EP0219719B1 - Fountain solution for lithographic printing - Google Patents
Fountain solution for lithographic printing Download PDFInfo
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- EP0219719B1 EP0219719B1 EP86113359A EP86113359A EP0219719B1 EP 0219719 B1 EP0219719 B1 EP 0219719B1 EP 86113359 A EP86113359 A EP 86113359A EP 86113359 A EP86113359 A EP 86113359A EP 0219719 B1 EP0219719 B1 EP 0219719B1
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- dampening
- solutions
- offset printing
- solution
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- 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 invention relates to dampening solutions or dampening solution concentrates for offset printing.
- So-called “fountain solution” is required in offset printing in order to adhere the non-image areas of the printing plates free of printing ink during the printing process while the printing ink is being applied to the printing plates clamped on the printing cylinders. It is necessary for the quality of the print that the fountain solution or dampening solution wets the non-image areas of the printing plates well and furthermore properly emulsifies with the printing ink applied in the image areas.
- dampening solutions for offset printing essentially consist of water, to which small amounts of modifying additives such as pH-regulating substances, humectants, wetting agents, film formers, preservatives and, if appropriate, water-miscible organic solvents are usually added.
- modifying additives such as pH-regulating substances, humectants, wetting agents, film formers, preservatives and, if appropriate, water-miscible organic solvents are usually added.
- the fountain solution is usually prepared by the printer itself before the printing process, the modifying additives now being predominantly in the form of prefabricated fountain solution additives or dampening solution concentrates provided by the relevant specialist supply trade and only need to be added to water or diluted with water.
- dampening agents can lead to signs of corrosion on the parts of the printing press that come into contact with them, in particular on the printing cylinders, which are predominantly made of nickel metal or have a nickel coating.
- the signs of corrosion can show up in the dissolution of nickel metal on the cylinder surfaces up to severe cases of pitting, primarily in the contact areas between the printing plates and the printing cylinders.
- the consequences are dimensional changes that can have a negative impact on the quality of the printing result, shorter downtimes of the printing cylinders and shorter runs, as well as serious damage to the printing press.
- the invention thus relates to dampening solutions or dampening solution concentrates for offset printing which have a copper ion content of 0.01-100 ppm, preferably 0.1-10 ppm, or 0.1-1000 ppm, preferably 1-500 ppm exhibit.
- the invention further relates to dampening solutions or dampening solution concentrates for offset printing, which also have a silicate content.
- the invention also relates to a method for preventing corrosion phenomena caused by dampening solutions on offset printing presses, in which copper ions are added to the dampening solutions used or their concentrates.
- the invention relates to the use of copper ions in a concentration of 0.01-100 ppm as an anti-corrosive additive in dampening solutions for offset printing.
- hydrophilizing agents are known, with the aid of which, by means of appropriate pretreatment, electrophotographically sensitized zinc oxide layers normally provided for the dry copying process can also be used in small offset printing.
- These agents are based on special metal salt solutions and can also contain copper salts. They can also be used as a dampening solution in this specific application.
- the minimum concentrations of metal salt are at least a power of ten above the maximum concentration for copper in the dampening solutions according to the invention. This pressure is an anti-corrosive effect due to the possible copper content font not to be extracted.
- the corrosive effect on nickel metal of all dampening solutions of any composition used in offset printing can be drastically reduced or practically completely prevented.
- contents of 0.01-100 ppm, preferably 0.1-10 ppm, of copper ions in the ready-to-use dampening solution have proven to be effective.
- a copper ion content of only 0.1 ppm in the ready-to-use dampening solution results in a reduction of the nickel removal by approx. 90% in comparison with a corresponding dampening solution which does not contain any corrosion inhibitors.
- the corrosion inhibitor iH-benzotriazole known from EP-108 883 in the concentration of 0.01% ( _ 100 ppm), which is several orders of magnitude higher, only results in a reduction of the nickel removal by about 60%.
- even higher concentrations are generally not economical.
- the removal of nickel is practically completely prevented if the dampening solution additionally contains silications, of the order of magnitude of 1 to 1000 ppm, preferably 10 to 500 ppm.
- the amounts of copper ions and, if necessary, of silications required to prevent corrosion can be added in the form of corresponding salts to the ready-to-use dampening solutions of the usual composition before the actual use in the printing process.
- all copper salts that are readily water-soluble and release copper ions in an aqueous medium are suitable.
- Suitable copper salts are, for example, copper sulfate, copper nitrate, copper acetate and copper chloride.
- Preferred suppliers are about alkali metal silicates such as sodium water glass and potassium water glass.
- dampening solution concentrates are usually concentrated aqueous solutions, but occasionally also solid, powder, tablet or pasty products, which contain the additives required for fountain solutions in offset printing.
- the ready-to-use dampening solutions are prepared from these concentrates by diluting or dissolving them in water to give about 1-10%, preferably 2-5%, solutions. Due to the locally differing and frequently varying process water qualities and their experience with the dampening solution, which is difficult to calculate, it is advisable to use treated water, preferably demineralized water or hardness 8 - 12 ° dH, when preparing the dampening solution.
- the dampening solution concentrates generally contain, in mostly empirically determined, often different proportions, the most diverse substances controlling the properties of the dampening solution. They practically always contain pH regulators, which usually bring about a pH in the range of about 3 - 6, usually around pH 5. Citrate buffers are mainly used for this. Furthermore, these concentrates can contain humectants, mostly based on polyalcohols such as glycols, glycerol, sorbitol, hexitol or polyglycols, film formers such as gum arabic, wetting agents such as cationic, anionic, nonionic or amphoteric surfactants, preferably nonionic surfactants, and often also softening agents, for example complexing agents like EDTA.
- polyalcohols such as glycols, glycerol, sorbitol, hexitol or polyglycols
- film formers such as gum arabic
- wetting agents such as cationic, anionic, nonionic or am
- these concentrates usually still contain commercially available preservatives which have an antimicrobial and / or antifungal effect.
- dampening solution concentrates also contain solubilizing substances such as, for example, water-compatible organic solvents, mostly alcohols such as methanol, ethanol or isopropanol, for the purpose of uniform dissolution of the different ingredients.
- such dampening solution concentrates with the necessary quanta of copper ions or, if necessary, also of silications can also be advantageously added to prevent corrosion.
- the copper ion content is about 0.1-1000 ppm, preferably 1-500 ppm
- the silicate content is 10-10000 ppm, preferably 100-5000 ppm.
- Typical dampening solution concentrates according to the invention contain, for example, 5-15% by weight, preferably around 10% by weight glycerol, 2-10% by weight, preferably around 5% by weight citrate buffer, 1-5% by weight, preferably approximately 3% by weight gum arabic, about 1% by weight of preservative, 3 - 10% by weight, preferably about 5% by weight of isopropanol and 0.0001 - 0.05% by weight of copper nitrate (corresponding to about 1 - 500 ppm copper ions) and optionally 0.01-0.5% by weight sodium silicate (corresponding to approximately 100-5000 ppm silications).
- 5-15% by weight preferably around 10% by weight glycerol, 2-10% by weight, preferably around 5% by weight citrate buffer, 1-5% by weight, preferably approximately 3% by weight gum arabic, about 1% by weight of preservative, 3 - 10% by weight, preferably about 5% by weight of isopropanol and 0.0001 - 0.05% by weight of copper
- the solution has a pH of 4.0. It is used in the form of a 4% aqueous solution (in demineralized water) as a fountain solution in a known manner in offset printing.
- a dampening solution concentrate is prepared
- the solution has a pH of 4.2. It is used in the form of a 4% aqueous solution (in demineralized water) as a fountain solution in a known manner in offset printing.
- a dampening solution concentrate was first prepared as in Example 1, but without copper nitrate. A series of dampening solutions in the form of 4% aqueous solutions were then produced from this. Corrosion inhibitors according to the invention and known corrosion inhibitors were then added to this dampening solution, partly in different concentrations.
- Nickel tubes of 3 cm in diameter were then immersed in these sample solutions to a depth of approximately 4 cm and exposed to the action of the respective solution in question for a relatively long time.
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Description
Die Erfindung betrifft Feuchtmittel bzw. Feuchtmittelkonzentrate für den Offsetdruck. Im Offsetdruck wird sogenanntes "Feuchtwasser" benötigt, um im Druckvorgang während des Aufbringens der Druckfarbe auf die auf den Druckzylindern aufgespannten Druckplatten die Nichtbildstellen der Druckplatten frei von Druckfarbe zu haften. Hierbei ist es für die Qualität des Druckes erforderlich, daß das Feuchtwasser bzw. Feuchtmittel die Nichtbildstellen der Druckplatten gut benetzt und sich desweiteren mit der in den Bildbereichen aufgebrachten Druckfarbe richtig emulgiert. Derartige Feuchtmittel für den Offsetdruck bestehen im wesentlichen aus Wasser, dem üblicherweise geringe Mangln an modifizierenden Zusätzen wie pH-regulierende Substanzen, Feuchthaltemittel, Netzmittel, Filmbildner, Konservierungsmittel sowie gegebenenfalls mit Wasser mischbare organische Lösungsmittel beigegeben sind.The invention relates to dampening solutions or dampening solution concentrates for offset printing. So-called "fountain solution" is required in offset printing in order to adhere the non-image areas of the printing plates free of printing ink during the printing process while the printing ink is being applied to the printing plates clamped on the printing cylinders. It is necessary for the quality of the print that the fountain solution or dampening solution wets the non-image areas of the printing plates well and furthermore properly emulsifies with the printing ink applied in the image areas. Such dampening solutions for offset printing essentially consist of water, to which small amounts of modifying additives such as pH-regulating substances, humectants, wetting agents, film formers, preservatives and, if appropriate, water-miscible organic solvents are usually added.
Das Feuchtwasser wird üblicherweise vor dem Druckvorgang vom Drucker selbst zubereitet, wobei die modifizierenden Zusätze mittlerweile überwiegend in Form vorgefertigter, vom einschlägigen Fachbedarfshandel zur Verfügung gestellter Feuchtwasserzusätze oder Feuchtmittelkonzentrate vorliegen und nur noch in Wasser gegeben oder mit Wasser verdünnt werden müssen.The fountain solution is usually prepared by the printer itself before the printing process, the modifying additives now being predominantly in the form of prefabricated fountain solution additives or dampening solution concentrates provided by the relevant specialist supply trade and only need to be added to water or diluted with water.
Für die im Offsetdruck einzusetzenden Feuchtmittel ist es überwiegend ein wesentliches Erfordernis, daß diese einen stabilen, im saueren Bereich liegenden pH-Wert, etwa zwischen pH 3 und pH 6, meist aber im Bereich zwischen pH 4 und pH 5,5, aufweisen. Dies wird normalerweise erreicht durch Puffersysteme auf Basis von Polycarbonsäuren bzw. Polyhydroxycarbonsäuren sowie deren Salze. Häufigstes Puffersystem ist Natriumcitrat/Zitronensäure.For the dampening solutions to be used in offset printing, it is predominantly an essential requirement that they have a stable pH value in the acidic range, for example between pH 3 and pH 6, but usually in the range between pH 4 and pH 5.5. This is normally achieved by using buffer systems based on polycarboxylic acids or polyhydroxycarboxylic acids and their salts. The most common buffer system is sodium citrate / citric acid.
Derartige Feuchtmittei können jedoch zu Korrosionserscheinungen an den mit ihnen in Berührung kommenden Teilen der Druckmaschinen führen, insbesondere an den Druckzylindern, die überwiegend aus Nickelmetall gefertigt sind oder eine Nickelbeschichtung aufweisen. Die Korrosionserscheinungen können sich hierbei in der Auflösung von Nickelmetall an den Zylinderoberflächen zeigen bis hin zu schweren Fällen von Lochfraß, vornehmlich in den Kontaktbereichen zwischen Druckplatten und Druckzylindern. Die Folge sind Dimensionsveränderungen, die die Qualität des Druckergebnisses negativ beeinflussen können, kürzere Standzeiten der Druckzylinder sowie verringerte Auflagen bis hin zu ernsten Schäden an den Druckmaschinen.However, such dampening agents can lead to signs of corrosion on the parts of the printing press that come into contact with them, in particular on the printing cylinders, which are predominantly made of nickel metal or have a nickel coating. The signs of corrosion can show up in the dissolution of nickel metal on the cylinder surfaces up to severe cases of pitting, primarily in the contact areas between the printing plates and the printing cylinders. The consequences are dimensional changes that can have a negative impact on the quality of the printing result, shorter downtimes of the printing cylinders and shorter runs, as well as serious damage to the printing press.
Dementsprechend hat es nicht an Versuchen gefehlt, die korrosiven Eigenschaften der Feuchtmittel durch die unterschiedlichsten Korrosionsinhibitoren zu reduzieren. So wurden den Feuchtmitteln beispielsweise organische Zinksalze wie Zinkgluconat und Zinkglucoheptonat, wasserlösliche anorganische Polyphosphate, Phenylarsonsäure und Derivate hiervon, Propargylverbindungen, Thioharnstoff und Derivate hiervon als Korrosionsinhibitoren zugesetzt. Gemäß der EP-108 883 soll sich durch den Zusatz von 1 H-Benzotriazol die Korrosion deutlich vermindern lassen. Wie aber dort angegeben und in eigenen Versuchen bestätigt, ist die Inhibitorwirkung von 1 H-Benzotriazol jedoch nur im relativ mild-saueren Milieu um pH 5 und höher einigermaßen ausreichend, bei Feuchtmitteln von niedrigerem pH-Wert jedoch ungenügend. Allen bekannten Korrosionsinhibitoren ist erfahrungsgemäß somit gemein, daß sie zwar einen gewissen Korrosionsschutz bewirken aber nicht, insbesondere nicht über einen breiteren pH-Bereich, die Korrosion vollständig unterbinden. Dies trifft insbesondere auch dann zu, wenn die Feuchtmittel mit demineralisiertem Wasser angesetzt wurden und einen pH-Wert von deutlich unter 5 aufweisen.Accordingly, there has been no lack of attempts to reduce the corrosive properties of the dampening solution by means of a wide variety of corrosion inhibitors. For example, organic zinc salts such as zinc gluconate and zinc glucoheptonate, water-soluble inorganic polyphosphates, phenylarsonic acid and derivatives thereof, propargyl compounds, thiourea and derivatives thereof were added to the dampening solutions as corrosion inhibitors. According to EP-108 883, the addition of 1 H-benzotriazole is said to significantly reduce corrosion. However, as stated there and confirmed in our own experiments, the inhibitory effect of 1 H-benzotriazole is only reasonably sufficient only in a relatively mildly acidic environment around pH 5 and higher, but is inadequate for dampening solutions with a lower pH. Experience has shown that all known corrosion inhibitors have in common that although they do not provide a certain level of protection against corrosion, in particular not over a broad pH range, they completely prevent corrosion. This is especially true if the dampening solution has been mixed with demineralized water and has a pH value of well below 5.
Es bestand somit in der Druckindustrie weiterhin ein besonderes Bedürfnis an Feuchtmitteln für den Offsetdruck mit zumindest deutlich reduzierten Korrosionseigenschaften.There was therefore still a particular need in the printing industry for dampening solutions for offset printing with at least significantly reduced corrosion properties.
Überraschend wurde nun gefunden, daß Feuchtmittel von an sich bekannter Zusammensetzung praktisch keinerlei Korrosionswirkung auf Nickelmetall zeigen, wenn sie einen Gehalt an Kupferionen aufweisen. Hierbei spielt, wie sich in zahlreichen Versuchen zeigte, die Menge an Kupferionen im gebrauchsfertigen Feuchtmittel keine wesentliche Rolle, sondern vielmehr die Tatsache ihres Vorliegens an sich. Völlig unverhersehbar war, daß schon geringste Mengen an Kupferionen im gebrauchsfertigen Feuchtmittel, etwa in der Größenordnung um 0,1 ppm, eine erhebliche Reduzierung des Nickelabtrags bewirken. Desweiteren konnte festgestellt werden, daß eine Verstärkung der korrosionsinhibierenden Wirkung bei zusätzlicher Anwesenheit von Silikationen, etwa in der Größenordnung von 1 - 1000 ppm, eintritt.Surprisingly, it has now been found that dampening solutions of a composition known per se show practically no corrosion action on nickel metal if they contain copper ions. Here, as has been shown in numerous experiments, the amount of copper ions in the ready-to-use fountain solution does not play an important role, but rather the fact that they are present per se. It was completely unpredictable that even the smallest amounts of copper ions in the ready-to-use dampening solution, approximately in the order of magnitude of 0.1 ppm, bring about a significant reduction in the nickel removal. Furthermore, it was found that an increase in the corrosion-inhibiting effect occurs with the additional presence of silications, approximately in the order of magnitude of 1 to 1000 ppm.
Gegenstand der Erfindung sind somit Feuchtmittel bzw. Feuchtmittelkonzentrate für den Offsetdruck, die einen Gehalt von 0,01 - 100 ppm, vorzugsweise 0,1 - 10 ppm, bzw. von 0,1 - 1000 ppm, vorzugsweise 1 - 500 ppm, an Kupferionen aufweisen.The invention thus relates to dampening solutions or dampening solution concentrates for offset printing which have a copper ion content of 0.01-100 ppm, preferably 0.1-10 ppm, or 0.1-1000 ppm, preferably 1-500 ppm exhibit.
Gegenstand der Erfindung sind weiterhin Feuchtmittel bzw. Feuchtmittelkonzentrate für den Offsetdruck, die darüberhinaus noch einen Gehalt an Silikationen aufweisen.The invention further relates to dampening solutions or dampening solution concentrates for offset printing, which also have a silicate content.
Gegenstand der Erfindung ist darüberhinaus ein Verfahren zur Verhinderung von durch Feuchtmittel verursachte Korrosionserscheinungen an Offsetdruckmaschinen, bei dem den zu verwendeten Feuchtmitteln bzw. ihren Konzentraten Kupferionen zugesetzt werden.The invention also relates to a method for preventing corrosion phenomena caused by dampening solutions on offset printing presses, in which copper ions are added to the dampening solutions used or their concentrates.
Gegenstand der Erfindung ist schließlich die Verwendung von Kupferionen in einer Konzentration von 0,01 - 100 ppm als antikorrosiver Zusatz in Feuchtmitteln für den Offsetdruck.Finally, the invention relates to the use of copper ions in a concentration of 0.01-100 ppm as an anti-corrosive additive in dampening solutions for offset printing.
Aus US-Patent 3 908 547 sind Hydrophilisierungsmittel bekannt, mit deren Hilfe durch entsprechende Vorbehandlung normalerweise für den Trockenkopiervorgang vorgesehene, elektrophotographisch sensibilisierte Zinkoxidschichten auch im Klein-Offsetdruck eingesetzt werden können. Dies Mittel basieren auf speziellen Metallsalzlösungen und können unter anderem auch Kupfersalze enthalten. Sie können in Verdünnung bei dieser spezifischen Anwendung auch als Feuchtmittel eingesetzt werden. In jedem Fall liegen hier die Mindestkonzentrationen an Metallsalz um mindestens eine Zehnerpotenz über der Maximalkonzentration für Kupfer in den erfindungsgemäßen Feuchtmitteln. Eine antikorrosive Wirkung bedingt durch den eventuellen Kupfergehaft ist dieser Druckschrift nicht zu entnehmen.From US Pat. No. 3,908,547, hydrophilizing agents are known, with the aid of which, by means of appropriate pretreatment, electrophotographically sensitized zinc oxide layers normally provided for the dry copying process can also be used in small offset printing. These agents are based on special metal salt solutions and can also contain copper salts. They can also be used as a dampening solution in this specific application. In any case, the minimum concentrations of metal salt are at least a power of ten above the maximum concentration for copper in the dampening solutions according to the invention. This pressure is an anti-corrosive effect due to the possible copper content font not to be extracted.
Durch den erfindungsgemäßen Zusatz von schon geringsten Mengen an Kupferionen, etwa in Form wasserlöslicher Kupfersalze, kann die korrosive Wirkung auf Nickelmetall aller im Offsetdruck verwendeten Feuchtmittel beliebiger Zusammensetzung drastisch reduziert bis praktisch gänzlich unterbunden werden. Als in jedem Falle effektiv haben sich Gehalte von 0,01 - 100 ppm, vorzugsweise 0,1 - 10 ppm an Kupferionen im gebrauchsfertigen Feuchtmittel erwiesen. So bewirkt beispielsweise ein Gehalt von nur 0,1 ppm an Kupferionen im gebrauchsfertigen Feuchtmittel eine Reduktion des Nickelabtrags um ca. 90 % im Vergleich mit einem entsprechenden Feuchtmittel, das keinerlei Korrosionsinhibitoren enthält. Der aus der EP-108 883 bekannte Korrosionsinhibitor iH-Benzotriazol bewirkt stattdessen in der um mehrere Zehnerpotenzen höheren Konzentration von 0,01 % (_ 100 ppm) nur eine Reduktion des Nickelabtrags um etwa 60 %. Höhere Gehalte an Kupferionen im gebrauchsfertigen Feuchtmittel, etwa in der Größenordnung von 1 - 10 ppm, sind noch effektiver. Noch höhere Konzentrationen sind in der Regel aber nicht wirtschaftlich. Praktisch vollständig unterbunden wird der Nickelabtrag wenn das Feuchtmittel zusätzlich noch Silikationen, etwa in der Größenordnung 1 - 1000 ppm, vorzugsweise 10 - 500 ppm, enthält.By adding even the smallest amounts of copper ions according to the invention, for example in the form of water-soluble copper salts, the corrosive effect on nickel metal of all dampening solutions of any composition used in offset printing can be drastically reduced or practically completely prevented. In every case, contents of 0.01-100 ppm, preferably 0.1-10 ppm, of copper ions in the ready-to-use dampening solution have proven to be effective. For example, a copper ion content of only 0.1 ppm in the ready-to-use dampening solution results in a reduction of the nickel removal by approx. 90% in comparison with a corresponding dampening solution which does not contain any corrosion inhibitors. Instead, the corrosion inhibitor iH-benzotriazole known from EP-108 883, in the concentration of 0.01% ( _ 100 ppm), which is several orders of magnitude higher, only results in a reduction of the nickel removal by about 60%. Higher levels of copper ions in the ready-to-use fountain solution, for example in the order of 1 - 10 ppm, are even more effective. However, even higher concentrations are generally not economical. The removal of nickel is practically completely prevented if the dampening solution additionally contains silications, of the order of magnitude of 1 to 1000 ppm, preferably 10 to 500 ppm.
Die zur Korrosionsverhinderung erforderlichen Mengen an Kupferionen sowie gegebenenfalls an Silikationen können in Form entsprechender Salze den gebrauchsfertigen Feuchtmitteln üblicher Zusammensetzung vor dem eigentlichen Einsatz im Druckvorgang zugesetzt werden. Prinzipiell geeignet sind alle Kupfersalze, die problemlos wasserlöslich sind und im wäßrigen Medium Kupferionen freisetzen. Analoges gilt für die einzusetzenden Silikatverbindungen. Gut geeignete Kupfersalze sind beispielsweise Kupfersulfat, Kupfernitrat, Kupferacetat und Kupferchlorid. Bevorzugte Sifikationenlieteranten sind etwa Alkalimetallsilikate wie Natronwasserglas und Kaliwasserglas.The amounts of copper ions and, if necessary, of silications required to prevent corrosion can be added in the form of corresponding salts to the ready-to-use dampening solutions of the usual composition before the actual use in the printing process. In principle, all copper salts that are readily water-soluble and release copper ions in an aqueous medium are suitable. The same applies to the silicate compounds to be used. Suitable copper salts are, for example, copper sulfate, copper nitrate, copper acetate and copper chloride. Preferred suppliers are about alkali metal silicates such as sodium water glass and potassium water glass.
Vorteilhaft und üblich ist die Zubereitung des Feuchtmittels unmittelbar vor dem Gebrauch im Offsetdruck aus entsprechenden Feuchtmittelkonzentraten und Wasser. Feuchtmittelkonzentrate sind üblicherweise konzentrierte wäßrige Lösungen, gelegentlich aber auch feste, pulver-, tabletten- bzw. pastenförmige Produkte, die die für Feuchtmittel im Offsetdruck erforderlichen Zusatzstoffe enthalten. Aus diesen Konzentraten werden die gebrauchsfertigen Feuchtmittel hergestellt durch Verdünnen bzw. Lösen in Wasser zu etwa 1 - 10 %-igen, vorzugsweise 2 - 5 %-igen Lösungen. Aufgrund der örtlich unterschiedlichen und häufig variierenden Brauchwasserqualitäten und deren erfahrungsgemäß schwer kalkulierbaren Einflüsse über die Feuchtmittel auf das Druckergebnis empfiehlt es sich, bei Zubereitung der Feuchtmittel aufbereitetes Wasser, vorzugsweise demineralisiertes oder Wasser der Härte 8 - 12°dH, zu verwenden.It is advantageous and customary to prepare the dampening solution immediately before use in offset printing from appropriate dampening solution concentrates and water. Fountain solution concentrates are usually concentrated aqueous solutions, but occasionally also solid, powder, tablet or pasty products, which contain the additives required for fountain solutions in offset printing. The ready-to-use dampening solutions are prepared from these concentrates by diluting or dissolving them in water to give about 1-10%, preferably 2-5%, solutions. Due to the locally differing and frequently varying process water qualities and their experience with the dampening solution, which is difficult to calculate, it is advisable to use treated water, preferably demineralized water or hardness 8 - 12 ° dH, when preparing the dampening solution.
Die Feuchtmittelkonzentrate enthalten im allgemeinen in meist empirisch ermittelten, oft unterschiedlichen Anteilen die verschiedensten die Eigenschaften des Feuchtmittels steuernden Substanzen. Praktisch immer enthalten sie pH-Regulantien, die üblicherweise einen pH-Wert im Bereich von etwa 3 - 6, meist um pH 5 bewirken. Überwiegend werden Citratpuffer hierfür verwendet. Desweiteren können diese Konzentrate enthalten Feuchthaltemittel, meist auf Basis von Polyalkoholen wie Glycole, Glycerin, Sorbit, Hexit oder Polyglycole, Filmbildner wie Gummi arabicum, Netzmittel wie etwa kationenaktive, anionenaktive, nichtionogene oder amphotere Tenside, bevorzugt nichtionogene Tenside, sowie häufig auch Enthärtungsmittel beispielsweise Komplexbildner wie EDTA. Darüberhinaus enthalten diese Konzentrate zwecks Haltbarmachung meist noch handelsübliche Konservierungsmittel, die antimikrobiell und/oder antimykotisch wirken. Häufig enthalten derartige Feuchtmittelkonzentrate zwecks gleichmäßiger Lösung der unterschiedlichen Inhaltsstoffe noch lösungsvermittelnde Substanzen wie beispielsweise wasserkompatible organische Lösungsmittel, meist Alkohole wie Methanol, Ethanol oder Isopropanol.The dampening solution concentrates generally contain, in mostly empirically determined, often different proportions, the most diverse substances controlling the properties of the dampening solution. They practically always contain pH regulators, which usually bring about a pH in the range of about 3 - 6, usually around pH 5. Citrate buffers are mainly used for this. Furthermore, these concentrates can contain humectants, mostly based on polyalcohols such as glycols, glycerol, sorbitol, hexitol or polyglycols, film formers such as gum arabic, wetting agents such as cationic, anionic, nonionic or amphoteric surfactants, preferably nonionic surfactants, and often also softening agents, for example complexing agents like EDTA. In addition, for the purpose of preservation, these concentrates usually still contain commercially available preservatives which have an antimicrobial and / or antifungal effect. Often, such dampening solution concentrates also contain solubilizing substances such as, for example, water-compatible organic solvents, mostly alcohols such as methanol, ethanol or isopropanol, for the purpose of uniform dissolution of the different ingredients.
Erfindungsgemäß können vorteilhaft nun auch solche Feuchtmittelkonzentrate mit den erforderlichen Quanten an Kupferionen bzw., falls erforderlich, auch an Silikationen zur Korrosionsverhinderung versetzt werden. In diesen Konzentraten beträgt der Gehalt an Kupferionen etwa 0,1 - 1000 ppm, vorzugsweise 1 - 500 ppm, und der Gehalt an Silikationen 10 - 10000 ppm, vorzugsweise 100 - 5000 ppm. Typische erfindungsgemäße Feuchtmittelkonzentrate enthalten beispielsweise 5 - 15 Gew.-%, vorzugsweise um 10 Gew.-% Glycerin, 2 - 10 Gew.-%, vorzugsweise um etwa 5 Gew.-% Citratpuffer, 1 - 5 Gew.-%, vorzugsweise etwa 3 Gew.-% Gummi arabicum, etwa 1 Gew.-% Konservierungsmittel, 3 - 10 Gew.-%, vorzugsweise etwa 5 Gew.-% Isopropanol sowie 0,0001 - 0,05 Gew.-% Kupfernitrat (entsprechend etwa 1 - 500 ppm Kupferionen) und gegebenenfalls 0,01 - 0,5 Gew.-% Natriumsilikat (entsprechend etwa 100 - 5000 ppm Silikationen).According to the invention, such dampening solution concentrates with the necessary quanta of copper ions or, if necessary, also of silications can also be advantageously added to prevent corrosion. In these concentrates, the copper ion content is about 0.1-1000 ppm, preferably 1-500 ppm, and the silicate content is 10-10000 ppm, preferably 100-5000 ppm. Typical dampening solution concentrates according to the invention contain, for example, 5-15% by weight, preferably around 10% by weight glycerol, 2-10% by weight, preferably around 5% by weight citrate buffer, 1-5% by weight, preferably approximately 3% by weight gum arabic, about 1% by weight of preservative, 3 - 10% by weight, preferably about 5% by weight of isopropanol and 0.0001 - 0.05% by weight of copper nitrate (corresponding to about 1 - 500 ppm copper ions) and optionally 0.01-0.5% by weight sodium silicate (corresponding to approximately 100-5000 ppm silications).
Der Fachwelt stehen nunmehr Feuchtmittelkonzentrate zur Bereitung von Feuchtmitteln für den Offsetdruck zur Verfügung, die durch den erfindungsmäßen Gehalt an Kupferionen praktisch keine Korrosionswirkung an den damit in Berührung kommenden Teilen der Offsetdruckmaschinen, insbesondere an den aus Nickelmetall gefertigten Druckzylindern, zeigen.The specialist world now has dampening solution concentrates available for the preparation of dampening solutions for offset printing which, due to the copper ion content according to the invention, show practically no corrosion effect on the parts of the offset printing machines that come into contact therewith, in particular on the printing cylinders made of nickel metal.
Es wurde zunächst ein Feuchtmittelkonzentrat bereitet wie in Beispiel 1, jedoch ohne Kupfernitrat. Hieraus wurden dann eine Reihe von Feuchtmitteln in Form 4 %-iger wäßriger Lösungen hergestellt. Diesem Feuchtmittel wurden dann, zum Teil in unterschiedlichen Konzentrationen, erfindungsgemäße sowie bekannte Korrosionsinhibitoren zugesetzt.A dampening solution concentrate was first prepared as in Example 1, but without copper nitrate. A series of dampening solutions in the form of 4% aqueous solutions were then produced from this. Corrosion inhibitors according to the invention and known corrosion inhibitors were then added to this dampening solution, partly in different concentrations.
In diese Probelösungen wurden dann Nickelrohre von 3 cm Durchmesser ca. 4 cm tief eingetaucht und über längere Zeit hinweg der Einwirkung der gerührten jeweiligen Lösung ausgesetzt.Nickel tubes of 3 cm in diameter were then immersed in these sample solutions to a depth of approximately 4 cm and exposed to the action of the respective solution in question for a relatively long time.
Durch periodische Präzinsionsrückwägung der Nickelrohre sowie quantitative Bestimmung des Nickelgehaftes der Lösungen wurde als Maß für die Korrosivität der durchschnittliche Nickelabtrag in Gramm pro Quadratmeter und Tag ermittelt. Die nachfolgende Tabelle 1 zeigt die Ergebnisse.
Gegenüber der Feuchtmittelprobe ohne Korrosionsinhibitor (Nr. 1) führt der erfindungsgemäße Zusatz von Kupferionen (Lösungen Nr. 5 bis 8) zu einer Reduktion des Nickelabtrags um etwa 88 - 93 %.Compared to the dampening solution sample without corrosion inhibitor (No. 1), the addition of copper ions according to the invention (solutions No. 5 to 8) leads to a reduction in the nickel removal by about 88-93%.
Die erfindungsgemäße Kombination von Kupferionen und Silikationen (Nr. 9) führt zu einer Reduktion des Nickelabtrags um 96 %, während die Anwesenheit von Silikat alleine (Nr. 10) nur eine Reduktion um etwa 30 % bewirkt.The combination of copper ions and silications (No. 9) according to the invention leads to a reduction of the nickel removal by 96%, while the presence of silicate alone (No. 10) only brings about a reduction by about 30%.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3536485 | 1985-10-12 | ||
| DE19853536485 DE3536485A1 (en) | 1985-10-12 | 1985-10-12 | DAMPENER FOR OFFSET PRINTING |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0219719A1 EP0219719A1 (en) | 1987-04-29 |
| EP0219719B1 true EP0219719B1 (en) | 1990-01-17 |
Family
ID=6283462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86113359A Expired - Lifetime EP0219719B1 (en) | 1985-10-12 | 1986-09-29 | Fountain solution for lithographic printing |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4798627A (en) |
| EP (1) | EP0219719B1 (en) |
| JP (1) | JPS6295292A (en) |
| DE (2) | DE3536485A1 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3830467A1 (en) * | 1988-09-08 | 1990-03-15 | Hoechst Ag | DAMPENER FOR OFFSET PRINTING |
| US4935058A (en) * | 1989-04-14 | 1990-06-19 | Core-Guard Industries, Inc. | Coating composition to prevent corrosion on metals |
| JP2662828B2 (en) * | 1990-10-25 | 1997-10-15 | 富士写真フイルム株式会社 | Lithographic fountain solution composition and lithographic printing method |
| US5366784A (en) * | 1991-02-26 | 1994-11-22 | Herbison Paul R | Corrosion inhibiting offset printing blanket |
| JPH0796344B2 (en) * | 1991-03-22 | 1995-10-18 | 東洋インキ製造株式会社 | Additive for planographic dampening water and its use |
| DE4220550A1 (en) * | 1991-07-04 | 1993-01-14 | Hostmann Steinberg Gmbh | FUMENT LIQUID CONCENTRATE AND FUMENT LIQUID AND THEIR USE IN THE OFFSET PRINTING PROCESS |
| US5256190A (en) * | 1992-03-16 | 1993-10-26 | Barth Thomas M | Universal chemical system for offset printing |
| DE19719936A1 (en) * | 1997-05-13 | 1998-11-19 | Fogra Forschungsgesellschaft D | Dampening solution for offset printing |
| US6488754B2 (en) | 2000-11-29 | 2002-12-03 | Grain Processing Corporation | Lithographic dampening solution and method for dampening a lithographic plate |
| DE10238874A1 (en) * | 2002-08-24 | 2004-03-04 | Koenig & Bauer Ag | Printing forme wetting method for sheet-fed offset rotary printing machine, by measuring salt content in central wetting agent reservoir and supplying water accordingly |
| DE102004017054A1 (en) * | 2004-04-07 | 2005-10-27 | Koenig & Bauer Ag | Printing form moistening method for offset rotation printing machine, involves desalting part of medium extracted for additional quantity of fresh water, and supplying desalted medium to container when salt content of medium exceeds target |
| JP5343575B2 (en) * | 2009-01-20 | 2013-11-13 | 凸版印刷株式会社 | Dampening water quantitative dilution device for offset printing |
| JP5571009B2 (en) * | 2011-01-28 | 2014-08-13 | 三菱製紙株式会社 | Printing method of heat-sensitive lithographic printing plate |
| ES2743607T3 (en) | 2015-04-28 | 2020-02-20 | Sicpa Holding Sa | Environmentally friendly moisturizing solution for wet offset printing process and wet offset printing process |
| TW201708435A (en) | 2015-07-01 | 2017-03-01 | 西克帕控股有限公司 | Environmentally friendly ink and fountain solution for wet offset printing process and wet offset printing process |
| CN108819452B (en) * | 2018-05-15 | 2020-01-21 | 苏州市新世纪彩印有限公司 | Printing fountain solution |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2250508A (en) * | 1936-06-15 | 1941-07-29 | John S Thompson | Treating zinc with organic acids |
| US2219977A (en) * | 1936-09-16 | 1940-10-29 | Firm Mannesmann Stahlblechbau | Process for producing coatings on zinc and galvanized articles |
| US2412200A (en) * | 1941-09-12 | 1946-12-10 | Jr Robert D Blum | Hectograph mass |
| US2978361A (en) * | 1954-03-19 | 1961-04-04 | Degussa | Process for the surface treatment of metals |
| US3257941A (en) * | 1960-04-04 | 1966-06-28 | Anken Chemical And Film Corp | Method and means of making planographic printing plates |
| US3284249A (en) * | 1963-06-28 | 1966-11-08 | Anaconda American Brass Co | Decorative finish for copper |
| DE1622360C3 (en) * | 1968-02-22 | 1978-06-15 | Hoechst Ag, 6000 Frankfurt | Process for hydrophilization |
| JPS53104301A (en) * | 1977-02-22 | 1978-09-11 | Ricoh Kk | Treating solution for lithographic printing |
| US4340509A (en) * | 1978-03-24 | 1982-07-20 | Michael A. Canale | Composition, concentrate and fountain solution for lithographic printing operations |
| DE3473890D1 (en) * | 1983-07-25 | 1988-10-13 | Hitachi Ltd | Electroless copper plating solution |
-
1985
- 1985-10-12 DE DE19853536485 patent/DE3536485A1/en not_active Withdrawn
-
1986
- 1986-09-29 EP EP86113359A patent/EP0219719B1/en not_active Expired - Lifetime
- 1986-09-29 DE DE8686113359T patent/DE3668282D1/en not_active Expired - Fee Related
- 1986-10-08 JP JP61238184A patent/JPS6295292A/en active Pending
- 1986-10-14 US US06/918,245 patent/US4798627A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6295292A (en) | 1987-05-01 |
| DE3668282D1 (en) | 1990-02-22 |
| US4798627A (en) | 1989-01-17 |
| DE3536485A1 (en) | 1987-04-16 |
| EP0219719A1 (en) | 1987-04-29 |
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