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How many printing methods are there in the printing industry at present?

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packaging printing is a printing industry that will never decline. There are many printing methods of packaging printing, and the commonly used printing methods are as follows: flexo printing is a direct printing method, which uses elastic raised image printing plate. The main advantages of flexographic printing are: simple equipment structure and easy to form a production line. Among the three major printing equipment of offset printing, concave printing and flexographic printing, flexographic printing machine is the simplest in structure. Therefore, the price of flexographic press is relatively low, and the equipment investment of printing enterprises is less. At the same time, due to the simple equipment, convenient operation and maintenance. At present, most flexographic printing machines are connected with processing processes such as Tangjin, glazing, cutting, slitting, die cutting, indentation, punching and windowing to form a production line. Greatly improve labor productivity. Wide range of applications and substrates. Flexographic printing can print almost all printed matter and use all substrates. Corrugated paper printing, especially in packaging and printing, is unique. Water based inks are widely used. Among the three printing methods of offset printing, gravure printing and flexo printing, only flexo printing is widely used at present. Non toxic and pollution-free, beneficial to environmental protection, especially suitable for packaging and printing. Low cost. The low cost of flexographic printing has formed a broad consensus abroad. Offset printing is mainly used for printing paper-based materials. Printing on plastic film has many limitations. The printing format of sheet fed offset press can be changed, which is more flexible. At present, the printing format of most web offset presses is fixed. Its application is limited. With the development of technology, web offset press is also constantly improved. A web offset press that can change the printing format has been developed. At the same time, a web offset press with seamless drum is successfully developed. The printing drum of this web offset press is seamless, which is the same as that of web gravure press. The offset press is also improving its printing function. After improving and adding some parts, corrugated board can be printed. After improvement and installation of UV drying device, UV printing can be printed. The above improvements continue to expand the application scope of offset press in the field of packaging and printing. Offset printing water-based ink will soon enter practical application. Here offset printing is another step. Gravure printing has full ink color and three-dimensional feeling. Among various printing methods, the printing quality is the best. And the printing quality is stable. Long printing plate life. Suitable for mass printing. Gravure printing can print very thin materials, such as plastic film. However, gravure plate making is complex and expensive, and its benzene containing ink pollutes the environment. These two problems affect the development of gravure printing. In particular, the reduction of a large number of prints and the large increase of prints requiring low price for short version at the same time have continuously lost the market of gravure printing& nbsp;& nbsp;

with the progress of modern science and technology, printing technology is constantly updated, the types of printing are becoming more and more complex, and the classification methods are also different. Some printing manufacturers often divide the printing types into book printing, plate printing, packaging printing, trademark printing, parts printing, etc. according to the nature of their printing business. According to different printing plates or printing equipment, some are divided into: lead printing (i.e. movable type printing), color printing (i.e. copper zinc plate color printing), offset printing, electrostatic printing, screen printing, collotype printing (glass printing), etc. According to the different printing materials, it can be divided into: plastic printing, self-adhesive printing, carton printing, metal printing, etc. The distinction between these categories has certain limitations. According to the layout structure of the printing plate, the printing types can be summarized as: relief plate, lithographic plate, gravure plate and filter plate (hole plate). Therefore, printing is mainly divided into four categories based on this. However, at present, the types of printing are not limited to the above four types, such as pressure-free inkjet printing, electrostatic printing, polishing and plastic reproduction. Printing occupies a certain proportion in the current printing production, especially in the decoration printing system, which will have a more and more important impact on the design of the original. The types of printing can be roughly divided into: relief printing, lithography, concave printing and hole printing (screen printing). What we contact most is lithography, which is often called offset printing. Most printed materials such as color pages of picture books and magazines are basically offset printing. Relief printing has the longest history and the most popular. The protruding part of the layout image and text accepts ink, and the concave part does not accept ink. When the plate is pressed tightly with the paper, the ink will be printed on the paper. Printing plate materials mainly include: movable type plate, lead plate, zinc plate, copper plate, photosensitive resin plate, etc. Some books, bills, envelopes and business cards are still printed in letterpress; Relief printing is also generally used for those requiring special processing, such as bronzing, silver, embossing, etc. This is the most common and widely used printing method at present. The image and non image are on the same plane. Based on the principle that water and ink are mutually exclusive, the graphic part accepts ink and does not accept water, while the non graphic part is opposite. The printing process adopts the indirect method. First, the image is printed on the rubber drum, the picture and text changes from positive to negative, and then the picture and text on the rubber drum is transferred to the paper. This printing method can be used for picture albums, pictorial advertising samples, calendars, etc. Concave printing is the opposite of relief printing. The text and the concave part of the layout carry the ink. The thickness of printing is related to the depth of the concave. If it is deep, it will be made, and if it is shallow, it will be light. Due to the different ink of concave printing, the printed lines have a protruding feeling. Coins, stamps and securities are printed with concave plates. Concave printing is also suitable for the printing of plastic film and silk. Due to the long plate making time and complex process of concave printing, the cost is very high. Also known as screen printing, if you have seen a teacher engrave a wax printing paper in primary school, you will better understand this printing method. Using silk cloth, wire mesh of metal and synthetic materials, wax paper, etc. as the printing plate, the graphic part is hollowed out into fine holes, the non graphic part is protected by printing materials, the printing plate is close to the substrate, and the ink is penetrated into the substrate with scraper or ink roller. Screen printing can be printed not only on flat substrates, but also on curved substrates. The color is bright and unchanged for a long time. It is suitable for printing labels, bags, T-Shirts, plastic products, glass, metal utensils and other objects

can generally be divided into four categories: relief, gravure, lithography and hole printing. The graphic part of the printing plate used in relief printing is raised, including engraving plate, movable type plate, lead plate, copper zinc plate, photosensitive resin plate and flexographic printing. Due to the great development of flexographic printing since 1980s, its printing mach
ine structure and printing substrate are different from general relief printing, so some countries regard flexographic printing as an independent printing type. The graphic part of the gravure printing plate is concave, which is divided into engraving gravure, photographic gravure and electronic gravure. The graphic part and non graphic part of the lithographic printing plate are basically in the same plane, which usually refers to offset printing, but in fact, lithography (basically eliminated) and offset printing (preserved as a unique process) also belong to the category of lithography. Hole plate printing is mainly screen printing, that is, it is made of screen, and the graphic part can be printed through ink rather than the ink impermeable printing plate of graphic part. Transcription plate mimeograph is also a kind of hole plate printing

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