EP1250227B1 - Inking device - Google Patents

Abstract

An inking device is used to ink a cylinder or a roller of an intaglio printing inking unit. A doctor blade device is located in the vicinity of the ink level of the printing ink in an ink trough of the ink application device. The ink trough, the doctor blade device and the cylinder or roller to be inked can be heated. This allows the use of solvent-free printing inks at temperatures in the range of 100° C.

Description

The invention relates to a paint application device according to the preamble of Claim 1.

A rotogravure inking unit has become known from EP 655 328 B1 Squeegee device is arranged at a distance from the ink fountain and just before the printing zone to prevent premature drying of the solvent-based ink.

DE 93 10 680 U1 describes a device for setting the temperature of a Printing ink in the inking unit of a printing press. One against a roller Doctor device is not provided.

WO 98/50233 A shows an intaglio inking unit in which a doctor blade is below a through the axis of rotation of the forme cylinder is arranged horizontals.

DE 197 36 339 A1 describes a temperature control device for an anilox roller a squeegee.

DE 42 05 713 C2 discloses an intaglio printing ink that prints in the heated state and dries by cooling.

The invention has for its object a paint application device for To create form cylinders for gravure, with which printing inks are printable, their Working temperature is above ambient temperature.

The object is achieved by the features of claim 1.

The advantages that can be achieved with the invention are in particular that
the ink is scraped off the roller or from the forme cylinder in the immediate vicinity of the ink level in the ink tray. This results in a low drop height of the printing ink scraped off the roller to be inked. Damage caused by splashes when the scraped-off printing ink hits the ink fountain is thus kept to a minimum and any color foam which otherwise arises is avoided, so that there is no soiling of the inking unit.

As a result of a presettable temperature of the printing ink, it is also possible to use so-called Hot-Tec printing inks for gravure use - see DE 42 05 713 C2 - which at a temperature of approx. 100 to 110 ° C solvent-free on the substrate be applied.

Through a compact arrangement of the hot-tec printing ink in contact coming parts of the inking unit, there is only a slight loss of heat.

An embodiment of the invention is shown in the drawing and is in following described in more detail.

Fig. 1

einen Querschnitt durch eine Farbauftrageinrichtung in Ruhestellung;

Fig. 2

eine Draufsicht auf die Farbauftrageinrichtung nach Fig. 1 in einer Teildarstellung, ohne Formzylinder.

Show it:

Fig. 1

a cross section through a paint application device in the rest position;

Fig. 2

a plan view of the ink application device according to FIG. 1 in a partial representation, without forme cylinder.

A color application device 01 for printing ink 02 of an inking unit Rotary printing machine consists of an ink tray that receives ink 02 03, which is on both sides on end plates 04; 06 is attached. Appropriately, the ink tray 03 consists of a double-walled container, i.e. H. from an inner and an outer container 07; 08, between which a cavity 09 for receiving temperable liquid, e.g. B. heat transfer oil is provided.

The inner container 07 is provided with an ink supply and a color return line 11; 12 and the outer container 08 is with a bath liquid inlet and with a Bath fluid return line 13; 14 provided. By arranging the Color return line 12 at a predetermined height, the color level becomes constant held.

An application device, eg. Legs Ink roller 16, which with its axle 17 on both sides on pivotable Levers 18 is mounted. The levers 18 are in turn non-rotatable on one through the end plate 04; 06 guided shaft 19 attached. The shaft 19 is outside the end plates 04; 06 non-rotatably connected to a lever 21, which in each case by means of a Working cylinder 22 in a rest position (Fig. 1) or in a not shown Operating position is pivotable.

A squeegee device 23 also arranged in the ink tray 03 consists, for. B. from a cylindrical doctor blade carrier 24, which is a tangential extending to the lateral surface 26 of the doctor blade carrier 24 and in axially parallel Direction extending terminal block 27, in which a doctor blade 28, z. B. from Spring steel, is held. The clamping bar 27 is fixed on the doctor blade carrier 24 arranged.

The doctor blade carrier 24 is by means of the end plates 04; 06 guided Axle journal 29 outside the end plates 04; 06 rotatably via a lever arm 30 with a piston rod of a working cylinder 31 connected. When pressing the Working cylinder 31, the doctor blade carrier 24 rotates, so that the doctor blade 28 on a lateral surface 32 of a roller to be inked, e.g. B. a forme cylinder 33 for Gravure printing or an anilox roller provided with recesses can be adjusted. The roller or the forme cylinder 33 can be tempered at least on its outer surface 32 educated.

The squeegee device 23 is arranged with respect to the roller or the forme cylinder 33 such that a contact line 46 generated by means of the working edge 44 of the doctor knife 28 in the working position on the lateral surface 32 of the forme cylinder 33 below a horizontal line 48 running through the axis of rotation 47 of the forme cylinder 33 Angular range from 40 ° to 70 °, preferably - + _α from 50 ° to 60 °, in particular from 55 °, to the horizontal 48.

A color level 34 in the ink pan 03 is dimensioned so that both the Ink roller 16 and the doctor device 23 in its rest position almost from Ink 03 are covered. The terminal block 27 is at least partially of printing ink lapped.

The end plates 04; 06 are each with racks 36; 37 positively connected. The Racks 36; 37 are in side frame fixed guides 38; 39 slidably mounted. On a drive shaft 41 arranged pinions are with the toothing Racks 36; 37 engaged.

The drive shaft 41 is mounted via a clutch 42 with a side frame fixed Stepper motor 43 connected. A counting device, not shown, serves as a display for current height setting of the ink tray 03 to the forme cylinder 33. The roller or the Forme cylinder 33 is exchangeable and can have diameters of different sizes.

According to an embodiment variant, it is possible to heat the doctor blade 28 separately. That can e.g. B. happen that the terminal block 27 near the clamped part of the doctor blade 28 separately heated, for. B. electrically heated is trained.

It is also possible for the doctor blade 28 to be heated separately, one at the edge of the inner container 07 located and extending in the axis-parallel direction To arrange induction coil.

In the gravure printing process, one acting against the forme cylinder 33, not shown Counter pressure cylinder can be arranged. The assumed direction of rotation of the forme cylinder 33 runs counterclockwise. The direction of rotation can also be clockwise run. For this purpose, however, the inking roller 16 and the doctor device would be in their Swap page arrangement.

The ink application device works as follows: The ink tray 03 is actuated by means 36 to 39 and 43 move vertically in the direction of the forme cylinder 33 and its diameter customized. Preheated ink 02, approximately in the temperature range between 60 ° C to 180 ° C, preferably between 100 ° C and 110 ° C is filled into the inner container 07. The between the inner and outer container 07; 08 cavity 09 is with temperature-controlled thermal oil of analog temperature.

The thermal oil can be tempered both outside and inside the cavity 09 become.

Both the inking roller 16 and the doctor blade 28 can now during the Working position on the outer surface 32 of the forme cylinder 33 are made.

After the printing process has ended, printing ink 02 remains tempered until at the beginning of the next printing process.

It is of course also possible to work with solvent-based printing inks.

LIST OF REFERENCE NUMBERS

01

Inking device

02

printing ink

03

paint tray

04

End plate (01)

05

-

06

End plate (01)

07

Inner container (03)

08

Outer container (03)

09

Cavity (07; 08)

10

-

11

Color supply line

12

Color return line

13

Temperierflüssigkeits-supply line

14

Temperierflüssigkeits return line

15

-

16

inking

17

Journal (16)

18

Lever (16)

19

Shaft (04; 06)

20

-

21

Lever (16)

22

Working cylinder (16)

23

doctor device

24

Doctor knife carrier (23)

25

-

26

Lateral surface (24)

27

Terminal strip (28)

28

Doctor Knife (23)

29

Axle journal (24)

30

Lifting arm (29)

31

Working cylinder (23)

32

Lateral surface (33)

33

Forme cylinder, roller

34

Color level (02)

35

-

36

rack

37

rack

38

Leadership (36)

39

Leadership (37)

40

-

41

drive shaft

42

clutch

43

stepper motor

44

Working edge (28)

45

-

46

Contact line (44; 33)

47

Rotation axis (33)

48

Horizontal (47)

+

_α angle (48; 47)

-

_α angle (48; 47)

Claims (16)

1. Inking device for printing ink (02) on a roll or a forme cylinder (33) for gravure printing in a rotary press having an ink trough (03) and a doctor device (23) bearing on the roll or forme cylinder (33), the printing ink in the ink trough (03) having an operating temperature higher than ambient temperature, characterized in that at least parts (24; 27) of the doctor device (23) are designed such that they can be heated, in that a line of contact (46) of a doctor blade (28) belonging to the doctor device (23) runs below a horizontal line running through the axis of rotation (47) of the roll or forme cylinder (33), and in that the surface of a doctor blade carrier (24) is located below a preset ink level (34) of the printing ink (02) in the ink trough (03).
2. Inking device according to Claim 1, characterized in that the doctor device (23) comprises a rotatable doctor blade carrier (24) and a clamping strip (27) firmly arranged on the latter in order to clamp the doctor blade (28) firmly.
3. Inking device according to Claim 2, characterized in that the surface of the clamping strip (27) is located at least partly below the preset ink level (34) of the printing ink (02) in the ink trough (03).
4. Inking device according to Claims 1 and 3, characterized in that the ink trough (03) is constructed as a double-walled container (07; 08), that is to say from an inner and an outer container.
5. Inking device according to Claim 4, characterized in that a cavity (09) between the containers (07; 08) can be filled with a liquid whose temperature can be controlled.
6. Inking device according to Claims 1 and 3, characterized in that the ink level (34) of the printing ink (02) is kept constant by the arrangement of an ink feed line (11) and by an ink return line (12) arranged at the level of the ink level (34).
7. Inking device according to Claims 1 and 2, characterized in that at least the doctor blade (28) of the doctor blade carrier (24) can be heated by means of a separate heater.
8. Inking device according to Claim 7, characterized in that the heater is constructed as an induction heater.
9. Inking device according to Claim 1, characterized in that the roll (33) can have its temperature controlled, at least at its circumferential surface (32).
10. Inking device according to Claim 1, characterized in that the line of contact (46) of the doctor blade (28) on the forme cylinder (33) runs in the angular range +-α of 50° to 60° to the horizontal line (48).
11. Inking device according to Claim 1, characterized in that the forme cylinder (33) can have its temperature controlled, at least at its circumferential surface (32).
12. Inking device according to Claim 1, characterized in that the applicator device comprises an inking roll (16).
13. Inking device according to Claim 1, characterized in that the doctor blade (28) can be set against the roll (33) by means of actuating members (29; 30; 31).
14. Inking device according to Claim 12, characterized in that the inking roll (16) can be set against the roll (33) by means of actuating members (18; 19; 21; 22).
15. Inking device according to Claim 1, characterized in that the preheated printing ink flows around at least parts of the doctor device (23).
16. Inking device according to Claim 1, characterized in that the printing ink (02) in the ink trough (03) has a working temperature of 60° to 180°C.

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