Less ink in circulation, fewer solvents, and automated setup operations. Swiss manufacturer Bobst is introducing a new version of its Master 6003 rotogravure press, designed for printing packaging. The changes primarily involve the inking system, cylinder cleaning, and consumption monitoring.
A Redesigned Inking Circuit
The main change involves the LeanPrint inking system. Bobst has redesigned the ink flow path between the reservoir and the ink pan, as well as the piping design.
This results in a 60% reduction in the volume of ink required for circulation compared to the previous configuration. The amount of ink exposed to air is also reduced, which could cut solvent consumption by up to 40%.
The positioning of the ink fountain relative to the cylinder has also been modified. According to the Swiss manufacturer, this adjustment allows for precise control without manual adjustment and ensures consistent ink transfer, even at high speeds.
Real-time consumption measurements
Another major new feature of the Master 6003 is its ink measurement system, which uses pressure sensors. On the control interface, the operator can view the amount of ink consumed for a job, the volume currently in circulation, the prepared ink supply, and an estimate of ink requirements until the end of the print run.
The gravure press also measures electricity and compressed air consumption in real time. This data makes it possible to identify any instances of excessive consumption and to document the resources used for each production run, particularly to meet customers? traceability requirements.
Cleaning the cylinders in one minute
Bobst also automates the pre-washing of engraved cylinders. Installed on every printing unit, this system removes dried ink from the cells without the need for manual cleaning. The cycles are triggered at the relevant stations and completed in one minute, according to the manufacturer.
The auxiliary cart has also been redesigned to make it easier to switch between jobs. The ink tanks can now be removed in either direction. Their placement at floor level reduces the amount of physical handling required.
A reference system also allows the cylinder to be positioned precisely according to the print pattern repeat, without requiring any additional manual steps during clamping.
"With the new Master 6003, we have focused on advancing proven rotogravure technology, with solutions that reduce consumption, automate routine operations, and improve visibility into production." , says Davide Rossello, head of R&D for rotogravure processes at Bobst. These changes are designed, in particular, to address the challenges faced by packaging printers, who are dealing with shorter print runs and the need to minimize downtime.
