EP2393662B1 - Spraying module for spraying the outer surface of a rotating cylinder - Google Patents

Description

The invention relates to a spray module for an offset printing machine, which cooperates with a surface of a, a printing plate-carrying plate cylinder or a non-printing plate-bearing roller.

[State of the art]

From the DE 622 359 is an inking unit for printing machines known, wherein the ink is sprayed through a spray nozzle on a paint roller. The spray area is enclosed by a plurality of walls which form gaps with the surface of the inking roller. At these columns, the walls each have channels, is sucked through which excess color coded and fed to a known suction device.

A spray dampening module of this kind is for example from the EP 1 004 436 B1 known. This spray dampening unit has a single nozzle and an upper rigid and a lower rigid panel. The two diaphragms extend over the entire width of the spray dampening unit and are directed to a printing cylinder. The diaphragms are there to form a space in the space between them, ie a catchment area, which is intended to ensure a propagation of spray in a desired direction.

The EP 0 344 409 A2 shows a Sprühfeuchtwerk bar with multiple nozzles and an upper and a lower panel. Both panels are independently pivotable and extend over the entire width of the Sprühfeuchtwerk beam. The pivotability of the two panels is used to allow access to the spray nozzles of Sprühfeuchtwerk beam.

From the EP 0621 132 is a Sprühfeuchtwerk- bar with several spray nozzles has become known, the Bel per spray nozzle is provided a pivotable aperture. This panel is in each case a dosing with holes. This metering orifice can be swiveled into the spray cone to cover the spray cone horizontally as desired. The holes in the metering orifice are used to maintain a minimum moistening in the area covered by it. This spray dampening bar is not suitable for direct humidification of printing plates. It must be provided an intermediate roll.

By the EP 03 44 409 A2 is a dampening spray bar has become known, which has a plurality of juxtaposed spray nozzles. The spray nozzles spray in a horizontal long body of an upper and a lower hinged spray bar length spray shield. Foldable, therefore, to allow access to the roller to be wetted.

By DE 26 58 875 a spray dampening module according to the preamble of claim 1 is known.

OBJECT OF THE INVENTION

The invention has for its object to provide a device for the contactless application of a liquid, e.g. Dampening water, to create a pressure plate or shell of a roller.

This object is achieved by the features of claim 1.

The device for contactless wetting on which this invention is based advantageously makes it possible to achieve particularly accurate wetting of the printing plate during offset printing.

Advantageously, when used for moistening, it is possible to dispense with jet dampening units whose dampening solution metering quantity is controlled by pulsing the nozzles and / or by changing the rotational speed of an intermediate wet ductor. This has the advantage that the irregularities in the print image caused by the detrimental pulses of the fountain solution, especially in high-speed machines, is avoided. In addition, the device according to the invention has the advantage that the formation of the flat jet is always the same because it does not occur frequency-dependent. This, in turn, with the use of flat jet nozzles has a positive effect on the uniform distribution of the spray over the entire spray or spray pattern when applied liquid. The tolerances of the plurality of spray nozzles of the same type used on a spray bar have the result that at the same spray pressures, theoretically and practically, each spray nozzle used can deliver one to the adjacent, different large amount of spray per unit time.

Thus, different amounts of fountain solution per unit time and per spray nozzle would be delivered, which would show up in the printed image. This has been adversely affected by a complex change in the frequency of "pulsing" of the dampening solution, with more or less success, trying to compensate.

The embodiments of the diaphragm arrangement according to the invention described below can also be used in a spray dampening unit of a printing machine, in particular a rotary offset printing machine and in a printing unit of a web or sheet-fed rotary printing press.

The present invention will be explained in more detail below with reference to schematically illustrated exemplary embodiments in conjunction with the drawings listed below.

Figur 1

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit beide Dosierblenden in, Sprühstellung;

Figur 2

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit beide Dosierblenden, in Sprühschlussstellung;

Figur 3

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit nur der linken steuerbaren Dosierblende, in Sprühschlussstellung und motorischem Verstellantrieb;

Figur 4

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit nur der rechten steuerbaren Dosierblende, in Sprühstellung und motorischem Verstellantrieb;

Figur 5

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit nur der linken steuerbaren Dosierblende, in Sprühschlussstellung und Handverstellungsantrieb;

Figur 6

eine schematische Seitenansicht des erfindungsgemäßen Sprühfeuchtmoduls mit der einer steuerbaren Dosierblende und einer, mit dieser zusammenwirkenden, steuerbaren Abschlussblende in Sprühstellung und Handverstellungsantrieb;

Figur 7

eine schematische Draufsicht auf einen erfindungsgemäßen Sprühfeuchtmodulbalken mit einer Mehrzahl von erfindungsgemäßen Sprühfeuchtmodulen, jedoch ohne Abschlussblenden und ohne Dosierblenden mit nur der linken steuerbaren Dosierblende, in Sprühschlussstellung und Handverstellungsantrieb;

Figur 8a

eine schematische Vorderansicht auf eine Dosierblende mit einem nicht geraden oberen Ende mit einer nicht geraden Kante;

Figur 8b

eine schematische Seitenansicht auf die Dosierblende nach Figur 8a.

Show it

FIG. 1

a schematic side view of the spray dampening module according to the invention with both metering in, spray position;

FIG. 2

a schematic side view of the spray dampening module according to the invention with both Dosierblenden, in Sprühschlussstellung;

FIG. 3

a schematic side view of the spray dampening module according to the invention with only the left controllable metering orifice, in Sprühschlussstellung and motorized adjustment;

FIG. 4

a schematic side view of the spray dampening module according to the invention with only the right controllable metering orifice, in spray position and motorized adjustment;

FIG. 5

a schematic side view of the spray dampening module according to the invention with only the left controllable metering orifice, in Sprühschlussstellung and manual adjustment drive;

FIG. 6

a schematic side view of the spray dampening module according to the invention with a controllable metering and a, cooperating with this, controllable cover in spray position and manual adjustment drive;

FIG. 7

a schematic plan view of a spray dampening module according to the invention with a plurality of spray dampening modules according to the invention, but without shutters and without metering with only the left controllable metering, in Sprühschlussstellung and manual adjustment drive;

FIG. 8a

a schematic front view of a Dosierbrende with a non-straight upper end with a non-straight edge;

FIG. 8b

a schematic side view of the metering after FIG. 8a ,

The following description is a description of the objects in the view of their associated figures.

Each individual spray nozzle will have its own e.g. have "specific" spray pattern, due to the tolerances in length, cross-sectional shape, cross-sectional size and direction of the nozzle channel of the respective spray nozzle. The result of this is that because of the predetermined spray distance from the nozzle orifice, different spray nozzles have different spray technical values such as: liquid density, droplet size, spray pattern, etc., which must be adjusted later.

With the method and devices according to the invention, these specific differences can be compensated in the simplest way. In addition, the amount of liquid dispensed, e.g. Dampening agent quantity, easily matched to the printed image, since the applied amount of fountain solution depends on the printed image. A full area requires more dampening solution than a plain text area.

So far, this attempt has been made to compensate for dampening systems by providing two nozzles per newspaper page and controlling them via the pulse rate, which in turn brought about the problems described above.

From the "Pulstechnik" solve the solutions of this invention in an inventive manner. Here, a spray module, e.g. Nozzle moistening module proposed which does not have the disadvantages described above.

The spray modules 01 according to the invention operate with spray nozzles 04, which spray continuously. This ensures at a predetermined dampening medium pressure in each case a "typical" formation of a spray pattern for each spray nozzle 04. For the purpose of this invention, flat jet spray nozzles 04 which generate a flat jet 57, eg with an elliptical spray pattern or eg a flat jet with a rectangular spray pattern, are particularly suitable , However, it is also possible to use flat-jet spray nozzles in deflector or baffle plate design, which produce a spray pattern with relatively sharp edges. The practical spray width 54 along a surface line of a lateral surface 02 is determined by the choice of the size of the opening angle of the spray angle eta of the spray nozzle 04 and the choice of their spray distance 63 to the lateral surface 02. The spray width 54 corresponds to the respective injection length in millimeters along a surface line on the lateral surface 03, it is for example in a range between 50 to 70 millimeters. The opening angle eta of the spray angle is for example between 15 ° and 150 °.

The invention is based on a method of spraying a liquid, e.g. Dampening water, on a lateral surface 02 of a rotating cylinder 03 or roller, e.g. a printing cylinder 03, an offset rotary printing machine with at least one spray nozzle 04, which generates a continuous, pressurized liquid spray 06. This liquid or in particular dampening spray 06 is characterized by the kinetic energy inherent to the nozzle outlet in the direction of the co-rotating outer surface 02 of the cylinder 03 or roller between two opposing left metering orifice 12 and an right metering orifice cooperating therewith 13 formed dosing 11 moves. The Dosierblenden 12,13 have ever, at their the outer surface facing the ends 02 and 14 a continuous left edge 16 and continuous right edge 17. The metering orifices 12 and 13 are parallel or approximately parallel to the axis of rotation 21 of the cylinder or roller 03 at a short distance a (eg 0.3mm) on the circumference 05 out and from him movable. The metering orifices 12, 13 are angled toward one another and can be moved individually or jointly in or counter to the direction of rotation of the cylinder or roller 03. Both ends 14,15 and, edges 16 and 17 of the left-12 and right metering 13 can finally touch in a final position 18. Here, a Schnittwinkel- or wedge angle (delta) called between the two, along the two flat inner surfaces 28,40 of the metering orifices 12 and 13 spanned levels reached its smallest possible value. From this closing position 18, both metering orifices 12 and 13 are moved so as to move away from each other for metering, so that between their edges 16 and 17 a rectangular exit slit 19 for the exit spray jet 57 of the liquid or dampening spray 06 in the direction to be humidified lateral surface 02 of the cylinder or roller 03. The rectangular exit slit 19 has an adjustable gap width (b), the example between 0mm and 15mm. The length I of the exit slit 19 per spray nozzle 04 extending parallel to the axis of rotation 21 of the cylinder 03 may be e.g. 50mm to 70mm, but also longer or shorter. The length of the outlet gap 16 preferably corresponds to the distance of the centers of the outer nozzle opening in each case two adjacent spray nozzles 04.

The rectangular exit slit 19 is preferably at a small (for example, about 0.5 mm) distance a from the lateral surface 02. The distance a varies according to the size of the pivoting angle of the metering orifice 12, 13.

The spray flat jet 57 of the spray nozzles 04, in contrast to the prior art, neither "topped" above, below, right or left by means of a sharp "barrier".

In the invention act by the arrangement of at least on each of its inner side 22,23 flat surface in an acute angle of attack (delta) to each other extending metering orifices 12,13 as a hopper with a rectangular outlet. So a hopper with opposing flat walls. The injected between the inner sides 22,23 of the two metering orifices 12, 13 in spray flat jet 57, for. The "liquid mist spray flat jet 10 is reformed in its rectangular cross-sectional shape on its way to the exit slit 19 and deliberately loses part of its liquid or dampening mass." Finally, the compacted dampening mist flows out of the opened rectangular exit slit 19 finally strikes on the lateral surface 02 of the cylinder 03 and wets it.

By widening or narrowing the exit slit 19 by corresponding disassembly of the two dosing orifices 12, 13, the amount of dampening solution delivered per unit area through the exit slit 19 can be changed.

The spray module 01 according to the invention preferably for wetting a rotating surface 02 of a cylinder 03 or roller, e.g. a printing unit cylinder, an offset rotary printing machine has at least one spray nozzle 04 for generating a continuous spray jet 57 of a spray 06. The spray module 01 has a mounting space 07 between two mutually spaced shutters 08.09. They are directed in the direction of the lateral surface 02. To each other they run at an acute angle (wedge angle) theta.

It can be applied to a swiveling dosing orifice e.g. dispensed with the right metering orifice 13 and instead a rigid cover, e.g. the right cover 09, can be used.

Within the mounting space 07, a dosing space 11 separated from the mounting space 07 by at least one metering orifice 12, 13 oriented in the direction of the lateral surface 02 is formed. The spray direction 52 of the spray nozzle 04 is directed into the dosing space 11. The dosing diaphragm 12 and / or 13 is in the mounting space 07, the dosing 11 enlarging or decreasing in the direction of the arranged opposite the end trim, for example 09 ( FIG. 3 ) pivotable.

The dosage of the amount of liquid, for example, the amount of fountain solution, across the width of a printing plate, as well as the adaptation to speed of the printing press can be done via at least one pivotable or elastically bendable metering orifice 12 or 13. The metering orifices 12, 13 are preferably in the exemplary embodiment as stainless, flexurally elastic and metallic leaf springs executed. The dosing 12,13 could also be made of high-strength flexurally elastic plastic. The metering orifices 12, 13 are, for example, bent at an obtuse angle, with the folding line 32 being located, for example, at the beginning of the lower third of the length of the metering orifices 12, 13. The angled embodiment of the metering orifices 12, 13 makes it possible to shorten the travel of the metering orifices 12, 13 because their adjustment does not have to be performed over their extended length. In each case, - seen from its lower end 33, just before the Abkantlinie 32 is the force application of the adjusting devices 26; 27 on the metering 12 or 13 to deflect them from their respective position.

Instead of the elastic leaf spring design, a hinge could also be provided along the imaginary bending line 32 between the lower third and the remaining two-thirds of the length of the metering orifices 12, 13. This design is however more expensive.

The last part 33 of the lower third of the metering orifices 12,13 is provided as an abutment of the leaf-spring-like metering orifices 12,13. The lower end 33 of the metering orifice 12 is in a left terminal block 34, the lower end 30 of the right metering orifice 13 is mounted in a right-hand terminal block 30. Both terminal strips 34 and 30 are spaced from each other at the bottom 46 of a U-shaped holder 47 attached. On the outside e.g. of the left leg 38 of the U-shaped holder 47 is mounted against the environment sealed gear box 48. Inside the gearbox 48, there is the drive 49 for one or both metering orifices 12, 13. The right leg 39 of the holder 47 is not occupied.

Through the interior of a U-shaped holder 47, a tube 41 leads to the common supply of spray modules 01 lined up side by side with a pressurized liquid, eg wet liquid. In its upper, the metering chamber 11 facing part a plurality of threaded through the pipe wall threaded holes are provided. At each a threaded bore a spray nozzle 04 is connected in each case. The interior of the tube 41 is continuously filled with a pressurized liquid, such as dampening solution. Several spray modules 01 can be arranged and fastened next to one another on the feed pipe 41 and form a spray bar 42. In order to secure the spray bar 42 between side frames of a printing unit, not shown, a left - 58 and a right side plate 59 is provided. On the inner wall of the left side shield 58, a left pad 61 is attached. On the inner wall of the right side shield 58, a right block 62 is attached. In holes in the blocks 61,62 one end of the tube 41, which serves as a spray module 44, arranged rotationally fixed.

The following angle data with respect to the area of the spray jet direction angle gamma refer to a rectangular coordinate system whose zero point 0 coincides with the axis of rotation 21 of the cylinder 03 to be sprayed.

The spray bar 42 according to the invention is provided with a plurality of mounted spray modules 01 each having a spray nozzle 04 with e.g. each carry a nozzle tip 25, provided. The spray nozzles 04 each generate a spray jet 57 which is directed onto the lateral surface 02 and can be sprayed with a liquid, e.g. Moisture, wetted. The spray direction 52 of the spray nozzle 04 is in each case inclined to the vertical that the "stray" liquid on the inner sides 28,60 of the shutters 08,09 in the space between the inside 28,60 of the cover 08 and 09 and outside 45,55 associated metering orifice 12 and 13 can run back in the direction of gravity, without disturbing the spray jet 57

The central jet 50 is the spray jet which passes through the nozzle bore center and moves along the spray direction 52.

The spray direction 52 of the spray nozzles 04 of the spray modules 01 and thus also the (theoretical) central jet 50 is therefore always aligned with the lateral surface 02 and the axis of rotation 21 of the cylinder 03 or at least directed. The nozzle 04 is inclined to a, the rotation axis 21 intersecting horizontal plane so that the respective spray jet direction angle gamma, which is the angle between the horizontal plane and the central beam 50 of the nozzle 04, on the lateral surface 02 at an angle of 30 ° is directed to 150 ° ..

The practical spray width 54 corresponds to a fraction of the width of the lateral surface 02 of the cylinder 03.

The arrangement of the spray modules 01 and the spray bar 42 in the manner just described thus has the particular advantage that the "stray" liquid, e.g. Dampening water does not disturb the spray jet 57 to a large extent, because the "stray" liquid on the inner sides 28, 60 of the end covers 08, 09 in the space between inner side 28, 60 of the end cover 08, 09 and outer side 45, 55 of the associated metering orifice 12, resp 13 can run back in the direction of gravity. An exception occurs as soon as the outer edge 16 or 17 with a straight extension on the cover plate 08 and 09 is sealingly applied.

The cover panels 08, 09 on their inner side 28, 60 and / or the metering panels 12, 13 on their outer side 40, 45 may preferably be provided with a coating that promotes dampening solution flow. For example, coatings are suitable Nanostructures on these surfaces, so-called nano coatings containing micro particles (nano particles). These surfaces become superhydrophobic (stray wet liquid droplets which reach the mentioned surfaces, form beads and run off easily) or super hydrophilic (stray wet liquid droplets which reach the mentioned surfaces form a liquid film and possibly run off easily Principle of sharkskin shaped foil can be applied.

Since the spray pattern does not form linearly across the width in the case of the wet module 01 according to the invention and the spray quantity tolerance is also of the order of 5-10%, this can be compensated by the design and setting of the metering orifices 12, 13. The dosage of the differently required amount of water in the printed image can be much more accurate by adjusting the metering 12,13. The pivoting angles of the metering orifices 12 and 13 can be changed either manually by means of an adjusting screw 26 or each with an electromotive remote adjustment 28, 29.

In the case of the spray module 01 according to the invention, an advantage can also be seen in the fact that a vacuum strip 29, 31 can be attached to each of the ends of the end covers 08, 09. These have the purpose of evacuating stray water droplets that are outside of the spray module 01. This has the advantage that no uncontrolled liquid mist gets into the printing unit.

The edges 16, 17 of the dosing 12,13 need not be rectilinear. They can also be a different shape, for example, arcuate (See also Figures 8a, 8b ).

The spray modules 01 are juxtaposed in a horizontal direction on a holding device 43, e.g. the pipe 41 are arranged and fixed to a spray bar 44.

The spray nozzles 04 can also be used to facilitate their rapid replacement, by means of so-called. Mounting clamps or so-called. Klappschellen be attached.

The cover panels 08, 09 extend at least over the width of a spray module 01. Preferably, they extend in several pieces over a plurality of spray modules 01 or in one piece over all the spray modules 01, ie over the entire length of the spray bar 42.

In a single drive of the metering orifice 12,13 a return spring 24, for example, a pressure plate spring is provided. Their force application acts on the lower third of the length of the metering orifice 12,13 their abutment is attached to the bottom 46. The return spring 24 has the task of pressing the metering orifice 12, 13 in the direction of the associated cover plate 08, 09.

LIST OF REFERENCE NUMBERS

01

spray module

02

Lateral surface (03)

03

Cylinder, roller

04

spray nozzle

05

Circumference (03)

06

spray

07

mounting space

08

Cover on the left

09

End panel right

10

Spray fan jet

11

metering

12

Metering panel on the left

13

Metering panel on the right

14

End (12)

15

End (13)

16

Edge (12)

17

Edge (13)

18

final position

19

Exit slit (12; 13)

20

Sprühkegelzentrum

21

Rotation axis (03)

22

Inside (12)

23

Inside (13)

24

compression spring

25

Nozzle mouthpiece

26

screw

27

actuator

28

Inside (08)

29

Vacuum strip (08)

30

End, lower (13)

31

Vacuum strip (09)

32

opening line

33

End, lower (12)

34

Fixing strip (13)

35

Fixing strip (12)

36

strip

37

screw

38

Thigh left (47)

39

Thigh right (47)

40

Level, horizontal

41

pipe

42

spray

43

Holding device (01)

44

Sprühmodulhalter

45

Outside (12)

46

Floor (47)

47

Holder U-shaped

48

gearbox

49

drive

50

central beam

51

Just

52

spray direction

53

arc length

54

spray width

55

Outside (13)

56

Level, vertical

57

spray

58

Side shield, left

59

Side shield, right

60

Inside (09)

61

Klotz, left

62

Klotz, right

63

spraying distance

alpha

Bending angle (08.09)

beta

Bending angle (12,13)

gamma

Spray direction angle

delta

Wedge angle (12,13)

eta

Spray angle (04)

theta

Wedge angle (08,09)

Claims (14)

1. Spray module (01) for spraying an outer surface (02) of a cylinder or roll (03) rotating around its axis of rotation (21), e.g. of a printing unit cylinder, of a rotary printing press with a liquid mist via a spray nozzle (04), the spray module (01) has a mounting space (07) between two closing apertures (08, 09) at a distance from one another, a resizeable metering chamber (11) is provided between the closing apertures (08, 09), the spray nozzle (04) is arranged in the metering chamber (11), the metering chamber (11) consists of two metering apertures (12, 13) at a distance from one another - and pivotable or flexibly elastic, characterized in that the metering apertures (12, 13) are angled at an obtuse angle (beta) and the two inner sides (22, 23) thereof in each case lie with the obtuse angle (beta) opposite their inner side (22, 23), the closing apertures (08, 09) and metering apertures (12, 13) are aligned on the outer surface (02) and supported on the spray module (01), the central jet (50) of the spray nozzle (04) and thus the spraying direction (52) of the spray nozzle (04) is in the metering space (11), directed at the outer surface (02) and the axis of rotation (21) in a spray jet direction angle (gamma), the spray jet direction angle (gamma) lies, relative to a horizontal plane (40) dissecting the axis of rotation (21) of the cylinder or roll (03), in a region from 30° to 150° in the IIIrd to IVth quadrant of a rectangular coordinate system, the centre of which is on the axis of rotation (21).
2. Spray module (01) according to Claim 1, characterized in that the ends (14, 15) of the metering apertures (12, 13) are arranged at a distance from the outer surface (02) of the cylinder (03).
3. Spray module (01) according to Claims 1 or 2, characterized in that the closing apertures (08, 09) are in each case angled at an obtuse angle (alpha) and in that their obtuse angles (alpha) are directly opposite.
4. Spray module (01) according to Claims 1 to 3, characterized in that with directly adjacent closing apertures (08, 09) and metering apertures (12, 13), the obtuse angle (alpha) of the inside (28, 60) of the closing aperture (08, 09) and the over-obtuse angle (beta) of the outside (45, 55) of the metering aperture (12, 13) in each case lie opposite.
5. Spray module (01) according to Claims 1 to 4, characterized in that the size-variable metering space (11) consists of a single metering aperture (12; 13) and a closing aperture (08; 09) at a distance from it, in that the metering aperture (12, 13) is angled at an obtuse angle (beta) and in that the inner side (22, 23) of the metering aperture (12; 13) with its obtuse angle lies opposite to the inner side of the closing apertures (08; 09).
6. Spray module (01) according to Claims 1 to 5, characterized in that the metering apertures (12, 13) consist of spring steel.
7. Spray module (01) according to Claims 1 to 6, characterized in that a drive (49) is provided for swivelling the metering apertures (12, 13).
8. Spray module (01) according to Claim 7, characterized in that an electromotive drive is provided as a drive (49).
9. Spray module (01) according to Claims 1 to 8, characterized in that a device (31) for aspirating leak moisture liquid is provided on the outer side of the end of the closing aperture (08, 09).
10. Spray module (01) according to Claims 1 to 9, characterized in that a number of damping unit spray modules (01) are combined to give a spray bar (42).
11. Spray module (01) according to Claims 1 to 10, characterized in that the closing apertures (08, 09) extends at least over the width of a spray module (01).
12. Spray module (01) according to Claims 1 to 11, characterized in that the closing apertures (08, 09) in each case extend at least over the width of a number of spray modules (01).
13. Spray module (01) according to Claims 10 to 12, characterized in that the closing apertures (08, 09) extend in one piece over the entire length of the spray bar (42).
14. Spray module (01) according to Claims 1 to 13, characterized in that the spray nozzle (04) is a flat jet nozzle.

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