CI Flexo vs. Stack Flexo: Key Differences Explained


Flexographic printing has revolutionized the packaging and printing industry. Two of the most popular types of flexo machines are CI (Central Impression) flexo printing machines and Stack flexo printing machines. Each type serves specific applications and industries. This guide compares these two printing technologies to help you make an informed decision.

Table of Contents

  1. Introduction to CI Flexo and Stack Flexo Printing
  2. Basic Design and Structure Differences
  3. Substrate Handling and Compatibility
  4. Print Quality and Precision
  5. Applications and Industry Use Cases
  6. Speed and Productivity Comparison
  7. Space Requirements and Layout
  8. Maintenance and Operating Costs
  9. Environmental and Ink Considerations
  10. Which Flexo Printing Machine is Right for You?

1. Introduction to CI Flexo and Stack Flexo Printing

CI flexo machines use a single, large impression cylinder to hold all color stations, ensuring excellent registration. Stack flexo machines, on the other hand, feature multiple stacked print stations, each with its own impression cylinder.

2. Basic Design and Structure Differences

CI Flexo:
Compact design with color units surrounding a central drum. Ideal for high-precision jobs.

Stack Flexo:
Vertically arranged stations, enabling modular configurations for flexibility.

3. Substrate Handling and Compatibility

CI Flexo:
Best for thin, stretchable materials like plastic films and flexible packaging.

Stack Flexo:
Suitable for a wide range of substrates, including paper, cardboard, and films.

4. Print Quality and Precision

CI Flexo:
Offers superior registration accuracy, making it ideal for high-quality packaging.

Stack Flexo:
While capable of producing good results, registration may be less precise on complex designs.

5. Applications and Industry Use Cases

CI Flexo:
Primarily used for flexible packaging, food packaging, and high-quality labels.

Stack Flexo:
Commonly employed for paper bags, cardboard packaging, and simpler label designs.

6. Speed and Productivity Comparison

CI Flexo:
High-speed operation, often exceeding 400 meters per minute.

Stack Flexo:
Moderate speeds, typically 200-300 meters per minute, depending on the configuration.

7. Space Requirements and Layout

CI Flexo:
Requires less floor space due to its compact design.

Stack Flexo:
Needs more vertical space, making it suitable for facilities with ample headroom.

8. Maintenance and Operating Costs

CI Flexo:
Higher initial investment and maintenance costs, but greater efficiency in long runs.

Stack Flexo:
Lower cost of entry and simpler maintenance, ideal for smaller-scale operations.

9. Environmental and Ink Considerations

Both machines support eco-friendly options, including water-based and UV-curable inks. However, stack flexo machines are often preferred for jobs requiring minimal ink waste.

10. Which Flexo Printing Machine is Right for You?

Choose CI Flexo if:

You need high-quality, precise printing for flexible packaging or complex designs.
Speed and registration are critical for your projects.

Choose Stack Flexo if:

You require a cost-effective solution for paper-based packaging or simpler designs.
Flexibility in handling various substrates is essential.

For further assistance in selecting the right machine for your needs, contact Newtop Machine. Our team of experts can guide you through the process and provide tailored solutions for your business.