How are scratch-off lottery tickets made?
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Fun2WinPrizes
ANSWERS: 2
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There is a special ink, called "scratch off ink." It is "an opaque printing ink formulated to be applied on a substrate to hide the information already printed on the substrate and to be scratched off to reveal the printed information." (www.aqmd.gov) "Substrate" just means a piece of paper or cardboard or whatever the ink is printed onto. Sub = "under" and "strate" = layer. So the substrate becomes the "under-layer" once it's covered with scratch off ink. The ink dries into an opaque film, that is scratch-off-able. There's a really detailed article about how to prepare these inks at: http://www.craigadhesives.com/PDF%20Files/Guide.PDF
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The material on scratch cards and lottery tickets is a latex ink. This ink is applied to printed material. A non-porous surface like enamel paper is used. The paper must then be coated with a release coating of varnish. After a release coating has be applied the scratch off material is then applied. Different processes take from 1 to 11 coats depending upon desired design, colors, and opacity for security. This material can be applied with an offset printing press, flexo, or using a silk screen process. One of the largest provider of scratch off cards in the world is ImpactWorldwide.com.
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