Treating at room temperature the printing screen ink residue with a non-aqueous biodegradable liquid composition consisting essentially of about 30 to 85% N-methyl-2-pyrrolidone, about 10 to 35% oxygenated solvent and about 1-5% surfactant,Īllowing the composition to dwell on the ink surface for a sufficient period of time to degrade the ink residue, A method of cleaning and reclaiming a printing screen having a printed image of an emulsion and a residue of ink on the surface thereof which comprises the steps of The method of claim 15 wherein said water dispersible oil is selected from the group consisting of polyalkylene glycol, ethoxylated lanolin and ethoxylated castor oil.ġ7. The method of claim 8 wherein said liquid composition additionally includes a water dispersible oil in an amount which functions in said composition initially as a repellant to a light water spray but allows a stream of water to remove said inks from said screen.ġ6. The method of claim 13 wherein after several hours dwell time the degrded ink is treated with a liquid concentration of about 30 to 85% of N-methyl-2-pyrrolidone, about 10 to 35% oxygenated solvent, methylene chloride, and about 1-5% surfactant prior to rinsing.ġ5.
The method of claim 12 wherein the dwell time of said ink surface is from about several minutes up to several hours.ġ4. The method of claim 8 wherein the oxygenated solvent is selected from the group consisting of butyl cellosolve, cellosolve acetate and cyclohexanone, and mixtures thereof.ġ3. The method of claim 8 wherein water rinse is a pressurized low-volume water rinse.ġ2. The method of claim 8 wherein rinse water is applied as a fan spray.ġ1. The method of claim 8 comprising the additional step of mechanically agitating said composition on said screen under non-aqueous conditions before rinsing.ġ0. Rinsing the degraded ink residue with a pressurized stream of water.ĩ. A method of cleaning a printing screen having a residue of ink on the surface thereof which comprises the steps of treating at room temperature the printing screen ink residue with a non-aqueous biodegradable liquid composition consisting essentially of about 30 to 85% of N-methyl-2-pyrrolidone, about 10 to 35% oxygenated solvent and about 1-5% surfactant,Īllowing the composition to dwell on the ink surface for a sufficient period of time to degrade the ink residue, and The composition of claim 6 wherein the water dispersible oil is selected from the group consisting of polyalkylene glycol, ethoxylated lanolin and ethoxylated castor oil.Ĩ. The composition of claim 1 which additionally includes a water dispersible oil in an amount which functions in said composition initially as a repellant to a light water spray but allows a stream of water to remove said inks from said screen.ħ. The copmposition of claim 1 further comprising about 10 to 30% of an organic solvent selected from the group consisting of methylene chloride, 1,1,1-trichloroethane, dimethylsulfoxide and trichlorotrifluoroethane, and mixtures thereof.Ħ.
The composition of claim 3 wherein said surfactant is selected from the class consisting of nonionic, anionic and amphoteric surfactants and mixtures thereof.ĥ. The composition of claim 1 wherein the oxygenated solvent is selected from the group consisting of a butyl cellosolve, cellosolve acetate and cylcohexanone, and mixtures thereof.Ĥ. The composition of claim 1 wherein about 30 to 64% tetrahydrofurfuryl alcohol is substituted for an amount of said N-methyl-2-pyrrolidone or said oxygenated solvent.ģ. A printing screen ink cleaning composition for removing inks from images on said screen and for performance at room temperature consisting essentially of a non-aqueous biodegradable liquid mixture of about 30 to 85% N-methyl-2-pryyolidone, about 10 to 35% of an oxygenated solvent and about 1-5% of a surfactant.Ģ. PROCESS OF CONDITIONING THE SURFACE OF A LITHOGRAPHIC PRESS MEMBERĬomposition for use in eliminating oil and grease smudges from offset printing mats and platesġ. METHOD OF STRIPPING GELATIN EMULSIONS FROM POLYESTER SUPPORTS RUBBER PRINTING BLANKETS AND PROCESS FOR REMOVING AND CLEANING GLAZES THEREFROMĪPPARATUS FOR CLEANING HOLLOW CYLINDERS AND THE LIKE
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