Patent ID: 8118942

Claim:
A dust collection installation for equipment in which a continuous web is transported along its length and passes over a cylindrical roller, wherein said dust collection installation includes apparatus that comprises: (a) an elongate duct that extends in a direction transverse to a direction of movement of the web and that permits entry of air into the duct along the length thereof through at least one opening provided in the duct; and (b) air extracting means in fluid communication with the duct to draw air therefrom, and wherein: (c) said apparatus is positioned adjacent to a moving surface of the web so that said apparatus and the moving web surface define an air inlet and a space between the apparatus and the moving web surface into which air inlet and space is received at least a proportion of a layer of dust laden air adjacent to and moving with the moving web surface; (d) said air extracting means is operable to draw dust laden air from said space into the duct; and (e) said apparatus is positioned on the same side of the web as a roller which the web contacts and passes over and the or a said opening is so positioned that air flow into that opening is augmented by a jet of air generated where the moving web surface converges with and then comes into contact with a surface of the roller.