Application and development of the hottest flexogr

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The application and development of flexographic printing

first, the characteristics of flexographic printing technology

flexographic printing machines generally use corrugated rollers to transfer ink, with high ink transfer control sensitivity and convenient operation. Please re tension the tensioning wheel for flexographic printing; The products have bright colors and strong advertising. Compared with gravure printing, they can produce prints that meet the quality requirements at a relatively low price and a shorter production cycle. It has been listed as one of the four major printing methods today

the flexible plate adopts a prefabricated photosensitive plate, which has good resolution and can produce 133 line/inch and 150 line/inch images (currently, 100 ~ 120 line/inch pneumatic measurement accuracy is commonly used in packaging and printing, which is much higher than the level 0.5 (Advanced) standard). The printing resistance of the printing plate can reach 500 ~ 1 million prints. The plate making process includes exposure, washing, drying and other processes. With the wide application of flexographic printing, a multi-functional plate making machine with three processes together has appeared, which greatly shortens the plate making time and has little investment in plate making equipment. It is very suitable for small batch and miscellaneous short plate printing, which meets the current packaging and printing needs of our country

the flexographic printing machine adopts a short ink transfer system of metal roller, which can meet the printing quality requirements by almost 2 ~ 3 turns. The printing pressure is light, and it is not easy to break the web, which can save paper and produce good economic benefits

flexographic printing inks include alcohol based, water-based, polyamide type, acrylic type, UV type, etc. In particular, water-based inks are pollution-free, do not affect health, and will not burn. The connecting materials in the inks have strong adhesion to paper (or plastics). The inorganic salt and organic salt pigments used in the inks can meet the requirements of the three primary colors. In addition, they are added with pigment wetting and diffusing agents, surfactants, etc. the ink color density is high, the contrast is good, the imprinting impression is resistant, and there is no ghosting. Even if a large area of ink block is printed, the ink will not penetrate into the back of the paper. Therefore, water-based inks not only improve the printing performance, but also meet the requirements of today's environmental protection

II. Application status and existing problems of flexographic printing

at present, most carton printing is composed of several single equipment, such as relief printing machine, manual die cutting machine, manual bronzing machine, etc. The process and operation are complex, and the stability of product quality is poor. There are few manufacturers with large-scale production capacity that can produce high-end color packaging boxes

in countries with developed printing industry, flexographic printing accounts for% of the whole packaging printing industry. Since the introduction of flexographic printing b-constant brush equipment in China in the late 1970s, it has met the needs of the rapid development of flexible packaging printing, but many manufacturers are still difficult to print high-quality color layered prints, which are only limited to printing lines or real block prints. At present, the main reasons for the slow development of flexographic printing are the following three points:

1. Low technical level and cognitive bias. There are special requirements for color separations and plate making of flexographic printing. The dot type and dot angle of color separations are quite different from offset printing and gravure printing. The printing plate is elastic, and when wrapped in the plate cylinder, it will also produce elongation deformation. This requires operators to have a high technical level, master the characteristics of flexographic printing, and have a certain aesthetic ability, otherwise, it is easy to have quality problems. Many manufacturers doubt whether flexo can print high-quality products, and do not pay attention to the quality awareness and operation training of employees

2. The equipment is not matched. Flexographic printing is pasted on the plate cylinder after plate making. If pasted directly on the machine, it is difficult to ensure the registration accuracy of the plate. Therefore, it is necessary to purchase a plate loader with accuracy detection function to ensure the registration accuracy

3. improper selection of embossing roller of flexographic printing machine. When printing color layered plates, the embossing roller should be about 400 lines. Different colors should be selected according to the ink transfer volume. If the number of lines is the same, it is difficult to achieve the desired effect

III. The development prospect of flexographic printing technology

after the application of computer technology, flexographic printing realizes automation of positioning and registration, tension control, screen display quality tracking and feedback, saves time and reduces the difficulty of operation. The computer can also be used to program various complex operations and necessary parameters for input or storage. When printing the same items repeatedly, enabling the storage device can make complex operations simple and easy

flexographic printing is especially suitable for small batch and multi variety packaging printing. With the improvement of flexographic machine supporting technology, materials that were difficult to print in the past, such as extremely thin films, non ink absorbing materials, can be printed at high speed. If directly equipped with a variety of multi-functional post press processing equipment, such as die cutting, box making, bronzing and other follow-up work can be completed at one time, it can shorten the time, reduce paper consumption, and stabilize the quality of printed matter. Therefore, it has great market potential in packaging and printing

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