CI (Central Impression) flexo presses and inline flexo presses are two distinct configurations used in flexographic printing, each with unique characteristics suited for different applications. Here are the primary differences between them:
1. Impression Cylinder Design
- CI Flexo: Utilizes a single large central impression cylinder that holds the substrate while multiple printing units are arranged around it. This design ensures uniform pressure and consistent print quality across the entire width of the substrate.
- Inline Flexo: Features individual impression cylinders for each printing unit, with the substrate moving sequentially through these units. Each unit applies a specific color or part of the image, allowing for more modular setups.
2. Printing Process
- CI Flexo: The substrate is continuously fed around the central impression cylinder, which helps maintain tension and reduces the risk of register fluctuations, particularly beneficial for flexible materials.
- Inline Flexo: The printing process is sequential, where the substrate passes through each printing unit one after the other. This configuration allows for greater flexibility in color application and job changes.
3. Setup Time and Flexibility
- CI Flexo: Generally requires longer setup times due to the need to mount and align plates on the central cylinder. It is best suited for long runs with consistent print quality but less adaptable to frequent job changes.
- Inline Flexo: Offers quicker setup times since adjustments can be made independently for each printing unit, making it ideal for shorter runs or jobs that require frequent changes.
4. Speed and Production Efficiency
- CI Flexo: Known for high-speed capabilities, making it suitable for high-volume production runs. The design minimizes waste and enhances efficiency during lengthy print jobs.
- Inline Flexo: While capable of achieving high speeds, overall production speed can be affected by the complexity of print jobs and the number of colors being used. It is more efficient for varied short runs than CI presses.
5. Applications
- CI Flexo: Primarily used for flexible packaging applications where high-quality prints are essential. Its design is advantageous for materials that require stable tension during printing.
- Inline Flexo: More versatile in handling diverse substrates and inks, making it suitable for label printing and applications that demand quick changeovers and adaptability.
Summary Table
| Feature | CI Flexo | Inline Flexo |
|---|---|---|
| Impression Cylinder | Central impression cylinder | Individual impression cylinders |
| Printing Process | Continuous feeding | Sequential feeding |
| Setup Time | Longer | Shorter |
| Speed | High-speed for long runs | High-speed but variable |
| Production Flexibility | Less flexible | More flexible |
| Ideal Applications | Flexible packaging | Labels and short runs |
In conclusion, the choice between CI flexo and inline flexo presses depends on specific production needs, including print volume, substrate type, and flexibility requirements. Each configuration has its strengths tailored to different printing applications.
