Anti-counterfeit printing--carbon paper printing technology (below)

Third, dry carbon paper transfer coating adhesion process on the impression cylinder

The colored transfer coating on the back of Haitian brand dry carbon paper is mainly non-toxic fatty acid salt solution and colored coating. Under the effect of the friction and printing pressure of the middle coating surface and the feed roller, the paper is pressed in the printing zone. Deformation, resulting in surface colored coating off powder (ie, colored paper powder), due to falling powder layer contains wax material composition, not easily scattered around the printing roller, while the impression roller pressure heating, easy to accept wax material adhesion, over time From less to more, the impression cylinder has a sticky coating roller, which has caused trouble for printing.

At present, there are two ways to solve the problem. First, a sheet-fed offset printing press is used to stick anti-sticking paper on the impression cylinder. The effect is ideal. Under normal circumstances, it can print 401,000 prints in a row. Some of them, such as Changchun City National Tax Printing Factory, Nantong Tongzhou Ticket Printing Factory, Hebei Provincial Taxation Ticket Center, Xuzhou Tax Printing Factory, etc., are all well-versed, and they do not stick anti-adhesive papers, but they have been printed 6500-7000 times. Manually wipe the roller once. The other is the offset offset offset press. The method is the same as the above. Due to the high speed and high output, using the above anti-adhesion principle, a sticking prevention device is installed under the impression cylinder of the form machine and is added to the high density sponge. 202 hydrogen-containing silicone oil, this method is safe and convenient. In addition, for the letterpress printing and the process of collation and labeling on the collating machine, the colored coating is pressed and transferred. The solution is the same as above, as long as a piece of anti-adhesion produced by our factory is affixed to the corresponding position on the platen or pressure roller. Paper can be achieved without transfer printing or coding, and it works well.
Fourth, with the choice of dry paper supporting the end of paper

It is recommended that the computer ticket be neutral 50-65g/m offset paper, and the minimum should not be less than 50g/m (flat hand invoicing is optional). At present, some factories reduce computer ticket invoices. The cost is 40-45g/m. As a result, due to the light weight of the paper, the bills formed have a poor stiffness. At the same time, when printing on a web printing press, due to the different tension control, it is difficult to find the telescopic rate of the two kinds of paper, resulting in waste and causing difficulties for the matching and user use, because the computer ticket is printed on the tax control machine Due to stiffness is not easy to malfunction. Here, I would like to remind the printing company that dry carbon paper is a neutral coating material paper. It must not be used with oily paper or carbonless paper. If there is a chemical reaction, the chemical reaction will occur and the color will not be transferred during copying. In the meantime, it will cause even greater losses. Please pay attention to the ticket printers and select the neutral bottom page and supporting paper correctly and reasonably.

V. Anti-sticking processing technology for web-page coding and spelling

When computer tickets are coded on a page, you should pay attention to the following requirements:

The control of the tension when producing multi-sheet bills must have an understanding of the shrinkage rate of each bill paper during production. When the amount of the bottom sheet matching dry-type carbon paper is different from that of dry-type carbon paper, the bottom sheet is To contradict, dry dry paper should be obeyed.

Dry carbon paper back coating contains wax material, it is not easy to absorb moisture and damp, but the printing surface is easy to absorb moisture and damp. The solution to this contradiction is: after printing, the printed product should be stored in a plastic bag and sealed, and then go to the matching page code .

Dry carbon paper is a physical type pressure-sensitive transfer hair color paper, non-chemical coating technology, marking the impression roller should be affixed to a single-sided tape to prevent the transfer of colored coating to the impression cylinder to affect the work of the code .

Six, stacked color security ink printing problems

Haitian multi-color security ink is developed by our factory according to the characteristics of anti-counterfeit ticket paper that can be transferred once. When the invoice is written, the handwriting is transferred to the invoice paper together with the colored transfer coating and becomes a stacked handwriting. It is not easy for the naked eye to detect. Only under the ultraviolet light, it displays colorful and vivid handwriting, so it can identify the authenticity of the invoice. Over the past few years, the application of tax documents in more than 10 provinces and cities, such as Jiangsu, Xinjiang, Hebei, and Shenzhen, has been effective.

When printing false-color-counterfeiting tickets, our factory's anti-counterfeiting inks can be properly added with 8# dry oil and red dry oil (additive weight is controlled at 3% by weight) in the southern region. If the ambient humidity is high, it can be properly added. Volume, otherwise it is appropriate to reduce the amount of ink on the print. In the northwest and northeastern regions, the cyp404 white dry oil produced by the Tianjin Ink Factory can be added to the anti-counterfeiting ink of our factory. The amount of the cyp404 white oil is not more than 10% by weight, which can promote the good effect of drying the inner and outer layers of the ink layer at the same time. After printing the stackable transferable anti-counterfeit ink, the printed products should be spaced at a certain interval and the front of the invoice printed.

Seven, hand-open bills glue head adhesion problem

The back transfer coating of Haitian brand dry carbon paper contains a wax composition, which feels smooth when printed and printed. Therefore, the conventional general glue is used as a glue head adhesive when binding, and the effect is not good, and it is easy to fall off or stratify. It is ideal to use NYG--504 latex-based vinegar-propylene copolymer latex as dry carbon paper adhesive. Before dry the paper, dry carbon paper paper should be cut flat and flat on the stack (note that the top can't be heavily compressed to facilitate glue. Permeate) Brush the NYG-504 glue with a brush to the tip of the glue. After 2-3 hours, divide it into volumes.

The above printing technology of Haitian brand dry carbon paper is only an experience summary of the national tax printing factories since 2000. There are many printing companies also have extremely rich advanced experience, and there are many uncertainties in printing. According to the actual situation of each factory in each area, different technical measures are adopted to solve.