EP3960480A1 - Reduction of picture framing in offset printing by adding at least one inorganic additive to the damping agent - Google Patents
Reduction of picture framing in offset printing by adding at least one inorganic additive to the damping agent Download PDFInfo
- Publication number
- EP3960480A1 EP3960480A1 EP20193821.4A EP20193821A EP3960480A1 EP 3960480 A1 EP3960480 A1 EP 3960480A1 EP 20193821 A EP20193821 A EP 20193821A EP 3960480 A1 EP3960480 A1 EP 3960480A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inorganic additive
- hydrates
- dampening
- offset printing
- solution
- 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.)
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Links
- 239000000654 additive Substances 0.000 title claims abstract description 25
- 230000000996 additive effect Effects 0.000 title claims abstract description 24
- 238000007645 offset printing Methods 0.000 title claims abstract description 24
- 238000009432 framing Methods 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 title description 6
- 238000013016 damping Methods 0.000 title 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 40
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 20
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 20
- 150000004677 hydrates Chemical class 0.000 claims abstract description 19
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 13
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 45
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 150000001340 alkali metals Chemical class 0.000 claims description 12
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 10
- -1 alkaline earth metal sulfates Chemical class 0.000 claims description 10
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 235000002639 sodium chloride Nutrition 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 235000003270 potassium fluoride Nutrition 0.000 claims description 5
- 239000011698 potassium fluoride Substances 0.000 claims description 5
- 235000006666 potassium iodate Nutrition 0.000 claims description 5
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 claims description 5
- 239000001230 potassium iodate Substances 0.000 claims description 5
- 229940093930 potassium iodate Drugs 0.000 claims description 5
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 229910001508 alkali metal halide Inorganic materials 0.000 claims description 2
- 229910001615 alkaline earth metal halide Inorganic materials 0.000 claims description 2
- 238000007639 printing Methods 0.000 abstract description 35
- 239000000976 ink Substances 0.000 description 11
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- FXBYOMANNHFNQV-UHFFFAOYSA-L magnesium;hydrogen sulfate Chemical compound [Mg+2].OS([O-])(=O)=O.OS([O-])(=O)=O FXBYOMANNHFNQV-UHFFFAOYSA-L 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- QWDJLDTYWNBUKE-UHFFFAOYSA-L magnesium bicarbonate Chemical compound [Mg+2].OC([O-])=O.OC([O-])=O QWDJLDTYWNBUKE-UHFFFAOYSA-L 0.000 description 1
- 239000002370 magnesium bicarbonate Substances 0.000 description 1
- 229910000022 magnesium bicarbonate Inorganic materials 0.000 description 1
- 235000014824 magnesium bicarbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- UYNRPXVNKVAGAN-UHFFFAOYSA-L magnesium;diiodate Chemical compound [Mg+2].[O-]I(=O)=O.[O-]I(=O)=O UYNRPXVNKVAGAN-UHFFFAOYSA-L 0.000 description 1
- NALMPLUMOWIVJC-UHFFFAOYSA-N n,n,4-trimethylbenzeneamine oxide Chemical compound CC1=CC=C([N+](C)(C)[O-])C=C1 NALMPLUMOWIVJC-UHFFFAOYSA-N 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 239000011697 sodium iodate Substances 0.000 description 1
- 235000015281 sodium iodate Nutrition 0.000 description 1
- 229940032753 sodium iodate Drugs 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
Definitions
- the offset printing process is a printing process that has been in use in the printing industry for a long time.
- the offset printing presses equipped for this usually include at least one inking unit, printing unit and dampening unit.
- ink is transferred from a printing plate, which is also referred to as a printing form, to the printing material such as paper or cardboard in the form of a thin layer.
- the inking unit always supplies the printing areas with fresh ink.
- the dampening system has the task of providing the non-printing elements of the printing plate with a thin film of dampening solution.
- dampening units are known, for example siphon dampening units, film dampening units and brush dampening units.
- the dampening solution is used to separate the printing and non-printing areas on the printing form, i.e. to avoid ink transfer to ink- or image-free areas of the printing plate.
- fountain solutions are usually used, which consist mainly of water.
- the DE10238874A1 describes a method with which it should be possible to extend the service life of a dampening solution.
- the EP 1 080 943 A1 describes dampening solution that should enable good printing results without the addition of isopropanol to the dampening solution.
- the EP 2 233 311 A1 describes organic additives to fountain solutions for lithographic printing processes, which are intended to reduce deposits during the printing process.
- an inorganic additive preferably being selected from magnesium sulfate and its hydrates, sodium bicarbonate and its mixtures.
- the invention has several advantages. Even after several thousand printing processes, there is hardly any picture framing. The printing process becomes more efficient because fewer or no washing cycles are required. Detergent and descaler are saved.
- the present invention therefore relates to the use of at least one inorganic additive as an addition to a dampening solution to reduce deposits in an offset printing process.
- the deposits are preferably picture framing.
- dampening agents customarily used in offset printing processes can be considered as dampening agents for the subject of the present invention.
- dampening solutions preferably consist predominantly of water and are produced from a dampening solution concentrate.
- Suitable fountain solutions can be alcohol-free or have an alcohol content, for example up to 10% by weight or 20% by weight alcohol.
- the alcohol content is preferably isopropanol.
- Dampening solutions suitable for the present invention are, for example, those marketed by Heidelberger Druckmaschinen AG, Heidelberg, Germany, under the brand name Saphira® or dampening solution that is produced in the printer from dampening solution concentrates available under this brand name.
- the picture framing is essentially due to the printing media used in the printing units of the offset printing process, such as printing inks and varnishes.
- the subject according to the invention makes it possible to reduce picture framing in all print media that are customarily used in offset printing.
- the print media can be, for example, conventional offset printing inks, UV printing inks or hybrid printing inks.
- the at least one inorganic additive comprises at least one of the substances from the group of alkali metal and alkaline earth metal sulfates, alkali metal and alkaline earth metal hydrogen sulfates, alkali metal and alkaline earth metal carbonates, alkali metal and alkaline earth metal hydrogen carbonates, alkali metal and alkaline earth metal halides, alkali metal and alkaline earth metal iodates and their hydrates .
- the at least one inorganic additive comprises at least one of the substances sodium sulfate, magnesium sulfate, sodium hydrogen sulfate, magnesium hydrogen sulfate, sodium carbonate, magnesium carbonate, sodium hydrogen carbonate, magnesium hydrogen carbonate, sodium chloride, potassium chloride, sodium fluoride, potassium fluoride, magnesium fluoride, sodium iodate, potassium iodate, magnesium iodate and hydrates thereof.
- the at least one inorganic additive comprises at least one of the substances magnesium sulfate, magnesium hydrogen sulfate, sodium hydrogen carbonate, sodium chloride, potassium fluoride, potassium iodate and their hydrates.
- the at least one inorganic additive is selected from magnesium sulfate and its hydrates, magnesium hydrogen sulfate, sodium hydrogen carbonate and mixtures thereof.
- the at least one inorganic additive is selected from magnesium sulfate and its hydrates and sodium bicarbonate, in particular from magnesium sulfate and its hydrates.
- Magnesium sulfate and its hydrates are also known as the Epsom salt.
- Sodium bicarbonate is also known as baking soda.
- this can also be present in the form of a mixture with other salts as vacuum salt.
- the present invention relates to a method for reducing deposits in an offset printing process, in which at least one fountain solution is used, in which at least one fountain solution is provided and at least one inorganic additive is added to the at least one fountain solution, which is selected from Magnesium sulfate and its hydrates, sodium hydrogen carbonate, sodium chloride, potassium fluoride, potassium iodate and mixtures thereof, preferably among magnesium sulfate and its hydrates, sodium hydrogen carbonate and mixtures thereof.
- the at least one dampening solution is provided in at least one dampening unit of an offset printing machine and the at least one inorganic additive, preferably those mentioned above as preferred, is added to the at least one dampening solution in the at least one dampening unit.
- the addition of the at least one inorganic additive can take place according to methods which are known in principle, for example by addition in the form of a solid or in the form of a solution, in particular an aqueous solution.
- the at least one inorganic additive preferably those mentioned above as preferred, is added to the at least one fountain solution in the form of an aqueous solution.
- the aqueous solution can be added to the dampening solution, for example, by automatically opening a valve that is connected to a reservoir containing the aqueous solution via a supply line.
- the present invention relates to a dampening solution for an offset printing process which contains at least one of the substances magnesium sulfate and its hydrates and sodium bicarbonate in an amount of at least 0.5 g per 100 L dampening solution, preferably at least 5 g per 100 L dampening solution, particularly preferably at least 10 g per 100 L dampening solution and very particularly preferably at least 30 g per 100 L dampening solution.
- Epsom salt 50 g were added to 100 l of a fountain solution which had been produced using Saphira® Fount 210 AR from Heidelberger Druckmaschinen AG, Heidelberg, Germany.
- the fountain solution obtained was used in the dampening unit of a Speedmaster® offset printing press from Heidelberger Druckmaschinen AG, Heidelberg, Germany, during a print job of 6000 sheets of paper. After the print job was completed, the naked eye could only see small amounts of ink deposits in the printing unit on the blanket cylinder and impression cylinder. The print quality of the paper sheets was perfect.
- Example 2 The same print job as in Example 1 was carried out, with the difference that no Epsom salt was added to the dampening solution. After the print job was completed, the naked eye could clearly see ink deposits in the printing unit on the blanket cylinder and impression cylinder. The print quality of the paper sheets was perfect.
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- Printing Plates And Materials Therefor (AREA)
Abstract
Durch Zusatz wenigstens eines anorganischen Additivs zum Feuchtmittel in einem Offset-Druckverfahren können unerwünschte, auch als "Picture Framing" bekannte Ablagerungen in der Druckmaschine wirkungsvoll verringert werden. Als anorganisches Additiv sind besonders vorteilhaft Magnesiumsulfat und dessen Hydrate und Natriumhydrogencarbonat geeignet.By adding at least one inorganic additive to the dampening solution in an offset printing process, undesirable deposits in the printing press, also known as "picture framing", can be effectively reduced. Magnesium sulfate and its hydrates and sodium bicarbonate are particularly advantageous as inorganic additives.
Description
Das Offset-Druckverfahren ist ein seit langem in der Druckindustrie verbreitetes Druckverfahren, mit dem sich insbesondere bahnförmige und bogenförmige Bedruckstoffe schnell und kostengünstig in hohen Auflagen bedrucken lassen. Die hierfür ausgerüsteten Offset-Druckmaschinen umfassen üblicherweise wenigstens ein Farbwerk, Druckwerk und Feuchtwerk.The offset printing process is a printing process that has been in use in the printing industry for a long time. The offset printing presses equipped for this usually include at least one inking unit, printing unit and dampening unit.
Bei üblichen Offset-Druckverfahren wird von einer Druckplatte, die auch als Druckform bezeichnet wird, Druckfarbe in Form einer dünnen Schicht auf den Bedruckstoff wie beispielsweise Papier oder Karton übertragen. Dabei versorgt das Farbwerk die druckenden Stellen stets mit frischer Farbe. Das Feuchtwerk hat in Offset-Druckverfahren die Aufgabe, die nichtdruckenden Elemente der Druckplatte mit einem dünnen Film eines Feuchtmittels zu versehen. Es sind verschiedene Feuchtwerkstypen bekannt, beispielsweise Heberfeuchtwerke, Filmfeuchtwerke und Bürstenfeuchtwerke. Das Feuchtmittel dient zur Separierung der druckenden und nichtdruckenden Partien auf der Druckform, das heißt dem Vermeiden des Farbübertrags auf farb- bzw. bildfreie Flächen der Druckplatte. Im Offsetdruck werden in der Regel Feuchtmittel eingesetzt, die zum überwiegenden Teil aus Wasser bestehen.In conventional offset printing processes, ink is transferred from a printing plate, which is also referred to as a printing form, to the printing material such as paper or cardboard in the form of a thin layer. The inking unit always supplies the printing areas with fresh ink. In offset printing processes, the dampening system has the task of providing the non-printing elements of the printing plate with a thin film of dampening solution. Various types of dampening units are known, for example siphon dampening units, film dampening units and brush dampening units. The dampening solution is used to separate the printing and non-printing areas on the printing form, i.e. to avoid ink transfer to ink- or image-free areas of the printing plate. In offset printing, fountain solutions are usually used, which consist mainly of water.
In üblichen Offset-Druckverfahren kommt es mit der Zeit zu unerwünschten Ablagerungen der Druckfarbe an nichtdruckenden Stellen in der Druckmaschine außerhalb des Bedruckstoffes, insbesondere auf dem Gummituchzylinder und dem Druckzylinder. Dieses Phänomen wird auch als "Picture Framing" bezeichnet.In conventional offset printing processes, unwanted deposits of the printing ink occur over time on non-printing areas in the printing press outside of the printing material, in particular on the rubber blanket cylinder and the printing cylinder. This phenomenon is also referred to as "picture framing".
Die
Die
Die
Die
In den Druckereien wurden bisher verschiedene Maßnahmen ergriffen, um solche Ablagerungen zu vermeiden oder zu entfernen. Beispielsweise werden Waschvorgänge durchgeführt oder die Feuchtmittelmenge oder die Viskosität der verwendeten Druckfarben variiert. In der Druckindustrie wurden zahlreiche Material- und Anwendungsparameter erforscht, um das Picture Framing zu reduzieren. Trotzdem besteht weiterhin Bedarf an einer einfachen und universell einsetzbaren Lösung, um das Picture Framing auf ein akzeptables Niveau zu verringern.Various measures have been taken in the printing works to avoid or remove such deposits. For example, washing processes are carried out or the amount of dampening solution or the viscosity of the printing inks used is varied. Numerous material and application parameters have been researched in the printing industry in order to reduce picture framing. Nevertheless, there is still a need for a simple and universally applicable solution to reduce picture framing to an acceptable level.
Überraschenderweise wurde nun gefunden, dass es möglich ist, das Picture Framing in Offset-Druckmaschinen deutlich und nachhaltig zu verringern, indem man den üblicherweise verwendeten Feuchtmitteln ein anorganisches Additiv zusetzt, wobei das anorganische Additiv bevorzugt ausgewählt ist unter Magnesiumsulfat und dessen Hydraten, Natriumhydrogencarbonat und deren Mischungen.Surprisingly, it has now been found that it is possible to significantly and sustainably reduce picture framing in offset printing presses by adding an inorganic additive to the dampening solutions commonly used, the inorganic additive preferably being selected from magnesium sulfate and its hydrates, sodium bicarbonate and its mixtures.
Die Erfindung ist mit mehreren Vorteilen verbunden. Auch nach mehreren tausend Druckvorgängen tritt kaum Picture Framing auf. Der Druckvorgang wird effektiver, weil weniger oder keine Waschzyklen mehr benötigt werden. Es werden Waschmittel und Entkalker gespart.The invention has several advantages. Even after several thousand printing processes, there is hardly any picture framing. The printing process becomes more efficient because fewer or no washing cycles are required. Detergent and descaler are saved.
Die vorliegende Erfindung betrifft daher in einem ersten Aspekt die Verwendung wenigstens eines anorganischen Additivs als Zusatz zu einem Feuchtmittel zur Verringerung von Ablagerungen in einem Offset-Druckverfahren. Bei den Ablagerungen handelt es sich bevorzugt um Picture Framing.In a first aspect, the present invention therefore relates to the use of at least one inorganic additive as an addition to a dampening solution to reduce deposits in an offset printing process. The deposits are preferably picture framing.
Als Feuchtmittel für den Gegenstand der vorliegenden Erfindung kommen alle üblicherweise in Offset-Druckverfahren verwendeten Feuchtmittel in Betracht. Solche Feuchtmittel bestehen bevorzugt zum überwiegenden Teil aus Wasser und werden aus einem Feuchtmittelkonzentrat hergestellt. Geeignete Feuchtmittel können alkoholfrei sein oder einen Alkoholanteil aufweisen, beispielsweise bis zu 10 Gew.-% oder 20 Gew.-% Alkohol. Bei dem Alkoholanteil handelt es sich bevorzugt um Isopropanol.All dampening agents customarily used in offset printing processes can be considered as dampening agents for the subject of the present invention. Such dampening solutions preferably consist predominantly of water and are produced from a dampening solution concentrate. Suitable fountain solutions can be alcohol-free or have an alcohol content, for example up to 10% by weight or 20% by weight alcohol. The alcohol content is preferably isopropanol.
Für die vorliegende Erfindung geeignete Feuchtmittel sind beispielsweise solche, die von der Heidelberger Druckmaschinen AG, Heidelberg, Deutschland, unter dem Markennamen Saphira® vertrieben werden beziehungsweise Feuchtmittel, die aus unter diesem Markennamen erhältlichen Feuchtmittelkonzentraten in der Druckerei hergestellt werden.Dampening solutions suitable for the present invention are, for example, those marketed by Heidelberger Druckmaschinen AG, Heidelberg, Germany, under the brand name Saphira® or dampening solution that is produced in the printer from dampening solution concentrates available under this brand name.
Das Picture Framing ist im Wesentlichen auf die in den Druckwerken des Offset-Druckverfahrens verwendeten Druckmedien wie Druckfarben und Lacke zurückzuführen. Durch den erfindungsgemäßen Gegenstand lässt sich das Picture Framing prinzipiell bei allen üblicherweise im Offsetdruck eingesetzten Druckmedien verringern. Es kann sich bei den Druckmedien beispielsweise um konventionelle Offsetdruckfarben, UV-Druckfarben oder Hybriddruckfarben handeln.The picture framing is essentially due to the printing media used in the printing units of the offset printing process, such as printing inks and varnishes. In principle, the subject according to the invention makes it possible to reduce picture framing in all print media that are customarily used in offset printing. The print media can be, for example, conventional offset printing inks, UV printing inks or hybrid printing inks.
In einer bevorzugten Ausführungsform umfasst das wenigstens eine anorganische Additiv wenigstens einen der Stoffe aus der Gruppe der Alkali- und Erdalkalisulfate, Alkali- und Erdalkalihydrogensulfate, Alkali- und Erdalkalicarbonate, Alkali- und Erdalkalihydrogencarbonate, Alkali- und Erdalkalihalogenide, Alkali- und Erdalkaliiodate und deren Hydraten.In a preferred embodiment, the at least one inorganic additive comprises at least one of the substances from the group of alkali metal and alkaline earth metal sulfates, alkali metal and alkaline earth metal hydrogen sulfates, alkali metal and alkaline earth metal carbonates, alkali metal and alkaline earth metal hydrogen carbonates, alkali metal and alkaline earth metal halides, alkali metal and alkaline earth metal iodates and their hydrates .
In einer besonders bevorzugten Ausführungsform umfasst das wenigstens eine anorganische Additiv wenigstens einen der Stoffe Natriumsulfat, Magnesiumsulfat, Natriumhydrogensulfat, Magnesiumhydrogensulfat, Natriumcarbonat, Magnesiumcarbonat, Natriumhydrogencarbonat, Magnesiumhydrogencarbonat, Natriumchlorid, Kaliumchlorid, Natriumfluorid, Kaliumfluorid, Magnesiumfluorid, Natriumiodat, Kaliumiodat, Magnesiumiodat und deren Hydrate.In a particularly preferred embodiment, the at least one inorganic additive comprises at least one of the substances sodium sulfate, magnesium sulfate, sodium hydrogen sulfate, magnesium hydrogen sulfate, sodium carbonate, magnesium carbonate, sodium hydrogen carbonate, magnesium hydrogen carbonate, sodium chloride, potassium chloride, sodium fluoride, potassium fluoride, magnesium fluoride, sodium iodate, potassium iodate, magnesium iodate and hydrates thereof.
In einer ganz besonders bevorzugten Ausführungsform umfasst das wenigstens eine anorganische Additiv wenigstens einen der Stoffe Magnesiumsulfat, Magnesiumhydrogensulfat, Natriumhydrogencarbonat, Natriumchlorid, Kaliumfluorid, Kaliumiodat und deren Hydrate.In a very particularly preferred embodiment, the at least one inorganic additive comprises at least one of the substances magnesium sulfate, magnesium hydrogen sulfate, sodium hydrogen carbonate, sodium chloride, potassium fluoride, potassium iodate and their hydrates.
In einer speziellen Ausführungsform ist das wenigstens eine anorganische Additiv ausgewählt unter Magnesiumsulfat und dessen Hydraten, Magnesiumhydrogensulfat, Natriumhydrogencarbonat und deren Mischungen.In a specific embodiment, the at least one inorganic additive is selected from magnesium sulfate and its hydrates, magnesium hydrogen sulfate, sodium hydrogen carbonate and mixtures thereof.
In einer ganz speziellen Ausführungsform ist das wenigstens eine anorganische Additiv ausgewählt unter Magnesiumsulfat und dessen Hydraten und Natriumhydrogencarbonat, insbesondere unter Magnesiumsulfat und dessen Hydraten.In a very specific embodiment, the at least one inorganic additive is selected from magnesium sulfate and its hydrates and sodium bicarbonate, in particular from magnesium sulfate and its hydrates.
Magnesiumsulfat und dessen Hydrate werden auch als Epsomsalz bezeichnet. Natriumhydrogencarbonat wird auch als Natron bezeichnet. In einer erfindungsgemäßen Ausführungsform, die Natriumchlorid als anorganisches Additiv umfasst, kann dieses auch in Form einer Mischung mit anderen Salzen als Siedesalz vorliegen.Magnesium sulfate and its hydrates are also known as the Epsom salt. Sodium bicarbonate is also known as baking soda. In an embodiment according to the invention, which includes sodium chloride as an inorganic additive, this can also be present in the form of a mixture with other salts as vacuum salt.
Die vorliegende Erfindung betrifft in einem weiteren Aspekt ein Verfahren zur Verringerung von Ablagerungen in einem Offset-Druckverfahren, in dem wenigstens ein Feuchtmittel verwendet wird, bei dem man wenigstens ein Feuchtmittel bereitstellt und dem wenigstens einen Feuchtmittel wenigstens ein anorganisches Additiv zusetzt, das ausgewählt ist unter Magnesiumsulfat und dessen Hydraten, Natriumhydrogencarbonat, Natriumchlorid, Kaliumfluorid, Kaliumiodat und deren Mischungen, bevorzugt unter Magnesiumsulfat und dessen Hydraten, Natriumhydrogencarbonat und deren Mischungen.In a further aspect, the present invention relates to a method for reducing deposits in an offset printing process, in which at least one fountain solution is used, in which at least one fountain solution is provided and at least one inorganic additive is added to the at least one fountain solution, which is selected from Magnesium sulfate and its hydrates, sodium hydrogen carbonate, sodium chloride, potassium fluoride, potassium iodate and mixtures thereof, preferably among magnesium sulfate and its hydrates, sodium hydrogen carbonate and mixtures thereof.
In einer bevorzugten Ausführungsform stellt man das wenigstens eine Feuchtmittel in wenigstens einem Feuchtwerk einer Offset-Druckmaschine bereit und setzt das wenigstens eine anorganische Additiv, bevorzugt die oben als bevorzugt genannten, dem wenigstens einen Feuchtmittel in dem wenigstens einen Feuchtwerk zu.In a preferred embodiment, the at least one dampening solution is provided in at least one dampening unit of an offset printing machine and the at least one inorganic additive, preferably those mentioned above as preferred, is added to the at least one dampening solution in the at least one dampening unit.
Das Zusetzen des wenigstens einen anorganischen Additivs kann nach prinzipiell bekannten Verfahren erfolgen, beispielsweise durch Zugabe in Form eines Feststoffes oder in Form einer Lösung, insbesondere einer wässrigen Lösung. In einer bevorzugten Ausführungsform setzt man das wenigstens eine anorganische Additiv, bevorzugt die oben als bevorzugt genannten, dem wenigstens einen Feuchtmittel in Form einer wässrigen Lösung zu. Das Zusetzen der wässrigen Lösung zu dem Feuchtmittel kann beispielsweise durch automatisiertes Öffnen eines Ventils, das über eine Zuleitung an ein Reservoir mit der wässrigen Lösung angeschlossen ist, erfolgen.The addition of the at least one inorganic additive can take place according to methods which are known in principle, for example by addition in the form of a solid or in the form of a solution, in particular an aqueous solution. In a preferred embodiment, the at least one inorganic additive, preferably those mentioned above as preferred, is added to the at least one fountain solution in the form of an aqueous solution. The aqueous solution can be added to the dampening solution, for example, by automatically opening a valve that is connected to a reservoir containing the aqueous solution via a supply line.
Die vorliegende Erfindung betrifft in einem weiteren Aspekt ein Feuchtmittel für ein Offset-Druckverfahren, das wenigstens einen der Stoffe Magnesiumsulfat und dessen Hydrate und Natriumhydrogencarbonat in einer Menge von wenigstens 0,5 g pro 100 L Feuchtmittel, bevorzugt wenigstens 5 g pro 100 L Feuchtmittel, besonders bevorzugt wenigstens 10 g pro 100 L Feuchtmittel und ganz besonders bevorzugt wenigstens 30 g pro 100 L Feuchtmittel umfasst.In a further aspect, the present invention relates to a dampening solution for an offset printing process which contains at least one of the substances magnesium sulfate and its hydrates and sodium bicarbonate in an amount of at least 0.5 g per 100 L dampening solution, preferably at least 5 g per 100 L dampening solution, particularly preferably at least 10 g per 100 L dampening solution and very particularly preferably at least 30 g per 100 L dampening solution.
Durch den Zusatz des wenigstens einen anorganischen Additivs zum Feuchtmittel lassen sich Ablagerungen, die beim Offset-Druckverfahren in Form von Picture Framing entstehen, deutlich sichtbar verringern.By adding the at least one inorganic additive to the dampening solution, deposits that occur in the form of picture framing in the offset printing process can be clearly and visibly reduced.
Man gab 50 g Epsomsalz zu 100 L eines Feuchtmittels, das man mit Saphira® Fount 210 AR der Heidelberger Druckmaschinen AG, Heidelberg, Deutschland, hergestellt hatte. Das erhaltene Feuchtmittel wurde im Feuchtwerk einer Offset-Druckmaschine Speedmaster® der Heidelberger Druckmaschinen AG, Heidelberg, Deutschland, während eines Druckauftrags von 6000 Papierbögen verwendet. Nach Abschluss des Druckauftrags waren mit bloßem Auge nur geringe Farbablagerungen im Druckwerk auf Gummituchzylinder und Druckzylinder zu erkennen. Die Druckqualität der Papierbögen war einwandfrei.50 g of Epsom salt were added to 100 l of a fountain solution which had been produced using Saphira® Fount 210 AR from Heidelberger Druckmaschinen AG, Heidelberg, Germany. The fountain solution obtained was used in the dampening unit of a Speedmaster® offset printing press from Heidelberger Druckmaschinen AG, Heidelberg, Germany, during a print job of 6000 sheets of paper. After the print job was completed, the naked eye could only see small amounts of ink deposits in the printing unit on the blanket cylinder and impression cylinder. The print quality of the paper sheets was perfect.
Man führte den gleichen Druckauftrag wie in Beispiel 1 durch, mit dem Unterschied, dass man dem Feuchtmittel kein Epsomsalz zusetzte. Nach Abschluss des Druckauftrags waren mit bloßem Auge deutliche Farbablagerungen im Druckwerk auf Gummituchzylinder und Druckzylinder zu erkennen. Die Druckqualität der Papierbögen war einwandfrei.The same print job as in Example 1 was carried out, with the difference that no Epsom salt was added to the dampening solution. After the print job was completed, the naked eye could clearly see ink deposits in the printing unit on the blanket cylinder and impression cylinder. The print quality of the paper sheets was perfect.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20193821.4A EP3960480A1 (en) | 2020-09-01 | 2020-09-01 | Reduction of picture framing in offset printing by adding at least one inorganic additive to the damping agent |
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| Application Number | Priority Date | Filing Date | Title |
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| EP20193821.4A EP3960480A1 (en) | 2020-09-01 | 2020-09-01 | Reduction of picture framing in offset printing by adding at least one inorganic additive to the damping agent |
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| EP2233311A1 (en) | 2009-03-25 | 2010-09-29 | Fujifilm Corporation | Fountain solution composition for lithographic printing and heat-set offset rotary printing process |
| WO2012061370A2 (en) | 2010-11-01 | 2012-05-10 | Sun Chemical Corporation | Fountain solutions for offset lithographic printing inks |
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- 2020-09-01 EP EP20193821.4A patent/EP3960480A1/en not_active Withdrawn
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| US4374036A (en) * | 1980-04-16 | 1983-02-15 | Michael A. Canale | Composition and concentrate useful for making a fountain solution for lithographic printing operations |
| EP0219719A1 (en) * | 1985-10-12 | 1987-04-29 | DS-Druckerei Service | Fountain solution for lithographic printing |
| EP0251621A2 (en) * | 1986-07-02 | 1988-01-07 | Sun Chemical Corporation | Fountain solutions and printing processes utilising them |
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