Urethane covered paper machine roll

A press roll for papermaking machinery which comprises a metal roll body covered with an integral layer of spray deposited impervious polyurethane resin containing small isolated pores throughout the thickness of the layer and having a ground stone-like paper web receiving peripheral surface with uncovered pores isolating small smooth areas surrounded by seams defined by the walls of the uncovered pores and facilitating release of paper from said peripheral surface.

A paper machine press roll comprising a steel roll body with a cylindrical surface, a spray deposited two-component solvent-free urethane resin impervious cylindrical cover surrounding said surface in bonded relation therewith and having a thickness of about 0.1 to 2 inches, said cover having a myriad of small isolated closed pores distributed throughout the thickness thereof, said pores having a diameter of about 0.019 to 0.185 millimeters, and a ground finished web-receiving peripheral surface on said cover having uncovered pores isolating a myriad of smooth areas surrounded by seams defined by the walls of the uncovered pores and facilitating release of paper from said peripheral surface, the pores beneath said peripheral surface remaining isolated and closed to maintain the imperviousness of the cover, and said cover having a shore hardness from about 60 on the A scale to 70 on the D scale.