottom 73, having a height h of the walls 71 and a width w of the bottom 73, that depends on screen and tone.
  • an additional peak 74 is protruding vertically, i.e. preferably generally parallel with walls 71.
  • the peak 74 has the shape of a pillar having a width W in the interval 0.05w - 0.5w, i.e. 0.05w ⁇ W ⁇ 0.5w, preferably O.lw ⁇ W ⁇ 0.4w.
  • the height H of the pillar is in between O.lh - 0.9h, i.e. O.lh ⁇ H ⁇ 0.9h, preferably 0.5h ⁇ H ⁇ 0.8h.
  • This additional peak 74 in the centre 75 of the ink cell 7 acts as an attractor for further field lines 10 and the consequence of this is that a lifting force acts over the middle of the ink cell 7. In this way the ink may be lifted more uniformly out of the cell 7 and the resulting print dots are full dots without a hole in the middle.
  • Fig. 9 is a cross sectional view of still an alternative embodiment of an ink cell 9 according to the invention.
  • the ink cell 9 is V-shaped having inclined edges 91,92 with a height h and the whole cell 9 has a width w, the height h and the width w depends on screen and tone.
  • an additional peak 94 is protruding vertically.
  • the peak 94 is cone shaped, having its thickest part at the bottom of the cell 9.
  • the width W of the thickest part of the peak 94 is in the interval 0.05w - 0.5w, i.e. 0.05w ⁇ W ⁇ 0.5w, preferably 0. lw ⁇ W ⁇ 0.4w.
  • the height H of the peak 94 is in between O.lh - 0.9h, i.e. O.lh ⁇ H ⁇ 0.9h, preferably 0.5h ⁇ H ⁇ 0.8h.
  • This additional peak 94 in the centre 93 of the ink cell 9 acts as an attractor for further field lines 10 and the consequence of this is that a lifting force acts over the middle of the ink cell 9. In this way the ink may be lifted more uniformly out of the cell 9 and the resulting print dots are full dots without a hole in the middle.
  • the ink cells may have other embodiments than those described above e.g. the ink cells may have an octagonal outer wall and the walls may be slightly inclined or sharply inclined.
  • the protruding part at the bottom may have other embodiments than those described above, the main point is that the protruding part adds further non-horizontal surfaces as contact points for further field lines.
  • Other possible embodiments may for example be a pyramid, an obelisk with e.g. three or four faces, a cut-off cone etc.
  • the protruding part may also be a hollow structure like a ring which is hollow in the middle or a ridge extending over a part or the whole bottom of the ink cell or many shorter ridges. It is also possible to have more than one protruding part in the same ink cell.
  • the different embodiments on the ink cells and the protruding parts described above may of course be combined in different ways than described here.
  • the size, height and width of the ink cell may vary all depending on what is supposed to be printed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Ink Jet (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

L'invention concerne un dispositif d'impression en héliogravure conçu pour l'impression assistée électrostatiquement, qui comprend une surface conçue avec de nombreuses cellules d'encre (3), chacune ayant une partie paroi (31) et une partie fond (33), au moins plusieurs desdites cellules (3) de fond étant disposées avec au moins une partie saillante (34).
EP12749625.5A 2011-02-23 2012-02-22 Dispositif d'impression en héliogravure Not-in-force EP2678161B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1150157A SE535722C2 (sv) 2011-02-23 2011-02-23 Metod och rotogravyrtryckanordning för tryckning medelst ESA-metoden
PCT/IB2012/050799 WO2012114279A1 (fr) 2011-02-23 2012-02-22 Dispositif d'impression en héliogravure

Publications (3)

Publication Number Publication Date
EP2678161A1 true EP2678161A1 (fr) 2014-01-01
EP2678161A4 EP2678161A4 (fr) 2016-06-15
EP2678161B1 EP2678161B1 (fr) 2018-12-05

Family

ID=46720176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12749625.5A Not-in-force EP2678161B1 (fr) 2011-02-23 2012-02-22 Dispositif d'impression en héliogravure

Country Status (3)

Country Link
EP (1) EP2678161B1 (fr)
SE (1) SE535722C2 (fr)
WO (1) WO2012114279A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5910606B2 (ja) * 2013-10-22 2016-04-27 株式会社村田製作所 グラビア印刷版およびその製造方法、グラビア印刷機、ならびに積層セラミック電子部品の製造方法
JP5910605B2 (ja) * 2013-10-22 2016-04-27 株式会社村田製作所 グラビア印刷版およびその製造方法、グラビア印刷機、ならびに積層セラミック電子部品の製造方法
US20210260903A1 (en) * 2018-06-19 2021-08-26 Merck Patent Gmbh Method for producing a virtual three-dimensional pattern in a coating

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697514A (en) * 1965-10-07 1987-10-06 Gravure Association Of America Method and apparatus for transferring ink in gravure printing
DE19642634A1 (de) * 1996-10-16 1998-04-23 Philips Patentverwaltung Druckform für ein Rotations-Hochdruckverfahren
JP3252763B2 (ja) * 1997-07-28 2002-02-04 松下電器産業株式会社 電子部品の製造装置

Also Published As

Publication number Publication date
SE535722C2 (sv) 2012-11-20
EP2678161B1 (fr) 2018-12-05
SE1150157A1 (sv) 2012-08-24
WO2012114279A1 (fr) 2012-08-30
EP2678161A4 (fr) 2016-06-15

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