Printing anti-counterfeiting of the hottest smart

2022-10-03
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Smart card printing anti-counterfeiting

the printing plate and the barrel must maintain a certain gap, so that during printing, the printing plate and the barrel surface can only contact when the doctor blade acts, and the doctor blade leaves after passing. The size of the printing gap has a great impact on the printing quality. If the gap is adjusted improperly, high-quality products will not be printed. The printing gap is too small, which is easy to cause ink bleeding along the direction of the doctor blade

because the gap is small, it is bound to increase the printing pressure. In this way, the printing plate will be relaxed due to excessive stretching, and the printed graphics and texts will be out of shape. The size of the graphics and texts on the barrel is larger than that of the printing plate. The printing gap is generally 1 ~ 6 m m, with high printing accuracy, large frame area, tight wire, or curved surface printing, with a small value; General printing, large frame area, loose wire tension, plane printing, large value

③ printing speed and doctor blade angle

the doctor blade angle formed by the doctor blade and the layout and the moving speed of the doctor blade should be kept at a certain level. The angle of the doctor blade is generally 45 ° ~90 °, and the printing speed is generally 100~300mm/s. The smaller the angle of the doctor blade formed by the printing plate and the doctor blade is, the slower the moving speed of the doctor blade is, and the more ink is pressed out; The smaller the angle of the doctor blade, the better the press out of the ink

smart card is also called "integrated circuit card", which is called IC card for short. It is made by encapsulating the integrated circuit chip module with storage, encryption and data processing capabilities in a plastic chip base. Smart cards can be divided into single-layer cards and multi-layer cards. Single layer IC card is made of single-layer PVC raw material by direct printing or injection molding. According to the different structure and working mode, multi-layer IC card can be divided into contact card, non-contact card and combination card

1. Printing of smart cards

the printing of smart cards is basically the same as that of general magnetic cards. At present, offset printing and silk printing are mainly used. Offset printing generally prints photos and patterns with high accuracy, which can reproduce clear points and fine lines. Its plate making and printing cost is low, and the text and image are clear. Offset printing machines mainly include special PVC card printing machines or imported four-color color printing machines, which mainly use U V offset printing ink. The printing color is gorgeous, and the pictures and texts are clear, which is suitable for mass printing. First print on P V C card material, and then lamination, card punching, magnetic writing, embossing, etc. but because offset printing uses U V ink, the protective film is easy to fall off. Therefore, 2mm blank space should be left around the plastic magnetic card in the design. It is best not to use fluorescent ink, and full attention should also be paid to cutting or processing

silk printing has the characteristics of thick ink layer, good covering power, rich texture, strong light resistance, bright colors, and good printability for ink and substrate. Therefore, silk printing is the main printing method of smart card

smart card printing usually adopts resin heat curing ink and solvent based soft plastic printing ink. The choice of ink should mainly pay attention to the two elements of strong adhesion and high hiding power, which is also the key of card printing. Adhesion mainly affects the adhesion fastness between ink and card substrate, while coverage mainly affects the printing quality. Therefore, when adjusting the viscosity of ink, we should choose a solvent with good adaptability to ink. When mixing ink, we should control the amount of solvent. Too much solvent, low ink viscosity, easy to flow to the back of the plate, causing the printing pattern to become paste and thick; The solvent is too little, the ink viscosity is high, and it is easy to cause blocking in printing, making it difficult to reproduce the printed pattern completely. In addition, during the printing process, with the continuous volatilization of the solvent, the viscosity of the ink will gradually increase. Therefore, it is necessary to constantly promote the ink on the plate and constantly supplement the adjusted ink to make it have a stable viscosity. The color matching of ink should be based on the basic color, and the number of colors of ink should be as few as possible. Generally, there are 3-4 kinds of intermediate colors. If you use too many ink colors, it will be more difficult to get the desired hue. There are often a lot of bubbles in the blended ink. The ink with low viscosity will naturally defoaming after a certain period of time; For those with high viscosity, about 1% defoamer should be added and fully stirred. The drying time of ink is related to the size and characteristics of IC card printing pattern. Generally, the drying time of the full version pattern is long, and the drying time of the text and small color blocks is slightly short. However, it should be noted that the newly dried magnetic card has elongation due to the heating of the material, so it must be cooled (generally cooled for about 10min) before printing the next color. If the cold air can be blown to the printed matter, the effect will be better. The production quality of the printing plate plays a key role in the printing quality. Because domestic yarn is not ideal in elongation and wear resistance, imported nylon yarn is often used. Generally, 150 ~ 350 mesh silk is selected for printing. With the development of aircraft manufacturing technology, but for gold and silver ink printing, the mesh size should be considered when selecting the mesh size to ensure that it can pass through the mesh diameter. Generally, 160 ~ 250 mesh is suitable. Aluminum alloy frame is better. When selecting the frame, attention should be paid to the smoothness of its four sides, whether the frame is distorted, etc. When the old frame is stretched again, the frame should be ground flat with a grinding wheel. Pay attention to the quality of the stretched version, and ensure that the tension of each set of version and the four corners of each version are consistent, and the tension is generally controlled at 14 ~ 15N/cm. For the angle of stretching, except that some full-size patterns can be stretched directly at 90 °, the general pattern should be stretched diagonally as much as possible to avoid sawtooth on the edge of the magnetic card pattern and improve the clarity and printing quality of the text

practice has proved that the tension angle of 22.5 ° is more appropriate. The scraper is preferably made of polyurethane, which has strong solvent resistance and good wear resistance, and can withstand high temperatures below 90 ℃. The scraper should be grinded frequently. When printing each time, it is necessary to confirm whether the blade of the scraper is normal. The scraping angle, pressure, sharpness and smoothness of the blade have a direct impact on the printing quality. In addition, poor control of the scraping angle, printing pressure, hardness of the squeegee and printing speed of the blade will cause the color difference fault. Therefore, it is necessary to pay attention to the continuous accumulation of experience and reasonable control during operation. At present, magnetic card printing is mainly plane printing and roller printing. Plane printing machine is the earliest mechanized printing machine, which is widely used in semi-automatic and full-automatic models; The biggest feature of the drum press is that the printing table is cylindrical. Compared with the flat printing machine, the roller printing machine has faster printing speed and better product quality. However, the requirements for operation and precision adjustment are higher. No matter what type of printer, it is very important to adjust the distance well. The distance is small, because the version fails to pop up in time after inking, resulting in the version improving the company's image and brand value, and the surface contact with the substrate, which is easy to produce the phenomenon of ink seepage and dispersion, resulting in difficulties in inking; If the distance is too large, it will not be easy to recover after the plate is extended too much during embossing, which will cause errors between the printing size and the layout, which will have the greatest impact on overprint, and will cause faults such as inaccurate overprint. In addition, pay attention to adjust and control the matching relationship between the distance and the size of the plate frame, ink viscosity, and plate tension

at present, the confirmation card can only print simple words and graphics, and cannot print high-quality color patterns. Therefore, in order to make magnetic cards with large quantities and high printing quality, printing and offset printing are usually combined to make use of the advantages of the two printing methods. Generally, large areas of colored parts are printed with silk, while thin lines or small text parts are printed with small offset printing machines to make up for the shortcomings of printing. However, due to the fact that printing is carried out through flexible plate printing, and the tension of each plate cannot be completely consistent, it is easy to cause a certain error between the size of the magnetic card pattern and the size of the plate making film. In this way, in the combined printing of printing and offset printing, it will produce the difficulty of registration error. The main solution to this problem is to adjust the printing method. Generally speaking, we should try to print first and then offset. In this way, offset printing can be adjusted according to the actual size of printing. When the size of its mouth is different from that of the trailing tip, the vertical size of the offset text can be adjusted by adjusting the blanket of the offset press and changing the thickness of the printing package, while the horizontal size can be adjusted by the plate making film according to the actual size of the printing. In this way, the registration problem of printing and offset printing is basically solved

2. Anti counterfeiting printing of smart cards

as an important information medium, the anti-counterfeiting treatment of the surface, as an important part of the distribution management of the whole system, needs to be seriously considered. The technical treatment of the card surface is mainly color pattern printing. The surface pattern printing of IC card mostly adopts offset lithography technology. The characteristics of offset printing on plastic surface not only make the card artistic and collectable, but also greatly improve the precision, particularity and complexity of production, and increase the difficulty and risk of forgery. Some simple monochrome patterns, words or anti-counterfeiting inks are also printed with silk. In addition, some special signs can also be used, such as fluorescent safety image printing, printing discoloration marks, laser cannot be too long or too short to engrave signatures and images, micro line technology, complex hologram marks, micro frames and safety background structures, etc

at present, color portrait PVC cards have been widely used. It can not only print different color photos, names and other personalized information on the card, but also change the disadvantages of the previous plastic sealed card, such as single function, easy to forge, easy to damage, easy to open glue, no waterproof and so on, forming the characteristics of now two-layer solid, waterproof, good image effect, and diverse functions, and can adopt various functions such as portrait recognition, attendance, access control, consumption and so on. There are two ways to make p V C color portrait cards. One is to use a heat transfer card printer to print directly on the surface of the blank card, which costs more; The other is to use a color ink-jet or laser printer to print the content on a special PVC film base, and then use the lamination method to make the finished product through hot pressing, punching and card punching

in order to improve the anti-counterfeiting effect of IC cards, there are now multi-layer invisible photoelectric cards. It is a major improvement on photoelectric cards with open holes and bar code cards with clear codes. Its structure includes card base, connecting coating, information layer, protective layer, invisible layer and coating. Kaki is generally made of plastic materials such as PVC, ABS, pet, etc. the connecting coating is generally made of PVC material. It is a special material, which can firmly connect the information layer of powdery materials with kaki materials and completely penetrate. The information layer is mainly made of carbon powder, and its optical properties are very different or even opposite to those of the card base material. The protective layer can be made of thin PVC material, which is used to protect the information layer and the connecting coating from the influence of the invisible layer. The invisible layer can be made of materials with good infrared transmission and low visible light transmission, such as invisible ink, PVC film with dark color that transmits infrared light, etc. Its function is to cover the area composed of information points under the invisible layer, so that it can not be found during visual inspection, so as to achieve the purpose of invisibility. PVC film can be used to cover the film. Its function is to protect the invisible layer from being exposed in the outermost layer, so as to improve the wear resistance of the card

when making multi-layer invisible photoelectric cards, ordinary materials can be used. The prepared information is directly printed on the card base material through the laser printer. Finally, the multi-layer materials are pressed into cards through the heat sealing lamination process, which forms an anti-counterfeit card. This kind of card not only has good anti-counterfeiting effect because the information layer is hidden and the anti-counterfeiting information cannot be observed by the naked eye, but also has strong wear resistance and bending resistance

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