There are many kinds of scratch card printing process, and there are many kinds of anti-counterfeiting printing process. In the process of anti-counterfeiting printing, there will be a lot of business of printing numbers. However, due to the particularity of screen printing, it is impossible to print numbers in the way of code printing, so we can only adopt various simple methods according to local conditions. The following will be Wei anti-counterfeiting printing technical personnel for you to introduce this process.
Take the screen printing key card or special scraping card for example, it uses 1 mm transparent plexiglass, the back is sprayed with flash silver spray paint, the back is carved by mechanical engraving machine, and then sprayed with color paint. It is made on both sides and bonded with two sides of glue in the middle. Due to the large amount and small handwriting, three sets of colors and small numbers are added. If the engraving machine is insisted on, it will undoubtedly be time-consuming and time-consuming, and there are many defective products, so screen printing is adopted It can solve most of the problems, but it is easy to have problems in the number printing. One is that it is impossible to make one page for each number; the other is the problem of number matching and alignment. Although the engraving machine can be controlled to make numbers during blanking, it is not up to the requirements. It is also very troublesome to register engraving after printing. In this case, perspective alignment printing can be made by using the transparency of plexiglass.
According to the technical personnel of anti-counterfeiting printing, first make small number plate, typesetting method: 0000, 0010, 0020, 0030, 0040, 0050, 0060, 0070, 0080, 0090 as a group, and then make 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 as a group. (the number of 5-6 digit groups is increased by the first group of 10, and the vertical group of 0-9 can be used). Such a small version can spell out tens of thousands of groups of numbers, which can be printed after manuscript or version In order to avoid printing skewness, mark the upper and lower base lines of the numbers on the platen to avoid printing skewness. When printing, 10 pieces are stacked separately and printed according to the number sequence. First 000 (the tail o is sealed with glue), 9 pieces, and then the base map is translated to print 000, 1. In the same way, the large number (the first group is printed), and then the small number (mantissa) is overprinted separately. The advantage of this is that the number continuous printing will not be disordered, and there will be no dry plate phenomenon For opaque objects, this method is not suitable. You can only make positioning marks according to the shape of the object, or use transparent film overprint alignment method, or fix the screen clip on the movable slide bar or chute, align with the position of the substrate, and locate with the pin. Each (Group) number has a card, so that each (Group) number moves, one bit is clamped.
The above is the printing method of positive figure number. For the negative figure number with background color, such as house number, street name above and number below, or batch medal requirements are the same, the number is exposed and some need to make outline line, overprint number is more difficult, just like some specially made scraping card, because the printing must be consistent in color and can not have a border, the negative figure number can be printed It is not practical, screen printing is not like offset printing ink layer thin, offset printing can use overprint, the number edge ink thin overlap is not obvious, no matter the translucent ink screen printing effect is incomparable, at this time can use tear off ink or easy to remove with tape ink, with positive figure number Collage printing method, but must be positioned accurately, after drying, then use the negative graphic version (number position) All exposed) scraping can be done. Pay attention that the scraping should not be too fast, the ink should not be too sticky, and the screen should be thick, so as to print good finished products. After drying thoroughly, use adhesive tape to remove the ink layer at the number position to expose the empty bottom.
