EP3569416B1 - Racle pour une machine de sérigraphie - Google Patents
Racle pour une machine de sérigraphie Download PDFInfo
- Publication number
- EP3569416B1 EP3569416B1 EP19000229.5A EP19000229A EP3569416B1 EP 3569416 B1 EP3569416 B1 EP 3569416B1 EP 19000229 A EP19000229 A EP 19000229A EP 3569416 B1 EP3569416 B1 EP 3569416B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- squeegee
- screen
- individual short
- individual
- doctor blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007650 screen-printing Methods 0.000 title claims description 15
- 238000007639 printing Methods 0.000 claims description 23
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 6
- 238000010022 rotary screen printing Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000003973 paint Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 229920001821 foam rubber Polymers 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
- B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/44—Squeegees or doctors
- B41F15/46—Squeegees or doctors with two or more operative parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/22—Inking arrangements or devices for inking from interior of cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0804—Machines for printing sheets
- B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0831—Machines for printing webs
- B41F15/0836—Machines for printing webs by means of cylindrical screens or screens in the form of endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2231/00—Inking devices; Recovering printing ink
- B41P2231/12—Axially segmented ink blades
Definitions
- the invention relates to a screen printing machine with a cylindrical cylinder mold and a doctor blade arranged in the cylinder mold.
- a screen printing machine with a rotary screen printing cylinder and a corresponding method for printing a substrate in the rotary screen printing process and a doctor blade for use in the rotary screen printing cylinder and in the method are known.
- the doctor blade is arranged in the rotary screen printing cylinder in such a way that it essentially only sweeps over the inner circumferential surface of the cylindrical hollow body in the areas of the printing screen areas.
- the doctor blade preferably comprises a plurality of doctor blades which are arranged at a distance from one another in such a way that they essentially only sweep over the printing screen areas.
- the correct setting of the squeegee pressure is essential in screen printing, i.e. the mechanical pressure with which the squeegee presses against the inside of the cylinder mold.
- the squeegee pressure is only set with two adjusting screws on the left and right of the printing machine.
- the squeegee pressure on the outside of the cylinder mold is rather high because the frame of the screen guide is also located there, but the squeegee pressure remains rather low in the middle of the cylinder mold because the screen tension and squeegee pressure drop there.
- the invention is therefore based on the object of developing a generic screen printing machine in such a way that the disadvantages of the prior art are eliminated and the squeegee pressure on the cylinder mold can be adjusted over the entire width of the cylinder mold.
- the squeegee is divided into several individual short squeegees or single squeegees, the individual short squeegees each covering only one area to be printed of a certain squeegee or printing width and their distance from the inside of the cylinder mold transversely to the direction of rotation of the cylinder mold is individually adjustable.
- the adjustability of individual doctor blades according to the invention particularly preferably enables an improvement in the service life or service life of a cylinder mold through a more uniform mechanical load on the cylinder mold.
- the squeegee or printing width is preferably up to 5 cm, the squeegee width or printing width also being different or different sizes depending on the printing area, for example more than 5 cm, and the squeegee being divided into different or different Numbers of individual doctor blades are possible.
- the squeegee can therefore also be divided into individual squeegees, with each individual squeegee having a different width and being adapted to the particular conditions in the screen.
- the setting of the position of the respective individual short squeegees takes place from outside the screen or from the outside and can thus take place during operation of the screen printing machine.
- the squeegee pressure can particularly preferably be varied and adapted accordingly as a function of the print image produced during the printing process.
- the basic setting is first made using the left and right infeed of the overall squeegee until the outer tracks produce a good print image, and then the squeegee pressure of the further inner tracks is optimized by means of individual infeed.
- the relationships between the middle and outer tracks are exactly the opposite, which in this case also reverses the procedure.
- the setting of the individual short squeegees or individual squeegees can be done manually by means of axles deflected with toothed wheels, which are guided to the left and right of the screen opening for adjustment, or via flexible shafts guided outwards by each individual squeegee.
- the setting can also take place via a wedge system in which the distance between a single doctor blade, which is obliquely or conically shaped at its rear edge, and the cylinder mold is adjusted with the aid of a displaceable wedge.
- each individual doctor blade preferably has its own wedge.
- the respective wedge is particularly preferably displaced by means of piezoelectric or pneumatic actuators or with the aid of a spindle or threaded rod that is driven or set in rotation mechanically or by an electric motor.
- a single squeegee is closed as far as possible around the single squeegee according to a further preferred embodiment, so that hardly any color can leave the system, except via the screen contact with the printed product.
- the individual squeegee is preferably closed at its outer edges with strips of felt or elastomer, these strips forming a kind of counter-shape to the cylinder mold, and closed at the top by a cover made of felt or elastomer. Complete separation of the individual doctor blades by means of elastomer or foam rubber rings glued into the screen is also possible.
- This procedure is similar to a chambered doctor blade system and is therefore also referred to as a quasi-chambered doctor blade, in which, however, the doctor blade slightly lifts off the channels of the printing cylinder twice per revolution.
- a squeegee position according to the invention in the horizontal position or slightly above it, however, the undesired leakage of printing ink in the channel area can largely be avoided, because a slight downward inclination of the squeegee causes the ink to flow backwards from gravity or not much ink to the outside occurs.
- the squeegee can be provided with a shutter or closure which prevents paint from flowing out when the squeegee is lifted off the screen.
- This shutter preferably a thin metal or plastic leaflet, closes the remaining gap of the quasi-chambered doctor blade only during the brief lifting of the doctor blade, preferably by moving it from above towards the edge of the doctor blade. This movement can be carried out either mechanically via a pressure curve (similar to the control of a gripper) or electromechanically by means of a motor or lifting magnet and triggering synchronously with the corresponding cylinder circumferential position.
- each individual short squeegee i.e. the angle of incidence of the squeegee on the cylinder mold, and / or the height of each individual short doctor knife, i.e. a displacement parallel to the inside of the cylinder mold but transversely to the longitudinal axis (which is also changed the angle of the doctor blade on the cylinder mold), is adjustable. This improves the print quality, screen life and ink flow even further.
- angles of incidence of the doctor blade of 45 ° to 135 °, preferably of 90 ° ⁇ 15 ° are usual, the angle of incidence, as is known, determining the edge sharpness and influencing the application of paint.
- a squeegee angle of 90 ° means that the squeegee is aligned perpendicular to the screen surface.
- the height of each individual short doctor blade is preferably adjusted by ⁇ 10 mm in each case.
- the individual doctor blades according to the invention are preferably attached to a doctor blade holder in such a way that they can be laterally displaced and adjusted before the overall doctor blade is installed in the printing machine, so that the respectively desired printing position is achieved transversely to the printing direction.
- the device according to the invention and the method for setting the squeegee pressure can in principle also be used for other printing processes which have a squeegee and are of course suitable for any printing applications also outside of banknote printing.
- Possible further areas of application are, for example, the NotaProtector® coating machine from KBA NotaSys, flexographic printing units with chamber doctor blades and inking units for offset printing or indirect letterpress printing.
- Fig. 1 shows a schematic section of a cylinder mold printing machine consisting of a cylinder mold 1 and a squeegee 2 made of an elastic plastic material or elastomer, the squeegee 2 being clamped between a base body 3 and a cover plate 4, which are made of aluminum, for example.
- a color bead 5 is formed above the doctor blade 2 due to the damming up of the ink.
- the doctor blade 2 can also be designed as a system doctor blade, which consists of two components.
- One component consists of a hard-elastic carrier, for example a glass fiber reinforced plastic profile, which ensures a constant squeegee angle and squeegee pressure as well as constant flexibility.
- the carrier is with a soft elastic strip or one Elastomer profile, for example made of polyurethane with a Shore hardness of 55 ° to 85 °, is permanently connected as a pressure edge that is in contact with the screen.
- Such system doctor blades are manufactured, for example, by RK Siebdrucktechnik GmbH (RKS®).
- the RKS system doctor blade type 32 HQ has a GRP plastic profile with a height of 50 mm to 115 mm and a thickness of 2.5 mm and an elastomer profile with a thickness of 6 mm to 8 mm and a Shore hardness of 55 °, 65 ° or 75 °.
- the length of this RKS system doctor blade can be up to 2600 mm.
- Fig. 2 shows a cylinder mold printing machine in which a doctor blade is divided into six individual doctor blades 2.1 to 2.6 which are arranged parallel to the longitudinal axis of the cylinder mold 1.
- Each individual doctor blade 2.1 to 2.6 can each move in the direction of the in Fig. 2 shown double arrows are moved perpendicular to the cylinder mold or away from it.
- This means that each individual doctor blade 2.1 to 2.6 can be set independently of the other individual doctor blades in such a way that it rests against the surface of the cylinder mold 1 on the inside of the cylinder mold 1. Different or changing diameters of the cylinder mold in the longitudinal axis can thus be compensated for.
- Fig. 3 shows the squeegee off Fig. 1 , at which its angle in the direction of the double arrow 7, i.e. the angle of incidence of the doctor blade 2 on the cylinder mold, and / or its height in the direction of the double arrow 8, i.e. a displacement parallel to the inside of the cylinder mold but transversely to the longitudinal axis (which is also the angle of incidence of the doctor blade 2 changed to the cylinder mold), is adjustable. This improves the print quality, screen life and ink flow even further.
- the various setting options for the squeegee angle can prevent too much ink from flowing into the screen or from running off the squeegee on the gripper channels when the squeegee is lifted off.
- Fig. 4 shows an infeed of a doctor blade 2 according to a single doctor blade Fig. 2 to the inside of the cylinder mold via a wedge system.
- the doctor blade 2 is beveled at the rear edge which is opposite the front edge which rests against the cylinder mold.
- a wedge 9 is arranged on the beveled rear edge of the doctor blade 2. If the wedge 9 is moved in the direction of the arrow 10 by means of a rotatable spindle or threaded rod 11 forwards (upwards in the figure) and back (downwards in the figure), the doctor blade 2 is moved towards or away from the cylinder mold in the direction of the arrow 12 moved him away.
- the rotatable spindle or threaded rod 11 is guided in a frame 13 and rotated, for example, by an electric motor (not shown) with a torque of 0.35 Nm.
- the doctor blade 2 has a thickness of 14 mm at its front edge and a mean width (center between the upper edge and lower edge) of 45 mm.
- the wedge 9 is 15 mm wide at its narrow upper edge and 25 mm wide at its wide lower edge.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Screen Printers (AREA)
Claims (5)
- Machine d'impression sérigraphique comprenant un tamis rond (1) de forme cylindrique et une raclette (2) disposée à l'intérieur du tamis rond (1), caractérisée en ce que la raclette est divisée en plusieurs courtes raclettes (2.1-2.6) individuelles, les courtes raclettes (2.1-2.6) individuelles ne recouvrant respectivement qu'une zone à imprimer ayant une largeur de raclette ou d'impression déterminée, de préférence jusqu'à 5 cm, et l'écart des courtes raclettes (2.1-2.6) individuelles entre le côté intérieur du tamis rond (1) transversalement par rapport au sens de rotation du tamis rond étant réglable individuellement, de sorte que l'écart entre chaque courte raclette (2.1-2.6) individuelle et le tamis rond (1) peut être réglé différemment en fonction de l'arrangement respectif dans le tamis rond.
- Machine d'impression sérigraphique selon la revendication 1, caractérisée en ce que le réglage de la position des courtes raclettes (2.1-2.6) individuelles respectives s'effectue depuis en-dehors du tamis ou depuis l'extérieur.
- Machine d'impression sérigraphique selon la revendication 2, caractérisée en ce que le réglage de la position des courtes raclettes individuelles respectives s'effectue manuellement par des axes renvoyés par des roues dentées, qui sont guidés à gauche et à droite au niveau de l'ouverture du tamis en vue du réglage, ou par le biais d'arbres flexibles amenés vers l'extérieur depuis chaque courte raclette (2.1-2.6) individuelle.
- Machine d'impression sérigraphique selon l'une des revendications précédentes, caractérisée en ce que le réglage des courtes raclettes (2.1-2.6) individuelles s'effectue par le biais d'un système de clavettes avec lequel l'écart entre une raclette individuelle (2.1-2.6), dont le bord arrière est façonné biseauté ou conique, et le tamis rond (1) est réglé à l'aide d'une clavette coulissante (9).
- Machine d'impression sérigraphique selon l'une des revendications précédentes, caractérisée en ce que l'angle de chaque courte raclette (2.1-2.6) individuelle, c'est-à-dire l'angle d'approche de la raclette vers le tamis rond (1), et/ou la hauteur de chaque courte raclette (2.1-2.6) individuelle, c'est-à-dire un décalage parallèle au côté intérieur du tamis rond (1) mais transversal à l'axe longitudinal, est réglable.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018003919.7A DE102018003919A1 (de) | 2018-05-16 | 2018-05-16 | Rakel für eine Siebdruckmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3569416A1 EP3569416A1 (fr) | 2019-11-20 |
EP3569416B1 true EP3569416B1 (fr) | 2021-07-07 |
Family
ID=66554096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19000229.5A Active EP3569416B1 (fr) | 2018-05-16 | 2019-05-13 | Racle pour une machine de sérigraphie |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3569416B1 (fr) |
DE (1) | DE102018003919A1 (fr) |
DK (1) | DK3569416T3 (fr) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH679919A5 (fr) * | 1989-10-23 | 1992-05-15 | Patric Albiez | |
DE29601855U1 (de) * | 1996-02-03 | 1997-06-05 | Robert Bosch Gmbh, 70469 Stuttgart | Rakel für den Siebdruck von elektrischen Elementen und Strukturen |
DE10319773B4 (de) | 2003-05-02 | 2006-04-20 | Koenig & Bauer Ag | Siebdruckzylinder |
US7614341B1 (en) * | 2004-03-12 | 2009-11-10 | General Dynamics Advanced Information Systems, Inc. | Apparatus and method for a segmented squeegee for stenciling |
DE102006012735A1 (de) | 2006-03-17 | 2007-09-20 | Giesecke & Devrient Gmbh | Rotationssiebdruckverfahren, Rotationssiebdruckzylinder und Rakel dafür |
DE202011107661U1 (de) * | 2011-11-07 | 2013-02-08 | Thieme Gmbh & Co. Kg | Siebdruckrakel und Vorrichtung zum Siebdrucken |
-
2018
- 2018-05-16 DE DE102018003919.7A patent/DE102018003919A1/de not_active Withdrawn
-
2019
- 2019-05-13 EP EP19000229.5A patent/EP3569416B1/fr active Active
- 2019-05-13 DK DK19000229.5T patent/DK3569416T3/da active
Also Published As
Publication number | Publication date |
---|---|
EP3569416A1 (fr) | 2019-11-20 |
DK3569416T3 (da) | 2021-10-11 |
DE102018003919A1 (de) | 2019-11-21 |
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