Image Optimisation

Fujifilm has a range of technologies all designed to optimise print quality and overall system performance

Image optimisation technologies are designed to optimise print quality and overall system performance. Expert printhead and ink design results in perfect drop placement accuracy on the substrate, but there are often other technologies required to produce superb image quality.

Achieving high print quality at extreme speeds needs an understanding not just of ink, but the surface being printed. A combination of coating and software technologies can optimise quality and speed.

Screening

Fujifilm screening technologies determine the arrangement of dots on the substrate and are designed to create patterns that result in smooth colour tones, sharp images and fine details as well as eliminating moiré.

Pre-coating

In-line pre-coating technologies provide a chemically optimised surface in preparation for placement of the ink drops on the substrate, controlling how the drops interface with the surface and each other.

To counter the natural tendency of an ink droplet to spread when it hits the paper and ensure uniform ink formation whatever the paper type, the Jet Press 750S applies a Rapid Coagulation Primer (RCP) prior to ink deposition via an anilox roller. The RCP features a unique ‘rapid coagulation ink’ technology which prevents dot gain.

The formation of a perfect dot shape is the foundation of a high-quality image, and pre-coating technologies enable the very highest quality images to be reproduced on a wide variety of substrates.

Automatic nozzle control

Quality can be further enhanced through the use of a CCD sensor that makes any necessary alterations to the way the ink is discharged from the printhead in real-time.

The proprietary In-Line Sensor (ILS) system in the Jet Press 750S, for example, detects any nozzle and ink deposition inconsistencies, modifying the printhead nozzle map and ink deposition parameters in real-time to correct deviations from the norm.

Drying system

The way the ink is dried is also critical to the quality that can be achieved. For example, a completely new drying system was introduced in the Jet Press 750S to increase the efficiency of the drying process and achieve ultra-high quality at higher press speeds. In this new system, that requires 23% less power than in the Jet Press 720S, the printed sheet emerges from the imaging section of the press onto a transport belt heated via rollers, with a vacuum applied as the sheet passes through the drying section.

Drying is carried out via a combination of the heated belt and hot air applied from above. The vacuum applied to the transport belt ensures the sheet is dimensionally stable as the heat is applied, optimising the drying process. This new system can operate at higher speeds, and allows greater control and fine-tuning of temperatures, extending the range of substrates that can be printed.