Abstract: According to an example aspect of the present invention, there is provided a collar (100) for compressing a sleeve on a drum (200), the collar (100) comprising: an inner part (110) configured to be attached to an end of the drum (200), an outer part (130), and a slip part (120) between the inner part (110) and the outer part (130), which slip part (120) is configured to be engaged with the sleeve, wherein the inner part (110), the slip part (120) and the outer part (130) are assembled together in succession along an assembly axis, and the slip part (120) is configured to translate between the inner part (110) and the outer part (130) along the assembly axis.

Abstract: According to an aspect of the present invention, there is provided a sleeve for a drum for use in forming, pressing or moulding a fibrous web, wherein the sleeve comprises at least two parts and each part has a form of an open-ended cylinder with two edges, configured to be arranged concentrically on the drum. At least one edge of each part has a peripheral locking form, and adjacent edges of adjacent parts have corresponding cooperating peripheral locking forms adapted to lock the parts to each other.