Symphony 3 is the grooving machine for cardboard, equipped with 90° or 120° V-shaped blades, in addition to U-shaped blades. It is able to groo- ve the board in up to 4 different points without any dust, and it can also kiss-cut the cardboard. The equipment is used for the production of both hard covers and boxes. In this case indeed, Symphony 3 in its Symphony 3C version can remove also the cut-off corners of the board.
Video
https://www.youtube.com/watch?v=BaQzY2B9a1U