Breaking through printing speed – but stuck with «FeiMo ink leakage»?

In today’s printing industry, where high-speed printing at speeds exceeding 300 meters per minute is commonplace, many printing plant owners and technical supervisors frequently encounter this challenge: as machines operate at increasingly higher speeds, ink splashes become more pronounced; while colors may appear accurate just one hour before startup, solvent vapors during the latter part of the printing process can lead to critical color variations.

In fact, the secret behind enabling leading international brands (such as Bobst, W&H, and Comexi) to balance both “high speed” and “optimal color accuracy” lies in the final safeguard of their mesh roller system – the chamber-based dual-squeegee system with end sealing.

What is an engraved roller end seal (End Seal)? Why is it essential for high-end printing presses?

In precision flexographic printing and coating processes, the Anilox roller is responsible for micron-level precise ink transfer. To prevent ink splashing, the ink chamber must remain completely sealed.

The End Seal (also known as the end seal disc or ink chamber barrier) is a geometric sealing component installed at the closed end of the ink chamber to ensure a rigid fit against the roller body. Acting as the “gatekeeper” of the ink chamber, it securely prevents every drop of water from leaking under extreme operating conditions—characterized by high rotational speeds, high pressure, and intense friction.

Why have printed rollers with end sealing become synonymous with ‘high-end’

• Abandon momentum to achieve maximum control over “zero chromatic aberration”.

The traditional open ink delivery system exposes the ink directly to the air, causing the solvent to evaporate rapidly and leading to continuous changes in ink viscosity. In contrast, a sealed roller system with an end-seal completely isolates the ink from the air. Whether for orders spanning 10,000 meters or 100,000 meters, color saturation remains consistent throughout every meter – from the first to the last. This represents our proven capability, which is precisely what enables us to secure high-end cosmetic and luxury packaging orders.

• Patented sealing technology ensures maximum protection – eliminating flying ink and shop contamination.

When the roller operates at ultra-high speeds, the centrifugal force is extremely high. The high-end sealing system utilizes polymer adhesives with a “memory effect,” high-density specialized foam, or impregnated felt. Under high-speed tension, these materials not only prevent heat-induced deformation but also ensure a tight fit around the edge of the screen printing roller. This eliminates inking and leakage, creating a clean, automated workshop that complies with modern environmental standards and ISO certification requirements.

• Protects expensive ceramic mesh rollers, extending their service life by 2–3 times.

The ceramic mesh surface of the mesh roller is extremely fragile and is particularly susceptible to uneven scraper force or wear caused by hard objects. High-end end-sealing systems feature precise geometric curvature and self-lubricating properties. These systems balance scraper pressure to prevent scratches on the mesh roller surface (which can cause severe “Score lines”), protecting high-value assets worth hundreds of thousands of dollars at an exceptionally low material cost.