What Is A CI Flexo Printing Machine And How Does It Work

The question involves key technology in the printing industry. The CI flexographic printing press is the core equipment for efficient flexographic printing. Basically, it utilizes a satellite (central impression) structure in which multiple printing units operate synchronously through central impression cylinder. Mainly used in plastic film, paper and other flexible materials for continuous printing.
I. Core Features the CI Flexographic Printing Press
Unique Structure: All printing units are built around a large central impression cylinder, rather than a traditional single lithography cylinder, ensuring more uniform printing pressure.
Very efficient: It supports continuous printing of multiple colors (usually 6-10) without transferring materials between units, greatly reducing register errors and production time.
Scope of application: can be printed on various flexible substrates such as film, paper, aluminum foil, and so on, commonly used in food packaging, labelling, wallpaper, etc..
ii. CI Flexographic Printing Press Workflow
It works in four core steps, all of which are continuously automated:
Substrate Unwinding: A roll of flexible substrates,such as plastic film, unfurls through an unfurling mechanism, while the tension control system maintains the substrates flat and wrinkle-free. Multi-color printing: The substrate moves at a constant speed on the surface of a central impression cylinder, while the various printing units around the cylinder operate in sequence.
Each printing unit consists of a plate cylinder and an anilox roller.
The anilox roller first extracts ink from the tank and then controls the thickness of the ink with a doctor's blade.
The ink is then transferred to the image portion of the plate roller, which prints the image onto the substrate.
Drying and curing: After each color is printed, the substrate immediately goes into the corresponding drying unit (usually hot air drying or UV curing) to ensure that the former color dries before the next color is printed, preventing color mixing.
Wrap the finished product: After printing all colors and drying completely, rewind the substrate into a large roll using a winding mechanism, waiting for subsequent processing steps, such as stripping and bagging. III. Core differences from Traditional Unit-Type Flexographic Presses
The main difference between the two is the structure of the plate, which directly affects the quality and efficiency of printing. The detailed comparison is as follows:
Comparison Dimensions: CI Flexographic Press (Satellite) vs. Traditional Unit-Type Flexographic Press
Impression Structure: A single, central, large roller shared by all units. Each printing unit has its own separate impression roller.
High register precision: no substrate stretching, tolerance control ± 0.1mm. (The following text seems irrelevant: Low, substrate tensile error may occur during unit transfer.)
Production efficiency: can process multiple colors at once, suitable for large-scale production. (The following appears to be unrelated to this site: low conversion rate, require for color-by-color conversion rate, resulting in lengthy changeover rate and adjustment times)
High equipment costs: complex structure, difficult to manufacture. (The text seems irrelevant: simple structure, low investment threshold.)