Anti-counterfeiting nickel-clad steel coin and manufacturing process thereof
A production process and technology for coins, applied in the direction of coins, manufacturing tools, metal processing equipment, etc., can solve the problems of restricting the application of anti-counterfeiting technology and single anti-counterfeiting technology, and achieve the effect of increasing anti-counterfeiting performance, reasonable production process and high definition
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[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] The invention provides an anti-counterfeit nickel-clad steel coin, see figure 2 The difference between it and the prior art is that invisible patterns, miniature characters and secret marks are set on the front and back of the coin at the same time, edge roll characters are set on the side of the coin, the invisible pattern is a double-sided invisible pattern, and the depth of the invisible pattern engraving is 0.01-0.09mm, the angle of the engraving knife is 15-40°; the miniature characters are letter...
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