Waste catchment system for rollers

A waste catchment system for a roller comprising an elongate tray, a blade assembly attached to, to extend the length of, the tray and including a blade located above the tray the free edge of which is adapted to engage with a roller to be cleaned whereby waste material from the roller is removed therefrom by the blade and is directed towards the tray, and a liner one edge of which is attached to the blade assembly whereby the liner lines the tray to receive therein the waste material, the blade assembly and the one edge of the liner being provided with co-operating male/female elements which are a friction pushfit one into the other to effect a releasable sealing connection therebetween, characterized by, between the liner and the tray, a removable, rigid support element the transverse section of which conforms substantially with that of the tray and the liner, the support element receiving therein the liner to facilitate removal of the liner from the tray.