hollow roll

hollow roll

A type of joint (between two sheets of metal roofing) in the direction of maximum slope of the roof; the two pieces are turned up at the joint and then bent to form a hollow cylindrical roll.
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References in periodicals archive ?
Tenders are invited for Hollow Rolls Under Primary Descaler
The Vollmer system consists of two hollow rolls, each fitted with multiple transducers along its length that measure tension differentials, which reflect shape, as the steel strip passes.