|Publication number||US3877372 A|
|Publication date||Apr 15, 1975|
|Filing date||Dec 3, 1973|
|Priority date||Dec 3, 1973|
|Publication number||US 3877372 A, US 3877372A, US-A-3877372, US3877372 A, US3877372A|
|Inventors||Leeds Kenneth W|
|Original Assignee||Leeds Kenneth W|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (78), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 11 1 [111 3,877,372
Leeds 1 1 Apr. 15, 1975  TREATMENT OF A PRINTING PLATE 3,398,002 8/ 1968 Bondurant et al. 106/2 WITH A DAMPENING LIQUID 3,625,715 12/1971 Nasca l06/2  Inventor: Kenneth W. Leeds, 2719 Elm Dr.,
N rth Bell r NY, 11710 Primary Examiner-Theodore Morris  Filed: Dec. 3, 1973  Appl. No.: 421,442  ABSTRACT A printing plate in lithographic offset or planographic  101/ sgg f 9 0 printing is treated by application thereto of an aque- 511 Int. Cl. C09k 3/18; c091 3/00; B4lm 3/08 gf t'r g 'gf 3 3 33333113,1 1 5113131 58 Field of Search 106/2 205 208- 101/451 y y e g y 101 ethylene glycol, 21 silicone-glycol copolymer and a defoamer. lsopropyl alcohol, which is contained in con- References Cited K212251181 dampening llqUldS, may be completely elimi- UNITED STATES PATENTS 3,354,824 1 l/l967 Griffith et al. 106/2 X 4 Claims, N0 Drawings TREATMENT OF A PRINTING PLATE WITH A DAMPENTNG LIQUID This invention relates to the application of dampening liquid to a printing plate in lithographic offset or planographic printing. More particularly, in the present invention a unique, advantageous dampening liquid is applied.
ln lithographic offset or planographic printing, the printing plate is chemically treated to provide a printing area and a nonprinting area, with the printing area, of course, being ink receptive and the nonprinting area being hydrophilic or water receptive. Pursuant to such treatment, a film of aqueous moistening or dampening liquid is applied to the surface of the plate, the liquid being retained by the hydrophilic area but repelled by the ink-receptive printing area, thus separating and isolating the nonprinting area from the ink which is applied to the printing area. As a result, only the image of the printing area is transferred to the blanket cylinder and onto the paper on which the image is printed.
To achieve successful printing by this method, it is necessary that the dampening liquid be applied to the surface of the printing plate in uniform and evenly distributed quantities and in regulated amounts to assure uniformly good quality reproduction of the printed image. To achieve such application of liquid, an arrangement of rollers is employed which transfers the dampening liquid onto the nonprinting areas of the cylinder.
For reasons which are well known in the lithographic art, the quantity of water which is applied is desirably kept at a minimum and only a sufficient amount is applied to form a minimum thickness of film on the nonprinting area to repel the ink and maintain that area ink free. Such regulation of the water or moistening liquid in correlation with the quantity of ink applied is commonly referred to as the ink-water balance, and proper control of this balance is essential to successful printing.
The reservoir of a dampening system, i.e., a mechanical system for the application of the dampening liquid or solution, is called a fountain. For that reason, the dampening solution is frequently called fountain solution". Fountain solutions usually contain in addition to water, a desensitizing gum such as gum arabic or Hydrogum (mesquite gum), an acid, usually phosphoric acid or an acid phosphate salt though sometimes gallic or tannic acid is used, ammonium bichromate and/or a nitrate salt such as ammonium nitrate, zinc nitrate or magnesium nitrate, and isopropyl alcohol. The constituents without the isopropyl alcohol may be referred to as fountain etch" or gum and etch."
lsopropyl alcohol vapors are hazardous. Moreover, in times of petrochemical shortages, isopropyl alcohol may be in very short supply. In the present invention, isopropyl alcohol is eliminated as a necessary constituent of fountain or dampening solutions. While one may maintain isopropyl alcohol in the dampening solutions of the invention, no advantage is to be gained from so doing.
In the present invention, the isopropyl alcohol is replaced with a chemical system constituted of ethylene glycol monobutyl ether, at least one of hexylene glycol and ethylene glycol, a silicone-glycol copolymer and a defoamer. The silicone-glycol copolymer is preferably a polyglycolpolydimethylsiloxane copolymer, particularly 473 Fluid" of the Chemical Products Division of Dow Corning Corporation, Midland, Mich., as described in its Bulletin 05-1853 of October, l967. The defoamer is preferably a silicone, particularly Antifoam l-l-lO Emulsion" silicone emulsion defoamer of the Chemical Products Division of Dow Corning Corporation, as described in its Bulletin 04-071 of August, 1965.
Ethylene glycol monobutyl ether was selected for use because of its miscibility with water and because it is an effective coupler. Hexylene glycol was selected because of its coupling properties and because it causes the mixture to level well, producing a thin film of the material on the printing plate. Ethylene glycol can be used instead of hexylene glycol, for its humectant prop erties, i.e., keeping the plate damp. Dow Corning 473 Fluid was selected because of its solubility in water. The defoamer is utilized to break the foam which results from the blending operation and to prevent the formation of foam in the reservoir and the recirculating system of the dampening system. In the absence of defoamer, a foaming problem is particularly noticed in Dahlgren and Dahlgrentype dampening systems.
It is convenient to constitute the dampening solution additives of the invention as a two part system, with all the active constituents but the defoamer being contained in one of the formulations. For ease of identification, a dye may be incorporated in one of the formulations. For example, the two part system may be constituted as follows:
An exemplary fountain solution containing the additives of the invention is constituted of percent water, 2.5 percent fountain etch, 1.5 percent of formula A and '1 percent of formula B, all by volume. A very typical conventional fountain etch contains 0.8 percent gum arabic, 0.1 percent phosphoric acid and 1.1 percent zinc nitrate. Two to four fluid ounces of formula A per gallon of fountain solution is typical.
While the defoamer prevents foam formation, the physicochemical action of the other active constituents of the fountain solution additive system of the invention, such as formula A, produce a thin, more uniform film of water across the dampening system and better wetting over the entire printing plate surface. Because of the thinner water film, pressmen can run with about 5 to 10 percent less water on the plate. By thus stabilizing ink-water balance, the additive system enables sharper printing, brighter colors and faster make-ready. The additive system also prevents stripping and the emulsification of ink. A few ounces of the additive system for each gallon of fountain'solution is all that is necessary for optimum results. The additive system eliminates the need for isopropyl alcohol.
Throughout the history of offset printing, the function of the dampening system, the distribution of water to the printing plate, has been a troublesome variable requiring frequent adjustment. The total additive system of the invention enables uniform, minimum water flow to the plate and its use costs less than the typical automated dampening system. In fact, the additive system of the invention makes any conventional dampening system perform like a sophisticated automated system.
Additive adjustments will depend on the water hardness, pH, temperature and other press variables and can be made on the basis of routine trial and error.
A typical successful run involving the fountain solution additives of the invention is as follows:
In an uninterrupted production run of 92,000 sheets in two colors, front and back, on a 38 X 48 inches Harris lithographic offset press equipped with a Harris Microflow dampening system, the customary fountain solution used was 5 fluid ounces of the aforementioned fountain etch, 1.5 gallons of isopropyl alcohol and 3.5 gallons of water. (Fountain solutions are customarily prepared in approximately 5 gallon batches.) For comparison an identical run was carried out using a fountain solution containing the additives according to the invention constituted of 16 fluid ounces of the fountain etch, 9.6 fluid ounces of formula A, 6.4 fluid ounces of formula B and sufficient water to make 5 gallons. The additive system of the invention resulted in excellent print quality without any foam or other production problems and the use of considerably less, up to onethird less, ink, with the elimination of isopropyl alcohol.
. While the invention has been described by reference to specific embodiments thereof, it is to be understood that such description is intended to illustrate rather than limit the invention, the scope of which is to be determined by reference to the appended claims.
What is claimed is:
1. In the treatment of a printing plate in lithographic offset or planographic printing to maintain an ink receptive printing area and a hydrophilic nonprinting area on the plate in which treatment a film of an aqueous dampening liquid is applied to the surface of the plate, the liquid comprising a desensitizing gum, water and at least one member of the group consisting of phosphoric acid, acid phosphate salts, gallic acid and tannic acid and being retained by the hydrophilic nonprinting area but repelled by the ink receptive printing area, thus separating and isolating the non-printing area from the ink which is applied to the printing area, the improvement in which the dampening liquid contains an additive system comprising ethylene glycol monobutyl ether, at least one of hexylene glycol and ethylene glycol, a silicone-glycol copolymer and a silicone emulsion defoamer, the proportion of the additive system in the dampening liquid being sufficient to produce a thin, more uniform film of water and better wetting over the entire plate surface thereby permifting printing with less water on the plate and to prevent stripping and emulsification of ink and to effect sharper printing with brighter colors.
2. In the treatment of claim 1, in the improvement in which the silicone-glycol copolymer comprises a polyglycol-polydimethylsiloxane copolymer.
3. In the treatment of claim 1, in the improvement in which the dampening liquid is isopropyl alcohol-free.
4. In the treatment of claim 2, in the improvement in which the dampening liquid is isopropyl alcohol-free.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3354824 *||May 4, 1964||Nov 28, 1967||Interchem Corp||Lithographic fountain solutions and method of use|
|US3398002 *||Jun 29, 1967||Aug 20, 1968||Bondurant||Universal fountain solution for planographic printing|
|US3625715 *||Jul 1, 1970||Dec 7, 1971||Salvatore Nasca||Polyethylene oxide dampening system for lithographic presses|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4247328 *||Jan 15, 1979||Jan 27, 1981||Vickers Limited||Lithographic fountain concentrates containing a desensitizing material in an organic solvent liquid|
|US4278467 *||Oct 22, 1979||Jul 14, 1981||Graphic Arts Technical Foundation||Substitutive additives for isopropyl alcohol in fountain solution for lithographic offset printing|
|US4560410 *||Jun 16, 1983||Dec 24, 1985||Union Carbide Corporation||Fountain solutions suitable for use in lithographic offset printing|
|US4589920 *||Oct 7, 1983||May 20, 1986||Mitsubishi Paper Mills, Ltd.||Ink composition utilized in lithographic printing and a lithographic printing process|
|US4854969 *||Feb 26, 1988||Aug 8, 1989||Sun Chemical Corporation||Lithographic fountain solutions|
|US4886553 *||Feb 14, 1989||Dec 12, 1989||Hoechst Celanese Corporation||Cleaner for lithographic printing plates|
|US4903599 *||Aug 17, 1988||Feb 27, 1990||Basf Farben & Fasern Akg.||Printed products and a process for their manufacture|
|US4997588 *||Oct 6, 1989||Mar 5, 1991||Hoechst Celanese Corporation||Cleaner for lithographic printing plates free of aromatic hydrocarbons|
|US5006168 *||Apr 3, 1989||Apr 9, 1991||Aqualon Company||Water soluble polymers as alcohol replacement in lithographic fountain solutions|
|US5106414 *||Apr 4, 1989||Apr 21, 1992||Fuji Photo Film Co., Ltd.||Dampening water composition for lithographic printing and additive for dampening water|
|US5163999 *||Sep 4, 1990||Nov 17, 1992||Fuji Photo Film Co., Ltd.||Dampening solution composition for lithographic printing|
|US5164000 *||Jun 27, 1991||Nov 17, 1992||Gamblin Rodger L||Lithographic printing fountain solution|
|US5228906 *||May 1, 1992||Jul 20, 1993||Fidler Kenneth L||Moistening agent for offset printing plates|
|US5338344 *||Mar 9, 1993||Aug 16, 1994||Bondurant Louis E||Decreasing alcohol content of fountain solutions for planographic printing|
|US5387279 *||Apr 12, 1993||Feb 7, 1995||Varn Products Company, Inc.||Lithographic dampening solution|
|US5443629 *||Nov 26, 1992||Aug 22, 1995||Alex Wilson Coldstream, Ltd.||Latent image ink|
|US5694848 *||Mar 13, 1996||Dec 9, 1997||Heidelberger Druckmaschinen Ag||Printing unit for water based inks|
|US5714302 *||Feb 23, 1996||Feb 3, 1998||Mitsubishi Paper Mills Limited||Method of printing with using lithographic printing plate made by silver complex diffusion transfer process and using dampening composition containing nonionic surface active agent|
|US5725646 *||Mar 13, 1996||Mar 10, 1998||Sun Chemical Corporation||Water-based offset lithographic printing ink|
|US5758580 *||Mar 13, 1996||Jun 2, 1998||Heidelberger Druckmaschinen Ag||Printing unit using various ink types|
|US5778789 *||Mar 13, 1996||Jul 14, 1998||Sun Chemical||Offset lithographic printing process with a water based ink|
|US5972088 *||Oct 26, 1998||Oct 26, 1999||Sun Chemical Corporation||Water-based gravure printing ink|
|US6209456||Jan 9, 1998||Apr 3, 2001||Heidelberger Druckmaschinen Ag||Web- and sheet-fed printing unit using various ink types, particularly water-based inks|
|US6245421||Feb 4, 1999||Jun 12, 2001||Kodak Polychrome Graphics Llc||Printable media for lithographic printing having a porous, hydrophilic layer and a method for the production thereof|
|US6276273||Jun 11, 1999||Aug 21, 2001||Kodak Polychrome Graphics Llc||Surfactant-pretreated printing plate substrate, lithographic printing plate and method for production thereof|
|US6427597||Jan 27, 2000||Aug 6, 2002||Patrice M. Aurenty||Method of controlling image resolution on a substrate|
|US6444022||May 20, 2000||Sep 3, 2002||Sun Chemical Corporation||Water based offset lithographic printing ink|
|US6451413||Jan 27, 2000||Sep 17, 2002||Kodak Polychrome Graphics Llc||Method of preparing a printing plate and printing plate|
|US6455132||Feb 4, 1999||Sep 24, 2002||Kodak Polychrome Graphics Llc||Lithographic printing printable media and process for the production thereof|
|US6471349||Jan 27, 2000||Oct 29, 2002||Kodak Polychrome Graphics Llc||Method to prepare a printing plate and printing plate|
|US6472054||Jan 27, 2000||Oct 29, 2002||Kodak Polychrome Graphics Llc||Method of preparing a printing plate and printing plate|
|US6532871||Jan 27, 2000||Mar 18, 2003||Kodak Polychrome Graphics Llc||Method of controlling image resolution on a substrate using an autophobic fluid|
|US6555205||Jan 27, 2000||Apr 29, 2003||Kodak Polychrome Graphics Llc||Printing plate and method to prepare a printing plate|
|US6593068||Nov 13, 2000||Jul 15, 2003||Fuji Photo Film Co., Ltd.||Concentrated dampening water composition for lithographic printing|
|US6709503||Dec 19, 2002||Mar 23, 2004||Sun Chemical Corporation||Waterbased heatset offset ink compositions|
|US6828013 *||Dec 11, 2000||Dec 7, 2004||Exxonmobil Oil Corporation||Porous biaxially oriented high density polyethylene film with hydrophilic properties|
|US7429292||Jun 15, 2006||Sep 30, 2008||Sun Chemical Corporation||Water washable lithographic printing ink|
|US8347787||Aug 5, 2011||Jan 8, 2013||Palo Alto Research Center Incorporated||Variable data lithography apparatus employing a thermal printhead subsystem|
|US8586277||Jul 12, 2012||Nov 19, 2013||Palo Alto Research Center Incorporated||Patterning of an image definition material by electro-wetting|
|US8833254||Jul 12, 2012||Sep 16, 2014||Xerox Corporation||Imaging system with electrophotographic patterning of an image definition material and methods therefor|
|US8919252||Aug 31, 2012||Dec 30, 2014||Xerox Corporation||Methods and systems for ink-based digital printing with multi-component, multi-functional fountain solution|
|US8950322||Mar 21, 2012||Feb 10, 2015||Xerox Corporation||Evaporative systems and methods for dampening fluid control in a digital lithographic system|
|US8958723 *||Sep 29, 2012||Feb 17, 2015||Xerox Corporation||Systems and methods for ink-based digital printing using liquid immersion development|
|US8991310||Aug 5, 2011||Mar 31, 2015||Palo Alto Research Center Incorporated||System for direct application of dampening fluid for a variable data lithographic apparatus|
|US9021948||Aug 5, 2011||May 5, 2015||Xerox Corporation||Environmental control subsystem for a variable data lithographic apparatus|
|US9021949||Feb 6, 2012||May 5, 2015||Palo Alto Research Center Incorporated||Dampening fluid recovery in a variable data lithography system|
|US9032874||Mar 21, 2012||May 19, 2015||Xerox Corporation||Dampening fluid deposition by condensation in a digital lithographic system|
|US9126452||Jul 29, 2013||Sep 8, 2015||Xerox Corporation||Ultra-fine textured digital lithographic imaging plate and method of manufacture|
|US9250516||Jul 29, 2013||Feb 2, 2016||Palo Alto Research Center Incorporated||Method of making a molded textured imaging blanket surface|
|US9272532||Jul 29, 2013||Mar 1, 2016||Palo Alto Research Center Incorporated||Molded textured imaging blanket surface|
|US9316993||Jul 12, 2012||Apr 19, 2016||Xerox Corporation||Electrophotographic patterning of an image definition material|
|US9316994||Jul 12, 2012||Apr 19, 2016||Xerox Corporation||Imaging system with electrophotographic patterning of an image definition material and methods therefor|
|US9327487||Aug 31, 2012||May 3, 2016||Xerox Corporation||Variable lithographic printing process|
|US9529307||Jul 12, 2012||Dec 27, 2016||Palo Alto Research Center Incorporated||Imaging system for patterning of an image definition material by electro-wetting and methods therefor|
|US9551934||Feb 19, 2016||Jan 24, 2017||Xerox Corporation||Imaging system with electrophotographic patterning of an image definition material and methods therefor|
|US9561677||Aug 31, 2012||Feb 7, 2017||Xerox Corporation||Imaging member for offset printing applications|
|US9567486||Aug 31, 2012||Feb 14, 2017||Xerox Corporation||Imaging member for offset printing applications|
|US9592698||Aug 31, 2012||Mar 14, 2017||Xerox Corporation||Imaging member for offset printing applications|
|US9616654||Aug 31, 2012||Apr 11, 2017||Xerox Corporation||Imaging member for offset printing applications|
|US9639050||Jul 12, 2012||May 2, 2017||Xerox Corporation||Electrophotographic patterning of an image definition material|
|US9643397||Dec 22, 2014||May 9, 2017||Palo Alto Research Center Incorporated||Variable data lithography system for applying multi-component images and systems therefor|
|US20060211790 *||Nov 8, 2002||Sep 21, 2006||Dimotakis Emmanuel D||Low tack water washable lithographic printing inks|
|US20070289488 *||Jun 15, 2006||Dec 20, 2007||Mcintosh Sidney||Water washable lithographic printing ink|
|US20140093284 *||Sep 29, 2012||Apr 3, 2014||Xerox Corporation||Systems and methods for ink-based digital printing using liquid immersion development|
|US20150040939 *||Oct 23, 2014||Feb 12, 2015||Xerox Corporation||Tunable surfactants in dampening fluids for digital offset ink printing applications|
|DE4113474A1 *||Apr 25, 1991||Oct 29, 1992||Heidelberger Druckmasch Ag||Feuchtmittel zur verwendung im offset-druckverfahren|
|DE4401619A1 *||Jan 20, 1994||Jul 28, 1994||Mitsubishi Paper Mills Ltd||Aq. damping soln. free from isopropanol and use in printing|
|EP0066176A1 *||May 17, 1982||Dec 8, 1982||Union Carbide Corporation||Fountain solutions suitable for use in lithographic offset printing|
|EP0249751A2 *||May 18, 1987||Dec 23, 1987||Hoechst Celanese Corporation||Feuchtmittel mit einem darin enthaltenen Polyolgemisch|
|EP0249751A3 *||May 18, 1987||Mar 23, 1988||Hoechst Celanese Corporation||Feuchtmittel mit einem darin enthaltenen polyolgemisch|
|EP0391159A2 *||Mar 22, 1990||Oct 10, 1990||Aqualon Company||Water soluble polymers as alcohol replacement in lithographic fountain solutions|
|EP0391159A3 *||Mar 22, 1990||Nov 13, 1991||Aqualon Company||Water soluble polymers as alcohol replacement in lithographic fountain solutions|
|EP1688266A1||Feb 3, 2005||Aug 9, 2006||Fuji Photo Film B.V.||Method and solvent mix to improve the dampening of lithographic printing plates|
|EP1990312A2||Oct 3, 2006||Nov 12, 2008||Sun Chemical Corporation||Security pigments and the process of making thereof|
|WO1992019455A1 *||Apr 22, 1992||Nov 12, 1992||Heidelberger Druckmaschinen Ag||Moistening agent for use in the offset printing process|
|WO1993000411A1 *||Jun 19, 1992||Jan 7, 1993||Gamblin Rodger L||Lithographic printing fountain solution|
|WO2010066886A1 *||Dec 11, 2009||Jun 17, 2010||Weros Technology Gmbh||Printing method, in particular offset-printing method, and separating means therefor|
|WO2012055870A1||Oct 25, 2011||May 3, 2012||Basf Se||Fountain solution and fountain solution concentrates|
|U.S. Classification||101/465, 106/2, 524/25, 101/451|
|International Classification||B41N3/08, B41N3/00|