EP0192813A1 - Fountain solution for offset printing plates - Google Patents
Fountain solution for offset printing plates Download PDFInfo
- Publication number
- EP0192813A1 EP0192813A1 EP85110346A EP85110346A EP0192813A1 EP 0192813 A1 EP0192813 A1 EP 0192813A1 EP 85110346 A EP85110346 A EP 85110346A EP 85110346 A EP85110346 A EP 85110346A EP 0192813 A1 EP0192813 A1 EP 0192813A1
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- EP
- European Patent Office
- Prior art keywords
- dampening solution
- collagen
- soluble
- solution according
- printing
- 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.)
- Granted
Links
- 238000007645 offset printing Methods 0.000 title claims abstract description 8
- 102000008186 Collagen Human genes 0.000 claims abstract description 17
- 108010035532 Collagen Proteins 0.000 claims abstract description 17
- 229920001436 collagen Polymers 0.000 claims abstract description 17
- 102000016942 Elastin Human genes 0.000 claims abstract description 8
- 108010014258 Elastin Proteins 0.000 claims abstract description 8
- 229920002549 elastin Polymers 0.000 claims abstract description 8
- 229920000620 organic polymer Polymers 0.000 claims abstract description 6
- 150000001298 alcohols Chemical class 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000012736 aqueous medium Substances 0.000 claims description 2
- 239000004480 active ingredient Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 239000000243 solution Substances 0.000 description 33
- 238000007639 printing Methods 0.000 description 26
- 230000000694 effects Effects 0.000 description 8
- 239000000976 ink Substances 0.000 description 7
- 150000005846 sugar alcohols Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000005660 hydrophilic surface Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- DCTMXCOHGKSXIZ-UHFFFAOYSA-N (R)-1,3-Octanediol Chemical compound CCCCCC(O)CCO DCTMXCOHGKSXIZ-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 description 2
- ANWMPOLHSRXCNH-UHFFFAOYSA-N decane-1,3-diol Chemical compound CCCCCCCC(O)CCO ANWMPOLHSRXCNH-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- -1 glycol ethers Chemical class 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 229960003330 pentetic acid Drugs 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 210000002435 tendon Anatomy 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- 229940031723 1,2-octanediol Drugs 0.000 description 1
- 239000005968 1-Decanol Substances 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 101710145505 Fiber protein Proteins 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 206010067482 No adverse event Diseases 0.000 description 1
- 241000978776 Senegalia senegal Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 125000003368 amide group Chemical class 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003429 antifungal agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 244000309466 calf Species 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 210000000845 cartilage Anatomy 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000007979 citrate buffer Substances 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 210000002808 connective tissue Anatomy 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- ZITKDVFRMRXIJQ-UHFFFAOYSA-N dodecane-1,2-diol Chemical compound CCCCCCCCCCC(O)CO ZITKDVFRMRXIJQ-UHFFFAOYSA-N 0.000 description 1
- GVEPAEOOBURRFW-UHFFFAOYSA-N dodecane-1,3-diol Chemical compound CCCCCCCCCC(O)CCO GVEPAEOOBURRFW-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 210000004177 elastic tissue Anatomy 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000000855 fungicidal effect Effects 0.000 description 1
- 239000000417 fungicide Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- AEIJTFQOBWATKX-UHFFFAOYSA-N octane-1,2-diol Chemical compound CCCCCCC(O)CO AEIJTFQOBWATKX-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 229920003170 water-soluble synthetic polymer Polymers 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 invention relates to a means for improving the dampening of offset printing forms.
- DE-OS 26 25 604 describes dampening solutions based on acidic alcohol / water solutions with mono- and polyvalent low-alkyl alcohols and glycol ethers with molecular weights of 170 or less, in which no more than four successive carbon atoms should be present.
- These fountain solutions contain polyacrylamides, acids and their salts, optionally together with hydroxymethyl cellulose, in an amount of 0.001 to 5% by weight.
- Metal nitrates and organic chelating agents are also added.
- the dampening solution additives consist of silicon dioxide or mixed oxides, with polyhydric alcohols and citrate buffers optionally being added. No further details are given on the type and mode of action of the polyhydric alcohols.
- the product should also be biodegradable.
- Elastin is a fiber protein closely related to collagen and the main component of the elastic fibers in the tendons. It differs from collagen in that it does not swell in water and its elastic properties. The production of these proteins is carried out according to the best known methods, particularly those introduced in cosmetics and medicine, and is not the subject of the present invention.
- a significant improvement in the adhesive property of the dampening solution on the non-printing surfaces occurs when collagen and / or elastin are present as hydrolyzates.
- the dampening solution according to the invention preferably contains a concentration of native collagen and / or elastin of 0.01 to 3% by weight, based on the total weight of the solution, of collagen and / or elastin which is soluble in weakly acidic aqueous medium. Higher concentrations can lead to undesirable gel formation on the printing surface, smaller amounts often no longer show a sufficient hydrophobing effect.
- the optimal pH of the dampening solution is between 4.5 and 5.5. If it is smaller, the printing plate will be perfectly clean; however, it can be chemically attacked and the paper and ink can be adversely affected. The drying of the ink is also delayed. When the pH is above 7, the binder in the printing ink is usually saponified.
- the setting and stabilization of the optimal surface energy of the dampening solution i.e. its ability to produce a thin, stable and uniform film on the hydrophilic surfaces of the printing form, is carried out according to the present invention by adding longer-chain (n ⁇ 6), non-polymeric alcohols and / or alkane diols with OH groups in the (1,2) or (1,3) position, concentrations of 0.05 to 1.0% by weight being the most advantageous. These substances also act as defoamers in the specified proportions. Polymers or short-chain alcohols, as described in EP-OS 24 289 this combination of effects is not shown, or, as in the case of isopropyl alcohol or ethanol, amounts of 8-15% are required to set the same surface energies as above. The values of the polar components of the specific free surface energy are not at all achieved with these latter alcohols.
- the alcohols according to the invention have no toxic effects in the amounts stated, especially since they become volatile even under the conditions of use of the printing process.
- the fountain solution according to the invention is used in small amounts of known organic complexing agents, e.g. B. ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or hydroxyethylenediaminetriacetic acid (HEDTA).
- organic complexing agents e.g. B. ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or hydroxyethylenediaminetriacetic acid (HEDTA).
- the pH values of the dampening solution according to the invention can therefore be individually adjusted without further ado. Nevertheless, any interruption in the printing process does not lead to a deterioration in the dampening film, which is usually the case when using conventional dampening solutions.
- the amount of waste when starting up the printing unit is therefore minimal; in the best case it can even be printed without rejects.
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Printing Methods (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Paper (AREA)
Abstract
Description
Die Erfindung betrifft ein Mittel zur Verbesserung der Feuchtung von Offsetdruckformen.The invention relates to a means for improving the dampening of offset printing forms.
Offsetdruck- oder Flachdruckformen haben die Eigenschaft, an den nichtdruckenden Flächen hydrophil, an den druckenden Flächen hydrophob (=oleophil) zu sein. Im Laufe des Druckvorganges werden sie über alle Flächen mit einem wäßrigen Feuchtmittel vollständig benetzt, anschließend erfolgt die Einfärbung mit der ölhaltigen Druckfarbe.Offset printing or planographic printing plates have the property of being hydrophilic on the non-printing surfaces and hydrophobic (= oleophilic) on the printing surfaces. In the course of the printing process, they are completely wetted over all surfaces with an aqueous dampening solution, followed by inking with the oil-based printing ink.
Die hydrophilen, vom Feuchtmittel benetzten Stellen können nicht von der hydrophoben, öligen Druckfarbe benetzt werden. Auf diese Weise entsteht auf der Druckform ein farbiges Druckbild, welches über einen Gummizylinder auf den Bedruckstoff, das ist der zu bedruckende Werkstoff, übertragen wird.The hydrophilic areas wetted by the dampening solution cannot be wetted by the hydrophobic, oily ink. In this way, a colored print image is created on the printing form, which is transferred via a rubber cylinder to the printing material, which is the material to be printed.
Die Stabilität dieses Feuchtmittelfilmes, d. h. eine bestimmte Differenz zwischen der spezifischen freien Oberflächenenergie des Druckformmaterials und der Flüssigkeit, ist entscheidend für eine saubere Druckfarbenverteilung. Ausführliche theoretische Beschreibungen des Oberflächenverhaltens, dessen Verbesserung die Grundlage der vorliegenden Erfindung bildet, finden sich beispielsweise in Advances in Printing Science and Technology (Proceedings of the 17th International Conference of Printing Research Institutes, Saltsjöbadan, Schweden, S. 229 - 246, Juni 1983).Es wurden bereits zahlreiche Versuche unternommen, Feuchtmittel mit Zusätzen zu versehen, welche die Benetzbarkeit und hydrophilierende Wirkung verbessern. Stand der Technik sind hierbei wasselösliche synthetische und natürliche Polymeren, wie z. B. kurzkettige, auch mehrwertige Alkohole, Gummiarabikum, Stärke, Alginate, Dextrin, Cellulosen sowie Gelatine. In Internat. Bull. (1956, Januar), S. 30-35, sind Verwendung und Wirkung dieser Zusätze beschrieben.The stability of this dampening solution film, i. H. a certain difference between the specific free surface energy of the printing plate material and the liquid is crucial for a clean ink distribution. Detailed theoretical descriptions of surface behavior, the improvement of which forms the basis of the present invention, can be found, for example, in Advances in Printing Science and Technology (Proceedings of the 17th International Conference of Printing Research Institutes, Saltsjöbadan, Sweden, pp. 229-246, June 1983). Numerous attempts have been made to add fountain solutions to the dampening solution, which improve the wettability and hydrophilizing effect. State of the art are water-soluble synthetic and natural polymers, such as. B. short-chain, also polyhydric alcohols, gum arabic, starch, alginates, dextrin, celluloses and gelatin. In boarding school. Bull. (1956, January), pp. 30-35, describes the use and effect of these additives.
Die DE-OS 26 25 604 beschreibt Feuchtmittel auf der Basis saurer Alkohol/Wasser-Lösungen mit ein- und mehrwertigen niedrig-Alkylalkoholen und Glykoläthern mit Molekulargewichten von 170 oder weniger, in denen nicht mehr als vier aufeinanderfolgende C-Atome vorhanden sein sollen. Diese Feuchtmittel enthalten Polyacrylamide, -säuren und deren Salze, gegebenenfalls gemeinsam mit Hydroxymethylcellulose, in einer Menge von 0,001 bis 5 Gew.-%. Ferner werden Metallnitrate und organische Chelatbildner zugegeben.DE-OS 26 25 604 describes dampening solutions based on acidic alcohol / water solutions with mono- and polyvalent low-alkyl alcohols and glycol ethers with molecular weights of 170 or less, in which no more than four successive carbon atoms should be present. These fountain solutions contain polyacrylamides, acids and their salts, optionally together with hydroxymethyl cellulose, in an amount of 0.001 to 5% by weight. Metal nitrates and organic chelating agents are also added.
Gemäß der DE-AS 1 105 439 bestehen die Feuchtmittelzusätze aus Siliciumdioxid oder Mischoxiden, wobei gegebenenfalls mehrwertige Alkohole und Citratpuffer zugesetzt sind. Nähere Angaben über Art und Wirkungsweise der mehrwertigen Alkohole werden nicht gemacht.According to DE-AS 1 105 439, the dampening solution additives consist of silicon dioxide or mixed oxides, with polyhydric alcohols and citrate buffers optionally being added. No further details are given on the type and mode of action of the polyhydric alcohols.
Polyalkohole und kurzkettige, mehrwertige Alkohole neigen bei Anwesenheit von organischen Polymeren zu mangelhafter Filmbildung, was die Adsorption des wäßrigen Feuchtmittels auf der Metalloberfläche der Offsetdruckformen erheblich behindert. Ferner sind diese Alkohole wegen ihrer teilweise quellend wirkenden Einflüsse problematisch. Wasserlösliche polymere Feuchtmittelzusätze nach dem Stand der Technik üben bei nicht exakter Einhaltung bestimmter Konzentrationen sowie bei Temperatur- und Luftfeuchtigkeitsschwankungen oft einen negativen Einfluß auf die Druckqualität sowie die Trockenzeiten der Farben aus. Ferner setzt ihre Wirkung nach Unterbrechung des Druckvorganges meist nur zögernd wieder ein, so daß beim Anfahren der Maschinen lange Andruckzeiten mit viel Makulatur oft in Kauf genommen werden müssen.In the presence of organic polymers, polyalcohols and short-chain, polyhydric alcohols tend to form insufficient films, which considerably hinders the adsorption of the aqueous dampening solution on the metal surface of the offset printing plates. Furthermore, these alcohols are problematic because of their swelling effects. Water-soluble polymeric fountain solution additives according to the prior art often have a negative influence on the print quality and the drying times of the inks if certain concentrations are not exactly adhered to and if the temperature and humidity fluctuate. Furthermore, their effect usually only starts again slowly after an interruption of the printing process, so that long press times with a lot of waste often have to be accepted when starting up the machines.
Aufgabe der vorliegenden Erfindung ist es daher, ein Feuchtmittel für Offsetdruckformen zu schaffen, dessen wasserlösliche polymere Bestandteile die obigen Nachteile nicht zeigen und welches bei bester hydrophilierender und filmbildender Wirkung hohe Standzeiten aufweist. Ferner soll das Produkt biologisch abbaubar sein.It is therefore an object of the present invention to provide a dampening solution for offset printing forms, the water-soluble polymer components of which do not show the above disadvantages and which has a long service life with the best hydrophilizing and film-forming action. The product should also be biodegradable.
Die Aufgabe wird entsprechend den vorliegenden Patentansprüchen gelöst.The object is achieved in accordance with the present patent claims.
Natives, lösliches Kollagen ist bekannt und weist die folgenden Eigenschaften auf:
- Es umfaßt eine Dreifacfrhelix aus drei Spiralketten α, ß und δ, deren Molekulargewichte etwa 100000, 200000 bzw. 300000 betragen. Die α-Kette besteht aus zwei Untereinheiten α1 und α2, welche jeweils ein Molekulargewicht von ca. 100000 aufweisen und sich geringfügig in der Art der sie bildenden Aminosäuren voneinander unterscheiden. Die β -Kette besteht aus zwei Untereinheiten, β11, welche aus zwei Untereinheiten α1 aufgebaut ist, und β12 ,welche aus einer Untereinheit α1 und einer Untereinheit α2 besteht. Die beiden Untereinheiten β11 und β12 besitzen ein Molekulargewicht von ca. 200000. Andererseits findet sich in Abhängigkeit von der Extraktionsweise des Kollagens am Ende einer jeden Helix eine geradkettige Polypeptidkette, welche als Telopeptid bezeichnet wird, mit einer Länge von etwa 5 nm. Ein solches Kollagen kann beispielsweise aus Stütz- und Bindegeweben der Sehnen, Bänder, Knorpel und eiweißhaltigen Knochensubstanz sowie der Haut von insbesondere jungen Tieren, z. B. Kälbern, durch Extraktion mit schwach saurer wässriger Lösung gewonnen werden.
- It comprises a three-fold helix consisting of three spiral chains α, β and δ, the molecular weights of which are approximately 100,000, 200,000 and 300,000, respectively. The α chain consists of two subunits α 1 and α 2 , each of which has a molecular weight of approximately 100,000 and differ slightly from one another in the type of the amino acids forming them. The β chain consists of two subunits, β 11 , which is composed of two subunits α 1 , and β 12 , which consists of a subunit α 1 and a subunit α 2 . The two subunits β 11 and β 12 have a molecular weight of approximately 200,000. On the other hand, depending on the manner in which the collagen is extracted, at the end of each helix there is a straight-chain polypeptide chain, which is referred to as a telopeptide, with a length of approximately 5 nm Such collagen can, for example, from supporting and connective tissues of the tendons, ligaments, cartilage and protein-containing bone substance as well as the skin of especially young animals, e.g. B. calves, can be obtained by extraction with weakly acidic aqueous solution.
Elastin ist ein stofflich mit Kollagen nahe verwandtes Faserprotein und der Hauptbestandteil der elastischen Fasern in den Sehnen. Es unterscheidet sich von Kollagen durch das Fehlen der Quellbarkeit in Wasser und durch seine elastischen Eigenschaften. Die Gewinnung dieser Proteine verläuft nach insbesondere in der Kosmetik und Medizin eingeführten, bestens bekannten Verfahren und ist nicht Gegenstand der vorliegenden Erfindung.Elastin is a fiber protein closely related to collagen and the main component of the elastic fibers in the tendons. It differs from collagen in that it does not swell in water and its elastic properties. The production of these proteins is carried out according to the best known methods, particularly those introduced in cosmetics and medicine, and is not the subject of the present invention.
Die Verwendung von nativem löslichem, d. h. nicht durch Alterung oder sonstige Behandlung vernetztem Kollagen und/oder Elastin erwies sich überraschenderweise als Lösung aller oben genannter Schwierigkeiten, welche mit den bisher bekannten wasserlöslichen Polymeren auftraten. Umfangreiche Druckversuche und Messungen von Oberflächenspannungen ergaben, daß dieses Kollagen bzw. Elastin an die Offsetdruckform und das Drucktuch gleichermaßen adsorptiv gebunden werden und eine hervorragende, bleibende hydrophilierende Wirkung des Feuchtmittels sicherstellen. Zudem sind diese Polymeren absolut ungiftig.The use of native soluble, ie not through Aging or other treatment of cross-linked collagen and / or elastin surprisingly proved to be a solution to all of the above-mentioned difficulties which occurred with the previously known water-soluble polymers. Extensive printing tests and measurements of surface tensions have shown that this collagen or elastin are bound to the offset printing form and the printing blanket in the same way by adsorption and ensure an excellent, permanent hydrophilizing effect of the dampening solution. In addition, these polymers are absolutely non-toxic.
Eine wesentliche Verbesserung der Adhäsionseigenschaft des Feuchtmittels an den nichtdruckenden Flächen tritt ein, wenn Kollagen und/oder Elastin als Hydrolysate vorliegen.A significant improvement in the adhesive property of the dampening solution on the non-printing surfaces occurs when collagen and / or elastin are present as hydrolyzates.
Desweiteren wurde ein überraschender "Gedächtniseffekt" des erfindungsgemäßen Feuchtmittels für hydrophile Flächenbereiche festgestellt, wenn es ein lösliches, zumindest teilweise desamidiertes (Substitution von Amidgruppen durch Hydroxylgruppen) Kollagen enthält. In vielen Fällen ist ein derartiges Kollagen gemäß DE-OS 25 14 844 besonders zweckmäßig. Der Effekt stellt sich folgendermaßen dar:
- Die Adsorption des Feuchtmittels erfolgt bevorzugt auf den Oberflächenpartien, auf denen bereits wässrige Kollagenlösungen vorhanden waren. Dieses Verhalten ist von Vorteil, wenn während des Druckvorganges die Zugabemenge an Feuchtmittel gewissen Schwankungen unterworfen ist (Unterbrechung des Druckvorganges), so daß diesbezüglich eine temporäre Unterversorgunq der hydrophilen Flächen eintreten kann.
- The dampening solution is preferably adsorbed on the surface areas on which aqueous collagen solutions were already present. This behavior is advantageous if the amount of dampening solution added is subject to certain fluctuations during the printing process (interruption of the printing process), so that in this regard a temporary undersupply of the hydrophilic surfaces can occur.
Vorzugsweise enthält das erfindungsgemäße Feuchtmittel unter Einsatzbedingungen eine Konzentration an nativem, in schwach saurem wäßrigem Medium löslichem Kollagen und/oder Elastin von 0,01 bis 3 Gew.-%, bezogen auf das Gesamtgewicht der Lösung. Höhere Konzentrationen können zu einer unerwünschten Gelbildung auf der Druckfläche führen, geringere Mengen zeigen oft keinen ausreichenden Hydrophobierungseffekt mehr.The dampening solution according to the invention preferably contains a concentration of native collagen and / or elastin of 0.01 to 3% by weight, based on the total weight of the solution, of collagen and / or elastin which is soluble in weakly acidic aqueous medium. Higher concentrations can lead to undesirable gel formation on the printing surface, smaller amounts often no longer show a sufficient hydrophobing effect.
Der optimale pH-Wert des Feuchtmittels liegt zwischen 4,5 und 5,5. Ist er kleiner, wird zwar die Druckplatte einwandfrei sauber; sie kann jedoch chemisch angegriffen werden, und es können sich negative Auswirkungen auf das Papier und die Druckfarbe zeigen. Außerdem wird die Trocknung der Druckfarbe verzögert. Bei einem pH-Wert über 7 tritt meistens eine Verseifung des Bindemittels in der Druckfarbe ein.The optimal pH of the dampening solution is between 4.5 and 5.5. If it is smaller, the printing plate will be perfectly clean; however, it can be chemically attacked and the paper and ink can be adversely affected. The drying of the ink is also delayed. When the pH is above 7, the binder in the printing ink is usually saponified.
Zur Stabilisierung des pH-Wertes haben sich für das erfindungsgemäße Feuchtmittel an sich bekannte Puffer wie z. B. Natriumcitrat/Citronensäure oder Stärkecitrate als geeignet erwiesen.To stabilize the pH have known per se for the dampening solution according to the invention such as. B. sodium citrate / citric acid or starch citrates have been found to be suitable.
Die Einstellung und Stabilisierung der optimalen Oberflächenenergie des Feuchtmittels, also dessen Fähigkeit, einen dünnen, stabilen und gleichmäßigen Film auf den hydrophilen Flächen der Druckform zu erzeugen, erfolgt nach der vorliegenden Erfindung durch Zusätze längerkettiger (n ≥ 6), nichtpolymerer Alkohole und/oder Alkandiole mit OH-Gruppen in (1,2)- oder (1,3)-Stellung, wobei Konzentrationen von 0,05 bis 1,0 Gew.-% am vorteilhaftesten sind. Diese Substanzen wirken im angegebenen Mengenverhältnis zudem als Entschäumer. Polymere oder kurzkettige Alkohole, wie sie in der EP-OS 24 289 aufgeführt sind, zeigen diese Wirkunqskombination nicht, oder man benötigt, wie im Falle von Isopropylalkohol oder Ethanol, Mengen von 8 - 15 ö, um gleiche Oberflächenenergien wie oben einzustellen. Die Werte der polaren Anteile der spezifischen freien Oberflächenenergie werden mit diesen letzteren Alkoholen überhaupt nicht erreicht. Zudem zeigen die erfindungsgemäßen Alkohole in den angegebenen Mengen keinerlei toxische Wirkungen, zumal sie bereits unter den Einsatzbedinungen des Druckvorganges flüchtig werden.The setting and stabilization of the optimal surface energy of the dampening solution, i.e. its ability to produce a thin, stable and uniform film on the hydrophilic surfaces of the printing form, is carried out according to the present invention by adding longer-chain (n ≥ 6), non-polymeric alcohols and / or alkane diols with OH groups in the (1,2) or (1,3) position, concentrations of 0.05 to 1.0% by weight being the most advantageous. These substances also act as defoamers in the specified proportions. Polymers or short-chain alcohols, as described in EP-OS 24 289 this combination of effects is not shown, or, as in the case of isopropyl alcohol or ethanol, amounts of 8-15% are required to set the same surface energies as above. The values of the polar components of the specific free surface energy are not at all achieved with these latter alcohols. In addition, the alcohols according to the invention have no toxic effects in the amounts stated, especially since they become volatile even under the conditions of use of the printing process.
Als Alkohole eignen sich beispielsweise die aufsteigende Reihe 1-Hexanol bis 1-Dekanol. Unter den 1,2- und 1,3-Alkandiolen haben sich als besonders vorteilhaft erwiesen:
- 1,2- Oktandiol; 1,3- Dekandiol; 1,2- Dodekandiol;
- 1,3- Oktandiol; 1,3- Dekandiol; 1,3- Dodekandiol.
- 1,2-octanediol; 1,3-decanediol; 1,2-dodecanediol;
- 1,3-octanediol; 1,3-decanediol; 1,3-dodecanediol.
Bei der Verwendung natürlicher organischer Substanzen besteht die Gefahr ihrer Zersetzung durch Bakterien und Pilze. Es ist daher ratsam und Stand der Technik, einem solchen Feuchtmittel handelsübliche antibakterielle oder bakteriostatische bzw. fungizide oder fungistatische Mittel in ausreichender Menge zur Konservierung zuzugeben. Es sind bereits natürliche, biologisch abbaubare Substanzen bekannt, welche nicht nur das Feuchtmittel selbst stabilisieren, sondern auch die Behälter, den Feuchte-Duktor und das Leitungssystem in der Druckmaschine schützen.When using natural organic substances there is a risk of their decomposition by bacteria and fungi. It is therefore advisable and state of the art to add commercially available antibacterial or bacteriostatic or fungicidal or fungistatic agents in sufficient quantity for preservation to such a dampening solution. Natural, biodegradable substances are already known which not only stabilize the dampening solution itself, but also protect the containers, the moisture ductor and the line system in the printing press.
Die Verwendung von Leitungs- oder standardhartem Wasser nach DIN 53 910 ( 1 mmol Ca2+/1) zur Abmischung des Feuchtmittels kann durch die darin enthaltenen mehrwertigen Metallkationen zu unerwünschten Belagbildungen auf der Druckform führen. Den gleichen Effekt bewirken bei zu hohen pH-Werten diejenigen Metallkationen, welche sich in der Befeuchtungslösung als Abrieb von der Druckform und der Befeuchtungswalze ansammeln. Aus diesem Grunde werden dem erfindungsgemäßen Feuchtmittel geringe Mengen an sich bekannter organischer Komplexbildner, z. B. Ethylendiamintetraessigsäure (EDTA), Diethylentriaminpentaessigsäure (DTPA) oder Hydroxyethylendiamintriessigsäure (HEDTA), zugesetzt.The use of tap or standard hard water according to DIN 53 910 (1 mmol Ca 2+ / 1) to mix the dampening solution can lead to undesirable deposits on the printing form due to the multivalent metal cations contained therein. If the pH values are too high, those metal cations which accumulate in the dampening solution as abrasion from the printing form and the dampening roller have the same effect. For this Basically, the fountain solution according to the invention is used in small amounts of known organic complexing agents, e.g. B. ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or hydroxyethylenediaminetriacetic acid (HEDTA).
Im folgenden werden beispielhafte Zusammensetzungen des Feuchtmittels gemäß der Erfindung a-ngegeben.
Je nach Wahl der Art des zu bedruckenden Papieres sind also die pH-Werte des erfindungsgemäßen Feuchtmittels ohne weiteres individuell einstellbar. Dennoch führt eine etwaige Unterbrechung des Druckvorganges zu keiner Verschlecheterung des Feuchtfilmes, was bei Verwendung herkömmlicher Feuchtmittel meistens der Fall ist. Der Anfall an Makulatur beim Anfahren des Druckwerkes ist daher minimal; günstigenfalls kann sogar ohne Ausschuß angedruckt werden.Depending on the choice of the type of paper to be printed, the pH values of the dampening solution according to the invention can therefore be individually adjusted without further ado. Nevertheless, any interruption in the printing process does not lead to a deterioration in the dampening film, which is usually the case when using conventional dampening solutions. The amount of waste when starting up the printing unit is therefore minimal; in the best case it can even be printed without rejects.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85110346T ATE39232T1 (en) | 1985-02-16 | 1985-08-19 | DAMPING SOLUTION FOR OFFSET PRINTING FORMS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3505452A DE3505452C2 (en) | 1985-02-16 | 1985-02-16 | Fountain solution for offset printing forms |
| DE3505452 | 1985-02-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0192813A1 true EP0192813A1 (en) | 1986-09-03 |
| EP0192813B1 EP0192813B1 (en) | 1988-12-14 |
Family
ID=6262761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85110346A Expired EP0192813B1 (en) | 1985-02-16 | 1985-08-19 | Fountain solution for offset printing plates |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4711670A (en) |
| EP (1) | EP0192813B1 (en) |
| JP (1) | JPS61189997A (en) |
| AT (1) | ATE39232T1 (en) |
| BR (1) | BR8505455A (en) |
| DE (2) | DE3505452C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0517959A1 (en) * | 1991-06-10 | 1992-12-16 | Agfa-Gevaert N.V. | Fountain solution for a diazobased lithographic printing plate |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5228906A (en) * | 1992-05-01 | 1993-07-20 | Fidler Kenneth L | Moistening agent for offset printing plates |
| EP1529172A1 (en) * | 2002-08-15 | 2005-05-11 | DOW CORNING GmbH | Composition and device for dampening mechanical motion |
| DE102007042107B4 (en) * | 2007-09-05 | 2010-07-15 | Siemens Ag | Pharmaceutical composition with iron-binding agent |
| JP2009096178A (en) * | 2007-09-26 | 2009-05-07 | Fujifilm Corp | Dampening solution composition for lithographic printing and heat set-off ring printing method |
| US20090081592A1 (en) * | 2007-09-26 | 2009-03-26 | Fujifilm Corporation | Fountain solution composition for lithographic printing and heat-set offset rotary printing process |
| US20090078140A1 (en) * | 2007-09-26 | 2009-03-26 | Fujifilm Corporation | Fountain solution composition for lithographic printing and heat-set offset rotary printing process |
| JP5311193B2 (en) * | 2007-09-26 | 2013-10-09 | 富士フイルム株式会社 | Dampening solution composition for lithographic printing and heat set-off ring printing method |
| JP2009234247A (en) | 2008-03-07 | 2009-10-15 | Fujifilm Corp | Dampening water composition for lithographic printing and heat-set rotary offset printing process |
| JP5288268B2 (en) | 2009-03-25 | 2013-09-11 | 富士フイルム株式会社 | Dampening solution composition for lithographic printing and heat set-off ring printing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2305971A1 (en) * | 1975-04-04 | 1976-10-29 | Freudenberg Carl | COSMETIC ACTIVE SUBSTANCE BASED ON COLLAGEN |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3042524A (en) * | 1958-02-12 | 1962-07-03 | Gen Aniline & Film Corp | Plasticized gelatin and related proteinaceous colloids |
| US3738913A (en) * | 1970-09-11 | 1973-06-12 | Wilson Pharm & Chem Corp | Method of preparing polypeptides |
| NL7603530A (en) * | 1975-04-07 | 1976-10-11 | Dow Chemical Co | METHOD, COMPOSITION AND EMULSION FOR TREATING IMAGE-BEARING LITHOGRAPHIC PRINTING PLATES AS WELL AS COATED PLATES OBTAINED. |
-
1985
- 1985-02-16 DE DE3505452A patent/DE3505452C2/en not_active Expired
- 1985-08-19 DE DE8585110346T patent/DE3566786D1/en not_active Expired
- 1985-08-19 EP EP85110346A patent/EP0192813B1/en not_active Expired
- 1985-08-19 AT AT85110346T patent/ATE39232T1/en not_active IP Right Cessation
- 1985-11-01 BR BR8505455A patent/BR8505455A/en unknown
- 1985-11-19 US US06/799,400 patent/US4711670A/en not_active Expired - Fee Related
-
1986
- 1986-02-10 JP JP61027746A patent/JPS61189997A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2305971A1 (en) * | 1975-04-04 | 1976-10-29 | Freudenberg Carl | COSMETIC ACTIVE SUBSTANCE BASED ON COLLAGEN |
Non-Patent Citations (2)
| Title |
|---|
| INTERNATIONAL BULLETIN, Januar 1956, Seiten 30-36; R.C. ADAMS: "A method for comparing the relative lithographic desensitising strengths of some water-soluble materials" * |
| P. GLAFKIDES: "Chimie et physique photographiques", 3. Ausgabe, Seiten 300-302, Publications Photo-Cinéma Paul Montel, Paris, FR * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0517959A1 (en) * | 1991-06-10 | 1992-12-16 | Agfa-Gevaert N.V. | Fountain solution for a diazobased lithographic printing plate |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3566786D1 (en) | 1989-01-19 |
| BR8505455A (en) | 1986-12-16 |
| US4711670A (en) | 1987-12-08 |
| DE3505452C2 (en) | 1986-12-04 |
| DE3505452A1 (en) | 1986-08-21 |
| ATE39232T1 (en) | 1988-12-15 |
| EP0192813B1 (en) | 1988-12-14 |
| JPS61189997A (en) | 1986-08-23 |
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