Offset printing is mainly used for printing paper-based materials. Printing on plastic film has many limitations. Sheet-fed offset printing presses can be changed and are 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 presses are also constantly improving. A web offset press that can change the printing format has been developed. At the same time, a seamless web offset press was developed. The printing cylinder of this web offset press is seamless and has been identical to the web gravure press in this respect. Offset presses continue to improve on printing capabilities. Corrugated cardboard can be printed by modifying and retrofitting parts. UV prints can be printed with improved and retrofitted UV drying equipment. These improvements continue to expand the use of offset presses in the field of packaging and printing. Offset inks will soon be put into practical use. Offset printing here is another step.
Gravure printing, full color and three-dimensional, the printing quality is the best in various printing methods. And the printing quality is stable. The plate has a long life. Suitable for large quantities of printing. Gravure can print extremely thin materials such as plastic films. However, the gravure plate is complicated and expensive, and its benzene ink pollutes the environment. These two issues have affected the development of gravure. In particular, the reduction of a large number of large-volume prints, the short version also requires a large increase in the number of low-cost prints, so that gravure continues to lose market.
The main advantages of flexo printing are:
1. The equipment structure is simple and it is easy to form a production line. In the three major printing equipments of offset, concave and flexo printing, the flexo printing machine is the simplest structure. Therefore, the price of the flexo press is relatively low, and the investment in the printing enterprise equipment is small. At the same time, due to the simple equipment, easy to use and easy to maintain. At present, most of the flexo printing machines are connected with processing technologies such as soup gold, glazing, cutting, slitting, die cutting, indentation, punching, window opening, etc. to form a production line. Greatly improve labor productivity.
2, the scope of application and a wide range of substrates. Flexo printing can print almost all prints and use all substrates. Especially in corrugated printing in packaging and printing, there is uniqueness.
3. Widely used water-based inks. Among the three major printing methods of offset printing, gravure printing and flexo printing, only water-based inks are widely used in flexo printing. Non-toxic and non-polluting, it is beneficial to protect the environment, especially suitable for packaging and printing.
4. The cost is lower. The low cost of flexo printing has formed a broad consensus.