EP2464518A1

EP2464518A1 - Rotary screen printing device and method

Info

Publication number: EP2464518A1
Application number: EP10747169A
Authority: EP
Inventors: Erhard Herbert GLÖCKNER
Original assignee: Zyrus Beteiligungs GmbH and Co Patente I KG
Current assignee: Zyrus Beteiligungs GmbH and Co Patente I KG
Priority date: 2009-08-14
Filing date: 2010-08-16
Publication date: 2012-06-20
Also published as: JP2013501646A; WO2011018243A1; DE102009037332A1; CN102625748A; US20120204744A1

Abstract

The invention relates to a rotary screen printing device, comprising a printing cylinder (6) rotatably mounted around a printing cylinder axis (10), the cylinder jacket of the printing cylinder being formed at least in certain areas by a printing screen (8), an impression cylinder (4) rotatably mounted around an impression cylinder axis (11), and a squeegee (17) that can be moved relative to the cylinder jacket of the printing cylinder (6) and is arranged at least partially inside the printing cylinder (6) for pressing printing ink through the printing screen (8) onto a substrate (2) to be imprinted. At least one adjustment device is provided for adjusting a distance (15) between the printing cylinder axis (10) and the impression cylinder axis (11) and/or a radius of the printing cylinder (6) and/or the impression cylinder (4).

Description

Rotary screen printing apparatus and method

description

The invention relates to a rotary screen printing apparatus comprising a rotatably mounted about a printing cylinder axis pressure cylinder whose cylinder jacket is at least partially formed by a printing screen, a rotatably mounted about a counter-pressure cylinder axis impression cylinder and a relative to

Cylinder jacket of the printing cylinder movable, at least partially disposed in the interior of the printing cylinder doctor blade for printing ink through the printing screen on a substrate to be printed. Furthermore, the invention relates to a use of a rotary screen printing apparatus and a rotary screen printing method.

In rotary screen printing machines, a filled printing ink is applied to the material to be printed via a rotating printing cylinder provided with a printing screen. In this case, a doctor arranged in the interior of the printing cylinder, usually not rotating with the printing cylinder squeegee pushes the ink through the rotation of the printing cylinder circumferentially through the mesh of the printing screen. The material to be printed is received by a likewise rotating counter-pressure roller. Often, the material to be printed is not in continuous webs, but in individual sheets, which must therefore be held during the printing process on the impression cylinder. For this purpose, provided in the prior art on the impression cylinder gripper bars are described (see, for example, DE 199 49 099 C2).

A generic rotary screen device, for example, the

DE 199 49 099 C2 or DE 102 32 254 B4.

EP 072 38 64 B1 describes a rotary screen printing machine for ground pressure with a forme cylinder carrying a screen printing stencil, a printing cylinder having at least one cylinder pit and forms the printing gap with the forme cylinder, and with a radially adjustable in the interior of the forme cylinder squeegee Area of the nip is installed and which is pressed during a printing operation against the inside of the screen stencil. The printing cylinder is provided in each cylinder pit with sheet grippers, which in its closed position, the printing

BESTATIGUNGSKOPIE Do not project beyond the surface of the printing cylinder. The adjustable squeegee and a squeegee-controlling adjusting mechanism are adapted to adjust the squeegee in a rest position lifted from the inside of the rotary screen stencil when the open area of a cylinder pit of the printing cylinder covers the area of the cylinder

Pressure gap happens.

EP 8 791 45 B1 shows a rotary screen printing machine for printing on goods or sheet-like material, wherein the rotary screen printing machine comprises a main frame on which at least one screen printing unit is mounted. These

Screen printing unit has a template, a stencil holder, a

Drive means which rotatably drives the stencil and a doctor blade and a blade suspension, a counter-pressure roller and a Druckpastenzuführsystem on. The stencil, the stencil holder, the squeegee, the squeegee and the

Print paste delivery systems are housed in a base that can be moved in a direction transverse to the main frame of the printing machine.

DE 102 322 54 B4 describes a rotary screen printing machine with a pressure cylinder rotatably mounted about a printing cylinder axis, whose cylinder jacket is at least partially formed by a printing screen. One inside the

Pressure roller arranged on a doctor blade holder, extending parallel to the printing cylinder axis squeegee presses on a paint container in

Rotation direction of the printing cylinder before the doctor supplied ink from the interior of the printing cylinder through the printing screen through on a material to be printed. In the direction of rotation in front of the squeegee is one with the paint container

connected, arranged parallel to the squeegee ink supply having a plurality of ink discharge openings, wherein the ink discharge openings

located directly in front of a squeegee tip facing the printing screen and via at least one control valve in response to a respective

Controlled rotation position of the printing screen, the ink release substantially point before the squeegee.

The rotary screen printing apparatuses according to the prior art are for

complicated, especially differently structured printed images comparatively poorly suited. Also the accuracy and reproducibility of the

Rotary screen printing devices according to the prior art is called

felt unsatisfactory. It is an object of the present invention to propose a rotary screen printing apparatus in which complicated and possibly differently structured printed images can be produced with high accuracy and / or comparatively high reproducibility. Preferably, it is also intended to enable high-speed printing and / or multiple printing. Further preferably should

Security features to be printable.

This object is achieved by a rotary screen printing apparatus according to claim 1 or a use according to claim 18 or a method according to claim 20 and / or 21.

In particular, the object is achieved by a rotary screen printing device having a rotatably mounted about a printing cylinder axis pressure cylinder whose

Cylinder jacket is at least partially formed by a printing screen, a rotatably mounted about a counter-pressure cylinder axis counter-pressure cylinder and a movable relative to the cylinder jacket of the printing cylinder, at least partially arranged in the interior of the printing cylinder doctor for printing ink through the printing screen to a substrate to be printed.

According to a first aspect, an adjusting device for adjusting a

Distance between the impression cylinder axis and the impression cylinder axis and / or for adjusting a radius of the impression cylinder and / or

Counter-pressure cylinder provided. As a result, for example, the printed image can be adapted to varying properties of the substrate, such as a previously printed printed image. By an adjustability of the distance between the impression cylinder axis and impression cylinder axis or the radius of the impression cylinder and / or impression cylinder, the effective scope of

Pressure cylinder and / or impression cylinder and in this way the printing length can be varied. This allows the printed image to be varied, allowing for more complex structures. Preferably, the distance between

Pressure cylinder axis and impression cylinder axis varies radially. Alternatively or additionally, however, the distance can also be varied tangentially. The adjustment of the distance or the radii can preferably be carried out continuously and / or in discrete steps. It is advantageous if the adjusting device (s) can be locked by a locking device (are). According to a second aspect, alternatively or additionally to the provision of an adjusting device for adjusting the distance, the impression cylinder may be at least partially made of rubber. Such a cylinder, for example, analogous to a blanket cylinder, as it is known from offset printing or gravure, be formed. In combination with the adjustment of the distance between

Pressure cylinder axis and counter-pressure cylinder axis can thus be particularly easily varied the effective extent or the print length, whereby the printed image can be changed.

As an alternative or in addition to providing an adjusting device for adjusting the distance, a control device for controlling the position and / or orientation and / or translational and / or rotational speed and / or geometric shape of the doctor blade is provided according to a third aspect of the invention. As a result, for example, only small areas of the printing screen can be crossed over, or several areas per revolution can be crossed over. In the prior art, a curve guide in the printing cylinder had to be replaced in each case, which has led to considerable conversion costs or to a loss of time.

Alternatively or in addition to providing an adjusting device for adjusting the distance according to a fourth aspect of the invention, the printing cylinder comprises a plurality of ink chambers, in particular for different colors, wherein the ink supply of at least one or each ink to be supplied preferably via a

electronic control is adjustable. Preferably, at least two doctor blades are provided or at least one doctor blade is divided into corresponding partial doctor blades. As a result, printing images arranged side by side in different printing colors can be printed with different colors.

Preferably, the ink supply via an electronic control in response to a color consumption is regulated. This can appropriate

Consumption be provided. The electronic control can be provided separately or by a central control unit of

Rotary screen printing device to be included. As a result, different print motifs can be produced depending on a single color.

In a preferred development, the rotary screen printing device is designed for printing on substrates with a plurality of printed images arranged next to one another. For controlling the position and / or orientation and / or translational and / or rotational speed and / or geometric shape of the doctor blade, at least one controllable drive can be formed. It can the

Control device in particular in a storage means, such as a memory chip or a magnetic memory (eg., Magnetic memory card), stored control programs for control. The controllable drive is preferably a linear drive.

Further preferably, the drive via a central

Rotary screen printer controller controllable and / or programmable.

The distance between the impression cylinder axis and impression cylinder axis can be manually adjustable, for example. Alternatively, the section can also

automatically, for example via a controller, in particular the central

Rotary screen printer device control, be adjustable. Also in this regard, provided on a storage means control programs can be used.

In a concrete embodiment of the invention is a gripper bar in the

Counter-pressure cylinder provided to fix the substrate to be printed and / or position. Furthermore, at least one electronically controllable actuator, in particular a microactuator, can be designed to adjust the positioning of the substrate for setting the registration and / or positioning of the printed image on the substrate, in particular during the printing process. The positioning can be done manually or automatically. By operating the microactuators during the printing operation, the registration and

Positioning of the printed image with very simple means also during the printing operation done.

In a preferred embodiment, the setting of the registration and / or positioning of the printed image on the substrate relative to a predetermined substrate edge and / or already printed printed images and / or to particular optoelectronic reference marks electronically, in particular by means of provided optoelectronic components such as photodiodes and / or CCD cameras and / or MOS cameras feasible. Preferably, the opto-electronic component (s) for analyzing the printed image on the substrate are in an outlet of the rotary screen printing apparatus

educated.

The task is solved independently by the use of a

Rotary screen printing apparatus, in particular of the type described above, for printing substrate sheets and / or roll-shaped substrates, wherein the

Substrate sheets / substrates by means of offset printing and / or gravure printing and / or flexographic printed substrate sheets / substrates are. Alternatively or additionally, a

Rotary screen device according to the invention are also used for printing with several sides arranged side by side.

The object is achieved independently by a method for printing on

Substrate sheets and / or roll-shaped substrates using a

Rotary screen printing machine, in particular of the type described above, wherein the substrate sheets / substrates by means of offset printing and / or gravure printing and / or flexographic printed substrate sheets and wherein a positioning of the rotary screen image, in particular during the printing process, in relation to the previously printed image of the offset printing and / or gravure printing and / or flexographic printing takes place.

Preferably also in this method, the positioning can be done by means of the optoelectronic components described above.

The object is achieved according to a further independent aspect by a method comprising the steps of providing a rotary screen printing apparatus comprising a rotatably mounted about a pressure cylinder axis pressure cylinder whose cylinder jacket is at least partially formed by a printing screen, a rotatably mounted about a counter-pressure cylinder axis impression cylinder and a relative to Cylinder jacket of the printing cylinder movable, at least partially disposed in the interior of the printing cylinder doctor blade for pressing ink through the printing screen to a substrate to be printed; and adjusting a distance between the impression cylinder axis and the impression cylinder axis, especially during operation. Such a method has in principle the same advantages as the rotary screen printing apparatus described above. Preferably, an impression cylinder is provided, which is at least partially made of rubber. The proportion of rubber, for example, 10% or

preferably 30%, more preferably 70%, in particular 90%.

In a specific embodiment of the method, the position and / or orientation and / or translational and / or rotational speed and / or geometric shape of the doctor blade are controlled as a function of specifications and / or previously measured parameters of the substrate. A control as a function of an already previously applied print image on the substrate is also conceivable. By such a method, a component for varying the printed image is used in the form of the doctor blade, which is already elementary part of a

Rotary screen printing machine is. As a result, the variability of the method can be increased without further components by simple means.

Preferably, a control device for controlling the position and / or orientation and / or translational and / or rotational speed and / or geometric shape of the doctor blade is programmed. In a preferred

Embodiment, the ink supply of at least one or each color to be supplied is controlled electronically and optionally programmed an electronic control accordingly.

In a specific embodiment, the ink supply is regulated as a function of a color consumption.

Preferably, the distance between the impression cylinder axis and

Counter-pressure cylinder axis, especially during operation or pressure, manually adjusted. Alternatively, the distance can also be adjusted automatically, in particular by a control device or the central rotary screen pressure control device.

Further embodiments emerge from the subclaims.

The invention will also be described in terms of further features and advantages based on embodiments, which are explained in more detail with reference to the drawings.

Hereby show: FIG. 1 shows a rotary screen printing machine in a schematic side view according to the prior art; FIG.

- Fig. 2 is a printing cylinder and a counter-pressure cylinder of

Rotary screen printing apparatus according to the prior art in a schematic view;

- Fig. 3 is a printing cylinder and impression cylinder of an inventive

Rotary screen printing machine in a first position in a schematic view;

4 shows a printing cylinder and counter-pressure cylinder according to FIG. 3 in a second position in a schematic view;

FIG. 5 is a schematic view of a pressure cylinder according to a preferred embodiment; FIG. and

6 shows a section of the printing cylinder from FIG. 5 along the section line

VI-VI in schematic view.

In the following description, the same reference numerals are used for the same and like parts.

The prior art rotary screen printing apparatus described by FIGS. 1 and 2 can in principle be the basis of the invention

Rotary screen printing device, with additions and deviations in

Explained below.

The rotary screen printing apparatus illustrated in FIG. 1 is designed for printing on a single-sheet substrate 2 to be printed in a magazine 1. The path of the substrates 2 (in the present case, the substrate is concretely formed in the form of individual sheets) by the rotary screen printing apparatus is indicated by arrows. First, the substrates 2 arrive one after the other via a feed device 3 to a rotating impression cylinder 4. This has a gripper bar 5 shown in FIG. 2, with which the substrate 2 is clamped on the impression cylinder 4. While the rotation acts on the Substrate 2, a likewise rotating pressure cylinder 6, which at a

Machine frame 7 is mounted. After printing, the gripper bar 5 releases the now printed substrate 2 again and this is during its further

Dried by the rotary screen printing device and finally fed to a further processing or sorting.

Fig. 2 shows how a printing screen 8 under the action of the gripper bar 5 of the

Counter-pressure cylinder 4 is deformed during the successive unwinding of pressure cylinder 6 and impression cylinder 4. The illustration in Fig. 2 is only schematic and also corresponds herichtlich the arrangement of the printing cylinder 6 and the

Impression cylinder 4 not Fig. 1.

A squeegee may preferably be designed as in DE 199 49 099 C2 and cooperate with the corresponding rotary screen printing device, as described in particular with reference to FIGS. 3 to 5 of DE 199 49 099 C2.

Fig. 3 shows a printing cylinder 6 which is rotatably mounted about a printing cylinder axis 10, and a counter-pressure cylinder 4, which is mounted rotatably about a counter-pressure cylinder axis 11. The impression cylinder 6 and the impression cylinder 4 rotate in opposite directions in the direction of the arrows 12 and 13.

An adjusting device 14 is provided, which makes it possible to set a distance 15 between impression cylinder axis 10 and impression cylinder axis 11. For example only, the adjusting device 14 may be constructed telescopically. An adjustment can be done manually, hydraulically or by electric drive. Preferably, an adjustment is electronically controllable, wherein a (not shown) control device can be programmed accordingly. Preferably, for this purpose, a central control unit is provided, which has one or more

Rotary screen printing controls accordingly. For example, this can also be done over a network, such as the Internet or an intranet. The control can be wired or wireless, for example by means of infrared or radio.

Fig. 4 shows the impression cylinder 6 and impression cylinder 4 of FIG. 3, but with the corresponding distance 15 between impression cylinder axis 10 and

Counter-pressure cylinder axis 11 is shortened. As a result, printing cylinder 6 and / or impression cylinder 4 are deformed accordingly, so that increases the print length. In addition, the contact pressure of pressure cylinder 6 and impression cylinder changes 4 on the substrate (not shown). It is thus created a way to achieve a simple variation of the printed image.

The variation of the distance 15 can be done, for example, continuously or discretely. It is advantageous if the adjusting device can be locked accordingly by a locking device. Thus, for example, be provided that the locking device allows locking in at least 10, preferably at least 100 discrete locking positions. Preferably, the distance can be controlled by the control device (not shown in the figures), whereby parameters of the substrate or measured values obtained during pressing by corresponding measuring devices (not shown) are used to control the distance 15.

Fig. 5 shows the printing cylinder 6 in a preferred embodiment in a schematic view. Inside the printing cylinder 6 is a

cylindrical doctor blade receptacle 16, on which a doctor blade 17 is arranged, which (as shown in FIG. 6) is divided into three partial doctor blades 17a, 17b and 17c. FIG. 6 shows a section through the pressure cylinder 6 from FIG. 5 along the section line VI-VI.

FIG. 5 also shows a color feeder 18 which applies printing ink to the inner wall of the printing cylinder 6 (or a printing screen, not shown) from a color chamber 19. Overall, preferably three (or two or

generally a variety of; not in the figures) separate color chambers 19 and corresponding ink feeds 18 provided (not shown in the figures). The ink supply can be electronically controlled by a central controller or a separate controller. By providing several doctor blades, several printed images arranged side by side can be printed with different colors. Corresponding measuring units (not shown) can be provided which measure the ink consumption and accordingly control the ink supply electronically via a controller.

Preferably, the doctor blade 17 or, if appropriate, the partial doctor blade 17a to 17c can each be moved translationally and / or radially separately by a control or the central control, this being particularly advantageous during the printing operation. Such a possibility for displacement is also advantageous when a doctor blade 17 which is not subdivided into partial doctor blades is provided. Again, it is conceivable that a shift takes place continuously and / or discretely. It can be provided corresponding locking means (not shown in the figures). By an axial displacement, for example, only small areas in the printing cylinder can be berakelt.

Preferably, the doctor blade 17 or the doctor blade holder 16 is not rigidly but rotatably mounted so that several surfaces per revolution of the printing cylinder 6 can be berakelt.

It should be noted at this point that all the above-described parts taken alone and in any combination, in particular the details shown in the drawings, are claimed as essential to the invention. Variations thereof are familiar to the person skilled in the art.

LIST OF REFERENCE NUMBERS

magazine

substratum

feeding

Impression cylinder

gripper bar

pressure cylinder

machine frame

printing screen

Pressure cylinder axis

Impression cylinder axis

arrow

adjustment

distance

P.akelauf take

doctor

a-c part squeegee

ink supply

ink chamber

Claims

Rotary screen printing apparatus and method Claims

A rotary screen printing apparatus comprising

- A rotatably about a pressure cylinder axis (10) mounted pressure cylinder (6) whose cylinder jacket is at least partially formed by a pressure screen (8);

- A rotatably mounted around a counter-pressure cylinder axis (11)

Impression cylinder (4) and

a movable one relative to the cylinder jacket of the printing cylinder (6),

at least partially in the interior of the printing cylinder (6) arranged doctor blade (17) for pressing ink through the printing screen (8) on a substrate to be printed (2) g eke n nzeich net you rch at least one adjusting device for adjusting a distance (15) between the printing cylinder axis (10) and the impression cylinder axis (11) and / or a radius of the impression cylinder (6) and / or the impression cylinder (4).

2. rotary screen printing apparatus according to claim 1,

there are signs that that

the impression cylinder (4) is at least partially made of rubber.

3. rotary screen printing apparatus according to any one of claims 1 or 2,

marked by

a control device for controlling the position and / or orientation and / or translational and / or rotational speed and / or geometric shape of the doctor blade (17).

4. Rotary screen printing device according to one of the preceding claims, da u rchken draws that

the printing cylinder (6) a plurality of ink chambers (19), in particular for

different colors, wherein a color supply (18) for at least one or each of the supplied colors is preferably controlled by an electronic control.

5. Rotary screen printing device according to one of the preceding claims, in particular according to claim 4,

there are signs that that

at least two doctor blades (17, 17a to 17c) are provided.

6. rotary screen printing apparatus according to any one of claims 4 or 5,

dad u rch nets that net

the ink supply (18) via an electronic control in response to a color consumption is regulated.

7. Rotary screen printing device according to one of the preceding claims, in particular according to one of claims 4 to 6,

dad u rch n zei c h net ,, that

the rotary screen printing apparatus for printing substrates (2) is formed with a plurality of juxtaposed printed images.

8. rotary screen printing apparatus according to claim 3,

there is no sign that

for controlling at least one controllable drive is formed.

9. rotary screen printing apparatus according to any one of claims 3 or 8,

That means that

the control device comprises control programs for the control.

10. rotary screen printing apparatus according to any one of claims 8 or 9,

d ad u rc h geken nzeich net that

the drive is a linear drive.

11. rotary screen printing apparatus according to any one of claims 8 to 10,

dad u rch net that net the drive is controllable and / or programmable via a central controller.

12. rotary screen printing apparatus according to claim 1,

dad u rch g ekennzeich net that

the distance (15) is manually adjustable.

13. rotary screen printing apparatus according to any one of claims 1 or 12,

dad u rch geken nzeich n et that

the distance (15) is automatically adjustable, in particular by a preferably central control.

14. Rotary screen printing device according to one of the preceding claims,

dad u rch marked that

a gripper bar (5) on the impression cylinder (4) is provided to the

To fix substrate (2) and / or position.

15. Rotary screen printing device according to one of the preceding claims,

dad u rch g e n n n et that

at least one electronically controllable actuator, in particular microactuator is designed for adjusting the positioning of the substrate (2) for

Setting the registration and / or positioning of the printed image on the substrate (2), in particular during the printing process.

16. Rotary screen printing apparatus according to claim 15,

dad u rch gken nzeich n et that

the setting of the registration and / or positioning of the printed image on the substrate (2) relative to a predetermined substrate edge and / or at least one already printed print image and / or to particular opto-electronic reference marks electronically, in particular by means of provided optoelectronic components such as photodiodes and / or CCD - Cameras and / or CMOS cameras is feasible.

17. Rotary screen printing apparatus according to claim 16,

dad u rch net that net

the optoelectronic components for analyzing the printed image on the substrate (2) are formed in an outlet of the rotary screen printing machine.

18. Use of a rotary screen printing machine, in particular according to one of the preceding claims for the printing of substrate sheets and / or roll-shaped substrates, wherein the substrate sheets / substrates by means of offset printing and / or gravure printing and / or flexographic printed substrate sheets are.

19. Use according to claim 18,

marked by

the further use for printing with a plurality of juxtaposed substrate sheets.

20. Method using a rotary screen printing apparatus, in particular according to one of claims 1 to 17 for the printing of substrate sheets and / or roll-shaped substrates, wherein the substrate sheets / substrates by means of

Offset printing and / or gravure printing and / or flexographic printed substrate sheets are.

21. Rotary screen printing method, in particular according to claim 20, preferably using the rotary screen printing apparatus according to one of

Claims 1 to 17, comprising the steps:

- Providing a rotatably mounted about a pressure cylinder axis (10)

Pressure cylinder (6) whose cylinder jacket is at least partially formed by a pressure screen (8);

Providing a rotatable about an impression cylinder axis (11)

mounted impression cylinder (4);

- Providing a relative to the cylinder jacket of the impression cylinder (6)

movable, at least partially inside the impression cylinder

arranged doctor blade (17) for pressing ink through the printing screen on a substrate to be printed (2).

- Adjusting a distance (15) between the impression cylinder axis (10) and the impression cylinder axis (11), in particular during the printing operation.

22. The rotary screen printing method according to claim 21,

characterized in that the squeegee depending on specifications and / or previously measured

Parameters of the substrate (2) with respect to their position and / or orientation and / or translational and / or rotational speed and / or geometric shape is controlled.

23. The method according to claim 21 or 22,

dad u rch n that net

a color feeder (18) is controlled via an electronic control in dependence on a color consumption.

24. Rotary screen printing method according to any one of claims 21 to 23,

That is why

the distance (15) is adjusted manually.

25. Rotary screen printing method according to any one of claims 21 to 24,

characterized in that

the distance (15) automatically, in particular by a central

Control device is adjusted.