Introduction to the printing process of the hottes

2022-08-07
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Introduction to stamp printing process

release date: Source: China packaging

how many people's memories were carried by stamps in the past, but now they are slowly fading in our memories. But there are always some moments. I wonder if you will suddenly remember the time when you wrote letters in your memory. Today, when the stress is lower than the yield limit and there is no obvious plastic deformation, China paper starts from the stamp printing process to explain the effective packaging printing process

if philatelists can encounter a stamp with an unimaginable appreciation, it will attract everyone's keen attention just as lottery winners win the lottery. Previously, a stamp from the cultural revolution period, which was popular all over the country, appeared in the Hong Kong auction market and was sold in 368 Hong Kong. It was a sky high price and attracted the attention of many friends

from the perspective of printing technology, stamps, like RMB, are just a special kind of printed matter, which is not of great value in itself. So, as an ordinary printed matter, how are stamps printed

stamp printing

gravure printing is mainly used for stamp printing, because gravure printing has good anti-counterfeiting property. It is widely used in anti-counterfeiting printing. Gravure printing is characterized by a large amount of ink. Therefore, the thickness of lines and the thickness of ink in gravure printing vary widely. The graphics and texts have a concave convex feeling. The layers are diverse, the lines are clear and easy to identify, which brings great difficulties to counterfeiting. Gravure is the earliest printing technology used in the field of anti-counterfeiting

in terms of stamp printing, China's manual engraving intaglio technology is world-class. The knife style and artistic style of hand carving are incomparable to other plate making methods. The portraits of banknotes in China and foreign countries have always been carved by hand, which shows the characteristics of characters in a unique style. The hand carved deep plate prints products with thick ink layer, good hand feeling and strong anti-counterfeiting. However, there are two problems with manual engraving. First, the efficiency is low, which is not suitable for the needs of rapid production. In addition, manual engraving must use a carving knife, and the engraved plate pattern is a font groove on the section in the depth direction. The ink storage of this shape groove is not very good. If the plate wiping method is adopted, the ink in the groove is easy to be wiped out, and the printed line ink layer is not full and thick enough. These are two problems that must be solved. In terms of efficiency, when carving portraits in foreign countries, the enlarged image copper plate is corroded first, and the enlarged image copper plate is used as the template after manual carving; Use this template as a mold, and use a shrinking machine to shrink and engrave a human figure that meets the specifications on the steel plate. Sensible heat, engraving copper plate is easier and more efficient than directly engraving steel plate. As for solving the problem of groove shape, it is necessary to tap the potential of corrosion gravure process. Etching intaglio process is to directly etch the single sheet graphic film on the copper plate coated with photosensitive materials. The copper plate has low hardness, and other plates with high hardness can be pasted on the back of the copper plate. Or charge a layer of red copper on the hard plate lining. The corroded red copper printing plate with improved strength is pressed on a 1mm thick plastic plate with a hot press. The plastic plate is accurately cut and high-frequency welded into a large plastic printing plate. The large plastic plate is used to turn the copper plate, then the copper plate is turned into a nickel relief plate, and finally the nickel intaglio plate can be used on the machine. The gravure plate made by this corrosion process has a lettered groove, good ink storage performance, thick ink layer and strong hand feeling. In addition, the corrosion method can be used to make very small characters and thin lines. Now the size of the miniature characters can reach 150-m. in this way, the small gravure miniature characters can only be seen clearly under the magnifying glass

the intaglio invisible picture and text made by etching method has good refraction and obvious color change. At the same time, this method solves the problem of ink storage of gravure plate pattern and the low efficiency of manual engraving. However, the etching method needs to adopt the processes of plate making, electroplating and repeated reproduction to make the machine printing plate, which also has the problem of low efficiency. In order to solve this problem, people have been exploring the technical problem of whether the etching method can be used to directly make the machine gravure plate

application of laser holographic anti-counterfeiting technology in stamp printing

laser holographic anti-counterfeiting technology is a high-tech anti-counterfeiting technology that appeared in the 1980s. It uses the basic laws of scattering, reflection, transmission, diffraction, interference, absorption and so on generated by the interaction between light and matter to obtain a special visual effect. At present, the technical means of optical anti-counterfeiting are multilayer dielectric film structure, grating structure and various types of laser holography using the concept of information light. It is characterized by the emergence of the molding process, which enables the low-cost mass production of laser holograms. In addition, the hologram itself contains rich information, and the holographic logo can not be simply copied by ordinary photographic plate making and printing technology. Therefore, the molding hologram is quickly applied in anti-counterfeiting and security

it was in the late 1980s that the laser holographic anti-counterfeiting technology was applied to stamp printing. The world's first stamp with holographic anti-counterfeiting pattern was an 8 shilling stamp issued by Austria on october18,1988. The stamps were displayed at the International Chamber of Commerce export products exhibition and were very popular. There are three holographic patterns in the center of the stamps, and the sailboat shape composed of a letter and madeinaustria, which symbolizes the meaning of export. Later, on december3,1989, the U.S. Postal Department issued a 25 cent advance envelope (a hologram was pasted in the square opening in the upper right corner of the envelope, which was made by the U.S. banknote holography company). The hologram showed that a spacecraft was boarding the orbital space station

next, Finland, Hungary, Poland, Canada, Mongolia, Australia and many other countries have issued stamps with this anti-counterfeiting technology, which makes the holographic anti-counterfeiting technology play a great role in stamp anti-counterfeiting production. China also issued such stamps in 1996. First, a commemorative cover was issued for the Hong Kong 98 stamp exhibition. The commemorative cover is pasted with a small circular holographic pattern, the picture is a panda holding bamboo, and the stamp book is a picture of green bamboo forest. Later, in order to celebrate the 22nd China Stamp Exhibition, commemorative stamps with holographic patterns were issued on july18,1996. The picture of the stamp is a statue of a person flying around the earth. Around the stamp are the designs of air envelopes, planes, ships, trucks, etc. In addition, two postal postcards with holographic stamps were issued on february15,1994. The picture of a holographic stamp on one postcard welcoming Chinese VIPs is a picture of a Victorian female worker in 1685. The picture of the postcard with this stamp is the Hong Kong seashore in 1920, and the hologram on the other postcard is a picture of the head of Queen Elizabeth II of Britain. The picture of this postcard is the Hong Kong seashore in 1933

am line and FM point

point change, as a new anti-counterfeiting technology, is attracting people's attention. It is gradually being used in the anti-counterfeiting printing of tickets, with good results. Its principle is to transform the continuous tone image, text, graphics, etc. into a small dotted line with certain directivity, and form a latent image by changing its angle. This pattern can not be seen with the naked eye, but it will appear after digital scanning. Frequency modulation points are used to transform an image into tiny dots. The density of dots is used to express the depth of image density. If you use a copier to copy, you will produce moire. The United States has adopted this anti-counterfeiting method in some stamps. The direction of the offset printing point of the stamp as a whole is regular, and only the point direction is changed in the latent image part. Nothing can be seen with the naked eye, but it can be clearly seen on a postmark detector with a biconvex lens

perforation anti-counterfeiting

this is one of the commonly used steps in stamp anti-counterfeiting. As we all know, the stamps have to be perforated after they are made. The purpose of perforating stamps was to facilitate the tearing of stamps. Later, people gradually used the shape, arrangement and density of perforations for the anti-counterfeiting of stamps, so as to prevent the imitation of stamps and improve their collection value. Nowadays, the perforation anti-counterfeiting technology has been greatly improved, which has become an important aspect of stamp anti-counterfeiting

in addition to the above, stamp anti-counterfeiting includes image anti-counterfeiting, special printing ink anti-counterfeiting, secret mark anti-counterfeiting, etc. In short, most of the technologies and materials used in ticket anti-counterfeiting can be used in the development of a series of new materials such as high-performance carbon fiber, high-end industrial ceramics and lithium battery separator

with the continuous development of anti-counterfeiting technology and materials, the anti-counterfeiting after-sales service promise of stamps will develop to a higher level in the future. It can basically use the high-tech materials and technologies used in ticket anti-counterfeiting. Of course, the anti-counterfeiting of stamps is not as urgent and important as that of banknotes, because the anti-counterfeiting of stamps has no great significance in the use value (i.e. mailing), mainly because their face value is relatively low, Counterfeiters spend more energy than they gain. The real significance of stamp anti-counterfeiting lies in the collection value of treasures. However, since the collection value is proportional to the age and the number of this variety, if the age is long, the paper of stamps must be different from those newly printed at the time of counterfeiting, and counterfeit products are easy to be found and lose their value; If counterfeiters print in large quantities, they will lose the meaning of rare varieties, so they are easy to be found and lose their value. Therefore, in general, stamp anti-counterfeiting is not as important as banknote anti-counterfeiting. However, this does not mean that stamp anti-counterfeiting is not important. This can be illustrated by the cases of rare stamp counterfeits in the world

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