Apparatus and method for corrugating sheet material

摘要

An apparatus for corrugating a continuous sheet material such as paper or card comprises first and second members having toothed surfaces in meshing engagement such that a planar sheet material may be fed between the first and second surfaces and corrugated The teeth on the first and second members each comprise a top face 14 and opposing side faces 15, and edges where the side faces meet the top face. The teeth are preferably of half hexagonal form and provided on the periphery of a roller or on a belt. The degree of meshing between the teeth may be varied by moving the first member towards and away from the second member. Friction reduction may be provided by a coating or needle rollers provided on the members. Air may be delivered through apertures to provide an air cushion between the surfaces and the sheet material. Alternatively vacuum or steam may be similarly applied. Scoring blades or heaters may be provided on at least one of the members