EP0934164B1 - Rotary press doctor - Google Patents

Description

The invention relates to a doctor blade for an inking unit Rotary printing machine according to the preamble of Claim 1.

The US-A 40 70 964 shows a coated with Teflon Squeegee to reduce the friction between squeegee and Scree.

NL-A-9300810 describes coated with Teflon Squeegee.

It is known to apply ink to rollers and then by means of a doctor blade from the roller, e.g. B. To strip off the anilox roller. Can during operation on one side of the doctor blade facing away from the roller - especially with high viscosity inks - Collect ink.

The invention has for its object a negative an anilox roller adjustable doctor blade for Rotary presses to create with the distracting Color accumulation on the working doctor blade prevented become.

This object is achieved by the features of the characterizing part of claim 1 solved.

The advantages that can be achieved with the invention exist especially in that on the inside of an ink fountain averted, d. H. the side facing the ink metering roller the squeegee (outside), annoying ink accumulations be prevented. Even the smallest "Ink droplets" leave the outside of the Squeegee so that no major distracting Ink deposits can arise that uncontrolled and at random times on the scraped surface of the metering roller and so unwanted color density fluctuations on the Print media - e.g. B. an arch or one Web - generate.

Fig. 1

eine schematische Darstellung eines Querschnittes durch einen oberhalb einer Rasterwalze angeordneten Farbkasten in Arbeits- und Ruhestellung mit Rakelblättern;

Fig. 2

eine vergrößerte schematische Darstellung einer Einzelheit "Z" in Fig. 1.

Embodiments of the invention are shown in the drawing and are described in more detail below. Show it:

Fig. 1

is a schematic representation of a cross section through an ink fountain arranged above an anilox roller in the working and rest position with doctor blades;

Fig. 2

an enlarged schematic representation of a detail "Z" in Fig. 1st

A pivotable paint box 1 with the invention Doctor blades with a working blade 12 and a closing blade 11 is in the working position A on top of one Ink metering roller 4 arranged. The ink metering roller 4 has in its outer surface 2 cells 3.

Seen in the direction of production C, the doctor blade 11 is positioned positively on the ink metering roller 4.
Seen in the direction of production C, the doctor blade 12 is placed negatively on the ink metering roller 4.

The ink fountain 1 consists of two axially parallel Direction of the ink metering roller 4, spaced left 6 and right Side walls 7. Depending on the intended swivel direction the left 6 and / or the right side wall 7 in sufficient height over the entire width of the Ink box 1 extending angled inwards.

The right / left side wall 7, 6 runs from it top edge 10 down so that the clear width the color box 1 z. B. about half the height of Color box 1 enlarged and then in the part underneath narrowed again. This will in the emptying position B of the ink fountain 1 one deepest groove 44 formed in which the Ink 22 runs in and is picked up by it. The side walls 6, 7 extend (working position A) from an upper edge 10 towards its the Ink metering roller 4 facing lower squeegee mounting surface 8th; 9, on which doctor blades 11; 12 by means of Terminal strips 13 and 14 are held.

At the ends of the side walls 6; 7 are on both sides End walls 15; 17 attached. Each end wall 15; 17 is with their side facing the ink metering roller 4 18 Adjusted contour of the lateral surface 2. In its Emptying position B, the ink fountain 1 z. B. the Angle beta = 70 ° to 110 ° around the axis of rotation 5 of the Ink metering roller 4 are pivoted. The doctor blades 11 and 12 remain in contact with the surface 2 the ink metering roller 4. The ink fountain 1 is - in his Working position A seen - open at the top.

The ink fountain 1 can on a cross member 20 z. B. means its side wall 6 on the side frames of the machine be attached.

In another embodiment, both ends are the traverse 20 of the ink fountain 1 on a first End 28 and 29 of a swivel arm 26 and 27 attached. The second ends 31; 32 of the swivel arms 26; 27 are each swiveling on a side frame fixed Bearing bush 33; 34 stored. Each bearing bush 33, 34 takes over a roller bearing 36; 37 a journal 38; 39 of the ink metering roller 4. Through that measures described the ink fountain 1 around Rotation axis 5 of the ink metering roller 4 pivoted become.

In its upper, d. H. Working position A is the Color box 1 directly or indirectly via the to the Swivel arms 26, 27 attached crossbar 20 on one side frame fixed stop 41 moves and there locked or held by screws 42. The lying color box 1 can from its overhead Working position A after its unlocking in an emptying position B can be pivoted. The Doctor blades 11 and 12 remain in contact with the circumference of the ink metering roller 4. The swivel angle Beta the ink fountain 1 can be between 70 and 110 °. The Swiveling movement of the ink fountain 1 downwards, for. B. limited by a side frame fixed stop 43. On this is the right side wall 7 of the ink fountain 1 and is held or locked to it.

The ink 22 collects in an upward direction open channel 44 of the side wall 7, which is is now in a horizontal position.

The ink fountain 1 can, especially in the horizontal Emptying position B, preferably slightly from the machine be removable, d. H. detachable from the traverse 20 be trained. For this, e.g. B. the left side wall 6 except by means of a linear guide in the traverse 20 be feasible and lockable.

In that the ink fountain 1 is removed from the machine is, both the ink fountain 1 and the Ink metering roller 4 can be easily cleaned.

The accessibility of the pivoting of the ink fountain 1 is not limited to the means just described. It is also possible to use the ink fountain 1 with others technical means from position A to position B and to pivot back again.

For example, B. the end walls 15; 17 each with Stud bolts are provided, the stud bolts in side frame-fixed curved guides become.

The color metering elements 11, 12 z. B. ink knife, ink knife blades, doctor blades can, as already said, be arranged and attached to the underside of the ink fountain 1. The doctor blades serve as a working doctor blade 12 and / or as a closing doctor blade 11. When using working doctor blades 12 and closing doctor blades 11, at least the working doctor blade 12 is on the first outer surface 19 (= first surface 19) and / or on the inner surface 21 (= second surface 21 ) coated with a low-energy substance 46. Such substances are e.g. B. PTFE or metal-free amorphous carbon layers "aC: H" (also "DLC" layers - called d iamond- l IKE c arbon layers). These amorphous carbon layers consist of a highly cross-linked carbon network to which hydrogen is attached. By modifying the network structure fluorine (F), silicon (Si), oxygen (0) and nitrogen (N) and the percentages, the surface energy of the DLC layers can be influenced and thus the wetting behavior, hardness and wear can be influenced optionally.

In addition to PTFE, DLC + fluorine (F-DLC); DLC + Silicon (Si-DLC), DLC + oxygen (O-DLC) and DLC + Nitrogen (N-DLC) and DLC + boron (B-DLC) used become. F-DLC and Si-DLC are particularly suitable.

According to another embodiment variant, the surface energy-poor substance 46 can be made of
Hydrocarbon polymers, in particular
Poly (propylene)
or poly (styrene)
and copolymers
consist.

Furthermore, the surface energy-poor substance 46 from styrene polymers, in particular from Poly (styrene-stat-2,2,3,3-tetrafluoropropyl methacrylate) consist.

Poly(chlorotrifluoroethylen)

oder

Poly(chlorotrifluoroethylen-stat-tetrafluoroethylen)

oder Poly(hexafluoropropylen)

oder Poly(tetrafluoroethylen)

oder Poly(tetrafluoroethylen-stat-ethylen)

oder Poly(trifluoroethylen)

bestehen. Furthermore, the surface energy-poor substance 46 can be made from halogenated hydrocarbon polymers, in particular from

Poly (chlorotrifluoroethylene)

or

Poly (chlorotrifluoroethylene-stat-tetrafluoroethylene)

or poly (hexafluoropropylene)

or poly (tetrafluoroethylene)

or poly (tetrafluoroethylene-stat-ethylene)

or poly (trifluoroethylene)

consist.

Poly((heptafluoroisopropoxy)ethylen)

oder Poly(1-((heptafluoroisopropoxy)methyl)

propylen-stat-maleic acid)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from vinyl polymers, in particular from

Poly ((heptafluoroisopropoxy) ethylene)

or poly (1 - ((heptafluoroisopropoxy) methyl)

propylene-stat-maleic acid)

consist.

Poly((1-chlorodifluoromethyl)tetrafluoroethyl acrylat)

oder Poly(di(chlorodifluoromethyl)fluoromethyl acrylat)

oder Poly(1,1-dihydroheptafluorobutyl acrylat)

oder Poly(1,1-dihydropentafluoroisopropyl acrylat)

oder Poly(1,1-dihydropentadecafluorooctyl acrylat)

oder Poly(heptafluoroisopropyl acrylat)

oder Poly(5-(heptafluoroisopropoxy)pentyl acrylat)

oder Poly(11-(heptafluoroisopropoxy)undecyl acrylat)

oder Poly(2-(heptafluoropropoxy)ethyl acrylat)

oder Poly(nonafluoroisobutyl acrylat)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from fluorinated acrylic polymers, in particular from

Poly ((1-chlorodifluoromethyl) tetrafluoroethyl acrylate)

or poly (di (chlorodifluoromethyl) fluoromethyl acrylate)

or poly (1,1-dihydroheptafluorobutyl acrylate)

or poly (1,1-dihydropentafluoroisopropyl acrylate)

or poly (1,1-dihydropentadecafluorooctyl acrylate)

or poly (heptafluoroisopropyl acrylate)

or poly (5- (heptafluoroisopropoxy) pentyl acrylate)

or poly (11- (heptafluoroisopropoxy) undecyl acrylate)

or poly (2- (heptafluoropropoxy) ethyl acrylate)

or poly (nonafluoroisobutyl acrylate)

consist.

Poly(benzyl methacrylat)

oder Poly(n-butyl methacrylat)

oder Poly(isobutyl metharcrylat)

oder Poly(t-butyl methacrylat)

oder Poly(t-butylaminoethyl methacrrylat)

oder Poly(dodecyl methacrylat)

oder Poly(lauryl methacrylat)

oder Poly(ethyl methacrylat)

oder Poly(2-ethylhexyl methacrylat)

oder Poly(n-hexyl methacrylat)

oder Poly(dimethylaminoethyl methacrylat)

oder Poly(hydroxyethyl methacrylat)

oder Poly(lauryl methacrylat)

oder Poly(phenyl methacrylat)

oder Poly(n-propyl methacrylat)

oder Poly(stearyl methacrylat)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from non-fluorinated methacrylic polymers, in particular from

Poly (benzyl methacrylate)

or poly (n-butyl methacrylate)

or poly (isobutyl methacrylate)

or poly (t-butyl methacrylate)

or poly (t-butylaminoethyl methacrylate)

or poly (dodecyl methacrylate)

or poly (lauryl methacrylate)

or poly (ethyl methacrylate)

or poly (2-ethylhexyl methacrylate)

or poly (n-hexyl methacrylate)

or poly (dimethylaminoethyl methacrylate)

or poly (hydroxyethyl methacrylate)

or poly (lauryl methacrylate)

or poly (phenyl methacrylate)

or poly (n-propyl methacrylate)

or poly (stearyl methacrylate)

consist.

Poly(1,1-dihydropentadecafluorooctyl metharylat)

oder Poly(heptafluoroisopropyl methacrylat)

oder Poly(heptadecafluorooctyl methacrylat)

oder Poly(1-hydrotetrafluoroethyl methacrylat)

oder Poly(1,1-dihydrotetrafluoropropyl mehacrylat)

oder Poly(1-hydrohexafluoroisopropyl methacrylat)

oder Poly(t-nonafluorobutyl methacrylat)

oder Poly(styren-stat-2,2,3,3-terafluoropropyl methacrylat)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from fluorinated methacrylic polymers, in particular from

Poly (1,1-dihydropentadecafluorooctyl metharylate)

or poly (heptafluoroisopropyl methacrylate)

or poly (heptadecafluorooctyl methacrylate)

or poly (1-hydrotetrafluoroethyl methacrylate)

or poly (1,1-dihydrotetrafluoropropyl polyacrylate)

or poly (1-hydrohexafluoroisopropyl methacrylate)

or poly (t-nonafluorobutyl methacrylate)

or poly (styrene-stat-2,2,3,3-terafluoropropyl methacrylate)

consist.

Furthermore, the surface energy-poor substance 46 made of polyether copolymers, for. B. from
Poly (oxyethylene-stat-oxypropylene) -block-poly (oxydimethylsilylene) -block-poly (oxyethylene-stat-oxypropylene)
consist.

Poly((benzoylimino)ethylen)

oder Poly((butyrylimino)ethylen)

oder Poly((dodecanoylimino)etylen)

oder

Poly((dodecanoylimino)ethylen-stat-(acetylimino)trimethylen)

oder Poly((heptanoylimino)ethylen)

oder Poly((hexanoylimino)ethylen)

oder Poly(((3-methyl)butyrylimino)ethylen)

oder Poly((pentadecafluorooctadecanoylimino)ethlen)

oder Poly((pentanoylimino)ethylen)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from polyimines, in particular from

Poly ((benzoylimino) ethylene)

or poly ((butyrylimino) ethylene)

or poly ((dodecanoylimino) ethylene)

or

Poly ((dodecanoylimino) ethylene-stat- (acetylimino) trimethylene)

or poly ((heptanoylimino) ethylene)

or poly ((hexanoylimino) ethylene)

or poly (((3-methyl) butyrylimino) ethylene)

or poly ((pentadecafluorooctadecanoylimino) ethlene)

or poly ((pentanoylimino) ethylene)

consist.

Poly(methylendiphenyldiisocyanat-alt-(butanediol

poly(oxytetramethylen)diol)

oder Poly(hexamethylen diisocyanat-alt-triethylen glycol)

oder Poly(4-methyl-1,3-phenylen

diisocyanat-alt-tripropylen glycol)

bestehen.Furthermore, the surface energy-poor substance 46 can be made from polyurethanes, in particular from

Poly (methylene diphenyl diisocyanate-alt- (butanediol

poly (oxytetramethylene) diol)

or poly (hexamethylene diisocyanate-old-triethylene glycol)

or poly (4-methyl-1,3-phenylene

diisocyanate-alt-tripropylen glycol)

consist.

Poly(oxydimehylsilylen), Alpha, Omega-difuncional R-(Si(CH₃)₂-O-)_n-Si(CH₃)₂-R

oder Poly(oxydimethylsilylen) Block Co-Polymeren

bestehen.The substance 46 can also consist of polysiloxanes, in particular of

Poly (oxydimehylsilylene), alpha, omega-difuncional R- (Si (CH ₃ ) ₂ -O-) _n -Si (CH ₃ ) ₂ -R

or poly (oxydimethylsilylene) block copolymers

consist.

3-(1,1-Dihydroperfluorooctoxy)propyltriethoxysilan, CF₃(CF₂)₆CH₂O (CH₂)₃ Si(OC₂H₅)₃

oder Gamma-Perfluoroisopropoxypropyltrimethoxysilan, (CF₃)₂ CFO(CH₂)₃ Si(OCH₃)₃

bestehen.Substance 46 can also be made from hydrolyzed and condensed organosilanes, in particular from

3- (1,1-dihydroperfluorooctoxy) propyltriethoxysilane, CF ₃ (CF ₂ ) ₆ CH ₂ O (CH ₂ ) ₃ Si (OC ₂ H ₅ ) ₃

or gamma-perfluoroisopropoxypropyltrimethoxysilane, (CF ₃ ) ₂ CFO (CH ₂ ) ₃ Si (OCH ₃ ) ₃

consist.

Finally, it is also possible to use the aforementioned Polymers individually or in a mixture of two and several of the polymers mentioned as substance 46 use.

The substances 46 are coated in one Thickness, e.g. B. is between 0.5 and 10 microns.

At least the outer surface 19 of the Working doctor blade 12 coated on the surface that the ink metering roller 4 - it can be used as an anilox roller 4 or Roller 4 with an oleophilic jacket - is facing. This outer surface 19 can be entirely or but only partially with substances 46 be coated, for. B. only near the rollers Area 47. This area 47 begins at the Doctor blade surface 23 and extends over the entire Length of the working doctor blade 12 and has a width b e.g. B. from 0.5 to 10 mm. The inside of the color box 1 - d. H. the color box interior (= Ink storage space) - facing inner surface 21 of the Working squeegee sheet 12 can also, just like describe, be coated.

The closing doctor blade 11 can in the same way as the doctor blade 12 may be coated.

The doctor blade surface 23 - it is in contact with the Surface of the ink metering roller 4 - can also with the surface energy-poor substances 46 coated his.

A coating of the doctor blades 11, 12 in the above described way is also arbitrary when using viscous inks make sense.

It is of course also possible to use the doctor blades 11; 12th at the same angle of inclination to the ink metering roller 4 to employ.

One of the side walls 7; 6 is preferably such angled that a between the upper partial side wall 30th and lower partial side wall 35 formed opening angle Gamma of approx. 90 ° towards the inside of ink fountain 1 opens. A width d of the upper Partial side wall 30 is equal to a width e of the lower one Be partial side wall 35. However, d can also be greater than e or the other way around. At 45 is a longitudinal axis of the Color box 1 and with 48 is a vertical axis of the Color box 1 designated.

The ink fountain 1 is preferably - based on a right-angled coordinate system with the origin on the axis of rotation 5 of the ink metering roller 4 - from his in the 1st or 2nd quadrant or in the 1st and 2nd quadrant lying working position A - based on the position of the Doctor blades 11 on the ink metering roller 4 - in a I. and IV. Quadrants or in II. And III. Quadrants horizontal emptying position swiveled (position of the Doctor blades 11, 12). The ink fountain 1 is therefore out a position in which the transverse axis 40 of the ink fountain 1 runs horizontally or approximately horizontally, see above pivots that after pivoting the transverse axis 40th of the color box 1 vertically or approximately vertically runs.

Furthermore, it is possible to paint box 1 above, d. H. form closed at its upper edge 10.

The coating of the doctor blade 11; 12 used Low surface energy substance 46 has one Surface energy or surface tension in the area between 10 and 60 mN / m.

The doctor blade 11; 12, as a carrier for the substance 46 is made of metal.

Reference list

1

Paint box

2nd

Lateral surface (4)

3rd

Cell (4)

4th

Ink metering roller

5

Axis of rotation

6

Sidewall, left (1)

7

Right side panel (1)

8th

Squeegee mounting surface (6)

9

Squeegee mounting surface (7)

10th

Upper edge (15; 17)

11

Closing blade (1)

12th

Doctor blade (1)

13

Terminal strip (12)

14

Terminal strip (11)

15

Bulkhead, front

16

Tangent (2)

17th

Bulkhead, rear (6; 7)

18th

Page (17)

19th

Outer surface (12)

20th

traverse

21

Inner surface (12)

22

Printing ink

23

Doctor surface (12)

24th

Paint roller (22)

25th

Inner surface (11)

26

Swivel arm (1)

27

Swivel arm (1)

28

End, first (26)

29

End, first (27)

30th

Partial side wall, upper (7)

31

End, second (26)

32

End, second (27)

33

Bearing bush

34

Bearing bush

35

Partial side wall, lower (7)

36

roller bearing

37

roller bearing

38

Axle journal

39

Axle journal

40

Transverse axis (1)

41

attack

42

screw

43

attack

44

Gutter

45

Longitudinal axis (1)

46

substance

47

Area

48

Vertical axis

A

Working position (1)

B

Emptying (1)

C.

Production direction (4)

d

Width (30)

e

Width (35)

alpha

Angle of attack (12)

beta

Swivel angle (1)

gamma

Opening angle (30; 35)

Claims (26)

1. Doctor blade of metallic design, set with a negative angle against an engraved roll (4), characterized in that on its outer face (19) facing the engraved roll (4), the doctor blade (11; 12) is coated with a low-surface-energy substance (46) which has a surface energy between 10 and 60 mN/m.
2. Doctor blade according to Claim 1, characterized in that the substance (46) consists of a polymer.
3. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of hydrocarbon polymers.
4. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of styrene polymers.
5. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of halogen-hydrocarbon polymers.
6. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of vinyl polymers.
7. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of fluorinated acrylate polymers.
8. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of nonfluorinated methacrylate polymers.
9. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of fluorinated methacrylate polymers.
10. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of polyether copolymers.
11. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of polyimines.
12. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of polyurethanes.
13. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of polysiloxanes.
14. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of hydrolyzed and condensed organosilanes.
15. Doctor blade according to Claims 1 and 2, characterized in that the substance (46) consists of polytetrafluoroethylene (PTFE).
16. Doctor blade according to Claims 2 to 15, characterized in that the substance (46) consists of a polymer or of a mixture of two or more polymers.
17. Doctor blade according to Claim 1, characterized in that the substance (46) consists of metal-free, amorphous carbon layers (DLC layers) with highly crosslinked carbon networks, to which hydrogen is added.
18. Doctor blade according to Claim 17, characterized in that the DLC layers are modified with fluorine (F-DLC).
19. Doctor blade according to Claim 17, characterized in that the DLC layers are modified with silicon (Si-DLC).
20. Doctor blade according to Claim 17, characterized in that the DLC layers are modified with boron (B-DLC).
21. Doctor blade according to Claim 17, characterized in that the DLC layers are modified with nitrogen (N-DLC).
22. Doctor blade according to Claim 17, characterized in that the DLC layers are modified with oxygen (O-DLC).
23. Doctor blade according to Claims 1 to 22, characterized in that the substance (46) is applied with a layer thickness of 0.5 to 10 µm.
24. Doctor blade according to Claim 1, characterized in that the the [sic] doctor blade (11; 12) acts together with a high-viscosity printing ink.
25. Doctor blade according to Claim 1, characterized in that the doctor blade (11; 12) is arranged on an ink fountain (1), and in that the ink fountain (1) is arranged at the top of the engraved roll.
26. Doctor blade according to Claim 1, characterized in that a working doctor blade (12) and a closing doctor blade (11) are provided, and in that at least the working doctor blade is coated with this substance on the outside.

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