Rolls for single facer

Abstract

Elongated hollow members or tubes frictionally engage the interior wall of a hollow corrugating roll or a hollow pressure roll of a single facer so as to minimize the elastic vibration thereof and thereby to minimize the noise developed and transmitted during the operation of the single facer. A plurality of such tubes of a given diameter are arranged circumferentially about the interior wall of the shell of a roll of a single facer in such manner that each of the tubes frictionally engages the interior wall and so that each of the tubes also engages the adjacent tubes on either side thereof, thereby providing an assembled structure in which the plurality of tubes resist the elastic deformation of the roll and the resultant elastic vibratiion and thereby reduce the noise level. In a modified form of the invention, a second plurality of tubes of smaller diameter are arranged in similar fashion along a concentric circle radially inward of the first plurality of tubes, each of the second group of tubes being positioned in contact with two adjacent ones of the first group of tubes. A single centrally disposed tube may be positioned for further assisting in holding the assembled tubes in position. In other modified forms of the invention tubes of different diameters and wall thicknesses may be randomly arranged within the roll rather than being positioned in concentric circles of tubes of progressively decreasing diameter from the interior wall to the radially inmost position. In a further modification, annular members fixed to the interior wall of the roll may be provided at the ends of the tubes for further assisting in holding the tubes in position. Sound-deadening materials in solid or liquid form may be provided in some or all of the tubes or in the spaces between adjacent tubes.