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Up-close viewing of the 20SEVEN printing section after the demonstrations.
Up-close viewing of the 20SEVEN printing section after the demonstrations.
Photo: 12

The new 20SEVEN flexo press from BOBST is the company’s latest expression of its strategic commitment to deliver Extended Color Gamut (ECG) solutions for a variety of printing technologies and applications.

BOBST has been an advocate of the ECG concept since 2013 with the now well-established REVO 7-color Digital Flexo technology developed with leading industry suppliers for narrow and mid-web inline flexo presses.

In 2017, BOBST introduced the THQ FlexoCloud, a fixed color palette solution for corrugated board post print applications. The company is now tackling wide-web CI flexo printing with the 20SEVEN which offers features that have been specifically developed to deliver best results with ECG printing.

According to Dieter Betzmeier, R&D Director, Bobst Bielefeld, high quality imaging should be consistently repeatable run after run, at high speed, with both solvent-based and water-based inks. The ECG implementation system should be open for use with different printing plates, inks or industry suppliers. From a technical point of view, the company addressed the rigidity of the print deck, the ink flow, the drying and the stability of the register.

To achieve accuracy and consistency, the frame vibrations are eliminated by firmly and accurately locking the print decks’ bearings. The 20SEVEN’s bearing bolts are tightened using a pneumatic tool, which applies the same torque, thus avoiding the variables derived from manual operation by different operators. The bearings are precisely kept in place as a result of the triangular geometry of the BOBST triLOCK system. 

Ink is another factor that can have a major bearing on process consistency. The BOBST smartFLO system does away with the variables that can have an impact on the uniformity of ink consistency and flow. These include ink variations owing to environmental factors such as temperature and light, change of viscosity due to peaks in the flow from the ink bucket to the substrate and inconsistent ink metering as a result of the ink pumps.

The third fundamental aspect is press drying efficiency. The new FSM (Full Surface Matrix) dryer provides a significantly higher efficiency compared with one-slot drying systems as the blast of air is applied to the substrate over the whole surface of the dryer through hundreds of small jets. This not only guarantees drying at high production speeds, but also enhances register accuracy as the web is evenly pushed against the CI drum.

In terms of repeatability, the BOBST CI flexo presses rely on the smartGPS system. The BOBST offline registration and pressure setting system, in addition to its well-known performance in minimum waste at start up and job changeovers, is also instrumental in increasing the lifetime of high resolution plates by printing the real format, avoiding any distortion of dots.

A converting company with experience in implementing ECG printing is LitoPlas SA. Headquartered in Colombia, the company has an annual production capacity of 350million sqm of packaging.

Luis Mora, Director of Marketing & Innovation at LitoPlas shared the experience of having 50% of their production printed using ECG on two BOBST flexo presses at a recent BOBST Open House. “ECG makes printing a standardized industrial process, because it cannot afford to be a craft anymore,” he concluded.

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