EP3615335A1 - Verhindern einer übertragung frischer druckfarbe auf die rückseite anderer bögen beim bogenstichtiefdruck - Google Patents
Verhindern einer übertragung frischer druckfarbe auf die rückseite anderer bögen beim bogenstichtiefdruckInfo
- Publication number
- EP3615335A1 EP3615335A1 EP18720100.9A EP18720100A EP3615335A1 EP 3615335 A1 EP3615335 A1 EP 3615335A1 EP 18720100 A EP18720100 A EP 18720100A EP 3615335 A1 EP3615335 A1 EP 3615335A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- delivery
- cooling
- intaglio printing
- stack
- delivery stack
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
- B41F9/002—Sheet printing presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F22/00—Means preventing smudging of machine parts or printed articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/0476—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/40—Type of handling process
- B65H2301/44—Moving, forwarding, guiding material
- B65H2301/446—Assisting moving, forwarding or guiding of material
- B65H2301/4461—Assisting moving, forwarding or guiding of material by blowing air towards handled material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/514—Modifying physical properties
- B65H2301/5144—Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/40—Temperature; Thermal conductivity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2601/00—Problem to be solved or advantage achieved
- B65H2601/20—Avoiding or preventing undesirable effects
- B65H2601/25—Damages to handled material
- B65H2601/251—Smearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/21—Industrial-size printers, e.g. rotary printing press
Definitions
- the invention relates to a method for preventing a transfer of fresh ink to the back of subsequent or previous sheets in the sheet delivery on a delivery pile after a gravure printing process.
- the invention further relates to a intaglio printing machine with a intaglio printing unit and a subsequent delivery path for laying out printed sheets on a delivery stack. Since the beginning of time, with intaglio printing with oxidatively drying inks starting from a certain stack height, fresh ink has been transferred to the back of the following or previous sheet in the delivery stack.
- This effect is referred to as "depositing” and causes in the stack by transferred ink soiling of the unprinted back of the other sheet or a change of the printed image of a back of an already printed other sheet.
- the deposition is favored by a delayed oxidative drying, a increased ink layer thickness with uneven distribution on the printing sheet, a limitation of the admixture of additives for reasons of ink adhesion, smooth coated substrates, a poor flatness of the substrates, the printing of foil, metal, intaglio or other surfaces that represent a barrier or
- the conditions for intaglio printing are fundamentally different than for offset sheetfed printing processes, since the tendency to deposit is further enhanced by the very high paint application combined with embossing the substrates, a strain of the substrate sheet by the high compressive force in conjunction with the effect of heat by the printing cylinder, a poor flatness by substrate equipment with security threads or watermarks, such as occur in banknote printing, partial stress zones due to poor flatness in combination with a possibly un
- WO 01/21404 AI describes a central compressed air supply device for a printing machine, in which a plurality of air pumps on the suction side cooled air is provided. The goal is to avoid warping the bow. It is also mentioned that the cooled air should be "favorable for printing or coating" and avoids "splintering" of paint. Further explanations as to which framework conditions are actually favorable are not found in the document, for the cooled air temperatures between 1-14 ° C. are mentioned, preferably a value of about 6 ° C.
- EP 1306212 AI envisages the use of cooled blown air Bogenry- tion, with each fan in the sheet guide a cooling coil is arranged downstream. This heat is dissipated, which was introduced from the environment of the machine, for example, by drying device dissipated become. It is a conventional sheetfed and web press.
- intaglio printing machines in particular for banknote printing, the depositing and the associated quality deviations, reworking and productivity losses are very expensive. It has therefore begun to work in intaglio printing with comparatively low stack heights in the delivery pile. While conventional offset printing can work with stack heights in excess of 10,000 sheets and over one meter in height, intaglio printing only allows stack heights of 1-500 sheets to avoid high weights of sheets over each other, increasing the risk of dropping. Therefore, known intaglio printing machines, such as the printing press Notasys Super-Orlof Intaglio of Koenig & Bauer AG, with a double
- the invention is therefore based on the object of specifying an improved method for preventing the depositing, that is to say a transfer of fresh printing ink to the back side following the following or previous sheet during the sheet delivery on a delivery stack after a gravure printing process.
- the invention is further based on the object to provide a gravure printing machine in which the depositing is reduced.
- the object is solved by the subject matter of the independent claims.
- Advantageous embodiments are the subject of the dependent claims.
- the invention is based on the surprising finding that cooling the sheets after the intaglio printing process in such a way that the temperature of the delivery stack is set to a maximum of 21 ° C. significantly reduces the laying down. Actually, one would assume that the oxidative drying of the ink increases with increasing temperature and thus the deposition is reduced. Experiments with corresponding heat dryers, as they are known for offset printing or other printing processes, however, showed a contrary result and were surprisingly significantly inferior to a cooling with the mentioned characteristics.
- the cooling of the sheets after the intaglio process is constituteichate on the exhibition line.
- the supply air is provided accordingly cooled. It is particularly preferred to cool the supply air to 17 - 20 ° C and in particular a relative humidity below 80%, preferably from 45 to 55%. In one embodiment, the supply air is cooled to below 17 ° C., preferably to 11-16 ° C. or 13-15 ° C., and in particular a relative humidity of less than 80%, preferably of 45-55%, is set.
- cooling plates on the delivery stack in order to additionally cool the delivery stack.
- the invention provides that the delivery stack is set to a temperature of at most 21 ° C, which corresponds to the initial level of the temperature of the sheet before entering the intaglio printing machine.
- a temperature of at most 21 ° C which corresponds to the initial level of the temperature of the sheet before entering the intaglio printing machine.
- an air cooling ensured that the dew point is not exceeded, otherwise condensation could occur.
- a combination of temperature and humidity is selected which does not reach or fall below the dew point in any area of the intaglio printing machine.
- the cooling of the sheets after the intaglio printing process is preferably independent of other temperature control tasks on the intaglio printing press, in particular independently of heating or cooling of the printing cylinders.
- Their temperature must be set very precisely in order to obtain a good printing result, since the temperature of the cylinder for the ink application to the printing cylinder and the ink transfer to the substrate has great significance. It is therefore particularly advantageous to provide independent devices and in particular an independent cooling device for the cooling of the sheets after the intaglio printing process. This is especially true in the event that otherwise cooled air is needed on the gravure printing machine.
- the cooling device is preferably arranged externally, so it does not lie in the already generated air flow. Further, preferably only the delivery path is cooled, wherein the already existing air cushion is designed as a cooled Heilpolter.
- the cooling of the sheet is adjusted so that the mentioned temperature of the delivery pile is not exceeded.
- the temperature of the delivery stack is regulated to a temperature range of 17-21 ° C., preferably 20-21 ° C.
- the cooling device of the intaglio printing machine has a corresponding temperature sensor which detects the temperature of the delivery tray and controls the cooling device accordingly ,
- An intaglio printing machine 1 comprises a supply stack 2, from which the sheet to be printed is fed to a intaglio printing unit 3.
- the intaglio printing unit 31 of the intaglio printing unit 3 prints the sheets.
- a dryer unit 32 is regularly absent. This, if any, only optional subunit of the intaglio printing unit 3 is presently shown primarily to make the difference to dryer-related cooling better recognizable. Any pressure-accompanying or dryer-related cooling would be part of the intaglio printing unit 3 a central cooling.
- the printed sheet is transported from the intaglio printing unit 3 in the delivery unit 4.
- a transport path between these two units is not specified and, if necessary, assigned to the central intaglio printing unit 3.
- the display unit 4 conventionally comprises at least one delivery stack 43 and a transport path 41 for transporting the sheet to the delivery stack 43.
- the sheets are conveyed to the delivery stack 43 via the delivery path or transport path 41.
- the sheets are carried during their transport by an air cushion.
- This air cushion is generated by fans, which are for example mounted laterally on the drive side of the delivery line.
- Supply air can be supplied via supply air ducts 42.
- the stitch type printing machine 1 is, for example, a type Notasys Super-Orlof Intaglio machine of Koenig & Bauer AG.
- the sheets are cooled on the delivery path 41 (and possibly in the delivery pile). This is done by feeding the air cushion generating sheet guide with cooled air.
- the mentioned fans are supplied with cooled air.
- a supply air cooling device 451 is provided in each case, which emits cooled air in a supply air duct 42, which supply the fans with supply air. It has been shown that to avoid depositing a temperature of the delivery stack of a maximum of 21 ° C is set. This temperature value is preferably at least 1 ° C. below the temperature at which the sheets in the feed stack 2 were provided.
- decentralized cooling 45 in the delivery unit 4 comprises cooling devices 451 (and 459) and at least one temperature sensor 453 and a control unit 452.
- the decentralized cooling 45 is independent of cooling units which are centrally available in the intaglio printing unit 31.
- the decentralized cooling 45 allows just a stack-related adjustment of the temperature and is also independent of specifications, boundary conditions or units of the intaglio printing unit. Furthermore, it can be retrofitted comparatively easily.
- the supply air cooling device 451 is adjusted so that the air supplied in the cooled air cushion supply duct 452 has a temperature that cools the printed sheets so that the delivery stack has the desired temperature of 21 ° C.
- a control unit 452 is provided that z. B. detected by a temperature sensor 453, the temperature of the delivery stack.
- the temperature sensor 453 may be designed as a contact sensor or as a contactless temperature sensor, for example as an infrared sensor. In the schematic illustration of the figure, the temperature sensor 453 is shown on the side of the delivery stack. This is not mandatory.
- the temperature of the delivery stack is due to the temperature of the printed sheet (warm sheets lead to the delivery pile still heat if necessary), it is expedient to provide the temperature sensor in the upper part of the delivery stack or even to design it directly to the temperature of the sheet prior to insertion into the delivery stack 43.
- the controller 452 controls the cooler 451 so that the temperature of each printed sheet arriving at the end of the delivery line 41 has been cooled to exactly the desired target temperature of the delivery stack, for example 21 ° C.
- the intaglio printing machine 1 has no heating devices (dryers), which heat the sheets after the printing process.
- the heating of the printed sheets is inevitably effected in intaglio printing unit 31 by a system-dependent heating of the cylinders.
- the cooling device 45 additionally comprises one or more cooling plates 459 which stabilizes the temperature of the delivery stack 43 to the desired value.
- the cooling plates 459 are optional.
- the sheets are cooled exclusively on the path of the sheets along the delivery path 5 in front of the delivery stack 6. It has been shown that this cooling cures waxes contained in the printing inks and thus solves the problem of depositing.
- the air cushion is used for this cooling, which in any case prevents the sheets printed with wet ink from falling down or touching machine parts when the sheets are being fed, resulting in a lubricate the lead at the beginning of the exhibition line 5 still very fresh ink.
- the controller 10 performs a control of the target temperature of the delivery stack 6 to a target value of z. B. by a regulation of the sheet temperature at the end of the exhibition line. 5
- the intaglio printing machine 1 has maximum stacking heights in the delivery stack 6, which amounted to at least 1,000 sheets in the case of EPI subs, comprises at least 500 sheets in the case of polymer substrates or hybrid substrates and at least 1,000 sheets in the case of coated substrates.
- This stack heights are possible without problems, since the deposition is no longer a problem due to the adjustment of the temperature of the delivery stack 6, so that despite greater stack heights less production loss, less waste and less rework is required.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Printing Methods (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017004053.2A DE102017004053A1 (de) | 2017-04-26 | 2017-04-26 | Verhindern einer Übertragung frischer Druckfarbe auf die Rückseite anderer Bögen beim Bogenstichtiefdruck |
| PCT/EP2018/000216 WO2018197039A1 (de) | 2017-04-26 | 2018-04-23 | Verhindern einer übertragung frischer druckfarbe auf die rückseite anderer bögen beim bogenstichtiefdruck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3615335A1 true EP3615335A1 (de) | 2020-03-04 |
Family
ID=62062972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18720100.9A Withdrawn EP3615335A1 (de) | 2017-04-26 | 2018-04-23 | Verhindern einer übertragung frischer druckfarbe auf die rückseite anderer bögen beim bogenstichtiefdruck |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3615335A1 (de) |
| DE (1) | DE102017004053A1 (de) |
| WO (1) | WO2018197039A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023118566A1 (de) | 2023-07-13 | 2025-01-16 | Giesecke+Devrient Currency Technology Gmbh | Katalytisch beschleunigte farbtrocknung auf einem wertdokument |
| DE102023118574A1 (de) | 2023-07-13 | 2025-01-16 | Giesecke+Devrient Currency Technology Gmbh | Katalytische antimikrobielle reinigung eines wertdokuments |
| DE102024114181A1 (de) * | 2024-05-21 | 2025-11-27 | Giesecke+Devrient Currency Technology Gmbh | Schaltbare kapsellumineszenzpigmente |
| DE102024114183A1 (de) | 2024-05-21 | 2025-11-27 | Giesecke+Devrient Currency Technology Gmbh | System schaltbarer kapsellumineszenzpigmente |
| DE102024114179A1 (de) * | 2024-05-21 | 2025-12-11 | Giesecke+Devrient Currency Technology Gmbh | Schaltbare kapsellumineszenzpigmente |
| DE102024114178A1 (de) * | 2024-05-21 | 2025-11-27 | Giesecke+Devrient Currency Technology Gmbh | System schaltbarer kapsellumineszenzpigmente |
| DE102024114180A1 (de) | 2024-05-21 | 2025-11-27 | Giesecke+Devrient Currency Technology Gmbh | Schaltbare kapsellumineszenzpigmente |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19945272B4 (de) | 1999-09-22 | 2004-03-11 | Baldwin Germany Gmbh | Druckluftversorgungseinrichtung einer Druckmaschine oder einer Bogen-Handhabungsvorrichtung |
| DE10140321B4 (de) | 2001-08-16 | 2005-06-23 | Koenig & Bauer Ag | Einrichtung zur Warmluftabsaugung und Kühlung |
| DE10144159A1 (de) * | 2001-09-08 | 2003-03-27 | Koenig & Bauer Ag | Bogenleiteinrichtung |
| DE10150041B4 (de) * | 2001-10-10 | 2006-06-01 | Platsch Gmbh & Co.Kg | Austrag-Kühleinrichtung für eine Druckmaschine |
| DE10152593A1 (de) | 2001-10-24 | 2003-05-08 | Koenig & Bauer Ag | Einrichtung zur Bedruckstoff- und Druckwerkskühlung mittels gekühlter Blasluft an Bogenrotationsdruckmaschinen |
-
2017
- 2017-04-26 DE DE102017004053.2A patent/DE102017004053A1/de not_active Withdrawn
-
2018
- 2018-04-23 WO PCT/EP2018/000216 patent/WO2018197039A1/de not_active Ceased
- 2018-04-23 EP EP18720100.9A patent/EP3615335A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017004053A1 (de) | 2018-10-31 |
| WO2018197039A1 (de) | 2018-11-01 |
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