What is CI ( central impression) flexo printing machine?

Summary 

CI flexographic printing press, also known as central drum flexographic printing press. Each printing unit surrounds a Central impression cylinder. The printing material is wrapped around a common impression drum for registration printing. Because the gears are directly driven, whether it is paper or film, even if no special control device is installed, it can still be overprinted very accurately, and the printing process is stable. It is often used to print color products. Some people have predicted that CI flexo printing will be the new mainstream of flexo printing in the 21st century.

Structure of CI Flexo printing machine 

The CI flexographic printing machine is mainly composed of 4 parts, namely, the unwinding and feeding parts, the printing parts, the drying parts and the rewinding and rewinding parts. In addition, there are generally measurement and control devices such as tension control, edge control, registration control, and print observation, as well as mechanical status monitoring and fault diagnosis systems.

Since the material is tightly wrapped on the central impression drum, the tension of the material is very stable, and the machine's registration accuracy is very high, which can reach ±0.1mm. This color registration accuracy is significantly better than the other two types of flexo printing machines. At the same time, the CI flexo printing machine occupies less space than the gravure printing machine, has lower requirements for site personnel, uses solvent inks and water-based inks, and is environmentally friendly and causes less environmental pollution. There is a worldwide trend of flexo printing replacing gravure printing. It should be said that the development of ci flexo printing machines is crucial. Based on the characteristics of high precision and stable tension, CI flexo printing machines are very suitable for printing exquisite film materials, such as shrink films, etc.

Advantages and Dis advantages 

Each printing unit of a CI flexo press surrounds a central impression cylinder. The printing material is wrapped around a common impression cylinder for registration printing. Because the gears are directly driven, whether it is paper or film, even if no special control device is installed, it can still be overprinted very accurately, and the printing process is stable. It is often used to print color products. Due to the limitations of the machine structure, it is difficult to achieve double-sided printing. At the same time, the distance between each printing unit is too short. When the ink is not properly dried, it is easy to stain the central impression drum, and the central drum needs to be wiped frequently. These are all problems that CI flexo printing machines need to solve. The machine consumes little energy and occupies a small area. However,