(57) A corrugating unit (6) and method for a straw (1). The following are provided: at
least one seat (9), which is designed to house the straw (1); a conveyor (8), which
is configured to move the seat (9) carrying the straw (1) along a processing path
(P); a corrugating station (S3), which is arranged along the processing path (P) and
has a plurality of blades (12), which are all arranged parallel to the processing
path (P), and are mounted so as to remain, in use, still relative to the conveyor
(8) so that the seat (9), while moving along the processing path (P), causes the straw
(1) to come into contact with the blades (12), thus determining a deformation of the
straw (1) in the area of each blade (12); and a support arm (13), which supports all
the blades (12) and is mounted in a movable manner on the frame (7), so as to move
between a work position, in which the blades (12) are in the area of the processing
path (P), and a rest position, in which the blades (12) are far from the processing
path (P).
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