refer to similar parts a pair of buffing machines 20 are shown in fig1 positioned within an archway 22 formed by a frame 24 of a printing press 26 a paper web 28 passes between opposed buffing rolls 30 which are mounted within vacuum hoods 32 which are connected to vacuum hoses 34 the buffing rolls 30 are rotated while air is drawn through the hoods 32 the rolls are rotated towards each other one in the clockwise direction and one in the counter clockwise direction in operation as shown in fig2 the buffing rolls 30 have a soft surface 36 composed of a profusion of radially extending wool fibers 37 which present a hairy surface the fibers 37 and the air currents create interact with the boundary layer of air moving with the paper web 28 causing lose paper fibers and dust containing various components such as clay starch or fiber particles to becoming entrained in the boundary layer attached to the buffing roll surface 36 the trapped particles are subsequently removed from the buffing roll 30 by a vacuum supplied by the hoses 34 to the vacuum hoods 32 as shown in fig2 the lightweight buffing roll 30 is constructed from a thin walled cylinder 38 with a hollow interior 40 in the case of a 3 u00bd inch diameter thin walled aluminum cylinder 38 has walls 42 which are approximately u215cth inches thick and is joined to two opposed stainless steel stub shafts 44 the stub shafts 44 are sweated to aluminum plugs 46 which are then welded or bonded to the inside diameter 48 of the cylinder 38 sweating refers to the process where one part is expanded by heating relative to another part and assembled so.