The new Bobst K5 Vision is a vacuum metallizer for flexible packaging converters and CPP/PE film producers that can handle a wide variety of different film types – including heat-sensitive films and thin-gauge substrates. It can run at speeds up to 840m/min., is available in widths from 1,250mm to 2,450mm, and can house roll diameters up to 1,000mm. The K5 incorporates a Ø600mm coating drum “providing the largest coating window in the industry” that increases aluminum collection efficiency by up to 16% (resulting in less consumables, an extended boat life and a 10%-15% energy reduction).
It also provides better film cooling due to the increased surface area of the drum. Additional cooling is also achieved by its two-zone gas wedge, which provides better conduction of heat between the substrate and drum. Its evaporation source with a staggered ceramic boat arrangement provides excellent coating uniformity, said the OEM. The boats and aluminum spools are mounted on a removable trolley for easy changing, and its full-width-viewing windows give an improved view of the source and the entire metallization process. The K5 can handle a wide range of substrates including thin-gauge films, with quick changeovers of different film types.