technical data sheet NAZDAR SCF Scratch Off Solvent-Based Screen InksSCF Scratch Off inks are specially formulated to be printed on lottery tickets and games that are typically given away by retail outlets. These inks form a very opaque film that hides the "prize" until the ink is removed by scratching with a fingernail or coin. The card stock should be coated with a UV curable screen print clear such as the PSLC 294 UV Litho Clear to seal the cardstock prior to the application of SCF Scratch Off inks. An under-print of a clear provides the best adhesion and scratch-off properties of the SCF Scratch Off inks. |
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Substrates
Substrate recommendations are based on commonly available materials intended for the ink's specific market when the inks are processed according to this technical data. While technical information and advice on the use of this product is provided in good faith, the User bears sole responsibility for selecting the appropriate product for their end-use requirements. Reference the 'Quality Statement' at the end of this document. User InformationMesh110-195 tpi (43-77 tpcm) monofilament polyester mesh for most applications. StencilUse direct emulsions and capillary films which are solvent resistant. Squeegee60-80 durometer polyurethane squeegee. CoverageEstimated 600 - 1,000 square feet (55 - 93 square meters) per gallon depending upon ink deposit. Reference www.nazdar.com for examples of coverage calculations. PrintingSCF Scratch Off Inks are formulated to be press ready. Add only enough ink to the screen to be able to print for 5-10 minutes. Add additional ink in small increments throughout the print run to maintain screen stability. Thoroughly mix the ink prior to printing. Improper mixing can lead to inconsistent color and ink performance. Maintain ink temperature at 65°-90°F (18°-32°C) for optimum print and cure performance. Lower temperatures increase the ink viscosity, impairing flow and increasing film thickness. A heavier ink deposit will provide increased opacity. Elevated temperatures lower the ink viscosity, reducing print definition and film thickness. |
Pretest to determine optimum printing parameters for a particular set of ink, substrate, screen, press, and curing variables/conditions. Nazdar does not recommend inter-mixing of SCF Scratch Off Inks with other inks. Drying / Curing ParametersSCF Scratch Off Inks dry by solvent evaporation in 10 to 20 minutes depending on ambient conditions. Force dry in seconds at temperatures of 90 F° to 160 F° (32 C° to 71 C°). Use of excessive heat may cause ink not to scratch off. Good air circulation is necessary to remove the vaporized solvents. Clears / VarnishesClear Coat: Print PSLC 294 UV Litho Clear beneath the SCF Scratch Off inks to seal the card stock to provide a surface that can be scratched without damaging the underlying graphic. For best results, print PSLC 294 UV Litho Clear through a 355-380 tpi (140-150tpcm) mesh and UV expose to a single medium pressure mercury vapor lamp emitting output of 140-160 mJ (millijoules) /600+ mW (milliwatts). Prior to a full production run, it is the responsibility of the printer:
Common Performance AdditivesThe market specific performance properties of the SCF Scratch Off Inks should be acceptable for most applications without the need for additives. When required, any additives should be thoroughly mixed before each use. Prior to production, test any additive adjustment to the ink. Inks containing additives should not be mixed with other inks. Thinner: Use 5500 Reducer to reduce the viscosity of these inks. Add up to 10% by weight. |