EP0108883B1 - Process for corrosion inhibition of printing machine cylinders - Google Patents

Process for corrosion inhibition of printing machine cylinders Download PDF

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Publication number
EP0108883B1
EP0108883B1 EP83108957A EP83108957A EP0108883B1 EP 0108883 B1 EP0108883 B1 EP 0108883B1 EP 83108957 A EP83108957 A EP 83108957A EP 83108957 A EP83108957 A EP 83108957A EP 0108883 B1 EP0108883 B1 EP 0108883B1
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EP
European Patent Office
Prior art keywords
printing
corrosion
benzotriazole
printing machine
dampening
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.)
Expired
Application number
EP83108957A
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German (de)
French (fr)
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EP0108883A3 (en
EP0108883A2 (en
Inventor
Werner Dr.-Ing. Sondergeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Priority to AT83108957T priority Critical patent/ATE39336T1/en
Publication of EP0108883A2 publication Critical patent/EP0108883A2/en
Publication of EP0108883A3 publication Critical patent/EP0108883A3/en
Application granted granted Critical
Publication of EP0108883B1 publication Critical patent/EP0108883B1/en
Expired legal-status Critical Current

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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 invention relates to a compound of formula 1 H-benzotriazole.
  • the flat printing process is based on the different wetting properties of printing ink and fountain solution. Influencing factors from a wide variety of problem areas, such as B. different dampening systems, printing plates, substrates and colors affect the printing process. A wide variety of fountain solution additives are known. The correct use of the fountain solution additives means an improvement in economy.
  • DE-PS 599 435 it is known to prevent the oxidation and corrosion of a zinc printing plate by means of color additives such as diammonium phosphate and thus to make this plate suitable for use in dry flat printing. It is also known from DE-PS 653 204 to add ammonium nitrate and ammonium phosphate to the dampening solution for metal planographic printing plates.
  • DE-OS 2 914 255 it is known from DE-OS 2 914 255 to coat the surfaces of sheet-guiding cylinders to protect against the harmful effects of the materials used for printing and cleaning.
  • Inhibitors to slow the rate of corrosion of metals are known.
  • the addition dicyandiamide cyanguanidine (C 2 H 4 N 4 ) is described as a good inhibitor for steel, aluminum and nickel in the journal Metall Chemistry 33 (1979), page 112.
  • this inhibitor has not proven itself for the present problem.
  • the object of the invention is to find a method by which the corrosion phenomena occurring in offset printing machines, especially on the cylinders, is prevented.
  • a possibility is to be found to prevent the corrosion of nickel-plated cylinders.
  • the object is achieved in that the compound 1 H-benzotriazole is used.
  • the addition of 1 H-benzotriazole has proven to be particularly effective for protecting nickel-plated cylinder surfaces. Surprisingly, the corrosion protection is complete at pH 5.5 and above. However, this is precisely a pH value that is preferably set for dampening solutions in the practice of offset printing.
  • the additive or inhibitor 1 H-benzotriazole shows in a particularly advantageous manner no side effects on the properties and function of the printing plate and on the printability and drying of the printing ink.
  • the inhibitor also has no harmful effects on the printing paper.
  • 1 H-benzotriazole is colorless and does not change the color of the printing paper.
  • the inhibitor does not affect the other components of the dampening solution and their effects.
  • Components are e.g. B. buffer system, means for reducing the surface tension, and antimicrobial additives.
  • B. buffer system means for reducing the surface tension
  • antimicrobial additives Especially when commissioning large offset printing presses with a central fountain solution, it has been shown that fountain additives have to have an antimicrobial effect.
  • the 1 shows a dampening unit 1 with a water tank 2 in the area of a plate cylinder 3.
  • the plate cylinder 3 has a surface 4.1 on which a pressure plate rests.
  • the water tank 2 is arranged in the central axis position of the plate cylinder 3. From the water tank 2 lead 8 and return lines 9 to a dosing and tempering 6, which is filled via an inlet valve 13.
  • a pump 10 doses the liquid from the reservoir 6 into the water tank 2.
  • the liquid is supplied via the inlet valve 13 from a water reservoir 5.
  • a water pipe 14 fills the water reservoir 5 as required.
  • a surface 4 of the printing cylinder 17 can depending on the surface finish z. B. be nickel-plated.
  • the liquid transfer to the pressure cylinder 17 takes place from the dampening unit 1.1. Here the liquid passes through a plate cylinder 3.1. From there, the liquid passes from below via a rubber cylinder 16.1 to the pressure cylinder 17 and thus enables the above-mentioned formation of corrosion.

Abstract

1. Use of 1H-benzotriazole as an additive for the damping agent isued in planographic printing processes with the object of protecting cylinder surfaces of nickel from corrosion.

Description

Die Erfindung betrifft eine Verbindung der Formel 1 H-Benzotriazol.The invention relates to a compound of formula 1 H-benzotriazole.

Das Flachdruckverfahren beruht auf den unterschiedlichen Benetzungseigenschaften von Druckfarbe und Feuchtwasser. Dabei wirken sich Einflußgrößen aus den unterschiedlichsten Problembereichen, wie z. B. unterschiedlichen Feuchtwerken, Druckplatten, Bedruckstoffen sowie Farben sich auf den Druckprozeß aus. Es sind die unterschiedlichsten Feuchtwasserzusätze bekannt. Der richtige Einsatz der Feuchtwasserzusätze bedeutet eine Verbesserung der Wirtschaftlichkeit.The flat printing process is based on the different wetting properties of printing ink and fountain solution. Influencing factors from a wide variety of problem areas, such as B. different dampening systems, printing plates, substrates and colors affect the printing process. A wide variety of fountain solution additives are known. The correct use of the fountain solution additives means an improvement in economy.

Durch die DE-PS 599 435 ist es bekannt, durch Farbzusätze wie Diammoniumphosphat die Oxydation und Korrosion einer Zinkdruckplatte zu verhindern und diese Platte damit für die Verwendung im Trockenflachdruck geeignet zu machen. Ebenso ist es durch die DE-PS 653 204 bekannt, dem Feuchtmittel für Metallflachdruckformen Ammoniumnitrat und Ammoniumphosphat zuzufügen.From DE-PS 599 435 it is known to prevent the oxidation and corrosion of a zinc printing plate by means of color additives such as diammonium phosphate and thus to make this plate suitable for use in dry flat printing. It is also known from DE-PS 653 204 to add ammonium nitrate and ammonium phosphate to the dampening solution for metal planographic printing plates.

Weiterhin ist es durch die DE-OS 2 914 255 bekannt, die Oberflächen von bogenführenden Zylindern zum Schutz vor den schädlichen Einflüssen der zum Drucken und Reinigen angewendeten Stoffe zu beschichten.Furthermore, it is known from DE-OS 2 914 255 to coat the surfaces of sheet-guiding cylinders to protect against the harmful effects of the materials used for printing and cleaning.

Die Schwierigkeiten und Nachteile bei Verwendung von Feuchtwasser werden in der DE-PS 653 204 aufgezeigt.The difficulties and disadvantages when using dampening water are shown in DE-PS 653 204.

Inhibitoren zur Verlangsamung der Korrossionsgeschwindigkeit von Metallen sind bekannt. So ist in der Zeitschrift Metalloberfläche 33 (1979), Seite 112 der Zusatz Dicyandiamid = Cyanguanidin (C2H4N4) als guter Inhibitor für Stahl, Aluminium und Nickel beschrieben. Die Verwendung dieses Inhibitors hat sich aber für das vorliegende Problem nicht bewährt.Inhibitors to slow the rate of corrosion of metals are known. For example, the addition dicyandiamide = cyanguanidine (C 2 H 4 N 4 ) is described as a good inhibitor for steel, aluminum and nickel in the journal Metallfläche 33 (1979), page 112. However, the use of this inhibitor has not proven itself for the present problem.

In der Zeitschrift « Corrosion •, Vol. 32, Nr. 11, Nov. 76, wurde der Stoff Benzotriazol als Korrosionsinhibitor für Nickel und Nickeleisenlegierung untersucht. Die Untersuchungen wurden in 1 N H2S04 (pH 0,3) durchgeführt.In the magazine "Corrosion •, Vol. 32, No. 11, Nov. 76, the substance benzotriazole was investigated as a corrosion inhibitor for nickel and nickel iron alloy. The investigations were carried out in 1 NH 2 SO 4 (pH 0.3).

Weiterhin ist es aus Ullmann's Encyklopädie der technischen Chemie, 4. Auflage, Band 10, Seite 125 bekannt, Benzotriazol gelegentlich als Korrosionsinhibitor zu verwenden.Furthermore, it is known from Ullmann's Encyclopedia of Industrial Chemistry, 4th edition, volume 10, page 125 that benzotriazole is occasionally used as a corrosion inhibitor.

Ausgehend von diesem Stand der Dinge liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zu finden, durch das die bei Offsetdruckmaschinen auftretenden Korrosionserscheinungen vor allem an den Zylindern verhindert wird. Insbesondere soll eine Möglichkeit gefunden werden, die Korrosion von vernickelten Zylindern zu verhindern.Based on this state of the art, the object of the invention is to find a method by which the corrosion phenomena occurring in offset printing machines, especially on the cylinders, is prevented. In particular, a possibility is to be found to prevent the corrosion of nickel-plated cylinders.

Die Lösung der gestellten Aufgabe wird erfindungsgemäß dadurch erreicht, daß die Verbindung 1 H-Benzotriazol verwendet wird. Besonders wirksam hat sich der Zusatz von 1 H-Benzotriazol zum Schutz von vernickelten Zylinderoberflächen erwiesen. Überraschenderweise ist der Korrosionsschutz bei einem pH-Wert von 5,5 und größer vollständig. Dies ist aber gerade ein PH-Wert, der bevorzugt für Feuchtmittel in der Praxis des Offsetdruckes eingestellt wird.The object is achieved in that the compound 1 H-benzotriazole is used. The addition of 1 H-benzotriazole has proven to be particularly effective for protecting nickel-plated cylinder surfaces. Surprisingly, the corrosion protection is complete at pH 5.5 and above. However, this is precisely a pH value that is preferably set for dampening solutions in the practice of offset printing.

Die vorteilhafte Wirkung des 1H-Benzotriazol als Zusatz tritt auch bei einem pH-Wert kleiner als 5,0 auf, hierbei ergibt sich eine Verminderung der Korrosion an den vernickelten Oberflächen der Druckmaschine um einen Faktor 7. Bei Gußoberflächen ergibt sich bei pH 5,5 eine Verminderung der Korrosion um 20 %.The advantageous effect of 1H-benzotriazole as an additive also occurs at a pH value of less than 5.0, which results in a reduction in corrosion on the nickel-plated surfaces of the printing press by a factor of 7. In the case of cast surfaces, this results in pH 5.5 a 20% reduction in corrosion.

Der Zusatz, bzw. Inhibitor 1 H-Benzotriazol zeigt in besonders vorteilhafter Weise keine Nebenwirkungen auf die Eigenschaften und Funktion der Druckplatte, sowie auf die Verdruckbarkeit und Trocknung der Druckfarbe.The additive or inhibitor 1 H-benzotriazole shows in a particularly advantageous manner no side effects on the properties and function of the printing plate and on the printability and drying of the printing ink.

Ebenso hat der Inhibitor keine schädlichen Einflüsse auf das Druckpapier. 1 H-Benzotriazol ist farblos und verändert die vorliegende Farbe des Druckpapieres nicht.The inhibitor also has no harmful effects on the printing paper. 1 H-benzotriazole is colorless and does not change the color of the printing paper.

Weiterhin beeinträchtigt der Inhibitor nicht die anderen Komponenten des Feuchtmittels und deren Wirkungen. Komponenten sind z. B. Puffersystem, Mittel zur Reduzierung der Oberflächenspannung, sowie antimikrobielle Zusätze. Gerade bei der Inbetriebnahme von großen Offsetdruckmaschinen mit zentraler Feuchtwasserversorgung hat sich gezeigt, daß Feuchtwasserzusätze antimikrobiell wirken müssen, d. h. das Feuchtwasser konservieren, denn Feuchtwasser sind allgemein gute Nährböden für Mikroorganismen.Furthermore, the inhibitor does not affect the other components of the dampening solution and their effects. Components are e.g. B. buffer system, means for reducing the surface tension, and antimicrobial additives. Especially when commissioning large offset printing presses with a central fountain solution, it has been shown that fountain additives have to have an antimicrobial effect. H. preserve the fountain solution, because fountain solutions are generally good breeding grounds for microorganisms.

Weitere Vorteile und wesentliche Merkmale der Erfindung gehen aus den Unteransprüchen und der beigefügten Beschreibung in Verbindung mit den schematisch dargestellten Ausführungsbeispielen hervor.Further advantages and essential features of the invention emerge from the subclaims and the attached description in connection with the schematically illustrated exemplary embodiments.

Es zeigen :

  • Fig. 1 einen Detailausschnitt eines Feuchtwerkes innerhalb einer Druckmaschine,
  • Fig. 2 eine Seitenansicht der gesamten Druckmaschine mit der Anordnung der Zylinder und Farb- und Feuchtwerken.
Show it :
  • 1 shows a detail of a dampening unit within a printing press,
  • Fig. 2 is a side view of the entire printing press with the arrangement of the cylinders and inking and dampening units.

Fig. 1 zeigt ein Feuchtwerk 1 mit einem Wasserkasten 2 im Bereich eines Plattenzylinders 3. Der Plattenzylinder 3 weist eine,Oberfläche 4.1 auf, an der eine Druckplatte anliegt. In Achsenmittellage des Plattenzylinders 3 ist der Wasserkasten 2 angeordnet. Vom Wasserkasten 2 führen Vor- 8 und Rücklaufleitungen 9 zu einem Dosier- und Temperiervorlagebehälter 6, der über ein Einlaßventil 13 befüllt wird. Eine Pumpe 10 dosiert die Flüssigkeit vom Vorlagebehälter 6 in den Wasserkasten 2. Der Zulauf der Flüssigkeit über das Einlaßventil 13 erfolgt aus einem Wasservorlagebehälter 5. Eine Wasserleitung 14 füllt je nach Bedarf den Wasservorlagebehälter 5.1 shows a dampening unit 1 with a water tank 2 in the area of a plate cylinder 3. The plate cylinder 3 has a surface 4.1 on which a pressure plate rests. The water tank 2 is arranged in the central axis position of the plate cylinder 3. From the water tank 2 lead 8 and return lines 9 to a dosing and tempering 6, which is filled via an inlet valve 13. A pump 10 doses the liquid from the reservoir 6 into the water tank 2. The liquid is supplied via the inlet valve 13 from a water reservoir 5. A water pipe 14 fills the water reservoir 5 as required.

In Fig. 2 ist die Anordnung der Feuchtwerke 1 und 1.1 innerhalb einer Druckmaschine 18 dargestellt. Die Flüssigkeit gelangt z. B. vom Feuchtwerk 1 über den Plattenzylinder 3 auf einen Gummizylinder 16 und weiter von diesem auf den Druckzylinder 17.2 shows the arrangement of the dampening units 1 and 1.1 within a printing press 18. The liquid reaches z. B. from the dampening unit 1 via the plate cylinder 3 to a blanket cylinder 16 and further from this to the impression cylinder 17th

Eine Oberfläche 4 des Druckzylinders 17 kann je nach Oberflächenveredelung z. B. vernickelt sein. Die Flüssigkeitsübertragung auf den Druckzylinder 17 erfolgt aus dem Feuchtwerk 1.1. Hier gelangt die Flüssigkeit über einen Plattenzylinder 3.1. Von diesem gelangt die Flüssigkeit von unten her über einen Gummizylinder 16.1 zu dem Druckzylinder 17 und ermöglicht damit die oben genannte Korrosionsbildung.A surface 4 of the printing cylinder 17 can depending on the surface finish z. B. be nickel-plated. The liquid transfer to the pressure cylinder 17 takes place from the dampening unit 1.1. Here the liquid passes through a plate cylinder 3.1. From there, the liquid passes from below via a rubber cylinder 16.1 to the pressure cylinder 17 and thus enables the above-mentioned formation of corrosion.

BezugszeichenlisteReference symbol list

  • 1 Feuchtwerk1 dampening system
  • 1.1 Feuchtwerk1.1 dampening system
  • 2 Wasserkasten2 water boxes
  • 3 Plattenzylinder3 plate cylinders
  • 3.1 Plattenzylinder3.1 plate cylinder
  • 4 Oberfläche4 surface
  • 4.1 oberer Plattenzylinder4.1 upper plate cylinder
  • 5 Wasservorlagebehälter5 water storage tanks
  • 6 Dosier- und Temperierbehälter6 dosing and tempering tanks
  • 8 Vorlagebehälter8 storage containers
  • 9 Rücklaufleitung9 return line
  • 10 Pumpe10 pump
  • 12 Kühlschlange12 cooling coil
  • 13 Einlaßventil13 inlet valve
  • 14 Wasserleitung14 water pipe
  • 15 Schwimmer15 swimmers
  • 16 Gummizylinder16 rubber cylinders
  • 16.1 Gummizylinder16.1 rubber cylinder
  • 17 Druckzylinder17 printing cylinders
  • 18 Druckmaschine18 printing press

Claims (3)

1. Use of 1H-benzotriazole as an additive for the damping agent isued in planographic printing processes with the object of protecting cylinder surfaces of nickel from corrosion.
2. Use according to Claim 1, characterised in that mixed into the damping agent is between 0.5 to 5 g 1 H-benzotriazole to ca. 10 litres damping agent.
3. Use according to Claim 2, characterised in that the damping agent has during printing a pH value greater than 5.0.
EP83108957A 1982-11-13 1983-09-10 Process for corrosion inhibition of printing machine cylinders Expired EP0108883B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83108957T ATE39336T1 (en) 1982-11-13 1983-09-10 PROCEDURE TO PREVENT CORROSION ON PRESS CYLINDERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3242104 1982-11-13
DE3242104A DE3242104C1 (en) 1982-11-13 1982-11-13 Use of an additive for corrosion protection of printing cylinder surfaces

Publications (3)

Publication Number Publication Date
EP0108883A2 EP0108883A2 (en) 1984-05-23
EP0108883A3 EP0108883A3 (en) 1986-08-20
EP0108883B1 true EP0108883B1 (en) 1988-12-21

Family

ID=6178109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108957A Expired EP0108883B1 (en) 1982-11-13 1983-09-10 Process for corrosion inhibition of printing machine cylinders

Country Status (3)

Country Link
EP (1) EP0108883B1 (en)
AT (1) ATE39336T1 (en)
DE (2) DE3242104C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3830467A1 (en) * 1988-09-08 1990-03-15 Hoechst Ag DAMPENER FOR OFFSET PRINTING
GB9418743D0 (en) * 1994-09-16 1994-11-02 Dupont Uk Limited Fount solutions for printing processes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE366560A (en) * 1929-12-09
US3764323A (en) * 1971-04-15 1973-10-09 Apeco Corp Method of forming lithographic printing plate
US3969237A (en) * 1973-03-22 1976-07-13 Mobil Oil Corporation Lubricant compositions containing benzotriazole derivatives as copper passivators

Also Published As

Publication number Publication date
DE3378725D1 (en) 1989-01-26
ATE39336T1 (en) 1989-01-15
EP0108883A3 (en) 1986-08-20
EP0108883A2 (en) 1984-05-23
DE3242104C1 (en) 1985-08-14

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