Cutting device and method for cross-cutting a moving fiber web

Abstract

A cutting device for perforating a running fibrous material web transversely to the web running direction has a first row of blades with a plurality of tips. A displacement device moves the row of blades with a motion component in the web running direction and a motion component perpendicular to the web running direction. Transverse separation by perforation and subsequent tearing is improved, particularly for heavy fibrous material webs (>250 g/mm2), by providing a second row of blades, which has a plurality of tips and which is also displaceable by a displacement device approximately simultaneously with the first row of blades. Cuts are made in the running fibrous web at a spacing distance between the cuts made by the first row of blades and the cuts made by the second row of blades in the web running direction of at least 1 mm, preferably at least 3 mm.

Dependencies are inferred from the claim text.